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

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal of a communication system according to one embodiment of the present disclosure comprises the steps of: receiving, from a base station, configuration information including a number (Ns) of Orthogonal Frequency Division Multiplexing (OFDM) symbols associated with a Sounding Reference Signal (SRS) resource and a number (N) of antenna ports associated with the SRS resource; identifying an antenna port mapped to each of the OFDM symbols associated with the SRS resource; and transmitting the SRS to the base station in the OFDM symbol associated with the SRS resource based on the antenna port mapped to each of the OFDM symbols, where N may be 8 or more.

Description

Technical Field

[0001] The present disclosure relates to operations of a terminal and a base station in a wireless communication system. In particular, the present disclosure relates to a method for transmitting and receiving an uplink reference signal in a wireless communication system and a device capable of performing the method. Background Art

[0002] 5G mobile communication technology defines a wide frequency band, making high transmission rates and new services possible, and can be implemented not only in "sub-6 GHz" frequency bands such as 3.5 GHz, but also in "higher than 6 GHz" frequency bands called millimeter waves (mmWave) including 28 GHz and 39 GHz. In addition, it has been considered to implement 6G mobile communication technology (called super 5G system) in terahertz frequency bands (e.g., 95 GHz to 3 THz frequency bands) in order to achieve a transmission rate fifty times faster than 5G mobile communication technology and an ultra-low latency of one tenth of 5G mobile communication technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra-reliable low latency communication (URLLC), and massive machine type communication (mMTC), standardization has been underway on various technologies: beamforming and massive MIMO for alleviating radio wave path loss and increasing radio wave transmission distance in millimeter waves, support for dynamic operation of parameter sets (e.g., operating multiple subcarrier intervals) and time slot formats for efficient utilization of millimeter wave resources, initial access technology for supporting multi-beam transmission and broadband, definition and operation of BWP (bandwidth part), new channel coding methods (such as LDPC (low-density parity check) codes for large-scale data transmission and polar codes for highly reliable transmission of control information), L2 preprocessing, and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, in view of the services that 5G mobile communication technology is to support, discussions are ongoing on improvements and performance enhancements of initial 5G mobile communication technology, and there is already physical layer standardization on various technologies such as: V2X (Vehicle to Everything) for assisting driving determination of autonomous vehicles based on information about the location and status of the vehicle sent by the vehicle and for enhancing user convenience, NR-U (New Radio Unlicensed) for system operation intended to comply with various regulatory requirements in unlicensed bands, NR user equipment (UE) power saving, a non-terrestrial network (NTN) as UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable, and positioning.

[0005] In addition, in terms of air interface architecture / protocol, standardization is being conducted on various technologies such as the Industrial Internet of Things (IIoT) for supporting new services through interworking and integration with other industries, IAB (Integrated Access and Backhaul) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner, mobility enhancement including conditional switching and DAPS (Dual Active Protocol Stack) switching, and two-step random access (NR's 2-step RACH) for simplifying the random access procedure. In terms of system architecture / services, standardization is also being conducted on various technologies such as the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined network (SDN) technologies, and mobile edge computing (MEC) for receiving services based on UE location.

[0006] As 5G mobile communication systems are commercialized, the number of connected devices, which has been growing exponentially, will be connected to the communication network, and it is therefore expected that enhanced functions and performance of the 5G mobile communication systems and integrated operations of the connected devices will be necessary. To this end, new research related to the following technologies is planned: extended reality (XR) for effectively supporting AR (augmented reality), VR (virtual reality), MR (mixed reality), etc., 5G performance improvement and complexity reduction by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a basis not only for developing new waveforms for providing coverage in the terahertz band for 6G mobile communication technology, multi-antenna transmission technologies (such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas), metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional spatial multiplexing technologies using OAM (orbital angular momentum), and RIS (reconfigurable smart surfaces), but also for developing full-duplex technologies for improving the frequency efficiency of 6G mobile communication technology and improving system networks, AI-based communication technologies for achieving system optimization by utilizing satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technologies for achieving services with a complexity level that exceeds the limits of UE operating capabilities by utilizing ultra-high performance communication and computing resources. Summary of the invention

[0008] Technical issues

[0009] The disclosed embodiments are intended to provide an apparatus and method capable of effectively providing services in a mobile communication system.

[0010] Solution to the problem

[0011] According to an embodiment of the present invention for achieving the above-mentioned technical problem, a method performed by a terminal of a communication system comprises the following steps: receiving from a base station a number (N) of orthogonal frequency division multiplexing (OFDM) symbols associated with a sounding reference signal (SRS) resource; s ) and configuration information of the number of antenna ports (N) associated with the SRS resource; identifying the antenna port mapped to each of the OFDM symbols associated with the SRS resource; and based on the antenna port mapped to each of the OFDM symbols, sending the SRS to the base station in the OFDM symbol associated with the SRS resource, where N can be 8 or greater.

[0012] In addition, according to an embodiment of the present invention, a method performed by a base station of a communication system includes the following steps: sending a number (N) of orthogonal frequency division multiplexing (OFDM) symbols associated with a sounding reference signal (SRS) resource to a terminal. s ) and configuration information of the number of antenna ports (N) associated with the SRS resource; identifying the antenna port mapped to each of the OFDM symbols associated with the SRS resource; and receiving the SRS from the terminal in the OFDM symbol associated with the SRS resource based on the antenna port mapped to each of the OFDM symbols, where N can be 8 or greater.

[0013] In addition, a terminal of a communication system according to an embodiment of the present invention includes: a transceiver; and a control unit configured to receive from a base station a number (N) of orthogonal frequency division multiplexing (OFDM) symbols associated with a sounding reference signal (SRS) resource. s ) and configuration information of the number of antenna ports (N) associated with the SRS resource, identifying the antenna port mapped to each of the OFDM symbols associated with the SRS resource, and sending the SRS to the base station in the OFDM symbol associated with the SRS resource based on the antenna port mapped to each of the OFDM symbols, where N can be 8 or greater.

[0014] In addition, a base station of a communication system according to an embodiment of the present invention includes: a transceiver; and a control unit configured to send a signal including the number (N) of orthogonal frequency division multiplexing (OFDM) symbols associated with a sounding reference signal (SRS) resource to a terminal. s ) and configuration information of the number of antenna ports (N) associated with the SRS resource, identifying the antenna port mapped to each of the OFDM symbols associated with the SRS resource, and receiving the SRS from the terminal in the OFDM symbol associated with the SRS resource based on the antenna port mapped to each of the OFDM symbols, where N can be 8 or greater.

[0015] Advantageous Effects of the Invention

[0016] The disclosed embodiments provide an apparatus and method capable of effectively providing services in a mobile communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 2 is a diagram showing a basic structure of a time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.

[0018] Figure 2 is a diagram showing a frame, a subframe, and a time slot structure in a wireless communication system according to an embodiment of the present disclosure.

[0019] Figure 3 is a diagram showing an example of bandwidth section configuration in a wireless communication system according to an embodiment of the present disclosure.

[0020] Figure 4 is a diagram showing an example of configuring a control resource set of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0021] Figure 5a is a diagram showing a structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.

[0022] Figure 5b 2 is a diagram illustrating a case in which a terminal may have a plurality of PDCCH monitoring positions within a time slot through a span in a wireless communication system according to an embodiment of the present disclosure.

[0023] Figure 6 is a diagram showing an example of a DRX operation in a wireless communication system according to one embodiment of the present disclosure.

[0024] Figure 7 is a diagram showing an example of base station beam allocation configured according to TCI status in a wireless communication system according to an embodiment of the present disclosure.

[0025] Figure 8 is a diagram showing an example of a TCI state allocation method for a PDCCH in a wireless communication system according to one embodiment of the present disclosure.

[0026] Fig. 9 is a diagram showing a TCI indication MAC CE signaling structure for PDCCH DMRS in a wireless communication system according to one embodiment of the present disclosure.

[0027] Fig.10 is a diagram showing an example of beam configuration of a control resource set and a search space in a wireless communication system according to one embodiment of the present disclosure.

[0028] Fig.11 is a diagram explaining a method in which a base station and a terminal transmit and receive data in consideration of a downlink data channel and a rate matching resource in a wireless communication system according to one embodiment of the present disclosure.

[0029] Fig.12 1 is a diagram for explaining a method for selecting a control resource set that can be received by a terminal in consideration of a priority when receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.

[0030] Fig.13 is a diagram showing an example of frequency domain resource allocation of a PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0031] Fig.14 is a diagram showing an example of time domain resource allocation of a PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0032] Fig.15 is a diagram showing an example of time domain resource allocation according to subcarrier spacing of a data channel and a control channel in a wireless communication system according to one embodiment of the present disclosure.

[0033] Fig.16 The process of beam configuration and activation for PDSCH is shown.

[0034] Fig.17 is a diagram showing an example of PUSCH repetition transmission type B in a wireless communication system according to one embodiment of the present disclosure.

[0035] Fig.18 2 is a diagram showing a wireless protocol structure of a base station and a terminal in a wireless communication system in a single cell, carrier aggregation, and dual connectivity case according to an embodiment of the present disclosure.

[0036] Fig.19 is a diagram showing a structure in which an SRS is allocated for each subband.

[0037] Fig. 20 is a diagram illustrating an operation of a terminal for SRS transmission according to one embodiment of the present disclosure.

[0038] Fig.21 is a diagram illustrating an operation of a base station for SRS reception according to one embodiment of the present disclosure.

[0039] Fig. 22 is a diagram showing a structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0040] Fig.23is a diagram showing a structure of a base station in a wireless communication system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

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

[0042] When describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure are omitted. This is to convey the main idea of ​​the present disclosure more clearly without making it obscure by omitting unnecessary descriptions.

[0043] For the same reason, some components in the drawings are enlarged, omitted or schematically shown. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are marked for the same or corresponding components in each drawing.

[0044] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for realizing them will become clear. However, the present disclosure is not limited to the embodiments disclosed below, but can be implemented in various different forms, and these embodiments are provided only to ensure that the disclosure of the present disclosure is complete and the scope of the present disclosure is fully informed to the ordinary technicians in the technical field to which the present disclosure belongs, and the present disclosure is limited only by the scope of the claims. Throughout the specification, the same figure numerals represent the same components. In addition, when describing the present disclosure, if it is determined that the detailed description of the relevant functions or configurations may unnecessarily obscure the subject matter of the present disclosure, the detailed description will be omitted. In addition, the terms described below are defined in view of the functions in the present disclosure, and may vary depending on the intention or habit of the user or operator. Therefore, it should be defined on the basis of the content of the entire specification.

[0045] In the following, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a downlink (DL) refers to a wireless transmission path of a signal sent by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal sent by a terminal to a base station. In addition, although an LTE or LTE-A system may be described as an example below, embodiments of the present disclosure may be applied to other communication systems having similar technical backgrounds or channel types. For example, the fifth generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the following 5G may be a concept including existing LTE, LTE-A, and other similar services. In addition, as judged by a person with skilled technical knowledge, the present disclosure may be applied to other communication systems by some modifications without significantly departing from the scope of the present disclosure.

[0046] In this case, it should be understood that each block of the process flow chart diagram and the combination of the flow chart diagram can be performed by computer program instructions. These computer program instructions can be installed on a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the instructions are created when executed by the processor of the computer or other programmable data processing device to perform the components of the functions described in the flow chart blocks. These computer program instructions can be stored in a computer-usable or computer-readable memory, which can point to a computer or other programmable data processing device to implement the functions in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory can produce a manufacturing project including an instruction component for performing the functions described in the flow chart blocks. The computer program instructions can also be installed on a computer or other programmable data processing device, and a series of operating steps are performed on the computer or other programmable data processing device to create a computer executable process, so that the instructions of the execution computer or other programmable data processing device can also provide steps for performing the functions described in the flow chart blocks.

[0047] In addition, each block can represent a module, a fragment or a portion of a code including one or more executable instructions for performing a specified logical function. It should also be noted that in some alternative embodiments, the functions recorded in the block may not occur in order. For example, two blocks shown one by one can actually be performed substantially simultaneously, or these blocks can be performed in reverse order according to the functions they sometimes perform.

[0048] In this case, the term "~ unit" used in the present embodiment refers to a software or hardware component that can play any role, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "~ unit" is not software or hardware specific. It can be configured to reside on an addressable storage medium, or it can be configured to execute one or more processors. Therefore, in one example, "~ 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, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided in components and "~ units" can be combined into fewer components and "~ units", or further divided into additional components and "~ units". In addition, components and "~ units" can be implemented as one or more CPUs in a playback device or a secure multimedia card. In addition, in an embodiment, "~ unit" can include one or more processors.

[0049] Wireless communication systems have evolved from initially providing voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services using, for example, 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), LTE-Pro, 3GPP2's High Speed ​​Packet Data (HRPD), Ultra Mobile Broadband (UMB), and IEEE's 802.16e.

[0050] As a representative example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) method for the downlink (DL) and a single carrier frequency division multiple access (SC-FDMA) method for the uplink (UL). The uplink refers to a wireless link in which a terminal (user equipment (UE) or mobile station (MS)) sends data or control signals to a base station (eNode B, or base station (BS)), and the downlink refers to a wireless link in which a base station sends data or control signals to a terminal. In the above-mentioned multiple access method, the data or control information of each user can be distinguished by allocating and operating time-frequency resources for carrying data or control information for each user so that they do not overlap, that is, orthogonality is established.

[0051] As a future communication system after LTE, the 5G communication system should be able to freely reflect the various requirements of users and service providers, and therefore should support services that meet various requirements at the same time. Services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliability low latency communication (URLLC).

[0052] eMBB is designed to provide higher data rates than those supported by traditional LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, from the perspective of a base station, eMBB should be able to provide a peak data rate of 20Gbps in the downlink and a peak data rate of 10Gbps in the uplink. In addition, the 5G communication system must provide an increased user-perceived data rate while providing the peak data rate. In order to meet these requirements, various transmission and reception technologies will need to be improved, including more advanced multi-antenna (Multi Input Multi Output, MIMO) transmission technology. In addition, while LTE uses a transmission bandwidth of up to 20MHz in the 2GHz band to transmit signals, the 5G communication system will use a frequency bandwidth wider than 20MHz in the 3-6GHz or 6GHz or higher bands to meet the data transmission rates required by the 5G communication system.

[0053] At the same time, mMTC is considered to support application services such as the Internet of Things (IoT) in 5G communication systems. In order to efficiently deliver the Internet of Things, mMTC needs to support the access of a large number of terminals within a cell, improve the coverage of the terminal, improve the battery life, and reduce the cost of the terminal. Since the Internet of Things will be attached to multiple sensors and various devices to provide communication capabilities, it must be able to support a large number of terminals within a cell (for example, 1,000,000 terminals / km 2 ). In addition, due to the nature of the service, terminals supporting mMTC are likely to be located in shadowed areas not covered by cells (such as basements of buildings), and may require greater coverage than other services provided by 5G communication systems. Devices supporting mMTC will need to be low-cost devices and may require very long battery life, such as 10 to 15 years, because it is difficult to frequently replace the battery of the device.

[0054] Finally, URLLC is a cellular-based wireless communication service for specific mission-critical purposes. Examples include services for remote control of robots or machinery, industrial automation, drones, remote healthcare, emergency alerts, etc. Therefore, the communication provided by URLLC must be extremely low latency and highly reliable. For example, URLLC-enabled services must meet air interface latency of less than 0.5 milliseconds while having 10 -5 Or smaller packet error rate requirements. Therefore, for services supporting URLLC, the 5G system may need to provide a smaller transmission time interval (TTI) than other services, and at the same time, the design may require large resource allocation in the frequency band to ensure the reliability of the communication link.

[0055] The three services of 5G, namely eMBB, URLLC and mMTC, can be multiplexed and transmitted in one system. In this case, different transmission and reception technologies and transmission and reception parameters can be used between services to meet the different requirements of each service. Of course, 5G is not limited to the above three services.

[0056] [NR time-frequency resources]

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

[0058] Figure 1 is a diagram showing a basic structure of a time-frequency domain in a 5G wireless communication system, which is a radio resource domain in which data or a control channel is transmitted.

[0059] refer to Figure 1 , the horizontal domain represents the time domain, and the vertical domain represents the frequency domain. The basic unit of resources in the time domain and the frequency domain is a resource element (RE) 101, which is defined as 1 orthogonal frequency division multiplexing (OFDM) symbol 102 in the time domain and 1 subcarrier 103 in the frequency domain. In the frequency domain, (eg, 12) consecutive REs may constitute one resource block (RB) 104 .

[0060] Figure 2 is a diagram showing a frame, a subframe, and a time slot structure in a wireless communication system according to an embodiment of the present disclosure.

[0061] refer to Figure 2 , shows an example of the structure of a frame 200, a subframe 201, and a time slot 202. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus one frame 200 may be composed of a total of 10 subframes 201. One time slot 202 and 203 may be defined by 14 OFDM symbols (i.e., the number of symbols per time slot is 14 OFDM symbols). One subframe 201 may be composed of one or more time slots 202 and 203, and the number of time slots 202 and 203 per one subframe 201 may vary depending on the configured values ​​μ 204 and 205 of the subcarrier spacing. Figure 2 In the example of FIG. 2 , a case where μ=0 204 and a case where μ=1 205 are shown as subcarrier spacing configuration values. When μ=0 204, 1 subframe 201 may consist of one time slot 202, and when μ=1 205, 1 subframe 201 may consist of two time slots 203. That is, the number of time slots per subframe is can vary depending on the configured value μ of the subcarrier spacing and the number of time slots per frame Can be changed accordingly. According to each subcarrier spacing configuration μ and It can be defined as in the following [Table 1].

[0062] [Table 1]

[0063]

[0064] [Bandwidth Part (BWP)]

[0065] Next, a bandwidth part (BWP) configuration in a 5G communication system will be described in detail with reference to the accompanying drawings.

[0066] Figure 3 is a diagram showing an example of bandwidth section configuration in a wireless communication system according to an embodiment of the present disclosure.

[0067] refer to Figure 3 , shows an example in which the UE bandwidth 300 is configured as two bandwidth parts (ie, bandwidth part #1 (BWP#1) 301 and bandwidth part #2 (BWP#2) 302). The base station may configure one or more bandwidth parts to the terminal, and may configure the following information for each bandwidth part.

[0068] [Table 2]

[0069]

[0070] Of course, the configuration for the bandwidth part is not limited to the above examples, and in addition to the above configuration information, various parameters related to the bandwidth part can also be configured to the terminal. The configuration information can be sent to the terminal by the base station through high-level signaling (e.g., radio resource control (RRC) signaling). At least one of the configured one or more bandwidth parts can be activated. The activation state of the configured bandwidth part can be semi-statically sent from the base station to the terminal through RRC signaling, or dynamically sent through downlink control information (DCI).

[0071] According to some embodiments, the terminal may receive an initial bandwidth part (initial BWP) for an initial connection from a base station through a master information block (MIB) before a radio resource control (RRC) connection. More specifically, during the initial connection phase, the terminal may receive configuration information for a search space and a control resource set (CORESET) in which a PDCCH may be sent to receive system information required for the initial connection (which may correspond to the remaining system information (RMSI) or the system information block 1 (SIB1)) through the MIB. The control resource set and the search space configured by the MIB may be regarded as an identification (ID) 0, respectively. The base station may notify the terminal of configuration information such as frequency allocation information, time allocation information, and parameter set for control resource set #0 through the MIB. In addition, the base station may notify the terminal of a monitoring period and timing for control resource set #0, that is, configuration information for search space #0 through the MIB. The terminal may regard the frequency domain configured in the control resource set #0 obtained from the MIB as the initial bandwidth part for the initial connection. In this case, the identification (ID) of the initial bandwidth part may be regarded as 0.

[0072] The configuration of bandwidth portions supported by the 5G wireless communication system can be used for various purposes.

[0073] According to some embodiments, when the bandwidth supported by the terminal is less than the system bandwidth, a configuration for a bandwidth portion may be used. For example, the base station may configure the frequency position of the bandwidth portion to the terminal (configuration information 2), thereby allowing the terminal to send and receive data at a specific frequency position within the system bandwidth.

[0074] In addition, according to some embodiments, the base station may configure multiple bandwidth parts to the terminal for the purpose of supporting different parameter sets. For example, in order to support both data transmission and reception using a subcarrier spacing of 15kHz and a subcarrier spacing of 30kHz for the terminal, the base station may configure two bandwidth parts with subcarrier spacings of 15kHz and 30kHz, respectively. Different bandwidth parts may be frequency-division multiplexed, and when the base station wants to send and receive data at a specific subcarrier spacing, the bandwidth part configured with the corresponding subcarrier spacing may be activated.

[0075] In addition, according to one embodiment, for the purpose of reducing the power consumption of the terminal, the base station can configure bandwidth parts with different sizes of bandwidth to the terminal. For example, if the terminal supports a very large bandwidth, for example, 100MHz, and always sends and receives data through this bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels with a large bandwidth of 100MHz in the absence of traffic may be very inefficient in terms of power consumption. For the purpose of reducing the power consumption of the terminal, the base station can configure a relatively small bandwidth part, such as a bandwidth part of 20MHz, to the terminal. In the absence of traffic, the terminal can perform monitoring operations in the 20MHz bandwidth part, and when data is generated, it can send and receive data in the 100MHz bandwidth part according to the instructions of the base station.

[0076] In the method for configuring the bandwidth part, the terminal can receive configuration information about the initial bandwidth part through the master information block (MIB) in the initial connection stage before the RRC connection. More specifically, the terminal can be configured with a control resource set (CORESET) for a downlink control channel according to the MIB of the physical broadcast channel (PBCH), through which the downlink control information (DCI) of the scheduling system information block (SIB) can be sent. The bandwidth of the control resource set configured as the MIB can be regarded as the initial bandwidth part, and through the configured initial bandwidth part, the terminal can receive the physical downlink shared channel (PDSCH) on which the SIB is sent. In addition to receiving the SIB, the initial bandwidth part can also be used for other system information (OSI), paging and random access.

[0077] [Bandwidth Part (BWP) Change]

[0078] If one or more bandwidth parts are configured, the base station may use the bandwidth part indicator field in the DCI to instruct the terminal to change (or switch, transform) the bandwidth part. Figure 3 In the present invention, if the currently activated bandwidth part of the terminal is bandwidth part #1 301, the base station can instruct the terminal to use the bandwidth part indicator in the DCI to indicate bandwidth part #2 302, and the terminal can perform bandwidth part switching to bandwidth part #2 302, as indicated by the bandwidth part indicator in the received DCI.

[0079] As described above, since the DCI-based bandwidth part switching can be guided by the DCI scheduling PDSCH or PUSCH, when receiving a bandwidth part switching request, the terminal should be able to receive or send the PDSCH or PUSCH scheduled by the DCI in the switched bandwidth part without any difficulty. To this end, the standard specifies the required time delay (T BWP) requirements, which can be defined, for example, as follows.

[0080] [Table 3]

[0081]

[0082] Depending on the UE capability, the requirement for bandwidth part switching delay time may support type 1 or type 2. The terminal may report the supportable bandwidth part delay time type to the base station.

