Detection methods and devices in wireless communication systems

Abstract

This invention relates to a communication technology and system for integrating IoT technology with 5G communication systems that support higher data transmission rates than 4G systems. This disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety-related services, etc.). The invention also proposes a method and apparatus for transmitting and receiving reference signals for efficient resource utilization in a wireless communication system.

Description

Technical Field

[0001] The present invention relates to a method and apparatus for transmitting and receiving uplink probe reference signals in a wireless communication system. Background Technology

[0002] To meet the increasing demand for wireless data services from commercially available 4G communication systems, efforts are underway to develop enhanced 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are referred to as super-4G network communication systems or post-LTE systems. To achieve high data transmission rates, the implementation of 5G communication systems in millimeter-wave bands (e.g., the 60GHz band) is being considered. To mitigate any routing losses and increase transmission distance of radio waves in the millimeter-wave band, technologies such as beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO are discussed for 5G communication systems. Furthermore, to enhance networks in 5G communication systems, innovative technologies are being developed for small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), and interference cancellation. In addition, hybrid frequency shift keying and orthogonal amplitude modulation (FQAM) and sliding window superposition coding (SWSC) are being developed for 5G systems as advanced coding and modulation (ACM) methods, as well as filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0003] Innovations to the Internet have emerged from human-centric, interconnected networks that generate and consume information to the Internet of Things (IoT), which provides, receives, and processes information to distributed components such as things. The Internet of Everything (IoE) technology has emerged by combining big data processing technologies connected to cloud servers with IoT technologies. To realize IoT, technological elements such as sensing technology, wired and wireless communication, network infrastructure, service interface technology, and security technology are required; therefore, research is currently underway on sensor networks, machine-to-machine (M2M) technologies, and machine-type communication (MTC) technologies for connecting things. In the IoT environment, intelligent Internet technology (IT) services can be provided, collecting and analyzing data generated in connected things to deliver new value to human life. Through the convergence and complex connections between existing information technology (IT) and various industries, IoT can be applied to smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart appliances, and high-tech medical services.

[0004] Therefore, various attempts are underway to apply 5G communication systems to IoT networks. For example, 5G communication technologies such as sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) have been implemented using beamforming, MIMO, and array antenna technologies. The application of cloud RAN, as a big data processing technology, can be an example of the convergence of 5G and IoT technologies. Summary of the Invention

[0005] [Technical Issues]

[0006] This disclosure provides a method and apparatus for efficiently transmitting and receiving uplink probe reference signals for various services in a mobile communication system.

[0007] [Solution to the problem]

[0008] According to embodiments of this disclosure, a method for operating a terminal of a communication system may include: sending terminal capability information to a base station, the terminal capability information including information relating to at least one Sounding Reference Signal (SRS) antenna switching configuration that the terminal can support; receiving from the base station at least one SRS resource configuration information determined corresponding to the at least one SRS antenna switching configuration; and sending SRS to the base station based on the at least one SRS resource configuration information.

[0009] According to one embodiment, when the SRS antenna switching configuration is 1T6R, the SRS resource configuration information may include up to four resource sets, and six resources corresponding to each antenna port may be distributed to the up to four resource sets.

[0010] According to one embodiment, when the SRS antenna switching configuration is 1T8R, the SRS resource configuration information may include up to four resource sets, and eight resources corresponding to each antenna port may be distributed to the up to four resource sets.

[0011] According to one embodiment, when the SRS antenna switching configuration is 2T6R, the SRS resource configuration information may include up to three resource sets, and the three resources corresponding to each of the two antenna ports may be distributed to the up to three resource sets.

[0012] According to one embodiment, when the SRS antenna switching configuration is 2T8R, the SRS resource configuration information may include up to four resource sets, and the four resources corresponding to each of the two antenna ports may be distributed to the up to four resource sets.

[0013] According to one embodiment, when the SRS antenna switching configuration is 4T8R, the SRS resource configuration information may include up to two resource sets, and two resources corresponding to each of the four antenna ports may be distributed to the up to two resource sets.

[0014] According to embodiments of this disclosure, a method for operating a base station of a communication system may include: receiving terminal capability information from a terminal, the terminal capability information including information relating to at least one Sounding Reference Signal (SRS) antenna switching configuration that the terminal can support; sending at least one SRS resource configuration information determined corresponding to the at least one SRS antenna switching configuration to the terminal; and receiving SRS from the terminal based on the at least one SRS resource configuration information.

[0015] According to embodiments of the present disclosure, a terminal of a communication system may include: a transceiver; and a controller configured to control the transmission of terminal capability information to a base station, the terminal capability information including information relating to at least one Sounding Reference Signal (SRS) antenna switching configuration that the terminal can support, receiving at least one SRS resource configuration information determined corresponding to at least one SRS antenna switching configuration from the base station, and transmitting SRS to the base station based on at least one SRS resource configuration information.

[0016] According to embodiments of the present disclosure, a base station of a communication system may include: a transceiver; and a controller configured to control the reception of terminal capability information from a terminal, the terminal capability information including information relating to at least one Sounding Reference Signal (SRS) antenna switching configuration that the terminal can support, to send at least one SRS resource configuration information determined corresponding to the at least one SRS antenna switching configuration to the terminal, and to receive SRS from the terminal based on the at least one SRS resource configuration information.

[0017] [Beneficial effects of the invention]

[0018] The disclosed embodiments provide a method and apparatus for transmitting and receiving probe reference signals for effective transmission and reception of uplink or downlink in a mobile communication system. Attached Figure Description

[0019] Figure 1 This is a diagram illustrating the basic time-frequency domain structure of a communication system according to an embodiment of the present disclosure.

[0020] Figure 2 This is a diagram illustrating an example of the time slot structure of a communication system according to an embodiment of the present disclosure.

[0021] Figure 3 This is a diagram illustrating an example of the configuration of the bandwidth portion in a communication system according to an embodiment of the present disclosure.

[0022] Figure 4 This is a diagram illustrating an example of a bandwidth portion change process in a communication system according to an embodiment of the present disclosure.

[0023] Figure 5 This is a diagram illustrating an example of a control resource set (CORESET) of a communication system according to an embodiment of the present disclosure.

[0024] Figure 6 This is a diagram illustrating a frequency domain resource allocation method for a communication system according to an embodiment of the present disclosure.

[0025] Figure 7 This is a diagram illustrating an example of time axis resource allocation in a communication system according to an embodiment of the present disclosure.

[0026] Figure 8 This is a diagram illustrating an example of time-axis resource allocation based on subcarrier intervals of data channels and control channels in a wireless communication system according to an embodiment of the present disclosure.

[0027] Figure 9 This is a diagram illustrating the radio protocol structure of a base station and a terminal when performing single-cell, carrier aggregation, and dual connectivity according to embodiments of the present disclosure.

[0028] Figure 10 This is a diagram illustrating examples of various operating scenarios of the SRS according to embodiments of the present disclosure.

[0029] Figure 11 This is a diagram illustrating the uplink transmission structure of a 5G or NR system according to an embodiment of the present disclosure.

[0030] Figure 12 This is a diagram illustrating the structure for assigning SRS to each subband according to an embodiment of the present disclosure.

[0031] Figures 13A to 13D are diagrams illustrating the antenna structure of a terminal according to an embodiment of the present disclosure.

[0032] Figures 14A to 14F are diagrams illustrating the antenna structure of a terminal according to an embodiment of the present disclosure.

[0033] Figures 15A to 15B are diagrams illustrating the antenna structure of a terminal according to an embodiment of the present disclosure.

[0034] Figures 16A to 16C are diagrams illustrating the antenna structure of a terminal according to an embodiment of the present disclosure.

[0035] Figures 17A to 17C are diagrams illustrating the antenna structure of a terminal according to an embodiment of the present disclosure.

[0036] Figure 18 This is a flowchart illustrating the operation of a terminal according to an embodiment of the present disclosure.

[0037] Figure 19 This is a flowchart illustrating the operation of a base station according to an embodiment of the present disclosure.

[0038] Figure 20 This is a block diagram illustrating the configuration of a terminal according to an embodiment of the present disclosure.

[0039] Figure 21 This is a block diagram illustrating the configuration of a base station according to an embodiment of the present disclosure. Detailed Implementation

[0040] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0041] In describing the embodiments, descriptions of technical content well-known in the art to which this disclosure pertains and not directly related to this disclosure will be omitted. This is to more clearly convey the key points of this disclosure without obscuring them by omitting unnecessary descriptions.

[0042] For the same reason, some parts are shown enlarged, omitted, or schematically in the accompanying drawings. Furthermore, the dimensions of each part do not perfectly reflect the actual dimensions. In each drawing, the same reference numerals denote the same or corresponding parts.

[0043] The advantages and features of this disclosure, as well as methods of implementing them, will become apparent from the following detailed description of embodiments in conjunction with the accompanying drawings. However, this disclosure is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments of this disclosure enable its completion and are provided to fully inform those skilled in the art to which this disclosure pertains, and this disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals denote the same parts. Furthermore, in the description of this disclosure, detailed descriptions of relevant functions or constructions will be omitted where such descriptions might unnecessarily obscure the essential points of the disclosure. The terminology described below is defined in consideration of the functions in this disclosure and may vary according to the intentions or habits of users and operators. Therefore, definitions should be based on the entire contents of this specification.

[0044] In the following description, a base station is the object that performs resource allocation for a terminal and can be at least one of a gNode B, eNode B, Node B, base station (BS), radio access unit, base station controller, or node on a network. A terminal can include a user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. In this disclosure, downlink (DL) is the radio transmission path of a signal from the base station to the terminal, while uplink (UL) is the radio transmission path of a signal from the terminal to the base station. Although LTE or LTE-A systems may be described as examples below, embodiments of this disclosure can be applied to other communication systems with similar technical backgrounds or channel types. For example, embodiments of this disclosure may include 5G mobile communication technology (5G systems that can be used interchangeably with new radios (NR) developed after LTE-A), and the following 5G systems may include concepts encompassing existing LTE, LTE-A, and other similar services. Furthermore, this disclosure can be applied to other communication systems with modifications that do not significantly depart from the scope of this disclosure, as determined by a person skilled in the art.

[0045] In this context, it will be understood that each block of the flowchart and combinations thereof can be executed by computer program instructions. Because these computer program instructions can be mounted on the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment generate means for performing the functions described in the flowchart blocks. Because these computer program instructions can be stored in a computer-usable or computer-readable storage device that can instruct the computer or other programmable data processing equipment to perform its functions in a particular manner, the instructions stored in the computer-usable or computer-readable storage device can produce a product containing instruction means for performing the functions described in one or more flowchart blocks. Since the computer program instructions can be mounted on a computer or other programmable data processing equipment, a series of operational steps are performed on the computer or other programmable data processing equipment to generate a computer-executed process; therefore, the instructions for performing the functions of the computer or other programmable data processing equipment can provide steps for performing the functions described in the flowchart blocks.

[0046] Furthermore, each box may represent a portion of a module, segment, or code that includes one or more executable instructions for performing a specified logical function. It should also be noted that in some alternative implementations, the functions stated in the boxes may occur out of order. For example, two boxes shown one after the other may actually execute substantially simultaneously, or these boxes may sometimes execute in reverse order according to their respective functions.

[0047] In this context, the term "unit" as used in this embodiment means a software or hardware component, such as a field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC), and a "unit" performs certain roles. However, a "unit" is not limited to software or hardware. A "unit" may be configured to reside in addressable memory or may be configured to reproduce one or more processors. Thus, by way of example, a "unit" includes components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided in components and "units" may be combined into a smaller number of components and "units," or may be further separated into additional components and "units." Furthermore, components and "units" may be implemented to reproduce one or more CPUs in a device or secure multimedia card. Additionally, in one embodiment, a "unit" may include one or more processors.

[0048] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Hereinafter, the methods and apparatus presented in the embodiments of the present disclosure will be described as examples for improving service coverage, but are not limited to each embodiment and can be used in data channel, control channel, and reference signal transmission and reception methods corresponding to other additional services using all or some combinations of one or more embodiments presented in the present disclosure. Therefore, embodiments of the present disclosure can be applied by means of modifications that will not significantly depart from the scope of the present disclosure, as determined by those skilled in the art.

[0049] Furthermore, in describing this disclosure, detailed descriptions of relevant functions or configurations will be omitted where such descriptions would unnecessarily obscure the essential points of the disclosure. The terminology described below is defined in consideration of the functions in this disclosure and may change according to the intentions or habits of users and operators. Therefore, definitions should be based on the entire contents of this specification.

[0050] Wireless communication systems have evolved from providing voice-oriented services to broadband wireless communication systems that offer high-speed and high-quality packet data services in communication standards such as 3GPP's High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A) and LTE-Pro, as well as 3GPP2's High Rate Packet Data (HRPD) and Ultra Mobile Broadband (UMB), and IEEE 802.16e.

[0051] LTE systems, as a representative example of broadband wireless communication systems, employ Orthogonal Frequency Division Multiplexing (OFDM) in the downlink (DL) and Single-Carrier Frequency Division Multiple Access (SC-FDMA) in the uplink. The uplink refers to the radio link through which user equipment (UE) or mobile station (MS) transmits data or control signals to eNodeB (eNB) or base station (BS), while the downlink refers to the radio link through which the base station transmits data or control signals to terminals. Furthermore, these multiple access methods allow for differentiation of each user's data or control information through allocation and manipulation of that information, ensuring that the time-frequency resources carrying each user's data or control information typically do not overlap, i.e., establishing orthogonality.

[0052] As the next generation of communication systems after LTE, 5G communication systems should support services that simultaneously meet diverse needs, thus freely reflecting the various demands of users and service providers. Services considered for 5G communication systems include enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low latency communications (URLLC).

[0053] The purpose of eMBB is to provide improved data rates than those supported by existing LTE, LTE-A, or LTE-Pro systems. For example, in a 5G communication system, from a base station's perspective, eMBB should be able to provide a peak data rate of 20Gbps in the downlink and 10Gbps in the uplink. Furthermore, 5G communication systems should provide increased user-perceived data rates to terminals while delivering peak data rates. Meeting this requirement may require improvements to various transmit and receive technologies, including more advanced multiple-input multiple-output (MIMO) transmission techniques. Additionally, while LTE systems use a maximum transmission bandwidth of 20MHz in the 2GHz band, 5G communication systems can meet their required data rates by using frequency bandwidths wider than 20MHz in the 3-6GHz or 6GHz or higher bands.

[0054] Furthermore, when the base station supports wideband frequencies, Bandwidth Partial (BWP) technology (where the base station is divided into several frequency bands that can be supported by each terminal within the entire carrier frequency band) has been emphasized as important. That is, when the base station supports BWP, in cases where a particular terminal has a limited BWP capability, a smaller frequency band can be supported for the terminal via BWP, and the terminal's power consumption can be reduced while simultaneously reducing the frequency band by changing the BWP. Moreover, while supporting different frame structures for each of the several BWPs, there is an effect of changing various services that can be supported to a terminal without delay through BWP. BWP technology can be applied to control channels or data channels corresponding to a one-to-one relationship between a predetermined terminal and the base station. Furthermore, for control channels and data channels used to transmit common signals, such as synchronization signals, physical broadcast channels (PBCH), and system information transmitted by the base station to multiple terminals in the system by performing transmission only in the BWP configured for the control and data channels, BWP can be used for base station power reduction.

[0055] Meanwhile, mMTC is considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To effectively deliver IoT, mMTC needs to support large-scale terminal access within a cell, improve terminal coverage, improve battery life, and reduce terminal costs. Because IoT connects to various sensors and devices to provide communication functions, it should be able to support a large number of terminals within a cell (e.g., 1,000,000 terminals / km). 2 Furthermore, because mMTC-enabled terminals are likely to be located in shadow areas not covered by the cell, such as building basements, they require a wider coverage area compared to other services provided by 5G communication systems due to the nature of the service. mMTC-enabled terminals should be configured with low-cost hardware, and because it is difficult to frequently replace the terminal's battery, they need a very long battery life, such as 10 to 15 years.

[0056] Finally, URLLC is a cellular-based wireless communication service for mission-critical applications. Examples include services for remotely controlled robots or machines, industrial automation, drones, remote healthcare, and emergency alarms. Therefore, URLLC communication should offer very low latency and very high reliability. For instance, services supporting URLLC should have an air interface latency of less than 0.5 milliseconds and should simultaneously meet 10... -5 Or a smaller packet error rate requirement. Therefore, for services that support URLLC, 5G systems should provide a smaller Transmission Time Interval (TTI) than other services, and should allocate wide resources in the frequency band to ensure the reliability of the communication link at the same time.

[0057] Three services—eMBB, URLLC, and mMTC—can be reused and transmitted within a single system. (Hereinafter, these can be used interchangeably with the 5G system.) In this case, different transmission and reception technologies and parameters can be used between the services to meet their different requirements.

[0058] The frame structure of a 5G system will be described in more detail below with reference to the accompanying drawings.

[0059] Figure 1 This is a diagram illustrating the basic time-frequency domain structure of the radio resource domain as a 5G system according to an embodiment of the present disclosure.

[0060] exist Figure 1 In the diagram, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in both the time and frequency domains is the resource element (RE) 1-01, which can be defined as an Orthogonal Frequency Division Multiplexing (OFDM) symbol (or Discrete Fourier Transform Extended OFDM (DFT-s-OFDM) symbol) 1-02 on the time axis and a subcarrier 1-03 on the frequency axis. In the frequency domain, The number of consecutive REs (e.g., 12) can constitute a resource block (RB) 1-04. Furthermore, in the time domain, The number of consecutive OFDM symbols can constitute a subframe 1-10.

[0061] Figure 2 This is a diagram illustrating an example of the time slot structure of a 5G communication system.

[0062] Figure 2 An example of the structure of frame 2-00, subframe 2-01, and time slot 2-02 is shown. A frame 2-00 can be defined as 10 ms. A subframe 2-01 can be defined as 1 ms; therefore, a frame 2-00 can be configured with a total of 10 subframes 2-01. Furthermore, time slots 2-02 and 2-03 can be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). A subframe 2-01 can be configured to have one or more time slots 2-02 and 2-03, and the number of time slots 2-02 and 2-03 in each subframe 2-01 can be changed according to μ2-04 and 2-05, which are configuration values ​​for the subcarrier spacing.

[0063] exist Figure 2The example shows the slot structure with μ = 0 (2-04) and μ = 1 (2-05) as subcarrier spacing configuration values. With μ = 0 (2-04), one subframe 2-01 can consist of one slot 2-02, while with μ = 1 (2-05), one subframe 2-01 can consist of two slots 2-03. That is, the number of slots per subframe... The number of slots per frame can be changed according to the configured value of the subcarrier spacing; therefore, the number of slots per frame... It can be changed, and μ can be configured according to each subcarrier spacing. and It can be defined as Table 1.

