Method and apparatus for transmitting multi-waveform-based downlink channel in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure relates to a method and apparatus for transmitting a multi-waveform-based downlink channel. The present disclosure relates to a method and apparatus for processing overlapping resources when a downlink channel, and another downlink channel or downlink signal having a different waveform from the downlink channel overlap.

Description

Method and device for transmitting a multi-waveform-based downlink channel in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method and apparatus for handling overlapping resources when a downlink channel and another downlink channel or downlink signal having a waveform different from that of the downlink channel overlap.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for the reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

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

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

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms to guarantee coverage in the terahertz band of 6G mobile communication technology, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas; metamaterial-based lenses and antennas to improve terahertz band signal coverage; high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum); and Reconfigurable Intelligent Surface (RIS) technology; as well as Full Duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] The present disclosure aims to provide an apparatus and method capable of effectively providing services in a mobile communication system.

[0009] In addition, the present disclosure aims to provide a method and apparatus for processing overlapping resources when a downlink channel and another downlink channel or downlink signal having a waveform different from that of the downlink channel overlap.

[0010] The present disclosure for solving the above-mentioned problems comprises a method performed by a terminal in a wireless communication system, the method comprising: identifying whether a downlink signal of a first waveform and a PDSCH (physical downlink shared channel) of a second waveform overlap; determining that, if the downlink signal and the PDSCH overlap, rate matching for the PDSCH is applied at the symbol where the downlink signal and the PDSCH overlap; and receiving the PDSCH from a base station based on the rate matching.

[0011] Additionally, the present disclosure comprises a method performed by a base station in a wireless communication system, the method including: identifying whether a downlink signal of a first waveform and a physical downlink shared channel (PDSCH) of a second waveform overlap for a terminal; if the downlink signal and the PDSCH overlap, performing rate matching for the PDSCH at the symbol where the downlink signal and the PDSCH overlap; and transmitting the PDSCH to the terminal based on the rate matching.

[0012] Additionally, the present disclosure comprises, in a terminal of a wireless communication system, at least one transceiver; at least one processor connected to the at least one transceiver so as to be communicable; and a memory connected to the at least one processor so as to be communicable and executable individually or in any combination of the at least one processor, wherein the terminal identifies whether a downlink signal of a first waveform and a PDSCH (physical downlink shared channel) of a second waveform overlap, and if the downlink signal and the PDSCH overlap, determines that rate matching for the PDSCH is applied at the symbol where the downlink signal and the PDSCH overlap, and stores a command to receive the PDSCH from a base station based on the rate matching.

[0013] Additionally, the present disclosure comprises, in a base station of a wireless communication system, at least one transceiver; at least one processor connected to the at least one transceiver so as to be communicable; and a memory connected to the at least one processor so as to be communicable and executable by the at least one processor individually or in any combination thereof, wherein the base station identifies whether a downlink signal of a first waveform and a physical downlink shared channel (PDSCH) of a second waveform overlap with a terminal, and if the downlink signal and the PDSCH overlap, performs rate matching for the PDSCH at the symbol where the downlink signal and the PDSCH overlap, and stores an instruction to transmit the PDSCH to the terminal based on the rate matching.

[0014] According to various embodiments of the present disclosure, an apparatus and method capable of effectively providing services in a mobile communication system can be provided.

[0015] In addition, according to various embodiments of the present disclosure, when a downlink channel and another downlink channel or downlink signal having a waveform different from that of the downlink channel overlap, a method and apparatus for processing the overlapped resources may be provided.

[0016] FIG. 1 is a diagram illustrating the basic structure of the time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0017] FIG. 2 is a drawing illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0018] FIG. 3 is a drawing illustrating an example of a bandwidth portion setting in a wireless communication system according to one embodiment of the present disclosure.

[0019] FIG. 4 is a diagram illustrating the wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation in a wireless communication system according to one embodiment of the present disclosure.

[0020] FIG. 5 is a diagram illustrating a method for a base station and a terminal to transmit and receive data by considering downlink data channels and rate matching resources.

[0021] Figure 6 is a diagram illustrating an example of a control resource set (CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system.

[0022] Figure 7 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G.

[0023] FIG. 8 is a diagram illustrating an example of frequency axis resource allocation of PDSCH or PUSCH in a wireless communication system according to one embodiment of the present disclosure.

[0024] FIG. 9 is a diagram showing the VRB-PRB interleaving method of PDSCH during FDRA type-1 resource allocation according to one embodiment of the present disclosure.

[0025] FIG. 10 is a diagram illustrating an example of time axis resource allocation of PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0026] FIG. 11 is a transmission block diagram according to one embodiment of the present disclosure.

[0027] FIG. 12 is a diagram showing a downlink channel / signal scheduling situation within a slot according to one embodiment of the present disclosure.

[0028] FIG. 13 is a diagram showing PDSCH transmission resource symbol level rate matching when different waveforms are superimposed according to one embodiment of the present disclosure.

[0029] FIGS. 14A, 14B, and 14C are drawings illustrating a method for a terminal to determine a rate-matching pattern according to one embodiment of the present disclosure.

[0030] FIG. 15 is a diagram illustrating a situation in which a PDSCH and another downlink channel or downlink signal overlap according to one embodiment of the present disclosure.

[0031] FIG. 16 is a diagram illustrating a method of moving the DMRS start symbol of PDSCH according to one embodiment of the present disclosure.

[0032] FIG. 17 is a diagram showing that when different waveforms are superimposed according to one embodiment of the present disclosure, the starting symbol of a PDSCH resource is moved by a symbol offset.

[0033] FIGS. 18A and FIGS. 18B are drawings showing PDSCH resources extending beyond slot boundaries according to one embodiment of the present disclosure.

[0034] FIG. 19 is a diagram showing a situation in which PDSCH and CSI-RS overlap according to one embodiment of the present disclosure.

