Method and device for transmitting and receiving sounding reference signal in communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate, and provides a method for transmitting a sounding reference signal (SRS) in a wireless communication system. The method may comprise the steps of: receiving a subband non-overlapping full duplex (SBFD) configuration and a sounding reference signal (SRS) configuration via higher-layer signaling; identifying an SRS resource on the basis of the SRS configuration; and transmitting an SRS in the identified SRS resource, wherein the SRS configuration includes a configuration for an SRS resource set for non-SBFD and a configuration for an SRS resource set for SBFD, the configuration for the SRS resource set for non-SBFD includes an information element (IE) for resource mapping corresponding to the SRS resource set for non-SBFD, and the configuration for the SRS resource set for SBFD includes an IE for resource mapping corresponding to the SRS resource set for SBFD.

Description

Method and device for transmitting and receiving sounding reference signals in a communication system

[0001] The present disclosure relates generally to wireless communication systems, and more specifically to methods and devices for transmitting and receiving a sounding reference signal (SRS) in a wireless communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] The present disclosure relates to SRS transmission and reception when supporting subband full duplex (or subband non-overlapping full duplex, SBFD).

[0009] For example, the present disclosure proposes a method in which, in relation to SRS transmission of a terminal when SBFD is supported, a base station sets an SRS resource based on SBFD, and the terminal performs SRS transmission in the set SRS resource.

[0010] In addition, the present disclosure describes various methods for cells / base stations and / or terminals supporting SBFD to extend the existing SRS configuration method by considering the time domain and / or frequency domain, i.e., various SRS configuration extension methods. For example, in the time domain, the basic time unit (e.g., slot, symbol) and in the frequency domain, the reference grid point of the basic resource are described.

[0011] The technical problems to be achieved in various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned can be considered by a person having ordinary skill in the art from various embodiments of the present disclosure described below.

[0012] A method performed by a terminal in a communication system according to one embodiment of the present disclosure may include the steps of: receiving a subband non-overlapping full duplex (SBFD) configuration and a sounding reference signal (SRS) configuration through upper layer signaling, wherein the SRS configuration includes a configuration for an SRS resource set for non-SBFD and a configuration for an SRS resource set for SBFD, wherein the configuration for the SRS resource set for non-SBFD includes an information element (IE) for resource mapping corresponding to the SRS resource set for non-SBFD, and wherein the configuration for the SRS resource set for SBFD includes an IE for resource mapping corresponding to the SRS resource set for SBFD; identifying an SRS resource based on the SRS configuration; and transmitting an SRS on the identified SRS resource.

[0013] According to one embodiment of the present disclosure, if the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the configuration for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: a period and a slot offset associated with the SRS resource are counted for an SBFD slot and a non-SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol and a non-SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol and a non-SBFD symbol within a slot; or a period and a slot offset associated with the SRS resource are counted for an SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol within a slot; And the number of repetitions associated with the above resource mapping can be identified based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot.

[0014] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to be periodic or semi-static, SBFD symbols constituting the SRS resource set for the SBFD may be allowed to be set beyond the SBFD boundary.

[0015] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD and the resource type of the configuration for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: can be identified based on whether an SRS offset indicator of downlink control information (DCI) that triggers transmission of the SRS is counted for an SBFD slot and a non-SBFD slot, or can be identified based on whether it is counted for an SBFD slot.

[0016] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, the SRS resource is identified based on a reference point grid and a frequency domain shift value corresponding to the SRS resource, and the reference point grid is aligned with a frequency resource unit having a smallest index among frequency resource units included in an SBFD subband, or is aligned with a frequency resource unit having a largest index among frequency resource units included in an SBFD subband, and the frequency resource unit may be a physical resource block (PRB) or a resource element (RE).

[0017] According to one embodiment of the present disclosure, a terminal of a communication system may be provided.

[0018] According to one embodiment of the present disclosure, the terminal includes a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive a subband non-overlapping full duplex (SBFD) configuration and a sounding reference signal (SRS) configuration through upper layer signaling, wherein the SRS configuration includes a configuration for an SRS resource set for non-SBFD and a configuration for an SRS resource set for SBFD, wherein the configuration for the SRS resource set for non-SBFD includes an information element (IE) for resource mapping corresponding to the SRS resource set for non-SBFD, and wherein the configuration for the SRS resource set for SBFD includes an IE for resource mapping corresponding to the SRS resource set for SBFD; identify an SRS resource based on the SRS configuration; and transmit an SRS on the identified SRS resource.

[0019] According to one embodiment of the present disclosure, if the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the configuration for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: a period and a slot offset associated with the SRS resource are counted for an SBFD slot and a non-SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol and a non-SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol and a non-SBFD symbol within a slot; or a period and a slot offset associated with the SRS resource are counted for an SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol within a slot; And the number of repetitions associated with the above resource mapping can be identified based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot.

[0020] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to be periodic or semi-static, SBFD symbols constituting the SRS resource set for the SBFD may be allowed to be set beyond the SBFD boundary.

[0021] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD and the resource type of the configuration for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: can be identified based on whether an SRS offset indicator of downlink control information (DCI) that triggers transmission of the SRS is counted for an SBFD slot and a non-SBFD slot, or can be identified based on whether it is counted for an SBFD slot.

[0022] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, the SRS resource is identified based on a reference point grid and a frequency domain shift value corresponding to the SRS resource, and the reference point grid is aligned with a frequency resource unit having a smallest index among frequency resource units included in an SBFD subband, or is aligned with a frequency resource unit having a largest index among frequency resource units included in an SBFD subband, and the frequency resource unit may be a physical resource block (PRB) or a resource element (RE).

[0023] A method performed by a base station in a communication system according to one embodiment of the present disclosure may include the steps of transmitting a subband non-overlapping full duplex (SBFD) configuration and a sounding reference signal (SRS) configuration through upper layer signaling, wherein the SRS configuration includes a configuration for an SRS resource set for non-SBFD and a configuration for an SRS resource set for SBFD, wherein the configuration for the SRS resource set for non-SBFD includes an information element (IE) for resource mapping corresponding to the SRS resource set for non-SBFD, and wherein the configuration for the SRS resource set for SBFD includes an IE for resource mapping corresponding to the SRS resource set for SBFD; and the step of transmitting an SRS in an SRS resource related to the SRS configuration.

[0024] According to one embodiment of the present disclosure, if the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the configuration for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: a period and a slot offset associated with the SRS resource are counted for an SBFD slot and a non-SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol and a non-SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol and a non-SBFD symbol within a slot; or a period and a slot offset associated with the SRS resource are counted for an SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol within a slot; And the number of repetitions associated with the above resource mapping may be based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot.

[0025] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to be periodic or semi-static, SBFD symbols constituting the SRS resource set for the SBFD may be allowed to be set beyond the SBFD boundary.

[0026] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the configuration for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: An SRS offset indicator of downlink control information (DCI) that triggers transmission of the SRS can be counted for an SBFD slot and a non-SBFD slot, or can be counted for an SBFD slot.

[0027] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, the SRS resource is based on a reference point grid and a frequency domain shift value corresponding to the SRS resource, and the reference point grid is aligned with a frequency resource unit having a smallest index among frequency resource units included in an SBFD subband, or is aligned with a frequency resource unit having a largest index among frequency resource units included in an SBFD subband, and the frequency resource unit may be a physical resource block (PRB) or a resource element (RE).

[0028] According to one embodiment of the present disclosure, a base station of a communication system may be provided.

[0029] According to one embodiment of the present disclosure, the base station includes a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: transmit a subband non-overlapping full duplex (SBFD) configuration and a sounding reference signal (SRS) configuration through upper layer signaling, wherein the SRS configuration includes a configuration for an SRS resource set for non-SBFD and a configuration for an SRS resource set for SBFD, wherein the configuration for the SRS resource set for non-SBFD includes an information element (IE) for resource mapping corresponding to the SRS resource set for non-SBFD, and wherein the configuration for the SRS resource set for SBFD includes an IE for resource mapping corresponding to the SRS resource set for SBFD; and transmit an SRS in an SRS resource associated with the SRS configuration.

[0030] According to one embodiment of the present disclosure, if the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the configuration for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: a period and a slot offset associated with the SRS resource are counted for an SBFD slot and a non-SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol and a non-SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol and a non-SBFD symbol within a slot; or a period and a slot offset associated with the SRS resource are counted for an SBFD slot, a number of symbols associated with the resource mapping are counted for an SBFD symbol within a slot, and a start position associated with the time domain of the SRS resource is counted for an SBFD symbol within a slot; And the number of repetitions associated with the above resource mapping may be based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot.

[0031] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to be periodic or semi-static, SBFD symbols constituting the SRS resource set for the SBFD may be allowed to be set beyond the SBFD boundary.

[0032] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the configuration for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: An SRS offset indicator of downlink control information (DCI) that triggers transmission of the SRS can be counted for an SBFD slot and a non-SBFD slot, or can be counted for an SBFD slot.

[0033] According to one embodiment of the present disclosure, when the SRS resource is included in the SRS resource set for the SBFD, the SRS resource is based on a reference point grid and a frequency domain shift value corresponding to the SRS resource, and the reference point grid is aligned with a frequency resource unit having a smallest index among frequency resource units included in an SBFD subband, or is aligned with a frequency resource unit having a largest index among frequency resource units included in an SBFD subband, and the frequency resource unit may be a physical resource block (PRB) or a resource element (RE).

[0034] The various embodiments of the present disclosure described above are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description to be described below.

[0035] According to one embodiment of the present disclosure, a method and device for transmitting and receiving SRS when supporting SBFD can be provided.

[0036] For example, the present disclosure may provide a method and apparatus for a base station to set an SBFD-based SRS resource and for a terminal to transmit an SRS from the set SRS resource in relation to SRS transmission of a terminal when SBFD is supported.

[0037] In addition, according to one embodiment of the present disclosure, a cell / base station and / or terminal supporting SBFD can provide various methods for extending the existing SRS configuration method by considering the time domain and / or the frequency domain, i.e., various SRS configuration extension methods. In particular, by specifying the basic time unit (e.g., slot, symbol) in the time domain and the reference grid point of the basic resource in the frequency domain, SRS can be transmitted and received based on low signaling overhead.

[0038] The effects that can be obtained from various embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by a person having ordinary skill in the art based on the detailed description below.

[0039] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0040] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0041] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0042] FIG. 4 is a diagram illustrating an example of setting a control region of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0043] FIG. 5A is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0044] FIG. 5B is a diagram illustrating a case in which a terminal can have multiple PDCCH monitoring positions within a slot through Span in a wireless communication system according to one embodiment of the present disclosure.

[0045] FIG. 6 is a diagram illustrating a structure in which SRS is allocated to each subband according to an embodiment of the present disclosure.

[0046] FIG. 7 is a diagram illustrating an uplink-downlink resource configuration of an XDD system that flexibly divides uplink and downlink resources into time domain and frequency domain according to one embodiment of the present disclosure.

[0047] FIG. 8 is a diagram illustrating an example of an uplink-downlink resource configuration of a full duplex communication system in which uplink and downlink resources are flexibly divided in the time domain and frequency domain, according to one embodiment of the present disclosure.

[0048] FIG. 9 is a diagram illustrating a transmission and reception structure for a duplex method according to one embodiment of the present disclosure.

[0049] Figure 10 is a diagram illustrating an example of downlink and uplink resource settings in an XDD system.

[0050] FIG. 11 is a diagram illustrating an example of SBFD operation in a TDD band of a wireless communication system to which the present disclosure is applied.

[0051] FIG. 12 is a diagram illustrating an SBFD setting according to one embodiment of the present disclosure.

[0052] FIG. 13 is a diagram illustrating an example of a non-SBFD symbol of a wireless communication system according to an embodiment of the present disclosure.

[0053] FIG. 14 is a diagram illustrating an example of an SBFD symbol of a wireless communication system according to one embodiment of the present disclosure.

[0054] FIG. 15 is a diagram illustrating an example of an SBFD symbol of a wireless communication system according to one embodiment of the present disclosure.

[0055] FIG. 16 is a diagram illustrating an example of an SBFD symbol of a wireless communication system according to one embodiment of the present disclosure.

[0056] FIG. 17 is a diagram illustrating an example of slots of a wireless communication system according to one embodiment of the present disclosure.

[0057] FIG. 18 is a diagram illustrating an example of slots of a wireless communication system according to one embodiment of the present disclosure.

[0058] FIG. 19A is a diagram illustrating an example of settings of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0059] FIG. 19B is a diagram showing an example of settings of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0060] FIG. 20 is a diagram showing an example of a configuration of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0061] FIG. 21 is a diagram showing an example of a configuration of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0062] FIG. 22A is a diagram illustrating an example of an operation for aperiodic SRS transmission in the time domain and frequency according to one embodiment of the present disclosure.

[0063] FIG. 22B is a diagram illustrating an example of an operation for aperiodic SRS transmission in the time domain and frequency according to one embodiment of the present disclosure.

[0064] FIG. 23 is a diagram illustrating the operation of a base station and an electronic device according to one embodiment of the present disclosure.

[0065] FIG. 24 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0066] FIG. 25 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0067] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0068] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to ensure that the gist of the present disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0069] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0070] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and these may vary depending on the intention or custom of the user or operator. Therefore, their definitions should be made based on the contents throughout the specification.

[0071] Hereinafter, the base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station.

[0072] Furthermore, while the embodiments of the present disclosure are described below using a 5G system as an example, the embodiments of the present disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. For example, this may include LTE or LTE-A mobile communication, and mobile communication technologies developed after 5G (6G). Accordingly, the embodiments of the present disclosure can be applied to other communication systems with some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as determined by a person skilled in the art. The contents of the present disclosure can be applied to FDD and TDD systems.

[0073] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0074] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0075] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0076] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0077] As a representative example of the above broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0078] As a future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0079] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must simultaneously provide the peak data rate and an increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz band.

[0080] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage due to the nature of the service, and thus may require broader coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and because frequent battery replacement is difficult, they may require extremely long battery lifespans, such as 10 to 15 years.

[0081] Finally, URLLC refers to cellular-based wireless communication services used for specific mission-critical purposes. Examples include remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts. Therefore, URLLC communications must offer extremely low latency and high reliability. For example, URLLC-enabled services must meet air interface latency requirements of less than 0.5 milliseconds and a packet error rate (PER) of 10-5 or lower. Therefore, for URLLC-enabled services, 5G systems must provide shorter Transmit Time Intervals (TTIs) than other services, while simultaneously allocating extensive resources in the frequency band to ensure communication link reliability.

[0082] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0083] [NR time-frequency resources]

[0084] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

[0085] The horizontal axis of Figure 1 represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE, 101), which can be defined as 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol (102) in the time axis and 1 subcarrier (103) in the frequency axis. In the frequency domain (For example, 12) consecutive REs can form one resource block (RB, 104).

[0086] Figure 2 is a diagram illustrating a slot structure considered in a 5G system.

[0087] Figure 2 illustrates an example of a structure of a frame (Frame, 200), a subframe (Subframe, 201), and a slot (Slot, 202). One frame (200) can be defined as 10 ms. One subframe (201) can be defined as 1 ms, and therefore one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( =14). 1 subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per 1 subframe (201) is a setting value for the subcarrier spacing. (204, 205) may vary. In the example of Fig. 2, the subcarrier spacing setting value is If =0(204) The case where =1(205) is shown. If =0(204), 1 subframe (201) can be composed of 1 slot (202), =1(205), 1 subframe (201) can be composed of 2 slots (203). That is, the setting value for the subcarrier spacing Number of slots per subframe according to ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Each subcarrier spacing setting According to and can be defined as [Table 1] below.

[0088] [Table 1]

[0089]

[0090] [Bandwidth Part (BWP)]

[0091] Next, the bandwidth part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0092] Figure 3 is a diagram illustrating an example of settings for the bandwidth portion in a 5G communication system.

[0093] Figure 3 shows an example in which the UE bandwidth (300) is set to two bandwidth portions, namely, bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station can set one or more bandwidth portions to the UE, and can set the information in [Table 2] for each bandwidth portion.

[0094] [Table 2]

[0095]

[0096] Of course, the above example is not limited, and in addition to the above configuration information, various parameters related to the bandwidth portion can be configured for the terminal. The above information can be transmitted from the base station to the terminal via upper layer signaling, for example, RRC (Radio Resource Control) signaling. At least one bandwidth portion among the configured one or more bandwidth portions can be activated. Whether or not the configured bandwidth portion is activated can be semi-statically transmitted from the base station to the terminal via RRC signaling or dynamically transmitted via DCI (Downlink Control Information).

[0097] According to some embodiments, a terminal before RRC (Radio Resource Control) connection can receive configuration information for an initial bandwidth portion (Initial BWP) for initial access from a base station through a Master Information Block (MIB). More specifically, the terminal can receive configuration information for a control region (Control Resource Set, CORESET) and a search space where a PDCCH for receiving system information (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)) required for initial access can be transmitted through the MIB during the initial access phase. The control region and search space configured by the MIB may each be regarded as identifier (ID) 0. The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control region #0 through the MIB. In addition, the base station can notify the terminal of configuration information for a monitoring cycle and occasion for control region #0, i.e., configuration information for search space #0, through the MIB. The terminal may consider the frequency range set as control area #0 obtained from the MIB as the initial bandwidth portion for initial connection. At this time, the identifier (ID) of the initial bandwidth portion may be considered as 0.