[0083] According to the above requirement for bandwidth part switching time delay, when the terminal receives the DCI including the bandwidth part change indicator in time slot n, the terminal can switch the bandwidth part to the same bandwidth part at no later than time slot n+T BWP The base station can complete the change to the new bandwidth part indicated by the bandwidth part change indicator in the time of , and can perform the transmission and reception of the data channel scheduled by the DCI in the new bandwidth part. When the base station wants to schedule the data channel using the new bandwidth part, the base station can consider the bandwidth part change delay time (T BWP ) to determine the time domain resource allocation for the data channel. That is, when the base station schedules the data channel using the new bandwidth part, the base station may schedule the data channel after the bandwidth part change delay time when determining the time domain resource allocation for the data channel. Therefore, the terminal may not expect the DCI indicating the bandwidth part change to be less than the bandwidth part change delay time (T BWP )’s time slot offset (K0 or K2) value.

[0084] If the terminal has received a DCI indicating a partial change in bandwidth (e.g., DCI format 1_1 or 0_1), the terminal may not perform any transmission or reception during a time interval from the third symbol of the time slot in which the PDCCH including the DCI is received to the start of the time slot indicated by the time slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field within the DCI. For example, if the terminal receives 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 terminal may not perform any transmission or reception from the third symbol of time slot n until the symbol before time slot n+K (i.e., the last symbol of time slot n+K-1).

[0085] [SS / PBCH block]

[0086] Next, a synchronization signal (SS) / PBCH block in a 5G wireless communication system is described.

[0087] The SS / PBCH block may refer to a physical layer channel block composed of a primary SS (PSS), a secondary SS (SSS) and a PBCH. Specifically, it may be described as follows.

[0088] -PSS: It is a signal used as a standard for downlink time / frequency synchronization and provides some information about the cell ID.

[0089] - SSS: It is a standard for downlink time / frequency synchronization and provides the remaining cell ID information that the PSS does not provide. In addition, it can be used as a reference signal for demodulation of PBCH.

[0090] -PBCH: It provides necessary system information required for transmitting and receiving data channels and control channels of terminals. Necessary system information may include search space related control information indicating radio resource mapping information of control channels, scheduling control information of separate data channels for transmitting system information, etc.

[0091] -SS / PBCH block: SS / PBCH block consists of a combination of PSS, SSS and PBCH. One or more SS / PBCH blocks can be sent within 5ms, and each sent SS / PBCH block can be distinguished by an index.

[0092] The terminal can detect PSS and SSS and decode PBCH in the initial access phase. MIB can be obtained from PBCH, and control resource set (CORESET) #0 (which can correspond to a control resource set with a control resource set index of 0) can be configured according to MIB. Assuming that the selected SS / PBCH block and the demodulation reference signal (DMRS) sent in control resource set #0 are quasi-co-located (QCL), the terminal can perform monitoring on control resource set #0. The terminal can receive system information through the downlink control information sent from control resource set #0. The terminal can obtain random access channel (RACH) related configuration information required for initial access from the received system information. The terminal can send a physical RACH (PRACH) to the base station considering the selected SS / PBCH index, and the base station receiving the PRACH can obtain information about the SS / PBCH block index selected by the terminal. The base station can know which block the terminal has selected from each SS / PBCH block and monitor the control resource set #0 associated with it.

[0093] [Discontinuous Reception (DRX)]

[0094] Figure 6 It is a diagram for explaining discontinuous reception (DRX).

[0095] Discontinuous reception (DRX) is an operation in which a terminal using a service receives data discontinuously in an RRC connection state in which a radio link is established between a base station and a terminal. When DRX is applied, the terminal turns on the receiver at a specific time point to monitor the control channel, and if no data is received within a certain period of time, the receiver is turned off to reduce the power consumption of the terminal. The DRX operation can be controlled by the MAC layer device based on various parameters and timers.

[0096] refer to Figure 6 , the active time 605 is the time when the terminal wakes up and monitors the PDCCH in each DRX cycle. The active time 605 can be defined as follows.

[0097] - drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running; or

[0098] - a scheduling request is sent on the PUCCH and is pending; or

[0099] - after successfully receiving a random access response to a random access preamble that was not selected by the MAC entity in a contention-based random access preamble, a PDCCH indicating a new transmission addressed to the C-RNTI of the MAC entity has not been received

[0100] drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer, etc. are timers whose values ​​are configured by the base station, and they have a function of configuring the terminal to monitor the PDCCH when certain conditions are met.

[0101] drx-onDurationTimer 615 is a parameter used to configure the minimum time that the terminal stays awake in the DRX cycle. drx-InactivityTimer 620 is a parameter used to configure the additional time that the terminal stays awake when receiving 630 a PDCCH indicating a new uplink transmission or downlink transmission. drx-RetransmissionTimerDL is a parameter used to configure the maximum time that the terminal stays awake in the downlink HARQ process to receive a downlink retransmission. drx-RetransmissionTimerUL is a parameter used to configure the maximum time that the terminal stays awake in the uplink HARQ process to receive an uplink retransmission grant. drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL and drx-RetransmissionTimerUL can be configured as, for example, a time, a number of subframes, a number of time slots, etc. ra-ContentionResolutionTimer is a parameter used to monitor the PDCCH in the random access process.

[0102] The inactive time 610 is a time configured not to monitor the PDCCH during the DRX operation and / or a time configured not to receive the PDCCH. The remaining time excluding the active time 605 from the entire time of performing the DRX operation may be the inactive time 610. If the terminal does not monitor the PDCCH during the active time 605, it may enter a sleep or inactive state to reduce power consumption.

[0103] The DRX cycle refers to the period during which the terminal wakes up and monitors the PDCCH. In other words, it refers to the period during which the time interval or on-duration occurs after the terminal monitors the PDCCH and until the terminal monitors the next PDCCH. There are two types of DRX cycles: short DRX cycle and long DRX cycle. The short DRX cycle can be optionally applied.

[0104] The long DRX cycle 625 is the longer cycle of the two DRX cycles configured in the terminal. When operating in long DRX, the terminal starts the drx-onDurationTimer 615 again at a time point that has passed the long DRX cycle 625 from the starting point (e.g., the starting symbol) of the drx-onDurationTimer 615. When operating in the long DRX cycle 625, the terminal may start the drx-onDurationTimer 615 in a time slot after the drx-SlotOffset in the subframe satisfying the following mathematical formula 1. Here, drx-SlotOffset means a delay before starting the drx-onDurationTimer 615. The drx-SlotOffset may be configured as, for example, a time, the number of time slots, etc.

[0105] [Equation 1]

[0106] [(SFN x 10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset

[0107] At this time, drx-LongCycleStartOffset may be used to define the long DRX cycle 625, and drx-StartOffset may be used to define a subframe for starting the long DRX cycle 625. drx-LongCycleStartOffset may be configured as, for example, time, the number of subframes, the number of slots, and the like.

[0108] [PDCCH: DCI related]

[0109] Next, we will explain the downlink control information (DCI) in the 5G system in detail.

[0110] In the 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) is sent from the base station to the terminal through DCI. The terminal can monitor the fallback DCI format and non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may consist of fixed fields defined between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0111] DCI can be sent through the physical downlink control channel (PDCCH), which is the physical downlink control channel after the channel coding and modulation process. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with a radio network temporary identifier (RNTI) corresponding to the terminal's identity. Different RNTIs can be used depending on the purpose of the DCI message (such as UE-specific data transmission, power control commands, or random access responses). That is, the RNTI is not sent explicitly, but is included in the CRC calculation process and sent. When receiving a DCI message sent on the PDCCH, the terminal uses the allocated RNTI to identify the CRC, and if the CRC identification result is correct, the terminal can know that the message is sent to the terminal.

[0112] For example, the DCI for scheduling PDSCH for system information (SI) may be scrambled with SI-RNTI. The DCI for scheduling PDSCH for random access response (RAR) message may be scrambled with RA-RNTI. The DCI for scheduling PDSCH for paging message may be scrambled with P-RNTI. The DCI for notifying slot format indicator (SFI) may be scrambled with SFI-RNTI. The DCI for notifying transmit power control (TPC) may be scrambled with TPC-RNTI. The DCI for scheduling UE-specific PDSCH or PUSCH may be scrambled with cell RNTI (C-RNTI).

[0113] DCI format 0_0 may be used as a fallback DCI for scheduling PUSCH, where the CRC may be scrambled with the C-RNTI. DCI format 0_0 with the CRC scrambled with the C-RNTI may include, for example, the following information.

[0114] [Table 4]

[0115]

[0116] DCI format 0_1 ​​may be used as a fallback DCI for scheduling PUSCH, where the CRC may be scrambled with C-RNTI. DCI format 0_1 ​​with CRC scrambled with C-RNTI may include, for example, the following information.

[0117] [Table 5]

[0118]

[0119] DCI format 1_0 may be used as a fallback DCI for scheduling PDSCH, where the CRC may be scrambled with the C-RNTI. DCI format 1_0 with the CRC scrambled with the C-RNTI may include, for example, the following information.

[0120] [Table 6]

[0121]

[0122] DCI format 1_1 may be used as a fallback DCI for scheduling PDSCH, where the CRC may be scrambled with the C-RNTI. DCI format 1_1 with the CRC scrambled with the C-RNTI may include, for example, the following information.

[0123] [Table 7]

[0124]

[0125] [PDCCH: CORESET, REG, CCE, search space]

[0126] Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the accompanying drawings.

[0127] Figure 4 is a diagram showing an example of a control resource set (CORESET) through which a downlink control channel is transmitted in a 5G wireless communication system. Figure 4 An example is shown in which a UE bandwidth portion 410 is configured in the frequency domain, and two control resource sets (control resource set #1 401, control resource set #2 402) are configured in a time slot 420 in the time domain. The control resource sets 401 and 402 may be configured as specific frequency resources 403 within the entire UE bandwidth portion 410 in the frequency domain. The control resource sets 401 and 402 may be configured as one or more OFDM symbols in the time domain, which may be defined as a control resource set duration 404. Figure 4 In the example shown, control resource set #1 401 is configured as a control resource set duration of 2 symbols, and control resource set #2 402 is configured as a control resource set duration of 1 symbol.

[0128] The control resource set in the aforementioned 5G can be configured to the terminal by the base station through high-level signaling (e.g., system information, master information block (MIB), radio resource control (RRC) signaling). Configuring the control resource set to the terminal means providing information such as the control resource set identifier, the frequency position of the control resource set, and the symbol length of the control resource set. For example, the information may include the following.

[0129] [Table 8]

[0130]

[0131] In [Table 8], the tci-StatesPDCCH (abbreviated as transmission configuration indication (TCI) state) configuration information may include information of one or more synchronization signal (SS) / physical broadcast channel (PBCH) block indices or channel state information reference signal (CSI-RS) indices that are in a quasi co-location (QCL) relationship with the DMRS transmitted by the corresponding control resource set.

[0132] Figure 5a is a diagram showing an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in 5G. Figure 5a The basic unit of time and frequency resources constituting the control channel may be a resource element group (REG) 503, wherein the REG 503 may be defined by one OFDM symbol 501 in the time domain and one physical resource block (PRB) 502 in the frequency domain, i.e., 12 subcarriers. The base station may configure the downlink control channel allocation unit by cascading the REGs 503.

[0133] like Figure 5a As shown, if the basic unit for allocating a downlink control channel in 5G is called a control channel element (CCE) 504, then one CCE 504 may be composed of a plurality of REGs 503. Figure 5a For example, the REG 503 shown in FIG. 5 may be composed of 12 REs, and if one CCE 504 is composed of six REGs 503, then one CCE 504 may be composed of 72 REs. When a downlink control resource set is configured, the corresponding region may be composed of a plurality of CCEs 504, and a specific downlink control channel may be mapped to one or more CCEs 504 for transmission based on an aggregation level (AL) within the control resource set. The CCEs 504 within the control resource set may be numbered, wherein the CCEs 504 may be numbered according to a logical mapping method.

[0134] Figure 5a The basic unit of the downlink control channel (ie, REG 503) shown in FIG. 5 may include both REs to which DCI is mapped and regions to which DMRS 505, which is a reference signal for decoding REs, is mapped. Figure 5aAs shown in , three DMRS 505 can be sent within one REG 503. Depending on the aggregation level (AL), the number of CCEs required to send the PDCCH can be 1, 2, 4, 8, or 16, and different numbers of CCEs can be used to achieve link adaptation of the downlink control channel. For example, when AL=1, one downlink control channel can be sent by L CCEs. Since the terminal must detect the signal without knowing the information about the downlink control channel, a search space representing a set of CCEs is defined for blind decoding. The search space is a set of downlink control channel candidates consisting of CCEs that the terminal must try to decode at a given aggregation level, and since there are several aggregation levels that create bundles of 1, 2, 4, 8, and 16 CCEs, the terminal can have multiple search spaces. A search space set can be defined as a set of search spaces at all configured aggregation levels.

[0135] The search space can be classified into a common search space and a UE-specific search space. The common search space of PDCCH can be searched by a certain group of terminals or all terminals to receive cell common control information, such as dynamic scheduling or paging messages for system information. For example, PDSCH scheduling allocation information for the transmission of SIBs including operator information of the cell, etc. can be received by searching the common search space of PDCCH. The common search space can be defined as a set of predefined CCEs because a certain group of terminals or all terminals should receive PDCCH. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by searching the UE-specific search space of PDCCH. The UE-specific search space can be defined specifically for the UE based on the terminal's identity and various system parameters.

[0136] In 5G, the parameters of the search space for PDCCH can be configured from the base station to the terminal through high-level signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates under each aggregation level L, the monitoring period of the search space, the monitoring time of each symbol in the time slot of the search space, the type of search space (common search space or UE-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the control resource set index for monitoring the search space. For example, the parameters of the search space for PDCCH may include the following information.

[0137] [Table 9]

[0138]

[0139]

[0140] Based on the configuration information, the base station may configure one or more search space sets for the terminal. According to some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, and may configure monitoring of DCI format A scrambled with X-RNTI in search space set 1 in the common search space, and may configure monitoring of DCI format B scrambled with Y-RNTI in search space set 2 in the UE-specific search space.

[0141] According to the configuration information, one or more search space sets may exist in a common search space or a UE-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, and search space set #3 and search space set #4 may be configured as UE-specific search spaces.

[0142] In the common search space, the following combinations of DCI formats and RNTIs may be monitored. Of course, this is not limited to the following examples.

[0143] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0144] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0145] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0146] -DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0147] -DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0148] In the UE-specific search space, the following combinations of DCI formats and RNTIs may be monitored. Of course, this is not limited to the following examples.

[0149] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0150] - The RNTI specified by DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI may have the following definition and usage.

[0151] Cell RNTI (C-RNTI): used for UE-specific PDSCH scheduling

[0152] Temporary cell RNTI (TC-RNTI): used for UE-specific PDSCH scheduling

[0153] Configured Scheduling RNTI (CS-RNTI): used for semi-statically configured UE-specific PDSCH scheduling

[0154] Random access RNTI (RA-RNTI): used for PDSCH scheduling in the random access phase

[0155] Paging RNTI (P-RNTI): used for PDSCH scheduling in which paging is sent

[0156] System Information RNTI (SI-RNTI): used for PDSCH scheduling where system information is sent Interruption RNTI (INT-RNTI): used to indicate whether puncturing has been applied to PDSCH

[0157] Transmit Power Control for PUSCH RNTI (TPC-PUSCH-RNTI): used to indicate the power control command for PUSCH

[0158] Transmit Power Control for PUCCH RNTI (TPC-PUCCH-RNTI): used to indicate the power control command for PUCCH

[0159] Transmit Power Control for SRS RNTI (TPC-SRS-RNTI): used to indicate the power control command for SRS

[0160] The DCI format specified above may follow the following definition.

[0161] [Table 10]

[0162]

[0163]

[0164] In 5G, the search space of aggregation level L in control resource set p and search space set s can be expressed as in Equation 2 below.

[0165] [Equation 2]

[0166]

[0167] -L: aggregation level

[0168] -n CI : Carrier index

[0169] -N CCE，p : Controls the total number of CCEs in resource set p

[0170] Time slot index

[0171] Number of PDCCH candidates at aggregation level L

[0172] PDCCH candidate index for aggregation level L

[0173] -i=0,...,L-1

[0174] Y p，-1 =n RNTI ≠0, for pmod3=0, A p =39827, for pmod3 = 1, A p =39829, for pmod3 = 2, A P =39839, D=65537

[0175] -n RNTI : Terminal identifier

[0176] In the case of a common search space, the value Can correspond to 0.

[0177] In case of UE-specific search space, It may correspond to a value that changes depending on the identity of the terminal (C-RNTI or ID configured by the base station to the terminal) and the time index.

[0178] In 5G, since multiple search space sets can be configured with different parameters (e.g., the parameters in Table 9), the set of search space sets monitored by the terminal at each time point can be different. For example, if search space set #1 is configured with an X time slot period, search space set #2 is configured with a Y time slot period, and X and Y are different, the terminal can monitor both search space set #1 and search space set #2 in a specific time slot, or can monitor search space set #1 or search space set #2 in a specific time slot.

[0179] [PDCCH: span]

[0180] When there are multiple PDCCH monitoring positions in a time slot, the terminal can perform UE capability reporting for each subcarrier spacing, and at this time, the concept of span can be used. The span refers to the continuous symbols of the PDCCH that the terminal can monitor in the time slot, and each PDCCH monitoring position is within a span. The span can be expressed as (X, Y), where X refers to the minimum number of symbols that must be spaced between the first symbol of two consecutive spans, and Y refers to the number of continuous symbols that can monitor the PDCCH in one span. In this case, the terminal can monitor the PDCCH in a segment of Y symbols from the first symbol of the span within the span.

[0181] Figure 5b 1 is a diagram showing a case where a terminal can have multiple PDCCH monitoring positions within a time slot in a wireless communication system by span. The span can be (X, Y) = (7, 3), (4, 3) and (2, 2), and each of the three cases has Figure 5b , (5-1-00), (5-1-05), and (5-1-10). For example, (5-1-00) indicates a case where there are two spans (which can be expressed as (7, 4)) in a time slot. The interval between the first symbols of the two spans is expressed as X=7, and the PDCCH monitoring position can exist within a total of Y=3 symbols from the first symbol of each span, and search spaces 1 and 2 are shown to exist within Y=3 symbols each. As another example, (5-1-05) indicates a case where there are a total of three spans (which can be expressed as (4, 3)) in a time slot, and the interval between the second span and the third span is X'=5 symbols, which is greater than X=4.

[0182] [PDCCH: UE capability report]

[0183] The time slot positions where the common search space and the UE-specific search space are located are indicated by the monitoringSymbolsWithinSlot parameter of Table 11-1, and the symbol positions within the time slot are indicated as a bitmap by the monitoringSymbolsWithinSlot parameter of Table 9. At the same time, the symbol positions within the time slots where the terminal can monitor the search space can be reported to the base station through the following UE capabilities.

[0184] -UE capability 1 (hereinafter referred to as FG 3-1). This UE capability refers to the ability to monitor the monitoring opportunity (MO) of type 1 and type 3 common search spaces or UE-specific search spaces when one MO is present in the time slot and the MO is located within the first three symbols of the time slot, as shown in Table 9a below. This UE capability is a mandatory capability that all terminals supporting NR must support, and whether the capability is supported is not explicitly reported to the base station.

[0185] [Table 11-1]

[0186]

[0187] -UE capability 2 (hereinafter referred to as FG 3-2). If there is one MO for the common search space or the UE-specific search space in the time slot, the UE capability refers to the ability to monitor regardless of the starting symbol position of the MO, as shown in Table 11-2 below. This UE capability can be optionally supported by the terminal, and whether the capability is supported is explicitly reported to the base station.

[0188] [Table 11-2]

[0189]

[0190] -UE capability 3 (hereinafter referred to as FG 3-5, 3-5a, 3-5b). This UE capability indicates the pattern of multiple monitoring opportunities (MO) that the terminal can monitor when there are multiple MOs for the common search space or UE-specific search space in the time slot, as shown in Table 11-3 below. The above pattern consists of the interval X between the starting symbols between different MOs and the maximum symbol length Y of the MO. The combination of (X, Y) supported by the terminal can be one or more of {(2, 2), (4, 3), (7, 3)}. This UE capability can be optionally supported by the terminal, and whether the capability is supported and the above combination of (X, Y) are explicitly reported to the base station.

[0191] [Table 11-3]

[0192]

[0193]

[0194] The terminal can report to the base station whether it supports the above-mentioned UE capability 2 and / or UE capability 3 and related parameters. The base station can perform time domain resource allocation for the common search space and the UE-specific search space based on the reported UE capabilities. When allocating resources, the base station can prevent the terminal from positioning the MO in a position that cannot be monitored.

[0195] [PDCCH: BD / CCE restriction]

[0196] When multiple search space sets are configured for a terminal, the following conditions may be considered when determining the search space set that the terminal should monitor.

[0197] If the terminal has configured the value of monitoringCapabilityConfig-r16 as upper layer signaling to r15monitoringcapability, the terminal defines the maximum number of PDCCH candidates that can be monitored per time slot and the number of CCEs constituting the entire search space (where the entire search space means the entire set of CCEs corresponding to the union area of ​​multiple search space sets), and if the value of monitoringCapabilityConfig-r16 is configured to r16monitoringcapability, the terminal defines the maximum number of PDCCH candidates that can be monitored per span and the number of CCEs constituting the entire search space (where the entire search space means the entire set of CCEs corresponding to the union area of ​​multiple search space sets).

[0198] [Condition 1: Maximum number of PDCCH candidates limited]

[0199] As described above, depending on the configuration value of the upper layer signaling, the maximum number of PDCCH candidates that the terminal can monitor is M μ When configured as 15·2 μ When defined on a slot basis in a cell with a subcarrier spacing of kHz, the following Table 12-1 may be followed, and when defined on a span basis, the following Table 12-2 may be followed.

[0200] [Table 12-1]

[0201]

[0202] [Table 12-2]

[0203]

[0204] [Condition 2: Maximum CCE quantity limit]

[0205] As described above, depending on the configuration value of the upper layer signaling, the maximum number Cμ of CCEs constituting the entire search space (here, the entire search space means the entire CCE set corresponding to the union area of ​​multiple search space sets) can follow the following Table 12-3 when defined on a time slot basis in a cell configured with a subcarrier spacing of 15·2μkHz, and can follow the following Table 12-4 when defined on a span basis.

[0206] [Table 12-3]

[0207] μ Maximum number of non-overlapping CCEs per timeslot and per serving cell (Cμ) 0 56 1 56 2 48 3 32

[0208] [Table 12-4]

[0209]

[0210] For ease of explanation, let us define a case where both conditions 1 and 2 are satisfied at a specific time point as “condition A.” Therefore, not satisfying condition A may mean that at least one of conditions 1 and 2 is not satisfied.

[0211] [PDCCH: overbook]

[0212] Depending on the configuration of the search space set of the base station, there may be a situation where condition A is not satisfied at a specific point in time. If condition A is not satisfied at a specific point in time, the terminal may select and monitor only some of the search space sets configured to satisfy condition A at that point in time, and the base station may send the PDCCH through the selected search space set.

[0213] The following methods can be used to select a portion of the search space from the entire set of search spaces.

[0214] If condition A of PDCCH is not met at a specific time point (time slot), the terminal (or base station) may preferentially select a search space set whose search space type is configured as a common search space from the search space set existing at that time point, rather than a search space set configured as a UE-specific search space.