[0035] FIG. 20 is a drawing showing a PDSCH priority indicator according to one embodiment of the present disclosure.

[0036] FIG. 21 illustrates the structure of a terminal in a wireless communication system according to embodiments of the present disclosure.

[0037] FIG. 22 illustrates the structure of a base station in a wireless communication system according to embodiments of the present disclosure.

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0039] In describing the embodiments, technical details that are well known in the art to which this disclosure belongs and are not directly related to this disclosure are omitted. This is intended to convey the essence of this disclosure more clearly without obscuring it by omitting unnecessary explanations.

[0040] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0041] The advantages and features of the present disclosure, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the disclosure, the same reference numerals refer to the same components. Furthermore, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration might unnecessarily obscure the essence of the present disclosure, such detailed description is omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout the present disclosure.

[0042] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0043] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0044] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0045] Wireless communication systems are evolving from providing early voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards like 3GPP’s HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2’s HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE’s 802.16e.

[0046] As a representative example of the above-mentioned broadband wireless communication system, the LTE system employs the Orthogonal Frequency Division Multiplexing (OFDM) method for the downlink (DL) and the Single Carrier Frequency Division Multiple Access (SC-FDMA) method for the uplink (UL). The uplink refers to a wireless link through which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B, or base station (BS)), and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. The above-mentioned multiple access method can distinguish the data or control information of each user by allocating and operating time-frequency resources to be sent for each user so that they do not overlap, that is, so that orthogonality is established.

[0047] As a future communication system following LTE, that is, a 5G communication system, it must be able to freely reflect the diverse requirements of users and service providers, and therefore, services that satisfy various requirements simultaneously must be supported. Services being considered for the 5G communication system include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0048] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing these peak data rates, the 5G communication system must also provide an increased user-perceived data rate. To satisfy these requirements, it necessitates improvements in various transmission and reception technologies, including enhanced Multi-Input Multi-Output (MIMO) transmission technology. Additionally, while LTE transmits signals using a maximum bandwidth of 20 MHz in the 2 GHz band, the 5G communication system can meet the data transmission speeds required by using a frequency bandwidth wider than 20 MHz in frequency bands of 3–6 GHz or above 6 GHz.

[0049] Simultaneously, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide IoT, mMTC requires support for a large number of terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT devices are attached to various sensors and equipment to provide communication functions, the system must be able to support a large number of terminals within a cell (e.g., 1,000,000 terminals / km²). Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in dead zones not covered by cells, such as building basements; therefore, they may require wider coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must consist of low-cost devices, and since it is difficult to frequently replace terminal batteries, a very long battery life of 10 to 15 years may be required.

[0050] Finally, URLLC is a mission-critical cellular-based wireless communication service. For example, consider services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts. Therefore, the communication provided by URLLC must offer very low latency and very high reliability. For instance, services supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and simultaneously 10 -5The following packet error rate requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a Transmit Time Interval (TTI) smaller than other services, and at the same time, design considerations may be required to allocate a wide resource in the frequency band to ensure the reliability of the communication link.

[0051] The three 5G services, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted within a single system. In this case, different transmission and reception techniques and parameters may be used between the services to satisfy the different requirements of each service. Of course, 5G is not limited to the three services mentioned above.

[0052] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a gNode B, eNode B, Node B, BS (Base Station), wireless access unit, base station controller, or a node on a network. A terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted by a terminal to a base station. Furthermore, while LTE or LTE-A systems may be described as examples below, embodiments of this disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technologies (5G, new radio, NR) developed after LTE-A may be included therein, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0053] Hereinafter, a / b may be understood as at least one of a or b.

[0054] In various embodiments of the present disclosure, transmitting and receiving a channel can be interpreted / defined as transmitting and receiving signals, data, etc. on the channel.

[0055] [NR Time-Frequency Resources]

[0056] The frame structure of the 5G system will be explained in more detail below with reference to the drawings.

[0057] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a wireless resource domain where data or control channels are transmitted in a 5G system.

[0058] The horizontal axis of FIG. 1 represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of a resource is a resource element (RE, 101), which can be defined as one OFDM (Orthogonal Frequency Division Multiplexing) symbol (102) on the time axis and one subcarrier (103) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can form a single resource block (Resource Block, RB, 104). In the time axis, a single subframe (110) may contain multiple OFDM symbols (102). For example, the length of one subframe may be 1 ms.

[0059] FIG. 2 is a drawing illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0060] FIG. 2 illustrates an example of a frame (200), subframe (201), and slot (202) structure. One frame (200) can be defined as 10ms. One subframe (201) can be defined as 1ms, and thus one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot). = 14). A subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In one example of FIG. 2, cases where μ=0 (204) and μ=1 (205) are shown as the subcarrier spacing setting value.

[0061] When μ=0 (204), 1 subframe (201) can be composed of 1 slot (202), and when μ=1 (205), 1 subframe (201) can be composed of 2 slots (203). That is, depending on the setting value μ for the subcarrier spacing, the number of slots per subframe ( ) may vary, and accordingly, the number of slots per frame ( ) may vary. Depending on each subcarrier spacing setting μ and It can be defined as shown in Table 1 below.

[0062] [Table 1]

[0063]

[0064] [Bandwidth Section (BWP)]

[0065] Next, the Bandwidth Part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0066] FIG. 3 is a drawing illustrating an example of a bandwidth portion setting in a wireless communication system according to one embodiment of the present disclosure.

[0067] FIG. 3 shows an example in which the terminal bandwidth (UE bandwidth) (300) is configured into two bandwidth portions, namely bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station may configure one or more bandwidth portions for the terminal and may configure information such as that shown in Table 2 below for each bandwidth portion.