[0098] The settings for the bandwidth supported by the above 5G can be used for various purposes.

[0099] In some embodiments, when the bandwidth supported by a terminal is smaller than the system bandwidth, this can be supported through bandwidth portion configuration. For example, the base station can configure the bandwidth portion frequency location (configuration information 2) for the terminal, thereby allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.

[0100] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed, and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0101] Furthermore, in some embodiments, the base station may configure bandwidth portions with different bandwidth sizes for the terminal for the purpose of reducing power consumption of the terminal. For example, if the terminal supports a very large bandwidth, for example, 100 MHz, and constantly transmits and receives data using that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels using a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with a relatively small bandwidth, for example, 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0102] In the method for setting the bandwidth part, terminals before RRC connection (Connected) can receive setting information for the initial bandwidth part through the MIB (Master Information Block) in the initial access stage. More specifically, the terminal can set a control region (Control Resource Set, CORESET) for a downlink control channel on which DCI (Downlink Control Information) for scheduling a SIB (System Information Block) can be transmitted from the MIB of the PBCH (Physical Broadcast Channel). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth part, and the terminal can receive the PDSCH (Physical Downlink Shared Channel) on which the SIB is transmitted through the set initial bandwidth part. In addition to the purpose of receiving the SIB, the initial bandwidth part can also be utilized for other system information (Other System Information, OSI), paging, and random access.

[0103] [SS / PBCH block]

[0104] Next, we will explain the SS (Synchronization Signal) / PBCH block in 5G.

[0105] An SS / PBCH block may refer to a physical layer channel block consisting of a PSS (Primary SS), SSS (Secondary SS), and PBCH. Specifically, it is as follows.

[0106] - PSS: A signal that serves as a reference for downlink time / frequency synchronization and provides some information about the cell ID.

[0107] - SSS: It serves as a reference for downlink time / frequency synchronization and provides the remaining cell ID information not provided by PSS. Additionally, it can serve as a reference signal for PBCH demodulation.

[0108] - PBCH: Provides essential system information required for transmission and reception of data and control channels of a terminal. Essential system information may include search space-related control information indicating radio resource mapping information for the control channel, and scheduling control information for a separate data channel that transmits system information.

[0109] - SS / PBCH Block: An SS / PBCH block is composed of a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks can be transmitted within a 5ms period, and each transmitted SS / PBCH block can be distinguished by an index.

[0110] The terminal can detect PSS and SSS in the initial access stage, and decode PBCH. The terminal can obtain MIB from PBCH, and can set control region (Control Resource Set; CORESET) #0 (which may correspond to a control region with a control region index of 0) therefrom. The terminal can monitor control region #0, assuming that the selected SS / PBCH block and the DMRS (Demodulation Reference Signal) transmitted in control region #0 are QCL (Quasi Co Location). The terminal can receive system information through downlink control information transmitted in control region #0. The terminal can obtain RACH (Random Access Channel) related configuration information required for initial access from the received system information. The terminal can transmit PRACH (Physical RACH) to the base station considering the selected SS / PBCH index, and the base station receiving the PRACH can obtain information on the SS / PBCH block index selected by the terminal. The base station can know that the terminal has selected a block among each SS / PBCH block and monitors the control region #0 associated with it.

[0111] [PDCCH: DCI related]

[0112] Next, we will specifically explain downlink control information (DCI) in the 5G system.

[0113] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) is transmitted from a base station to a terminal via DCI. The terminal can monitor a DCI format for fallback and a DCI format for non-fallback for the PUSCH or PDSCH. The fallback DCI format can be composed of fixed fields defined between the base station and the terminal, and the non-fallback DCI format can include configurable fields.

[0114] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after going through the channel coding and modulation process. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly, but is included in the CRC calculation process. When the UE receives a DCI message transmitted on the PDCCH, it verifies the CRC using the assigned RNTI. If the CRC verification result is correct, the UE can determine that the message was transmitted to the UE.

[0115] For example, a DCI scheduling a PDSCH for System Information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a Paging message may be scrambled with P-RNTI. A DCI notifying a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

[0116] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI can include, for example, the information in Table 3.

[0117] [Table 3]

[0118]

[0119] DCI format 0_1 ​​can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI can include, for example, the information in Table 4.

[0120] [Table 4]

[0121]

[0122]

[0123] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI can include, for example, the information in Table 5.

[0124] [Table 5]

[0125]

[0126] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI can include, for example, the information in Table 6.

[0127] [Table 6]

[0128]

[0129] [PDCCH: CORESET, REG, CCE, Search Space]

[0130] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0131] FIG. 4 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system.

[0132] FIG. 4 illustrates an example in which two control regions (Control Region #1 (401), Control Region #2 (402)) are set within a UE bandwidth part (410) in the frequency axis and within one slot (420) in the time axis. The control regions (401, 402) can be set to specific frequency resources (403) within the entire UE bandwidth part (410) in the frequency axis. The time axis can be set to one or more OFDM symbols, which can be defined as the control region length (Control Resource Set Duration, 404). Referring to the example illustrated in FIG. 4, Control Region #1 (401) is set to a control region length of two symbols, and Control Region #2 (402) is set to a control region length of one symbol.

[0133] In the aforementioned 5G, the control region can be established by the base station to the terminal via higher-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Establishing a control region for the terminal means providing information such as the control region identifier, the frequency location of the control region, and the symbol length of the control region. For example, this information may include the information in Table 7.

[0134] [Table 7]

[0135]

[0136] In Table 7, the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with the DMRS transmitted in the corresponding control region.

[0137] FIG. 5A is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G.

[0138] Referring to FIG. 5A, the basic unit of time and frequency resources constituting the control channel can be referred to as a REG (Resource Element Group, 503), and the REG (503) can be defined as 1 OFDM symbol (501) on the time axis and 1 PRB (Physical Resource Block, 502) on the frequency axis, i.e., 12 subcarriers. The base station can concatenate REGs (503) to configure a downlink control channel allocation unit.

[0139] As illustrated in FIG. 5A, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 504), 1 CCE (504) can be composed of multiple REGs (503). Taking the REG (503) illustrated in FIG. 5A as an example, the REG (503) can be composed of 12 REs, and if 1 CCE (504) is composed of 6 REGs (503), 1 CCE (504) can be composed of 72 REs. When a downlink control region is established, the region can be composed of multiple CCEs (504), and a specific downlink control channel can be mapped to one or multiple CCEs (504) and transmitted according to the aggregation level (AL) within the control region. CCEs (504) within the control area are distinguished by numbers, and the numbers of the CCEs (504) can be assigned according to a logical mapping method.

[0140] The basic unit of the downlink control channel illustrated in FIG. 5A, that is, the REG (503), may include both the REs to which the DCI is mapped and the areas to which the DMRS (505), which is a reference signal for decoding the REs, is mapped. As in FIG. 5A, three DMRSs (505) may be transmitted within one REG (503). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL = L, one downlink control channel may be transmitted through L CCEs. The terminal must detect a signal without knowing information about the downlink control channel, and a search space representing a set of CCEs is defined for blind decoding. A search space is a set of downlink control channel candidates (CCEs) that a terminal must attempt to decode at a given aggregation level. Since there are multiple aggregation levels, each of which can be a set of 1, 2, 4, 8, or 16 CCEs, a terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all configured aggregation levels.

[0141] Search spaces can be categorized into common search spaces and UE-specific search spaces. A certain group of UEs, or all UEs, can search the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling of system information or paging messages. For example, PDSCH scheduling allocation information for transmitting SIBs, including cell operator information, can be received by searching the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs, or all UEs, must receive the PDCCH, it can be defined as a set of pre-arranged CCEs. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by searching the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE's identity and various system parameters.

[0142] In 5G, parameters for the search space for PDCCH can be configured from the base station to the terminal through higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the control region index to be monitored for the search space, etc. to the terminal. For example, the information in Table 8 can be included.

[0143] [Table 8]

[0144]

[0145]

[0146] Depending on the configuration information, the base station may configure one or more search space sets for the terminal. In some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, and may configure the terminal to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and may configure the terminal to monitor DCI format B scrambled with Y-RNTI in search space set 2 in a terminal-specific search space.

[0147] According to the configuration information, one or more search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as a common search space, and search space set #3 and search space set #4 may be configured as terminal-specific search spaces.

[0148] In the common search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these.

[0149] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0150] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0151] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0152] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0153] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0154] In a terminal-specific search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these examples.

[0155] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0156] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0157] The RNTIs specified may follow the definitions and uses below.

[0158] C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0159] TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0160] CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0161] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0162] P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0163] SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0164] INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0165] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0166] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0167] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0168] The aforementioned specified DCI formats may follow the definitions below.

[0169] [Table 9]

[0170]

[0171] In 5G, the search space of aggregation level L in the control region p and search space set s can be expressed as in [Mathematical Formula 1] below.

[0172] [Mathematical Formula 1]

[0173]

[0174] - L: Integration level

[0175] - : Carrier Index

[0176] - : Total number of CCEs existing within the control region p

[0177] - : slot index

[0178] - : Number of PDCCH candidates for aggregation level L

[0179] - : PDCCH candidate index of aggregation level L

[0180] -

[0181] -

[0182] - I: Terminal identifier

[0183] The value can be 0 for a common search space.

[0184] In the case of a terminal-specific search space, the value may correspond to a value that changes depending on the terminal's identity (C-RNTI or ID set to the terminal by the base station) and the time index.

[0185] In 5G, since multiple search space sets can be configured with different parameters (e.g., parameters in [Table 8]), the set of search space sets monitored by a terminal at each point in time can be different. For example, if search space set #1 is configured with an X-slot period and search space set #2 is configured with a Y-slot period and X and Y are different, the terminal can monitor both search space set #1 and search space set #2 in a specific slot, or monitor either search space set #1 or search space set #2 in a specific slot.

[0186] When a terminal has multiple PDCCH monitoring positions within a slot, it can perform a terminal capability report for each subcarrier interval, and at this time, the concept of Span can be used. A Span refers to consecutive symbols within a slot in which the terminal can monitor a PDCCH, and each PDCCH monitoring position is within one Span. A Span can be expressed as (X, Y), where x refers to the minimum number of symbols that must be spaced between the first symbols of two consecutive Spans, and Y refers to the number of consecutive symbols in which the PDCCH can be monitored within one Span. In this case, the terminal can monitor the PDCCH in the section from the first symbol of the Span to Y symbols within the Span.

[0187] FIG. 5B is a diagram illustrating a case in which a terminal in a wireless communication system can have multiple PDCCH monitoring positions within a slot through Span.

[0188] Span can be (X,Y) = (7,4), (4,3), (2,2), and each of these three cases is represented by (5b-00), (5b-05), and (5b-10) in FIG. 5B. For example, (5b-00) represents a case where there are two Spans that can be expressed as (7,4) within a slot. The interval between the first symbols of the two Spans is represented as X=7, and the PDCCH monitoring positions can exist within a total of Y=3 symbols from the first symbol of each Span, and search spaces 1 and 2 each exist within Y=3 symbols. As another example, (5b-05) represents a case where there are three Spans that can be expressed as (4,3) within a slot, and the interval between the second and third Spans is X'=5 symbols, which is larger than X=4.

[0189] [PUSCH: Transmission method related]

[0190] Next, we describe the scheduling method for PUSCH transmission. PUSCH transmission can be dynamically scheduled by the UL grant within the DCI or can operate by configured grant Type 1 or Type 2. Dynamic scheduling instructions for PUSCH transmission are possible in DCI format 0_0 or 0_1.

[0191] Configured grant Type 1 PUSCH transmission can be semi-statically configured by receiving configuredGrantConfig including rrc-ConfiguredUplinkGrant of [Table 10] through higher-level signaling, without receiving UL grant in DCI. Configured grant Type 2 PUSCH transmission can be semi-persistently scheduled by UL grant in DCI after receiving configuredGrantConfig not including rrc-ConfiguredUplinkGrant of [Table 10] through higher-level signaling. When PUSCH transmission operates by configured grant, parameters applied to PUSCH transmission are applied through configuredGrantConfig of higher-level signaling of [Table 10], except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by pusch-Config of [Table 11]. If the terminal has been provided with transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 10], the terminal applies tp-pi2BPSK in pusch-Config of [Table 11] to PUSCH transmission operated by the configured grant.

[0192] [Table 10]

[0193]

[0194]

[0195] Next, the PUSCH transmission method is described.

[0196] The DMRS antenna port for PUSCH transmission is the same as the antenna port for SRS transmission. PUSCH transmission can follow either a codebook-based or non-codebook-based transmission method, depending on whether the value of txConfig in the upper signaling, pusch-Config in [Table 11], is 'codebook' or 'nonCodebook'.

[0197] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically configured by configured grant. If the UE is instructed to schedule PUSCH transmission via DCI format 0_0, the UE performs beam configuration for PUSCH transmission using pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the activated uplink BWP within the serving cell, and the PUSCH transmission is based on a single antenna port. The UE does not expect scheduling for PUSCH transmission via DCI format 0_0 within a BWP where a PUCCH resource including pucch-spatialRelationInfo is not configured. If the UE does not configure txConfig in pusch-Config of [Table 11], the UE does not expect to be scheduled with DCI format 0_1.

[0198] [Table 11]

[0199]

[0200]

[0201] Next, we describe codebook-based PUSCH transmission.

[0202] Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, or can operate semi-statically based on a configured grant. When codebook-based PUSCH is dynamically scheduled via DCI format 0_1 ​​or semi-statically configured via a configured grant, the UE determines a precoder for PUSCH transmission based on the SRS Resource Indicator (SRI), the Transmission Precoding Matrix Indicator (TPMI), and the transmission rank (the number of PUSCH transmission layers).

[0203] At this time, the SRI can be given through the SRS resource indicator field in the DCI or configured through the srs-ResourceIndicator higher-level signaling. The UE is configured with at least one SRS resource when transmitting a codebook-based PUSCH, and can be configured with up to two. When the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. In addition, the TPMI and transmission rank can be given through the precoding information and number of layers fields in the DCI or configured through the precodingAndNumberOfLayers higher-level signaling. The TPMI is used to indicate the precoder applied to the PUSCH transmission. If the UE is configured with one SRS resource, the TPMI is used to indicate the precoder to be applied to the configured one SRS resource. When a terminal is configured with multiple SRS resources, TPMI is used to indicate the precoder to be applied in the SRS resource indicated through SRI.

[0204] The precoder to be used for PUSCH transmission is selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in the upper layer signaling, SRS-Config. In codebook-based PUSCH transmission, the UE determines the codebook subset based on the TPMI and codebookSubset in the upper layer signaling, pusch-Config. The codebookSubset in the upper layer signaling, pusch-Config, can be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the UE to the base station. If the UE reported 'partialAndNonCoherent' as the UE capability, the UE does not expect the value of codebookSubset in the upper layer signaling to be set to 'fullyAndPartialAndNonCoherent'. Additionally, if the UE reports 'nonCoherent' as the UE capability, the UE does not expect the value of the upper signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. If nrofSRS-Ports in the upper signaling SRS-ResourceSet points to two SRS antenna ports, the UE does not expect the value of the upper signaling codebookSubset to be set to 'partialAndNonCoherent'.

[0205] The terminal can be configured with one SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource in the SRS resource set can be indicated via SRI. If multiple SRS resources are configured in the SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal expects that the value of nrofSRS-Ports in the upper signaling SRS-Resource is set to the same value for all SRS resources.

[0206] The terminal transmits to the base station one or more SRS resources included in the SRS resource set in which the usage value is set to 'codebook' according to upper signaling, and the base station selects one of the SRS resources transmitted by the terminal and instructs the terminal to perform PUSCH transmission using transmission beam information of the corresponding SRS resource. At this time, in codebook-based PUSCH transmission, the SRI is used as information for selecting an index of one SRS resource and is included in the DCI. Additionally, the base station includes in the DCI information indicating the TPMI and rank to be used by the terminal for PUSCH transmission. The terminal performs PUSCH transmission by applying the indicated rank and the precoder indicated by the TPMI based on the transmission beam of the corresponding SRS resource using the SRS resource indicated by the SRI.

[0207] Next, we describe non-codebook-based PUSCH transmission. Non-codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can operate semi-statically based on a configured grant. If at least one SRS resource is configured within an SRS resource set in which the usage value in the upper signaling, SRS-ResourceSet, is set to 'nonCodebook', the UE can be scheduled for non-codebook-based PUSCH transmission via DCI format 0_1.

[0208] For an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can be configured with one connected NZP CSI-RS resource (non-zero power CSI-RS). The UE can perform calculations for a precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the aperiodic SRS transmission at the UE is less than 42 symbols, the UE does not expect information about the precoder for SRS transmission to be updated.

[0209] If the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the connected NZP CSI-RS is indicated by the SRS request field in DCI format 0_1 ​​or 1_1. At this time, if the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the presence of the connected NZP CSI-RS is indicated when the value of the SRS request field in DCI format 0_1 ​​or 1_1 is not '00'. At this time, the DCI must not indicate cross-carrier or cross BWP scheduling. In addition, if the value of the SRS request indicates the presence of an NZP CSI-RS, the NZP CSI-RS is located in the slot in which the PDCCH including the SRS request field is transmitted. At this time, the TCI states set for the scheduled subcarriers are not set to QCL-TypeD.