[0064] [Table 1]

[0065]

[0066] In 5G wireless communication systems, for initial access, a synchronization signal block can be sent (which can be used interchangeably with SSB, SS block, and SS / PBCH block), and the synchronization signal block can be configured using the primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH). During the initial access step where the UE first accesses the system, the UE can first obtain downlink time-domain and frequency-domain synchronization from the synchronization signal through cell search, and obtain the cell ID. The synchronization signal can include PSS and SSS.

[0067] The UE can receive the Transmit Master Information Block (MIB) PBCH from the base station to obtain basic parameter values ​​and system information related to transmission and reception, such as system bandwidth or related control information. Based on this information, the UE can decode the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH) to obtain the System Information Block (SIB). Subsequently, the UE exchanges identifiers with the base station through random access procedures and initially accesses the network through steps such as registration and authentication.

[0068] Synchronization signals are reference signals used for cell search and can be transmitted by applying subcarrier spacing (e.g., phase noise) suitable for the channel environment to each frequency band. A 5G base station can transmit multiple synchronization signal blocks depending on the number of analog beams to be operated. PSS and SSS can be mapped and transmitted on 12 RBs, and PBCH can be mapped and transmitted on 24 RBs.

[0069] The bandwidth portion (BWP) configuration in a 5G communication system will be described in detail below with reference to the accompanying drawings.

[0070] Figure 3 This is a diagram illustrating an example of the configuration of the bandwidth portion in a communication system according to an embodiment of the present disclosure.

[0071] Figure 3 An example is shown where the UE bandwidth 3-00 configuration has two bandwidth sections: bandwidth section #1 (BWP#1) 3-05 and bandwidth section #2 (BWP#2) 3-10. The base station can configure one or more bandwidth sections to the UE, and configure the following information in each bandwidth section.

[0072] [Table 2]

[0073]

[0074]

[0075] This disclosure is not limited to the examples described above, and in addition to configuration information, various parameters related to bandwidth portions can be configured to the UE. This information can be sent by the base station to the UE via higher-layer signaling (e.g., Radio Resource Control (RRC) signaling). At least one of the configured bandwidth portions can be activated. Whether the configured bandwidth portion is activated can be semi-statically sent from the base station to the UE via RRC signaling, or dynamically sent via downlink control information (DCI).

[0076] According to some embodiments, prior to Radio Resource Control (RRC) connection, the UE can receive the configuration of the initial bandwidth portion (initial BWP) for initial access from the base station via the Master Information Block (MIB). More specifically, in the initial access step, the UE can receive configuration information about the search space and a Control Resource Set (CORESET), in which a Physical Downlink Control Channel (PDCCH) can be transmitted for receiving system information (which may correspond to the Remaining System Information (RMSI) or System Information Block 1 (SIB1)) required for initial access via the MIB. Each of the control area and search space configured by the MIB can be considered as ID 0. The base station can notify the UE of frequency allocation information, time allocation information, and configuration information, such as a number for control area #0, via the MIB. Furthermore, the base station can notify the UE of the monitoring period and timing configuration information on control area #0, i.e., configuration information about search space #0, via the MIB. The UE can consider the frequency domain of control area #0 configured to be obtained from the MIB as the initial bandwidth portion for initial access. In this case, the ID of the initial bandwidth portion can be considered as 0.

[0077] The bandwidth configuration supported by 5G systems can be used for a variety of purposes.

[0078] According to some embodiments, when the bandwidth supported by the UE is less than the system bandwidth, it can be supported through bandwidth configuration. For example, by configuring the frequency position of the bandwidth portion to the UE (configuration information 2), the UE can send and receive data at a specific frequency position within the system bandwidth.

[0079] Furthermore, according to some embodiments, to support different parameter sets, the base station can configure multiple bandwidth portions for the UE. For example, to support data transmission and reception for a UE using a 15kHz subcarrier spacing and a 30kHz subcarrier spacing, the two bandwidth portions can be configured with 15kHz and 30kHz subcarrier spacings, respectively. Frequency division multiplexing can be applied to different bandwidth portions, and when data needs to be transmitted and received with a specific subcarrier spacing, the bandwidth portion configured with the corresponding subcarrier spacing can be activated.

[0080] Furthermore, according to some embodiments, to reduce UE power consumption, the base station can configure bandwidth portions with different bandwidth sizes for the UE. For example, very high power consumption may occur when the UE supports a very large bandwidth (e.g., 100MHz) and always uses the corresponding bandwidth to send and receive data. In particular, monitoring an unnecessary downlink control channel with a large 100MHz bandwidth in the absence of service can be very inefficient in terms of power consumption. To reduce UE power consumption, the base station can configure a relatively small bandwidth portion for the UE, for example, a 20MHz bandwidth portion. In the absence of service, the UE can perform monitoring operations in the 20MHz bandwidth portion, and when data is generated, the UE can send and receive data in the 100MHz bandwidth portion according to the base station's instructions.

[0081] In the method for configuring the bandwidth portion, the UE, prior to RRC connection, can receive configuration information about the initial bandwidth portion via the Master Information Block (MIB) during the initial access step. More specifically, the UE can receive the configuration of the control area (control resource set (CORESET) or interchangeable with control resource set) of the downlink control channel, through which downlink control information (DCI) of the scheduling system information block (SIB) can be transmitted from the MIB of the physical broadcast channel (PBCH). The bandwidth of the control area configured as the MIB can be considered as the initial bandwidth portion, and the UE can receive the physical downlink shared channel (PDSCH), through which the SIB is transmitted by the configured initial bandwidth portion. Besides receiving the SIB, the initial bandwidth portion can be used for other system information (OSI), paging, and random access.

[0082] When configuring one or more bandwidth portions for a UE, the base station can instruct the UE to change the bandwidth portion using the bandwidth portion indicator field in the DCI. As an example, in Figure 3 If the currently active bandwidth portion of the UE is bandwidth portion #1, 3-05, the base station can indicate bandwidth portion #2, 3-10 to the UE as a bandwidth portion indicator in the DCI, and the UE can change the bandwidth portion to the bandwidth portion #2, 3-10 indicated by the bandwidth portion indicator in the received DCI.

[0083] As described above, since DCI-based bandwidth portion changes can be indicated by scheduling the PDSCH or Physical Uplink Shared Channel (PUSCH) via DCI, the UE should be able to receive or transmit the DCI-scheduled PDSCH or PUSCH without difficulty when it receives a bandwidth portion change request. To this end, the standard defines the required latency time TBWP for changing the bandwidth portion, and it can be defined, for example, as follows.

[0084] [Table 3]

[0085]

[0086] The requirement for bandwidth portion delay time varies depending on the UE's capability, supporting either Type 1 or Type 2. The UE can report the supported bandwidth portion delay time types to the base station.

[0087] Figure 4 This is a diagram illustrating an example of a method for changing bandwidth according to an embodiment of the present disclosure.

[0088] refer to Figure 4 If the UE receives the DCI including the bandwidth partial change indicator in time slot n according to the requirement of the aforementioned bandwidth partial change delay time (4-15), the UE can receive the DCI no later than time slot n+T. BWP The change to the new bandwidth portion indicated by the bandwidth portion change indicator is completed at the specified time point, and data channels scheduled by the DCI are transmitted and received in the new bandwidth portion 4-10. When the base station wants to schedule a data channel with the new bandwidth portion, it can consider the UE's bandwidth portion change delay time (T). BWP 4-20 determines the time-domain resource allocation for the data channel. That is, when a base station schedules a data channel with a new bandwidth portion, in the method for determining the time-domain resource allocation for the data channel, the base station can schedule the corresponding data channel after the bandwidth portion change delay time (4-35, 4-40). Therefore, the UE may not expect the DCI indication indicating the bandwidth portion change to be less than the bandwidth portion change delay time (T). BWP The time slot offset (K0 or K2) value of 4-20.

[0089] When a UE receives a DCI indicating a partial change in bandwidth (e.g., DCI format 1_1 or 0_1), the UE may refrain from transmitting or receiving for the period from the third symbol of the time slot in which the DCI was received (including the DCI) to the start point of the time slot indicated by the time slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, when the UE has received a DCI indicating a partial change in bandwidth in time slot n, and the time slot offset value indicated by the DCI is K, the UE may refrain from transmitting or receiving from the third symbol of time slot n to the previous symbol of time slot n+K (i.e., the last symbol of time slot n+K-1).

[0090] The following will describe a method for configuring parameters related to transmission and reception for each bandwidth portion in a 5G system.

[0091] The UE can receive configurations of one or more bandwidth portions from the base station, and additionally receive configurations of parameters (e.g., configuration information related to uplink and downlink data channels and control channels) for transmission and reception of each configured bandwidth portion. For example, in Figure 3 In the configuration of the UE receiving bandwidth sections #1, 3-05 and #2, 3-10, the UE can receive the configuration of transmit and receive parameters #1 for bandwidth sections #1, 3-05, and the configuration of transmit and receive parameters #2 for bandwidth sections #2, 3-10. When bandwidth sections #1, 3-05 are activated, the UE can perform transmit to the base station and receive from the base station based on transmit and receive parameters #1; and when bandwidth sections #2, 3-10 are activated, the UE can perform transmit to the base station and receive from the base station based on transmit and receive parameters #2.

[0092] More specifically, the following parameters can be configured from the base station to the UE.

[0093] First, the following information can be configured for the uplink bandwidth portion.

[0094] [Table 4]

[0095]

[0096]

[0097]

[0098] According to the table above, the UE can receive configurations from the base station (corresponding to BWP-UplinkCommon) for parameters related to cell-specific (or cell-common or common) transmissions (e.g., Random Access Channel (RACH), Physical Uplink Control Channel (PUCCH), and Physical Uplink Shared Channel). Furthermore, the UE can receive configurations from the base station (corresponding to BWP-UplinkDedicated) for UE-specific (or dedicated) transmission-related parameters (e.g., PUCCH, PUSCH, unlicensed uplink transmission-based parameters (configured licensed PUSCH), and SNR (Sound Reference Signal)-related parameters).

[0099] The following information can be configured for the downlink bandwidth portion.

[0100] [Table 5]

[0101]

[0102]

[0103] According to the table above, the UE can receive configurations of cell-specific (or cell-common or common) reception-related parameters (e.g., physical downlink control channel (PDCCH) and physical downlink shared channel related parameters) from the base station (corresponding to BWP-DownlinkCommon). Furthermore, the UE can receive configurations of UE-specific (or dedicated) reception-related parameters (e.g., PDCCH, PDSCH, PDSCH based on unlicensed downlink data transmission (semi-persistent scheduling), and radio link monitoring (RLM) related parameters) from the base station (corresponding to BWP-UplinkDedicated).

[0104] Figure 5 This diagram illustrates an example of configuring two control resource sets (control resource sets #1, 5-01, #2, 5-02) within a UE bandwidth portion 510 on the frequency axis and a single timeslot 5-20 on the time axis. Control resource sets 5-01 and 5-02 can be configured within a specific frequency resource 5-03 within the entire UE bandwidth portion 510 on the frequency axis. One or more OFDM symbols can be configured on the time axis, and this can be defined as the control resource set duration 5-04. (See reference...) Figure 5 As shown in the example, control resource set #1, 5-01 can be configured to control the duration of a resource set with 2 symbols, and control resource set #2, 5-02 can be configured to control the duration of a resource set with 1 symbol.

[0105] Figure 5This is a diagram illustrating an example of a control resource set (CORESET) for transmitting downlink control channels in a 5G wireless communication system.

[0106] In the aforementioned 5G system, control resources can be configured to the UE by the base station via higher-level signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). To configure the control resource set to the UE, the device provides information such as the control resource set identifier, the frequency location of the control resource set, and the symbol length of the control resource set. For example, the information provided for configuring the control resource set is as follows.

[0107] [Table 6]

[0108]

[0109]

[0110] In 5G systems, the control resource set can be configured with N frequencies on the frequency axis. RB CORESET There are N RBs, and they can be configured on the time axis by N. symb CORESET ∈{1, 2, 3} symbols. A CCE can be configured with 6 REGs, and a REG can be defined as 1 RB during 1 OFDM symbol. In a control resource set, REGs can be indexed in time priority order, starting from REG index 0 of the lowest RB (first OFDM symbol) of the control resource set.

[0111] 5G systems support interleaving and non-interleaving schemes for PDCCH transmission methods. Base stations can be configured to send interleaved or non-interleaved transmissions to the UE via higher-layer signaling for each control resource set. Interleaving can be performed on a REG packet basis. A REG packet can be defined as a set of one or more REGs. The UE can determine the CCE-to-REG mapping method in the corresponding control resource set based on whether to send interleaved or non-interleaved transmissions configured from the base station, in the following manner.

[0112] [Table 7]

[0113]

[0114]

[0115] All regions mapped by the REs in the DCI and the demodulation reference signal (DMRS) used as the reference signal for decoding the REs (which can be used interchangeably with the reference signal) can be included in the basic unit of the downlink control channel, i.e., the REG. Three DMRS REs can be included in one REG. Depending on the aggregation level (AL), the number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8, or 16, and different numbers of CCEs can be used to implement link adaptation of the downlink control channel. For example, in the case of AL=L, a downlink control channel can be transmitted through L CCEs.

[0116] The UE needs to detect signals without knowing information on the downlink control channel, and for blind decoding, a search space is defined indicating a set of CCEs. The search space is a set of downlink control channel candidates consisting of CCEs, where the UE should attempt decoding at a given aggregation level. Since there are various aggregation levels that form a packet with 1, 2, 4, 8, or 16 CCEs, the UE can have multiple search spaces. The set of search spaces can be defined as a set of search spaces among all configured aggregation levels.

[0117] The search space can be categorized into a common search space and a UE-specific search space. A group of UEs or all UEs can check the common search space of the PDCCH to receive cell common control information, such as paging messages or dynamic scheduling of system information. For example, a UE can check the common search space of the PDCCH to receive PDSCH scheduling allocation information for SIB transmissions, including cell operator information. In the case of a common search space, since a group of UEs or all UEs are required to receive the PDCCH, the common search space can be defined as a set of pre-agreed CCEs. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by checking the UE-specific search space of the PDCCH. The UE-specific search space can be UE-specifically defined as a function of the UE's identifier and various system parameters.

[0118] In 5G systems, parameters for the search space used for PDCCH can be configured from the base station to the UE via higher-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates in each aggregation level L, the monitoring period of the search space, the monitoring timing in the search space time slots (symbol-based), the search space type (common search space or UE-specific search space), the combination of RNTI and DCI formats to be monitored in the corresponding search space, and the control resource set index used to monitor the search space. For example, the parameters for the search space used for PDCCH may include the following information.

[0119] [Table 8]

[0120]

[0121]

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

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

[0124] In the public search space, combinations of the following DCI formats and RNTI can be monitored. This disclosure is not limited to the following embodiments.

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

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

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

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

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

[0130] Within the UE-specific search space, combinations of the following DCI formats and RNTI can be monitored. This disclosure is not limited to the following embodiments.

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

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

[0133] The specified RNTI can follow the following definitions and uses.

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

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

[0136] CS-RNTI (Configured Scheduling RNTI): UE-specific PDSCH scheduling for semi-static configuration.

[0137] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access step.

[0138] P-RNTI (Paging RNTI): Used to schedule the PDSCH that sends paging requests.

[0139] SI-RNTI (System Information RNTI): Used to schedule the PDSCH that sends system information.

[0140] INT-RNTI (Interrupt RNTI): Used to indicate whether PDSCH has been truncated.

[0141] TPC-PUSCH-RNTI (PUSCH RNTI transmit power control): Used to indicate the power control command for PUSCH.

[0142] TPC-PUCCH-RNTI (PUCCH RNTI transmit power control): Used to indicate the power control commands for the PUCCH.

[0143] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0144] The DCI format specified above can follow the following definition.

[0145] [Table 9]

[0146]

[0147] In a 5G system, the search space of the aggregation level L in the control resource set p and the search space set s can be represented by the following equation.

[0148] [Equation 1]

[0149]

[0150] -L: Aggregation level

[0151] -n CI Carrier index

[0152] -N CCE，p : The total number of CCEs existing in the control resource set p

[0153] -n μ s，f Time slot index

[0154] -M (L) p，s，max Number of PDCCH candidates at aggregation level L

[0155] -m snCI =0, ..., M(L)p,s,max-1: PDCCH candidate indexes for aggregation level L

[0156] -i = 0, ..., L-1

[0157] - A0=39827, A1=39829, A2=39839, D=65537

[0158] -n RNTI UE identifier

[0159] In the context of a public search space, Y_(p,n) μ s，f The value can correspond to 0.

[0160] Y_(p,n μ s，f The value can correspond to a value that changes based on the UE's identifier (C-RNTI or ID configured for the UE by the base station) and time index within the UE's specific search space.

[0161] The following describes in detail a method for configuring a Transport Configuration Indicator (TCI) state, which is an apparatus for indicating or exchanging Quasi-Co-location (QCL) information between a UE and a base station in a 5G communication system.

[0162] The base station can configure and indicate the TCI state between two different RSs or channels through appropriate signaling to inform the QCL relationship between the different RSs or channels. The fact that the different RSs or channels are quasi-co-located means that when the UE estimates the channel through a reference RS antenna port A (reference RS#A) and another target RS antenna port B (target RS#B) in the QCL relationship, some or all of the large-scale channel parameters estimated in antenna port A will be applied to the channel measurement from antenna port B. QCL may be needed to associate different parameters based on conditions such as: 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Therefore, NR supports four types of QCL relationships, as shown in Table 10.

[0163] [Table 10]

[0164] A Doppler frequency shift, Doppler spread, average delay, delay spread B Doppler shift C Doppler frequency shift average delay D Spatial Rx parameters

[0165] Spatial Rx parameters can be collectively referred to as some or all of various parameters, such as angle of arrival (AoA), power angle spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit and receive channel correlation, transmit and receive beamforming, and spatial channel correlation.

[0166] QCL relationships can be configured to the UE via the RRC parameters TCI-state and QCL-Info, as shown in Table 11. Referring to Table 11, the base station can configure one or more TCI states to the UE to notify the UE of the maximum two QCL relationships (qc1-Type1, qc1-Type2) of the RS, i.e., the ID of the target RS's reference TCI state. In this case, each QCL information (QCL-Info) included in each TCI state includes the serving cell index and BWP index of the reference RS indicated by the QCL information, the type and ID of the reference RS, and the QCL type, as shown in Table 10.