[0068] [Table 2]

[0069]

[0070] Of course, the above examples are not limited, and various parameters related to bandwidth portions may be configured for the terminal in addition to the above configuration information. The above information may be transmitted by the base station to the terminal via higher-layer signaling, for example, Radio Resource Control (RRC) signaling. At least one of the configured bandwidth portions may be activated. Whether a configured bandwidth portion is activated may be transmitted semi-statically from the base station to the terminal via RRC signaling or dynamically via Downlink Control Information (DCI).

[0071] According to some embodiments, prior to the RRC connection, the terminal may receive an Initial Bandwidth Part (Initial BWP) for initial connection from the base station via a Master Information Block (MIB). More specifically, during the initial connection phase, the terminal may receive configuration information for a Control Resource Set (CORESET) and a Search Space via the MIB, through which a PDCCH can be transmitted to receive system information required for initial connection (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)). The Control Resource Set and Search Space configured via the MIB may each be considered as Identity (ID) 0. The base station may notify the terminal via the MIB of configuration information, such as frequency allocation information, time allocation information, and numerology, for Control Resource Set #0. Additionally, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and monitoring occasion for Control Resource Set #0, i.e., configuration information for Search Space #0. The terminal may consider the frequency region set as control region #0 obtained from the MIB as the initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be considered as 0.

[0072] The settings for the bandwidth portion supported by the above 5G can be used for various purposes.

[0073] According to some embodiments, if the bandwidth supported by the terminal is smaller than the system bandwidth, this can be supported through the bandwidth portion setting. For example, by setting the frequency position of the bandwidth portion (setting information 2) to the terminal, the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

[0074] In addition, according to some embodiments, a base station may set multiple bandwidth portions for a terminal for the purpose of supporting different numerologies. For example, to support data transmission and reception using both a 15 kHz subcarrier interval and a 30 kHz subcarrier interval for a terminal, two bandwidth portions may be set to subcarrier intervals of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be frequency division multiplexed (FDM), and when data transmission and reception is to be performed with a specific subcarrier interval, the bandwidth portion set to that subcarrier interval may be activated.

[0075] In addition, according to some embodiments, a base station may set a bandwidth portion having different bandwidth sizes for the purpose of reducing the power consumption of the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits and receives data using that bandwidth, very large power consumption may occur. In particular, in a situation where there is no traffic, performing monitoring of an unnecessary downlink control channel using a large bandwidth of 100 MHz can be very inefficient in terms of power consumption. To reduce the power consumption of the terminal, the base station may set a bandwidth portion of a relatively small bandwidth, such as 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0076] In the method for configuring the above bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the Initial Bandwidth Part (Initial BWP) through the MIB during the initial connection phase. More specifically, the terminal can receive a configuration of a control area (i.e., CORESET) for a downlink control channel through which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control area configured by the MIB can be considered as the Initial Bandwidth Part, and through the configured Initial Bandwidth Part, the terminal can receive the Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted. In addition to the purpose of receiving the SIB, the Initial Bandwidth Part may also be utilized for other system information (OSI), paging, and random access.

[0077] [Bandwidth Section (BWP) Change]

[0078] When one or more bandwidth parts are set for a terminal, the base station may instruct the terminal to change (or switch, transition) the bandwidth part using the Bandwidth Part Indicator field within the DCI. For example, in FIG. 3, if the currently active bandwidth part of the terminal is Bandwidth Part #1 (301), the base station may instruct the terminal to Bandwidth Part #2 (302) using the Bandwidth Part Indicator within the DCI, and the terminal may perform a bandwidth part change to Bandwidth Part #2 (302) indicated by the received Bandwidth Part Indicator within the DCI.

[0079] As mentioned above, since DCI-based bandwidth portion changes can be directed by the DCI scheduling PDSCH or PUSCH, when a terminal receives a bandwidth portion change request, it must be able to receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI in the changed bandwidth portion without difficulty. To this end, the standard specifies the delay time (T) required when changing the bandwidth portion. BWP The requirements for ) have been specified and can be defined, for example, as shown in [Table 3] below.

[0080] [Table 3]

[0081]

[0082] The requirements for bandwidth portion change delay time support Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth portion delay time type to the base station.

[0083] In accordance with the aforementioned requirements for bandwidth portion change delay time, if the terminal receives a DCI containing a bandwidth portion change indicator in slot n, the terminal performs a change to the new bandwidth portion indicated by the bandwidth portion change indicator in slot n+T BWP Completion can be performed at a time no later than the new bandwidth portion, and transmission and reception for the data channel scheduled by the corresponding DCI can be performed in the changed new bandwidth portion. If the base station intends to schedule a data channel in the new bandwidth portion, the terminal's bandwidth portion change delay time (T BWP By considering ), time-domain resource allocation for a data channel can be determined. That is, when a base station schedules a data channel with a new bandwidth portion, in the method for determining time-domain resource allocation for a data channel, the data channel can be scheduled after the bandwidth portion change delay time. Accordingly, the terminal [is notified] that the DCI instructing the bandwidth portion change is the bandwidth portion change delay time (TBWP You may not expect to indicate a slot offset (K0 or K2) value smaller than )

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

[0085] [CA / DC Related]

[0086] FIG. 4 is a diagram illustrating the wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, dual connectivity situation according to one embodiment of the present disclosure.

[0087] Referring to Fig. 4, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (Service Data Adaptation Protocol S25, S70), NR PDCP (Packet Data Convergence Protocol S30, S65), NR RLC (Radio Link Control S35, S60), and NR MAC (Medium Access Control S40, S55) at the terminal and the NR base station, respectively.

[0088] The main functions of NR SDAP (S25, S70) may include some of the following functions.