[0210] If a periodic or semi-persistent SRS resource set is configured, the associated NZP CSI-RS can be indicated through the associatedCSI-RS within the upper-level signaling SRS-ResourceSet. For non-codebook-based transmission, the UE does not expect the upper-level signaling spatialRelationInfo for the SRS resource and the associatedCSI-RS within the upper-level signaling SRS-ResourceSet to be configured together.

[0211] When multiple SRS resources are configured, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. At this time, the SRI can be indicated through the SRS resource indicator field in the DCI or can be set through the srs-ResourceIndicator, which is a higher-level signaling. Similar to the codebook-based PUSCH transmission described above, when the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability reported by the UE to the base station. At this time, the SRS resources that the UE simultaneously transmits occupy the same RB. The UE configures one SRS port for each SRS resource. Only one SRS resource set with the usage value set to 'nonCodebook' in the upper signaling SRS-ResourceSet can be set, and up to four SRS resources for non-codebook based PUSCH transmission can be set.

[0212] The base station transmits one NZP-CSI-RS associated with an SRS resource set to the terminal, and the terminal calculates a precoder to be used when transmitting one or more SRS resources within the SRS resource set based on the result measured upon reception of the NZP-CSI-RS. When the terminal transmits one or more SRS resources within the SRS resource set with usage set to 'nonCodebook' to the base station, the terminal applies the calculated precoder, and the base station selects one or more SRS resources from the received one or more SRS resources. At this time, in non-codebook based PUSCH transmission, the SRI represents an index that can express a combination of one or more SRS resources, and the SRI is included in the DCI. At this time, the number of SRS resources indicated by the SRI transmitted by the base station can be the number of transmission layers of the PUSCH, and the terminal transmits the PUSCH by applying the precoder applied to SRS resource transmission to each layer.

[0213] [SRS related]

[0214] Next, we describe an uplink channel estimation method using the Sounding Reference Signal (SRS) transmission of a terminal. The base station can configure at least one SRS configuration for each uplink BWP to convey configuration information for SRS transmission to the terminal, and can also configure at least one SRS resource set for each SRS configuration. For example, the base station and the terminal can transmit and receive the following upper-level signaling information to convey information regarding the SRS resource set.

[0215] - srs-ResourceSetId: SRS resource set index

[0216] - srs-ResourceIdList: A set of SRS resource indices referenced in the SRS resource set.

[0217] - resourceType: This is the time axis transmission setting of the SRS resource referenced in the SRS resource set, and can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. If resourceType is set to 'periodic' or 'semi-persistent', associated CSI-RS information can be provided depending on the usage of the SRS resource set. If resourceType is set to 'aperiodic', an aperiodic SRS resource trigger list and slot offset information can be provided, and associated CSI-RS information can be provided depending on the usage of the SRS resource set.

[0218] - usage: This is a setting for the usage of the SRS resource referenced in the SRS resource set, and can be set to one of 'beamManagement', 'codebook', 'nonCodebook', and 'antennaSwitching'.

[0219] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmission power of the SRS resource referenced in the SRS resource set.

[0220] The terminal can understand that the SRS resource included in the set of SRS resource indices referenced in the SRS resource set follows the information set in the SRS resource set.

[0221] In addition, the base station and the terminal can transmit and receive upper layer signaling information to convey individual configuration information for the SRS resource. For example, the individual configuration information for the SRS resource can include time-frequency axis mapping information within the slot of the SRS resource, which can include information about frequency hopping within or between slots of the SRS resource. In addition, the individual configuration information for the SRS resource can include the time axis transmission configuration of the SRS resource, which can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This can be restricted to have the same time axis transmission configuration as the SRS resource set including the SRS resource. If the time axis transmission configuration of the SRS resource is set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (e.g., periodicityAndOffset) can additionally be included in the time axis transmission configuration.

[0222] The base station can activate, deactivate, or trigger SRS transmission to the UE through higher layer signaling, including RRC signaling or MAC (medium access control) CE (control element) signaling, or L1 signaling (e.g., DCI). For example, the base station can activate or deactivate periodic SRS transmission to the UE through higher layer signaling. The base station can instruct the UE to activate an SRS resource set whose resourceType is set to periodic through higher layer signaling, and the UE can transmit SRS through the SRS resource referenced in the activated SRS resource set. The time-frequency axis resource mapping within the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource, and the slot mapping, including the transmission period and slot offset, follows periodicityAndOffset set in the SRS resource. Additionally, the spatial domain transmission filter applied to the transmitted SRS resource may refer to the spatial relation information set in the SRS resource, or may refer to the associated CSI-RS information set in the SRS resource set that includes the SRS resource. The terminal may transmit the SRS resource within the activated uplink BWP for the periodic SRS resource activated through upper layer signaling.

[0223] For example, a base station can activate or deactivate semi-persistent SRS transmission to a terminal through upper layer signaling. The base station can instruct the terminal to activate an SRS resource set through MAC CE signaling, and the terminal can transmit an SRS resource referenced in the activated SRS resource set. The SRS resource set activated through MAC CE signaling can be limited to an SRS resource set with resourceType set to semi-persistent. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource, and the slot mapping including the transmission period and slot offset follows the periodicityAndOffset configured in the SRS resource. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information configured in the SRS resource, or the associated CSI-RS information configured in the SRS resource set that includes the SRS resource. If spatial relation info is configured in an SRS resource, the spatial domain transmission filter can be determined by referring to the configuration information for spatial relation info transmitted through MAC CE signaling that activates semi-persistent SRS transmission without following it. The terminal can transmit SRS resources within the activated uplink BWP for the semi-persistent SRS resource activated through upper layer signaling.

[0224] For example, a base station can trigger aperiodic SRS transmission to a terminal via DCI. The base station can indicate one of the aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) via the SRS request field of the DCI. The terminal can understand that an SRS resource set including the aperiodic SRS resource trigger indicated via DCI in the aperiodic SRS resource trigger list among the configuration information of the SRS resource set has been triggered. The terminal can transmit an SRS resource referenced in the triggered SRS resource set. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource. In addition, the slot mapping of the transmitted SRS resource can be determined through a slot offset between a PDCCH including the DCI and the SRS resource, which can refer to value(s) included in a slot offset set configured in the SRS resource set. Specifically, the slot offset between the PDCCH including DCI and the SRS resource can be applied by applying the value indicated in the time domain resource assignment field of the DCI among the offset value(s) included in the slot offset set configured in the SRS resource set. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information configured in the SRS resource, or can refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The UE can transmit the SRS resource within the activated uplink BWP for the aperiodic SRS resource triggered through the DCI.

[0225] When a base station triggers aperiodic SRS transmission to a terminal through DCI, a minimum time interval may be required between a PDCCH including the DCI that triggers aperiodic SRS transmission and the SRS to be transmitted, so that the terminal can transmit the SRS by applying configuration information for the SRS resource. The time interval for SRS transmission of the terminal can be defined as the number of symbols between the last symbol of the PDCCH including the DCI that triggers aperiodic SRS transmission and the first symbol to which the first SRS resource to be transmitted among the SRS resource(s) is mapped. The minimum time interval can be determined with reference to the PUSCH preparation procedure time required for the terminal to prepare for PUSCH transmission. In addition, the minimum time interval can have different values ​​depending on the usage of the SRS resource set including the SRS resource to be transmitted. For example, the minimum time interval can be determined as N2 symbols, which are defined by considering the terminal processing ability according to the capability of the terminal with reference to the PUSCH preparation procedure time of the terminal. In addition, considering the usage of the SRS resource set including the SRS resource being transmitted, if the usage of the SRS resource set is set to 'codebook' or 'antennaSwitching', the minimum time interval can be set to N2 symbols, and if the usage of the SRS resource set is set to 'nonCodebook' or 'beamManagement', the minimum time interval can be set to N2+14 symbols.The terminal may transmit an aperiodic SRS if the time interval for aperiodic SRS transmission is greater than or equal to the minimum time interval, and may ignore the DCI that triggers the aperiodic SRS if the time interval for aperiodic SRS transmission is less than the minimum time interval.

[0226] [Table 12]

[0227]

[0228]

[0229] The spatialRelationInfo setting information in Table 12 above refers to a single reference signal and applies the beam information of the reference signal to the beam used for the corresponding SRS transmission. For example, the spatialRelationInfo setting may include information as shown in Table 13 below.

[0230] [Table 13]

[0231]

[0232] Referring to the above spatialRelationInfo setting, the index of the reference signal to be referenced in order to use the beam information of a specific reference signal, i.e., the SS / PBCH block index, CSI-RS index, or SRS index can be set. The upper signaling referenceSignal is setting information indicating which beam information of which reference signal is to be referenced for the corresponding SRS transmission, ssb-Index means the index of the SS / PBCH block, csi-RS-Index means the index of the CSI-RS, and srs means the index of the SRS, respectively. If the value of the upper signaling referenceSignal is set to 'ssb-Index', the terminal can apply the reception beam used when receiving the SS / PBCH block corresponding to the ssb-Index as the transmission beam of the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'csi-RS-Index', the terminal can apply the reception beam used when receiving the CSI-RS corresponding to the csi-RS-Index as the transmission beam of the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'srs', the terminal can apply the transmission beam used when transmitting the SRS corresponding to the srs as the transmission beam for the corresponding SRS transmission.

[0233] [SRS antenna switching related]

[0234] Below, SRS for antenna switching is described.

[0235] SRS can be used to acquire DL (downlink) CSI (Channel State Information) information (e.g., DL CSI acquisition). As a specific example, in a single-cell or multi-cell (e.g., carrier aggregation (CA)) situation based on TDD (Time Division Duplex), after a BS (Base Station) schedules SRS transmission to a UE (User Equipment), the BS can measure the SRS transmitted from the UE. In this case, assuming DL / UL reciprocity, the BS can schedule DL signals / channels to the UE based on the measurement by SRS. In this case, with respect to DL CSI acquisition based on SRS, the usage of the SRS resource referenced in the SRS resource set can be set to antenna switching.

[0236] For example, according to the standard (e.g., 3gpp TS38.214), the usage of SRS can be set to the base station and / or terminal using a higher layer parameter (e.g., usage of RRC parameter SRS-ResourceSet). Here, the usage of SRS can be set to beam management usage, codebook transmission usage, non-codebook transmission usage, antenna switching usage, etc.

[0237] Below, we will specifically examine the case where SRS transmission (i.e., transmission of SRS resources or a set of SRS resources) is set for antenna switching purposes among the above purposes.

[0238] For example, for a terminal with partial reciprocity, SRS transmission based on antenna switching (i.e., transmit antenna switching) may be supported to acquire DL CSI through SRS transmission in situations such as TDD. When antenna switching is applied, the interval between SRS resources (and / or the resources between SRS resources and PUSCH / PUCCH) for antenna switching of the terminal may typically be approximately 15 μs. Taking this into account, a (minimum) guard period as shown in Table 14 may be defined.

[0239] Table 14 shows the minimum protection intervals according to numerology.

[0240] [Table 14]

[0241]

[0242] In Table 14, μ represents numerology, Δf represents subcarrier spacing, and Y represents the number of symbols in the guard interval, i.e., the length of the guard interval. Referring to Table 14, the guard interval can be set based on the parameter μ that determines the numerology. In the guard interval, the terminal is set not to transmit any other signals, and the guard interval can be set to be used entirely for antenna switching. For example, the guard interval can be set considering SRS resources transmitted in the same slot. In particular, when the terminal is set and / or instructed to transmit an aperiodic SRS configured with intra-slot antenna switching, the terminal transmits the SRS using a different transmit antenna for each designated SRS resource, and the above-described guard interval can be set between each resource.

[0243] In addition, as described above, when the terminal is configured with SRS resources and / or SRS resource sets for antenna switching purposes through upper layer signaling, the terminal may be configured to perform SRS transmission based on UE capability related to antenna switching. The terminal may report capability information indicating whether or not it supports SRS antenna switching to the base station. The capability information may include a parameter indicating an SRS transmission port switching pattern supported by the terminal. Here, the capability of the terminal related to antenna switching reported by the parameter may be '1T2R', '2T4R', '1T4R', '1T4R / 2T4R', '1T1R', '2T2R', '4T4R', etc. Here, 'xTyR' may mean a terminal capability indicating that SRS transmission is possible on x antenna ports over y receiving antennas.

[0244] For example, for a terminal supporting 1T2R, up to two SRS resource sets can be configured with different values ​​for the resourceType of the upper layer parameter SRS-ResourceSet. Here, each SRS resource set can have two SRS resources transmitted in different symbols, and each SRS resource in a given SRS resource set can configure a single SRS port. In addition, the SRS port for the second SRS resource in an SRS resource set can be configured to be associated with a different terminal antenna port than the SRS port for the first SRS resource in the same SRS resource set.

[0245] For another example, for a terminal supporting 2T4R, up to two SRS resource sets may be configured with different values ​​for the resourceType of the upper layer parameter SRS-ResourceSet. Here, each SRS resource set may have two SRS resources transmitted in different symbols, and each SRS resource in a given SRS resource set may configure two SRS ports. In addition, the SRS port pair for the second SRS resource in an SRS resource set may be configured to be associated with a different terminal antenna port than the SRS port pair for the first SRS resource in the same SRS resource set.

[0246] For another example, for a terminal supporting 1T4R, SRS resource sets may be configured in different ways depending on whether SRS transmission is configured to be periodic, semi-persistent, and / or aperiodic. First, if SRS transmission is configured to be periodic or semi-persistent, 0 or 1 SRS resource set configured based on the resourceType of the upper layer parameter SRS-ResourceSet may be configured with 4 SRS resources transmitted in different symbols. Here, each SRS resource in the given SRS resource set may configure a single SRS port. In addition, the SRS port for each SRS resource may be configured to be associated with different terminal antenna ports. In contrast, when SRS transmission is configured aperiodic, zero or two SRS resource sets configured based on the resourceType of the upper layer parameter SRS-ResourceSet can be configured with a total of four SRS resources transmitted in different symbols of two different slots. Here, the SRS port for each SRS resource in the given two SRS resource sets can be configured to be associated with different terminal antenna ports. Each SRS resource set can be configured with two SRS resources, or one SRS resource set can be configured with one SRS resource and the other SRS resource sets can be configured with three SRS resources.

[0247] For another example, for a terminal supporting 1T1R, 2T2R, or 4T4R, up to two SRS resource sets, each consisting of one SRS resource, may be configured for SRS transmission. The number of SRS ports of each SRS resource may be set to 1, 2, or 4.

[0248] If the indicated terminal capability is 1T4R / 2T4R, the terminal may expect the same number of SRS ports (e.g., 1 or 2) to be configured for all SRS resources in the SRS resource set(s). In addition, if the indicated terminal capability is 1T2R, 2T4R, 1T4R, or 1T4R / 2T4R, the terminal may not expect one or more SRS resource sets configured for antenna switching purposes in the same slot to be configured or triggered. In addition, even if the indicated terminal capability is 1T1R, 2T2R, or 4T4R, the terminal may not expect one or more SRS resource sets configured for antenna switching purposes in the same slot to be configured or triggered.

[0249] The various embodiments described above have been described without explicitly configuring panels for uplink and downlink transmission for the terminal. That is, the terminal antenna port for SRS antenna switching can be configured without explicit consideration of the terminal panel, and the base station and the terminal can operate accordingly. If at least two or more panels are explicitly configured, SRS resource set(s) for antenna switching purposes can be configured for each panel. In this case, UE capability may exist depending on whether the terminal can simultaneously transmit the corresponding SRS resource set(s) configured for each panel, whether they can be configured in the same slot, or whether they can be transmitted in the same slot.

[0250] [SRS comb offset / cyclic shift settings]

[0251] Next, we describe how to set comb offset and cyclic shift when transmitting the Sounding Reference Signal (SRS) of the terminal.

[0252] A terminal can receive SRS resources from a base station through upper layer signaling, such as SRS-Resource or SRS-PosResource. An SRS resource can consist of the following:

[0253] - The terminal can set the number of antenna ports for each SRS resource, and the value is It can be defined as and can be set through nrofSRS-Ports or nrofSRS-Ports-n8 included in the SRS resource. If the usage included in the SRS-ResourceSet is set to a value other than nonCodebook, can mean the number of the i-th antenna port, and i is 0 to can be an integer. If the usage included in the SRS-ResourceSet is set to nonCodebook, each SRS resource The antenna ports of the i+1th SRS resource in the SRS-ResourceSet can be set. can be defined as SRS-PosResource. can be defined as

[0254] - The terminal can be configured for the number of consecutive symbols in which the SRS is transmitted through nrofSymbols in the resourceMapping included in the SRS resource from the base station, and the value is can be defined as

[0255] - The terminal can be configured for the position of the start symbol where the SRS is transmitted within a slot through the startPosition in the resourceMapping included in the SRS resource from the base station, and the value is can be defined as . At this time, can mean the number of symbols in the slot, and its value can be 14 for the normal cyclic prefix or 12 for the extended cyclic prefix. can mean an offset value that counts the number of symbols backwards from the symbol located at the very end of the slot. At this time, can satisfy.

[0256] - may mean the starting position of the frequency resource where the SRS is transmitted.

[0257] An SRS sequence that can be generated through an SRS resource defined based on the above information can be defined as in [Mathematical Formula 2] below.