[0167] [Table 11]

[0168]

[0169]

[0170] The following section describes in detail the method for configuring SpatialRelationInfo, which is a means for indicating uplink beam information between a UE and a base station in a 5G communication system.

[0171] The base station can establish a relationship between another downlink channel or signal, or uplink channel or signal B (including ReferenceSignal in the SpatialRelationInfo configuration), and uplink channel or signal A (the channel or signal involved in SpatialRelationInfo) via appropriate signaling (SpatialRelationInfo). Based on this, the UE uses the same beam direction used for receiving or transmitting channel or signal B to transmit channel or signal A.

[0172] The composition of SpatialRelationInfo can vary depending on the type of uplink channel or signal involved. For example, in the case of SpatialRelationInfo referenced by a PUCCH resource, as in the example in Table 11-1, in addition to the ReferenceSignal information used for PUCCH transmission beam determination, SpatialRelationInfo may include additional information (e.g., Puch-PathlossReferenceRS-Id, p0-PUCCH-Id, closedLoopIndex, etc.) for PUCCH transmission power determination. Similarly, Table 11-2 shows an example configuration of SpatialRelationInfo referenced by an SRS resource.

[0173] [Table 11-1]

[0174]

[0175]

[0176] [Table 11-2]

[0177]

[0178]

[0179] In the above description, it has been stated that the TCI state is used for beam indication of the downlink channel (indicating the UE's receive spatial filter value / type), and SpatialRelationInfo is used for beam indication of the uplink channel (indicating the UE's transmit spatial filter value / type). However, it should be noted that this does not imply a limitation based on the types of uplink and downlink, and mutual extension is possible in the future. For example, the conventional downlink TCI state (DL TCI state) can be extended to the uplink TCI state (UL TCI state) by adding the uplink channel or signal to the type of the target RS that can involve the TCI state, or by adding the uplink channel or signal to the type of the reference signal (reference RS) included in the TCI state or QCL-Info. Furthermore, various extension methods exist, such as the DL-UL joint TCI state, but not all methods are described to avoid obscuring the key points of the description.

[0180] The following section describes a method for allocating time and frequency resources for data transmission in NR.

[0181] In NR, in addition to the frequency domain resource candidate allocation indicated by BWP, the following detailed frequency domain resource allocation (FD-RA) methods are also available.

[0182] Figure 6 This is a diagram illustrating an example of PDSCH frequency domain resource allocation in a wireless communication system according to an embodiment of the present disclosure.

[0183] Figure 6 This diagram illustrates three frequency domain resource allocation methods that can be configured through higher layers in NR: Type 0, 6-00, Type 1, 6-05, and dynamically switched 6-10.

[0184] refer to Figure 6 When the UE is configured to use resource type 0 only via higher-layer signaling (6-00), some downlink control information (DCI) allocated to the UE via PDSCH has a bitmap configured with NRBG bits. The conditions for this situation will be described again later. In this case, NRBG refers to the number of resource block groups (RBGs) determined by the BWP size allocated by the BWP indicator and the upper-layer parameter rbg-Size, and data is transmitted from the RBG indicated by the bitmap as 1.

[0185] [Table 12]

[0186] 1-36 2 4 37-72 4 8 73-144 8 16 145-275 16 16

[0187] When the UE is configured to use resource type 1 only via higher-layer signaling (6-05), some DCIs used to allocate PDSCH to the UE are configured to have Single-digit frequency domain resource allocation information. The conditions for this situation will be described again later. Thus, the base station can configure the starting VRB 6-20 and the length of the frequency axis resources continuously allocated from it.

[0188] When the UE is configured to use resource type 0 and resource type 1 via higher-layer signaling (6-10), some DCIs used to allocate PDSCH to the UE have frequency domain resource allocation information configured with a large value of 6-35 bits for the payload 6-15 used to configure resource type 0 and for the payloads 6-20 and 6-25 used to configure resource type 1. The conditions for this situation will be described again later. In this case, a bit can be added to the first front part (MSB) of the frequency domain resource allocation information within the DCI, and when this bit is 0, it can indicate that resource type 0 is used, and when this bit is 1, it can indicate that resource type 1 is used.

[0189] Figure 7 This is a diagram illustrating an example of physical downlink shared channel (PDSCH) time axis resource allocation in a wireless communication system according to an embodiment of the present disclosure.

[0190] refer to Figure 7 The base station can indicate the time axis position of the PDSCH resource based on the subcarrier spacing (SCS) (μPDSCH, μPDCCH) of the data channel and control channel. The data channel and control channel are configured using a higher layer, scheduling offset K0 value, OFDM symbol start position 7-00, and length 7-05 within a time slot 7-10 dynamically indicated by DCI.

[0191] Figure 8 This is a diagram illustrating an example of time-axis resource allocation based on subcarrier intervals of data channels and control channels in a wireless communication system according to an embodiment of the present disclosure.

[0192] refer to Figure 8 When the subcarrier spacing of the data channel and control channel is the same (8-00, μPDSCH = μPDCCH), the time slot numbers of the data channel and control channel are the same; therefore, the base station and UE can identify the scheduling offset based on the predetermined time slot offset K0. However, when the subcarrier spacing of the data channel and control channel is different (8-05, μPDSCH ≠ μPDCCH), because the time slot numbers of the data channel and control channel are different, the base station and UE can identify the scheduling offset based on the subcarrier spacing of the PDCCH according to the predetermined time slot offset K0.

[0193] exist Figure 8 An offset analysis method for cases where the subcarrier spacing between the data channel and the control channel is the same or different has been described. However, the method is not limited to this, and similarly, it can even be applied to cases where the subcarrier spacing of different channels or reference signals is the same or different, such as the subcarrier spacing between the CSI-RS and the control channel or the subcarrier spacing between the SRS and the control channel is different.

[0194] In NR, various types of DCI formats are provided, as shown in Table 9, depending on the purpose of the UE's effective control channel reception.

[0195] For example, a base station can use DCI format 0_0 or DCI format 0_1 ​​to schedule PDSCH to a cell.

[0196] When DCI format 0_1 ​​is sent together with a CRC scrambled by the Cell Radio Network Temporary Identifier (C-RNTI), the configured scheduling RNTI (CS-RNTI), or a new RNTI, it includes at least the following information:

[0197] - Identifier for DCI format (1 bit): Always configure the DCI format indicator to 1.

[0198] -Frequency domain resource allocation (N) RBG bit or (bit): Indicates frequency domain resource allocation. When monitoring DCI format 1_0 in a specific UE search space. It is the size of the active DL BWP, otherwise, This is the initial DL BWP size. N RBG This refers to the number of resource block groups. The detailed method refers to frequency domain resource allocation.

[0199] - Time-domain resource allocation (0-4 bits): Indicates the time axis resource allocation as described above.

[0200] -VRB to PRB mapping (1 bit): When VRB to PRB mapping is 0, VRB to PRB mapping indicates a non-interleaved VRP to PRB mapping, and when VRB to PRB mapping is 1, VRB to PRB mapping indicates an interleaved VRP to PRB mapping.

[0201] - Modulation and coding scheme (5 bits): Indicates the modulation sequence and coding rate used for PDSCH transmission.

[0202] - New Data Indicator (1 bit): Indicates whether the PDSCH is an initial transmission or a retransmission, depending on whether a switch has been made.

[0203] - Redundancy version (2 bits): Indicates the redundant version used for PDSCH transmission.

[0204] - HARQ process number (4 bits): Indicates the HARQ process number used for PDSCH transmission.

[0205] - Downlink Allocation Index (2 bits): DAI Indicator

[0206] - TPC commands (2 bits) for scheduled PUCCH: PUCCH power control indicator

[0207] -PUCCH Resource Indicator (3 bits): It is the PUCCH resource indicator and indicates one of eight resources configured by the higher layer.

[0208] -PDSCH to HARQ_feedback timing indicator (3 bits): This is the HARQ feedback timing indicator and indicates one of eight feedback timing offsets configured by the upper layer.

[0209] DCI format 1_1, when sent together with a CRC scrambled by the Cell Radio Network Temporary Identifier (C-RNTI), the configured scheduling RNTI (CS-RNTI), or a new RNTI, includes at least the following information:

[0210] - DCI format identifier (1 bit): Always configured to 1 by the DCI format indicator.

[0211] - Carrier indicator (0 or 3 bits): Indicates the CC (or cell) to which the PDSCH allocated by the corresponding DCI is sent.

[0212] - Bandwidth Part Indicator (0, 1, or 2 bits): Indicates the BWP in which the PDSCH allocated by the corresponding DCI is transmitted.

[0213] - Frequency domain resource allocation (determining payload based on frequency domain resource allocation): Indicates frequency domain resource allocation, and This refers to the size of the active DL BWP. The detailed method refers to frequency domain resource allocation.

[0214] - Time-domain resource allocation (bits 0-4): Indicates the time-axis resource allocation as described above.

[0215] -VRB to PRB mapping (0 or 1 bit): When VRB to PRB mapping is 0, it indicates a non-interleaved VRB to PRB mapping; when it is 1, it indicates an interleaved VRB to PRB mapping. VRB to PRB mapping is 0 bits when the frequency domain resource allocation is configured for resource type 0.

[0216] -PRB packet size indicator (0 or 1 bit): It is 0 bits when the upper-level parameter prb-BundlingType is not configured or is configured as "static", and 1 bit when the upper-level parameter prb-BundlingType is configured as "dynamic".

[0217] - Rate Matching Indicator (0, 1, or 2 bits): Indicates the rate matching mode.

[0218] -ZP CSI-RS trigger (0, 1, or 2 bits): Indicator that triggers non-periodic ZP CSI-RS.

[0219] For transport block 1:

[0220] - Modulation and coding scheme (5 bits): Indicates the modulation sequence and coding rate used for PDSCH transmission.

[0221] - New Data Indicator (1 bit): Indicates whether the PDSCH is an initial transmission or a retransmission, depending on whether a switch has been made.

[0222] - Redundancy version (2 bits): Indicates the redundant version used for PDSCH transmission.

[0223] -For transport block 2:

[0224] - Modulation and coding scheme (5 bits): Indicates the modulation sequence and coding rate used for PDSCH transmission.

[0225] - New Data Indicator (1 bit): Indicates whether the PDSCH is an initial transmission or a retransmission, depending on whether a switch has been made.

[0226] - Redundancy version (2 bits): Indicates the redundant version used for PDSCH transmission.

[0227] - HARQ process number (4 bits): Indicates the HARQ process number used for PDSCH transmission.

[0228] - Downlink Allocation Index (0, 2, or 4 bits): DAI (Downlink Allocation Index) Indicator

[0229] - TPC commands for scheduling PUCCH (2 bits): PUCCH power control indicator

[0230] -PUCCH Resource Indicator (3 bits): It is the PUCCH resource indicator and indicates one of eight resources configured by the higher layer.

[0231] -PDSCH to HARQ_feedback timing indicator (3 bits): This is the HARQ feedback timing indicator and indicates one of eight feedback timing offsets configured by the higher layer.

[0232] - Antenna Port (4-bit, 5-bit, or 6-bit): Indicates the DMRS port and CDM group where there is no data.

[0233] -Transmission Configuration Indicator (0 or 3 bits): TCI indicator.

[0234] -SRS Request (2 or 3 bits): SRS Transmission Request Indicator

[0235] -CBG transmission information (0, 2, 4, 6, or 8 bits): An indicator of whether to transmit a code block group in the allocated PDSCH. 0 indicates no CBG transmission, while 1 indicates CBG transmission.

[0236] -CBG Clear Information (0 or 1 bit): An indicator that shows whether the previous CBG was contaminated. If the CBG Clear Information is 0, it means that the previous CBG may have been contaminated, and if the CBG Clear Information is 1, it means that the CBG Clear Information can be used once a retransmission (combinable) is received.

[0237] -DMRS sequence initialization (0 or 1 bit): DMRS scrambling ID selection indicator

[0238] The maximum number of different-sized DCIs that a UE can receive in each time slot of the corresponding cell is 4. The maximum number of different-sized DCIs scrambled with C-RNTI is 3, and the UE can receive this maximum number in each time slot of the corresponding cell.

[0239] Here, the antenna port indication can be indicated by the following [Table 13] to [Table 16].

[0240] [Table 13] Antenna Ports (1000+DMRS Ports), DMRS Type = 1, Maximum Length = 1

[0241]

[0242] [Table 14] Antenna Ports (1000+DMRS Ports), DMRS Type = 1, Maximum Length = 2

[0243]

[0244] [Table 15] Antenna ports (1000+DMRS ports), DMRS type = 2, maximum length = 1

[0245]

[0246] [Table 16-1]: Antenna ports (1000+DMRS ports), DMRS type = 2, maximum length = 2

[0247]

[0248] [Table 16-2]: Antenna ports (1000+DMRS ports), DMRS type = 2, maximum length = 2

[0249]

[0250] It is preferable to interpret [Table 16-1] and [Table 16-2] as connected to each other.

[0251] [Table 13] is used when the DMRS type is indicated as 1 and the maximum length is indicated as 1, while [Table 14] is used when the DMRS type is indicated as 1 and the maximum length is indicated as 2. When the DMRS type is 2 and the maximum length is 1, the port of the DMRS used is indicated based on [Table 15], and when the DMRS type is 2 and the maximum length is 2, the port of the DMRS used is indicated based on [Table 16-1] and [Table 16-2].

[0252] In the table, the numbers 1, 2, and 3, indicated by the number of DMRS CDM groups without data, represent CDM groups {0}, {0, 1}, and {0, 1, 2}, respectively. DMRS ports are formed by sequentially arranging the indices of the ports used. Antenna ports are represented by DMRS port + 1000. The DMRS CDM groups are connected to the methods for generating DMRS sequences and antenna ports, as shown in Tables 17 and 18. [Table 17] shows the parameters when using DMRS type = 1, and [Table 18] shows the parameters when using DMRS type = 2.

[0253] [Table 17] PDSCH DM-RS DMRS type parameter = 1

[0254]

[0255] [Table 18] PDSCH DM-RS DMRS type parameter = 2

[0256]

[0257] The sequence of DMRS for each parameter is determined by Equation 2:

[0258] [Equation 2]

[0259]

[0260]

[0261] k′=0,1

[0262]

[0263] n = 0, 1, ...

[0264] Figure 9 This is a diagram illustrating the radio protocol structure of a base station and a UE when performing single-cell, carrier aggregation, and dual connectivity according to embodiments of the present disclosure.

[0265] refer to Figure 9 The next-generation mobile communication system's wireless protocols are configured with NR Service Data Adaptation Protocol (SDAP) 9-25 and 9-70, NR Packet Data Convergence Protocol (PDCP) 9-30 and 9-65, NR Radio Link Control (RLC) 9-35 and 9-60, and NR Media Access Control (MAC) 9-40 and 9-55 in the UE and base station, respectively.

[0266] The main functions of NR SDAPS 9-25 and 9-70 may include some of the following functions.

[0267] User plane data transmission

[0268] - Mapping between QoS flows and DRB for both DL and UL

[0269] - Mark QoS flow IDs in DL and UL groups

[0270] - Reflective QoS flow for DRB mapping of UL SDAP PDU.

[0271] For SDAP layer devices, the UE can receive headers indicating whether to use SDAP layer device functions for each PDCP layer device, each bearer, or each logical channel with RRC messages. When the SDAP header is configured, the base station can instruct the UE to use the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and AS QoS reflection configuration 1-bit indicator (AS reflective QoS) in the SDAP header to update or reconfigure uplink and downlink QoS flow and mapping information for data bearers. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority and scheduling information to support smooth service.

[0272] The main functions of NR PDCP 9-30 and 9-65 may include some of the following functions.

[0273] -Header compression and decompression: ROHC only

[0274] -Transmit user data

[0275] - Sequential delivery of upper-layer PDUs

[0276] -Disordered delivery of upper-layer PDUs

[0277] - Reordering of received PDCP PDUs

[0278] -Duplicate detection of lower-level SDUs

[0279] -PDCP SDU retransmission

[0280] - Encryption and decryption

[0281] - Timer-based SDU dropping in the uplink.

[0282] In the above description, the reordering of NR PDCP devices refers to reordering PDCP PDUs received from lower layers in sequence based on PDCP sequence numbers (SNs). Reordering may include functions such as transmitting data to higher layers in the reordered order, transmitting data directly without considering the order, reordering PDCP PDUs in sequence and recording lost PDCP PDUs, sending status reports of lost PDCP PDUs to the transmitting side, and requesting retransmission of lost PDCP PDUs.

[0283] The main functions of NR RLC 9-35 and 9-60 may include some of the following functions.

[0284] -Transmission of upper-layer PDUs

[0285] - Sequential delivery of upper-layer PDUs

[0286] -Disordered delivery of upper-layer PDUs

[0287] -Error correction via ARQ

[0288] Cascading, segmentation, and reassembly of RLC SDUs

[0289] - Resegmentation of RLC data PDUs

[0290] - Reordering of RLC data PDUs

[0291] -Duplicate detection

[0292] -Protocol error detection

[0293] -RLC SDU discard

[0294] -RLC Reconstruction

[0295] In the above description, sequential delivery of NR RLC devices refers to the function of sequentially delivering RLC SDUs received from lower layers to upper layers. When an RLC SDU is initially divided into several RLC SDUs and received, sequential delivery may include functions such as reassembling and delivering received RLC PDUs, reordering received RLC PDUs based on RLC sequence number (SN) or PDCP sequence number (SN), reordering the order of received RLC PDUs to record lost RLC PDUs, performing status reports of lost RLC PDUs to the transmitting side, and requesting retransmission of lost RLC PDUs. Furthermore, in the presence of lost RLC SDUs, sequential delivery may include the function of transmitting RLC SDUs to higher layers only in order before the lost RLC SDUs. Even if lost RLC SDUs exist, if a predetermined timer has expired, sequential delivery may include the function of sequentially delivering all RLC SDUs received before the timer started to the upper layer. Alternatively, even if lost RLC SDUs exist, if a predetermined timer has expired, sequential delivery may include sequentially delivering all RLC SDUs received to date. The function of delivering SDUs to higher layers. Furthermore, as described above, RLC PDUs can be processed in the order they are received (in an arrival order independent of sequence number and order number) and transmitted to the PDCP device. If the received RLC PDU is fragmented, segments stored in a buffer or to be received later can be received, reconfigured into a complete RLC PDU, processed, and transmitted to the PDCP device. The NRRLC layer may not include cascading functionality, and this functionality can be implemented in the NR MAC layer, or replaced by multiplexing functionality of the NR MAC layer.