[0089] - User data transfer function (transfer of user plane data)

[0090] - Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0091] - Marking QoS flow ID for uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0092] - Function to map reflective QoS flow to data bearers for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0093] Regarding the SDAP layer device, the terminal may receive a setting via an RRC message indicating whether to use the header of the SDAP layer device or the functions of the SDAP layer device for each PDCP layer device, bearer, or logical channel. If the SDAP header is set, the terminal may be instructed to update or reset the mapping information for the uplink and downlink QoS flows and data bearers to the NAS reflective QoS and AS reflective QoS 1-bit indicators of the SDAP header. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used for data processing priority, scheduling information, etc., to support smooth service.

[0094] The main functions of NR PDCP (S30, S65) may include some of the following functions.

[0095] - Header compression and decompression features (ROHC only)

[0096] - User data transfer function (Transfer of user data)

[0097] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0098] - Out-of-sequence delivery of upper layer PDUs

[0099] - Reordering function (PDCP PDU reordering for reception)

[0100] - Duplicate detection function (Duplicate detection of lower layer SDUs)

[0101] - Retransmission of PDCP SDUs

[0102] - Encryption and decryption functions (Ciphering and deciphering)

[0103] - Timer-based SDU discard in uplink.

[0104] In the above, the reordering function of the NR PDCP device refers to a function that reorders PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function that transmits data to an upper layer in the reordered order. Alternatively, the reordering function of the NR PDCP device may include a function that transmits immediately without considering the order, a function that records lost PDCP PDUs by reordering, a function that reports the status of lost PDCP PDUs to the transmitting side, and a function that requests retransmission of lost PDCP PDUs.

[0105] The main functions of NR RLC(S35, S60) may include some of the following functions.

[0106] - Data transfer function (Transfer of upper layer PDUs)

[0107] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0108] - Out-of-sequence delivery of upper layer PDUs

[0109] - ARQ function (Error Correction through ARQ)

[0110] - Concatenation, segmentation, and reassembly functions of RLC SDUs

[0111] - Re-segmentation function (Re-segmentation of RLC data PDUs)

[0112] - Reordering function (Reordering of RLC data PDUs)

[0113] - Duplicate detection

[0114] - Error detection function (Protocol error detection)

[0115] - RLC SDU discard function

[0116] RLC re-establishment function

[0117] In the above, the in-sequence delivery function of the NR RLC device refers to the function of delivering RLC SDUs received from a lower layer to an upper layer in order. The in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering the RLC SDUs when the original RLC SDU is received divided into multiple RLC SDUs, a function of rearranging the received RLC PDUs based on an RLC SN (sequence number) or PDCP SN (sequence number), a function of recording lost RLC PDUs by rearranging the order, a function of reporting the status of lost RLC PDUs to the transmitting side, and a function of requesting retransmission of lost RLC PDUs. The in-sequence delivery function of the NR RLC device may include a function to deliver only the RLC SDUs prior to the lost RLC SDU in order to the upper layer if there is a lost RLC SDU, or a function to deliver all RLC SDUs received before the timer started in order 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 to deliver all RLC SDUs received up to the present in order to the upper layer if a predetermined timer has expired even if there is a lost RLC SDU.In addition, the RLC PDUs described above may be processed in the order they are received (regardless of the order of sequence numbers, in the order of arrival) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, 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 NR RLC layer may not include a concatenation function, and this function may be performed by the NR MAC layer or replaced by the multiplexing function of the NR MAC layer.

[0118] In the above, the out-of-sequence delivery function of the NR RLC device refers to a function of delivering RLC SDUs received from a lower layer directly to an upper layer regardless of order. It may include a function of reassembling and delivering RLC SDUs when a single RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs and sorting the order to record the lost RLC PDUs.

[0119] The NR MAC (S40, S55) can be connected to multiple NR RLC layer devices configured in a terminal, and the main functions of the NR MAC may include some of the following functions.

[0120] - Mapping function (Mapping between logical channels and transport channels)

[0121] - Multiplexing and demultiplexing functions (Multiplexing / demultiplexing of MAC SDUs)

[0122] - Scheduling information reporting function

[0123] - HARQ function (Error correction through HARQ)

[0124] - Priority handling between logical channels of one UE

[0125] - Priority handling between UEs by means of dynamic scheduling

[0126] - MBMS service identification function

[0127] - Transport format selection function

[0128] - Padding

[0129] The NR PHY layer (S45, S50) can perform the operation of channel coding and modulating upper layer data, creating OFDM symbols and transmitting them to the wireless channel, or demodulating OFDM symbols received through the wireless channel and channel decoding them to transmit them to the upper layer.

[0130] The above wireless protocol structure may vary in detail depending on the carrier (or cell) operation method. For example, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure having a single structure for each layer, as shown in S00. On the other hand, when a base station transmits data to a terminal based on Carrier Aggregation (CA) using multiple carriers in a single TRP, the base station and the terminal use a protocol structure that has a single structure up to the RLC, as shown in S10, but multiplexes the PHY layer through the MAC layer. As another example, when a base station transmits data to a terminal based on Dual Connectivity (DC) using multiple carriers in multiple TRPs, the base station and the terminal use a protocol structure that has a single structure up to the RLC, as shown in S20, but multiplexes the PHY layer through the MAC layer.

[0131] [Regarding Terminal Capability Reporting]

[0132] In LTE and NR, a terminal can perform a procedure to report the capabilities supported by the terminal to the base station while connected to the serving base station. In the description below, this is referred to as a UE capability report.

[0133] A base station may transmit a UE capability enquiry message requesting capability reporting to a connected terminal. The message may include a request for terminal capability specific to the base station's RAT (radio access technology) type. The request for each RAT type may include information such as supported frequency band combinations. Furthermore, in the case of the UE capability enquiry message, multiple UE capabilities for each RAT type may be requested through a single RRC message container transmitted by the base station, or the base station may transmit the UE capability enquiry message, which includes the request for each RAT type, to the terminal multiple times. That is, the UE capability inquiry may be repeated multiple times within a single message, and the terminal may construct and report the corresponding UE capability information message multiple times. In next-generation mobile communication systems, UE capability requests can be made for NR, LTE, EN-DC (E-UTRA - NR dual connectivity), and MR-DC (Multi-RAT dual connectivity). Additionally, while the UE capability enquiry message is generally transmitted initially after the terminal connects with the base station, the base station may request it under any conditions when necessary.