[0258] [Equation 2]

[0259]

[0260]

[0261] At this time, means the length of the SRS sequence. is determined based on [Table 15] below, and can be determined through upper layer signaling, b-SRS and c-SRS. In this case, when b-SRS is set, in [Table 15] below, You can determine the value, The value of b, which is the subscript of , can be determined, and if b-SRS is not set, It can be. Based on c-SRS, in [Table 15] below The value can be determined.

[0262] [Table 15]

[0263]

[0264]

[0265] can be determined through FreqScalingFactor, which is a higher layer signaling, and if the parameter is not set, P_F=1. The terminal can expect that the length of the SRS sequence will be a multiple of 6 if FreqScalingFactor, which is a higher layer signaling, is set.

[0266] can be defined as, The size of the comb can be determined based on the following. At this time, the size of the comb can mean the interval between REs where the SRS is transmitted on the frequency resource. For example, the size of the comb can be This may mean that the spacing between REs where SRS is transmitted is 2 REs. The terminal can be configured for the size of the Comb through the upper layer signaling, transmissionComb. may mean the symbol index within the symbols in which the SRS resource is transmitted. The terminal The maximum cyclic shift value is It can be determined as shown in [Table 16].

[0267] [Table 16]

[0268]

[0269] means the cyclic shift of the i-th antenna port. And the basic sequence is It can be defined as follows:

[0270]

[0271] At this time, can mean the length of the SRS sequence. For one base sequence, different Multiple SRS sequences can be generated depending on the value of δ.

[0272] Multiple base sequences can be divided into groups, and the indices of the groups are can be defined as, can mean the index of the base sequence within the group. If In this case, each group can contain one base sequence, and in this case It could be. If In this case, each group can contain two base sequences, and in this case It could be. The definition of is the length of the sequence It may vary depending on the value of .

[0273] If the length of the basic sequence is 36 or more, i.e. When the basic sequence can be defined as follows. At this time, Is It can be the largest prime number smaller than .

[0274]

[0275] If the length of the basic sequence is 6, 12, 18, 24, i.e. When the basic sequence can be defined as follows.

[0276]

[0277] At this time, for The value of can be defined through [Table 17] to [Table 20] according to the index u.

[0278] If the length of the base sequence is 30, i.e. When the basic sequence can be defined as follows.

[0279]

[0280] If the terminal has the upper layer signaling nrofSRS-Ports-n8 set to ports8tdm, can be defined as follows, otherwise can be defined as

[0281] - if And If, can be defined as

[0282] - if And If, can be defined as

[0283] - When neither of the above cases is true, can be defined as

[0284] antenna port which means the cyclic shift corresponding to can be defined as follows.

[0285]

[0286] At this time, can be defined as follows.

[0287] - And When, can be defined as

[0288] - And This or that, And When, can be defined as

[0289] - When neither of the above cases is true, can be defined as

[0290] At this time, is a parameter that determines the cyclic shift value, which can be set through cyclicShift-n2, cyclicShift-n4, or cyclicShift-n8 in the upper layer signaling transmissionComb. can be determined through the above [Table 16].

[0291] and can be determined as follows.

[0292] - If the upper layer signaling nrofSRS-Ports-n8 is set to ports8tdm, can be defined as, In case of If is defined as, If can be defined as follows. That is, when a terminal transmits in TDM mode for an SRS resource consisting of 8 antenna ports, the antenna port to be transmitted in the first symbol is =For 1000, 1001, 1004, 1005 respectively = Defined as 1000, 1001, 1002, 1003, and the antenna ports to be transmitted in the second symbol are =For 1002, 1003, 1006, 1007 respectively = By defining 1000, 1001, 1002, 1003, when allocating resources for 4 different antenna ports transmitted in each symbol, the resource allocation method for SRS resources consisting of 4 antenna ports can be applied as is.

[0293] - In cases other than the above, i.e. when the upper layer signaling nrofSRS-Ports-n8 is not set to ports8tdm, and can be defined as

[0294] It means the starting position in the frequency dimension of the SRS corresponding to the i-th antenna port. can be defined as follows.

[0295]

[0296] At this time, can be defined as follows.

[0297]

[0298] At this time, can be defined as follows.

[0299] - If, can be defined as

[0300] - If, can be defined as

[0301] - If, can be defined as

[0302] - If, can be defined as

[0303] - If, can be defined as

[0304] - If, can be defined as

[0305] - If, can be defined as

[0306] - For all other cases except the above, can be defined as

[0307] At this time, can be defined as follows.

[0308]

[0309] At this time, can be defined as follows.

[0310]

[0311] can be set to StartRBIndex, which is a higher layer signaling, and if not set, can be defined as

[0312] For cases where the upper layer signaling EnableStartRBHopping is set, the following and Based on the value, it can be determined through [Table 21], otherwise can be defined as

[0313]

[0314] If SRS transmission is performed based on SRS-PosResource, the above can be defined based on [Table 22] below, otherwise (if SRS transmission is performed based on SRS-Resource), can be defined as

[0315] The offset value in the frequency dimension is is a value that determines how far the SRS is transmitted in the frequency dimension from the reference position, and can be set through the upper layer signaling freqDomainShift. Comb offset value is indicated. can be set via combOffset-n2, combOffset-n4, or combOffset-n8 in the upper layer signaling transmissionComb.

[0316] As a higher layer signaling related to frequency hopping of SRS, b-hop within freqHoping can be set, and can be defined as

[0317] n_b is a value representing the index of the frequency position, and can be defined as follows.

[0318] - if In this case, frequency hopping of SRS is not supported, and the index of frequency position is indicated. is all A symbol can have a constant value during a period and can be defined as follows:

[0319]

[0320] At this time, is a value set through the upper layer signaling freqDomainPosition, and if not set, the value can be 0.

[0321] - if In this case, frequency hopping of SRS is supported, can be defined as follows.

[0322] if If, can be defined as follows.

[0323] If not, can be defined as follows.

[0324] At this time, is if If is even, can be defined as, and if If is odd, can be defined as silver It can be defined as 1 regardless of the value.

[0325] can be defined as a parameter that counts the number of SRS transmissions. If the terminal transmits an aperiodic SRS resource, the number of SRS transmissions within a specific slot Within the symbol can be defined as follows. At this time, s can be defined as s=2 if the upper layer signaling nrofSRS-Ports-n8 is set to ports8tdm, and s=1 otherwise. At this time, can be a value set by the repetitionFactor, which is a higher layer signaling, and if not set, can be defined as

[0326] If the terminal transmits periodic or semi-persistent SRS resources, In slots that satisfy can be defined as follows.

[0327]

[0328] At this time, and can mean the period and slot offset of a periodic or semi-persistent SRS, respectively. is the number of slots per frame for SCS configuration μ, is SFN (system frame number), is the slot number within the frame for SCS setting μ.

[0329] [Table 17]

[0330]

[0331] [Table 18]

[0332]

[0333] [Table 19]

[0334]

[0335] [Table 20]

[0336]

[0337] [Table 21]

[0338]

[0339] [Table 22]

[0340]

[0341] Figure 6 is a diagram illustrating a structure in which SRS is allocated for each subband.

[0342] Referring to Fig. 6, an example is shown in which an SRS is allocated to each terminal according to a tree structure set by a base station when a data transmission band corresponding to 40 RB is provided in terms of frequency.

[0343] In Fig. 6, when the level index of the tree structure is b, the top level (b=0) of the tree structure can be composed of one SRS subband with a 40 RB bandwidth. In the second level (b=1), two SRS subbands with a 20 RB bandwidth can be generated from the SRS subband of the b=0 level. Therefore, two SRS subbands can exist in the entire data transmission band of the second level (b=1). In the third level (b=2), five 4 RB SRS subbands can be generated from one 20 RB SRS subband of the level immediately above (b=1), and a structure can be formed in which ten 4 RB SRS subbands exist within one level.

[0344] Based on the configuration of the tree structure described above, the base station can set various levels, SRS subband sizes, and the number of SRS subbands per level for the terminal. Here, the number of SRS subbands at level b generated from one SRS subband of the upper level is N. b , and this N b The indices for the SRS subbands are n b ={0,...,N b-1} can be defined. As the subbands per level are different in this way, terminals can be allocated to each subband per level as illustrated in FIG. 19. For example, terminal 1 (19-00) can be allocated to the first SRS subband (n1=0) of two SRS subbands with a 20 RB bandwidth at level b=1, and terminal 2 (19-01) and terminal 3 (19-02) can be allocated to the first SRS subband (n2=0) and the third SRS subband (n2=2) below the second 20 RB SRS subband, respectively. Through these processes, the terminal can simultaneously transmit SRS through multiple CCs (Component Carriers), and can simultaneously transmit SRS through multiple SRS subbands within one CC.

[0345] [SBFD and Non-SBFD Resource Settings]

[0346] The location of SBFD (Sub-Band Full Duplex) resources can be configured for each cell through higher-layer signaling (e.g., MIB, SIBx, or cell broadcast signals). Through higher-layer signaling, the base station can configure some symbol(s) as downlink symbol(s), some symbol(s) as uplink symbol(s), and some symbol(s) as SBFD symbol(s), for each cell it operates.

[0347] Additionally, the location of SBFD resources can be configured for each terminal via higher-layer signaling (e.g., RRC signaling). The base station can configure some of the SBFD resources configured in a cell-specific manner via higher-layer signaling to be used as SBFD resources by the UE.

[0348] Meanwhile, the base station may configure the terminal to use at least one of the symbol(s) set / confirmed as non-SBFD symbol(s) as SBFD symbol(s) through upper layer signaling.

[0349] Additionally, the terminal identifies both the SBFD symbol(s) configured in a cell-specific manner and the SBFD symbol(s) additionally configured in a terminal-specific manner and operates accordingly.

[0350] While 5G mobile communication services have introduced additional coverage expansion technologies compared to LTE, actual 5G mobile communication services will generally utilize a time division duplex (TDD) system, which is suitable for services with a high proportion of downlink traffic. Furthermore, as the center frequency increases to expand the frequency band, the coverage between base stations and terminals decreases. Therefore, coverage enhancement is a key requirement for 5G mobile communication services. Specifically, to support services where the terminal transmit power is generally lower than that of the base station and the downlink traffic is high, and because the downlink traffic ratio in the time domain is higher than that of the uplink, uplink channel coverage enhancement is a key requirement for 5G mobile communication services. Physical methods for improving uplink channel coverage between base stations and terminals include increasing the uplink channel's time resources, lowering the center frequency, or increasing the terminal's transmit power. However, changing the frequency may be limited because frequency bands are determined by each network operator. Additionally, because the maximum transmission power of a terminal is regulated to reduce interference, there may be restrictions on increasing the maximum transmission power of a terminal to improve coverage.

[0351] Therefore, in order to improve the coverage of base stations and terminals, in addition to dividing uplink and downlink resources in the time domain according to the traffic proportions of uplink and downlink as in a TDD system, uplink and downlink resources can also be divided in the frequency domain as in an FDD (frequency division duplex) system. In one embodiment, a system that can flexibly divide uplink resources and downlink resources in the time domain and the frequency domain may be referred to as an XDD (cross division duplex) system, a Flexible TDD system, a Hybrid TDD system, a TDD-FDD system, a Hybrid TDD-FDD system, etc., and for convenience of explanation, this will be described as an XDD system in the present disclosure. According to one embodiment, X in XDD may mean time or frequency.

[0352] FIG. 7 is a diagram illustrating an uplink-downlink resource configuration of an XDD system that flexibly divides uplink and downlink resources into time domain and frequency domain according to one embodiment of the present disclosure.

[0353] Referring to FIG. 7, from the base station perspective, the uplink-downlink configuration (700) of the overall XDD system can flexibly allocate resources to each symbol or slot (702) according to the traffic proportions of uplink and downlink for the entire frequency band (701). However, this is just an example, and the unit to which resources are allocated is not limited to a symbol or slot (702), and resources can also be flexibly allocated according to units such as mini slots. At this time, a guard band (704) can be allocated between the frequency bands of the downlink resources (703) and the uplink resources (705). This guard band (704) can be allocated as a measure to reduce interference applied to the uplink channel or signal reception due to out-of-band emission that occurs when the base station transmits a downlink channel or signal in the downlink resources (703). At this time, for example, terminal 1 (710) and terminal 2 (720), which have overall more downlink traffic than uplink traffic due to the base station settings, can be allocated downlink and uplink resource ratios of 4:1 in the time domain. At the same time, terminal 3 (730), which operates at the cell edge and has insufficient uplink coverage, can be allocated only uplink resources during a specific time interval due to the base station settings. Additionally, terminal 4 (740), which operates at the cell edge and has insufficient uplink coverage but relatively large amounts of downlink and uplink traffic, can be allocated more uplink resources in the time domain and more downlink resources in the frequency band for uplink coverage. As in the example described above, terminals with relatively large downlink traffic operating at the cell center can be allocated more downlink resources in the time domain, and terminals with relatively insufficient uplink coverage operating at the cell edge can be allocated more uplink resources in the time domain, which is advantageous.

[0354] FIG. 8 is a diagram illustrating an example of an uplink-downlink resource configuration of a full duplex communication system in which uplink and downlink resources are flexibly divided in the time domain and frequency domain, according to one embodiment of the present disclosure.

[0355] According to an example illustrated in FIG. 8, all or part of downlink resources (800) and uplink resources (801) may be set to overlap in the time and frequency domains. Downlink transmission from a base station to a terminal may be performed in an area set as downlink resources (800), and uplink transmission from a terminal to a base station may be performed in an area set as uplink resources (801).

[0356] In one example of FIG. 8, the downlink resources (810) and uplink resources (811) may be configured to overlap entirely in the time resources corresponding to the symbol or slot (802) and the frequency resources corresponding to the bandwidth (803). In this case, since the downlink resources (810) and uplink resources (811) overlap in time and frequency, downlink and uplink transmission and reception of a base station or terminal may occur simultaneously in the same time and frequency resources.

[0357] In another example of FIG. 8, a portion of downlink resources (820) and uplink resources (821) may be configured to overlap in time resources corresponding to symbols or slots and frequency resources corresponding to bandwidth (803). In this case, downlink and uplink transmission and reception of a base station or terminal may occur simultaneously in some areas where downlink resources (820) and uplink resources (821) overlap.

[0358] In another example of FIG. 8, downlink resources (830) and uplink resources (831) can be set so that they do not overlap in time resources corresponding to symbols or slots and frequency resources corresponding to bandwidth (803).

[0359] FIG. 9 is a diagram illustrating a transmission and reception structure for a duplex method according to one embodiment of the present disclosure.

[0360] The transmission / reception structure illustrated in FIG. 9 can be used in a base station device or a terminal device. According to the transmission / reception structure illustrated in FIG. 9, the transmitter may be composed of blocks such as a transmission baseband block (Tx Baseband, 910), a digital pre-distortion block (Digital Pre-Distortion; DPD, 911), a digital-to-analog converter (DAC, 912), a pre-driver (Pre-driver, 913), a power amplifier (PA, 914), and a transmission antenna (Tx Antenna, 915). Each block may perform the following roles.

[0361] Transmit Baseband Block (910): Digital processing block for the transmit signal.

[0362] Digital Pre-Distortion Block (911): Pre-distortion of digital transmission signals.

[0363] Digital-to-Analog Converter (912): Converts digital signals to analog signals.

[0364] Pre-driver (913): Progressive power amplification of analog transmission signals

[0365] Power amplifier (914): Power amplification of analog transmission signals

[0366] Transmitting antenna (915): Antenna for signal transmission

[0367] According to the transmission and reception structure illustrated in FIG. 9, the receiving end may be composed of blocks such as a receiving antenna (Rx Antenna, 924), a low noise amplifier (LNA, 923), an analog-to-digital converter (ADC, 922), a successive interference canceller (Successive Interference Canceller, 921), and a receiving baseband block (Rx Baseband, 920). Each block may perform the following roles.

[0368] Receiving antenna (924): Antenna for receiving signals

[0369] Low noise amplifier (923): Amplifies the power of an analog received signal while minimizing the amplification of noise.

[0370] Analog-to-digital converter (922): Converts analog signals to digital signals.

[0371] Continuous Interference Canceller (921): Interference canceller for digital signals

[0372] Receive Baseband Block (920): Digital processing block for the received signal.

[0373] According to the transmission and reception structure illustrated in Fig. 9, a power amplifier coupler (PA Coupler, 916) and a coefficient update block (Coefficient Update, 917) may be present for additional signal processing between the transmitter and receiver. Each block may perform the following roles.

[0374] Power amplifier connector (916): A block for observing the waveform of an analog transmission signal that has passed through a power amplifier at the receiving end.

[0375] Constant Update Block (917): Updates various constants required for digital domain signal processing at the transmitter and receiver. The constants calculated here can be used to set various parameters in the DPD (911) block at the transmitter and the SIC (921) block at the receiver.

[0376] The transmission and reception structure illustrated in FIG. 9 can be utilized for the purpose of effectively controlling interference between a transmission signal and a reception signal when transmission and reception operations are performed simultaneously at a base station or a terminal device. For example, when transmission and reception occur simultaneously at a certain device, a transmission signal (901) transmitted through a transmission antenna (915) of a transmission end may be received through a reception antenna (924) of a reception end, and in this case, the transmission signal (901) received by the reception end may cause interference (900) with a reception signal (902) that the reception end originally intended to receive. The interference between the transmission signal (901) and the reception signal (902) received by the reception end will be referred to as self-interference (900). For example, to explain specifically, if a base station device performs downlink transmission and uplink reception simultaneously, a downlink signal transmitted by the base station may be received by the reception end of the base station, and as a result, interference may occur between the downlink signal transmitted by the base station and the uplink signal that the base station originally intended to receive at the reception end. If a terminal device performs downlink reception and uplink transmission simultaneously, the uplink signal transmitted by the terminal may be received by the terminal's receiving end, and this may cause interference between the uplink signal transmitted by the terminal and the downlink signal that the terminal originally intended to receive at the receiving end. This interference between links in different directions, i.e., downlink signals and uplink signals, at the base station and the terminal device is also referred to as cross-link interference.