[0296] In the above description, out-of-order delivery of NR RLC devices refers to the function of directly delivering RLC SDUs received from lower layers to higher layers regardless of the order. In cases where an RLC SDU is initially divided into several RLC SDUs and received, out-of-order delivery may include the function of reassembling and delivering several RLC SDUs, as well as the function of storing the RLC SN or PDCP SN of the received RLC PDUs and recording lost RLCs by aligning the order.

[0297] NR MAC 9-40 and 9-55 can connect to several NR RLC layer devices configured in a UE, and the main functions of NR MAC can include some of the following functions.

[0298] Mapping between logical channels and transport channels

[0299] - MAC SDU multiplexing / demultiplexing

[0300] - Scheduling Information Report

[0301] - Error correction via HARQ

[0302] Priority processing between logical channels of a UE

[0303] - Prioritization among UEs is performed through dynamic scheduling.

[0304] -MBMS service identifier

[0305] -Transmission format selection

[0306] -filling

[0307] NR PHY layers 9-45 and 9-50 can perform the following actions: channel coding and modulation of upper-layer data, converting upper-layer data into OFDM symbols, transmitting OFDM symbols via radio channels, or demodulating and channel decoding OFDM symbols received via radio channels and passing OFDM symbols to higher layers.

[0308] The detailed structure of a radio protocol architecture can vary depending on the carrier (or cell) operation method. For example, when the base station transmits data to the UE based on a single carrier (or cell), the base station and UE use a protocol architecture with a single structure for each layer, as shown in 9-00. However, when the base station transmits data to the UE based on carrier aggregation (CA) using multiple carriers in a single TRP, the base station and UE have a single structure up to RLC, as shown in 9-10, but use a protocol architecture that multiplexes the PHY layer through the MAC layer. As another example, when the base station uses multiple carriers in multiple TRPs to transmit data to the UE based on dual connectivity (DC), the base station and UE have a single structure up to RLC, as shown in 9-20, but use a protocol architecture that multiplexes the PHY layer through the MAC layer.

[0309] In LTE and NR, when connected to a serving base station, the UE has a process of reporting its supported capabilities to the corresponding base station. In the following description, this is referred to as UE capability (reporting). The base station can send a UE capability query message to the UE in a connected state to request a capability report. This message can include a UE capability request for each RAT type of the base station. The request for each RAT type can include frequency band information for requesting the UE's capabilities. Furthermore, the UE capability query message can request multiple RAT types in a single RRC message container, or the base station can include a UE capability query message containing multiple requests for each RAT type and deliver it to the UE. That is, the UE capability query can be repeated multiple times, and the UE can configure corresponding UE capability information messages and report them multiple times. In next-generation mobile communication systems, UE capability requests can be performed for MR-DC, including NR, LTE, and EN-DC. For reference, the UE capability query message is typically initially sent after the UE establishes a connection, but can be requested by the base station under any conditions if necessary.

[0310] In the steps described above, the UE, having received a UE Capability Report Request from the base station, configures its capabilities based on the RAT type and frequency band information requested from the base station. The following section outlines the method for configuring UE capabilities in an NR system.

[0311] When a UE receives a list of LTE and / or NR frequency bands as a UE capability request from a base station, the UE independently configures the frequency band combination (BC)(SA) for EN-DC and NR. That is, the UE configures a BC candidate list for EN-DC and NR SA using FreqBandList based on the frequency bands requested from the base station. Furthermore, the frequency bands have priorities according to the order described in FreqBandList.

[0312] When a base station requests a UE capability report by setting the "eutra-nr-only" flag or the "eutra" flag, the UE completely removes the NR SA BC from the configured BC candidate list. This operation can only occur when the LTE base station (eNB) requests "eutra" capability.

[0313] Subsequently, the UE removes the fallback BC from the candidate BC list configured in the above steps. Here, the fallback BC corresponds to removing the band corresponding to at least one SCell from a superset BC, and since the superset BC may already cover the fallback BC, it can be omitted. This step is also applied to Multiple RAT Dual Connectivity (MR-DC), that is, it is also applied to LTE bands. The remaining BCs after this step constitute the final "candidate BC list".

[0314] The UE selects a BC that matches the requested RAT type from the final "Candidate BC List" and selects the BC for reporting. In this step, the UE configures the supportedBandCombinationList in a predetermined order. That is, the UE configures the BCs to be reported and the UE capabilities according to the pre-configured RAT type order (NR->EUTRA-NR->EUTRA). Furthermore, the UE configures featureSetCombinations for the configured supportedBandCombinationList and configures a "Candidate FeatureSetCombination" list from the candidate BC list. In the candidate BC list, the list of BCs used for fallback (including capabilities of the same or lower level) is removed. The aforementioned "Candidate FeatureSetCombinations" include all feature set combinations for NR and EUTRA-NR BCs and can be obtained from feature set combinations of UE-NR capabilities and UE-MRDC capability containers.

[0315] Furthermore, if the requested RAT type is Eutra-NR and has an impact, then feature set combinations are included in both containers for UE-MRDC capabilities and UE-NR capabilities. However, the NR feature set only includes UE-NR capabilities.

[0316] After configuring UE capabilities, the UE sends a UE capability information message, including the UE capabilities, to the base station. Then, the base station performs scheduling, transmission, and reception management appropriate for the corresponding UE based on the UE capabilities received from the UE.

[0317] The NR supports the Channel State Information Reference Signal (CSI-RS) as a reference signal for the UE's channel state reporting, and each CSI-RS resource configuration configured by a higher layer may include at least the following detailed configuration information. However, the present invention is not limited to the following embodiments.

[0318] -NZP-CSI-RS-Resource ConfigID: The ID of the corresponding CSI-RS resource configuration.

[0319] -NrofPorts: The number of CSI-RS ports included in the CSI-RS resource.

[0320] -CSI-RS-timeConfig: Transmission period and time slot offset for CSI-RS resources

[0321] -CSI-RS-ResourceMapping: OFDM symbol locations in time slots and subcarrier locations in PRBs for CSI-RS resources.

[0322] -CSI-RS-Density: The frequency density of CSI-RS.

[0323] -CDMType: CDM length and CDM RE mode for CSI-RS.

[0324] -CSI-RS-FreqBand: CSI-RS transmission bandwidth and start position

[0325] -Pc: The ratio between PDSCH (Physical Downlink Shared Channel) EPRE (Energy Per RE) and NZP CSI-RS EPRE.

[0326] -Pc-SS: The ratio between SS / PBCH block EPRE and NZP CSI-RS EPRE

[0327] -CSI-RS-ResourceRep: It interacts among NZP CSI-RS resources belonging to a resource set. When CSI-RS-ResourceRep is "ON", the UE applies the same spatial transmission filter to all NZP CSI-RS resources belonging to the resource set (i.e., the UE may assume that the base station uses the same transmission beam). In the following text, the transmission beam can mean a directional transmission signal, which can be used interchangeably with the application of the spatial transmission filter. It can be seen that each NZP CSI-RS resource has the same CSI-RS port number and periodicity. When CSI-RS-ResourceRep is "OFF", the UE may not assume that the same spatial transmission filter is applied to all NZP CSI-RS resources belonging to the resource set (i.e., the UE may not assume that the base station uses the same transmission beam), and the UE may not assume that each NZP CSI-RS resource has the same CSI-RS port number and periodicity.

[0328] According to some embodiments, in NR, the number of CSI-RS ports of one of {1, 2, 4, 8, 12, 16, 24, 32} can be configured as a CSI-RS resource, and NR supports different degrees of freedom depending on the number of CSI-RS ports configured as CSI-RS resources. Table 19 shows the CSI-RS density, CDM length and type, and the start positions of the frequency and time axes of the CSI-RS component RE modes. And the number of frequency axis REs (k') and time axis REs (l') of the CSI-RS component RE mode, which can be configured according to the number of NR CSI-RS ports (X).

[0329] According to some embodiments, the CSI-RS component RE mode is the basic unit constituting the CSI-RS resource, and can be composed of a total number YZ of REs, where (Y = 1 + max(k′)) REs are adjacent on the frequency axis, and (Z = 1 + max(l′)) REs are adjacent on the time axis. Referring to Table 19, NR supports configuring different degrees of freedom of the frequency axis according to the number of CSI-RS ports configured to the CSI-RS resource.

[0330] The UE can receive the CSI-RS RE position indication via CSI-RS-ResourceMapping configured by a higher layer. With CSI-RS at port 1, CSI-RS can be configured in the PRB without subcarrier limitations, and the UE can receive the CSI-RS RE position indication via a 12-bit bitmap. With ports {2, 4, 8, 12, 16, 24, 32} and Y=2, CSI-RS can be configured for every two subcarriers in the PRB, and the UE can receive the CSI-RS RE position indication via a 6-bit bitmap. With four ports and Y=4, CSI-RS can be configured for every four subcarriers in the PRB, and the UE can receive the CSI-RS RE position indication via a 3-bit bitmap. Similarly, in the case of time axis RE positions, the UE can receive the CSI-RS indication via a total of 14 bits of bitmap. In this case, the bitmap length can be changed, as in the frequency position indication (CSI-RS position within a time slot) according to the Z value in Table 19, but the principle is similar to the description above. Therefore, its detailed description will be omitted.

[0331] [Table 19]

[0332]

[0333] As mentioned above, in NR, to provide functions other than CSI measurement, such as rate matching or time / frequency tracking, the base station can configure CSI-RS for the UE. When the reporting settings are configured to use CSI-RS for functions other than CSI-RS measurement, there may be side effects such as UE power being consumed for unnecessary CSI generation or uplink resources being wasted on unnecessary CSI reporting.

[0334] The methods for measuring and reporting channel status in 5G communication systems will be described in detail below.

[0335] Channel state information (CSI) may include channel quality information (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), SS / PBCH block resource indicator (SSBRI), layer indicator (L1), rank indicator (RI), and / or L1 reference signal received power (RSRP). The base station can control the time and frequency resources used for the above CSI measurements and reporting to the UE.

[0336] For the aforementioned CSI measurements and reports, the UE can receive configuration information (CSI-ReportConfig) for N (≥1) CSI reports, configuration information (CSI-ResourceConfig) for M (≥1) RS transmission resources, and one or two trigger states (CSI-AperiodicTriggerStateList, CSI-SemiPersistentOnPUSCH-TriggerStateList) list information via higher-layer signaling.

[0337] The configuration information for the CSI measurements and reporting described above can be described in more detail in Tables 20 to 26 below.

[0338] [Table 20] CSI-ReportConfig

[0339] IE CSI-ReportConfig is used to configure periodic or semi-persistent reports to be sent on the PUCCH of a cell that includes CSI-ReportConfig, or to configure semi-persistent or non-periodic reports to be sent on the PUSCH triggered by a DCI received on a cell that includes CSI-ReportConfig (in which case the cell on which the report is sent is determined by the received DCI). See TS 38.214

[19] , Clause 5.2.1.

[0340] CSI-ReportConfig Information Elements

[0341] --ASN1START

[0342] --TAG-CSI-REPORTCONFIG-START

[0343] CSI-ReportConfig::=SEQUENCE{

[0344] reportConfigId CSI-ReportConfigId,

[0345] carrier ServCellIndex OPTIONAL,--Need S

[0346] resourcesForChannelMeasurement CSI-ResourceConfigId,

[0347] csi-IM-ResourcesForInterference CSI-ResourceConfigId OPTIONAL,--NeedR

[0348] nzp-CSI-RS-ResourcesForInterference CSI-ResourceConfigId OPTIONAL,--Need R

[0349] reportConfigType CHOICE{

[0350] periodic SEQUENCE{

[0351] reportSlotConfig CSI-ReportPeriodicityAndOffset,

[0352] pucch-CSI-ResourceList SEQUENCE(SIZE(1..maxNrofBWPs))OF PUCCH-CSI-Resource

[0353] },

[0354] semiPersistentOnPUCCH SEQUENCE{

[0355] reportSlotConfig CSI-ReportPeriodicityAndOffset,

[0356] pucch-CSI-ResourceList SEQUENCE(SIZE(1..maxNrofBWPs))OF PUCCH-CSI-Resource

[0357] },

[0358] semiPersistentOnPUSCH SEQUENCE{

[0359] reportSlotConfig ENUMERATED{sl5,sl10,sl20,sl40,sl80,sl160,sl320},

[0360] reportSlotOffsetList SEQUENCE(SIZE(1..maxNrofUL-Allocations))OFINTEGER(0..32),

[0361] p0alpha P0-PUSCH-AlphaSetId

[0362] },

[0363] aperiodic SEQUENCE{

[0364] reportSlotOffsetList SEQUENCE(SIZE(1..maxNrofUL-Allocations))OFINTEGER(0..32)

[0365] }

[0366] },

[0367] reportQuantity CHOICE{

[0368] none NULL,

[0369] cri-RI-PMI-CQI NULL,

[0370] cri-RI-i1 NULL,

[0371] cri-RI-i1-CQI SEQUENCE{

[0372] pdsch-BundleSizeForCSI ENUMERATED{n2,n4}OPTIONAL--Need S

[0373] },

[0374] cri-RI-CQI NULL,

[0375] cri-RSRP NULL,

[0376] ssb-Index-RSRP NULL,

[0377] cri-RI-LI-PMI-CQI NULL

[0378] },

[0379] reportFreqConfiguration SEQUENCE{

[0380] cqi-FormatIndicator ENUMERATED{widebandCQI,subbandCQI}OPTIONAL,--NeedR

[0381] pmi-FormatIndicator ENUMERATED{widebandPMI,subbandPMI}OPTIONAL,--NeedR

[0382] csi-ReportingBand CHOICE{

[0383] subbands3 BIT STRING(SIZE(3)),

[0384] subbands4 BIT STRING(SIZE(4)),

[0385] subbands5 BIT STRING(SIZE(5)),

[0386] subbands6 BIT STRING(SIZE(6)),

[0387] subbands7 BIT STRING(SIZE(7)),

[0388] subbands8 BIT STRING(SIZE(8)),

[0389] subbands9 BIT STRING(SIZE(9)),

[0390] subbands10 BIT STRING(SIZE(10)),

[0391] subbands11 BIT STRING(SIZE(11)),

[0392] subbands12 BIT STRING(SIZE(12)),

[0393] subbands13 BIT STRING(SIZE(13)),

[0394] subbands14 BIT STRING(SIZE(14)),

[0395] subbands15 BIT STRING(SIZE(15)),

[0396] subbands16 BIT STRING(SIZE(16)),

[0397] subbands17 BIT STRING(SIZE(17)),

[0398] subbands18 BIT STRING(SIZE(18)),

[0399] ...,

[0400] subbands19-v1530 BIT STRING(SIZE(19))

[0401] }OPTIONAL--Need S

[0402] }OPTIONAL,--Need R

[0403] timeRestrictionForChannelMeasurements ENUMERATED{configured,notConfigured},

[0404] timeRestrictionForInterferenceMeasurements ENUMERATED{configured,notConfigured},

[0405] codebookConfig CodebookConfig OPTIONAL,--Need R

[0406] dummy ENUMERATED{n1,n2}OPTIONAL,--Need R

[0407] groupBasedBeamReporting CHOICE{

[0408] enabled NULL,

[0409] disabled SEQUENCE{

[0410] nrofReportedRS ENUMERATED{n1,n2,n3,n4}OPTIONAL--Need S

[0411] }

[0412] },

[0413] cqi-Table ENUMERATED{table1,table2,table3,spare1}OPTIONAL,--Need R

[0414] subbandSize ENUMERATED{value1,value2},

[0415] non-PMI-PortIndication SEQUENCE(SIZE(1..maxNrofNZP-CSI-RS-ResourcesPerConfig))OF PortIndexFor8Ranks OPTIONAL,--Need R

[0416] ..., [[

[0418] semiPersistentOnPUSCH-v1530 SEQUENCE{

[0419] reportSlotConfig-v1530 ENUMERATED{sl4,sl8,sl16}

[0420] }OPTIONAL--Need R ]]

[0422] }

[0423] CSI-ReportPeriodicityAndOffset::=CHOICE{

[0424] slots4 INTEGER(0..3),

[0425] slots5 INTEGER(0..4),

[0426] slots8 INTEGER(0..7),

[0427] slots10 INTEGER(0..9),

[0428] slots16 INTEGER(0..15),

[0429] slots20 INTEGER(0..19),

[0430] slots40 INTEGER(0..39),

[0431] slots80 INTEGER(0..79),

[0432] slots160 INTEGER(0..159),

[0433] slots320 INTEGER(0..319)

[0434] }

[0435] PUCCH-CSI-Resource::=SEQUENCE{

[0436] uplinkBandwidthPartId BWP-Id,

[0437] pucch-Resource PUCCH-ResourceId

[0438] }

[0439] PortIndexFor8Ranks::=CHOICE{

[0440] portIndex8 SEQUENCE{

[0441] rank1-8 PortIndex8 OPTIONAL,--Need R

[0442] rank2-8 SEQUENCE(SIZE(2))OF PortIndex8 OPTIONAL,--Need R

[0443] rank3-8 SEQUENCE(SIZE(3))OF PortIndex8 OPTIONAL,--Need R

[0444] rank4-8 SEQUENCE(SIZE(4))OF PortIndex8 OPTIONAL,--Need R

[0445] rank5-8 SEQUENCE(SIZE(5))OF PortIndex8 OPTIONAL,--Need R

[0446] rank6-8 SEQUENCE(SIZE(6))OF PortIndex8 OPTIONAL,--Need R

[0447] rank7-8 SEQUENCE(SIZE(7))OF PortIndex8 OPTIONAL,--Need R

[0448] rank8-8 SEQUENCE(SIZE(8))OF PortIndex8 OPTIONAL--Need R

[0449] },

[0450] portIndex4 SEQUENCE{

[0451] rank1-4 PortIndex4 OPTIONAL,--Need R

[0452] rank2-4 SEQUENCE(SIZE(2))OF PortIndex4 OPTIONAL,--Need R

[0453] rank3-4 SEQUENCE(SIZE(3))OF PortIndex4 OPTIONAL,--Need R

[0454] rank4-4 SEQUENCE(SIZE(4))OF PortIndex4 OPTIONAL--Need R

[0455] },

[0456] portIndex2 SEQUENCE{

[0457] rank1-2 PortIndex2 OPTIONAL,--Need R

[0458] rank2-2 SEQUENCE(SIZE(2))OF PortIndex2 OPTIONAL--Need R

[0459] },

[0460] portIndex1 NULL

[0461] }

[0462] PortIndex8::=INTEGER(0..7)

[0463] PortIndex4::=INTEGER(0..3)

[0464] PortIndex2::=INTEGER(0..1)

[0465] --TAG-CSI-REPORTCONFIG-STOP

[0466] --ASN1STOP

[0467]

[0468]

[0469]

[0470]

[0471]

[0472]

[0473]

[0474] [Table 21] CSI-ResourceConfig

[0475] The IE CSI-ResourceConfig defines one or more groups of NZP-CSI-RS-ResourceSet, CSI-IM-ResourceSet, and / or CSI-SSB-ResourceSet.