[0215] If all search space sets configured as common search spaces are selected (i.e., if condition A is satisfied even after all search spaces configured as common search spaces are selected), the terminal (or base station) may select a search space set configured as a UE-specific search space. At this time, if there are multiple search space sets configured as UE-specific search spaces, a search space set with a lower search space set index may have a higher priority. In consideration of the priority, a UE-specific search space set may be selected within the range where condition A is satisfied.

[0216] [QCL, TCI status]

[0217] In a wireless communication system, one or more different antenna ports (or one or more channels, signals and combinations thereof, but for convenience, collectively referred to as different antenna ports below) can be associated with each other through a quasi co-location (QCL) configuration as shown in Table 10 below. The TCI state is intended to notify the QCL relationship between the PDCCH (or PDCCH DMRS) and other RS ​​or channels, and when the reference antenna port A (reference RS#A) and another target antenna port B (target RS#B) are QCL, this means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated at antenna port A to the channel measurement from antenna port B. QCL may need to associate different parameters depending on the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Therefore, NR supports four types of QCL relationships, as shown in Table 13 below.

[0218] [Table 13]

[0219] QCL Type Large-scale features A Doppler shift, Doppler spread, average delay, delay spread B Doppler shift, Doppler spread C Doppler shift, average delay D Space Rx parameters

[0220] Spatial RX parameters may collectively refer to any or all of various parameters, such as angle of arrival (AoA), power angular spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, spatial channel correlation, etc.

[0221] The QCL relationship can be configured to the terminal through the RRC parameters TCI-State and QCL-Info, as shown in Table 14 below. Referring to Table 14, the base station can configure one or more TCI states to notify the terminal of up to two QCL relationships (qcl-Type1, qcl-Type2) of the RS (ie, target RS) of the ID of the reference TCI state. At this time, each QCL information (QCL-Info) included in each TCI state includes the serving cell index and BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in Table 13.

[0222] [Table 14]

[0223]

[0224] Figure 7 is a diagram showing an example of base station beam allocation according to TCI state configuration. Figure 7 , the base station can transmit information about different N beams to the terminal through different N TCI states. Figure 7In the case of N=3 shown, the base station can convey that the antenna ports referring to the three TCI states 700, 705 and 710 have different spatial Rx parameters, i.e., different beams, by ensuring that the qcl-Type2 parameters included in the three TCI states 700, 705 and 710 are associated with CSI-RS or SSB corresponding to different beams and are configured as QCL type D.

[0225] The following Tables 15-1 to 15-5 show valid TCI state configurations according to the target antenna port type.

[0226] Table 15-1 shows the valid TCI state configuration when the target antenna port is a CSI-RS (TRS) for tracking. TRS refers to an NZP CSI-RS in which the repetition parameter is not configured and trs-Info is configured as true in the CSI-RS. Configuration number 3 in Table 15-1 can be used for aperiodic TRS.

[0227] [Table 15-1] Valid TCI state configuration when the target antenna port is CSI-RS (TRS) for tracking

[0228]

[0229] Table 15-2 shows the valid TCI state configuration when the target antenna port is a CSI-RS for CSI. The CSI-RS for CSI refers to an NZP CSI-RS in which a parameter indicating repetition (e.g., a repetition parameter) is not configured and trs-Info is not configured as true in the CSI-RS.

[0230] [Table 15-2] Valid TCI state configuration when the target antenna port is CSI-RS for CSI

[0231]

[0232] Table 15-3 shows the valid TCI state configuration when the target antenna port is a CSI-RS for beam management (BM) (which has the same meaning as the CSI-RS for L1 RSRP reporting). CSI-RS for BM refers to an NZP CSI-RS in which the repetition parameter is configured and has a value of On or Off and trs-Info is not configured as true in the CSI-RS.

[0233] [Table 15-3] Valid TCI state configuration when the target antenna port is CSI-RS for BM (for L1 RSRP reporting)

[0234]

[0235] Table 15-4 shows the valid TCI state configuration when the target antenna port is PDCCH DMRS.

[0236] [Table 15-4] Valid TCI state configuration when the target antenna port is PDCCH DMRS

[0237]

[0238] Table 15-5 shows the valid TCI state configuration when the target antenna port is PDSCH DMRS.

[0239] [Table 15-5] Valid TCI state configuration when the target antenna port is PDSCH DMRS

[0240]

[0241] A representative QCL configuration method according to Tables 15-1 to 15-5 is to configure the target antenna port and the reference antenna port of each step as "SSB" -> "TRS" -> "CSI-RS for CSI, or CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS". This allows the statistical features measured from SSB and TRS to be linked to each antenna port to assist the reception operation of the terminal.

[0242] [PDCCH: TCI status related]

[0243] Specifically, the TCI state combinations applicable to the PDCCH DMRS antenna ports are shown in the following Table 16. The fourth row in Table 16 is a combination assumed by the terminal before RRC configuration, and configuration after RRC is impossible.

[0244] [Table 16]

[0245]

[0246] NR supports a layered signaling approach such as Figure 8 As shown, it is used for dynamic allocation of PDCCH beams. Figure 8 , the base station may configure N TCI states 805, 810, ..., 820 to the terminal through RRC signaling 800, some of which may be configured as the TCI state 825 of the CORESET. The base station may then indicate one of the TCI states 830, 835, and 840 of the CORESET to the terminal through MAC CE signaling 845. Then, the terminal receives the PDCCH based on the beam information including the TCI state indicated by the MAC CE signaling.

[0247] Fig. 9is a diagram showing a TCI indication MAC CE signaling structure for PDCCH DMRS. Fig. 9 , TCI indication MAC CE signaling for PDCCH DMRS consists of 2 bytes (16 bits) and includes a 5-bit serving cell ID 915, a 4-bit CORESET ID 920 and a 7-bit TCI state ID 925.

[0248] Fig.10 is a diagram showing an example of a beam configuration of a control resource set (CORESET) and a search space according to the above description. Fig.10 , the base station may indicate one 1005 of the TCI state list included in the CORESET 1000 configuration through MAC CE signaling. Thereafter, until a different TCI state is subsequently indicated to the CORESET through another MAC CE signaling, the terminal considers that the same QCL information (beam #1) 1005 is applicable to all one or more search spaces 1010, 1015, and 1020 associated with the CORESET. The above-mentioned PDCCH beam allocation method has the disadvantage that it is difficult to indicate a beam change faster than the MAC CE signaling delay, and also has the disadvantage that the same beam is applied to all CORESETs regardless of the search space characteristics, which makes it difficult to operate a flexible PDCCH beam. The following embodiments of the present invention provide a more flexible PDCCH beam configuration and operation method. Hereinafter, when describing the embodiments of the present invention below, several different examples are provided for the convenience of explanation, but they are not mutually exclusive and may be appropriately combined with each other depending on the situation.

[0249] The base station can configure one or more TCI states of a specific control area to the terminal, and can activate one of the configured TCI states through a MAC CE activation command. For example, if control area #1 has {TCI state #0, TCI state #1, TCI state #2} configured as the TCI state of control area #1, the base station can send a command to the terminal through MAC CE to enable the terminal to assume TCI state #0 as the TCI state of control area #1. Based on the activation command for the TCI state received by the MAC CE, the terminal can correctly receive the DMRS of the corresponding control area based on the QCL information in the activated TCI state.

[0250] For a control region with an index configured as 0 (control region #0), if the terminal does not receive a MAC CE activation command for the TCI state of control region #0, the terminal may assume that the DMRS sent from control region #0 is QCL with the SS / PBCH block identified during the initial access procedure or in a non-contention-based random access procedure not triggered by a PDCCH command.

[0251] For a control region having an index configured as a value other than 0 (control region #X), if the terminal has not yet received a TCI state for control region #X, or if it has received one or more TCI states but has not yet received a MAC CE activation command to activate one of them, the terminal may assume that the DMRS sent from control region #X is QCL with the SS / PBCH block identified during the initial connection process.

[0252] [PDCCH: QCL prioritization rules related]

[0253] Hereinafter, a QCL priority determination operation of a PDCCH will be described in detail.

[0254] If the terminal operates in a single cell or with intra-band carrier aggregation, and multiple control resource sets within the activated bandwidth portion of a single or multiple cells overlap in time with the same or different QCL type D (QCL-TypeD) attributes in a specific PDCCH monitoring opportunity, the terminal can select a specific control resource set according to the QCL prioritization operation and monitor the control resource set having the same QCL type D attribute as the corresponding control resource set. In other words, when multiple control resource sets overlap in time, only one QCL type D attribute can be received. In this case, the criteria for determining the QCL priority can be as follows.

[0255] - Criterion 1. Within a cell corresponding to the lowest index of cells comprising a common search space, a control resource set is associated with the lowest indexed common search space.

[0256] - Criterion 2. Within a cell corresponding to the lowest index of cells comprising a UE-specific search space, the control resource set is associated with the lowest-indexed UE-specific search space.

[0257] As described above, for each of the above criteria, if the corresponding criterion is not satisfied, the next criterion should be applied. For example, if the control resource sets overlap in time in a specific PDCCH monitoring opportunity, and if all control resource sets are connected to the UE-specific search interval and not to the common search interval, that is, if criterion 1 is not satisfied, the terminal can omit the application of criterion 1 and apply criterion 2.

[0258] When selecting a control resource set according to the above criteria, the terminal may additionally consider the following two points about the QCL information configured in the control resource set. First, if control resource set 1 has CSI-RS1 as a reference signal with a QCL type D relationship, the reference signal with which CSI-RS1 has a QCL type D relationship is SSB 1, and another control resource set 2 has a reference signal with a QCL type D relationship with SSB 1, the terminal may consider that the two control resource sets 1 and 2 have different QCL type D characteristics. Second, if control resource set 1 has CSI-RS1 configured in cell 1 as a reference signal with a QCL type D relationship, the reference signal with which CSI-RS1 has a QCL type D relationship is SSB 1, control resource set 2 has CSI-RS2 configured in cell 2 as a reference signal with a QCL type D relationship, and the reference signal with which CSI-RS2 has a QCL type D relationship is the same SSB 1, the terminal may consider that the two control resource sets have the same QCL type D characteristics.

[0259] Fig.12It is a diagram for explaining a method for selecting a control resource set that can be received by a terminal in a wireless communication system according to an embodiment of the present disclosure, taking into account a priority when receiving a downlink control channel. For example, the terminal may be configured to receive multiple control resource sets that overlap in time in a specific PDCCH monitoring opportunity 1210, and these multiple control resource sets may be connected to a common search space or a UE-specific search space for multiple cells. In the corresponding PDCCH monitoring opportunity, a first control resource set 1215 connected to a first common search segment may exist in a first bandwidth portion 1200 of the first cell, and a first control resource set 1220 connected to the first common search segment and a second control resource set 1225 connected to a second UE-specific search segment may exist in a first bandwidth portion 1205 of the second cell. The control resource sets 1215 and 1220 may have a QCL type D relationship with a first CSI-RS resource set within the first bandwidth portion of the first cell, and the control resource set 1225 may have a QCL type D relationship with a first CSI-RS resource set within the first bandwidth portion of the second cell. Therefore, if criterion 1 is applied to the corresponding PDCCH monitoring opportunity 1210, all other control resource sets having reference signals of the same QCL type D as the first control resource set 1215 may be received. Therefore, the terminal may receive control resource sets 1215 and 1220 in the corresponding PDCCH monitoring opportunity 1210. As another example, the terminal may be configured to receive multiple control resource sets overlapping in time in a specific PDCCH monitoring opportunity 1240, and these multiple control resource sets may be connected to a common search space or a UE-specific search space for multiple cells. Within the PDCCH monitoring opportunity, in the first bandwidth part 1230 of the first cell, there may be a first control resource set 1245 connected to the first UE-specific search interval and a second control resource set 1250 connected to the second UE-specific search interval, and in the first bandwidth part 1235 of the second cell, there may be a first control resource set 1255 connected to the first UE-specific search interval and a second control resource set 1260 connected to the third UE-specific search interval. Control resource sets 1245 and 1250 have a relationship with a first CSI-RS resource set in a first bandwidth portion of a first cell and are of QCL type D, control resource set 1255 has a relationship with a first CSI-RS resource set in a first bandwidth portion of a second cell and is of QCL type D, and control resource set 1260 may have a relationship with a second CSI-RS resource set in a first bandwidth portion of a second cell and is of QCL type D. However, if criterion 1 is applied to the corresponding PDCCH monitoring opportunity 1240, there is no common search segment, so the next criterion, criterion 2, may be applied.If criterion 2 is applied to the corresponding PDCCH monitoring opportunity 1240, all other control resource sets having reference signals of the same QCL type D as the control resource set 1245 may be received. Therefore, the terminal may receive the control resource sets 1245 and 1250 in the corresponding PDCCH monitoring opportunity 1240.

[0260] [Rate matching / puncturing related]

[0261] Hereinafter, the rate matching operation and the puncturing operation are described in detail.

[0262] When time and frequency resource A used to send an arbitrary symbol sequence A overlaps with an arbitrary time and frequency resource B, the rate matching or puncturing operation can be considered as a transmission and reception operation of channel A taking into account resource C (the area where resource A and resource B overlap).

[0263] Rate Matching Operation

[0264] -The base station may map and transmit channel A only for the remaining resource region excluding resource C corresponding to the region overlapping with resource B in the entire resource A to which the symbol sequence A is intended to be transmitted to the terminal. For example, if the symbol sequence A consists of {symbol #1, symbol #2, symbol #3, symbol #4}, and if resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the base station may sequentially map and transmit the symbol sequence A to the remaining resources {resource #1, resource #2, resource #4} excluding {resource #3} corresponding to resource C in resource A. Therefore, the base station may transmit the symbol sequence {symbol #1, symbol #2, symbol #3} by mapping the symbol sequence {symbol #1, symbol #2, symbol #3} to {resource #1, resource #2, resource #4}, respectively.

[0265] The terminal may determine resource A and resource B according to scheduling information for symbol sequence A from the base station, and may thereby determine resource C, which is an area where resource A and resource B overlap. The terminal may receive symbol sequence A assuming that symbol sequence A is mapped and transmitted in the remaining area except resource C in the entire resource A. For example, if symbol sequence A is composed of {symbol #1, symbol #2, symbol #3, symbol #4}, and resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the terminal may receive symbol sequence A assuming that symbol sequence A is sequentially mapped to {resource #1, resource #2, resource #4}, which are the remaining resources in resource A except {resource #3} corresponding to resource C. Therefore, the terminal may assume that the symbol sequence {symbol #1, symbol #2, symbol #3} is transmitted by being respectively mapped to {resource #1, resource #2, resource #4}, and perform a series of subsequent reception operations.

[0266] Punching operation

[0267] If the base station wants to transmit a symbol sequence A to the terminal, and there is a resource C corresponding to a region overlapping with resource B in the entire resource A, the base station maps the symbol sequence A to the entire resource A, but does not perform transmission in the resource region corresponding to resource C, and may perform transmission only for the remaining resource region of resource A excluding resource C. For example, if the symbol sequence A consists of {symbol #1, symbol #2, symbol #3, symbol #4}, and resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the base station may map the symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} to resource A {resource #1, resource #2, resource #3, resource #4}, respectively, and may transmit only the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the remaining resources {resource #1, resource #2, resource #4} in resource A excluding {resource #3} corresponding to resource C, and may not transmit {symbol #3} mapped to {resource #3} corresponding to resource C. Therefore, the base station can send the symbol sequence {symbol #1, symbol #2, symbol #4} by mapping the symbol sequence {symbol #1, symbol #2, symbol #4} to {resource #1, resource #2, resource #4} respectively.

[0268] The terminal can determine resources A and B based on the scheduling information for symbol sequence A from the base station, and through this, determine resource C, which is the area where resources A and B overlap. The terminal can receive symbol sequence A, assuming that symbol sequence A is mapped to the entire resource A, but is only sent in the remaining area of ​​resource area A excluding resource C. For example, if symbol sequence A consists of {symbol #1, symbol #2, symbol #3, symbol #4}, and resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the terminal may 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 {symbol #3} mapped to {resource #3} corresponding to resource C is not transmitted, and the terminal may perform reception assuming that the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the remaining resources in resource A except {resource #3} corresponding to resource C, that is, {resource #1, resource #2, resource #4} is mapped and transmitted. Therefore, the terminal may assume that the symbol sequence {symbol #1, symbol #2, symbol #4} is transmitted by being mapped to {resource #1, resource #2, resource #4}, respectively, and perform a series of subsequent reception operations.

[0269] In the following, a method for configuring rate matching resources for the purpose of rate matching in a 5G communication system is described. Rate matching refers to adjusting the size of a signal taking into account the amount of resources that can transmit the signal. For example, rate matching of a data channel may refer to adjusting the size of the data accordingly without mapping and transmitting the data channel for a specific time and frequency resource region.

[0270] Fig.11 is a diagram explaining a method in which a base station and a terminal transmit and receive data while considering a downlink data channel and a rate matching resource.

[0271] Fig.11A downlink data channel (PDSCH) 1101 and a rate matching resource 1102 are shown. The base station can configure one or more rate matching resources 1102 to the terminal through upper layer signaling (e.g., RRC signaling). The rate matching resource 1102 configuration information may include time domain resource allocation information 1103, frequency domain resource allocation information 1104, and period information 1105. In the following, the bitmap corresponding to the frequency domain resource allocation information 1104 is referred to as a "first bitmap", the bitmap corresponding to the time domain resource allocation information 1103 is referred to as a "second bitmap", and the bitmap corresponding to the period information 1105 is referred to as a "third bitmap". If all or part of the time and frequency resources of the scheduled data channel 1101 overlap with the configured rate matching resource 602, the base station can perform rate matching in the rate matching resource 1102 part and send the data channel 1101, and the terminal can perform reception and decoding after assuming that the data channel 1101 is rate matched in the rate matching resource 1102 part.

[0272] The base station can dynamically notify the terminal through DCI whether to perform rate matching on the data channel in the configured rate matching resource part through additional configuration (corresponding to the "rate matching indicator" in the above-mentioned DCI format). Specifically, the base station can select some of the configured rate matching resources and group them into rate matching resource groups, and can use a bitmap method to indicate to the terminal through DCI whether to perform rate matching on the data channel for each rate matching resource group. For example, if 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}, RMG#2={RMR#3, RMR#4} as rate matching groups, and can use 2 bits in the DCI field as a bitmap to indicate to the terminal whether to perform rate matching in RMG#1 and RMG#2 respectively. For example, if rate matching is required, it can be indicated as "1", and if rate matching is not required, it can be indicated as "0".

[0273] In 5G, the granularity of "RB symbol level" and "RE level" is supported by configuring the aforementioned rate matching resources to the terminal. More specifically, the following configuration method can be followed.

[0274] RB symbol level

[0275] The terminal may configure up to four rate matching patterns (RateMatchPattern) for each bandwidth part through upper layer signaling, and a RateMatchPattern may include the following contents.

[0276] -As a reserved resource within a bandwidth part, a resource in which time domain and frequency domain resources of the reserved resource are configured by combining a bitmap of the RB level and a bitmap of the symbol level along the frequency domain may be included. The reserved resource may span one or two time slots. A time domain pattern (periodicityAndPattern) in which the time domain and frequency domain composed of each RB level and symbol level bitmap pair are repeated may be additionally configured.

[0277] - It may include time domain and frequency domain resource regions configured as control resource sets within a bandwidth part and resource regions corresponding to a time domain pattern configured as a search space configuration in which the resource regions are repeated.

[0278] RE Level

[0279] The terminal may be configured with the following contents through upper layer signaling.

[0280] - The configuration information (lte-CRS-ToMatchAround) for REs corresponding to the LTE cell-specific reference signal or common reference signal (CRS) pattern may include the number of ports of the LTE CRS (nrofCRS-Ports) and the LTE-CRS-vshift value (v-shift), the position information (carrierFreqDL) of the center subcarrier of the LTE carrier from the reference frequency point (e.g., reference point A), the bandwidth size (carrierBandwidthDL) information of the LTE carrier, and the subframe configuration information (mbsfn-SubframConfigList) corresponding to the multicast-broadcast single frequency network (MBSFN). Based on the above information, the terminal can determine the position of the CRS in the NR time slot corresponding to the LTE subframe.

[0281] - It may include configuration information for resource sets corresponding to one or more zero-power (ZP) CSI-RS within a bandwidth part.

[0282] [LTE CRS rate matching related]

[0283] Next, the rate matching process for the above-mentioned LTE CRS will be described in detail. In order to coexist between long-term evolution (LTE) and new RAT (NR), NR provides the NR terminal with the function of configuring the mode of LTE cell-specific reference signal (CRS). More specifically, the CRS mode can be provided by RRC signaling including at least one parameter in the ServingCellConfig information element (IE) or ServingCellConfigCommonIE. Examples of parameters may include lte-CRS-ToMatchAround, lte-CRS-PatternList1-r16, lte-CRS-PatternList2-r16, crs-RateMatch-PerCORESETPoolIndex-r16, etc.

[0284] In Rel-15NR, the lte-CRS-ToMatchAround parameter provides a function that allows one CRS pattern to be configured for each serving cell. In Rel-16NR, this function is extended to allow multiple CRS patterns to be configured for each serving cell. More specifically, in a terminal configured with a single transmit and receive point (TRP), one CRS pattern can be configured for each LTE carrier, and in a terminal configured with multiple TRPs, two CRS patterns can be configured for each LTE carrier. For example, in a terminal configured with a single TRP, up to three CRS patterns can be configured for each serving cell through the lte-CRS-PatternList1-r16 parameter. In another example, in a terminal configured with multiple TRPs, CRS can be configured for each TRP. That is, the CRS pattern of TRP1 can be configured by the lte-CRS-PatternList1-r16 parameter, and the CRS pattern of TRP2 can be configured by the lte-CRS-PatternList2-r16 parameter. Meanwhile, when two TRPs are configured as above, the crs-RateMatch-PerCORESETPoolIndex-r16 parameter is used to determine whether both the CRS patterns of TRP1 and TRP2 or only the CRS pattern of one TRP is applied to a specific physical downlink shared channel (PDSCH). If the crs-RateMatch-PerCORESETPoolIndex-r16 parameter is configured to be enabled, only the CRS pattern of one TRP is applied, and in other cases, the CRS patterns of both TRPs are applied.

[0285] Table 17 shows the ServingCellConfig IE including the above-mentioned CRS pattern, and Table 18 shows the RateMatchPatternLTE-CRS IE including at least one parameter of the CRS pattern.

[0286] [Table 17]

[0287]

[0288]

[0289] [Table 18]

[0290]

[0291] [PDSCH: frequency resource allocation related]

[0292] Fig.13 is a diagram showing an example of frequency domain resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to one embodiment of the present disclosure.

[0293] Fig.13 It is a diagram showing three frequency domain resource allocation methods (type 0 13-00, type 1 13-05, and dynamic switching 13-10) that can be configured by high layers in an NR wireless communication system.

[0294] refer to Fig.13 , if the terminal is configured to use only resource type 0 13-00 through upper layer signaling, some downlink control information (DCI) of PDSCH allocated to the terminal includes a bitmap consisting of NRBG bits. Its conditions will be explained later. At this time, NRBG refers to the number of resource block groups (RBGs) determined according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size as shown in [Table 19] below, and data is sent to the RBG indicated by the bitmap as 1.