[0377] In one embodiment of the present disclosure, self-interference between a transmission signal (or downlink signal) and a reception signal (or uplink signal) may occur in a system in which transmission and reception can be performed simultaneously.

[0378] For example, magnetic interference may occur in the XDD system described above.

[0379] Figure 10 is a diagram illustrating an example of downlink and uplink resource settings in an XDD system.

[0380] In the case of XDD, downlink (1000) resources and uplink (1003) resources can be distinguished in the frequency domain, and a guard band (GB, 1004) can exist between the downlink (1000) resources and the uplink (1001) resources. Actual downlink transmission can be performed within the downlink bandwidth (1002), and uplink transmission can be performed within the actual uplink bandwidth (1003). At this time, leakage (1006) may occur outside the uplink or downlink transmission band. In an area where the downlink resources (1000) and uplink resources (1001) are adjacent, interference due to this leakage (which may be named Adjacent Carrier Leakage (ACL, 1005)) may occur. FIG. 10 illustrates an example in which an ACL (1005) occurs from a downlink (1000) to an uplink (1001). As the downlink bandwidth (1002) and the uplink bandwidth (1003) become closer together, the influence of signal interference by the ACL (1005) may increase, which may result in performance degradation. For example, as illustrated in FIG. 10, some resource areas (1006) within the uplink band (1003) adjacent to the downlink band (1002) may be significantly affected by interference by the ACL (1005). Some resource areas (1007) within the uplink band (1003) relatively far from the downlink band (1002) may be less affected by interference by the ACL (1005). That is, within the uplink band (1003), there may exist a resource region (1006) that is relatively more affected by interference and a resource region (1007) that is relatively less affected by interference. In order to reduce performance degradation due to the ACL (1005), a guard band (1004) may be inserted between the downlink bandwidth (1002) and the uplink bandwidth (1003).As the size of the guard band (1004) increases, there is an advantage that the interference effect due to the ACL (1005) between the downlink bandwidth (1002) and the uplink bandwidth (1003) may be reduced. However, there may be a disadvantage that resource efficiency may decrease because the resources available for transmission and reception decrease as the size of the guard band (1004) increases. Conversely, as the size of the guard band (1004) decreases, the amount of resources available for transmission and reception may increase, which has the advantage of increasing resource efficiency. However, there is a disadvantage that the interference effect due to the ACL (1005) between the downlink bandwidth (1002) and the uplink bandwidth (1003) may be increased. Therefore, it may be important to determine an appropriate size of the guard band (1004) by considering the trade-off.

[0381] Meanwhile, 3GPP is discussing SBFD (Subband Non-Overlapping Full Duplex) as a new duplex method based on NR. SBFD is a technology that utilizes a portion of downlink resources as uplink resources in the TDD band (spectrum) of frequencies below 6 GHz or above 6 GHz, thereby receiving uplink transmissions from terminals equivalent to the increased uplink resources, thereby expanding the uplink coverage of the terminal, and receiving feedback from the terminal on downlink transmissions using the expanded uplink resources, thereby reducing feedback delay. In the present disclosure, a terminal that receives information on whether SBFD is supported from a base station and can perform uplink transmissions using a portion of downlink resources may be conveniently referred to as an SBFD terminal (SBFD-capable UE). The following methods may be considered for defining the SBFD method in the standard and for an SBFD terminal to determine whether SBFD is supported in a specific cell (or frequency, frequency band).

[0382] First method. In addition to the existing unpaired spectrum (or time division duplex, TDD) or paired spectrum (or frequency division duplex, FDD) frame structure types, another frame structure type (e.g., frame structure type 2) may be introduced to define the above SBFD. The above frame structure type 2 may be defined as being supported in the specific frequency or frequency band, or the base station may indicate to the terminal whether SBFD is supported as system information. The SBFD terminal may receive the system information including whether SBFD is supported and determine whether SBFD is supported in the specific cell (or frequency, frequency band).

[0383] Second method. Whether SBFD is additionally supported in a specific frequency or frequency band of an existing unpaired spectrum (or TDD) can be indicated without defining a new frame structure type. In the second method, whether SBFD is additionally supported in a specific frequency or frequency band of an existing unpaired spectrum can be defined, or the base station can indicate to the terminal whether SBFD is supported as system information. The SBFD terminal can receive system information including whether SBFD is supported and determine whether SBFD is supported in the specific cell (or frequency, frequency band).

[0384] In the first and second methods described above, the information on whether SBFD is supported may be information that indirectly indicates whether SBFD is supported by additionally setting a portion of downlink resources as uplink resources in addition to the TDD UL (uplink)-DL (downlink) resource configuration information indicating downlink slot (or symbol) resources and uplink slot (or symbol) resources of TDD (for example, SBFD resource configuration information in FIG. 12 described below), or may be information that directly indicates whether SBFD is supported.

[0385] In the present disclosure, the SBFD terminal can obtain cell synchronization by receiving a synchronization signal block during the initial cell access for connecting to a cell (or base station). The process for obtaining cell synchronization may be the same for the SBFD terminal and the existing TDD terminal. Thereafter, the SBFD terminal can determine whether the cell supports SBFD through a MIB acquisition process, a SIB acquisition process, or a random access process.

[0386] The system information for transmitting information on whether the above SBFD is supported may be system information transmitted separately from the system information for terminals supporting other versions of the standard within the cell (e.g., existing TDD terminals), and the SBFD terminal may determine whether SBFD is supported by obtaining all or part of the system information for the existing TDD terminal and the separately transmitted system information. If the SBFD terminal obtains only the system information for the existing TDD terminal or obtains system information on non-support of SBFD, the cell (or base station) may determine that it supports only TDD.

[0387] If the information on whether the above SBFD is supported is included in the system information for a terminal that supports a different version of the standard (e.g., an existing TDD terminal), the information on whether the above SBFD is supported may be inserted at the very end so as not to affect the acquisition of system information by the existing TDD terminal. If the SBFD terminal does not obtain the information on whether the above SBFD is supported inserted at the very end, or obtains information that SBFD is not supported, the SBFD terminal can determine that the cell (or base station) only supports TDD.

[0388] If the information on whether the SBFD is supported is included in the system information for a terminal supporting a different version of the standard (e.g., an existing TDD terminal), the information on whether the SBFD is supported may be transmitted through a separate PDSCH so as not to affect the acquisition of system information by the existing TDD terminal. That is, a terminal that does not support SBFD can receive a first SIB (or SIB1) including existing TDD-related system information from a first PDSCH. An SBFD-supporting terminal can receive a first SIB (or SIB) including existing TDD-related system information from a first PDSCH, and a second SIB including SBFD-related system information from a second PDSCH. Here, the first PDSCH and the second PDSCH can be scheduled as the first PDCCH and the second PDCCH, and the CRC (cyclic redundancy code) of the first PDCCH and the second PDCCH can be scrambled with the same RNTI (e.g., SI-RNTI). The search space for monitoring the second PDCCH can be obtained from the system information of the first PDSCH, and if it is not obtained (i.e., the system information of the first PDSCH does not include information about the search space), the second PDCCH can be received in the same search space as the search space of the first PDCCH.

[0389] As described above, when the SBFD terminal determines that the cell (or base station) supports only TDD, the SBFD terminal can perform random access procedures and transmit and receive data / control signals in the same manner as a conventional TDD terminal.

[0390] The base station may configure separate random access resources for each of an existing TDD terminal or an SBFD terminal (e.g., an SBFD terminal supporting duplex communication and an SBFD terminal supporting half-duplex communication), and transmit configuration information (control information or configuration information indicating time-frequency resources that can be used for PRACH) for the random access resources to the SBFD terminal through system information. The system information for transmitting information for the random access resources may be separately transmitted system information that is distinct from system information for terminals supporting different versions of standards within a cell (e.g., an existing TDD terminal).

[0391] The base station may be able to distinguish whether the TDD terminal supporting different versions of the standard performs random access or the SBFD terminal performs random access by setting separate random access resources for the TDD terminal and the SBFD terminal supporting different versions of the standard. For example, the separate random access resource set for the SBFD terminal may be a resource that the existing TDD terminal determines to be a downlink time resource, and the SBFD terminal performs random access through an uplink resource (or a separate random access resource) set to a part of the frequency of the downlink time resource, so that the base station may determine that the terminal attempting random access through the uplink resource is an SBFD terminal.

[0392] Alternatively, the base station may not set up separate random access resources for SBFD terminals, but may set up common random access resources for all terminals within the cell. In this case, configuration information for the random access resources may be transmitted to all terminals within the cell through system information, and the SBFD terminal that has received the system information may perform random access to the random access resources. Thereafter, the SBFD terminal may complete the random access process and proceed to RRC connection mode for transmitting and receiving data with the cell. After the RRC connection mode, the SBFD terminal may receive an upper layer or physical signal from the base station that can determine that some frequency resources of the downlink time resources are set uplink resources, and may perform SBFD operations, for example, transmit uplink signals on the uplink resources.

[0393] When the SBFD terminal determines that the cell supports SBFD, the terminal may transmit capability information to the base station, including at least one or more of whether the terminal supports SBFD, whether full-duplex communication or half-duplex communication is supported, and the number of transmit or receive antennas it has (or supports), thereby notifying the base station that the terminal attempting to connect is an SBFD terminal. Alternatively, when half-duplex communication support is a mandatory implementation for the SBFD terminal, whether or not the half-duplex communication is supported may be omitted from the capability information. The SBFD terminal may report the capability information to the base station through a random access procedure, may report to the base station after completing the random access procedure, or may report to the base station after proceeding to an RRC connection mode for transmitting and receiving data with the cell.

[0394] The above SBFD terminal may support half-duplex communication, which performs only uplink transmission or downlink reception at a time, like a conventional TDD terminal, or may support full-duplex communication, which performs both uplink transmission and downlink reception at a time. Accordingly, whether the above half-duplex communication or full-duplex communication is supported can be reported to the base station by the SBFD terminal through a capability report, and after the report, the base station can configure the SBFD terminal to transmit and receive using half-duplex communication or full-duplex communication. When the SBFD terminal reports the capability for the above half-duplex communication to the base station, since a duplexer generally does not exist, a switching gap may be required to change the RF between transmission and reception when operating in FDD or TDD.

[0395] FIG. 11 is a diagram illustrating an example of SBFD operation in a TDD band of a wireless communication system to which the present disclosure is applied.

[0396] In Fig. 11 (a), a case where TDD is operated in a specific frequency band is illustrated. In a cell where TDD is operated, a base station can transmit and receive signals including data / control information in downlink slots (or symbols), uplink slots (or symbols) (1101), and flexible slots (or symbols) based on settings for TDD UL-DL resource configuration information indicating downlink slot (or symbol) resources and uplink slot (or symbol) resources of TDD with an existing TDD terminal or SBFD terminal.

[0397] In Fig. 11, it can be assumed that the DDDSU slot format is set according to the TDD UL-DL resource configuration information. Here, 'D' is a slot composed entirely of downlink symbols, 'U' is a slot composed entirely of uplink symbols, and 'S' is a slot that is not 'D' or 'U', that is, a slot that includes a downlink symbol or an uplink symbol or a flexible symbol. Here, for convenience, it can be assumed that S is composed of 12 downlink symbols and 2 flexible symbols. In addition, the DDDSU slot format can be repeated according to the TDD UL-DL resource configuration information. That is, the repetition period of the TDD configuration is 5 slots (5 ms for 15 kHz SCS, 2.5 ms for 30 kHz SCS, etc.).

[0398] Next, in (b), (c) to (d) of FIG. 11, a case in which SBFD is operated together with TDD in a specific frequency band is illustrated.

[0399] Referring to (b) of FIG. 11, the terminal can set a portion of the frequency band of the cell as a frequency band (1110) capable of uplink transmission. This band can be called an uplink subband (UL subband). And the uplink subband (UL subband) can be applied to all symbols of all slots. The terminal can transmit an uplink channel or signal scheduled for all symbols (1112) within the subband (UL subband). However, the terminal cannot transmit an uplink channel or signal in a band other than the subband (UL subband).

[0400] Referring to (c) of Fig. 11, the terminal may set some of the frequency bands of the cell as a frequency band (1120) in which uplink transmission is possible, and may set a time region in which the frequency band is activated. Here, this frequency band may be called an uplink subband (UL subband). In (c) of Fig. 11, the uplink subband (UL subband) is deactivated in the first slot, and the uplink subband (UL subband) may be activated in the remaining slots. Accordingly, the terminal may transmit an uplink channel or signal in the uplink subband (UL subband) (1122) of the remaining slots. Therefore, although the uplink subband (UL subband) is activated in units of slots here, whether it is activated or not may be set in units of symbols.

[0401] Referring to (d) of FIG. 11, the terminal can be configured with time-frequency resources capable of uplink transmission. The terminal can configure one or more time-frequency resources as time-frequency resources capable of uplink transmission. For example, some frequency bands (1132) of the first and second slots can be configured as time-frequency resources capable of uplink transmission. In addition, some frequency bands (1133) of the third slot and some frequency bands (1134) of the fourth slot can be configured as time-frequency resources capable of uplink transmission.

[0402] In the following description, a time-frequency resource capable of uplink transmission within a downlink symbol or slot may be referred to as an SBFD resource. Furthermore, a symbol within a downlink symbol for which an uplink subband is configured may be referred to as an SBFD symbol. Furthermore, a time-frequency resource capable of downlink reception within an uplink symbol or slot may be referred to as an SBFD resource. Furthermore, a symbol within an uplink symbol for which a downlink subband is configured may be referred to as an SBFD symbol.

[0403] For convenience, in the present disclosure, a band in which downlink channels or signals can be received, excluding uplink sub-bands, is referred to as a downlink sub-band. A terminal can configure at most one uplink sub-band and at most two downlink sub-bands in one symbol. For example, a terminal can be configured with one of {uplink sub-band, downlink sub-band}, {downlink sub-band, uplink sub-band}, or {first downlink sub-band, uplink sub-band, second downlink sub-band} in the frequency domain.

[0404] FIG. 12 is a diagram illustrating an SBFD setting according to one embodiment of the present disclosure.

[0405] Referring to FIG. 12, the terminal may be configured with an uplink symbol, a downlink symbol, or a flexible symbol according to the TDD configuration. Here, all symbols in the 'D' slot are downlink symbols. All symbols in the 'U' slot are uplink symbols. The 'S' slot is a slot that is not a 'D' slot or a 'U' slot. The terminal may be configured with a UL BWP (1220). In addition, the terminal may be configured with a UL subband (1210) in a DL symbol. In addition, the terminal may be configured with a slot or a symbol to which the UL subband (1110) is to be applied. Referring to FIG. 12, the UL subband may be applied only to some symbols among the DL symbols of the TDD periodicity. The UL subband may be applied to the DL symbols of the second and third slots, but the UL subband may not be applied to the other DL symbols. Here, the SBFD symbol can represent a symbol to which the UL subband is applied.

[0406] The base station can set a guard frequency interval between the DL sub-band and the UL sub-band in the terminal. When the guard frequency interval is set for the terminal, frequency resources in the frequency domain can be divided into a UL sub-band, a guard frequency interval, and a DL sub-band. For the purpose of explaining the present embodiment, it is assumed that the guard frequency interval is included in the UL sub-band. That is, in the following description, the expression 'if 'X' overlaps with the UL sub-band' can be interpreted as 'if 'X' overlaps with the UL sub-band or the guard frequency interval'. In addition, the expression 'if 'X' overlaps with the UL sub-band' can be interpreted as 'if 'X' does not overlap with the DL sub-band'.

[0407] The expression 'if 'X' does not overlap with a UL sub-band' can be interpreted as 'if 'X' does not overlap with a UL sub-band and a Guard frequency interval.' Furthermore, the expression 'if 'X' does not overlap with a UL sub-band' can be interpreted as 'if 'X' overlaps with a DL sub-band.'

[0408] FIG. 13 is a diagram illustrating an example of a non-SBFD symbol of a wireless communication system according to an embodiment of the present disclosure.

[0409] Referring to FIG. 13, the entire RB located in the non-SBFD symbol (1301) of the carrier (1302) can be used in downlink (DL), uplink (UL), or sidelink (SL) transmission depending on the transmission direction.

[0410] According to one embodiment of the present disclosure, a terminal and a base station can perform operations according to subband full duplex (SBFD, subband non-overlapping full duplex). An SBFD subband in which an SBFD operation is performed can be composed of at least one or more consecutive RBs, and resources belonging to an SBFD subband have the same transmission direction. That is, all resources belonging to a single SBFD subband can be used for downlink, uplink, or sidelink. The SBFD operation can be performed by utilizing some resources of a TDD carrier.