[0134] In the above step, the terminal that receives a request for a UE capability report from the base station configures the terminal capability according to the RAT type and band information requested from the base station. The method by which the terminal configures the UE capability in the NR system is summarized below.

[0135] 1. If the terminal receives a list of LTE and / or NR bands from the base station via a UE capability request, the terminal configures a band combination (BC) for EN-DC and NR stand-alone (SA). That is, it constructs a candidate list of BCs for EN-DC and NR SA based on the bands requested from the base station via FreqBandList. Additionally, the bands have priority in the order listed in FreqBandList.

[0136] 2. If the base station requests a UE capability report by setting the “eutra-nr-only” flag or the “eutra” flag, the terminal completely removes NR SA BCs from the above-mentioned list of configured BC candidates. This operation may occur only when the LTE base station (eNB) requests the “eutra” capability.

[0137] 3. Subsequently, the terminal removes fallback BCs from the candidate list of BCs configured in the above step. Here, a fallback BC refers to a BC that can be obtained by removing a band corresponding to at least one SCell from any BC; this step can be omitted because the BC before removing the band corresponding to at least one SCell already covers the fallback BC. This step applies to MR-DC as well, meaning it applies to LTE bands. The BCs remaining after this step constitute the final "candidate BC list."

[0138] 4. The terminal selects the BCs to be reported by selecting BCs that match the requested RAT type from the final "Candidate BC List" above. In this step, the terminal constructs the supportedBandCombinationList in a predetermined order. That is, the terminal constructs the BCs and UE capabilities to be reported according to the pre-set order of rat-Type (nr -> eutra-nr -> eutra). Additionally, it constructs a featureSetCombination for the constructed supportedBandCombinationList and constructs a list of "Candidate Feature Set Combinations" from the Candidate BC List from which the list of fallback BCs (containing capabilities of the same or lower level) has been removed. The above "Candidate Feature Set Combinations" include feature set combinations for 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.

[0139] 5. Additionally, if the requested rat Type is eutra-nr and has an influence, featureSetCombinations is included in both the UE-MRDC-Capabilities and UE-NR-Capabilities containers. However, the NR feature set is included only in UE-NR-Capabilities.

[0140] After the terminal capability is configured, the terminal transmits a terminal capability information message containing the terminal capability to the base station. Based on the terminal capability received from the terminal, the base station subsequently performs appropriate scheduling and transmission / reception management for the terminal.

[0141] [Regarding Rate Matching / Puncturing]

[0142] In the following, the rate matching operation and puncturing operation will be described in detail.

[0143] When a time and frequency resource A intended to transmit an arbitrary symbol sequence A overlaps with an arbitrary time and frequency resource B, rate matching or puncturing operations may be considered as transmission and reception operations of channel A, taking into account the area resource C where resource A and resource B overlap. Specific operations may follow the details below.

[0144] Rate Matching Operation

[0145] - A base station may transmit a symbol sequence A to a terminal by mapping Channel A only to the remaining resource area, excluding Resource C which corresponds to the area overlapping with Resource B, from the entire Resource A. For example, if symbol sequence A consists of {Symbol #1, Symbol #2, Symbol #3, Symbol 4}, Resource A is {Resource #1, Resource #2, Resource #3, Resource #4}, and Resource B is {Resource #3, Resource #5}, the base station may sequentially map and send symbol sequence A to the remaining resources {Resource #1, Resource #2, Resource #4}, excluding {Resource #3} which corresponds to Resource C within Resource A. Consequently, the base station may transmit the symbol sequence {Symbol #1, Symbol #2, Symbol #3} by mapping it to {Resource #1, Resource #2, Resource #4}, respectively.

[0146] The terminal can determine Resource A and Resource B from scheduling information regarding Symbol Sequence A from the base station, and thereby determine Resource C, which is the area where Resource A and Resource B overlap. The terminal can receive Symbol Sequence A by assuming that Symbol Sequence A was transmitted by mapping it to the remaining area of ​​Resource A, excluding Resource C. For example, if Symbol Sequence A consists of {Symbol #1, Symbol #2, Symbol #3, Symbol 4}, Resource A is {Resource #1, Resource #2, Resource #3, Resource #4}, and Resource B is {Resource #3, Resource #5}, the terminal can receive Symbol Sequence A by assuming that it was sequentially mapped to the remaining resources {Resource #1, Resource #2, Resource #4}, excluding {Resource #3}, which corresponds to Resource C. Consequently, the terminal can perform a series of subsequent reception operations by assuming that Symbol Sequence {Symbol #1, Symbol #2, Symbol #3} was transmitted by mapping it to {Resource #1, Resource #2, Resource #4}, respectively.

[0147] Puncturing action

[0148] If there is a resource C corresponding to an area overlapping with resource B among all resources A to which the base station intends to transmit symbol sequence A to a terminal, the base station maps symbol sequence A to the entire resource A, but does not perform transmission in the resource area corresponding to resource C, and can perform transmission only in the remaining resource area of ​​resource A excluding resource C. For example, if symbol sequence A consists of {Symbol #1, Symbol #2, Symbol #3, Symbol #4}, resource A is {Resource #1, Resource #2, Resource #3, Resource #4}, and resource B is {Resource #3, Resource #5}, the base station can map symbol sequence A {Symbol #1, Symbol #2, Symbol #3, Symbol #4} to resource A {Resource #1, Resource #2, Resource #3, Resource #4} respectively, and can transmit only the symbol sequence {Symbol #1, Symbol #2, Symbol #4} corresponding to the remaining resources {Resource #1, Resource #2, Resource #4}, excluding {Resource #3} corresponding to resource C, and may not transmit {Symbol #3} mapped to {Resource #3} corresponding to resource C. Consequently, the base station can map and transmit the symbol sequence {Symbol #1, Symbol #2, Symbol #4} to {Resource #1, Resource #2, Resource #4} respectively.