[0295] [Table 19]

[0296] Bandwidth portion size Configuration 1 Configuration 2 1-36 2 4 37-72 4 8 73-144 8 16 145--275 16 16

[0297] If the terminal is configured to use only resource type 113-05 through upper layer signaling, some DCIs of PDSCH allocated to the terminal include The frequency domain resource allocation information is composed of bits. The conditions will be explained later. Thus, the base station can configure the starting VRB 13-20 and the length 13-25 of the frequency domain resources allocated therefrom in sequence.

[0298] If the terminal is configured to use resource type 0 and resource type 113-10 at the same time through upper layer signaling, some DCIs for allocating PDSCH to the terminal include frequency domain resource allocation information consisting of a payload 13-15 for configuring resource type 0 and a larger value 13-35 of payloads 13-20 and 13-25 for configuring resource type 1. The conditions will be explained later. At this time, one bit may be added to the most significant bit (MSB) of the frequency domain resource allocation information in the DCI, and if the bit has a value of "0", it may indicate the use of resource type 0, and if it has a value of "1", it may indicate the use of resource type 1.

[0299] [PDSCH / PUSCH: Time resource allocation related]

[0300] Hereinafter, a time domain resource allocation method for a data channel in a next-generation mobile communication system (5G or NR system) is described.

[0301] The base station can configure a table of time domain resource allocation information for a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH) to the terminal through high-level signaling (e.g., RRC signaling). A table with a maximum of maxNrofDL-Allocations=16 entries can be configured for PDSCH, and a table with a maximum of maxNrofDL-Allocations=16 entries can be configured for PUSCH. In one embodiment, the time domain resource allocation information may include PDCCH to PDSCH time slot timing (corresponding to the time interval in time slots between the time point when the PDCCH is received and the time point when the PDSCH scheduled by the received PDCCH is sent, denoted as K0), PDCCH to PUSCH time slot timing (corresponding to the time point when the PDCCH is received and the time point when the PUSCH scheduled by the received PDCCH is sent, denoted as K2), information about the position and length of the starting symbol in which the PDSCH or PUSCH is scheduled in the time slot, the mapping type of the PDSCH or PUSCH, etc. For example, information such as the following [Table 20] or [Table 21] may be transmitted from the base station to the terminal.

[0302] [Table 20]

[0303]

[0304] [Table 21]

[0305]

[0306] The base station may notify the terminal of one of the entries in the table of the above-mentioned time domain resource allocation information through L1 signaling (e.g., DCI) (e.g., it may be indicated by the "time domain resource allocation" field in the DCI). The terminal may obtain the time domain resource allocation information for PDSCH or PUSCH based on the DCI received from the base station.

[0307] Fig.14 is a diagram showing an example of time domain resource allocation of a PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0308] refer to Fig.14 The base station can use the subcarrier spacing (SCS) (μ PDSCH , μ PDCCH ), the scheduling offset K0 value, and the starting position 14-00 and length 14-05 of the OFDM symbol within the time slot dynamically indicated by DCI to indicate the time domain position of the PDSCH resource.

[0309] Fig.15 is a diagram showing an example of time domain resource allocation according to subcarrier spacing of a data channel and a control channel in a wireless communication system according to one embodiment of the present disclosure.

[0310] refer to Fig.15 , when the subcarrier spacing of the data channel and the control channel is the same 15-00 (μ PDSCH =μ PDCCH ), since the time slot numbers for data and control are the same, the base station and the terminal can generate a scheduling offset according to the predetermined time slot offset K0. On the other hand, when the subcarrier spacing of the data channel and the control channel is different by 15-05 (μ PDSCH ≠μ PDCCH ), since the time slot numbers used for data and control are different, the base station and the terminal can generate a scheduling offset based on the subcarrier spacing of the PDCCH and according to the predetermined time slot offset K0.

[0311] [PDSCH: Processing time]

[0312] Next, the PDSCH processing time is described. When the base station schedules the terminal to transmit PDSCH using DCI format 1_0, 1_1 or 1_2, the terminal may need the PDSCH processing time to receive the PDSCH by applying the transmission method indicated by DCI (modulation and coding instruction index (MCS), demodulation reference signal related information, time and frequency resource allocation information, etc.). NR defines the PDSCH processing time in consideration of this. The PDSCH processing time of the terminal can follow the following [Equation 3].

[0313] [Equation 3]

[0314] T proc,1 =(N 1 +d 1,1 +d 2 )(2048+144)κ2 -μ T c +T ext

[0315] T described in Equation 3 proc,1 Each value of can have the following meanings.

[0316] -N 1 : The number of symbols determined by UE processing capability 1 or 2 and parameter set μ according to the capability of the terminal. If the UE processing capability is reported as 1 according to the capability report of the terminal, it may have the value of [Table 22], and if the UE processing capability is reported as 2 and it is configured through upper layer signaling that UE processing capability 2 can be used, it may have the value of [Table 23]. The parameter set μ may correspond to μ PDCCH , μ PDSCH and μ UL The minimum value in order to maximize T proc,1 , and μ PDCCH , μ PDSCH and μ UL They may respectively refer to a parameter set of a PDCCH that schedules a PDSCH, a parameter set of a scheduled PDSCH, and a parameter set of an uplink channel on which HARQ-ACK is to be sent.

[0317] [Table 22] PDSCH processing time when PDSCH processing capability is 1.

[0318]

[0319] [Table 23] PDSCH processing time when the PDSCH processing capability is 2.

[0320]

[0321] -κ: 64

[0322] -T ext : If the terminal uses the shared spectrum channel access method, the terminal can calculate T ext And apply it to the PDSCH processing time. Otherwise, T ext is assumed to be 0.

[0323] - l indicating the PDSCH DMRS position value 1 is 12, and N in the above [Table 22] 1,0 has the value 14, otherwise it has the value 13.

[0324] - For PDSCH mapping type A, if the last symbol of the PDSCH is the i-th symbol in the slot in which the PDSCH is transmitted, and i<7, then d 1,1 is 7-i, otherwise d 1,1 It is 0.

[0325] -d 2 : When a PUCCH with a high priority index and a PUCCH or PUSCH with a low priority index overlap in time, the d 2 Can be configured to be the value reported from the terminal. Otherwise, d 2 is 0.

[0326] - If PDSCH mapping type B is used for a terminal with processing capability 1, then d 1,1 The value of may be determined based on the number L of symbols of the scheduled PDSCH and the number d of overlapping symbols between the PDCCH that schedules the PDSCH and the scheduled PDSCH.

[0327] -If L ≥ 7, then d 1,1 =0.

[0328] - If L ≥ 4 and L ≤ 6, then d 1,1 =7-L.

[0329] - If L = 3, then d 1,1 =min(d,1).

[0330] - If L = 2, then d 1,1 =3+d.

[0331] -When PDSCH mapping type B is used for a terminal with processing capability 2, d 1,1 The value of may be determined based on the number L of symbols of the scheduled PDSCH and the number d of overlapping symbols between the PDCCH that schedules the PDSCH and the scheduled PDSCH.

[0332] -If L ≥ 7, then d 1,1 =0.

[0333] - If L ≥ 4 and L ≤ 6, then d 1,1 =7-L.

[0334] -When L=2,

[0335] - If the scheduled PDCCH is present in a CORESET consisting of three symbols, and the CORESET and the scheduled PDSCH have the same starting symbol, then d 1，1 =3.

[0336] - Otherwise, d 1，1 =d.

[0337] -For a terminal supporting capability 2 in a given serving cell, when the terminal configures processingType2Enabled as enabled as the upper layer signaling of the cell, the PDSCH processing time according to the terminal processing capability 2 can be applied.

[0338] If the position of the first uplink transmission symbol of the PUCCH including the HARQ-ACK information (for the corresponding position, K 1 - is defined as the transmission time point of HARQ-ACK, which may take into account the PUCCH resources and timing advance effect used for HARQ-ACK transmission) not earlier than T from the last symbol of PDSCH proc,1 The terminal shall send a valid HARQ-ACK message starting from the first uplink transmission symbol that arrives after the scheduled time. That is, the terminal will send the PUCCH including HARQ-ACK only when the PDSCH processing time is sufficient. Otherwise, the terminal may not provide the base station with valid HARQ-ACK information corresponding to the scheduled PDSCH. proc，1 It can be used for both normal CP and extended CP. In the case where PDSCH has two PDSCH transmission positions in one time slot, d 1，1 It is calculated based on the first PDSCH transmission position in the corresponding time slot.

[0339] [PDSCH: Reception preparation time during cross-carrier scheduling]

[0340] Next, in the case of cross-carrier scheduling, the parameter set μ by which the scheduled PDCCH is transmitted is PDCCH and a parameter set μ through which the PDSCH scheduled by the corresponding PDCCH is transmitted PDSCH Different from each other, it describes the PDSCH reception preparation time N of the terminal defined for the time interval between PDCCH and PDSCH pdsch .

[0341] If μ PDCCH <μ PDSCH , the scheduled PDSCH cannot be earlier than N from the last symbol of the PDCCH that schedules the PDSCH pdsch The corresponding PDSCH transmission symbol may include DM-RS.

[0342] If μ PDCCH >μ PDSCH, then the scheduled PDSCH can be N after the last symbol of the PDCCH that schedules the corresponding PDSCH pdsch The corresponding PDSCH transmission symbol may include DM-RS.

[0343] [Table 23] N according to the scheduled PDCCH subcarrier spacing pdsch

[0344] <![CDATA[μ PDCCH ]]> <![CDATA[N pdsch [Symbol]]]> O 4 1 5 2 10 3 14

[0345] [PDSCH: TCI state activated MAC-CE]

[0346] Next, a method for configuring a beam for PDSCH is studied. Fig.16 A process for configuring and activating a beam for PDSCH is shown. A list of TCI states for PDSCH may be indicated by a list of an upper layer such as RRC (16-00). For each BWP, the list of TCI states may be indicated, for example, by tci-StatesToAddModList and / or tci-StatestOrReleaseList in the PDSCH-Config IE. Next, some of the list of TCI states may be activated by MAC-CE (16-20). The maximum number of TCI states to be activated may be determined based on the capabilities reported by the terminal. 16-50 shows an example of a MAC-CE structure for PDSCH TCI state activation / deactivation.

[0347] The meaning of each field in the above MAC CE and the values ​​that can be configured for each field are as follows.

[0348]

[0349] [PUSCH: Transmission method related]

[0350] Next, a scheduling method for PUSCH transmission is described. PUSCH transmission may be dynamically scheduled by a UL grant in DCI, or may be operated by a configured grant type 1 or type 2. Dynamic scheduling indication for PUSCH transmission is possible in DCI format 0_0 or 0_1.

[0351] Configured grant type 1 PUSCH transmissions may be semi-persistently scheduled by receiving configuredGrantConfig including rrc-ConfiguredUplinkGrant of [Table 25] via higher layer signaling without receiving a UL grant in DCI. Configured grant type 2 PUSCH transmissions may be semi-persistently scheduled by a UL grant in DCI after receiving configuredGrantConfig excluding rrc-ConfiguredUplinkGrant of [Table 25] via higher layer signaling. When PUSCH transmissions operate with a configured grant, the parameters applied to PUSCH transmissions are applied by configuredGrantConfig of [Table 25] via higher layer signaling, except for the scaling of dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, UCI-OnPUSCH provided by pusch-Config of [Table 26]. If the terminal has been provided with transformPrecoder in configuredGrantConfig (which is upper layer signaling of [Table 25]), the terminal applies tp-pi2BPSK in pusch-Config of [Table 26] to PUSCH transmission operated by the configured grant.

[0352] [Table 25]

[0353]

[0354]

[0355] Next, the PUSCH transmission method is described. The DMRS antenna port used for PUSCH transmission is the same as the antenna port used for SRS transmission. PUSCH transmission can follow a codebook-based transmission method and a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in pusch-Config of [Table 26] as upper layer signaling is "codebook" or "non-codebook".

[0356] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically configured by the configured grant. If the terminal is indicated to schedule PUSCH transmission via DCI format 0_0, the terminal performs beam configuration for PUSCH transmission using the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the activated uplink BWP within the serving cell, and at this time, the PUSCH transmission is based on a single antenna port. The UE does not expect to schedule PUSCH transmission via DCI format 0_0 within a BWP in which a PUCCH resource including pucch-spatialRelationInfo is not configured. If the terminal has not been configured with txConfig in pusch-Config of [Table 26], the terminal does not expect to be scheduled with DCI format 0_1.

[0357] [Table 26]

[0358]

[0359] Next, codebook-based PUSCH transmission is described. Codebook-based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can be operated semi-statically through the configured grant. When codebook-based PUSCH is dynamically scheduled through DCI format 0_1 ​​or semi-statically configured through the configured grant, the terminal determines the precoder (precoder) for PUSCH transmission based on the SRS resource indicator (SRI), the transmission precoding matrix indicator (TPMI) and the transmission rank (the number of PUSCH transmission layers).

[0360] At this time, SRI can be given by the field SRS resource indicator in the DCI, or configured by the upper layer signaling srs-ResourceIndicator. When performing codebook-based PUSCH transmission, the terminal is configured with at least one SRS resource and can be configured with up to two SRS resources. When the terminal receives SRI through DCI, the SRS resource indicated by SRI refers to the SRS resource corresponding to SRI in the SRS resource sent before the PDCCH including SRI. In addition, TPMI and transmission rank can be given by the field precoding information and the number of layers in the DCI or configured by upper layer signaling precodingAndNumberOfLayers. TPMI is used to indicate the precoder to be applied to PUSCH transmission. If the terminal is configured with one SRS resource, TPMI is used to indicate the precoder to be applied in one configured SRS resource. When the terminal is configured with multiple SRS resources, TPMI is used to indicate the precoder to be applied in the SRS resource indicated by SRI.

[0361] A precoder to be used for PUSCH transmission is selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in the upper layer signaling SRS-Config. In codebook-based PUSCH transmission, the terminal determines the codebook subset based on the TPMI and codebookSubset in the upper layer signaling pusch-Config. Based on the UE capabilities reported by the terminal to the base station, the codebook subset in the upper layer signaling pusch-Config can be configured as one of "fullyAndPartialAndNonCoherent", "partialAndNonCoherent" or "nonCoherent". If the terminal reports "partialAndNonCoherent" as the UE capability, the terminal does not expect the value of codebookSubset in the upper layer signaling to be configured as "fullyAndPartialAndNonCoherent". In addition, if the terminal reports "nonCoherent" as the UE capability, the terminal does not expect the value of codebookSubset in the upper layer signaling to be configured as "fullyAndPartialAndNonCoherent" or "partialAndNonCoherent". If nrofSRS-Ports in the upper layer signaling SRS-ResourceSet points to two SRS antenna ports, the terminal does not expect the value of codebookSubset in the upper layer signaling to be configured as "partialAndNonCoherent".

[0362] The terminal may receive an SRS resource set, wherein the usage value in the upper layer signaling SRS-ResourceSet is configured as "codebook", and an SRS resource in the corresponding SRS resource set may be indicated by SRI. If multiple SRS resources are configured in the SRS resource set, wherein the usage value in the upper layer signaling SRS-ResourceSet is configured as "codebook", the terminal expects that the value of nrofSRS-Ports in the upper layer signaling SRS-Resource is configured as the same value for all SRS resources.

[0363] The terminal can send one or more SRSs included in an SRS resource set in which the usage value is configured as "codebook" to the base station according to the upper layer signaling, and the base station selects one of the SRS resources sent by the terminal and instructs the terminal to perform PUSCH transmission using the transmit beam information of the corresponding SRS resource. At this time, in the codebook-based PUSCH transmission, SRI is used as information for selecting an index of an SRS resource and is included in the DCI. In addition, the base station includes information indicating the TPMI and rank to be used by the terminal for PUSCH transmission in the DCI. The terminal performs PUSCH transmission using the SRS resource indicated by SRI, the rank indicated by the transmit beam application based on the corresponding SRS resource, and the precoder indicated by TPMI.

[0364] Next, non-codebook based PUSCH transmission is described. Non-codebook based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can be operated semi-statically through the configured grant. If at least one SRS resource is configured in the SRS resource set, where the usage value in the upper layer signaling SRS-ResourceSet is configured as "nonCodebook", the terminal can be scheduled for non-codebook based PUSCH transmission through DCI format 0_1.

[0365] For an SRS resource set in which the usage value in the upper layer signaling SRS-ResourceSet is configured as "nonCodebook", the terminal may be configured with a connected non-zero power (NZP) CSI-RS resource. The terminal may perform calculations on the precoder used for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the aperiodic SRS transmission at the terminal is less than 42 symbols, the terminal does not expect to update information about the precoder used for SRS transmission.

[0366] If the value of resourceType in the upper layer signaling SRS-ResourceSet is configured as "aperiodic", the connected NZP CSI-RS is indicated by the SRS request field in DCI format 0_1 ​​or 1_1. At this time, if the connected NZP CSI-RS resource is a non-periodic NZP CSI-RS resource, when the value of the field SRS request in DCI format 0_1 ​​or 1_1 is not "00", it indicates the presence of a connected NZP CSI-RS. At this time, the DCI shall not indicate cross-carrier or cross-BWP scheduling. In addition, if the value of the SRS request indicates the presence of NZP CSI-RS, the NZP CSI-RS is located in the time slot in which the PDCCH including the SRS request field is sent. At this time, the TCI state configured for the scheduled subcarrier is not configured as QCL type D.

[0367] If a periodic or semi-persistent SRS resource set is configured, the associated NZP CSI-RS may be indicated by the associatedCSI-RS in the upper layer signaling SRS-ResourceSet. For non-codebook based transmission, the terminal does not expect the upper layer signaling spatialRelationInfo for SRS resources to be configured together with the associatedCSI-RS in the upper layer signaling SRS-ResourceSet.

[0368] When multiple SRS resources are configured, the terminal can determine the precoder and transmission rank to be applied to the PUSCH transmission based on the SRI indicated by the base station. At this time, the SRI can be indicated by the SRS resource indicator, the field in the DCI, or configured by the upper layer signaling srs-ResourceIndicator. Similar to the above-mentioned codebook-based PUSCH transmission, when the terminal is provided with SRI through DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI in the SRS resource sent before the PDCCH including the SRI. The terminal can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be sent simultaneously in the same symbol in an SRS resource set and the maximum number of SRS resources are determined by the UE capabilities reported by the terminal to the base station. At this time, the SRS resources sent simultaneously by the UE occupy the same RB. The terminal configures an SRS port for each SRS resource. Only one SRS resource may be configured, which is configured with a usage value configured as "nonCodebook" in the upper layer signaling SRS-ResourceSet, and a maximum of four SRS resources may be configured for non-codebook based PUSCH transmission.

[0369] The base station sends an NZP-CSI-RS associated with the SRS resource set to the terminal, and the terminal calculates the precoder to be used when sending one or more SRS resources in the SRS resource set based on the result of measurement when the NZP-CSI-RS is received. When the terminal sends one or more SRS resources in the SRS resource set whose use is configured as "nonCodebook" to the base station, the terminal applies the calculated precoder, and the base station selects one or more SRS resources from the received one or more SRS resources. At this time, in the non-codebook based PUSCH transmission, SRI represents an index that can express a combination of one or more SRS resources, and SRI is included in the DCI. At this time, the number of SRS resources indicated by the SRI sent by the base station can be the number of transmission layers of the PUSCH, and the terminal sends the PUSCH by applying the precoder applied to the SRS resource transmission for each layer.

[0370] [PUSCH: Preparation process time]

[0371] Next, the PUSCH preparation process time is described. When the base station schedules the terminal to send PUSCH using DCI format 0_0, 0_1 or 0_2, the terminal may need the PUSCH preparation process time to send PUSCH by applying the transmission method indicated by DCI (transmission precoding method of SRS resources, number of transmission layers, spatial domain transmission filter). NR defines the PUSCH preparation process time taking this into account. The PUSCH preparation process time of the UE can follow the following [Equation 4].

[0372] [Equation 4]

[0373] T proc,2 =max((N 2 +d 2,1 +d 2 )(2048+144)κ2 -μ T c +T ext +T switch ,d 2,2 )

[0374] The above T in Equation 4 proc,2 In , each variable can have the following meanings.

[0375] -N 2 : The number of symbols determined by UE processing capability 1 or 2 and parameter set μ according to the capability of the terminal. If the UE processing capability is reported as 1 according to the capability report of the terminal, it can have the value of [Table 27], and if the UE processing capability is reported as 2 and it is configured through upper layer signaling that UE processing capability 2 can be used, it can have the value of [Table 28].

[0376] [Table 27]

[0377] μ <![CDATA[PUSCH preparation time N 2 [Symbol]]]> 0 10 1 12 2 23 3 36

[0378] [Table 28]

[0379] μ <![CDATA[PUSCH preparation time N 2 [Symbol]]]> 0 5 1 5.5 2 For frequency range 1, 11

[0380] -d 2,1 : The number of symbols, which is configured to 0 if all resource elements of the first OFDM symbol of PUSCH transmission are configured to consist of only DM-RS, otherwise it is configured to 1.

[0381] -K:64

[0382] -μ: in μ DL or μ UL In, T proc，2 Take a larger value. DL refers to a downlink parameter set for transmitting a PDCCH including a DCI scheduling a PUSCH, and μ UL Refers to the uplink parameter set for sending PUSCH.

[0383] -T c : It has a value of 1 / (Δf max ·N f ), Δf max =480·10 3 Hz,N f =4096.

[0384] -d 2.2 : If the DCI scheduling PUSCH indicates BWP switching, then the value of BWP switching time is taken. Otherwise, it is 0.

[0385] -d 2 : When a PUCCH overlaps in time with an OFDM symbol of a PUSCH with a high priority index and a PUCCH with a low priority index, the d 2 Otherwise, d 2 is 0.

[0386] -T ext : If the terminal uses the shared spectrum channel access method, the terminal can calculate T ext And apply it to the PUSCH preparation process time. Otherwise, T ext is assumed to be 0.

[0387] -T switch : When the uplink switching interval is triggered, T switchis assumed to be the switching interval. Otherwise, it is assumed to be 0.

[0388] When the base station and the terminal consider the influence of the time domain resource mapping information and the uplink-downlink timing advance of the PUSCH scheduled by the DCI, if the first symbol of the PUSCH is T from the last symbol of the PDCCH including the DCI scheduling the PUSCH proc,2 If the PUSCH preparation time starts before the first uplink symbol after the CP starts, the base station and the terminal determine that the PUSCH preparation time is insufficient. Otherwise, the base station and the terminal determine that the PUSCH preparation time is sufficient. The terminal sends the PUSCH only when the PUSCH preparation time is sufficient, and if the PUSCH preparation time is insufficient, the DCI scheduling the PUSCH can be ignored.

[0389] [PUSCH: Repeated transmission related]

[0390] The following describes in detail the repeated transmission of uplink data channels in the 5G system. The 5G system supports two types of repeated transmission methods for uplink data channels: PUSCH repeated transmission type A and PUSCH repeated transmission type B. The terminal can be configured as PUSCH repeated transmission type A or B through upper layer signaling.

[0391] PUSCH repetition transmission type A

[0392] -As described above, the symbol length and the position of the starting symbol of the uplink data channel are determined by the time domain resource allocation method within one time slot, and the base station can inform the terminal of the number of repeated transmissions through high-layer signaling (such as RRC signaling) or L1 signaling (such as DCI).