[0411] A base station can set a BWP for SBFD operation in a terminal. The BWP set by the base station can include a DL-BWP (Downlink Bandwidth Part), an UL-BWP (Uplink Bandwidth Part), and an SL-BWP (Sidelink Bandwidth Part). The base station and the terminal can communicate using SBFD symbols (symbols in which SBFD subbands are located on the time axis). At most one UL subband can be located in an SBFD symbol. One or at most two DL subbands can be located in an SBFD symbol. The UL subband located in the SBFD symbol can be located in the center part of the carrier or at one end. The location of the SBFD symbol can be set in a DL symbol or a Flexible symbol.

[0412] Figures 14, 15, and 16 are diagrams illustrating examples of SBFD symbols of a wireless communication system according to an embodiment of the present disclosure. Some of the RBs (one or more RBs among the RBs included in the carrier) located in the SBFD symbols (1401, 1501, 1601) of the carriers (1402, 1502, 1602) may belong to downlink subbands and uplink subbands (1403, 1503, 1603). For example, the position of the uplink subband (1403, 1503, 1603) located in the SBFD symbol (1401, 1501, 1601) may be located at the center of the uplink carrier as in FIG. 14, at one end with a low RB index as in FIG. 15 (one or more RBs consecutive on the frequency axis from the RB with the lowest index among the RBs included in the carrier), or at one end with a high RB index as in FIG. 16 (one or more RBs consecutive on the frequency axis from the RB with the highest index among the RBs included in the carrier).

[0413] According to one embodiment of the present disclosure, the location of the SBFD symbol may be signaled to the terminal. For example, the location of the SBFD symbol may be signaled by one or a combination of one or more of an RRC message, a SIB (System Information Block) message, a MAC CE, and a DCI.

[0414] According to one embodiment of the present disclosure, the location of the SBFD subband can be signaled to the terminal. For example, the location of the SBFD subband can be signaled by one or a combination of one or more of an RRC message, an SIB message, a MAC CE, and a DCI. According to one embodiment of the present disclosure, the size (subband bandwidth) of the SBFD subband configured to the terminal can be set in units of RBs, that is, in units of multiple RBs. According to one embodiment of the present disclosure, the size of the SBFD subband configured to the terminal can be set in units of multiple RBs as one group, that is, to include multiple groups. The units can include, for example, an RB Group (RBG), a Precoding Resource Block Group (PRG), etc.

[0415] According to one embodiment of the present disclosure, a base station and a terminal can communicate using SBFD symbols. For example, the base station can transmit data to the terminal using the DL subband of the SBFD symbol, and the terminal can transmit data to the base station using the UL subband of the SBFD symbol. As another example, sidelink communication between terminals can be performed using SBFD symbols. For example, the terminal can transmit and receive a sidelink signal using the UL subband of the SBFD symbol.

[0416] According to one embodiment of the present disclosure, a base station can transmit data to a terminal using both SBFD symbols and non-SBFD symbols (symbols in which an SBFD subband is not located). For example, the base station can transmit a PDSCH to a terminal using both SBFD symbols and non-SBFD symbols. The base station can transmit data to a terminal via a PDSCH using both SBFD symbols and non-SBFD symbols included in one slot. The base station can transmit data to a terminal via a PDSCH using both a slot including an SBFD symbol and a slot including a non-SBFD symbol.

[0417] According to one embodiment of the present disclosure, a terminal can transmit data to a base station using both SBFD symbols and non-SBFD symbols. The terminal can transmit a PUSCH to the base station using both SBFD symbols and non-SBFD symbols. The terminal can transmit data to the base station via the PUSCH using both SBFD symbols and non-SBFD symbols included in one slot. The terminal can transmit data to the base station via the PUSCH using both a slot including an SBFD symbol and a slot including a non-SBFD symbol.

[0418] According to one embodiment of the present disclosure, a terminal can transmit data to another terminal using both SBFD symbols and non-SBFD symbols. The terminal can transmit a physical sidelink shared channel (PSSCH) to another terminal using both SBFD symbols and non-SBFD symbols. The terminal can transmit data to another terminal through the PSSCH using both SBFD symbols and non-SBFD symbols included in one slot. The terminal can transmit data to another terminal through the PSSCH using both slots including SBFD symbols and slots including non-SBFD symbols.

[0419] According to one embodiment of the present disclosure, one TTI may include at least one SBFD symbol and / or at least one non-SBFD symbol.

[0420] According to one embodiment of the present disclosure, when symbols used for transmission include both SBFD symbols and non-SBFD symbols, the amount of available frequency resources in SBFD symbols may be different from the amount of available frequency resources in non-SBFD symbols. For example, the number of RBs included in a DL subband located in an SBFD symbol may be less than or equal to the number of RBs included in a DL non-SBFD symbol. The number of RBs included in a UL subband located in an SBFD symbol may be less than or equal to the number of RBs included in a UL non-SBFD symbol. The sum of the number of RBs included in a DL subband located in an SBFD symbol and the number of RBs included in a UL subband located in an SBFD symbol may be less than or equal to the number of RBs included in a non-SBFD symbol.

[0421] Figures 17 and 18 are diagrams illustrating slots of a wireless communication system according to an embodiment of the present disclosure. Slots (1701, 1801) containing only SBFD symbols and slots (1702, 1802) containing only non-SBFD symbols may be positioned consecutively. As illustrated, uplink subbands (1703, 1803) and downlink subbands (1704, 1804) may be positioned in slots (1701, 1801) containing only SBFD symbols. In FIGS. 17 and 18, slots (1701, 1801) containing only SBFD symbols are shown to be ahead of slots (1702, 1802) containing only non-SBFD symbols, but conversely, slots (1701, 1801) containing only SBFD symbols may be behind slots (1702, 1802) containing only non-SBFD symbols.

[0422] [Regarding terminal capability reporting]

[0423] In LTE and NR, a terminal, while connected to a serving base station, can perform a procedure to report its supported capabilities to the base station. In the description below, this is referred to as a UE capability report.

[0424] A base station can transmit a UE capability inquiry message requesting a capability report to a connected terminal. The UE capability inquiry message may be referred to as a UE capability report request. The message may include a UE capability request for each RAT (radio access technology) type of the base station. The RAT type-specific request may include information on a combination of frequency bands supported by the base station. In addition, in the case of the UE capability inquiry message, UE capabilities for multiple RAT types may be requested through a single RRC message container transmitted by the base station, or the base station may include multiple UE capability inquiry messages including UE capability requests for each RAT type and transmit them to the terminal. That is, the UE capability inquiry may be repeated multiple times in one message, and the terminal may configure a corresponding UE capability information message and report it multiple times. In a next-generation mobile communication system, a base station may request UE capabilities for MR-DC (Multi-RAT dual connectivity), including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity). Additionally, the terminal capability inquiry message is typically transmitted initially after the terminal is connected to the base station, but the base station may request it under any conditions when necessary.

[0425] In the above step, the terminal that receives the UE capability report request from the base station configures the terminal capability based on the RAT type and band information requested from the base station. Below is a summary of how the terminal configures the UE capability in the NR system.

[0426] 1. If the UE receives a list of LTE and / or NR bands through a UE capability request from the base station, the UE configures a band combination (BC) for EN-DC and NR stand-alone (SA). That is, it configures a candidate list of BCs for EN-DC and NR SA based on the bands requested to the base station via FreqBandList. Furthermore, the bands are prioritized in the order listed in FreqBandList.

[0427] 2. If the base station requests UE capability reporting by setting the "eutra-nr-only" flag or the "eutra" flag, the UE completely removes NR SA BCs from the list of configured BC candidates. This operation can only occur when the LTE base station (eNB) requests the "eutra" capability.

[0428] 3. The terminal then removes fallback BCs from the BC candidate list constructed in the above step. Here, a fallback BC is a BC obtained by removing at least one band corresponding to an SCell from a random BC. This step can be omitted because the BC before removing the band corresponding to at least one SCell can already cover the fallback BC. This step also applies to MR-DC, i.e., to LTE bands. The BCs remaining after this step are the final "candidate BC list."

[0429] 4. The terminal selects BCs to report by selecting BCs that match the requested RAT type from the final "candidate BC list" above. In this step, the terminal constructs the supportedBandCombinationList in a set order. That is, the terminal constructs BCs and UE capabilities to report according to the preset rat-Type order (nr -> eutra-nr -> eutra). In addition, it constructs a featureSetCombination for the constructed supportedBandCombinationList, and constructs a list of "candidate feature set combinations" from the candidate BC list after removing the list for the fallback BC (which contains capabilities of the same or lower level). The "candidate feature set combinations" above include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations in the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0430] 5. Also, if the requested rat Type is eutra-nr and is influencing, featureSetCombinations are included in both containers, UE-MRDC-Capabilities and UE-NR-Capabilities. However, the NR feature set is included only in UE-NR-Capabilities.

[0431] After terminal capabilities are configured, the terminal transmits a terminal capability information message containing the terminal capabilities to the base station. Based on the terminal capabilities received from the terminal, the base station then performs appropriate scheduling and transmission / reception management for the terminal.

[0432] Referring to the descriptions related to the above-described SRS resource (set) settings and SRS antenna port settings, the operations of the base station and the terminal are proposed by considering up to four antenna ports. Specifically, in the RRC settings of the base station and the terminal, the SRS resource or the SRS resource set can be configured using parameters (e.g., at least one of srs-ResourceID, nrofSRS-Ports, transmissionComb, combOffset, cyclicShift, resourceMapping, startPostition, nrofSymbols, repetitionFator, freqDomainPosition, FreqDomainShfit, freqHopping, groupOrSequenceHopping, resourceType, sequenceID, spatialRelationInfo) according to the number of antenna ports.

[0433] Below, the operation of a base station and an electronic device to support multiple SRS ports is described in detail by describing various embodiments.

[0434] In the present disclosure, a base station, which performs resource allocation of an electronic device, may be at least one of a gNode B, a gNB, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The electronic device may include a terminal, a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function, a CPE, a FWA, a vehicle, an industrial device, etc. The electronic device may support more than four Tx antenna ports.

[0435] Hereinafter, embodiments of the present disclosure will be described using a 5G system as an example, but embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, this may include LTE or LTE-A mobile communication and mobile communication technologies developed after 5G. Accordingly, embodiments of the present disclosure may be applied to other communication systems with some modifications within a range that does not significantly deviate from the scope of the present disclosure as judged by a person skilled in the art. The contents of the present disclosure can be applied to FDD, TDD, and / or XDD (and / or SBFD, full duplex) systems.

[0436] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents of this specification.

[0437] In the following description of the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0438] - MIB (Master Information Block)

[0439] - SIB (System Information Block) or SIB

[0440] - RRC (Radio Resource Control)

[0441] - MAC (Medium Access Control) CE (Control Element)

[0442] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the physical layer channel or signaling below.

[0443] - PDCCH (Physical Downlink Control Channel)

[0444] - DCI (Downlink Control Information)

[0445] - UE-specific DCI

[0446] - Group common DCI

[0447] - Common DCI

[0448] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0449] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0450] - PUCCH (Physical Uplink Control Channel)

[0451] - UCI (Uplink Control Information)

[0452] The term slot used in the present disclosure below is a general term that may refer to a specific time unit corresponding to a TTI (transmit time interval, transmission time interval), and specifically may mean a slot used in a 5G NR system, or a slot or subframe used in a 4G LTE system.

[0453] In the present disclosure below, the above examples are described through a number of embodiments, but they are not independent and one or more embodiments may be applied simultaneously or in combination.

[0454] <Embodiment 1: SRS Resource and Resource Set Configuration Considering Sub-band Full Duplex (SBFD)>

[0455] In addition to the terminal capabilities described above, the following describes in detail the capabilities for SRS resource configuration and SRS transmission considering SBFD.

[0456] For example, during the RRC configuration process, the base station may configure SRS resources and / or SRS resource sets for the SBFD slot and / or non-SBFD slot to the terminal. The base station may transmit the SRS resources and / or SRS resource sets for the SBFD slot and / or non-SBFD slot to the terminal through RRC signaling. Here, the meaning of SBFD slot means that at least one uplink section (e.g., SBFD symbol(s)) is configured in a downlink section within one slot. That is, the base station may configure the uplink and downlink separately in the frequency domain (frequency division multiplexed, FDMed) so as to configure at least one uplink section within the downlink section. Specifically, the base station configures at least one SRS resource and / or SRS resource set in at least one uplink section, SBFD symbol(s), and the terminal may transmit an SRS based on the SRS resource and / or SRS resource set configured within the configured SBFD symbol(s).

[0457] Meanwhile, the meaning of a non-SBFD slot is that in a downlink section within a slot, at least one uplink section (e.g., SBFD symbol(s)) is not set. It means the same as the slot based on the downlink and uplink of a basic TDD system.

[0458] For another embodiment, during the RRC configuration process, the base station may configure SRS resources and / or SRS resource sets for SBFD symbol(s) and / or non-SBFD symbol(s) to the terminal. The base station may transmit the SRS resources and / or SRS resource set configurations for SBFD symbol(s) and / or non-SBFD symbol(s) to the terminal through RRC signaling. Specifically, when the base station configures SRS resources and / or SRS resource sets for the terminal, the base station may indicate index information of a symbol through which the SRS is transmitted. In this case, the position of the symbol through which the SRS is transmitted may be determined based on the index of the SBFD symbol and / or non-SBFD symbols within the slot.

[0459] Below, various embodiments for setting SRS resources in the SBFD symbol(s) and non-SBFD symbol(s) intervals set within at least one slot described above are described in detail. At least some of the embodiments below may be applied in combination.

[0460] FIG. 19A is a diagram illustrating an example of settings of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0461] FIG. 19B is a diagram showing an example of settings of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0462] FIG. 20 is a diagram showing an example of a configuration of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0463] For example, referring to FIG. 19A, a base station (e.g., a gNB) may configure / set SRS resources in SBFD symbol(s) and non-SBFD symbol(s) as separate / distinct SRS resource sets and / or SRS resources, respectively. The base station may separately configure an SRS resource set including at least one SRS resource configured with at least one SBFD symbol (or including at least one SBFD symbol) within a slot and an SRS resource set including at least one SRS resource configured with at least one non-SBFD symbol (or including at least one non-SBFD symbol). Specifically, the base station may configure at least one resource set (e.g., a first SRS resource set) for configuring SRS resources for at least one SBFD symbol period within a slot. Additionally, the base station may configure at least one other resource set (e.g., a second SRS resource set) for configuring SRS resources for a non-SBFD symbol period within a slot.

[0464] Referring to FIG. 19A, the first SRS resource set may include the first SRS resource for configuring an SBFD symbol interval. Meanwhile, the second SRS resource set may include the second SRS resource for configuring a non-SBFD symbol interval. For example, the first SRS resource configured in the SBFD symbol interval may be configured to be included in an uplink band (or uplink sub-band) corresponding to the SBFD symbol interval. In addition, for example, the second SRS resource configured in the non-SBFD symbol interval may be configured to be included in a frequency domain corresponding to the non-SBFD symbol interval.

[0465] According to the present embodiment, a separate SRS resource set is set to distinguish between the first SRS resource and the second SRS resource, so that each SRS resource and / or SRS resource set for the SBFD symbol interval and the non-SBFD symbol interval can be set to be simply distinguished in the frequency domain, which has the advantage.

[0466] For another embodiment, referring to FIG. 19B, a base station (e.g., a gNB) may configure SRS resources within an SBFD slot, which is composed of SBFD symbol(s) and non-SBFD symbol(s), into the same SRS resource set. The base station may configure an SRS resource set including at least one SRS resource that is composed of at least one SBFD symbol (or includes at least one SBFD symbol) within the slot and at least one SRS resource that is composed of at least one non-SBFD symbol (or includes at least one non-SBFD symbol). That is, one SRS resource set may include at least one SRS resource that is composed of at least one SBFD symbol (or includes at least one SBFD symbol) within at least one slot and at least one SRS resource that is composed of at least one non-SBFD symbol (or includes at least one non-SBFD symbol). Specifically, the base station may configure one common resource set (SRS resource set #1) for configuring SRS resources of at least one SBFD symbol period and a non-SBFD symbol period within the slot. Referring to FIG. 19B, the SRS resource set in the SBFD symbol interval may be set to be included in the uplink band (or uplink subband) corresponding to the SBFD symbol interval and / or may be set to include at least a portion of the uplink band corresponding to the SBFD symbol interval and / or at least a portion of the downlink band (or downlink subband) corresponding to the SBFD symbol interval. In this case, handling of the SRS resource refers to the description of various embodiments described below.

[0467] For another embodiment, referring to FIG. 20, the base station may configure SRS resources of non-SBFD slots composed of non-SBFD symbol(s) into the same SRS resource set. Here, the base station may configure the SRS resource set of the non-SBFD slot (e.g., the third SRS resource set) to be different from the SRS resource set of the SBFD slot (e.g., the fourth SRS resource set).

[0468] Referring to FIG. 20, the fourth SRS resource set may include a first SRS resource for configuring an SBFD symbol interval and a second SRS resource for configuring a non-SBFD symbol interval. The fourth SRS resource set may include a first SRS resource configured in an SBFD symbol interval within an SBFD slot and a second SRS resource configured in a non-SBFD symbol interval within an SBFD slot. Meanwhile, the third SRS resource set may include a third SRS resource and a fourth SRS resource for configuring a non-SBFD symbol and a non-SBFD slot interval. The third SRS resource set may include a first SRS resource and a second SRS resource configured in a non-SBFD slot.