[0149] The terminal can determine resources A and B from scheduling information for symbol sequence A from the base station, and thereby determine resource C, which is the area where resources A and B overlap. The terminal can receive symbol sequence A by assuming that symbol sequence A is mapped to the entire resource A, but is transmitted only in the remaining area of ​​resource A excluding resource C. For example, if symbol sequence A consists of {Symbol #1, Symbol #2, Symbol #3, Symbol #4}, resource A is {Resource #1, Resource #2, Resource #3, Resource #4}, and resource B is {Resource #3, Resource #5}, the terminal can assume that symbol sequence A {Symbol #1, Symbol #2, Symbol #3, Symbol #4} is 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 can receive by assuming that symbol sequence {Symbol #1, Symbol #2, Symbol #4} corresponding to the remaining resources {Resource #1, Resource #2, Resource #4}—excluding {Resource #3} corresponding to resource C—is mapped and transmitted. Consequently, the terminal can perform a subsequent series of receiving operations by assuming that the symbol sequence {Symbol #1, Symbol #2, Symbol #4} is transmitted and mapped to {Resource #1, Resource #2, Resource #4}, respectively.

[0150] 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 the adjustment of the signal size by considering the amount of resources available to transmit the signal. For example, rate matching of a data channel may mean that the data channel is mapped to a specific time and frequency resource range so that the data size is adjusted accordingly without transmission.

[0151] FIG. 5 is a diagram illustrating a method for a base station and a terminal to transmit and receive data by considering downlink data channels and rate matching resources.

[0152] FIG. 5 illustrates a downlink data channel (PDSCH, 501) and a rate matching resource (502). A base station may set one or more rate matching resources (502) to a terminal through upper layer signaling (e.g., RRC signaling). The rate matching resource (502) setting information may include time axis resource allocation information (503), frequency axis resource allocation information (504), and period information (505). In the following, the bitmap corresponding to the frequency axis resource allocation information (504) is named the 'first bitmap', the bitmap corresponding to the time axis resource allocation information (503) is named the 'second bitmap', and the bitmap corresponding to the period information (505) is named the 'third bitmap'. If all or part of the time and frequency resources of a scheduled data channel (501) overlap with a set rate matching resource (502), the base station can transmit the data channel (501) by rate matching it in the portion of the rate matching resource (502), and the terminal can perform reception and decoding after assuming that the data channel (501) is rate matched in the portion of the rate matching resource (502).

[0153] The base station can dynamically notify the terminal via DCI whether to rate match a data channel in the above-mentioned rate matching resource portion through additional settings (corresponding to the 'rate matching indicator' within the aforementioned DCI format). Specifically, the base station can select some of the above-mentioned rate matching resources and group them into rate matching resource groups, and can indicate to the terminal via DCI using a bitmap method whether to rate match a data channel for each rate matching resource group. For example, if four rate matching resources, RMR(rate matching resource)#1, RMR#2, RMR#3, and RMR#4, are set, the base station can set RMG(rate matching group)#1 = {RMR#1, RMR#2} and RMG#2 = {RMR#3, RMR#4} as rate matching groups, and can indicate to the terminal via a bitmap whether to rate match in RMG#1 and RMG#2, respectively, using 2 bits within the DCI field. For example, you can indicate "1" when rate matching is required and "0" when rate matching is not required.

[0154] In 5G, the granularity of "RB symbol level" and "RE level" is supported by setting the aforementioned rate matching resources to the terminal. More specifically, the following setting method may be followed.

[0155] RB symbol level

[0156] The terminal can receive up to four RateMatchPatterns as upper layer signaling for each bandwidth portion, and one RateMatchPattern may include the following contents.

[0157] - As a Reserved Resource within the bandwidth portion, a resource may be included in which the time and frequency resource domains of the said Reserved Resource are set as a combination of an RB level bitmap and a symbol level bitmap along the frequency axis. The said Reserved Resource may span across one or two slots. A time domain pattern (periodicityAndPattern) in which the time and frequency domains composed of each RB level and symbol level bitmap pair are repeated may be additionally set.

[0158] - It may include time and frequency domain resource areas set as control resource sets within the bandwidth portion, and resource areas corresponding to time domain patterns set as search space settings where resource areas are repeated.

[0159] RE symbol level

[0160] The terminal can receive the following content through upper-layer signaling.

[0161] - Configuration information for an RE corresponding to an LTE CRS (Cell-specific Reference Signal or Common Reference Signal) pattern (lte-CRS-ToMatchAround) may include the number of ports of the LTE CRS (nrofCRS-Ports) and the LTE-CRS-vshift(s) value (v-shift), information on the location of the LTE carrier's center subcarrier (carrierFreqDL) from a reference frequency point (e.g., reference point A), information on the LTE carrier's bandwidth (carrierBandwidthDL), and subframe configuration information corresponding to a Multiast-broadcast single-frequency network (mbsfn-SubFrameConfigList). Based on the aforementioned information, the terminal can determine the location of the CRS within an NR slot corresponding to an LTE subframe.

[0162] - It may include configuration information for resource sets corresponding to one or more ZP (zero-power) CSI-RS within the bandwidth portion.