[0393] -The terminal may repeatedly transmit an uplink data channel having the same length and starting symbol as an uplink data channel configured based on the number of repeated transmissions received from the base station in consecutive time slots. In this case, if the time slot is configured by the base station to the terminal as a downlink or at least one of the symbols of the uplink data channel configured by the terminal is configured as a downlink, the terminal omits the transmission of the uplink data channel but counts the number of repeated transmissions of the uplink data channel.

[0394] PUSCH repetition transmission type B

[0395] -As described above, the starting symbol and length of the uplink data channel are determined by the time domain resource allocation method within one time slot, and the base station can inform the terminal of the number of repetitions through upper layer signaling (such as RRC signaling) or L1 signaling (such as DCI).

[0396] - First, the nominal repetition of the uplink data channel is determined based on the configured starting symbol and length of the uplink data channel as follows. The time slot where the nth nominal repetition starts is is given by , and the symbol starting in this time slot is given by The time slot where the nth nominal repetition ends is given by is given by , and the symbol ending in this time slot is given by Here, n=0, ..., number of repetitions-1, S represents the starting symbol of the configured uplink data channel, and L represents the symbol length of the configured uplink data channel. K s indicates the time slot in which PUSCH transmission starts and Indicates the number of symbols per time slot.

[0397] -The terminal determines an invalid symbol of PUSCH repetition transmission type B. The symbol configured for the downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated is determined to be an invalid symbol of PUSCH repetition transmission type B. In addition, the invalid symbol can be configured in a high-level parameter (e.g., InvalidSymbolPattern). The high-level parameter (e.g., InvalidSymbolPattern) provides a symbol level bitmap spanning one time slot or two time slots so that the invalid symbol can be configured. 1 in the bitmap indicates an invalid symbol. In addition, the period and pattern of the bitmap can be configured by a high-level parameter (e.g., periodicityAndPattern). If a high-level parameter (e.g., InvalidSymbolPattern) is configured and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the terminal applies the invalid symbol mode, and if the parameter indicates 0, the terminal does not apply the invalid symbol mode. If a higher layer parameter (e.g., InvalidSymbolPattern) is configured and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameters are not configured, the terminal applies the invalid symbol mode.

[0398] After determining the invalid symbols, for each nominal repetition, the terminal may regard symbols other than the invalid symbols as valid symbols. If each nominal repetition includes one or more valid symbols, the nominal repetition may include one or more actual repetitions. Here, each actual repetition includes a continuous set of valid symbols that can be used for PUSCH repetition transmission type B in a time slot.

[0399] Fig.17 is a diagram showing an example of PUSCH repetition transmission type B in a wireless communication system according to an embodiment of the present disclosure. The terminal may configure the start symbol S of the uplink data channel to 0 and the length L of the uplink data channel to 14, and may configure the number of repetition transmissions to 16. In this case, a nominal repetition 1701 is indicated in 16 consecutive time slots. Thereafter, the terminal may determine the symbols configured as downlink symbols in each nominal repetition 1701 as invalid symbols. In addition, the terminal determines the symbols configured as 1 in the invalid symbol pattern 1702 as invalid symbols. If the valid symbols that are not invalid symbols in each nominal repetition consist of one or more consecutive symbols in one time slot, they are configured as actual repetitions 1703 and are transmitted.

[0400] In addition, for PUSCH repetition transmission, NR Release 16 may define the following additional methods for UL grant-based PUSCH transmission across slot boundaries and configured grant-based PUSCH transmission:

[0401] - Method 1 (mini-slot level repetition): Two or more PUSCH repetition transmissions are scheduled within a slot or across the boundary of consecutive slots by one UL grant. In addition, for method 1, the time domain resource allocation information in the DCI indicates the resources of the first repetition transmission. In addition, the time domain resource information of the first repetition transmission and the time domain resource information of the remaining repetition transmissions can be determined based on the uplink or downlink direction determined for each symbol in each slot. Each repetition transmission occupies consecutive symbols.

[0402] -Method 2 (multi-segment transmission): Two or more PUSCH repetition transmissions are scheduled in consecutive time slots by one UL grant. In this case, one transmission is specified for each time slot, and the starting point or repetition length may be different for each transmission. In addition, in method two, the time domain resource allocation information in the DCI indicates the starting point and repetition length of all repetition transmissions. In addition, when repetition transmission is performed in a single time slot by method 2, if there are multiple bundles of consecutive uplink symbols in the time slot, each repetition transmission is performed for each bundle of uplink symbols. If there is only one bundle of consecutive uplink symbols in the time slot, one PUSCH repetition transmission is performed according to the method of NR version 15.

[0403] - Method 3: Two or more PUSCH repetitive transmissions are scheduled in consecutive time slots by two or more UL grants. In this case, one transmission is assigned to each time slot, and the nth UL grant can be received before the PUSCH transmission scheduled by the (n-1)th UL grant ends.

[0404] -Method 4: One or more PUSCH repetition transmissions in a single time slot, or two or more PUSCH repetition transmissions across the boundaries of consecutive time slots, can be supported by one UL grant or one configured grant. The number of repetitions indicated by the base station to the terminal is only a nominal value, and the number of PUSCH repetition transmissions actually performed by the terminal may be greater than the nominal number of repetitions. The time domain resource allocation information in the DCI or the configured grant indicates the resources of the first repetition transmission indicated by the base station. The time domain resource information of the remaining repetition transmissions can be determined by at least referring to the resource information of the first repetition transmission and the uplink or downlink direction of the symbol. If the time domain resource information of the repetition transmission indicated by the base station crosses the time slot boundary or includes an uplink / downlink switching point, the corresponding repetition transmission may be divided into multiple repetition transmissions. In this case, one repetition transmission may be included for each uplink period in a time slot.

[0405] [PUSCH: frequency hopping process]

[0406] In the following, we specifically describe the frequency hopping of the uplink data channel (Physical Uplink Shared Channel (PUSCH)) in the 5G system.

[0407] In 5G, two methods are supported for each PUSCH repetition transmission type as a frequency hopping method for an uplink data channel. First, PUSCH repetition transmission type A supports intra-slot frequency hopping and inter-slot frequency hopping, and PUSCH repetition transmission type B supports inter-repetition frequency hopping and inter-slot frequency hopping.

[0408] The intra-slot frequency hopping method supported in PUSCH repetition transmission type A is a method in which a terminal changes the allocated frequency domain resources by a configured frequency offset and transmits them in two hops within one slot. In the intra-slot frequency hopping, the starting RB of each hop can be expressed by Equation 5.

[0409] [Equation 5]

[0410]

[0411] In Equation 5, i=0 and i=1 represent the first hop and the second hop, respectively, and RB start Indicates the starting RB in the UL BWP and is calculated according to the frequency resource allocation method. RB offset represents the frequency offset between two hops through upper layer parameters. The number of symbols in the first hop can be expressed as And the number of symbols in the second hop can be expressed as is the length of a PUSCH transmission in one slot, expressed as the number of OFDM symbols.

[0412] Next, the inter-slot frequency hopping method supported by PUSCH repetition transmission types A and B is a method in which the terminal changes the allocated frequency domain resources by the configured frequency offset for each slot and transmits them. In inter-slot frequency hopping, The starting RB during a time slot can be expressed by Equation 6.

[0413] [Equation 6]

[0414]

[0415] In equation 6, Indicates the current time slot number in multi-slot PUSCH transmission, RB start Indicates the starting RB in the UL BWP and is calculated according to the frequency resource allocation method. ffset Indicates the frequency offset between two hops through upper layer parameters.

[0416] Next, the inter-repetition frequency hopping method supported in PUSCH repetition transmission type B is to transmit the allocated frequency domain resources by shifting the allocated frequency domain resources for one or more actual repetitions within each nominal repetition by the configured frequency offset. start (n), which is the index of the starting RB in the frequency domain for one or more actual repetitions within the nth nominal repetition, can follow the following Equation 7.

[0417] [Equation 7]

[0418]

[0419] In Equation 7, n is the index of the nominal repetition, and RB offset Indicates the RB offset between two hops through upper layer parameters.

[0420] [UE capability report related]

[0421] In LTE and NR, the terminal can perform a process of reporting the capabilities supported by the terminal to the serving base station while connected to the serving base station. In the following explanation, this is called UE capability reporting.

[0422] The base station may send a UE capability query message requesting a capability report to a terminal in a connected state. The message may include a UE capability request for each radio access technology (RAT) type of the base station. The RAT type specific request may include information about a combination of supported frequency bands, etc. In addition, in the case of a UE capability query message, multiple UE capabilities for each RAT type may be requested by an RRC message container sent by the base station, or the base station may include a UE capability query message containing a UE capability request for each RAT type multiple times and send it to the terminal. That is, the UE capability query may be repeated multiple times in one message, and the terminal may configure the corresponding UE capability information message and report it multiple times. In the next generation mobile communication system, a UE capability request may be made for a multi-RAT dual connection (MR-DC) including NR, LTE and E-UTRA-NR dual connection (EN-DC). In addition, the UE capability query message is usually initially sent after the terminal is connected to the base station, but may be requested under any conditions when the base station needs it.

[0423] In the above steps, the terminal that receives the UE capability report request from the base station configures the UE capability according to the RAT type and frequency band information requested from the base station. The following is an overview of how the terminal configures the UE capability in the NR system.

[0424] 1. If the terminal receives a list of LTE and / or NR bands from the base station as a UE capability request, the terminal configures the band combination (BC) of EN-DC and NR standalone (SA). That is, the terminal configures the candidate list of BC of EN-DC and NRSA as FreqBandList based on the band requested from the base station. In addition, the priority of the band is given in the order listed in FreqBandList.

[0425] 2. If the base station requests UE capability reporting by configuring the "eutra-nr-only" flag or the "eutra" flag, the terminal completely removes the NR SABC from the candidate list of the configured BC. This operation can only occur when the LTE base station (eNB) requests the "eutra" capability.

[0426] 3. After that, the terminal removes the fallback BC from the candidate list of BCs configured in the above steps. Here, the fallback BC refers to the BC that can be obtained by removing at least one frequency band corresponding to the SCell from any BC, and can be omitted because the BC before removing the frequency band corresponding to at least one SCell can already cover the fallback BC. This step is also applied to MR-DC, that is, to the LTE band. The BC remaining after this step is the final "candidate BC list".

[0427] 4. The terminal selects the BC to be reported by selecting the BC that matches the requested RAT type from the final "candidate BC list" above. In this step, the terminal configures the supported BandCombinationList (supportedBandCombinationList) in the determined order. That is, the terminal configures the BC to be reported and the UE capabilities in the order of the predetermined rat type (rat-Type) (nr->eutra-nr->eutra). In addition, the terminal configures featureSetCombination for the configured supportedBandCombinationList, and configures a list of "candidate feature set combinations" according to the candidate BC list from which the list of fallback BCs (which includes capabilities of the same or lower level) is removed. The above "candidate feature set combinations" include feature set combinations of both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations of the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0428] 5. In addition, if the requested rat type is eutra-nr and is influential, featureSetCombinations are included in two containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, feature sets for NR are only included in UE-NR-Capabilities.

[0429] After configuring the UE capabilities, the terminal sends a UE capability information message containing the UE capabilities to the base station. Based on the UE capabilities received from the terminal, the base station then performs appropriate scheduling and transmission / reception management for the terminal.

[0430] [CA / DC related]

[0431] Fig.18 is a diagram showing a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity case according to an embodiment of the present disclosure.

[0432] refer to Fig.18 The wireless protocol of the next-generation mobile communication system consists of the NR Service Data Adaptation Protocol (SDAP) S25 and S70 in the terminal and NR base station, the NR Packet Data Convergence Protocol (PDCP) S30 and S65, the NR Radio Link Control (RLC) S35 and S60, and the NR Medium Access Control (MAC) S40 and S55.

[0433] Key features of NR SDAP S25 and S70 may include some of the following:

[0434] -Transmission of user plane data

[0435] - Mapping between QoS flows and DRBs for both DL and UL

[0436] - Marking of QoS Flow ID in both DL and UL packets

[0437] - Functionality to map Reflective QoS flows to DRB mapping for UL SDAP PDUs.

[0438] For the above-mentioned SDAP layer device, the terminal can be configured through an RRC message for each PDCP layer device, through a bearer or through a logical channel whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and if the SDAP header is configured, the terminal can indicate the NAS QoS reflection configuration 1-bit indicator (NAS reflection QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflection QoS) of the SDAP header to update or reconfigure the mapping information of the QoS flow and data bearer of the uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority, scheduling information, etc. to support the desired service.

[0439] Main functions of NR PDCP S30 and S65 may include some of the following functions.

[0440] -Header compression and decompression (ROHC only)

[0441] -Transmission of user data functions

[0442] - In-sequence delivery of upper layer PDUs

[0443] - Out-of-order delivery of upper layer PDUs

[0444] - Reordering of received PDCP PDUs

[0445] - Duplicate detection of lower layer SDU

[0446] -Retransmission of PPDCP SDU

[0447] -Encryption and decryption functions

[0448] - Timer-based SDU discard in uplink

[0449] The reordering function of the above-mentioned NR PDCP device refers to a function of reordering the PDCP PDUs received from the lower layer in sequence based on the PDCP sequence number (SN), and may include a function of sending data to the upper layer in the reordered order. Alternatively, the reordering function of the NR PDCP device may include a function of directly sending data without considering the order, a function of recording the lost PDCP PDU by reordering the order, a function of reporting the status of the lost PDCP PDU to the transmitting side, and a function of requesting retransmission of the lost PDCP PDU.

[0450] The main functions of NR RLC S35 and S60 may include some of the following functions.

[0451] -Transmission of upper layer PDU

[0452] - In-sequence delivery of upper layer PDUs

[0453] - Out-of-order delivery of upper layer PDUs

[0454] - Error correction via ARQ

[0455] - Concatenation, segmentation and reassembly of RLC SDU

[0456] - Re-segmentation of RLC data PDUs

[0457] - Reordering of RLC data PDUs

[0458] - Duplicate detection function

[0459] -Protocol error detection

[0460] -RLC SDU discard function

[0461] -RLC reconstruction function

[0462] In the above, the in-sequence delivery function of the NR RLC device refers to a function of sequentially delivering the RLC SDU received from the lower layer to the upper layer. The in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering a single RLC SDU that was originally divided into a plurality of RLC SDUs and received, a function of rearranging the received RLC PDU based on the RLC sequence number (SN) or the PDCP sequence number (SN), a function of recording the lost RLC PDU by rearranging the order, a function of reporting the state of the lost RLC PDU to the transmitting side, and a function of requesting retransmission of the lost RLC PDU. The in-sequence delivery function of the NR RLC device may include a function of sequentially delivering only the RLC SDUs until the lost RLC SDU to the upper layer if there is a lost RLC SDU, or may include a function of sequentially delivering all RLC SDUs received before the timer is started to the upper layer if a predetermined timer has expired even if there is a lost RLC SDU. Alternatively, the in-sequence delivery function of the NR RLC device may include a function of sequentially delivering all RLC SDUs received so far to the upper layer if a predetermined timer has expired even if there is a lost RLC SDU. In addition, the RLC PDUs may be processed and delivered to the PDCP device in the order in which they are received (in the order of arrival, regardless of the order of sequence numbers) regardless of the order (out-of-order delivery), or in the case of segmentation, segments stored in a buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and delivered to the PDCP device. The above-mentioned NR RLC layer may not include a cascading function, and the function may be performed in the NR MAC layer or replaced by a multiplexing function of the NR MAC layer.

[0463] The out-of-order delivery function of the NRRLC device mentioned above refers to a function of directly delivering the RLC SDU received from the lower layer to the upper layer regardless of the order, and may include a function of reassembling and delivering multiple RLC SDUs when one RLC SDU is originally received as multiple RLC SDUs, and may include a function of storing and arranging the RLC SN or PDCP SN of the received RLC PDU to record any lost RLC PDU.

[0464] NR MAC S40 and S55 can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0465] - Mapping between logical channels and transport channels

[0466] -Multiplexing / demultiplexing of MAC SDU

[0467] -Scheduling information reporting function

[0468] -HARQ function (error correction through HARQ)

[0469] - Priority handling between logical channels of a UE

[0470] - Priority handling between UEs through dynamic scheduling

[0471] -MBMS service identification function

[0472] -Transmission format selection function

[0473] - Fill function

[0474] The NR PHY layers S45 and S50 may perform the following operations: channel-encode and modulate the upper layer data, convert it into OFDM symbols, and transmit it through a wireless channel, or demodulate and channel-decode the OFDM symbols received through the wireless channel and transmit it to a higher layer.

[0475] The above-mentioned wireless protocol structure may have various detailed structures that change depending on the carrier (or cell) operation method. For example, if the base station sends data to the terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure with a single structure for each layer, such as S00. On the other hand, if the base station sends data to the terminal based on carrier aggregation (CA) using multiple carriers in a single TRP, the base station and the terminal use a protocol structure with a single structure up to RLC but multiplexing the PHY layer through the MAC layer, such as S10. As another example, if the base station sends data to the terminal based on dual connectivity (DC) using multiple carriers in multiple TRPs, the base station and the terminal use a protocol structure with a single structure up to RLC but multiplexing the PHY layer through the MAC layer, such as S20.

[0476] [SRS related]

[0477] Next, a method for estimating an uplink channel using a sounding reference signal (SRS) transmitted by a terminal is described. The base station may configure at least one SRS configuration for each uplink BWP to send configuration information for SRS transmission to the terminal, and may also configure at least one SRS resource set for each SRS configuration. For example, the base station and the terminal may exchange the following upper layer signaling information to send information about the SRS resource set.

[0478] -srs-ResourceSetId: SRS resource set index

[0479] -srs-ResourceIdList: A collection of SRS resource indexes referenced in the SRS resource set

[0480] -resourceType: This is the time domain transmission configuration of the SRS resource referenced in the SRS resource set, and can be configured as one of "periodic", "semi-persistent", and "aperiodic". If configured as "periodic" or "semi-persistent", the associated CSI-RS information can be provided depending on the usage of the SRS resource set. If configured as "aperiodic", the aperiodic SRS resource trigger list and time slot offset information can be provided, and the associated CSI-RS information can be provided depending on the usage of the SRS resource set.

[0481] - Usage: This is a configuration of the usage of the SRS resource referenced in the SRS resource set, and can be configured as one of "beam management", "codebook", "nonCodebook", and "antenna switching".

[0482] -alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter configuration for adjusting the transmit power of SRS resources referenced in the SRS resource set.

[0483] The terminal may understand that the SRS resources included in the set of SRS resource indexes referenced in the SRS resource set comply with the information configured in the SRS resource set.

[0484] In addition, the base station and the terminal may send and receive upper layer signaling information to transmit separate configuration information for SRS resources. For example, the separate configuration information for SRS resources may include time-frequency domain mapping information within a time slot of the SRS resources, which may include information about frequency hopping within a time slot or between time slots of the SRS resources. In addition, the separate configuration information for SRS resources may include a time domain transmission configuration for the SRS resources, which may be configured as one of "periodic", "semi-persistent" and "non-periodic". This may be limited to having the same time domain transmission configuration as the SRS resource set including the SRS resources. If the time domain transmission configuration of the SRS resource is configured as "periodic" or "semi-persistent", the SRS resource transmission period and time slot offset (e.g., periodicityAndOffset) may be additionally included in the time domain transmission configuration.

[0485] The base station may activate, deactivate or trigger SRS transmission to the terminal through high-layer signaling or L1 signaling (e.g., DCI) including RRC signaling or MAC CE signaling. For example, the base station may activate or deactivate periodic SRS transmission to the terminal through high-layer signaling. The base station may instruct the terminal to activate an SRS resource set in which resourceType is configured as periodic through high-layer signaling, and the terminal may send SRS resources referenced in the activated SRS resource set. The time-frequency domain resource mapping within the time slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource, and the time slot mapping including the transmission period and time slot offset follows the periodicityAndOffset configured in the SRS resource. In addition, the spatial domain transmit filter applied to the transmitted SRS resource may refer to the spatial relationship information configured in the SRS resource, or may refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The terminal may send SRS resources within the activated uplink BWP for the periodic SRS resource activated by upper layer signaling.

[0486] For example, the base station may activate or deactivate semi-persistent SRS transmission to the terminal through upper layer signaling. The base station may indicate the activation of the SRS resource set through MAC CE signaling, and the terminal may send the SRS resource referenced in the activated SRS resource set. The SRS resource set activated by MAC CE signaling may be limited to the SRS resource set whose resourceType is configured as semi-persistent. The time-frequency domain resource mapping within the time slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource, and the time slot mapping including the transmission period and time slot offset follows the periodicityAndOffset configured in the SRS resource. In addition, the spatial domain transmit filter applied to the transmitted SRS resource may refer to the spatial relationship information configured in the SRS resource, or may refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. If the spatial relationship information is configured in the SRS resource, the spatial domain transmit filter may be determined by referring to but not following the configuration information for the spatial relationship information transmitted by the MAC CE signaling sent by activating the semi-persistent SRS. The terminal may transmit the SRS resource within the activated uplink BWP for the semi-persistent SRS resource activated by the upper layer signaling.

[0487] For example, the base station may trigger aperiodic SRS transmission to the terminal through DCI. The base station may indicate one of the aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) through the SRS request field of the DCI. The terminal may understand that the SRS resource set triggered by the aperiodic SRS resource indicated by the DCI in the aperiodic SRS resource trigger list included in the configuration information of the SRS resource set is triggered. The terminal may send the SRS resource referenced in the triggered SRS resource set. The time-frequency domain resource mapping within the time slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource. In addition, the time slot mapping of the transmitted SRS resource may be determined by the time slot offset between the PDCCH including the DCI and the SRS resource, and this may refer to the value included in the time slot offset set configured in the SRS resource set. Specifically, the time slot offset between the PDCCH including the DCI and the SRS resource may apply the value indicated in the time domain resource allocation field of the DCI in the offset value included in the time slot offset configured in the SRS resource set. In addition, the spatial domain transmit filter applied to the transmitted SRS resource may refer to the spatial relationship information configured in the SRS resource, or may refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The terminal may transmit the SRS resource within the uplink BWP for activation of the aperiodic SRS resource triggered by the DCI.

[0488] When the base station triggers aperiodic SRS transmission to the terminal through DCI, a minimum time interval may be required between the PDCCH including the DCI that triggers the aperiodic SRS transmission and the SRS to be transmitted, so that the terminal can transmit the SRS by applying the configuration information of the SRS resource. The time interval for the SRS transmission of the terminal can be defined as the number of symbols between the last symbol of the PDCCH including the DCI that triggers the aperiodic SRS transmission and the first symbol to which the SRS resource to be transmitted is first mapped in the SRS resource to be transmitted. The minimum time interval can be determined with reference to the PUSCH preparation process time required for the terminal to prepare for PUSCH transmission. In addition, the minimum time interval may have different values ​​depending on the purpose of the SRS resource set including the SRS resource to be transmitted. For example, the minimum time interval can be determined as N2 symbols defined by referring to the PUSCH preparation process time of the terminal according to the terminal's capabilities and considering the terminal processing capability. In addition, considering the purpose of the SRS resource set including the SRS resource to be transmitted, if the purpose of the SRS resource set is configured as "codebook" or "antennaSwitching", the minimum time interval can be configured as N2 symbols, and if the purpose of the SRS resource set is configured as "nonCodebook" or "beamManagement", the minimum time interval can be configured as N2+14 symbols. If the time interval for non-periodic SRS transmission is greater than or equal to the minimum time interval, the terminal transmits the non-periodic SRS, and if the time interval for non-periodic SRS transmission is less than the minimum time interval, the DCI triggering the non-periodic SRS can be ignored.