[0476] CSI-ResourceConfig Information Element

[0477] --ASN1START

[0478] --TAG-CSI-RESOURCECONFIG-START

[0479] CSI-ResourceConfig::=SEQUENCE{

[0480] csi-ResourceConfigId CSI-ResourceConfigId,

[0481] csi-RS-ResourceSetList CHOICE{

[0482] nzp-CSI-RS-SSB SEQUENCE{

[0483] nzp-CSI-RS-ResourceSetList SEQUENCE(SIZE(1..maxNrofNZP-CSI-RS-ResourceSetsPerConfig))OF NZP-CSI-RS-ResourceSetId

[0484] OPTIONAL, --Need R

[0485] csi-SSB-ResourceSetList SEQUENCE(SIZE(1..maxNrofCSI-SSB-ResourceSetsPerConfig))OF CSI-SSB-ResourceSetId

[0486] OPTIONAL--Need R

[0487] },

[0488] csi-IM-ResourceSetList SEQUENCE(SIZE(1..maxNrofCSI-IM-ResourceSetsPerConfig))OF CSI-IM-ResourceSetId

[0489] },

[0490] bwp-Id BWP-Id,

[0491] resourceType ENUMERATED{aperiodic,semiPersistent,periodic}, ...

[0493] }

[0494] --TAG-CSI-RESOURCECONFIG-STOP

[0495] --ASN1STOP

[0496] [Table 22] NZP-CSI-RS-ResourceSet

[0497] The IE NZP-CSI-RS-ResourceSet is a set of non-zero power (NZP) CSI-RS resources (their IDs) and set-specific parameters.

[0498] NZP-CSI-RS-ResourceSet Information Element

[0499] --ASN1START

[0500] --TAG-NZP-CSI-RS-RESOURCESET-START

[0501] NZP-CSI-RS-ResourceSet::=SEQUENCE{

[0502] nzp-CSI-ResourceSetId NZP-CSI-RS-ResourceSetId,

[0503] nzp-CSI-RS-Resources SEQUENCE(SIZE(1..maxNrofNZP-CSI-RS-ResourcesPerSet))OF NZP-CSI-RS-ResourceId,

[0504] repetition ENUMERATED{on,off}OPTIONAL,--Need S

[0505] aperiodicTriggeringOffset INTEGER(0..6)OPTIONAL,--Need S

[0506] trs-Info ENUMERATED{true}OPTIONAL,--Need R ...

[0508] }

[0509] --TAG-NZP-CSI-RS-RESOURCESET-STOP

[0510] --ASN1STOP

[0511]

[0512]

[0513] [Table 23] CSI-SSB-ResourceSet

[0514] The IE CSI-SSB-ResourceSet is used to configure an SS / PBCH block resource set that relates to the SS / PBCH indicated in ServingCell ConfigCommon.

[0515] CSI-SSB-ResourceSet Information Element

[0516] --ASN1START

[0517] --TAG-CSI-SSB-RESOURCESET-START

[0518] CSI-SSB-ResourceSet::=SEQUENCE{

[0519] csi-SSB-ResourceSetId CSI-SSB-ResourceSetId,

[0520] csi-SSB-ResourceList SEQUENCE(SIZE(1..maxNrofCSI-SSB-ResourcePerSet))OF SSB-Index, ...

[0522] }

[0523] --TAG-CSI-SSB-RESOURCESET-STOP

[0524] --ASN1STOP

[0525] [Table 24] CSI-IM Resource Set

[0526] The IE CSI-IM-ResourceSet is used to configure one or more CSI Interference Management (IM) resources (their IDs) and a set of set-specific parameters.

[0527] CSI-IM-ResourceSet Information Element

[0528] --ASN1START

[0529] --TAG-CSI-IM-RESOURCESET-START

[0530] CSI-IM-ResourceSet::=SEQUENCE{

[0531] csi-IM-ResourceSetId CSI-IM-ResourceSetId,

[0532] csi-IM-Resources SEQUENCE(SIZE(1..maxNrofCSI-IM-ResourcesPerSet))OFCSI-IM-ResourceId, ...

[0534] }

[0535] --TAG-CSI-IM-RESOURCESET-STOP

[0536] --ASN1STOP

[0537]

[0538] [Table 25]CSI-AperiodicTriggerStateList

[0539] The CSI-AperiodicTriggerStateList IE is used to configure an aperiodic trigger state list for the UE. Each code point in the DCI field "CSI Request" is associated with a trigger state. Upon receiving a value associated with a trigger state, the UE will perform CSI-RS (reference signal) measurements and aperiodic reporting on L1 based on all entries in the associated reportConfigInfoList for that trigger state.

[0540] CSI-AperiodicTriggerStateList Information Element

[0541] --ASN1START

[0542] --TAG-CSI-APERIODICTRIGGERSTATELIST-START

[0543] CSI-AperiodicTriggerStateList::=SEQUENCE(SIZE(1..maxNrOfCSI-AperiodicTriggers))OF CSI-AperiodicTriggerState

[0544] CSI-AperiodicTriggerState::=SEQUENCE{

[0545] associatedReportConfigInfoList SEQUENCE(SIZE(1..maxNrofReportConfigPerAperiodicTrigger))OF CSI-AssociatedReportConfigInfo, ...

[0547] }

[0548] CSI-AssociatedReportConfigInfo::=SEQUENCE{

[0549] reportConfigId CSI-ReportConfigId,

[0550] resourcesForChannel CHOICE{

[0551] nzp-CSI-RS SEQUENCE{

[0552] resourceSet INTEGER(1..maxNrofNZP-CSI-RS-ResourceSetsPerConfig),

[0553] qcl-info SEQUENCE(SIZE(1..maxNrofAP-CSI-RS-ResourcesPerSet))OF TCI-StateId OPTIONAL--Cond Aperiodic

[0554] },

[0555] csi-SSB-ResourceSet INTEGER(1..maxNrofCSI-SSB-ResourceSetsPerConfig)

[0556] },

[0557] csi-IM-ResourcesForInterference INTEGER(1..maxNrofCSI-IM-ResourceSetsPerConfig)OPTIONAL,--Cond CSI-IM-ForInterference

[0558] nzp-CSI-RS-ResourcesForInterference INTEGER(1..maxNrofNZP-CSI-RS-ResourceSetsPerConfig)OPTIONAL,--Cond NZP-CSI-RS-ForInterference ...

[0560] }

[0561] --TAG-CSI-APERIODICTRIGGERSTATELIST-STOP

[0562] --ASN1STOP

[0563]

[0564]

[0565]

[0566]

[0567] [Table 26]CSI-SemiPersistentOnPUSCH-TriggerStateList

[0568] The CSI-SemiPersistentOnPUSCH-TriggerStateList IE is used to configure a trigger state list for the UE for semi-persistent reporting of channel state information about L1. See also Section 5.2 of TS 38.214

[19] .

[0569] CSI-SemiPersistentOnPUSCH-TriggerStateList Information Element

[0570] --ASN1START

[0571] --TAG-CSI-SEMIPERSISTENTONPUSCHTRIGGERSTATELIST-START CSI-SemiPersistentOnPUSCH-TriggerStateList::=SEQUENCE(SIZE(1..maxNrOfSemiPersistentPUSCH-Triggers))OF CSI-SemiPersistentOnPUSCH-TriggerState

[0572] CSI-SemiPersistentOnPUSCH-TriggerState::=SEQUENCE{

[0573] associatedReportConfigInfo CSI-ReportConfigId, ...

[0575] }

[0576] --TAG-CSI-SEMIPERSISTENTONPUSCHTRIGGERSTATELIST-STOP

[0577] --ASN1STOP

[0578] For the CSI report settings (CSI-ReportConfig) mentioned above, each report setting CSI-ReportConfig can be associated with a CSI resource setting associated with the corresponding report setting and with a downlink (DL) bandwidth portion identified by the higher-layer parameter bandwidth portion identifier (BWP-id) given by CSI-ResourceConfig.

[0579] As a time-domain reporting operation used to set CSI-ReportConfig for each report, it supports "aperiodic," "semi-persistent," and "periodic" methods, which can be configured from the base station to the UE via the reportConfigType parameter configured from the upper layer. The semi-persistent CSI reporting method supports "semi-persistent on PUCCH" and "semi-persistent on PUSCH." In the case of periodic or semi-persistent CSI reporting methods, the UE can receive the configuration of the PUCCH or PUSCH resources for transmitting CSI from the base station via higher-layer signaling. The period and slot offset of the PUCCH or PUSCH resources for transmitting CSI can be given based on the parameter set of the uplink (UL) bandwidth portion configured to transmit CSI reports. In the case of aperiodic CSI reporting methods, the UE can receive the scheduling of the PUSCH resources for transmitting CSI from the base station via L1 signaling (DCI, e.g., DCI format 0_1 ​​described above).

[0580] For the CSI resource settings (CSI-ResourceConfig) described above, each CSI resource setting (CSI-ReportConfig) can include S (≥1) CSI resource sets (configured by the higher-layer parameter csi-RS-ResourceSetList). The CSI resource set list can be configured with non-zero power (NZP) CSI-RS resource sets and SS / PBCH block sets, or it can be configured with CSI interference measurement (CSI-IM) resource sets. Each CSI resource setting can reside in a downlink (DL) bandwidth portion identified by the higher-layer parameter BWP-id, and the CSI resource setting can be connected to a CSI reporting setting in the same downlink bandwidth portion. The time-domain operation of the CSI-RS resources in the CSI resource setting can be configured as one of "aperiodic," "periodic," or "semi-persistent" from the resource type of the higher-layer parameter. For periodic or semi-persistent CSI resource settings, the number of CSI-RS resource sets can be limited to S = 1, and the configured period and slot offset can be given based on the parameter set of the downlink bandwidth portion identified by BWP-id. The UE can receive configurations for one or more CSI resource settings for channel or interference measurements from the base station via higher-layer signaling, including, for example, the following CSI resources.

[0581] - CSI-IM resources for interference measurement

[0582] - NZP CSI-RS resources for interference measurement

[0583] - NZP CSI-RS resources for channel measurements

[0584] For a CSI-RS resource set associated with a resource setting whose upper-layer parameter resource type is configured as "aperiodic", "periodic", or "semi-persistent", the trigger state of a CSI report setting with the report type configured as "aperiodic" and the resource setting for channel or interference measurements for one or more constituent cells (CCs) can be configured as the higher-layer parameter CSI-AperiodicTriggerStateList.

[0585] PUSCH can be used to perform aperiodic CSI reporting for the UE, PUCCH can be used to perform periodic CSI reporting, and when semi-persistent CSI reporting is triggered or activated via DCI, PUCCH can be used to perform semi-persistent CSI reporting after activation using PUSCH and the MAC control element (MACCE). As mentioned above, CSI resource settings can also be configured aperiodicly, periodically, or semi-persistently. Combinations between CSI reporting settings and CSI resource configurations can be supported based on Table 27.

[0586] [Table 27]

[0587] Table 5.2.1.4-1: Triggering / activation of CSI reports for possible CSI-RS configurations.

[0588]

[0589]

[0590] Aperiodic CSI reporting can be triggered by the "CSI Request" field of DCI format 0_1 ​​corresponding to the scheduling DCI used for PUSCH. The UE can monitor the PDCCH, obtain DCI format 0_1, and obtain the scheduling information and CSI request indicator for PUSCH. The CSI request indicator can be configured with NTS (=0, 1, 2, 3, 4, 5, or 6) bits, and the number of bits in the CSI request indicator can be determined by higher-layer signaling (reportTriggerSize). One of one or more aperiodic CSI reporting trigger states, which can be configured by higher-layer signaling (CSI-AperiodicTriggerStateList), can be triggered by the CSI request indicator.

[0591] - If all bits in the CSI request field are 0, this may mean that no CSI report is requested.

[0592] - If the number (M) of CSI trigger states in the configured CSI-AperiodTriggerStateLite is greater than 2 NTs -1, then according to the predetermined mapping relationship, M CSI trigger states can be mapped to 2 NTs -1, and can be indicated by the CSI request field as 2. NTs -1 trigger state among trigger states.

[0593] - If the number (M) of CSI trigger states in the configured CSI-AperiodTriggerStateLite is less than or equal to 2 NTs If -1, then one of the M CSI trigger states can be indicated by the CSI request field.

[0594] Table 28 shows an example of the relationship between CSI request indicators and the CSI triggering states that can be indicated by the indicators.

[0595] [Table 28]

[0596]

[0597] The UE can measure CSI resources in a CSI-triggered state triggered by the CSI request field, and thereby generate CSIs (including at least one of CQI, PMI, CRI, SSBRI, LI, RI, or L1-RSRP mentioned above). The UE can use a PUSCH scheduled by the corresponding DCI format 0_1 ​​to transmit the acquired CSIs. When one bit of the uplink data indicator (UL-SCH indicator) in DCI format 0_1 ​​is "1", the UE can multiplex the uplink data (UL-SCH) and the acquired CSIs and transmit them to the PUSCH resource scheduled by DCI format 0_1. When one bit of the uplink data indicator (UL-SCH indicator) in DCI format 0_1 ​​is "0", the UE can only map and send CSIs without uplink data (UL-SCH) to the PUSCH resource scheduled by DCI format 0_1.

[0598] During aperiodic CSI reporting, the UE can monitor the PDCCH to obtain DCI format 0_1 ​​and retrieve scheduling information and CSI request information about the PUSCH. The UE can obtain resource information about the CSI-RS to be measured from the received CSI request indicator. The UE can determine whether to measure the CSI-RS resource at which it was transmitted based on the time point of receiving DCI format 0_1 ​​and the CSI resource set configuration (e.g., the parameter (aperiodicTriggeringOffset mentioned above) used in the NZP CSI-RS resource set configuration). More specifically, the UE can receive the offset value X of the parameter aperiodicTriggeringOffset in the NZP-CSI-RS resource set configuration via higher-layer signaling from the base station, and the configured offset value X can represent the offset between the time slot of receiving the DCI that triggers the aperiodic CSI report and the time slot in which the CSI-RS resource is transmitted. For example, the aperiodicTriggeringOffse parameter value and the offset value X can have the mapping relationship described in Table 29.

[0599] [Table 29]

[0600]

[0601] Figure 10 This is a diagram illustrating examples of various operating scenarios of the SRS according to embodiments of the present disclosure.

[0602] refer to Figure 10 The NR system can consider at least three SRS operation scenarios.

[0603] 1) Base station 10-05 is configured with a beam in one direction for UE 12-00 (in this specification, configuring beam / precoding in one direction includes not applying beam / precoding or applying a wide beam (cell coverage or sector coverage)). In the case of periodic SRS or semi-persistent SRS, UE 12-00 transmits SRS according to the transmission period and offset of SRS, and in the case of non-periodic SRS, transmits SRS according to the base station's SRS request (at a predetermined time after the SRS request). In this case, additional information for beam / precoding is not required for SRS.

[0604] 2) Base stations 10-15 and 10-20 can be configured with beams in one or more directions toward UE 10-10, and UE 10-10 can transmit multiple SRS beams formed in one or more directions. For example, such as Figure 12As shown, SRS resource (or port) #0 can be configured to be beamformed to base station 10-15, and SRS resource (or port) #1 can be configured to be beamformed to base station 10-20. In this case, base stations 10-15 and 10-20 need to notify SRS beaming / precoding information and SRS requests, which differs from method 1.

[0605] 3) Base station 10-30 can configure beams in one or more directions toward UE 10-25, and UE 10-25 can transmit multiple SRS beams formed in one or more directions. For example, such as Figure 12 As shown, by applying different beaming / precoding to SRS resources (or ports) #0, #1, and #2, the base station can configure the UE to transmit SRS. Therefore, even with high UE mobility, stable communication can be performed through beaming / precoding diversity. For example, UE 10-25 can provide channel state information to base station 10-30 with SRS #2 at time A, and to base station 10-30 with SRS #0 at time A+Alpha. In this case, base station 10-30 needs to notify not only of the SRS request but also of the SRS beaming / precoding information (unlike method 1).

[0606] The description is based on SRS transmissions, but can be similarly extended to other UL channels and / or RS transmissions, such as PRACH, PUSCH, and PUCCH, and detailed descriptions of all cases will be omitted to avoid obscuring the gist of the invention.

[0607] Figure 11 This is a diagram illustrating the uplink transmission structure of a 5G or NR system according to an embodiment of the present disclosure.

[0608] refer to Figure 11 The basic transmission unit of a 5G or NR system is time slot 11-00, and assuming a general cyclic prefix (CP) length, each time slot can be configured with 14 symbols 11-05, and one symbol can correspond to one UL waveform (CP-OFDM or DFT-S-OFDM) symbol.

[0609] Resource blocks (RBs) 11-10 are resource allocation units that correspond to a time slot in the time domain and can be configured with 12 subcarriers in the frequency domain.

[0610] The uplink structure can be primarily divided into a data area and a control area. Unlike LTE systems, in 5G or NR systems, the control area can be configured and transmitted at any location on the uplink. Here, the data area includes a series of communication resources, including data transmitted to each UE, such as voice and packets, and corresponds to the remaining resources besides the control area in the subframe. The control area includes a series of communication resources for downlink channel quality reports from each UE, for receiving ACK / NACK for downlink signals, uplink scheduling requests, etc.

[0611] The UE can simultaneously transmit control information and its data in both the data and control areas. The UE can periodically transmit SRS symbols within a time slot, which can be the last six symbol periods 11-15, and transmit them based on the frequency domain via a pre-configured SRS transmission band within the UL BWP. However, this is just an example, and the number of symbols capable of transmitting SRS can be extended to another time interval within the time slot (e.g., configuring some symbols from all OFDM symbols in the time slot as SRS resources). When transmitting SRS-capable RBs in the frequency domain, SRS-capable RBs can be transmitted in multiples of 4 RBs, and up to a maximum of 272 RBs.

[0612] Furthermore, in 5G or NR systems, the number N of SRS symbols can be configured to be 1, 2, or 4, and they are transmitted in consecutive symbols. Additionally, 5G or NR systems allow the retransmission of SRS symbols. Specifically, the repetition factor r of an SRS symbol is r ∈ {1, 2, 4}, where it can be configured as r. For example, if one SRS antenna is mapped to one symbol and that one symbol is transmitted, a maximum of four symbols can be retransmitted. Alternatively, four different symbols can be transmitted through four different antenna ports. In this case, because each antenna port is mapped to one symbol, retransmission of SRS symbols is not allowed.