[0163] [Regarding LTE CRS rate match]

[0164] Next, the rate match process for the LTE CRS described above will be explained in detail. For LTE and NR coexistence, NR provides a function to set the pattern of the LTE CRS (Cell Specific Reference Signal) to the NR terminal. More specifically, the CRS pattern may be provided by RRC signaling that includes at least one parameter within the ServingCellConfig IE (Information Element) or ServingCellConfigCommon IE. Examples of the above parameters may include lte-CRS-ToMatchAround, lte-CRS-PatternList-r16, lte-CRS-PatternList2-r16, crs-RateMatch-PerCORESETPoolIndex-r16, etc.

[0165] In Rel-15 NR, the lte-CRS-ToMatchAround parameter provides the ability to set one CRS pattern per serving cell. In Rel-16 NR, this ability has been extended to allow multiple CRS patterns to be set per serving cell. More specifically, for a Single-TRP (transmission and reception point) configured terminal, one CRS pattern can be set per LTE carrier, and for a Multi-TRP configured terminal, two CRS patterns can be set per LTE carrier. For example, for a Single-TRP configured terminal, up to three CRS patterns per serving cell can be set through the lte-CRS-PatternList-r16 parameter. As another example, for a multi-TRP configured terminal, CRS can be set per TRP. In other words, the CRS pattern for TRP1 is set via the lte-CRS-PatternList-r16 parameter, and the CRS pattern for TRP2 can be set via the lte-CRS-PatternList2-r16 parameter. Meanwhile, when two TRPs are configured as described above, whether to apply the CRS patterns of both TRP1 and TRP2 to a specific PDSCH, or to apply the CRS pattern of only one TRP, is determined via the crs-RateMatch-PerCORESETPoolIndex-r16 parameter; if the crs-RateMatch-PerCORESETPoolIndex-r16 parameter is set to enabled, the CRS pattern of only one TRP is applied, and otherwise, the CRS patterns of both TRPs are applied.

[0166] [Table 4] shows a ServingCellConfig IE including the above CRS pattern, and [Table 5] shows a RateMatchPatternLTE-CRS IE including at least one parameter for the CRS pattern.

[0167] [Table 4]

[0168]

[0169]

[0170] [Table 5]

[0171]

[0172] [PDCCH: DCI related]

[0173] Next, we will explain downlink control information (DCI) in 5G systems in detail.

[0174] In a 5G system, scheduling information for uplink data (or Physical Uplink Shared Channel (PUSCH)) or downlink data (or Physical Downlink Shared Channel (PDSCH)) is transmitted from the base station to the terminal via DCI. The terminal can monitor the fallback DCI format and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may consist of fixed fields selected between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0175] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after undergoing channel coding and modulation processes. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled into a Radio Network Temporary Identifier (RNTI) corresponding to the terminal's identity. Different RNTIs may be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, or random access responses. In other words, the RNTI is not transmitted explicitly but is included in the CRC calculation process. Upon receiving a DCI message transmitted over the PDCCH, the terminal checks the CRC using the assigned RNTI; if the CRC check result is correct, the terminal knows that the message has been transmitted to it.

[0176] For example, a DCI scheduling a PDSCH for System Information (SI) can be scrambled as SI-RNTI. A DCI scheduling a PDSCH for Random Access Response (RAR) messages can be scrambled as RA-RNTI. A DCI scheduling a PDSCH for Paging messages can be scrambled as P-RNTI. A DCI notifying a Slot Format Indicator (SFI) can be scrambled as SFI-RNTI. A DCI notifying Transmit Power Control (TPC) can be scrambled as TPC-RNTI. A DCI scheduling a terminal-specific PDSCH or PUSCH can be scrambled as C-RNTI.

[0177] DCI format 0_0 can be used as a countermeasure DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI may include, for example, the information in [Table 6] below.

[0178] [Table 6]

[0179]

[0180] DCI format 0_1 ​​can be used as a non-defense DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI may include, for example, the information in [Table 7] below.

[0181] [Table 7]

[0182]

[0183] DCI format 1_0 can be used as a countermeasure DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI may include, for example, the information in [Table 8] below.

[0184] [Table 8]

[0185]

[0186] DCI format 1_1 can be used as a non-defense DCI for scheduling PDSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI may include, for example, the information in [Table 9] below.

[0187] [Table 9]

[0188]

[0189] [PDCCH: CORESET, REG, CCE, Search Space]

[0190] In the following, the downlink control channel in a 5G communication system will be explained in more detail with reference to the drawings.

[0191] Figure 6 is a diagram illustrating an example of a control resource set (CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system.

[0192] FIG. 6 illustrates an example in which two control areas (control area #1 (601), control area #2 (602)) are set within a terminal bandwidth part (UE bandwidth part) (610) on the frequency axis and one slot (620) on the time axis. The control areas (601, 602) can be set in a specific frequency resource (603) within the entire terminal bandwidth part (610) on the frequency axis. On the time axis, they can be set with one or more OFDM symbols and can be defined as the control area length (Control Resource Set Duration, 604). Referring to the example illustrated in FIG. 6, control area #1 (601) is set to a control area length of 2 symbols, and control area #2 (602) is set to a control area length of 1 symbol.

[0193] The control domain in the aforementioned 5G can be configured by a base station to a terminal through upper-layer signaling (e.g., System Information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Configuring a control domain to a terminal means providing information such as the control domain identifier (Identity), the frequency location of the control domain, and the symbol length of the control domain. For example, it may include the information in [Table 10] below.

[0194] [Table 10]

[0195]

[0196] In [Table 10], the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with the DMRS transmitted in the corresponding control area.

[0197] Figure 7 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G.

[0198] According to FIG. 7, the basic unit of time and frequency resources constituting a control channel can be called a REG (Resource Element Group, 703), and the REG (703) can be defined as 1 OFDM symbol (701) on the time axis and 1 PRB (Physical Resource Block, 702) on the frequency axis, i.e., 12 subcarriers. A base station can concatenate REGs (703) to form a downlink control channel allocation unit.