[0469] That is, the base station and the terminal can distinguish and set an SRS resource set that is a mixture of SBFD symbols and non-SBFD symbols, such as {first SRS resource and second SRS resource}, and an SRS resource set that includes only non-SBFD symbols. The base station can separately set an SRS resource set that includes SRS resources configured (included) in a non-SBFD slot, and an SRS resource set for SRS resources configured (included) in an SBFD slot that includes at least one SBFD symbol. Of course, the base station and the terminal can also distinguish and set an SRS resource set that is a mixture of SBFD symbols and non-SBFD symbols, such as {first SRS resource and second SRS resource}, and an SRS resource set that includes only SBFD symbols.

[0470] <Example 2: SRS resource configuration in time and frequency domains considering Sub-band Full Duplex (SBFD)>

[0471] Hereinafter, various embodiments for setting separate / distinct SRS resource sets in SBFD symbol(s) and non-SBFD symbol(s) intervals set within at least one slot described above will be described in detail. In addition, when setting SRS resources set in each SBFD symbol interval as one SRS resource set and setting SRS resources set in each non-SBFD symbol interval as a separate SRS resource set, setting methods in the time domain and the frequency domain will be described in detail. The following embodiments relate to a setting method of SRS resources in the time domain and a setting method in the frequency domain. At least some of the following embodiments may be applied in combination.

[0472] [Time domain]

[0473] As explained above, for cells, base stations and / or terminals that do not support SBFD, when the terminal transmits SRS based on periodic or semi-persistent SRS resources, In slots satisfying the SRS transmission count parameter can be defined as follows.

[0474]

[0475] For definitions and descriptions of each parameter in the formula, see the SRS comb offset / cyclic shift settings described above.

[0476] Meanwhile, T SRSrefers to the cycle of SRS, and cells, base stations, and terminals that do not support SBFD can follow the above formula as is, but cells, base stations, and terminals that support SBFD (SBFD-aware UE) may have different criteria for counting cycles.

[0477] For example, a cell supporting SBFD, a base station, and a terminal supporting SBFD may have a periodic or semi-persistent SRS cycle, T SRS When counting, only SBFD slots containing at least one SBFD symbol can be counted. This is because the base station and the terminal set the SBFD symbol so that periodic or semi-persistent SRS is transmitted only in the SBFD slot, so that the count of non-SBFD slots can be ignored and only SBFD slots can be counted.

[0478] In another embodiment, a base station of a cell supporting SBFD and a terminal supporting SBFD may use a periodic or semi-persistent SRS cycle, T SRS When counting, both SBFD slots and non-SBFD slots can be counted. This may mean that the basic slot count is followed even though the base station and the terminal have set the SBFD symbol so that periodic or semi-persistent SRS is transmitted only in SBFD slots.

[0479] Also, on the other hand, T offset means slot offset, and cells, base stations and terminals that do not support SBFD can follow the above formula as is, but cells, base stations and terminals that support SBFD (SBFD-aware UE) may have different criteria for counting cycles.

[0480] For example, a base station of a cell supporting SBFD and a terminal supporting SBFD may use T, which is a slot offset for periodic or semi-persistent SRS resource transmission. offsetWhen counting, only SBFD slots containing at least one SBFD symbol can be counted. This is because the base station and the terminal set the SBFD symbol so that periodic or semi-persistent SRS is transmitted only in the SBFD slot, so that the count of non-SBFD slots can be ignored and only SBFD slots can be counted.

[0481] In another embodiment, a base station of a cell supporting SBFD and a terminal supporting SBFD may specify T, which is a slot offset for periodic or semi-persistent SRS resource transmission. offset When counting, both SBFD slots and non-SBFD slots can be counted. This may mean that the basic slot count is followed even though the base station and the terminal have set the SBFD symbol so that periodic or semi-persistent SRS is transmitted only in SBFD slots.

[0482] In the previous description, a counting method in slot units according to various embodiments was described, and below, a counting method in symbol units according to various embodiments is described.

[0483] FIG. 21 is a diagram showing an example of a configuration of SRS resources and / or SRS resource sets according to one embodiment of the present disclosure.

[0484] Referring to FIG. 21, the base station may configure SRS resources in at least some or all symbols among at least one SBFD symbol interval in at least one slot for the terminal. In addition, the base station may configure one slot to include at least one or more consecutive SBFD symbols and at least one or more consecutive non-SBFD symbols. Here, the boundary between the consecutive SBFD symbol intervals and the consecutive non-SBFD symbol intervals may be referred to as an SBFD boundary. For example, in FIG. 21, the boundary between symbols #5 and #6 and the boundary between symbols #9 and #10 may be SBFD boundaries.

[0485] For example, the base station may configure an SRS resource set including at least one SRS resource based on one or more consecutive SBFD symbol resources within a single slot. Here, the SRS resource configuration starting from the SBFD symbol resource may not be allowed to cross the SBFD boundary with the non-SBFD symbol resource. The SRS resource set starting from the SBFD symbol resource may not be allowed to be configured to cross the SBFD boundary. Conversely, the SRS resource configuration starting from the non-SBFD symbol resource may not be allowed to cross the SBFD boundary. The SRS resource set starting from the SBFD symbol resource may be allowed to be configured to cross the SBFD boundary.

[0486] For example, referring to FIG. 21, the base station may configure the first SRS resource in the first SRS resource set for the terminal, but may not configure the second SRS resource. This can be simply implemented and operated by excluding ambiguous operations such as resource overlapping collisions in SRS transmission based on the resource configuration of the base station and the terminal. Alternatively, the base station may configure the first SRS resource and the second SRS resource in the first SRS resource set for the terminal, but the terminal may not transmit the second SRS resource if another uplink / downlink transmission is instructed in the non-SBFD symbol interval. For example, transmission for the second SRS resource may be canceled / reserved / dropped, but is not limited thereto. This has the advantage of ensuring flexibility in the resource configuration of the base station and determining whether to transmit or not to transmit depending on the situation of the terminal.

[0487] In another embodiment, the base station may configure an SRS resource set including at least one SRS resource based on one or more consecutive SBFD symbol resources within a single slot. Here, the SRS resource configuration starting from the SBFD symbol resource may allow crossing the SBFD boundary to the non-SBFD symbol resource. For the SRS resource set starting from the SBFD symbol resource, it may be allowed to be configured to cross the SBFD boundary. Conversely, the SRS resource configuration starting from the non-SBFD symbol resource may also allow crossing the SBFD boundary. For the SRS resource set starting from the non-SBFD symbol resource, it may be allowed to be configured to cross the SBFD boundary. This can maximize the freedom of resource configuration by leaving the resource configuration as flexible as possible in SRS transmission based on the resource configuration of the base station and the terminal.

[0488] For example, referring to FIG. 21, the base station can configure a first SRS resource and a second SRS resource within a first SRS resource set for the terminal, and the terminal can perform SRS transmission according to an instruction of another uplink transmission (e.g., PUSCH, PUCCH, SRS, etc.) or downlink transmission (e.g., PDSCH, PDCCH, etc.) in a non-SBFD symbol interval. The terminal can perform transmission for SRS resources and / or other uplinks in the non-SBFD symbol interval. For example, the terminal can transmit an SRS corresponding to the first SRS resource and / or the second SRS resource. In addition, the base station can configure a third SRS resource and a fourth SRS resource within the second SRS resource set for the terminal. The terminal can assume that the SRS resource configuration started in the non-SBFD symbol interval is maintained so that SRS transmission is possible by applying an offset of a frequency domain preset in the SBFD symbol interval or changing a part of the resource. That is, the terminal can apply a preset frequency domain offset to the fourth SRS resource or change a portion of the resource. For example, the fourth SRS resource can be included / configured in an uplink subband by applying a frequency domain offset and / or changing a portion of the resource. This can support a great deal of scalability in base station resource configuration and terminal SRS transmission by maintaining resource configuration even in SBFD symbol intervals following non-SBFD symbol intervals.

[0489] In another embodiment, the base station may configure an SRS resource set including at least one SRS resource based on one or more consecutive SBFD symbol resources within a single slot. Here, the SRS resource configuration starting from the SBFD symbol resource may allow crossing the SBFD boundary to the non-SBFD symbol resource, and conversely, the SRS resource configuration starting from the non-SBFD symbol resource may not allow crossing the SBFD boundary. The SRS resource set starting from the SBFD symbol resource may be allowed to be configured to cross the SBFD boundary, and the SRS resource set starting from the non-SBFD symbol resource may not be allowed to be configured to cross the SBFD boundary. This may reduce additional standard signaling in the frequency domain because the uplink subband in the SBFD symbol resource is smaller than the uplink band in the non-SBFD symbol resource. The present disclosure may not exclude cases contrary to this. For example, it may be permissible for a set of SRS resources starting from a non-SBFD symbol resource to be set across an SBFD boundary, and it may not be permissible for a set of SRS resources starting from an SBFD symbol resource to be set across an SBFD boundary.

[0490] For example, referring to FIG. 21, the base station can configure the first SRS resource and the second SRS resource within the first SRS resource set for the terminal, and the terminal can perform SRS transmission according to an instruction of another uplink transmission (e.g., PUSCH, PUCCH, SRS, etc.) or downlink transmission (e.g., PDSCH, PDCCH, etc.) in the non-SBFD symbol interval. Meanwhile, the base station can configure the third SRS resource within the second SRS resource set for the terminal, but cannot configure the fourth SRS resource. The terminal can assume that the SRS resource configuration started in the non-SBFD symbol interval ends in the non-SBFD symbol interval. This is because the operation after the non-SBFD symbol interval requires the design of a separate frequency domain offset, etc., which may bring about operational complexity.

[0491] The base station may configure SRS resources in at least some or all symbols of at least one SBFD symbol section in at least one slot for the terminal. In addition, the base station may configure, in resource mapping, at least one or more consecutive SBFD symbols and at least one or more consecutive non-SBFD symbols to be included in one slot, using a parameter nrofSymbols-rXX (e.g., r19) that counts the number of symbols of the SRS resource and a parameter startPosition-rXX (e.g., r19) that indicates a symbol start position of the SRS resource.

[0492] For example, the parameter nrofSymbols-rXX (e.g., r19) may count the number of consecutive SRS resource symbols in a single consecutive SBFD symbol interval within a slot, and startPosition-rXX (e.g., r19) may indicate an index corresponding to a start position of consecutive SRS resources within the SBFD symbol interval.

[0493] For another embodiment, the parameter nrofSymbols-rXX (e.g., r19) may count the number of all SRS resource symbols in at least one consecutive SBFD symbol interval within a slot, and startPosition-rXX (e.g., r19) may indicate an index corresponding to the start position of the very first SRS resource within the slot within the SBFD symbol interval.

[0494] In another embodiment, the parameter nrofSymbols-rXX (e.g., r19) may count the number of all SRS resource symbols in at least one consecutive SBFD symbol interval within a slot, and startPosition-rXX (e.g., r19) may indicate an index corresponding to the start position of each first SRS resource within the slot, within the SBFD symbol interval.

[0495] Table 23 illustrates some information elements (IEs) of the RRC parameters (SRS-Config) for SRS resource configuration.

[0496] [Table 23]

[0497]

[0498] One or more parameters for configuring SRS resources in SBFD resources may be introduced in relation to at least some of the resourceMapping and resourceMapping included in Table 23, namely startPosition, nrofSymbols, and repetitionFactor. The following parameter names are examples, and the present disclosure is not limited thereto.

[0499] The base station may configure SRS resources for at least some or all symbols in at least one SBFD symbol section in at least one slot for the terminal. In addition, the base station may configure, in resource mapping, at least one or more consecutive SBFD symbols and at least one or more consecutive non-SBFD symbols to be included in one slot, using a parameter repetitionFactor-rXX (e.g., r19) that counts the number of symbols in which the configured SRS resources are repeated identically.

[0500] For example, the parameter repetitionFactor-rXX (e.g., r19) counts the number of repeated SRS resource symbols in a single consecutive SBFD symbol section within a slot, and the SRS resource setting set in the startPosition-rXX described above may be repeated as many times as the number of SRS resource symbols.

[0501] For another embodiment, the parameter repetitionFactor-rXX (e.g., r19) may count the number of repeated SRS resource symbols in at least one or more SBFD symbol intervals within a slot, and the SRS resource configuration set in startPosition-rXX described above may be repeated as many times as the number of SRS resource symbols. That is, the base station and the terminal may determine that the SRS resource configuration is maintained even if the SBFD symbol intervals within a single slot are separated.

[0502] Meanwhile, if the terminal transmits SRS based on periodic or semi-persistent SRS resources, the SRS transmission count parameter (SRS counter) When determining, the Toffset value can be calculated by applying the various embodiments described above.

[0503] Meanwhile, if the terminal transmits SRS based on periodic or semi-persistent SRS resources, the SRS transmission count parameter (SRS counter) When deciding, the number of SRS resource symbols set in RRC is the T described above offset The number of symbols of SRS resources transmitted within a slot can be counted based on the value. That is, the terminal can count the number of symbols of SRS resources considering SBFD slots and / or non-SBFD slots. Alternatively, the terminal can count the number of symbols of SRS resources configured across SBFD symbols and non-SBFD symbols, considering only SBFD slots.

[0504] Meanwhile, when the terminal transmits SRS based on periodic or semi-persistent SRS resources, when determining the location where SRS transmission starts, it is based on the various embodiments described above. The value It can be calculated by applying it to the terminal. That is, the terminal The value can be calculated by considering all symbols in the slot (e.g. 14), or by considering only the number of SBFD symbols in the slot (e.g. X).

[0505] Below, a method of counting slots in SRS resource configuration, which is set for a base station and a terminal to transmit aperiodic SRS, is described.

[0506] The base station can perform the RRC configuration described above to instruct the terminal to transmit aperiodic SRS. In addition, the base station can transmit SRS offset indicator information when transmitting aperiodic SRS through signaling based on DCI format 0_1 / 0_2 / 1_1 / 1_1 using PDCCH. Specifically, the base station can preset candidate values ​​of the SRS offset indicator (e.g., K value) in RRC for the terminal, and indicate at least one of the candidate values ​​using the DCI of the PDCCH transmitted thereafter. Here, the RRC configuration indicates a list of different available slot offset values ​​of up to four from the n+k slot to the slot where the aperiodic SRS resource set is transmitted, when the nth slot is set as a slot where a triggering DCI exists by availableSlotOffsetList. availableSlotOffsetList indicates a list of different possible slot offset values ​​(e.g., up to 4 slot offset values) between slots in which a set of SRS resources (e.g., a set of aperiodic SRS resources) are transmitted, starting from slot n+k, where slot n is the slot having a triggering DCI (i.e., the DCI that triggered the SRS transmission) (i.e., the triggering DCI was transmitted) and k is the slot offset (e.g., as set in slotOffset).

[0507] FIG. 22A is a diagram illustrating an example of an operation for aperiodic SRS transmission in the time domain and frequency according to one embodiment of the present disclosure.

[0508] FIG. 22B is a diagram illustrating an example of an operation for aperiodic SRS transmission in the time domain and frequency according to one embodiment of the present disclosure.

[0509] For example, referring to FIG. 22A, a base station may indicate to a terminal a value corresponding to an SRS offset indicator field in the DCI of a first PDCCH. A terminal receiving the DCI may check the value corresponding to the SRS offset indicator field. Here, the base station and the terminal may count the total number of slots, regardless of SBFD slots and / or non-SBFD slots, based on the value of the SRS offset indicator, and determine that an aperiodic SRS is indicated to be transmitted in slots past that number. For example, if the number of slots corresponding to the value of the SRS offset indicator is 0, the terminal may determine that a first SRS resource is indicated. For another example, if the number of slots corresponding to the value of the SRS offset indicator is 1, the terminal may determine that a second SRS resource is indicated. For another example, if the number of slots corresponding to the value of the SRS offset indicator is 2, the terminal may determine that a third SRS resource is indicated.

[0510] For another embodiment, referring to FIG. 22A, the base station may indicate to the terminal a value corresponding to the SRS offset indicator field in the DCI of the first PDCCH. The terminal receiving the DCI may check the value corresponding to the SRS offset indicator field. Here, if the DCI is indicated in an SBFD slot, the base station and the terminal may count only the number of SBFD slots based on the value of the SRS offset indicator and determine that an aperiodic SRS is indicated to be transmitted in the previous SBFD slots by that number. For example, if the number of slots corresponding to the value of the SRS offset indicator is 0, the terminal may determine that the first SRS resource is indicated. As another example, if the number of slots corresponding to the value of the SRS offset indicator is 1, the terminal may count only the SBFD slot and determine that the third SRS resource is indicated.

[0511] For another embodiment, referring to FIG. 22B, the base station may indicate to the terminal a value corresponding to the SRS offset indicator field in the DCI of the first PDCCH. The terminal receiving the DCI may check the value corresponding to the SRS offset indicator field. Here, if the DCI is indicated in a non-SBFD slot, the base station and the terminal may count only the number of non-SBFD slots based on the value of the SRS offset indicator and determine that an aperiodic SRS is indicated to be transmitted in the previous SBFD slot by that number. For example, if the number of slots corresponding to the value of the SRS offset indicator is 0, the terminal may determine that an SRS resource of the same non-SBFD slot is indicated. For another example, if the number of slots corresponding to the value of the SRS offset indicator is 1, the terminal may count only non-SBFD slots and not count SBFD slots, thereby determining that an SRS resource set after one non-SBFD slot is indicated.