[0613] In the case of LTE and NR, SRS can be configured based on the following higher-level signaling information (or a subset thereof).

[0614] Bandwidth Configuration: Configures SRS bandwidth information. The precision of each code point can be changed based on the uplink system bandwidth (BW) value.

[0615] Subframe Configuration (or Configuration Index): Configures the SRS transmission period and transmission offset. The precise value for each code point can be changed depending on whether it is FDD or TDD.

[0616] ackNackSRS - Simultaneous Transmission: ACK / NACK - Notification whether SRS is being sent simultaneously.

[0617] MaxUpPts: Notifies whether the frequency position of the SRS transmission has been initialized in UpPTS.

[0618] Frequency hopping: It is a 2-bit information that informs the SRS whether to hop frequencies and the hopping location and method.

[0619] Frequency domain location: Informs the frequency domain location of SRS transmission.

[0620] Duration: Whether a periodic SRS was sent.

[0621] Transmit comb: Notifies the comb offset value when sending SRS.

[0622] Cyclic shift: The cyclic shift value is notified during SRS transmission.

[0623] Antenna Ports: Indicates the number of SRS antenna ports used for SRS transmission. In the case of LTE, 1, 2, or 4 ports can be supported.

[0624] The LTE-A system can support periodic and aperiodic SRS transmissions based on the configuration information described above. In addition to the configuration information, the NR system can also use supplementary information, such as SRS resource activation / deactivation signaling, and supports periodic, semi-persistent, and aperiodic SRS transmissions. Depending on the SRS transmission type, for example, whether it is periodic, semi-persistent, or aperiodic SRS transmission, some configuration information can be omitted.

[0625] SRS can be configured with a constant amplitude zero autocorrelation (CAZAC) sequence. The CAZAC sequence constituting each SRS transmitted from several UEs has a different cyclic shift value. Furthermore, the CAZAC sequence generated by cyclic shifting within a CAZAC sequence has the characteristic that its correlation value is zero with sequences having cyclic shift values ​​different from those of each individual CAZAC sequence. Utilizing this characteristic, SRSs simultaneously assigned to the same frequency domain can be classified based on the cyclic shift values ​​of the CAZAC sequences configured by the base station for each SRS.

[0626] The SRS of several UEs can be classified based on frequency location and cyclic shift value. Frequency location can be divided into SRS subband unit allocation or comb teeth. 5G or NR systems can support comb teeth 2 and comb teeth 4. In the case of comb teeth 2, only one SRS can be allocated to an even or odd subcarrier in the SRS subband. In this case, each of the even and odd subcarriers can form a comb tooth.

[0627] Each UE can receive SRS subband allocations based on a tree structure. The UE can perform SRS transitions allocated to each subband at each SRS transmission time point. Therefore, all of the UE's transmission antennas can use the entire uplink data transmission bandwidth to transmit SRS.

[0628] Figure 12 This is a diagram illustrating the structure for assigning SRS to each subband according to an embodiment of the present disclosure.

[0629] Figure 12 An example is shown where the SRS is allocated to each UE by a tree structure configured by the base station when the SRS has a data transmission band corresponding to 40 RBs on a frequency.

[0630] exist Figure 12 In this model, when the level index of the tree structure is b, the highest level (b=0) of the tree structure can be configured with SRS subbands of 40 RB bandwidth. In the second level (b=1), two SRS subbands of 20 RB bandwidth can be generated within the SRS subband of level (b=0). Therefore, two SRS subbands can exist within the entire data transmission band of the second level (b=1). In the third level (b=2), five 4RB SRS subbands are generated within the 20 RB SRS subband of the immediately preceding level (b=1), and a structure with 10 4RB SRS subbands can exist within a single level.

[0631] Depending on the base station configuration, this tree structure can have various levels, SRS subband sizes, and the number of SRS subbands at each level. Here, the number of SRS subbands in layer b generated in a higher-level SRS subband can be defined as N. b And the N of the SRS subband b The index of the number is n b ={0、……N b -1}. For example... Figure 12 As shown, when the subbands of each level are changed in this way, the UE can be assigned to each subband of each level. For example, UE 1, 200 is assigned to the first SRS subband (n1 = 0) of two SRS subbands with a bandwidth of 20RB at level b = 1, and UE 2, 201 and UE 3, 202 can be assigned to the first SRS subband (n2 = 0) and the third SRS subband (n2 = 2) under the second SRS subband, respectively. Through these processes, the UE can transmit SRS simultaneously through multiple component carriers (CCs) and simultaneously transmit SRS in multiple SRS subbands within one CC.

[0632] Specifically, for the above SRS subband configuration, NR supports SRS bandwidth configuration, as shown in Table 30.

[0633] [Table 30]

[0634]

[0635]

[0636] In addition, NR supports SRS frequency hopping based on the values ​​in Table 30, and the detailed process is described after Table 31.

[0637] [Table 31]

[0638]

[0639]

[0640] As mentioned above, 5G or NR UEs support SU-MIMO (single-user) technology and have up to four transmit antennas. Furthermore, NR UEs can simultaneously transmit SRS to multiple CCs or multiple SRS subbands within a CC. Unlike LTE systems, 5G or NR systems support various parameter sets and can configure multiple SRS transmission symbols differently, allowing for repeated transmissions of SRS through a repetition factor.

[0641] Therefore, considering this, it is necessary to count SRS transmissions. SRS transmission counting can be used in various ways. For example, SRS transmission counting can be used to support antenna switching based on SRS transmissions. Specifically, SRS transmission counting can be used to determine at which SRS transmission time point and in which frequency band the SRS corresponding to which antenna was transmitted.

[0642] The rate matching and truncation operations will be described in detail below.

[0643] When the time and frequency resources A for transmitting any symbol sequence A overlap with any time and frequency resources B, considering the region resource C where resources A and B overlap, the transmission and reception operations of channel A can consider rate matching or truncation operations. The specific operations can follow the following.

[0644] Rate matching operation

[0645] - The base station can map and send channel A only to the remaining resource area except for resource C, which corresponds to the area in resource A that overlaps with resource B in the entire resource A used to send symbol sequence A to the UE. For example, if symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the base station can sequentially map and send symbol sequence A to {resource #1, resource #2, resource #4}, which are the remaining resources except for {resource #3} corresponding to resource C in resource A. As a result, the base station can map and send symbol sequence {symbol #1, symbol #2, symbol #3} to {resource #1, resource #2, resource #4} respectively.

[0646] The UE can determine resources A and B based on scheduling information about symbol sequence A from the base station, and thus determine resource C, which is the overlapping area of ​​resources A and B. The UE can receive symbol sequence A, assuming that it is mapped and transmitted in the remaining area excluding resource C within the entire resource A. For example, if symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the UE can assume that symbol sequence A is sequentially mapped to the remaining resources {resource #1, resource #2, resource #4} excluding {resource #3} corresponding to resource C in resource A, and receive symbol sequence A. As a result, the UE can assume that symbol sequence {symbol #1, symbol #2, symbol #3} is mapped and transmitted to {resource #1, resource #2, resource #4} respectively, and perform a series of subsequent reception operations.

[0647] Delete operation

[0648] If there exists a resource C in resource A that overlaps with resource B and is used to send symbol sequence A to the UE, the base station can map symbol sequence A to the entire resource A. However, it can choose not to perform transmission in the resource area corresponding to resource C, and can only transmit the remaining resource areas other than resource C in resource A. For example, if symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the base station can map symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} to resource A {resource #1, resource #2, resource #3, resource #4} respectively, and only transmit the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the remaining resources {resource #1, resource #2, resource #4} other than {resource #3} corresponding to resource C in resource A, and does not transmit {symbol #3} mapped to {resource #3} corresponding to resource C. As a result, the base station can map the symbol sequence {symbol #1, symbol #2, symbol #4} and send it to {resource #1, resource #2, resource #4} respectively.

[0649] The UE can determine resource A and resource B based on scheduling information about symbol sequence A from the base station, and thus determine resource C, which is the area where resources A and resource B overlap. The UE can receive symbol sequence A, assuming that symbol sequence A is mapped to the entire resource A and is only transmitted in the remaining areas of resource A except for resource C. For example, if symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the UE can assume that symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} is mapped to resource A {resource #1, resource #2, resource #3, resource #4} respectively, but does not send {symbol #3} mapped to {resource #3} corresponding to resource C. The UE can also assume that symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to {resource #1, resource #2, resource #4} is mapped and sent, and receives symbol sequence {symbol #1, symbol #2, symbol #4}, where {resource #1, resource #2, resource #4} are the remaining resources other than {resource #3} corresponding to resource C in resource A. As a result, the UE can assume that the symbol sequence {symbol #1, symbol #2, symbol #4} is mapped and sent to {resource #1, resource #2, resource #4} respectively, and execute the subsequent receive operation sequence.

[0650] [Rate matching resource]

[0651] The base station can configure one or more rate matching resources to the UE via higher-layer signaling (e.g., RRC signaling). Rate matching resource configuration information may include time-axis resource allocation information, frequency-axis resource allocation information, and periodic information. In the following text, the bitmap corresponding to the frequency-axis resource allocation information is referred to as the "first bitmap," the bitmap corresponding to the time-axis resource allocation information is referred to as the "second bitmap," and the bitmap corresponding to the periodic information is referred to as the "third bitmap." When all or part of the time and frequency resources of the scheduled data channel overlap with the configured rate matching resources, the base station can rate match and transmit the data channel within the rate matching resource portion, and the UE can assume that the data channel is rate matched within the rate matching resource portion and perform reception and decoding.

[0652] The base station can dynamically notify the UE via DCI whether to perform rate matching on the data channels in the configured rate matching resource portion through additional configuration (corresponding to the "rate matching indicator" in the DCI format above). Specifically, the base station can select some configured rate matching resources, group the selected rate matching resources into rate matching resource groups, and use a bitmap method in the DCI to indicate to the UE whether to perform rate matching on the data channels for each rate matching resource group. For example, when four rate matching resources RMR#1, RMR#2, RMR#3, and RMR#4 are configured, the base station can configure RMG#1 = {RMR#1, RMR#2} and RMG#2 = {RMR#3, RMR#4} as rate matching groups, and the base station can use a bitmap to indicate to the UE whether to use 2 bits in the DCI field to perform rate matching in RMG#1 and RMG#2 respectively. For example, when performing rate matching, the base station can configure each bit as "1", and when not performing rate matching, it can configure each bit as "0".

[0653] 5G systems utilize the method of configuring the aforementioned rate matching resources to the UE to support the granularity of "RB symbol level" and "RE level". More specifically, 5G systems can follow the following configuration methods.

[0654] RB symbol level

[0655] The UE can receive the configuration of up to 4 RateMatchPatterns for each bandwidth portion via upper-layer signaling, and a RateMatchPatterns can include the following.

[0656] - As reserved resources within the bandwidth portion, resources in the time and frequency resource regions configured with the corresponding reserved resources can be included in a combination of RB-level bitmaps and symbol-level bitmaps on the frequency axis. Reserved resources can span one or two time slots. A periodicity and pattern can be additionally configured, where the configured time and frequency domains are repeated using each RB-level and symbol-level bitmap.

[0657] - This may include time-domain and frequency-domain resource regions configured with control resource sets in the bandwidth portion, as well as resource regions corresponding to time-domain patterns configured with search space configurations that repeat the corresponding resource regions.

[0658] RE Level

[0659] The UE can receive the following configuration via higher-layer signaling.

[0660] It can include one or more LTE-CRS-Vshift values ​​(v-shift) and the number of LTE CRS ports (nrofCRS-Ports) as configuration information on the RE (LTE-CRS-ToMatchAround). This RE corresponds to the LTE CRS (cell-specific reference signal or common reference signal) mode, the center subcarrier location information (carrierfreqDL) of the LTE carrier from the reference frequency point (e.g., reference point A), the LTE carrier bandwidth information (carrierBandwidthDL), and the subframe configuration information (mbsfn-SubframConfigList) corresponding to the Multicast-Broadcast Single Frequency Network (MBSFN), etc. The UE can determine the position of the CRS in the NR slot corresponding to the LTE subframe based on the above information.

[0661] It can include configuration information about resource sets within the bandwidth portion that correspond to one or more Zero Power (ZEP) CSI-RS.

[0662] In 5G and subsequent communication systems, despite the increased communication bandwidth and mature antenna integration technology compared to traditional 4G systems, the likelihood of installing four or more transmit or receive antennas in the UE increases. This means that, considering SRS coverage protection such as SRS antenna switching, frequency hopping, and repetition, as well as UE complexity, the number of OFDM symbols used for SRS detection can increase significantly when considering various SRS transmission methods. For example, considering simultaneous operation of SRS antenna switching for 8 ports and frequency hopping consisting of 4 subbands, detection for all channels would require a total of 32 = 4 × 8 OFDM symbols.

[0663] Subsequently, various methods for SRS antenna switching are provided through specific embodiments.

[0664] [First Implementation] UE Capability Signalling

[0665] <Method 1> New Signalling:

[0666] Method 1 is a method as follows: A UE supporting antenna switching, as disclosed in this disclosure, sends an available antenna switching structure to a base station, along with at least one of channel, frequency band, or FR pair information that can use a corresponding structure employing new UE capability signaling. The base station, having received the corresponding information from the UE, can send antenna switching SRS resource configuration information to the UE based on the received information.

[0667] <Method 2> Rewriting existing signaling + new signaling:

[0668] Method 2 is a method as follows: A UE supporting antenna switching, as disclosed in this disclosure, sends an available antenna switching structure to a base station, and at least one of channel, frequency band, or FR pair information using corresponding structures of both existing UE capability signaling and new UE capability signaling. According to Method 2, the UE can update the information by first sending information via existing UE capability signaling and then rewriting all or part of the information sent via existing UE capability signaling using new UE capability signaling. The base station, having received the corresponding information from the UE, can send antenna switching SRS resource configuration information to the UE based on the received information.

[0669] <Method 3> Adding existing signaling + new signaling

[0670] Method 3 is a method as follows: The UE supporting antenna switching as disclosed in this disclosure transmits an available antenna switching structure, and at least one of channel, frequency band, or FR pair information that can use corresponding structures employing both existing UE capability signaling and new UE capability signaling. According to Method 3, the UE can first transmit a portion of the information via existing UE capability signaling, and then separately transmit the remaining information not transmitted via existing UE capability signaling to the base station via new UE capability signaling. The base station, having received the corresponding information from the UE, can send antenna switching SRS resource configuration information to the UE based on the received information.

[0671] In the UE capability signaling according to the first embodiment disclosed by methods 1 to 3, antenna switching configurations (xTxR combinations) that the UE can support for each frequency band can be sent to the base station. The base station can send the SRS resource construction method presented in this disclosure to the UE based on the corresponding information, and use one or more SRS resource construction methods corresponding to one or more antenna switching configuration combinations, and use control channels such as MAC CE and DCI to change or trigger the one or more SRS resource construction methods.

[0672] [Second Embodiment] SRS resource construction method with a PA structure

[0673] <Method 1> Case 1: 1T1R-1T4R for FR1, 1T1R-1T6 / 8R for FR2

[0674] The proposed method 1 is a method for antenna structures as follows: the antenna using FR1 uses a 1T1R to 1T4R structure, and the antenna using FR2 uses a 1T6 / 8R structure. The proposed method 1 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 1 can be used in a UE having the antenna structure shown in FIG. 13A.

[0675] Referring to Figure 13A, in the proposed method 1, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 13A shows a representative example with two ports. To operate the antenna structure shown in Figure 13A, the UE can have switches as shown. As an example, switch 1 has a structure in which the 5G RF for 2 / 3 / 4G and FR1 is connected to the four antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. A switch is a logic element that can be configured with a single element or with a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0676] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to 7 resource sets, and can be constructed based on some of them.

[0677]

[0678] Figure 13B is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0679] Referring to Figure 13B, the base station can form two resource sets to transmit SRS for 5G FR1 or 2 / 3 / 4G respectively. For example, the base station can form set A to transmit SRS through the main antenna of 2 / 3 / 4G, and set B to transmit SRS through the main antenna of 5G FR1. Additional receiving antennas for 2 / 3 / 4G or 5G can form set C. Here, set C has three resources, and each resource can be configured to be transmitted in different symbols within a time slot or in different time slots.

[0680] Based on the above resource configuration, for example, in the case of using 4×4 MIMO in 2 / 3 / 4G, sets A and C are used, and in the case of using 4×4 MIMO in 5G FR1, sets B and C can be used to transmit SRS. Channel information obtained from sets A and B can be used to quickly change the MIMO configuration. In the case of constructing MIMO for FR2, for example, in the case of constructing 8×8 MIMO, resource sets D, E, F, and G can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, and 1T1R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0681] The table for Case 1.

[0682] 28G DEFG DEF DE D NA 2，3.5G NA NA A, B, C NA A 700M, 2M NA NA A, B, C NA B

[0683] <Method 2> Case 2: 1T2R-1T4R for FR1, 1T2R-1T6 / 8R for FR2, with 6 sets.

[0684] The proposed method 2 is a method for antenna structure, wherein the antenna using FR1 uses a 1T1R, 1T2R, and 1T4R structure, and the antenna using FR2 uses a 1T6 / 8R structure. The proposed method 2 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 2 can be used in a UE having the antenna structure shown in FIG. 13A.

[0685] Referring to Figure 13A, in the proposed method 2, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 13A shows a representative example with two ports. To operate the antenna structure shown in Figure 13A, the UE can have switches as shown. As an example, switch 1 has a structure in which the 5G RF for 2 / 3 / 4G and FR1 is connected to the four antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. A switch is a logic element that can be configured with a single element or with a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0686] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structures. The resource structures can be configured based on up to seven resource sets, and constructed based on some of them.

[0687]

[0688] Figure 13C is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0689] Referring to Figure 13C, the base station can form two resource sets to transmit SRS for 5G FR1 or 2 / 3 / 4G respectively. For example, the base station can configure set A to transmit SRS through the main antenna for 2 / 3 / 4G, and set B to transmit SRS through the main antenna for 5G FR1. Additional receiving antennas for 2 / 3 / 4G or 5G can form set C. Here, set C has two resources, and each resource can be configured to be transmitted in different symbols within a time slot or in different time slots.

[0690] Based on the above resource configuration, for example, in the case of using 4×4 MIMO in 2 / 3 / 4G, sets A and C can be used to transmit SRS, while in the case of using 4×4 MIMO in 5G FR1, sets B and C can be used to transmit SRS. Channel information obtained from sets A and B can be used to quickly change the MIMO configuration. In the case of constructing MIMO for FR2, for example, in the case of constructing 8×8 MIMO, resource sets D, E, F, and G can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, 1T1R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0691] The table for case 2.