[0489] [Table 29]

[0490]

[0491]

[0492] The following SRS parameters can be semi-statically configured by the upper layer parameter SRS-Resource.

[0493] -srs-ResourceId identifies the SRS resource configuration identifier.

[0494] - The number of SRS ports can be configured by the upper layer parameter nrofSRS-Ports and can be configured to 1, 2, or 4. If nrofSRS-Ports is not configured, nrofSRS-Ports is 1.

[0495] - The time domain behavior of SRS resource placement as indicated by the upper layer parameter resourceType can be one of "periodic", "semi-persistent" or "aperiodic" SRS transmission.

[0496] -When the SRS resource type is periodic or semi-persistent, the slot level period and slot level offset are determined by the upper layer parameters periodicityAndOffset-p or periodicityAndOffset-sp. The terminal does not expect to configure SRS resources with different slot level periods in the same SRS resource set SRS-ResourceSet. When the upper layer parameter resourceType for SRS-ResourceSet is configured as "non-periodic", the slot level offset is defined by the upper layer parameter slotOffset.

[0497] - The number of OFDM symbols in the SRS resource, the starting OFDM symbol in the slot and the repetition factor R are configured by the upper layer parameter resourceMapping. If R is not configured, R is equal to the number of OFDM symbols in the SRS resource.

[0498] - The SRS bandwidth B_SRS and C_SRS are configured by the upper layer parameter freqHopping. If it is not configured, B_SRS becomes 0.

[0499] - The frequency hopping bandwidth b_hop is configured by the upper layer parameter freqHopping. If it is not configured, b_hop becomes 0.

[0500] - The frequency domain position and configurable shift are configured by the upper layer parameters freqDomainPosition and freqDomainShift respectively. If freqDomainPosition is not configured, its value is 0.

[0501] - The cyclic shift is configured by the upper layer parameters cyclicShift-n2, cyclicShift-n4 or cyclicShift-n8 for transmit comb values ​​2, 4 and 8 respectively.

[0502] -The transmission comb value is configured by the upper layer parameter transmissionComb.

[0503] - The transmit comb offset is configured by the upper layer parameters combOffset-n2, combOffset-n4 or combOffset-n8 for transmit comb values ​​2, 4 and 8 respectively.

[0504] -SRS sequence ID is configured by the upper layer parameter sequenceID.

[0505] -N within the last 6 symbols of the slot s= 1, 2 or 4 adjacent symbols can be configured as the SRS resource of the terminal using the upper layer parameter resourceMapping in SRS-Resource. At this time, each symbol of the resource is mapped to all SRS antenna ports.

[0506] - Through the upper layer parameter resourceMapping-r16 in the SRS resource, the base station can configure up to N in all symbol positions in the time slot s =1, 2 or 4 adjacent symbols as the SRS time resource of the terminal. In addition, repetitionFactor-r16 can have one of the values ​​of R=1, 2 or 4, and R can be N s The factor (divisor) of .

[0507] - Through the upper layer parameter resourceMapping-r17 in the SRS resource, the base station can configure up to N in all symbol positions in the time slot s =1, 2, 4, 8, 10, 12, 14 adjacent symbols as the SRS time resource of the terminal. In addition, repetitionFactor-r17 can have one of the values ​​1, 2, 4, 5, 6, 7, 8, 10, 12, 14, and R can be N s factor.

[0508] The spatialRelationInfo configuration information of the above [Table 29] refers to one reference signal and applies the beam information of the reference signal to the beam used for SRS transmission. For example, the configuration of spatialRelationInfo may include information such as the following [Table 30].

[0509] [Table 30]

[0510]

[0511] Referring to the above spatialRelationInfo configuration, the index of the reference signal to be referenced in order to use the beam information of a specific reference signal can be configured, that is, the SS / PBCH block index, the CSI-RS index, or the SRS index. The upper layer signaling referenceSignal is configuration information indicating which reference signal beam information will be referenced for the corresponding SRS transmission, and respectively, ssb-Index refers to the index of the SS / PBCH block, csi-RS-Index refers to the index of the CSI-RS, and srs refers to the index of the SRS. If the value of the upper layer signaling referenceSignal is configured as "ssb-Index", the terminal can apply the receiving beam used when receiving the SS / PBCH block corresponding to the ssb-Index as the transmitting beam for the corresponding SRS transmission. If the value of the upper layer signaling referenceSignal is configured as "csi-RS-Index", the terminal can apply the receiving beam used when receiving the CSI-RS corresponding to the csi-RS-Index as the transmitting beam for the corresponding SRS transmission. If the value of the upper layer signaling referenceSignal is configured as "srs", the terminal can apply the transmission beam used when transmitting the SRS corresponding to the srs as the transmission beam for the corresponding SRS transmission.

[0512] It has been explained that the TCI state is used for beam indication of the downlink channel (indication of receiving spatial filter value / terminal type), and SpatialRelationInfo is used for beam indication of the uplink channel (indication of sending spatial filter value / terminal type). However, it should be noted that this does not mean limitation according to the types of uplink and downlink, and mutual expansion is possible in the future. For example, the traditional downlink TCI state (DL TCI state) can be extended to the uplink TCI state (UL TCI state) by adding an uplink channel or signal to the type of target RS that can refer to the TCI state, or adding an uplink channel or signal to the type of referenceSignal (reference RS) included in the TCI state or QCL-Info. For example, the base station can use the TCI state instead of spatialrelationinfo to notify the terminal of the information of the transmission beam of the SRS by configuring the upper layer signaling parameters such as srs-TCIState-r17 in [Table 29] above. There are various extension methods such as DL-UL joint TCI state, but not all methods are described to avoid blurring the subject of the explanation.

[0513] The SRS may be composed of a constant amplitude zero autocorrelation (CAZAC) sequence. In addition, the CAZAC sequence constituting each SRS transmitted from multiple terminals has a different cyclic shift value. In addition, the CAZAC sequence generated by the cyclic shift in a CAZAC sequence has a characteristic of having a zero correlation value with a sequence having a different cyclic shift value from itself. By utilizing this feature, the SRSs simultaneously allocated to the same frequency domain can be distinguished according to the CAZAC sequence cyclic shift value configured by the base station for each SRS.

[0514] The SRS of multiple terminals can be distinguished by frequency position and cyclic shift value. The frequency position can be distinguished by SRS subband unit allocation or comb. 5G or NR systems can support Comb 2 (Comb2), Comb 4 (Comb4) and Comb 8 (Comb8). In the case of Comb2, one SRS can be allocated only to even-numbered subcarriers or odd-numbered subcarriers within the SRS subband. In this case, each of the even-numbered subcarriers and the odd-numbered subcarriers can constitute a comb.

[0515] Each terminal may be allocated an SRS subband based on a tree structure. And the terminal may perform hopping to the SRS allocated to each subband at each SRS transmission time. Therefore, all transmit antennas of the terminal may use the entire uplink data transmission bandwidth to transmit the SRS.

[0516] Fig.19 is a diagram showing a structure in which an SRS is allocated for each subband.

[0517] refer to Fig.19 , shows an example in which, when a data transmission band corresponding to 40 RB in frequency is provided, an SRS is allocated to each terminal according to a tree structure configured by a base station.

[0518] exist Fig.19 , when the level index of the tree structure is b, the top level (b=0) of the tree structure may consist of one SRS subband with a 40RB bandwidth. At the second level (b=1), two SRS subbands with a 20RB bandwidth may be generated from the SRS subband of level b=0. Therefore, two SRS subbands may exist in the entire data transmission band of the second level (b=1). At the third level (b=2), five 4RB SRS subbands are generated from a 20RB SRS subband immediately above the previous level (b=1), and a structure may be formed in which ten 4RB SRS subbands exist within one level.

[0519] Depending on the configuration of the base station, the configuration of the tree structure may have various levels, SRS subband sizes, and the number of SRS subbands per level. Here, the number of SRS subbands at level b generated from one SRS subband at a higher level may be defined as N b , and these N b The index of the SRS subband can be defined as n b ={0,…,N b -1}. When the subbands per level are changed in this way, a terminal can be assigned to each subband per level, such as Fig.19 For example, terminal 1 19-00 may be allocated to the first SRS subband n of two SRS subbands with a bandwidth of 20 RB at level b=1. 1 =0, and terminal 2 19-01 and terminal 3 19-02 can be respectively allocated to the first SRS subband n under the second 20RB SRS subband 2 = 0 and the third SRS subband n 2 = 2. Through these procedures, the terminal can simultaneously transmit the SRS through multiple component carriers (CCs), and can simultaneously transmit the SRS through multiple SRS subbands within one CC.

[0520] Specifically, for the above-mentioned SRS subband configuration, NR supports the SRS bandwidth configuration shown in the following [Table 31].

[0521] [Table 31]

[0522]

[0523]

[0524] In addition, NR supports SRS frequency hopping based on the values ​​in Table 31 above, and the detailed process follows Table 32 below.

[0525] [Table 32]

[0526]

[0527]

[0528] As mentioned above, 5G or NR terminals support SU-MIMO (single user) technology and have up to 4 transmit antennas. In addition, NR terminals can simultaneously send SRS to multiple CCs or multiple SRS subbands within one CC. Unlike LTE systems, 5G or NR systems support various parameter sets, can configure SRS transmission symbols in a variety of ways, and can also allow repeated transmission of SRS transmission through repetition factors.

[0529] Therefore, considering this, it is necessary to count the SRS transmission. Counting the SRS transmission can be used in various ways. For example, counting the SRS transmission can be used to support antenna switching according to the SRS transmission. Specifically, it can be determined by counting the SRS transmission to determine which SRS corresponding to which antenna is sent in which frequency band at which SRS transmission time.

[0530] The terminal does not expect the SRS resources within the same SRS resource set to be configured with different time domain operations. In addition, the terminal does not expect the SRS resource sets associated with the SRS resources to be configured with different time domain operations. The SRS request field included in DCI formats 0_1, 1_1, 0_2 (when the SRS request field exists) and 1_2 (when the SRS request field exists) indicates the triggered SRS resource set, as shown in [Table 33] below. If the upper layer parameter srs-TPC-PDCCH-Group for the terminal is configured as "typeB", the 2-bit SRS request field included in DCI format 2_3 indicates the triggered SRS resource set. Alternatively, if the upper layer parameter srs-TPC-PDCCH-Group for the terminal is configured as "typeA", the 2-bit SRS request field included in DCI format 2_3 indicates SRS transmission for a set of supporting cells configured by the upper layer.

[0531] [Table 33]

[0532]

[0533]

[0534] For PUCCH and SRS scheduled on the same carrier, when semi-persistent SRS and periodic SRS are configured to the same symbol as PUCCH including only CSI report, only L1-RSRP report or only L1-SINR report, the terminal does not send SRS. When semi-persistent SRS or periodic SRS is configured to the same symbol as PUCCH including HARQ-ACK, link recovery request and / or SR, or aperiodic SRS is triggered to be sent in the same symbol as PUCCH including the above information, the terminal does not send SRS. If SRS cannot be sent when overlapping with PUCCH, only SRS symbols overlapping with PUCCH are discarded. When aperiodic SRS is triggered to overlap with PUCCH including only semi-persistent / periodic CSI report, or only semi-persistent / periodic L1-RSRP report, or only L1-SINR report, PUCCH is not sent.

[0535] For band-band combinations that do not allow simultaneous transmission of SRS and PUCCH / PUSCH for intra-band or inter-band carrier aggregation, the terminal does not expect that PUSCH / UL DM-RS / UL PT-RS / PUCCH formats will be configured in the same symbol from a carrier different from the carrier on which SRS is configured.

[0536] For band-band combinations that do not allow simultaneous transmission of SRS and PRACH for intra-band or inter-band carrier aggregation, simultaneous transmission of SRS from one carrier and PRACH from another carrier is not permitted.

[0537] When an SRS resource whose upper layer parameter resourceType is configured as "non-periodic" is triggered on an OFDM symbol for periodic / semi-persistent SRS transmission, the terminal transmits non-periodic SRS resources, the periodic / semi-persistent SRS symbols overlapping with the symbol are discarded, and non-overlapping periodic / semi-persistent SRS symbols are transmitted. When an SRS resource whose upper layer parameter resourceType is configured as "semi-persistent" is triggered on an OFDM symbol for periodic SRS transmission, the terminal transmits semi-persistent SRS resources, the periodic SRS symbols in the overlapping symbols are discarded, and non-overlapping periodic SRS symbols are transmitted.

[0538] When the terminal has the upper layer parameter usage in SRS-ResourceSet configured as "antennaSwitcing" and a guard period of Y symbols is configured, the terminal follows the same priority rules as defined above, as if SRS is configured during the guard period.

[0539] When the upper layer parameter spatialRelationInfo of a semi-persistent or aperiodic SRS resource is activated or updated with a MAC CE for a CC / bandwidth part indicated by a set of upper layer parameters applicableCellList, spatialRelationInfo is applied to the semi-persistent or aperiodic SRS resource with the same SRS resource ID for all bandwidth parts within the indicated CC.

[0540] When the upper layer parameter enableDefaultBeamPlForSRS is configured to "enable", in addition to the associated CSI-RS configuration, the upper layer parameter usage of the SRS resource is configured as "beamManagement" or configured as "nonCodebook", the upper layer parameter spatialRelationInfo of the SRS resource is not configured in FR2, and the upper layer parameter pathlossReferenceRS for the terminal is not configured, the terminal sends the target SRS resource according to the following configuration.

[0541] - The terminal transmits the target SRS resources using the same spatial domain transmit filters as those received by the CORESET with the lowest controlResoureSetID in the activated DL bandwidth part within the CC.

[0542] - If the terminal has not configured any CORESET in the CC, it transmits the target SRS resources using the same spatial domain transmit filter that received the activated TCI state with the lowest ID applicable to the PDSCH in the activated DL bandwidth part of the CC.

[0543] Table 34 indicates UE capabilities including resource-related information of an uplink reference signal used for positioning.

[0544] [Table 34]

[0545]

[0546] A terminal reporting the UE capabilities of Table 34 above (hereinafter denoted as FG 13-8) can transmit an uplink reference signal at any OFDM symbol position in any slot when transmitting the uplink reference signal.

[0547] Table 35 indicates UE capabilities including information about the location of a transmission symbol within a slot of an uplink reference signal in an unlicensed band.

[0548] [Table 35]

[0549]

[0550] A terminal reporting the UE capabilities of Table 35 above (hereinafter referred to as FG 10-11) may send an uplink reference signal at any OFDM symbol position in any slot in both the unlicensed band and the licensed band when sending an uplink reference signal.

[0551] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The contents of the present disclosure can be applied to FDD and TDD systems. In the following disclosure, upper layer signaling (or high layer signaling) refers to a signal transmission method in which a base station uses a downlink data channel of a physical layer to send a signal to a terminal, or a terminal uses an uplink data channel of a physical layer to send a signal to a base station, and may also be referred to as RRC signaling, PDCP signaling, or a media access control (MAC) control element (MAC control element, MAC CE).

[0552] In the following disclosure, when determining whether to apply cooperative communication, the terminal may use various methods, such as having a specific format of the PDCCH for allocating the PDSCH applied for cooperative communication, or including a specific indicator indicating whether cooperative communication is applied, or having scrambled a specific RNTI for the PDCCH for allocating the PDSCH applied for cooperative communication, or assuming that cooperative communication is applied in a specific segment indicated by a higher layer. For the convenience of the following description, the case where the terminal receives the PDSCH applied for cooperative communication based on conditions similar to those described above will be referred to as the NC-JT case.

[0553] In the following disclosure, the priority between A and B may be determined in various ways, such as selecting a higher priority and executing an action corresponding thereto according to a predetermined priority rule, or omitting or discarding an action for a lower priority.

[0554] In the following disclosure, the above-mentioned examples are described through multiple embodiments, but they are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0555] In the following description of the present disclosure, for convenience, cells, transmission points, panels, beams, and / or transmission directions that can be distinguished by upper layer / L1 parameters (such as TCI states or spatial relationship information) or indicators (such as cell IDs, TRP IDs, and panel IDs) may be uniformly described as transmit / receive points (TRPs), beams, or TCI states. Therefore, in practical applications, TRPs, beams, or TCI states may be appropriately replaced with one of the above terms.

[0556] In the following disclosure, when determining whether to apply cooperative communication, the terminal may use various methods, such as having a specific format of the PDCCH for allocating the PDSCH applied for cooperative communication, or including a specific indicator indicating whether cooperative communication is applied, or having scrambled a specific RNTI for the PDCCH for allocating the PDSCH applied for cooperative communication, or assuming that cooperative communication is applied in a specific segment indicated by a higher layer. For the convenience of the following description, the case where the terminal receives the PDSCH applied for cooperative communication based on conditions similar to those described above will be referred to as the NC-JT case.

[0557] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Hereinafter, a base station is a subject that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Hereinafter, a 5G system will be used as an example to describe an embodiment of the present disclosure, but an embodiment of the present disclosure may be applied to other communication systems with similar technical backgrounds or channel types. For example, LTE or LTE-A mobile communications and mobile communication technologies developed after 5G may be included here. Therefore, as judged by those skilled in the art, without significantly departing from the scope of the present disclosure, embodiments of the present disclosure may be applied to other communication systems with slight modifications. The contents of the present disclosure may be applied to FDD and TDD systems.

[0558] In addition, when describing the present disclosure, if it is judged that the specific description of the relevant function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description will be omitted. In addition, the terms described below are defined in consideration of the functions in the present disclosure, and these may vary depending on the intention or habits of the user or operator. Therefore, the definition should be based on the content throughout this specification.

[0559] In describing the present disclosure below, the upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signalings.

[0560] -Master Information Block (MIB)

[0561] - System Information Block (SIB) or SIB X (X = 1, 2, ...)

[0562] -Radio Resource Control (RRC)

[0563] -Media Access Control (MAC) Control Element (CE)

[0564] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more of the following channels or signaling methods of the physical layer.

[0565] - Physical Downlink Control Channel (PDCCH)

[0566] - Downlink Control Information (DCI)

[0567] -UE-specific DCI

[0568] -Group Common DCI

[0569] - Public DCI

[0570] - Scheduling DCI (e.g., DCI for scheduling downlink or uplink data)

[0571] - Non-scheduled DCI (e.g., DCI not intended for scheduling downlink or uplink data)

[0572] -Physical Uplink Control Channel (PUCCH)

[0573] - Uplink Control Information (UCI)

[0574] In the following disclosure, the priority between A and B may be determined in various ways, such as selecting a higher priority and executing an action corresponding thereto according to a predetermined priority rule, or omitting or discarding an action for a lower priority.

[0575] The term "time slot" used below in the present disclosure is a general term that may refer to a specific time unit corresponding to a transmission time interval (TTI), and specifically may refer to a time slot used in a 5G NR system, or a time slot or subframe used in a 4G LTE system.

[0576] In the following disclosure, the above-mentioned examples are described through multiple embodiments, but they are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0577] <First embodiment: SRS resource configuration and indication method>

[0578] As an embodiment of the present disclosure, a method for configuring and indicating SRS resources is described. As described above, conventional SRS resources support up to 4 ports, and transmission can be performed for all ports for each symbol of the position of all SRS resource transmission symbols determined based on upper layer signaling. For example, if a terminal receives a 4-port SRS resource from a base station through upper layer signaling, where the number of transmission symbols is 4, the terminal can perform transmission for 4 ports for each symbol.

[0579] In the future, it is expected that advanced versions of NR will support improved specifications by considering up to 8 antenna ports of the terminal. Relevant functions are currently being discussed in NR version 18, and in future versions and even in the 6th generation mobile communication system, there is the possibility that more than 8 antenna ports can be considered on the terminal side. However, if the SRS is sent on all ports configured for each symbol sent, as currently supported, the increased number of ports will reduce the transmit power of each port when sending the SRS, which may limit the base station reception performance in poor coverage situations (such as terminals on the cell boundary). Therefore, the base station and the terminal can consider various methods of sending SRS with N antenna ports on the terminal side, where N is any number greater than 4, as described below.

[0580] [Method 1-1] Method 1 using a single SRS resource

[0581] In order to transmit an SRS with N antenna ports, the terminal may be configured with a single SRS resource from the base station. The base station may configure a single SRS resource with N antenna ports for the terminal, and at this time, the N antenna ports may be mapped to each symbol and transmitted when a single or multiple symbols of the corresponding SRS resource are transmitted. For example, if the terminal transmits an SRS resource with N antenna ports, where N s If configured as 4, all N antenna ports can be sent for each symbol.

[0582] Method 1-1 can use the definitions of various time and frequency resource allocation related parameters in [Table 29] as is, because the current standard support for 1, 2, and 4 antenna ports is based on a single SRS resource, so when the number of antenna ports of the terminal increases, Method 1-1 can be naturally expanded. However, since the terminal transmits all antenna ports in one symbol based on Method 1-1, there may be a problem of reduced transmit power for each antenna port in one symbol.

[0583] [Method 1-2] Method 2 using a single SRS resource

[0584] In order to transmit an SRS with N antenna ports, the terminal may be configured with a single SRS resource from the base station. The base station may configure a single SRS resource with N antenna ports for the terminal, and when transmitting one or more symbols configured in the corresponding SRS resource, the number of antenna ports mapped and transmitted for each symbol may be less than or equal to N, and the number of symbols required to transmit all N antenna ports may be greater than or equal to 1.

[0585] Since method 1-2 transmits some of the N antenna ports for each symbol, the transmit power of the antenna port for each symbol may be increased compared to method 1-1 in which all N antenna ports are transmitted for each symbol. However, since the definition of antenna port transmission in method 1-2 is different from the definition of the existing standard, that is, all antenna ports configured for a specific SRS resource are transmitted for each symbol, some of the definitions of various time and frequency resource allocation related parameters in the above [Table 29] may need to be changed or newly defined.

[0586] [Method 1-3] Method of using multiple SRS resources

[0587] In order to transmit an SRS with N antenna ports, the terminal may be configured with multiple SRS resources from the base station. In order to support SRS transmission corresponding to N antenna ports from the terminal, the base station may configure M (M>1) SRS resources with a value of antenna ports less than or equal to N to the terminal, and at this time, the antenna ports configured in each SRS resource with a number less than or equal to N may all be mapped and transmitted in each symbol when transmitting a single or multiple symbols of the corresponding SRS resource. For example, if the terminal is configured with two SRS resources, each SRS resource has four antenna ports for SRS transmission of eight antenna ports, and for two resources, N s If configured as 4, all four antenna ports can be sent for each symbol of the two SRS resources. In this case, multiple SRS resources can be included in the same SRS resource set, or can be included in different SRS resource sets respectively. The number of antenna ports N that can be represented by multiple SRS resources can be the number of antenna ports greater than 4, such as 6, 8, 12 or 16, and can be represented by SRS resources with 1, 2 or 4 antenna ports. The terminal may expect that all SRS resources included in each SRS resource group that can be configured by the base station or determined by the above-mentioned predetermined rule have the same number of antenna ports. In addition, the case where the number of antenna ports is different may not be excluded. For example, if 2 SRS resources are configured to represent N=8 antenna ports, each SRS resource can have 4 antenna ports.