[0512] [Frequency domain]

[0513] Referring to FIGS. 19A to 22B, the base station may allocate at least a portion of the entire downlink band (downlink subband) to the terminal as an uplink band (uplink subband) (e.g., an UL band of SBFD). In addition, the base station may set a frequency domain of SRS resources based on the bandwidth of part or all of the allocated UL subbands. In addition, when the frequency domain is set, the terminal may determine that SRS transmission is possible if an SRS resource is set in the UL band of SBFD.

[0514] For example, if a base station configures a frequency bandwidth for a non-SBFD symbol interval within a slot to a terminal, the terminal may assume that no SRS resource set and / or SRS resource exceeding the frequency bandwidth is allocated to the terminal in the SBFD symbol interval within the slot.

[0515] For another embodiment, if the base station configures a frequency bandwidth for a non-SBFD symbol interval within a slot to a terminal, the terminal may assume that no SRS resource set and / or SRS resources are allocated to exceed the frequency bandwidth in the SBFD symbol interval.

[0516] For another embodiment, if the base station sets a maximum frequency bandwidth for an SBFD symbol interval within a slot to the terminal, the terminal may assume that no SRS resource set and / or SRS resources are allocated in excess of the maximum frequency bandwidth in the SBFD symbol interval. The base station may set a maximum frequency bandwidth for SRS resources, and the terminal expects that an SRS resource having a frequency bandwidth less than or equal to the maximum frequency bandwidth is set in the SBFD symbol interval.

[0517] Specifically, if the base station sets a maximum frequency bandwidth for an SBFD symbol interval within a slot to the terminal and sets a first SRS resource that satisfies a first bandwidth less than or equal to the maximum bandwidth within a first SRS resource set, the terminal may consider the first SRS resource set and / or the first SRS resource to be valid, and even if the base station sets a second SRS resource that satisfies a second bandwidth exceeding the maximum bandwidth within a second SRS resource set, the terminal may assume that the second SRS resource set and / or the second SRS resource set for the SBFD symbol interval within the slot is not allocated. Alternatively, if the maximum frequency bandwidth is set, the terminal may not expect that the second SRS resource that satisfies the second bandwidth exceeding the maximum bandwidth within the second SRS resource set is set.

[0518] The base station and the terminal may reuse at least one of the SRS bandwidth setting tables exemplified in Tables 15 to 22 used to set the bandwidth of SRS resources in non-SBFD symbol intervals for setting the bandwidth of SRS resources in SBFD symbol intervals.

[0519] In addition, the base station and the terminal can adjust the SRS resource allocation location in terms of the reference point grid by setting the value of the shift in the frequency domain in the above setting table, N_shift, and can be set by including it in the upper layer parameter FreqDomainShift of the SRS-Resource IE or SRS-PosResource IE. When the SRS bandwidth setting table is reused, the frequency domain shift value N_shift can adjust the SRS allocation with respect to the reference point grid. In addition, the frequency domain shift value N_shift can be included in freqDomainShift in the SRS-Resource or SRS-PosResource.

[0520] For example, the reference point grid may be aligned to match the lowest frequency resource (RB or RE, the RB or RE with the smallest index) within the uplink band for SBFD. For another embodiment, the reference point grid may be aligned to match the highest frequency resource (RB or RE, the RB or RE with the largest index) within the uplink band for SBFD. For another embodiment, the reference point grid may be aligned to match the center frequency resource within the uplink band for SBFD, in which case the reference point grid may not be aligned to match the lowest / highest frequency in the uplink band for SBFD.

[0521] <Third Embodiment: Setting the Same SRS Resource Set Considering Sub-band Full Duplex (SBFD)>

[0522] Hereinafter, various embodiments for setting up a same / common SRS resource set in the SBFD symbol(s) and non-SBFD symbol(s) intervals set within at least one slot described above are described in detail.

[0523] In one embodiment, the base station may configure a common SRS resource set for the terminal to configure SRS resources for at least one SBFD symbol interval and a non-SBFD symbol interval within a slot. That is, the terminal configured with the common resource set may apply SRS resources starting from an SBFD symbol interval within the slot to non-SBFD symbol intervals as well. In addition, SRS resources starting from a non-SBFD symbol interval within the slot may be applied to the SBFD symbol interval as well using a higher layer configuration (e.g., RRC configuration). The terminal may assume that SRS resources within the SRS resource set within the SBFD symbol interval are configured.

[0524] In another embodiment, the base station may configure a single SRS common resource set for the terminal to configure SRS resources for at least one SBFD symbol period and non-SBFD symbol period within a slot. In addition, the base station may schedule resources of an uplink signal and / or resources of a downlink signal within at least one SBFD symbol period and non-SBFD symbol period within a slot to the terminal. Here, if the SRS resources and / or resource sets within the SBFD and non-SBFD periods overlap with the resources of the uplink signal (e.g., PUCCH, PUSCH, other types of SRS) and / or the resources of the downlink signal (e.g., PDCCH, PDSCH, CSI-RS, SSB) in at least one symbol, at least one of the SRS, the uplink signal, and the downlink signal may not be transmitted according to priority. For example, it may be canceled / reserved / dropped, but is not limited thereto.

[0525] FIG. 23 is a diagram illustrating an example of the operation of a base station and an electronic device (terminal) according to one embodiment of the present disclosure.

[0526] Referring to FIG. 23, at step 2300, the base station may receive capability information from the terminal. The capability information that may be reported at this time may be a combination of at least one of the terminal capabilities mentioned in the above-described embodiments. Step 2300 may also be omitted. For example, the base station may store previously received terminal capabilities and may not request a terminal capability report. Since the specific details regarding the terminal capability report are the same as those described above, they are omitted below.

[0527] In operation 2305, the base station may transmit configuration information to the terminal via upper layer signaling. At this time, the configuration information may be a combination of at least one of the SBFD symbol and / or slot-related configuration information mentioned in the above-described embodiment. For example, the configuration information may include information related to at least one of the information described in the first to third embodiments. In addition, the terminal may identify an SRS resource and / or an SRS resource set based on the SRS configuration information. The SRS resource may include a plurality of SRS transmission units (e.g., symbols). That is, the SRS transmission may be configured to be transmitted via a plurality of SRS transmission units. In addition, the terminal may determine whether some time units of the SRS resources overlap with other resources (when they overlap with other uplink channels and signal transmissions, downlink channels and signal receptions).

[0528] In operation 2310, the terminal may transmit an SRS to the base station. At this time, the terminal may check the configured SRS resource and / or resource set related information, and determine at least one of whether to transmit the SRS, a transmission time point (time domain), a transmission resource (frequency domain), and a signal sequence based on at least one of the first embodiment described above.

[0529] The above flowchart illustrates exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0530] The embodiments of the present disclosure described above (e.g., the first to third embodiments) can be performed by the terminal of FIG. 24 and the base station of FIG. 25.

[0531] FIG. 24 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0532] Referring to FIG. 24, the terminal may include a transceiver (24-00, 24-10), which refers to a terminal receiving unit (24-00) and a terminal transmitting unit (24-10), a memory (not shown), and a terminal processing unit (24-05, or a terminal control unit or processor). Depending on the communication method of the terminal described above, the transceiver (24-00, 24-10), the memory, and the terminal processing unit (24-05) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the components described above. In addition, the transceiver (24-00, 24-10), the memory, and the processor (24-05) may be implemented in the form of a single chip.

[0533] The transceiver (24-00, 24-10) can transmit and receive signals with the base station. Here, the signals can include control information and data. To this end, the transceiver (24-00, 24-10) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transceiver (24-00, 24-10), and the components of the transceiver (24-00, 24-10) are not limited to the RF transmitter and RF receiver.

[0534] In addition, the transmitter / receiver unit (24-00, 24-10) can receive a signal through a wireless channel and output it to the processor (24-05), and transmit a signal output from the processor through the wireless channel.

[0535] Memory can store programs and data necessary for the terminal's operation. Furthermore, memory can store control information or data included in signals transmitted and received by the terminal. Memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0536] Additionally, the processor (24-05) can control a series of processes so that the terminal can operate according to the aforementioned embodiments. For example, the processor (24-05) can check SRS configuration information and, if at least one of a plurality of symbols configured to transmit the SRS overlaps with another resource, determine whether to transmit the SRS according to the aforementioned embodiments. There may be multiple processors, and the processor (24-05) can perform component control operations of the terminal by executing a program stored in memory.

[0537] FIG. 25 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0538] Referring to FIG. 25, the base station may include a transceiver (25-00, 25-10), which refers to a base station receiver (25-00) and a base station transmitter (25-10), a memory (not shown), and a base station processing unit (25-05, or a base station control unit or processor). According to the communication method of the base station described above, the transceiver (25-00, 25-10), the memory, and the base station processing unit (13-05) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. In addition, the transceiver (25-00, 25-10), the memory, and the processor (25-05) may be implemented in the form of a single chip.

[0539] The transceiver (25-00, 25-10) can transmit and receive signals with the terminal. Here, the signals can include control information and data. To this end, the transceiver (25-00, 25-10) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transceiver (25-00, 25-10), and the components of the transceiver (25-00, 25-10) are not limited to the RF transmitter and RF receiver.

[0540] In addition, the transmitter / receiver unit (25-00, 25-10) can receive a signal through a wireless channel and output it to the processor (25-05), and transmit the signal output from the processor through the wireless channel.

[0541] The memory can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data included in signals transmitted and received by the base station. The memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0542] The processor (25-05) can control a series of processes so that the base station can operate according to the aforementioned embodiments of the present disclosure. For example, the processor (25-05) can control each component of the base station to transmit configuration information including configurations for SRS resources and / or configurations for SRS resource sets to the terminal. There may be multiple processors (25-05), and the processors (25-05) can perform component control operations of the base station by executing a program stored in memory.

[0543] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0544] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

[0545] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0546] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present disclosure.

[0547] In the specific embodiments of the present disclosure described above, components included in the present disclosure are expressed singularly or plurally, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0548] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and to help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the above-described embodiments may be combined and operated as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment may be combined to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure may be combined to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other modifications based on the technical scope of the embodiments may also be implemented.

Claims

1. In a method performed by a terminal in a communication system, A step of receiving a SBFD (subband non-overlapping full duplex) setting and an SRS (sounding reference signal) setting through upper layer signaling, wherein the SRS setting includes a setting for an SRS resource set for non-SBFD and a setting for an SRS resource set for SBFD, the setting for the SRS resource set for non-SBFD includes an IE (information element) for resource mapping corresponding to the SRS resource set for non-SBFD, and the setting for the SRS resource set for SBFD includes an IE for resource mapping corresponding to the SRS resource set for SBFD; A step of identifying an SRS resource based on the above SRS settings; and A method comprising the step of transmitting an SRS from the identified SRS resource.

2. In paragraph 1, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: The period and slot offset associated with the SRS resource are counted for the SBFD slot and the non-SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol and the non-SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol and the non-SBFD symbol within the slot; or The period and slot offset associated with the SRS resource are counted for the SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol within the slot; and The number of repetitions associated with the above resource mapping is identified based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot, A method in which, when the above SRS resource is included in the SRS resource set for the SBFD and the resource type of the setting for the SRS resource set for the SBFD is set periodically or semi-statically, the SBFD symbols constituting the SRS resource set for the SBFD are allowed to be set beyond the SBFD boundary.

3. In paragraph 1, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: A method in which an SRS offset indicator of downlink control information (DCI) that triggers transmission of the above SRS is identified based on counting for SBFD slots and non-SBFD slots, or is identified based on counting for SBFD slots.

4. In paragraph 1, If the above SRS resource is included in the SRS resource set for the SBFD, the SRS resource is identified based on a reference point grid and a frequency domain shift value corresponding to the SRS resource, A method wherein the above reference point grid is aligned with a frequency resource unit having a smallest index among frequency resource units included in an SBFD subband, or is aligned with a frequency resource unit having a largest index among frequency resource units included in an SBFD subband, and the frequency resource unit is a physical resource block (PRB) or a resource element (RE).

5. At the terminal of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Receive SBFD (subband non-overlapping full duplex) settings and SRS (sounding reference signal) settings through upper layer signaling, wherein the SRS settings include settings for an SRS resource set for non-SBFD and settings for an SRS resource set for SBFD, wherein the settings for the SRS resource set for non-SBFD include an IE (information element) for resource mapping corresponding to the SRS resource set for non-SBFD, and wherein the settings for the SRS resource set for SBFD include an IE for resource mapping corresponding to the SRS resource set for SBFD; Identifying SRS resources based on the above SRS settings; and A terminal configured to transmit SRS from the above-identified SRS resource.

6. In paragraph 5, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: The period and slot offset associated with the SRS resource are counted for the SBFD slot and the non-SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol and the non-SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol and the non-SBFD symbol within the slot; or The period and slot offset associated with the SRS resource are counted for the SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol within the slot; and The number of repetitions associated with the above resource mapping is identified based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot, A terminal in which the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set periodically or semi-statically, and the SBFD symbols constituting the SRS resource set for the SBFD are allowed to be set beyond the SBFD boundary.

7. In paragraph 5, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: A terminal in which an SRS offset indicator of downlink control information (DCI) that triggers transmission of the above SRS is identified based on counting for SBFD slots and non-SBFD slots, or is identified based on counting for SBFD slots.

8. In paragraph 5, If the above SRS resource is included in the SRS resource set for the SBFD, the SRS resource is identified based on a reference point grid and a frequency domain shift value corresponding to the SRS resource, The terminal, wherein the above reference point grid is aligned with a frequency resource unit having a smallest index among frequency resource units included in an SBFD subband, or is aligned with a frequency resource unit having a largest index among frequency resource units included in an SBFD subband, and the frequency resource unit is a physical resource block (PRB) or a resource element (RE).

9. In a method performed by a base station in a communication system, A step of transmitting a SBFD (subband non-overlapping full duplex) setting and an SRS (sounding reference signal) setting through upper layer signaling, wherein the SRS setting includes a setting for an SRS resource set for non-SBFD and a setting for an SRS resource set for SBFD, wherein the setting for the SRS resource set for non-SBFD includes an IE (information element) for resource mapping corresponding to the SRS resource set for non-SBFD, and wherein the setting for the SRS resource set for SBFD includes an IE for resource mapping corresponding to the SRS resource set for SBFD; and A method comprising the step of transmitting an SRS from an SRS resource related to the above SRS setting.

10. In paragraph 9, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: The period and slot offset associated with the SRS resource are counted for the SBFD slot and the non-SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol and the non-SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol and the non-SBFD symbol within the slot; or The period and slot offset associated with the SRS resource are counted for the SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol within the slot; and The number of repetitions associated with the above resource mapping is based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot, A method in which, when the above SRS resource is included in the SRS resource set for the SBFD and the resource type of the setting for the SRS resource set for the SBFD is set periodically or semi-statically, the SBFD symbols constituting the SRS resource set for the SBFD are allowed to be set beyond the SBFD boundary.

11. In paragraph 9, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: A method wherein an SRS offset indicator of downlink control information (DCI) that triggers transmission of the above SRS is counted based on counting for SBFD slots and non-SBFD slots, or based on counting for SBFD slots.

12. In paragraph 9, If the above SRS resource is included in the SRS resource set for the SBFD, the SRS resource is based on a reference point grid and a frequency domain shift value corresponding to the SRS resource, A method wherein the above reference point grid is aligned with a frequency resource unit having a smallest index among frequency resource units included in an SBFD subband, or is aligned with a frequency resource unit having a largest index among frequency resource units included in an SBFD subband, and the frequency resource unit is a physical resource block (PRB) or a resource element (RE).

13. In the base station of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Transmitting SBFD (subband non-overlapping full duplex) settings and SRS (sounding reference signal) settings through upper layer signaling, wherein the SRS settings include settings for an SRS resource set for non-SBFD and settings for an SRS resource set for SBFD, wherein the settings for the SRS resource set for non-SBFD include an IE (information element) for resource mapping corresponding to the SRS resource set for non-SBFD, and wherein the settings for the SRS resource set for SBFD include an IE for resource mapping corresponding to the SRS resource set for SBFD; and A base station configured to transmit SRS from SRS resources related to the above SRS settings.

14. In paragraph 13, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to periodic or semi-persistent, the SRS resource: The period and slot offset associated with the SRS resource are counted for the SBFD slot and the non-SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol and the non-SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol and the non-SBFD symbol within the slot; or The period and slot offset associated with the SRS resource are counted for the SBFD slot, the number of symbols associated with the resource mapping is counted for the SBFD symbol within the slot, and the start position associated with the time domain of the SRS resource is counted for the SBFD symbol within the slot; and The number of repetitions associated with the above resource mapping is based on counting for consecutive SBFD symbols within a slot or counting for all SBFD symbols within a slot, A base station, wherein the SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to be periodic or semi-static, and the SBFD symbols constituting the SRS resource set for the SBFD are allowed to be set beyond the SBFD boundary.

15. In paragraph 13, If the above SRS resource is included in the SRS resource set for the SBFD, and the resource type of the setting for the SRS resource set for the SBFD is set to aperiodic, the SRS resource: A base station, wherein the SRS offset indicator of the DCI (downlink control information) that triggers transmission of the above SRS is counted based on the counting for the SBFD slot and the non-SBFD slot, or based on the counting for the SBFD slot.

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