[0692] 28G DEFG DEF DE D NA 2，3.5G NA NA A, B, C A A 700M, 2M NA NA A, B, C B A

[0693] <Method 3> Case 3: 1T4R for FR1, 1T2R-1T6 / 8R for FR2, with 5 sets

[0694] The proposed method 3 is a method for antenna structure, wherein the antenna using FR1 uses a 1T2R and 1T4R structure, and the antenna using FR2 uses a 1T6 / 8R structure. The proposed method 3 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 3 can be used in a UE having the antenna structure shown in FIG. 13A.

[0695] Referring to Figure 13A, in the proposed method 3, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 13A shows a representative example with two ports. To operate the antenna structure shown in Figure 13A, the UE can have switches as shown. As an example, switch 1 has a structure in which the 5G RF for 2 / 3 / 4G and FR1 is connected to the four antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. A switch is a logic element that can be configured with a single element or with a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0696] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structures. The resource structures can be configured based on up to six resource sets, and can be constructed based on some of them.

[0697]

[0698] Figure 13D is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0699] Referring to Figure 13D, the base station can form two resource sets to transmit SRS for 5G FR1 or 2 / 3 / 4G respectively. For example, the base station can form set A to transmit SRS through the main antenna for 2 / 3 / 4G, and set B to transmit SRS through the main antenna for 5G FR1. Additional receiving antennas for 2 / 3 / 4G or 5G can form set C. Here, set C has two resources, and each resource can be configured to transmit in different symbols within a time slot or in different time slots.

[0700] Based on the above resource configuration, for example, in the case of using 4×4 MIMO in 2 / 3 / 4G, sets A and C can be used to transmit SRS, while in the case of using 4×4 MIMO in 5G FR1, sets B and C can be used to transmit SRS. The MIMO configuration can be quickly changed using channel information obtained from sets A and B. In the case of constructing MIMO for FR2, for example, in the case of constructing 8×8 MIMO, resource sets C, D, E, and F can be used, and resources for 6, 4, and 2 can be constructed, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, 1T1R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can measure the channel for multi-antenna transmission based on this information using the SRS resource configuration method according to the method proposed in this disclosure.

[0701] The table for case 3.

[0702] 28G CDEF CDE CD C NA 700M, 2G, 3.5G NA NA A, B A NA

[0703] <Method 4> Case 4: 1T1R and 1T6R are used for FR1, 1T2R-1T6 / 8R are used for FR2

[0704] The proposed method 4 is a method for antenna structure, wherein the antenna using FR1 uses a 1T1R and 1T6R structure, and the antenna using FR2 uses a 1T6 / 8R structure. The proposed method 4 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 4 can be used in a UE having the antenna structure shown in FIG. 14A.

[0705] Referring to Figure 14A, in the proposed method 4, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 14A shows a representative example with two ports. To operate the antenna structure shown in Figure 14A, the UE can have switches as shown. As an example, switch 1 has a structure in which the RF for 2 / 3 / 4 / 5G FR1 is connected to six antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. Switches are logic elements, which can be composed of individual elements or a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0706] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to 6 resource sets, and can be constructed based on some of them.

[0707]

[0708] Figure 14B is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0709] Referring to Figure 14B, base stations can be configured into two sets to transmit SRS for 2 / 3 / 4 / 5G FR1. For example, base stations can be configured into set A to transmit SRS via the main antenna of 2 / 3 / 4 / 5G FR1, and set B can be configured to transmit SRS via the second main antenna and SRS among the remaining four auxiliary antennas. Here, set B has five resources, and each resource can be configured to be transmitted in different symbols within a time slot or in different time slots, or it can be divided into 1 and 4 to be configured to be transmitted in different time slots.

[0710] Based on the above resource configuration, for example, in the case of using 4×4 MIMO in 2 / 3 / 4 / 5G FR1, sets A and B can be used to transmit SRS. If it is desired to change the MIMO configuration of the base station and UE from 8×6 to 8×1, the channel information obtained from set A can be used to quickly change the MIMO configuration. For example, in the case of constructing 8×8 MIMO, resource sets C, D, E, and F can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, 1T1R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0711] The table for case 4.

[0712] 28G CDEF CDE CD C NA 700M, 2G, 3.5G NA A, B NA NA A

[0713] <Method 5> Case 5: 1T1R-1T6R for FR1, 1T2R-1T6 / 8R for FR2. The proposed Method 5 is a method for antenna structures, wherein the antenna using FR1 uses structures of 1T1R, 1T2R, 1T4R, and 1T6R, and the antenna using FR2 uses structures of 1T2R, 1T4R, and 1T6 / 8R. The proposed Method 5 can be used in UEs with various antenna structures. According to one embodiment, the proposed Method 5 can be used in a UE having the antenna structure shown in Figure 14A.

[0714] Referring to Figure 14A, in the proposed method 5, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 14A shows a representative example with two ports. To operate the antenna structure shown in Figure 14A, the UE can have switches as shown. As an example, switch 1 has a structure in which the RF for 2 / 3 / 4 / 5G FR1 is connected to six antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. Switches are logic elements that can be configured with individual elements or with a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0715] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to eight resource sets, and can be configured based on some of them.

[0716]

[0717] Figure 14C is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0718] Referring to Figure 14C, the base station can be configured with resource sets as follows to transmit SRS for 2 / 3 / 4 / 5G FR1. For example, set A can be configured to transmit SRS via the main antenna of 2 / 3 / 4 / 5G FR1, set B can be configured to transmit SRS via the second main antenna, and sets C and D can be configured to transmit SRS via the remaining two auxiliary antennas, respectively. Here, sets C and D have two resources, and each resource can be configured to be transmitted in different symbols within a time slot or in different time slots.

[0719] Based on the above resource configuration, for example, in the case of using 4×4 MIMO in 2 / 3 / 4 / 5G FR1, sets A, B, and C can be used to transmit SRS. If it is desired to change the MIMO configuration of the base station and UE from 8×6 to 8×1, the channel information obtained from set A can be used to quickly change the MIMO configuration. For example, in the case of constructing 8×8 MIMO, resource sets E, F, G, and H can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, 1T1R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0720] The table for case 5.

[0721] 28G EFGH EFG EF E NA 700M, 2G, 3.5G NA ABCD ABC AB A

[0722] <Method 6> Case 6: 1T2R-1T6R for FR1, 1T2R-1T6 / 8R for FR2. The proposed Method 6 is a method for antenna structures, wherein the antenna using FR1 uses a 1T2R, 1T4R, and 1T6R structure, and the antenna using FR2 uses a 1T2R, 1T4R, and 1T6 / 8R structure. The proposed Method 6 can be used in UEs with various antenna structures. According to one embodiment, the proposed Method 6 can be used in a UE having the antenna structure shown in Figure 14A.

[0723] Referring to Figure 14A, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 14A shows a representative example with two ports. To operate the antenna structure shown in Figure 14A, the UE can have switches as shown. As an example, switch 1 has a structure in which the RF for 2 / 3 / 4 / 5G FR1 is connected to six antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. Switches are logic elements, which can be composed of individual elements or a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0724] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to 7 resource sets, and can be constructed based on some of them.

[0725]

[0726] Figure 14D is a diagram illustrating a resource allocation method according to an embodiment of the present disclosure.

[0727] Referring to Figure 14D, the base stations can be configured into three sets to transmit SRS for 2 / 3 / 4 / 5G FR1. For example, set A can be configured to transmit SRS via the main antenna and auxiliary antennas of 2 / 3 / 4 / 5G FR1, set B can be configured to transmit SRS via a second main antenna and auxiliary antennas, and set C can be configured to transmit SRS via the remaining two auxiliary antennas. Here, sets A, B, and C have two resources, and each resource can be configured to be transmitted in different symbols within a time slot or in different time slots.

[0728] Based on the above resource configuration, for example, in the case of using 4×4 MIMO in 2 / 3 / 4 / 5G FR1, sets A and B can be used to transmit SRS. If it is desired to change the MIMO configuration of the base station and UE from 8×6 to 8×1, the channel information obtained from set A can be used to quickly change the MIMO configuration. For example, in the case of constructing 8×8 MIMO, resource sets D, E, F, and G can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, 1T1R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0729] The table for case 6.

[0730]

[0731] <Method 7> Case 7: 1T2R and 1T6R are used for FR1, 1T2R-1T6 / 8R are used for FR2, with 5 sets.

[0732] The proposed method 7 is a method for antenna structure, wherein the antenna using FR1 uses a 1T2R and 1T6R structure, and the antenna using FR2 uses a 1T2R, 1T4R, and 1T6 / 8R structure. The proposed method 7 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 7 can be used in a UE having the antenna structure shown in FIG. 14A.

[0733] Referring to Figure 14A, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 has ports, which can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 14A shows a representative example with two ports. To operate the antenna structure shown in Figure 14A, the UE can have switches as shown. As an example, switch 1 has a structure in which the RF for 2 / 3 / 4 / 5G FR1 is connected to six antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. Switches are logic elements that can be configured with individual elements or with a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0734] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to 7 resource sets, and can be constructed based on some of them.

[0735]

[0736] Figure 14E is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0737] Referring to Figure 14E, the base stations can be configured into two sets for transmitting SRS for 2 / 3 / 4 / 5G FR1. For example, set A can be configured to transmit SRS via the main antenna and the second main antenna of 2 / 3 / 4 / 5G FR1, and set B can be configured to transmit SRS via the remaining four additional antennas. Here, set B has four resources, and each resource can be configured to be transmitted in different symbols within a time slot or in different time slots.

[0738] Based on the above resource configuration, for example, in the case of using 8×4 MIMO in 2 / 3 / 4 / 5G FR1, SRS can be transmitted using set B, while in the case of using 8×2 MIMO in 2 / 3 / 4 / 5G FR1, SRS can be transmitted using set A. The channel information obtained from set A can be used to quickly change the MIMO configuration. In the case of constructing MIMO for FR2, for example, in the case of constructing 8×8 MIMO, resource sets D, E, F, and G can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R). In the configuration (1T8R, 1T6R, 1T4R, 1T2R), its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0739] The table for case 7.

[0740]

[0741] <Method 8> Case 8: 1T2R / 4R-1T6R is used for FR1, 1T2R-1T6 / 8R is used for FR2

[0742] The proposed method 8 is a method for antenna structure, wherein the antenna using FR1 uses a 1T2R, 1T4R, and 1T6R structure, and the antenna using FR2 uses a 1T2R, 1T4R, and 1T6 / 8R structure. The proposed method 8 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 8 can be used in a UE having the antenna structure shown in FIG. 14A.

[0743] Referring to Figure 14A, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 1T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 1T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 14A shows a representative example with two ports. To operate the antenna structure shown in Figure 14A, the UE can have switches as shown. As an example, switch 1 has a structure in which the RF for 2 / 3 / 4 / 5G FR1 is connected to six antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. Switches are logic elements, which can be composed of individual elements or a single element and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0744] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to 6 resource sets, and can be constructed based on some of them.

[0745]

[0746] Figure 14F is a diagram illustrating a proposed resource construction method according to an embodiment of the present disclosure.

[0747] Referring to Figure 14F, the base stations can be configured into two sets for transmitting SRS for 2 / 3 / 4 / 5G FR1. For example, set A can be configured to transmit SRS via the main antenna and auxiliary antennas of 2 / 3 / 4 / 5G FR1, and set B can be configured to transmit SRS via a second main antenna and the remaining three auxiliary antennas. Here, sets A and B have 2 and 4 resources respectively, and each resource can be configured to be transmitted in different symbols within a time slot or in different time slots.

[0748] Based on the above resource configuration, for example, in the case of using 8×6 MIMO in 2 / 3 / 4 / 5G FR1, sets A and B are used; in the case of using 8×4 MIMO, set B can be used to transmit SRS; and in the case of using 8×2 MIMO in 2 / 3 / 4 / 5G FR1, set B can be used to transmit SRS. Set A can be used to transmit SRS. When it is desired to change the MIMO configuration of the base station and UE to 8×6, 8×4, or 8×2, the channel information obtained from set A can be used to quickly change the MIMO configuration. In the case of constructing MIMO for FR2, for example, in the case of constructing 8×8 MIMO, the resource sets CDEF can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can send information about the configuration (1T8R, 1T6R, 1T4R, 1T2R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource construction method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on the information.

[0749] The table for case 8.

[0750] 28G CDEF CDE CD C NA 3.5G NA AB B A NA

[0751] [Third Embodiment] SRS Resource Construction Method Based on the Structure of Two Pas

[0752] <Method 9> Case 9: 2T2R-2T4R is used for FR1, 2T2R-2T6 / 8R is used for FR2

[0753] The proposed method 9 is a method for antenna structure, wherein the antenna using FR1 uses a 2T2R to 2T4R structure, and the antenna using FR2 uses a 2T2R-2T6 / 8R structure. The proposed method 9 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 9 can be used in a UE having the antenna structure shown in FIG. 15A.

[0754] Referring to Figure 15A, in the proposed method 9, the antenna for FR1 can be used in an antenna structure having antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure having antenna modules with ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 2T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 2T8R structure is assumed to be supported. Furthermore, each antenna module can have L ports, and Figure 15A shows a representative example with two ports. To operate the antenna structure shown in Figure 15A, the UE can have switches as shown. As an example, switch 1 has a structure in which the 5G RF for 2 / 3 / 4G and FR1 is connected to the four antennas in AH, and switch 2 has a structure in which the 5G RF for FR2 is connected to ports 2-1 to 2-4. A switch is a logic element that can be composed of a single component or a single component and an RF signal. The function of a switch is to connect an input RF signal to an output terminal.

[0755] For a UE with the above antenna structure, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to 6 resource sets, and can be constructed based on some of them.

[0756]

[0757] Figure 15B is a diagram illustrating a proposed resource construction method according to an embodiment of the present disclosure.

[0758] Referring to Figure 15B, base stations can be configured in each of two sets to transmit SRS for 5G FR1 or 2 / 3 / 4G. For example, set A can be configured to transmit SRS via the main 2 / 3 / 4G antenna, while set B can be configured to transmit SRS via the main 5G FR1 antenna. Additional receiving antennas for 2 / 3 / 4G or 5G can be used to form set C. Here, set C has a resource, and each resource can be configured to transmit in different symbols within a time slot or in different time slots.

[0759] Based on the above resource configuration, for example, in the case of using 4×4 MIMO, sets A and B can be used to transmit SRS. If it is desired to change the MIMO configuration of the base station and UE from 4×4 to 4×2, the channel information obtained from sets A and B can be used to quickly change the MIMO configuration. For example, in the case of constructing 8×8 MIMO, sets C, D, E, and F can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, 1T1R, or 2T1R-2T8R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0760] Table for Case 9.

[0761] 28G CDEF CDE CD C NA 3.5G NA NA A, B A NA

[0762] <Method 10> Case 10: 2T2R-2T6R is used for FR1, 2T2R-2T6 / 8R is used for FR2

[0763] The proposed method 10 is a method for antenna structure, wherein the antenna using FR1 uses a 2T2R, 2T4R, and 2T6R structure, and the antenna using FR2 uses a 2T2R-2T6 / 8R structure. The proposed method 10 can be used in UEs with various antenna structures. According to one embodiment, in the proposed method 10, the antenna for FR1 shown in FIG. 16A has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 2T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 2T8R structure is assumed to be supported. Furthermore, each antenna module has L ports, and FIG. 16A shows a representative example with two ports. To operate the antenna structure shown in FIG. 16A, the UE can have a switch as shown. As an example, switch 1 is connected to the first PA and six antennas in antenna AH of 2 / 3 / 4 / 5G FR1, switch 2 is connected to the second PA and six antennas in antenna AH of 2 / 3 / 4 / 5G FR1, and switch 3 is connected to two 5G RF ports and ports 2-1 to 2-4 for FR2. Switches are logic elements that can be composed of individual components or a single component and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0764] In this UE architecture, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to seven resource sets, and based on some of them...

[0765]

[0766] Figure 16B is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0767] Referring to Figure 16B, each of the two sets can be configured to transmit SRS for 5G FR1 or 2 / 3 / 4G. For example, set A can be configured to transmit SRS via the main 2 / 3 / 4G antenna, while set B can be configured to transmit SRS via the main 5G FR1 antenna. Additional receiving antennas for 2 / 3 / 4G or 5G can form set C. Here, set C has a resource, and each resource can be configured to transmit in different symbols within a time slot or in different time slots.

[0768] Based on the above resource configuration, for example, in the case of using 8×6 MIMO, sets A and B can be used to transmit SRS. If it is desired to change the MIMO configuration of the base station and UE to 8×2, the channel information obtained from set A can be used to quickly change the MIMO configuration. This applies to both MIMO configuration for FR2 and 8×8 MIMO configurations. Sets D, E, F, and G are used, and resources can be configured for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, or 2T1R-2T8R). In the configuration (1T8R, 1T6R, 1T4R, 1T2R, or 2T1R-2T8R), its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource configuration method according to the method proposed in this disclosure to measure the channel for multi-antenna transmission based on this information.

[0769] The table for case 10.

[0770]

[0771] <Method 11> Case 11: 2T2R and 2T6R are used for FR1, 2T2R-2T6 / 8R are used for FR2

[0772] The proposed method 11 is a method for antenna structure, wherein the antenna using FR1 uses a 2T2R and 2T6R structure, and wherein the antenna using FR2 uses a 2T2R-2T6 / 8R structure. The proposed method 11 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 11 can be used in a UE having the antenna structure shown in FIG. 16A.

[0773] Referring to Figure 16A, in the proposed method 11, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in an antenna structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 2T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 2T8R structure is assumed to be supported. Furthermore, each antenna module has L ports, and Figure 16A shows a representative example with two ports. To operate the antenna structure shown in Figure 16A, the UE can have a switch as shown. As an example, switch 1 is connected to the first PA of 2 / 3 / 4 / 5G FR1 and the six antennas in antenna AH, switch 2 is connected to the second PA of 2 / 3 / 4 / 5G FR1 and the six antennas in antenna AH, and switch 3 is connected to the two 5G RFs for FR2 and ports 2-1 to 4. Switches are logic elements that can be composed of individual components or a single component and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0774] In this UE architecture, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to six resource sets, and can be constructed based on some of them.

[0775]

[0776] Figure 16C is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0777] Referring to Figure 16C, base stations can be configured in each of two sets to transmit SRS for 5G FR1 or 2 / 3 / 4G. For example, set A can be configured to transmit SRS via the main 2 / 3 / 4G antenna, while set B can be configured to transmit SRS via the main 5G FR1 antenna. Additional receive antennas for 2 / 3 / 4G or 5G can be used to form set C. Here, set C has three resources, and each resource can be configured to transmit in different symbols within a time slot or in different time slots.