[0588] Method 1-3, unlike the method based on a single SRS resource supported by the current specification, supports transmission to N antenna ports through multiple SRS resources, so some of the definitions of various time and frequency resource allocation related parameters in the above [Table 29] may need to be changed or newly defined. However, similar to method 1-2, since the number of antenna ports transmitted for each symbol of each SRS resource is less than or equal to N, which is the total number of antenna ports, the power transmitted for each port may increase.

[0589] [Method 1-4] Select one of the above [Method 1-1] to [Method 1-3]

[0590] The base station may statically or dynamically instruct the terminal to use one of the above-mentioned [methods 1-1] to [methods 1-3] to send SRS with N antenna ports. For example, the terminal may use one of the above-mentioned [methods 1-1] to [methods 1-3] by receiving one of the above-mentioned [methods 1-1] to [methods 1-3] as high-layer signaling from the base station, or it may be dynamically indicated by L1 signaling. One of two methods such as one of [methods 1-1] and [methods 1-2], one of [methods 1-1] and [methods 1-3], or one of [methods 1-2] and [methods 1-3] may be used by receiving it as high-layer signaling from the base station, or it may be dynamically indicated by L1 signaling. If the terminal is located inside the cell and the coverage is sufficient, the base station may configure the SRS transmission of N antenna ports to the terminal based on [method 1-1] through upper layer signaling, or dynamically indicate the SRS transmission of N antenna ports to the terminal through L1 signaling. For example, the method of dynamically indicating through L1 signaling may be indicated through a new field in the DCI format or by using a reserved code point of an existing DCI field. For example, an SRS request field may be used.

[0591] The terminal may report to the base station whether it supports at least one combination of the above [method 1-1] to [method 1-4] as UE capabilities. The UE capability report may be reported differently according to the frequency range (FR), and may be reported by frequency band, by frequency band combination, by feature set, or by feature set per CC. In addition, the above UE capabilities may be independent UE capabilities, or support for each method may be defined as multiple components within a single UE capability.

[0592] If the terminal supports at least one combination of the above [method 1-1] to [method 1-4], the usage as the upper layer signaling of the SRS resource set can enable codebook and antenna switching. In addition, the usage may not exclude the case where the usage is non-codebook and beam management.

[0593] If the terminal has multiple SRS resources configured in the same SRS resource set according to the above [methods 1-3], the maximum number of SRS resources in the SRS resource set that the terminal can be configured with through upper layer signaling can be 4 or more. If the terminal has multiple SRS resources configured in different SRS resource sets, the terminal can be configured with 2 or more SRS resource sets whose usage is a codebook through upper layer signaling.

[0594] Since the terminal uses multiple SRS resources for SRS transmission with N antenna ports when following the above [method 1-3], it may be necessary to change the definition of the code point in the SRS resource indicator (SRI) in DCI format 0_1, 0_2 sent from the base station for scheduling codebook-based PUSCH transmission. Currently, given that each code point of the SRI indicates a single SRS resource, if the terminal is configured to use the above [method 1-3] from the base station, the definition of the code point in the SRI field can be changed according to the following method.

[0595] [Method 1-3-1] SRS resource group indication

[0596] The terminal may assume that each code point of the SRI field in DCI formats 0_1 and 0_2 indicated from the base station indicates a group of SRS resources including multiple SRS resources. For example, if there are two code points of SRI, the first code point may indicate SRS resource group 0, and the second code point may indicate SRS resource group 1. In this case, SRS resource group 0 may include SRS resources 0 and 1, and SRS resource group 1 may include SRS resources 2 and 3. The terminal may be configured with such an SRS resource group by an upper layer from the base station. In addition, when multiple SRS resources are configured in the same SRS resource configured from the base station, the terminal may determine that a specific number in the low SRS resource index in the SRS resource set is a group, and the total number of antenna ports represented by multiple SRS resources may be configured for each SRS resource set. For example, if the number of antenna ports in the SRS resource set is configured as 8, the total number of SRS resources is configured as 4, and the index of each SRS resource is 0 to 3, then SRS resource indexes 0 and 1 may be the first SRS resource group, and SRS resource indexes 2 and 3 may be the second SRS resource group. In this case, the first code point of the SRI field may correspond to the first SRS resource group, and the second code point may correspond to the second SRS resource group.

[0597] [Method 1-3-2] Combined indication of multiple SRS resources similar to non-codebook

[0598] The terminal may assume that each code point of the SRI field in DCI formats 0_1 and 0_2 indicated by the base station represents a combination of a single or multiple SRS resources. This may be similar to the meaning of the SRI field in DCI formats 0_1 and 0_2 for scheduling non-codebook based PUSCH transmissions. If four SRS resources are configured in an SRS resource set in which usage is configured as noncodebook, each code point of the SRI field in DCI formats 0_1 and 0_2 for scheduling non-codebook based PUSCH transmissions may require a total of 2 4-1=15 code points, representing all methods for selecting one to four of the four SRS resources. Similar to the non-codebook method that considers all methods for selecting a subset from all configured SRS resources, method 1-3-2 may use methods that include some or all of the non-codebook methods. For example, assuming that the total number of configured SRS resources is M, if it is assumed that all M SRS resources have the same number of antenna ports, only combinations of a specific number of SRS resources among the M SRS resources may be considered. For example, only methods for selecting two SRS resources out of the M SRS resources may be considered. If it is assumed that the M SRS resources may have different numbers of antenna ports, the situation in which each combination of SRS resources has the same total number of antenna ports may be generated by considering combinations of a specific number or another specific number of SRS resources among the M SRS resources. For example, if four SRS resources each having two antenna ports and two SRS resources each having four antenna ports are configured in one SRS resource set, and multiple SRS resources are to be used to represent a total of eight antenna ports, a combination of two SRS resources each having four antenna ports can be used, or a combination of one SRS resource each having four antenna ports and two SRS resources each having two antenna ports can be used.

[0599] [Method 1-3-3] An SRS resource indication and an implicit indication of other SRS resources linked to the indicated SRS resource

[0600] The terminal may assume that each code point of the SRI field in DCI formats 0_1 and 0_2 indicated by the base station represents a single SRS resource, and the single SRS resource indicated by each code point may be connected to multiple other SRS resources. The connection may be established by upper layer signaling. The base station and the terminal may indicate multiple SRS resources connected to the SRS resource while indicating one SRS resource to the terminal through upper layer signaling without changing the definition of each code point of the SRI field.

[0601] The terminal may report to the base station whether it supports at least one combination of the above [method 1-3-1] to [method 1-3-3] as UE capabilities. The UE capability report may be reported differently according to the frequency range (FR), and may be reported by frequency band, by frequency band combination, by feature set, or by feature set per CC. In addition, the above UE capabilities may be independent UE capabilities, or support for each method may be defined as multiple components within a single UE capability.

[0602] For the above-mentioned [Method 1-3], if the terminal receives upper layer signaling for multiple SRS resources from the base station in order to use the above-mentioned [Method 1-3-1] to [Method 1-3-3], etc., the terminal can distinguish from the base station the various upper layer signaling configuration information in the SRS resources mentioned in the above [Table 29], the upper layer signaling configuration information that must be configured identically for all multiple SRS resources required to send SRS with N antenna ports, and the information that can be the same or different.

[0603] The terminal may expect that parameters such as groupOrSequenceHopping and sequenceId (which are parameters related to the order of SRS transmission among the parameters in [Table 29]) and resourceType (which indicates periodic, semi-static, and non-periodic transmission of SRS resources) are configured with the same values ​​for multiple SRS resources required to send SRS with N antenna ports.

[0604] The terminal may expect that, among the parameters in [Table 29], information related to time resource allocation of SRS (such as resourceMapping, resourceMapping-r16, and resourceMapping-17) and information related to frequency resource allocation (such as freqDomainPosition, freqDomainShift, and freqHopping) are configured to be the same or different for multiple SRS resources required to transmit SRS with N antenna ports. In addition, it may be expected that transmissionComb and transmissionComb-n8-r17 that determine the frequency and position of the transmission RE of the SRS have the same comb value for multiple SRS resources, and the comb offset may be configured to be the same or different. In addition, it may also be expected that the partial factor configured for the RB-level partial frequency detection operation of the SRS has the same value for multiple SRS resources.

[0605] The terminal may expect that information such as spatialrelationinfo, srs-TCIState-r17, etc., which are information for determining the transmission beam of SRS, among the parameters in [Table 29], is configured to be the same or different for multiple SRS resources. In particular, when multiple SRS resources are configured to different SRS resource sets, the terminal may expect that two parameters related to determining the transmission beam are configured differently for multiple SRS resources.

[0606] <Second Embodiment: SRS Time Resource Allocation, Repeated Transmission and Frequency Hopping Method>

[0607] As an example of the present disclosure, a method of SRS time resource allocation, repeated transmission, and frequency hopping according to the SRS resource configuration and indication method described in the above embodiments is described.

[0608] According to the above [Table 29], the terminal can determine the time domain transmission resource position of the SRS resource during frequency hopping through upper layer signaling (such as startPosition representing the transmission start symbol within the time slot of the SRS resource, nrofSymbols representing the number of symbols continuously transmitted from the transmission start symbol within the time slot, and repetitionFactor representing the number of consecutive symbols of the frequency resources having the same position when performing frequency hopping).

[0609] In the above embodiment, when [Method 1-1] is used, that is, when one SRS resource is configured for all N antenna ports and all N antenna ports are transmitted for each transmit symbol, the terminal can perform the following operations depending on the combination of startPosition, nrofSymbols and repetitionFactor as upper layer signaling to perform periodic / semi-persistent / aperiodic SRS transmission.

[0610] - The terminal may have nrofSymbols-r17 (hereinafter referred to as N s ) and repetitionFactor-r17 (hereinafter referred to as R) configured to 1. When frequency hopping is performed, only frequency hopping within a slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be 1 (=R).

[0611] The terminal may have N configured as a value greater than or equal to 4 as upper layer signaling for aperiodic SRS. s and R is configured to be greater than or equal to 2, where R can be N s A factor of , and when frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position can be R.

[0612] - A terminal may have N configured as 1 for periodic / semi-persistent SRS s and R is configured as 1, and when frequency hopping is performed, only slot-to-slot frequency hopping is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be 1 (=R).

[0613] - The terminal may have N configured as an upper layer signaling for periodic / semi-persistent SRS and having a value greater than or equal to 4 s and R is configured to be greater than or equal to 2, where R can be N s A factor of , and when frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0614] - The terminal may have N configured as an upper layer signaling for periodic / semi-persistent SRS and having a value greater than or equal to 4 s and is configured to be equal to N s The value of R, and when frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R (=N s ).

[0615] In the above embodiments, when [Method 1-2] is used, that is, when one SRS resource is configured with N antenna ports and some of the N antenna ports are transmitted for each transmit symbol, the terminal can perform the following operations by considering the definitions of startPosition, nrofSymbols, and repetitionFactor as upper layer signaling.

[0616] [Time Resource Operation 2-1]

[0617] As mentioned above, the terminal can s The definition of is considered to refer to the number of consecutive symbols on which the corresponding SRS resource is transmitted. If the terminal assumes that one SRS resource is configured with N antenna ports and some of the N antenna ports are transmitted for each transmission symbol, and if M symbols are required for all N antenna ports to be transmitted, the terminal may expect that the corresponding SRS resource is configured with M as a factor of N. s For example, if the terminal is configured with N=8 antenna ports, 4 antenna ports are transmitted for each transmit symbol, and all N=8 antenna ports are transmitted through M=2 symbols, the terminal may be configured with M=2 as a factor of N for the corresponding SRS resource. s = one of 2, 4, 8, 10, 12, 14. If N sis 4, then the number of consecutive symbols on which the corresponding SRS resource is transmitted is 4, and it can be expected that 4 antenna ports (e.g., SRS antenna ports 0 to 3) of the total 8 antenna ports are transmitted in the first and third symbols, and 4 antenna ports (e.g., SRS antenna ports 4 to 7) of the total 8 antenna ports are transmitted in the second and fourth symbols. This method of mapping and transmitting all N antenna ports in M ​​consecutive symbols and then mapping and transmitting all N antenna ports in the next M consecutive symbols may be referred to as a cyclic transmission method. Alternatively, it may be expected that 4 antenna ports (e.g., SRS antenna ports 0 to 3) of the total 8 antenna ports are transmitted in the first two symbols, and 4 antenna ports (e.g., SRS antenna ports 4 to 7) of the total 8 antenna ports are transmitted in the remaining two symbols. The method of repeatedly mapping and transmitting some of the N antenna ports in consecutive symbols and repeatedly mapping and transmitting the remaining some of the N antenna ports in the next consecutive symbols may be referred to as a sequential transmission method. The present disclosure may not be limited to the above example, and as another example, a case where 4 antenna ports among a total of 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6 may not be excluded.

[0618] The terminal may assume that the definition of R refers to the number of consecutive symbols having the same frequency resource at the same position where the corresponding SRS resource is transmitted, as described above. Therefore, as described above, the R value that the terminal may be configured with may be N s In this case, if the terminal assumes that M symbols are required for all N antenna ports to be transmitted when one SRS resource is configured with N antenna ports and some of the N antenna ports are transmitted for each transmit symbol, the minimum value of R can be 1 or M.

[0619] -If the minimum value of R that can be configured by the terminal is 1 and the terminal configures the value of R to 1, it means that the number of consecutive symbols with the same frequency resource is 1, and at this time, only some of the N antenna ports can be transmitted in one symbol, so the SRS corresponding to the corresponding antenna port can be transmitted at different frequency positions for each group of specific antenna ports among the N antenna ports. Therefore, since the SRS corresponding to all N antenna ports may not be transmitted at the same frequency position, when the base station receives the corresponding SRS and performs channel estimation, the channel information of the specific antenna port may not exist at some frequency resource positions, so it may be necessary to estimate the channel information of the frequency position where the channel information does not exist by using the frequency position where the channel information exists. In this case, the frequency band of the SRS transmission that the base station can estimate may become wider, but the channel estimation performance at the frequency position where the channel information of the specific antenna port does not exist may be degraded.

[0620] -If the minimum value of R that can be configured by the terminal is M and the terminal configures the value of R to M, it means that the number of consecutive symbols with the same frequency resource is M. At this time, since all N antenna ports can be transmitted during M symbols, the SRS corresponding to the N antenna ports can be transmitted at the same frequency position. Therefore, when the base station receives the corresponding SRS and performs channel estimation, it can obtain channel information of all N antenna ports at all frequency positions. In this case, compared with the case where the minimum value of R is 1, the frequency band of SRS transmission that the base station can estimate is reduced, but since all antenna ports are transmitted at all frequency positions, the channel estimation performance can be improved.

[0621] -The minimum value of R that the terminal can be configured with is 1 or M, which can be configured by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, activated / deactivated by MAC-CE signaling, or can operate as defined in the specification.

[0622] Based on the time resource operation 2-1, the terminal may perform the following operations depending on a combination of startPosition, nrofSymbols, and repetitionFactor as upper layer signaling to perform periodic / semi-persistent / aperiodic SRS transmission.

[0623] - A terminal may be configured with N of 2, 4, 8, 10, 12 or 14 for aperiodic SRS s and can be configured as 1 or M R, where M can be N s When frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be 1 or M (=R). The determination of the R value may follow one of the above methods.

[0624] - The terminal may use N as the upper layer signaling for aperiodic SRS s is configured to a value greater than or equal to 4, and R can be configured to a value greater than or equal to 2 or a value greater than or equal to M, where R or M can be N s When frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0625] - The terminal can set N for periodic / semi-persistent SRS s is configured as M, and R may be configured as M. When frequency hopping is performed, only frequency hopping between slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be M (=R).

[0626] - The terminal may use N as the upper layer signaling for periodic / semi-persistent SRS s is configured to a value greater than or equal to 4, and R can be configured to a value greater than or equal to 2 or a value greater than or equal to M, where R or M can be N s When frequency hopping is performed, frequency hopping within a slot or between slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0627] - The terminal may use N as the upper layer signaling for periodic / semi-persistent SRS s is configured to a value greater than or equal to 4, and R can be configured to be equal to N s When frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R (=N s ).

[0628] [Time Resource Operation 2-2]

[0629] If the number of symbols required for all antenna ports of the corresponding SRS resource to be transmitted is defined as M, the terminal may s The definition of is understood as the value of the number of times M symbols are used to send the corresponding SRS resource. In other words, instead of the existing definition of the number of consecutive symbols used to send an SRS resource, it can be defined as information about how many times the M symbol units for all N antenna ports configured in the SRS resource are used consecutively. For example, if the terminal is configured with N=8 antenna ports, and 4 antenna ports are transmitted for each transmission symbol, and all N=8 antenna ports are transmitted through M=2 symbols, the terminal can be configured with N s =1, 2, 4, 5, 6, 7 as information on how many times the M=2 symbol units are used consecutively for the corresponding SRS resource, and if N sis 2, then the total number of consecutive symbols sent for the corresponding SRS resource is 4, which may mean that M=2 symbol units are used twice in succession. In addition, it can be expected that 4 antenna ports (e.g., SRS antenna ports 0 to 3) out of a total of 8 antenna ports are sent in the first and third symbols, and the other 4 antenna ports (e.g., SRS antenna ports 4 to 7) out of a total of 8 antenna ports are sent in the second and fourth symbols. In this way, the method of sending by mapping all N antenna ports in M ​​consecutive symbols and then mapping all N antenna ports in the next consecutive M symbols can be referred to as a cyclic sending method. In another way, it can be expected that 4 antenna ports (e.g., SRS antenna ports 0 to 3) out of a total of 8 antenna ports are sent in the first two symbols, and 4 antenna ports (e.g., SRS antenna ports 4 to 7) out of a total of 8 antenna ports are sent in the remaining two symbols. In this way, the method of repeatedly mapping some of the N antenna ports in consecutive symbols and sending, and then repeatedly mapping the remaining some of the N antenna ports in the next consecutive symbols can be referred to as a sequential sending method. The present disclosure may not be limited to the above example, and as another example, it may not be excluded that 4 antenna ports among a total of 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6.

[0630] The terminal may assume that the definition of R refers to the number of consecutive symbols having the same frequency resource at the same position where the corresponding SRS resource is transmitted, as described above. Therefore, as described above, the R value that the terminal may be configured with may be N s In this case, if the terminal assumes that M symbols are required for all N antenna ports to be transmitted when one SRS resource is configured with N antenna ports and some of the N antenna ports are transmitted for each transmit symbol, the minimum value of R can be 1 or M.

[0631] -If the minimum value of R that can be configured by the terminal is 1 and the terminal configures the value of R to 1, it means that the number of consecutive symbols with the same frequency resource is 1, and at this time, only some of the N antenna ports can be transmitted in 1 symbol, so the SRS corresponding to the corresponding antenna port can be transmitted at different frequency positions for each group of specific antenna ports among the N antenna ports. Therefore, since the SRS corresponding to all N antenna ports may not be transmitted at the same frequency position, when the base station receives the corresponding SRS and performs channel estimation, the channel information of the specific antenna port may not exist at some frequency resource positions, so it may be necessary to estimate the channel information of the frequency position where the channel information does not exist by using the frequency position where the channel information exists. In this case, the frequency band of the SRS transmission that the base station can estimate may become wider, but the channel estimation performance at the frequency position where the channel information of the specific antenna port does not exist may be degraded.

[0632] -If the minimum value of R that can be configured by the terminal is M and the terminal configures the value of R to M, it means that the number of consecutive symbols with the same frequency resource is M. At this time, since all N antenna ports can be transmitted during M symbols, the SRS corresponding to the N antenna ports can be transmitted at the same frequency position. Therefore, when the base station receives the corresponding SRS and performs channel estimation, the channel information of all N antenna ports at all frequency positions can be obtained. In this case, compared with the case where the minimum value of R is 1, the frequency band of SRS transmission that the base station can estimate is reduced, but since all antenna ports are transmitted at all frequency positions, the channel estimation performance can be improved.

[0633] -The minimum value of R that the terminal can be configured with is 1 or M, which can be configured by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, activated / deactivated by MAC-CE signaling, or can operate as defined in the specification.

[0634] Based on the time resource operation 2-2, the terminal may perform the following operations depending on a combination of startPosition, nrofSymbols, and repetitionFactor as upper layer signaling to perform periodic / semi-persistent / aperiodic SRS transmission.

[0635] - A terminal may be configured with N of 1, 2, 4, 5, 6 or 7 for aperiodic SRS s , and R can be configured as 1 or M. When frequency hopping is performed, only frequency hopping within a slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position can be 1 or M (= R). The determination of the R value can follow one of the above methods.

[0636] - The terminal may use N as the upper layer signaling for aperiodic SRS s is configured as a value greater than or equal to 2 (= one of 2, 4, 5, 6, and 7), and R may be configured as a value greater than or equal to 2 or a value greater than or equal to M. When frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0637] - The terminal can set N for periodic / semi-persistent SRS s is configured as M, and R may be configured as M. When frequency hopping is performed, only frequency hopping between slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be M (=R).

[0638] - The terminal may use N as the upper layer signaling for periodic / semi-persistent SRS s is configured as a value greater than or equal to 2 (= one of 2, 4, 5, 6, and 7), and R may be configured as a value greater than or equal to 2 or a value greater than or equal to M. When frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0639] - The terminal can be used for N as upper layer signaling for periodic / semi-persistent SRS s is configured with a value greater than or equal to 2 (= one of 2, 4, 5, 6, 7), and R can be configured to be equal to M*N s When frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources in the same position may be R (=M*N s ).

[0640] In the above embodiments, when [Method 1-3] is used, that is, when N antenna ports are configured for a plurality of SRS resources as a whole and some of the N antenna ports are configured and transmitted for each SRS resource, the terminal can perform the following operations by considering the definitions of startPosition, nrofSymbols, and repetitionFactor as upper layer signaling, as described below.

[0641] [Time Resource Operation 3-1]

[0642] The terminal may configure the total number of symbols on which multiple SRS resources are transmitted to be N for each SRS resource. s If each of the n SRS resources is transmitted in M ​​symbols, then N s can be n*M, and Ns It may be configured as the same value in each SRS resource. If the terminal is configured with N antenna ports for multiple SRS resources, and some of the N antenna ports are transmitted for each SRS resource, and if it is assumed that each SRS resource to be transmitted for all N antenna ports requires m (m may be less than or equal to M) symbols, then the terminal may be configured with N having m and M as factors for each SRS resource. s For example, if the terminal is configured with two SRS resources that can represent N=8 antenna ports, and each SRS resource is transmitted in M=2 symbols, then for each of the multiple SRS resources, the terminal may be configured with N s = one of 2, 4, 8, 10, 12, 14, which has M = 2 as a factor, and if N s is 4, then the total number of symbols on which the multiple SRS resources are transmitted is 4, and it can be expected that four antenna ports (e.g., SRS antenna ports 0 to 3) of the total eight antenna ports are configured for the first SRS resource of the two SRS resources and are transmitted in the first and third symbols, and the other four antenna ports (e.g., SRS antenna ports 4 to 7) of the total eight antenna ports are configured for the second SRS resource and are transmitted in the second and fourth symbols. In this way, the method of transmitting by mapping all N antenna ports in M ​​consecutive symbols and then mapping all N antenna ports in the next M consecutive symbols can be called a cyclic transmission method. In another way, it can be expected that 4 antenna ports (e.g., SRS antenna ports 0 to 3) of the total 8 antenna ports are transmitted in the first two symbols, and 4 antenna ports (e.g., SRS antenna ports 4 to 7) of the total 8 antenna ports are transmitted in the remaining two symbols. In this way, the method of repeatedly mapping some of the N antenna ports in consecutive symbols and transmitting, and then repeatedly mapping some of the remaining N antenna ports in the next consecutive symbols can be called a sequential transmission method. The present disclosure may not be limited to the above example, and as another example, it may not be excluded that 4 antenna ports among a total of 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6.