[0778] Based on the above resource construction, for example, in the case of using 4×4 MIMO, sets A and B can be used to transmit SRS. If it is desired to change the MIMO configuration of the base station and UE from 4×4 to 4×2, the channel information obtained from sets A and B can be used to quickly change the MIMO configuration. Furthermore, in the case of constructing 8×8 MIMO, sets C, D, E, and F can be used, and resources can be constructed for 6, 4, and 2, as shown in the table below. The UE can transmit information about the configuration (1T8R, 1T6R, 1T4R, 1T2R, or 2T1R-2T8R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can use the SRS resource construction method according to the proposed method to measure the channel for multi-antenna transmission based on this information.

[0779] The table for case 11.

[0780] 28G CDEF CDE CD C NA 3.5G NA AB NA A NA

[0781] [Fourth Embodiment] SRS resource construction method based on a structure with 4 PAs

[0782] <Method 12> Case 12: 4T6(8)R antenna structure (4 main antennas and 4 sub-antennas when there are fewer than 6 antennas, and 6(8) main antennas when there are more than 6 antennas)

[0783] The proposed method 12 is a method for antenna structure, wherein the antenna using FR1 uses a 4T4R structure, and the antenna using FR2 uses a 4T2 / 4 / 6 / 8R structure. The proposed method 12 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 12 can be used in a UE having the antenna structure shown in FIG. 17A.

[0784] Referring to Figure 17A, in the proposed method 12, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in a structure of antenna modules with ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 4T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 4T8R structure is assumed to be supported. Furthermore, each antenna module has L ports, and Figure 17A shows a representative example with two ports. To operate the antenna structure shown in Figure 17A, the UE can have a switch as shown. As an example, switch 1 is connected to the two PAs of 2 / 3 / 4 / 5G FR1 and the four antennas in antenna AH, and switch 2 has a structure connected to the four antennas in antenna AH for the remaining two PAs of 2 / 3 / 4 / 5G FR1, and switch 3 has a structure connected to the two 5G RF ports and ports 2-1 to 2-4 for FR2. Switches are logic elements that can be composed of individual components or a single component and RF. The function of a switch is to connect an input RF signal to an output terminal.

[0785] In this UE architecture, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on up to four resource sets, and can be constructed based on some of them.

[0786]

[0787] Figure 17B is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0788] Referring to Figure 17B, base stations can be configured into two sets to transmit SRS for 2 / 3 / 4 / 5G FR1. For example, set A can be configured to transmit SRS via four antennas, including the main antenna for 2 / 3 / 3 / 4 / 5G FR1, and set B can be configured to transmit SRS via the remaining four antennas. Sets C or D can be constructed from two resources of two ports or one resource of four ports to support 5G FR2 SRS transmission. Here, in sets C or D, each resource can be configured to transmit in different symbols within a time slot or in different time slots.

[0789] Based on the above resource configuration, for example, in the case of using 8×4 MIMO, set A or B can be used to transmit SRS. In the case of MIMO for FR2, and in the case of 8×8 MIMO, sets B and D can be used, and the resources can be constructed as shown in the table below for 6, 4, and 2. The UE can transmit information about the construction (1T8R, 1T6R, 1T4R, 1T2R, 2T1R-2T8R, or 4T1R-4T8R), in which its antenna structure can be operated to the base station using combinations with each frequency band, and the base station can measure the channel for multi-antenna transmission based on this information using the SRS resource construction method according to the method proposed in this disclosure.

[0790] The table for case 12.

[0791] 28G D8 BC B C NA 3.5G NA NA A NA NA

[0792] <Method 13> Case 13: 4T6(8)R antenna structure (4 main antennas and 6 sub-antennas when there are fewer than 6 antennas, and 6 (8) main antennas when there are more than 6 antennas)

[0793] The proposed method 13 is a method for antenna structure, wherein the antenna using FR1 uses a 4T6R and 4T4R structure, and the antenna using FR2 uses a 4T2 / 46 / 8R structure. The proposed method 13 can be used in UEs with various antenna structures. According to one embodiment, the proposed method 13 can be used in a UE having the antenna structure shown in FIG. 17A.

[0794] Referring to Figure 17A, the antenna for FR1 has antenna patches A, B, C, D, E, F, G, and H, and the antenna for FR2 can be used in a structure with antenna modules having ports 2-1, 2-2, 2-3, and 2-4. Here, with only ports 2-1, 2-2, and 2-3 present, a 4T6R structure is assumed to be supported, while with ports 2-1, 2-2, 2-3, and 2-4 present, a 4T8R structure is assumed to be supported. Furthermore, each antenna module has L ports, and Figure 17A shows a representative example with two ports. To operate the antenna structure shown in Figure 17A, the UE can have switches as shown. For example, switch 1 is connected to the two PAs of 2 / 3 / 4 / 5G FR1 and the four antennas of antenna AH; switch 2 has a structure connected to antenna AH with the four antennas used in the remaining two PAs of 2 / 3 / 4 / 5G FR1; and switch 3 has a structure connected to the two 5G RFs and ports 2-1 to 2-4 for FR2. A switch is a logic element that can be composed of a single component or a single component and an RF signal. The function of a switch is to connect an input RF signal to an output terminal.

[0795] In this UE architecture, the base station should measure the channel between each RF path and antenna element, and for this purpose, the base station can support the following SRS resource structure. The resource structure can be constructed based on a maximum of 4-5 resource sets, and can be constructed based on some of them.

[0796]

[0797]

[0798] Figure 17C is a diagram illustrating a resource construction method according to an embodiment of the present disclosure.

[0799] Referring to Figure 17C, base stations can be configured to transmit SRS for 2 / 3 / 4 / 5G FR1 using each of sets A1, A2, and B. For example, sets A1 and A2 can be configured to transmit SRS using four antennas, including the main antenna for 2 / 3 / 4 / 5G FR1, and set B can be configured to transmit SRS using the remaining two antennas. Sets C or D can be configured using two resources from two ports or one resource from four ports to support 5G FR2 SRS transmission. Here, in sets C or D, each resource can be configured to transmit in different symbols within a time slot or in different time slots.

[0800] Based on the above resource construction, for example, in the case of using 8×6 MIMO, sets A1 and A2 can be used to transmit SRS. In the case of MIMO for FR2, and in the case of 8×8 MIMO, sets B and D can be used, and resources can be constructed for 8×6, 8×4, and 8×2, as shown in the table below (Case 13). The UE can transmit information about the construction (1T8R, 1T6R, 1T4R, 1T2R, or 2T1R-2T8R, or 4T1R-4T8R), in which its antenna structure can be operated to the base station in combination with each frequency band, and the base station can measure the channel for multi-antenna transmission based on this information using the SRS resource construction method according to the method proposed in this disclosure.

[0801] The table for case 13.

[0802] 28G DB BC B C NA 3.5G NA A1, A2 A1 NA NA

[0803] [Fifth Embodiment] Method for Triggering SRS Antenna Switching

[0804] <Method 1> Per TX Cycle: Method 1 is a method that sequentially cycles through an antenna connected to a PA using a single trigger. According to Method 1, when SRS transmission is triggered by a trigger signal (high-level signaling, PDCCH, or MAC CE), SRS can be transmitted by turning on the first PA and sequentially changing the switches connected to the PA, and then by turning on the second PA and sequentially changing the switches connected to the PA. According to Method 1, power consumption can be reduced by decreasing the number of PA on / off cycles.

[0805] <Method 2> Per-Path Cycle: Method 2 is a method that sequentially cycles through a resource connected to an antenna using a single trigger. According to Method 2, when SRS transmission is triggered by a trigger signal (higher-level signaling, PDCCH, or MAC CE), Method 2 is a method as follows: SRS is transmitted while sequentially changing the connectable PAs via switches connected to the first antenna, and then SRS is transmitted while sequentially changing the connectable PAs via switches connected to the second antenna. According to Method 2, channel information can be quickly obtained using multiple PAs for a single antenna.

[0806] Figure 18 This is a flowchart illustrating the operation of a UE according to an embodiment of the present disclosure.

[0807] refer to Figure 18 The UE can send information to the base station regarding available antenna switching structures, as well as at least one of the following: channels, frequency bands, and FR pairs that can be used with the corresponding structure (1810). According to an embodiment, based on methods 1 to 3 of the first embodiment, antenna switching structure related information can be sent to the base station via UE capability signaling. The base station can configure SRS resources based on the received antenna switching structure related information according to the methods described in the second to fourth embodiments, and the UE can receive antenna switching SRS resource configuration information from the base station (1820). The UE can send SRS to the base station based on the switching SRS resource configuration information received from the base station (1830).

[0808] Figure 19 This is a flowchart illustrating the operation of a base station according to an embodiment of the present disclosure.

[0809] refer to Figure 19The base station can receive information from the UE regarding available antenna switching structures, and at least one of the following: channel, frequency band, or FR pair information for which the corresponding structure can be used (1910). According to one embodiment, based on methods 1 to 3 of the first embodiment, antenna switching structure related information can be sent to the base station via UE capability signaling. The base station can configure SRS resources according to the methods described in the second to fourth embodiments based on the received antenna switching structure related information, and send antenna switching SRS resource configuration information to the UE (1920). The base station can send SRS from the UE based on the switching SRS resource configuration information received by the UE (1930).

[0810] Figure 20 This is a block diagram illustrating the construction of a UE according to an embodiment of the present disclosure.

[0811] refer to Figure 20 The UE 2000 may include a transceiver 2010, a controller 2020, and a memory 2030. According to the effective channel and signal transmission and reception method in the 5G communication system corresponding to the above embodiments, the transceiver 2010, controller 2020, and memory 2030 of the UE 2000 can operate. However, the components of the UE 2000 according to the embodiments are not limited to the examples described above. According to another embodiment, the UE 2000 may include more or fewer components than those described above. Furthermore, in certain cases, the transceiver 2010, controller 2020, and memory 2030 may be implemented in the form of a chip.

[0812] According to another embodiment, transceiver 2010 may consist of a transmitter and a receiver. Transceiver 2010 can transmit signals to and receive signals from a base station. The signals may include control information and data. For this purpose, transceiver 2010 may include an RF transmitter for up-converting and amplifying the frequency of the signal to be transmitted, and an RF receiver for amplifying the received signal with low noise and down-converting its frequency. Furthermore, transceiver 2010 can receive signals via a wireless channel and output the signals to controller 2020, and transmit signals output from controller 2020 via the same wireless channel.

[0813] The controller 2020 can control a series of processes in which the UE 2000 can operate according to the above embodiments of the present disclosure. For example, the controller 2020 can perform at least one of a method for transmitting an uplink channel / signal or a method for receiving a downlink channel / signal according to embodiments of the present disclosure. The memory 2030 can store control information or data, such as uplink-downlink configuration information, and guard band configuration information included in signals acquired from the UE 2000, as well as data required for control by the controller 2020, and has areas for storing data required for control by the controller 2020 and data generated during control by the controller 2020.

[0814] Figure 21 This is a block diagram illustrating the construction of a base station according to an embodiment of the present disclosure.

[0815] refer to Figure 21 The base station 2100 may include a transceiver 2110, a controller 2120, and a memory 2130. The transceiver 2110, controller 2120, and memory 2130 of the base station 2100 can operate according to the effective channel and signal transmission and reception method in the 5G communication system corresponding to the above embodiments. However, the components of the base station 2100 according to the embodiments are not limited to the examples described above. According to another embodiment, the base station 2100 may include more or fewer components than those described above. Furthermore, in certain cases, the transceiver 2110, controller 2120, and memory 2130 may be implemented as a single chip. According to another embodiment, the transceiver 2110 may consist of a transmitter and a receiver. The transceiver 2110 can transmit signals to and receive signals from the UE. The signals may include control information and data. For this purpose, the transceiver 2110 may include an RF transmitter for up-converting and amplifying the frequency of the signal to be transmitted, and an RF receiver for low-noise amplification of the received signal and down-converting its frequency. In addition, transceiver 2110 can receive signals via a wireless channel and output the signals to controller 2120, and transmit signals output from controller 2120 via a wireless channel.

[0816] The controller 2120 can control a series of processes that enable the base station 2100 to operate according to the embodiments of the present disclosure described above. For example, the controller 2120 can execute at least one of a method for the base station to receive an uplink channel / signal or a method for the base station to transmit a downlink channel / signal.

[0817] The memory 2130 can store control information, such as uplink-downlink configuration information and guard band configuration information, as well as data or control information received from the UE determined by the base station 2100, and has areas for storing data required for control by the controller 2120 and data generated during control by the controller 2120.

[0818] The embodiments disclosed in this specification and accompanying drawings are merely specific examples to facilitate the description of the technical content of this disclosure and to aid in understanding it, and are not intended to limit the scope of this disclosure. That is, it will be apparent to those skilled in the art that other modifications based on the technical spirit of this disclosure can be implemented. Furthermore, each of the above embodiments can be combined with each other as needed.

Claims

1. A method for operating a terminal of a communication system, the method comprising: Send capability information to the base station, the capability information indicating the detection reference signal (SRS) antenna port switching modes supported by the terminal; The terminal receives SRS resource configuration information determined based on the SRS antenna port switching mode supported by the terminal from the base station. The SRS resource configuration information includes one or more SRS resource sets. as well as Based on the SRS resource configuration information, an SRS is sent to the base station. Specifically, when the SRS antenna port switching mode corresponds to 2T6R, the SRS resource configuration information includes a maximum of three SRS resource sets, and a total of three SRS resources being transmitted. Specifically, when the SRS antenna port switching mode corresponds to 2T8R, the SRS resource configuration information includes up to four SRS resource sets, and a total of four SRS resources are transmitted.

2. The method according to claim 1, wherein, When the SRS antenna port switching mode corresponds to 1T6R, the SRS resource configuration information includes up to three SRS resource sets, and In the case of three SRS resource sets, a total of six SRS resources are transmitted, and each SRS resource in the three SRS resource sets is associated with a different antenna port.

3. The method according to claim 1, wherein, When the SRS antenna port switching mode corresponds to 1T8R, the SRS resource configuration information includes up to four SRS resource sets, and In the case of four SRS resource sets, a total of eight SRS resources are transmitted, and each SRS resource in the four SRS resource sets is associated with a different antenna port.

4. The method according to claim 1, wherein, When the SRS antenna port switching mode corresponds to 2T6R, the SRS resource configuration information includes three SRS resource sets, the total of three SRS resources are transmitted, and each SRS resource in the three SRS resource sets is associated with a different antenna port pair.

5. The method according to claim 1, wherein, When the SRS antenna port switching mode corresponds to 2T8R, the SRS resource configuration information includes four SRS resource sets, the total of four SRS resources are transmitted, and each SRS resource in the four SRS resource sets is associated with a different antenna port pair.

6. The method according to claim 1, wherein, When the SRS antenna port switching mode corresponds to 4T8R, the SRS resource configuration information includes a maximum of two SRS resource sets, and In the case of two SRS resource sets, a total of two SRS resources are transmitted, and each SRS resource in the two SRS resource sets is associated with a different antenna port.

7. A method for operating a base station of a communication system, the method comprising: Receive capability information from the terminal, the capability information indicating the detection reference signal (SRS) antenna port switching modes supported by the terminal; Send SRS resource configuration information to the terminal based on the SRS antenna port switching mode supported by the terminal, wherein the SRS resource configuration information includes one or more SRS resource sets; as well as Based on the SRS resource configuration information, SRS is received from the terminal. Wherein, when the SRS antenna port switching mode corresponds to 2T6R, the SRS resource configuration information includes a maximum of three SRS resource sets, and a total of three SRS resources being received, and Specifically, when the SRS antenna port switching mode corresponds to 2T8R, the SRS resource configuration information includes a maximum of four SRS resource sets, and a total of four SRS resources are received.

8. The method according to claim 7, wherein, When the SRS antenna port switching mode corresponds to 1T6R, the SRS resource configuration information includes up to three resource sets, and In the case of three SRS resource sets, a total of six SRS resources are received, and each SRS resource in the three SRS resource sets is associated with a different antenna port.

9. The method according to claim 7, wherein, When the SRS antenna port switching mode corresponds to 1T8R, the SRS resource configuration information includes up to four SRS resource sets, and In the case of four SRS resource sets, a total of eight SRS resources are received, and each SRS resource in the four SRS resource sets is associated with a different antenna port.

10. The method according to claim 7, wherein, When the SRS antenna port switching mode corresponds to 2T6R, the SRS resource configuration information includes three SRS resource sets, the total of three SRS resources are received, and each SRS resource in the three SRS resource sets is associated with a different antenna port pair.

11. The method according to claim 7, wherein, When the SRS antenna port switching mode corresponds to 2T8R, the SRS resource configuration information includes four SRS resource sets, the total of four SRS resources are received, and each SRS resource in the four SRS resource sets is associated with a different antenna port pair.

12. The method according to claim 7, wherein, When the SRS antenna port switching mode corresponds to 4T8R, the SRS resource configuration information includes a maximum of two SRS resource sets, and In the case of two SRS resource sets, a total of two SRS resources are received, and each SRS resource in the two SRS resource sets is associated with a different antenna port.

13. A terminal of a communication system, the terminal comprising: transceiver; as well as The controller is configured to: The terminal sends capability information to the base station, the capability information indicating the detection reference signal (SRS) antenna port switching modes supported by the terminal. The terminal receives SRS resource configuration information from the base station, determined according to the SRS antenna port switching mode supported by the terminal. The SRS resource configuration information includes one or more SRS resource sets. Based on the SRS resource configuration information, an SRS is sent to the base station. Specifically, when the SRS antenna port switching mode corresponds to 2T6R, the SRS resource configuration information includes a maximum of three SRS resource sets, and a total of three SRS resources being transmitted. Specifically, when the SRS antenna port switching mode corresponds to 2T8R, the SRS resource configuration information includes up to four SRS resource sets, and a total of four SRS resources are transmitted.

14. A base station for a communication system, the base station comprising: transceiver; as well as The controller is configured to: The terminal receives capability information indicating the detection reference signal (SRS) antenna port switching modes supported by the terminal. According to the SRS antenna port switching mode supported by the terminal, SRS resource configuration information is sent to the terminal. The SRS resource configuration information includes one or more SRS resource sets, and... SRS is received from the terminal based on the SRS resource configuration information. Wherein, when the SRS antenna port switching mode corresponds to 2T6R, the SRS resource configuration information includes a maximum of three SRS resource sets, and a total of three SRS resources being received, and Specifically, when the SRS antenna port switching mode corresponds to 2T8R, the SRS resource configuration information includes a maximum of four SRS resource sets, and a total of four SRS resources are received.

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