[0643] The terminal may assume that the definition of R refers to the number of consecutive symbols having the same frequency resource at the same position where the corresponding SRS resource is transmitted, as described above. Therefore, as described above, the R value that the terminal may be configured with may be N s In this case, if the terminal is configured with multiple SRS resources for N antenna ports and some of the N antenna ports are transmitted for each SRS resource, and if it is assumed that m symbols are required for all N antenna ports to be transmitted, the minimum value of R can be 1 or m.

[0644] -If the minimum value of R that can be configured by the terminal is 1 and the terminal configures the value of R to 1, it means that the number of consecutive symbols with the same frequency resource is 1, and at this time, only some of the N antenna ports can be transmitted in 1 symbol, so the SRS corresponding to the corresponding antenna port can be transmitted at different frequency positions for each group of specific antenna ports among the N antenna ports. Therefore, since the SRS corresponding to all N antenna ports may not be transmitted at the same frequency position, when the base station receives the corresponding SRS and performs channel estimation, the channel information of the specific antenna port may not exist at some frequency resource positions, so it may be necessary to estimate the channel information of the frequency position where the channel information does not exist by using the frequency position where the channel information exists. In this case, the frequency band of the SRS transmission that the base station can estimate may become wider, but the channel estimation performance at the frequency position where the channel information of the specific antenna port does not exist may be degraded.

[0645] -If the minimum value of R that the terminal can configure is m and the terminal sets the value of R to m, it means that the number of consecutive symbols with the same frequency resource is m. At this time, since all N antenna ports can be transmitted during m symbols, the SRS corresponding to the N antenna ports can be transmitted at the same frequency position. Therefore, when the base station receives the corresponding SRS and performs channel estimation, the channel information of all N antenna ports at all frequency positions can be obtained. In this case, compared with the case where the minimum value of R is 1, the frequency band of SRS transmission that the base station can estimate is reduced, but since all antenna ports are transmitted at all frequency positions, the channel estimation performance can be improved.

[0646] -The minimum value of R that the terminal can be configured with is 1 or m, which can be configured by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, activated / deactivated by MAC-CE signaling, or can operate as defined in the specification.

[0647] Based on the time resource operation 3-1, the terminal may perform the following operations depending on a combination of startPosition, nrofSymbols, and repetitionFactor as upper layer signaling to perform periodic / semi-persistent / aperiodic SRS transmission.

[0648] - A terminal may be configured with N of 2, 4, 8, 10, 12 or 14 for aperiodic SRS s and can be configured as 1 or m R, where m can be N sWhen frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be 1 or m (=R). The determination of the R value may follow one of the above methods.

[0649] - The terminal may use N as the upper layer signaling for aperiodic SRS s is configured to a value greater than or equal to 4, and R can be set to a value greater than or equal to 2 or a value greater than or equal to m, where R or m can be N s When frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0650] - The terminal can set N for periodic / semi-persistent SRS s is configured as m, and R may be configured as m. When frequency hopping is performed, only slot-to-slot frequency hopping is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources in the same position may be m (=R).

[0651] - The terminal may use N as the upper layer signaling for periodic / semi-persistent SRS s is configured to a value greater than or equal to 4, and R can be configured to a value greater than or equal to 2 or a value greater than or equal to m, where R or m can be N s When frequency hopping is performed, frequency hopping within a slot or between slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0652] - The terminal may use N as the upper layer signaling for periodic / semi-persistent SRS s is configured to a value greater than or equal to 4, and R can be configured to be equal to N s When frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R (=N s ).

[0653] [Time Resource Operation 3-2]

[0654] The terminal may configure the number of symbols transmitted for each of the multiple SRS resources to be N for each SRS resource. s If a terminal is configured with N antenna ports for m SRS resources, and some of the N antenna ports are transmitted for each SRS resource, and if it is assumed that a total of m SRS resources for all N antenna ports to be transmitted require m symbols, then the terminal can expect a total of m*N symbols for all SRS resources. sFor example, if the terminal is configured with m=2 SRS resources that can represent N=8 antenna ports, and 4 antenna ports are used for each SRS resource in N symbols. s symbols, the terminal can configure N for each of the multiple SRS resources. s = one of 1, 2, 4, 5, 6, 7. If N s is 2, then the total number of symbols on which the two SRS resources are transmitted is 4, and it can be expected that 4 antenna ports (e.g., SRS antenna ports 0 to 3) of the total 8 antenna ports are configured for the first SRS resource of the two SRS resources and are transmitted in the first and third symbols, and the other 4 antenna ports (e.g., SRS antenna ports 4 to 7) of the total 8 antenna ports are configured for the second SRS resource and are transmitted in the second and fourth symbols. In this way, the method of mapping and transmitting all N antenna ports in M ​​consecutive symbols, and then mapping and transmitting all N antenna ports in the next M consecutive symbols can be called a cyclic transmission method. In another way, it can be expected that 4 antenna ports (e.g., SRS antenna ports 0 to 3) of the total 8 antenna ports are transmitted in the first two symbols, and the other 4 antenna ports (e.g., SRS antenna ports 4 to 7) of the total 8 antenna ports are transmitted in the remaining two symbols. In this way, the method of repeatedly mapping and transmitting some of the N antenna ports in consecutive symbols, and repeatedly mapping and transmitting some of the remaining N antenna ports in the next consecutive symbols can be called a sequential transmission method. The present disclosure may not be limited to the above example, and as another example, it may not be excluded that 4 antenna ports among a total of 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6.

[0655] The terminal may assume that the definition of R refers to the number of consecutive symbols having the same frequency resource at the same position where the corresponding SRS resource is transmitted, as described above. Therefore, as described above, the R value that the terminal may be configured with may be N s In this case, if the terminal is configured with multiple SRS resources for N antenna ports and some of the N antenna ports are transmitted for each SRS resource, and if it is assumed that m symbols are required for all N antenna ports to be transmitted, the minimum value of R can be 1 or m.

[0656] -If the minimum value of R that can be configured by the terminal is 1 and the terminal configures the value of R to 1, it means that the number of consecutive symbols with the same frequency resource is 1, and at this time, only some of the N antenna ports can be transmitted in 1 symbol, so the SRS corresponding to the corresponding antenna port can be transmitted at different frequency positions for each group of specific antenna ports among the N antenna ports. Therefore, since the SRS corresponding to all N antenna ports may not be transmitted at the same frequency position, when the base station receives the corresponding SRS and performs channel estimation, the channel information of the specific antenna port may not exist at some frequency resource positions, so it may be necessary to estimate the channel information of the frequency position where the channel information does not exist by using the frequency position where the channel information exists. In this case, the frequency band of the SRS transmission that the base station can estimate may become wider, but the channel estimation performance at the frequency position where the channel information of the specific antenna port does not exist may be degraded.

[0657] -If the minimum value of R that the terminal can configure is m and the terminal sets the value of R to m, it means that the number of consecutive symbols with the same frequency resource is m. At this time, since all N antenna ports can be transmitted during m symbols, the SRS corresponding to the N antenna ports can be transmitted at the same frequency position. Therefore, when the base station receives the corresponding SRS and performs channel estimation, the channel information of all N antenna ports at all frequency positions can be obtained. In this case, compared with the case where the minimum value of R is 1, the frequency band of SRS transmission that the base station can estimate is reduced, but since all antenna ports are transmitted at all frequency positions, the channel estimation performance can be improved.

[0658] -The minimum value of R that the terminal can be configured with is 1 or m, which can be configured by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, activated / deactivated by MAC-CE signaling, or can operate as defined in the specification.

[0659] Based on the time resource operation 3-2, the terminal may perform the following operations depending on a combination of startPosition, nrofSymbols, and repetitionFactor as upper layer signaling to perform periodic / semi-persistent / aperiodic SRS transmission.

[0660] - A terminal may be configured with N of 1, 2, 4, 5, 6 or 7 for aperiodic SRS s , and R can be configured as 1 or M. When frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position can be 1 or m (= R). The determination of the R value can follow one of the above methods.

[0661] - The terminal may use N as the upper layer signaling for aperiodic SRS s is configured as a value greater than or equal to 2 (= one of 2, 4, 5, 6, and 7), and R may be configured as a value greater than or equal to 2 or a value greater than or equal to m. When frequency hopping is performed, only frequency hopping within a time slot is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0662] - The terminal can set N for periodic / semi-persistent SRS s is configured to 1, and R may be configured to 1. When frequency hopping is performed, only slot-to-slot frequency hopping may be possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0663] - The terminal may use N as the upper layer signaling for periodic / semi-persistent SRS s is configured as a value greater than or equal to 2 (= one of 2, 4, 5, 6, and 7), and R may be configured as a value greater than or equal to 2 or a value greater than or equal to m. When frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same position may be R.

[0664] - The terminal can be used for N as upper layer signaling for periodic / semi-persistent SRS s is configured with a value greater than or equal to 2 (= one of 2, 4, 5, 6, 7), and can be configured to be equal to m*N s When frequency hopping is performed, frequency hopping within a time slot or between time slots is possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources in the same position may be R (=m*N s ).

[0665] The terminal may report to the base station whether it supports at least one combination of the above-mentioned [time resource operation 2-1], [time resource operation 2-2], [time resource operation 3-1] and [time resource operation 3-2] as UE capabilities. The UE capability report may be reported differently according to the frequency range (FR), and may be reported by frequency band, by frequency band combination, by feature set, or by feature set per CC. In addition, the above-mentioned UE capabilities may be independent UE capabilities, or support for each method may be defined as multiple components within a single UE capability.

[0666] The terminal may be configured by higher layer signaling from the base station, indicated by L1 signaling, notified by a combination of higher layer signaling and L1 signaling, activated / deactivated by MAC-CE signaling, or may operate as defined in the specification for at least one combination of the above [Time Resource Operation 2-1], [Time Resource Operation 2-2], [Time Resource Operation 3-1] and [Time Resource Operation 3-2].

[0667] Fig. 20 is a diagram illustrating an operation of a terminal for SRS transmission according to one embodiment of the present disclosure.

[0668] The terminal may report UE capabilities to the base station (20-00). The UE capability report may be a combination of at least one of the UE capabilities mentioned in the above embodiments. For example, the UE capabilities reported by the terminal may include an indication of whether [method 1-1] to [method 1-4] are supported, whether [method 1-3-1] to [method 1-3-3] are supported, and whether [time resource operation 2-1], [time resource operation 2-2], [time resource operation 3-1] and [time resource operation 3-2] are supported. At least one of the UE capabilities. Thereafter, the terminal may receive upper layer signaling configuration information (20-05) from the base station. The upper layer signaling may be a combination of at least one of the upper layer signaling configuration information mentioned in the above embodiments. For example, it may be a related upper layer signaling for at least one of the above [method 1-1] to [method 1-4], [method 1-3-1] to [method 1-3-3], [time resource operation 2-1], [time resource operation 2-2], [time resource operation 3-1] and [time resource operation 3-2]. The terminal may further receive MAC-CE and / or L1 signaling (20-10) from the base station. For example, it may be related MAC-CE and / or L1 signaling for at least one of the above-mentioned [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], [Time Resource Operation 2-2], [Time Resource Operation 3-1] and [Time Resource Operation 3-2]. The terminal may send an SRS with N antenna ports based on an indication from the base station received through the above-mentioned upper layer signaling and MAC-CE and / or L1 signaling (20-15).

[0669] Fig.21 is a diagram illustrating an operation of a base station for SRS reception according to one embodiment of the present disclosure.

[0670] The base station may receive UE capabilities from the terminal (21-00). The UE capability report may be a combination of at least one of the UE capabilities mentioned in the above embodiments. For example, the UE capabilities reported by the terminal may include an indication of whether [method 1-1] to [method 1-4] are supported, whether [method 1-3-1] to [method 1-3-3] are supported, and whether [time resource operation 2-1], [time resource operation 2-2], [time resource operation 3-1] and [time resource operation 3-2] are supported. At least one of the UE capabilities. Thereafter, the base station may send upper layer signaling configuration information to the terminal (21-05). The upper layer signaling may be a combination of at least one of the upper layer signaling configuration information mentioned in the above embodiments. For example, it may be a related upper layer signaling for at least one of the above [method 1-1] to [method 1-4], [method 1-3-1] to [method 1-3-3], [time resource operation 2-1], [time resource operation 2-2], [time resource operation 3-1] and [time resource operation 3-2]. The base station may further send MAC-CE and / or L1 signaling to the terminal (21-10). For example, it may be related MAC-CE and / or L1 signaling for at least one of the above-mentioned [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], [Time Resource Operation 2-2], [Time Resource Operation 3-1] and [Time Resource Operation 3-2]. The base station may receive the SRS with N antenna ports sent by the terminal based on the information indicated by the above-mentioned upper layer signaling and MAC-CE and / or L1 signaling (21-15).

[0671] Fig. 22 is a diagram showing a structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0672] refer to Fig. 22 , the terminal may include a transceiver (which refers to a terminal receiving unit 2200 and a terminal sending unit 2210), a memory (not shown) and a terminal processing unit 2205 (or a terminal control unit or a processor). Depending on the communication method of the above-mentioned terminal, the transceivers 2200 and 2210, the memory and the terminal processing unit 2205 of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or less components than the above-mentioned components. In addition, the transceiver, the memory and the processor may be implemented in the form of a single chip.

[0673] The transceiver can send and receive signals with the base station. Here, the signal may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that low-noise amplifies the received signal and down-converts the frequency, etc. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and the RF receiver.

[0674] In addition, the transceiver may receive a signal through a wireless channel and output it to the processor, and transmit a signal output from the processor through the wireless channel.

[0675] The memory may store programs and data required for the operation of the terminal. In addition, the memory may store control information or data included in the signals sent and received by the terminal. The memory may be composed of a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, or a combination of storage media. In addition, there may be multiple memories.

[0676] In addition, the processor can control a series of processes so that the terminal can operate according to the above-mentioned embodiment. For example, the processor can control the components of the terminal to receive DCI composed of two layers and receive multiple PDSCHs at the same time. There may be multiple processors, and the processor can perform the component control operation of the terminal by executing the program stored in the memory.

[0677] Fig.23 is a diagram showing a structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0678] refer to Fig.23 , the base station may include a transceiver (which refers to a base station receiver 2300 and a base station transmitter 2310), a memory (not shown), and a base station processing unit 2305 (or a base station control unit or processor). According to the communication method of the above-mentioned base station, the transceivers 2300 and 2310, the memory, and the base station processing unit 2305 of the base station can operate. However, the components of the base station are not limited to the above examples. For example, the base station may include more or fewer components than the above components. In addition, the transceiver, the memory, and the processor can be implemented in the form of a single chip.

[0679] The transceiver can send and receive signals with the terminal. Here, the signal may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that low-noise amplifies and down-converts the received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and the RF receiver.

[0680] In addition, the transceiver may receive a signal through a wireless channel and output it to the processor, and transmit a signal output from the processor through the wireless channel.

[0681] The memory may store programs and data required for the operation of the base station. In addition, the memory may store control information or data included in the signals sent and received by the base station. The memory may be composed of a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, or a combination of storage media. In addition, there may be multiple memories.

[0682] The processor may control a series of processes so that the base station may operate according to the above-mentioned embodiments of the present disclosure. For example, the processor may configure two layers of DCI including allocation information of multiple PDSCHs and control each component of the base station to send them. There may be multiple processors, and the processor may perform component control operations of the base station by executing a program stored in a memory.

[0683] The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0684] In the case of software implementation, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors in an electronic device. One or more programs include instructions that cause the electronic device to perform the method according to the embodiments described in the claims or description of the present disclosure.

[0685] These programs (software modules, software) may be stored in non-volatile memory (including random access memory, flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, compact disk-ROM (CD-ROM), digital versatile disk (DVD) or other forms of optical storage, magnetic tape cassettes). Alternatively, they may be stored in a memory consisting of a combination of some or all of these. In addition, each configuration memory may be included in plural.

[0686] In addition, the program can be stored in an attachable storage device that can be accessed through a communication network (such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), or a storage area network (SAN), or a combination thereof). The storage device can be connected to a device that performs an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network can be connected to a device that performs an embodiment of the present disclosure.

[0687] In the specific embodiments of the present disclosure described above, the components included in the present invention are expressed in singular or plural form, depending on the specific embodiment presented. However, for ease of explanation, singular or plural expression is appropriately selected for the presented situation, and the present disclosure is not limited to singular or plural components, and even if a component is expressed in plural form, it may also be composed of singular form, or even if a component is expressed in singular form, it may also be composed of plural form.

[0688] At the same time, the embodiments of the present disclosure disclosed in this specification and the accompanying drawings are only specific examples presented to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it is clear to a person of ordinary skill in the art to which the present disclosure belongs that other modified examples based on the technical concept of the present disclosure are possible. In addition, the above-mentioned embodiments may also be combined and operated as needed. For example, a part of an embodiment of the present disclosure and a part of another embodiment may be combined and operated to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure may be combined and operated to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been presented on the basis of an FDD LTE system, other modified examples of the technical ideas based on the above-mentioned embodiments may be implemented in other systems such as a TDD LTE system, a 5G or an NR system.

[0689] Meanwhile, the order of description in the drawings for explaining the method of the present invention does not necessarily correspond to the order of execution, and the order of priority may be changed or executed in parallel.

[0690] Alternatively, the drawings illustrating the method of the present invention may omit some components and include only some components without damaging the essence of the present invention.

[0691] Furthermore, the method of the present invention may be implemented by combining some or all of the elements included in each embodiment without impairing the essence of the present invention.

[0692] Various embodiments of the present disclosure have been described above. The above description of the present disclosure is for illustrative purposes, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art to which the present disclosure belongs will understand that the present disclosure can be easily modified into other specific forms without changing the technical ideas or essential features of the present disclosure. The scope of the present disclosure is indicated by the described claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included within the scope of the present disclosure.

Claims

1. A method performed by a terminal of a communication system, the method comprising: The number (N) of orthogonal frequency division multiplexing OFDM symbols associated with a sounding reference signal SRS resource is received from the base station. s ) and configuration information of the number of antenna ports (N) associated with the SRS resources; identifying an antenna port mapped to each of the OFDM symbols associated with the SRS resource; and Based on the antenna port mapped to each OFDM symbol, an SRS is transmitted to the base station in an OFDM symbol associated with an SRS resource, wherein: N is 8 or greater.

2. The method according to claim 1, wherein: N antenna ports are mapped for each OFDM symbol associated with an SRS resource.

3. The method according to claim 1, wherein: The N antenna ports include a first subset and a second subset including a number of antenna ports less than N; The first subset and the second subset include different antenna ports; The antenna ports included in the first subset are mapped to a first OFDM symbol in the OFDM symbols associated with the SRS resource; and The antenna ports included in the second subset are mapped to a second OFDM symbol among the OFDM symbols associated with the SRS resource.

4. The method according to claim 3, wherein: The first OFDM symbol comprises an odd-numbered symbol among OFDM symbols associated with an SRS resource; and The second OFDM symbol includes even-numbered symbols among OFDM symbols associated with the SRS resource.

5. A method performed by a base station of a communication system, the method comprising: The number (N) of orthogonal frequency division multiplexing OFDM symbols associated with the sounding reference signal SRS resource is sent to the terminal. s ) and configuration information of the number of antenna ports (N) associated with the SRS resources; identifying an antenna port mapped to each of the OFDM symbols associated with the SRS resource; and An SRS is received from a terminal in an OFDM symbol associated with an SRS resource based on an antenna port mapped to each OFDM symbol, wherein: N is 8 or greater.

6. The method according to claim 5, wherein: N antenna ports are mapped for each OFDM symbol associated with an SRS resource.

7. The method according to claim 5, wherein: The N antenna ports include a first subset and a second subset including a number of antenna ports less than N; The first subset and the second subset include different antenna ports; The antenna ports included in the first subset are mapped to a first OFDM symbol in the OFDM symbols associated with the SRS resource; and The antenna ports included in the second subset are mapped to a second OFDM symbol among the OFDM symbols associated with the SRS resource.

8. The method according to claim 7, wherein: The first OFDM symbol comprises an odd-numbered symbol among OFDM symbols associated with an SRS resource; and The second OFDM symbol includes even-numbered symbols among OFDM symbols associated with the SRS resource.

9. A terminal of a communication system, comprising: Transceiver; and A control unit configured to: The number (N) of orthogonal frequency division multiplexing OFDM symbols associated with a sounding reference signal SRS resource is received from the base station. s ) and configuration information of the number of antenna ports (N) associated with the SRS resources; identifying an antenna port mapped to each of the OFDM symbols associated with the SRS resource; and Based on the antenna port mapped to each OFDM symbol, an SRS is transmitted to the base station in an OFDM symbol associated with an SRS resource, wherein: N is 8 or greater.

10. The terminal according to claim 9, wherein: N antenna ports are mapped for each OFDM symbol associated with an SRS resource.

11. The terminal according to claim 9, wherein: The N antenna ports include a first subset and a second subset including a number of antenna ports less than N; The first subset and the second subset include different antenna ports; The antenna ports included in the first subset are mapped to a first OFDM symbol in the OFDM symbols associated with the SRS resource; and The antenna ports included in the second subset are mapped to a second OFDM symbol among the OFDM symbols associated with the SRS resource.

12. The terminal according to claim 11, wherein: The first OFDM symbol comprises an odd-numbered symbol among OFDM symbols associated with an SRS resource; and The second OFDM symbol includes even-numbered symbols among OFDM symbols associated with the SRS resource.

13. A base station of a communication system, comprising: Transceiver; and A control unit configured to: The number (N) of orthogonal frequency division multiplexing OFDM symbols associated with the sounding reference signal SRS resource is sent to the terminal. s ) and configuration information of the number of antenna ports (N) associated with the SRS resources; identifying an antenna port mapped to each of the OFDM symbols associated with the SRS resource; and An SRS is received from a terminal in an OFDM symbol associated with an SRS resource based on an antenna port mapped to each OFDM symbol, wherein: N is 8 or greater.

14. The base station according to claim 13, wherein: N antenna ports are mapped for each OFDM symbol associated with an SRS resource.

15. The base station according to claim 13, wherein: The N antenna ports include a first subset and a second subset including a number of antenna ports less than N; The first subset and the second subset include different antenna ports; The antenna ports included in the first subset are mapped to a first OFDM symbol in the OFDM symbols associated with the SRS resource; and The antenna ports included in the second subset are mapped to a second OFDM symbol among the OFDM symbols associated with the SRS resource.

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