[0199] As illustrated in FIG. 7, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 704), then 1 CCE (704) can be composed of multiple REGs (703). For example, the REG (703) illustrated in FIG. 7 can be composed of 12 REs, and if 1 CCE (704) is composed of 6 REGs (703), then 1 CCE (704) can be composed of 72 REs. When a downlink control area is established, the area can be composed of multiple CCEs (704), and a specific downlink control channel can be mapped to one or multiple CCEs (704) and transmitted according to the Aggregation Level (AL) within the control area. The CCEs (704) in the control area are distinguished by numbers, and the numbers of the CCEs (704) can be assigned according to a logical mapping method.

[0200] The basic unit of the downlink control channel, namely the REG (703) illustrated in FIG. 7, may include both the REs to which the DCI is mapped and the DMRS (705), which is a reference signal for decoding, to which the area is mapped. As shown in FIG. 7, three DMRS (705) may be transmitted within one REG (703). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the Aggregation Level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The terminal must detect the signal without knowing information about the downlink control channel, and a search space representing a set of CCEs is defined for blind decoding. A search space is a set of downlink control channel candidates consisting of CCEs that a terminal must attempt to decode at a given aggregation level, and since there are various aggregation levels that form a group of 1, 2, 4, 8, or 16 CCEs, a terminal may have multiple search spaces. A search space set can be defined as a set of search spaces at all configured aggregation levels.

[0201] Search spaces can be classified into common search spaces and UE-specific search spaces. A certain group of terminals or all terminals may examine the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling or paging messages regarding system information. For example, PDSCH scheduling allocation information for the transmission of SIBs containing cell operator information can be received by examining the common search space of the PDCCH. In the case of the common search space, since a certain group of terminals or all terminals must receive the PDCCH, it can be defined as a pre-arranged set of CCEs. Scheduling allocation information for a UE-specific PDSCH or PUSCH can be received by examining the UE-specific search space of the PDCCH. The UE-specific search space can be defined specifically as a function of the terminal's identity and various system parameters.

[0202] In 5G, parameters for the search space for a PDCCH can be configured from the base station to the terminal via upper-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station may configure the terminal the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the occasion for monitoring in slot-symbol units for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the control domain index to be monitored in the search space. For example, the information in [Table 11] below may be included.

[0203] [Table 11]

[0204]

[0205] According to the configuration information, the base station may set one or multiple sets of search spaces for the terminal. According to some embodiments, the base station may set search space set 1 and search space set 2 for the terminal, and may set DCI format A scrambled with X-RNTI in search space set 1 to be monitored in a common search space, and may set DCI format B scrambled with Y-RNTI in search space set 2 to be monitored in a terminal-specific search space.

[0206] According to the configuration information, one or more sets of search spaces may exist in a common search space or a terminal-specific search space. For example, Search Space Set #1 and Search Space Set #2 may be configured as a common search space, and Search Space Set #3 and Search Space Set #4 may be configured as a terminal-specific search space.

[0207] In the common search space, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the examples below.

[0208] 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

[0209] DCI format 2_0 with CRC scrambled by SFI-RNTI

[0210] DCI format 2_1 with CRC scrambled by INT-RNTI

[0211] DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0212] DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0213] In terminal-specific search spaces, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the examples below.

[0214] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0215] DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0216] The specified RNTIs may follow the definitions and uses below.

[0217] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH scheduling

[0218] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0219] CS-RNTI (Configured Scheduling RNTI): Used for semi-statically configured terminal-specific PDSCH scheduling.

[0220] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling during the random access phase

[0221] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0222] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0223] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is pucturing.

[0224] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0225] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0226] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power regulation commands to the SRS

[0227] The aforementioned specified DCI formats may follow the definitions in [Table 12] below.

[0228] [Table 12]

[0229]

[0230] In a 5G system, the search space of aggregation level L in the control domain p and search space set s can be expressed as Equation 1 below.

[0231] [Mathematical Formula 1]

[0232]

[0233] - : Lamination level

[0234] - : Carrier Index

[0235] - : Total number of CCEs existing within control domain p

[0236] - : Slot Index

[0237] - : Number of PDCCH candidates at assembly level L

[0238] - = 0, ..., : PDCCH candidate index of aggregation level L

[0239] - i = 0, ..., L -1

[0240] - , , , , ,

[0241] - : Terminal identifier

[0242] The value may be 0 for the common search space.

[0243] In the case of a terminal-specific search space, the value may correspond to a value that changes according to the terminal's identity (C-RNTI or ID set by the base station for the terminal) and the time index.

[0244] In 5G, as multiple sets of search spaces can be configured with different parameters (e.g., parameters in [Table 16]), the set of search space sets monitored by the terminal at each point in time may vary. For example, if search space set #1 is configured for an X-slot period and search space set #2 is configured for a Y-slot period and X and Y are different, the terminal may monitor both search space set #1 and search space set #2 in a specific slot, and monitor either search space set #1 or search space set #2 in a specific slot.

[0245] [PDSCH / PUSCH: Regarding Frequency Resource Allocation]

[0246] Next, Frequency Domain Resource Assignment (FDRA) for PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel) in NR will be explained.

[0247] FIG. 8 is a diagram illustrating an example of frequency axis resource allocation of PDSCH or PUSCH in a wireless communication system according to one embodiment of the present disclosure.

[0248] FIG. 8 is a diagram illustrating three frequency axis resource allocation methods that can be configured through the upper layer in an NR wireless communication system: FDRA type 0 (800), FDRA type 1 (805), and dynamic switch (810).

[0249] Referring to FIG. 8, if the terminal is configured to use only FDRA type 0 through upper layer signaling (800), some downlink control information (DCI) that schedules PDSCH or PUSCH to the terminal includes a bitmap consisting of NRBG bits. The conditions for this will be explained later. In this case, NRBG refers to the number of RBGs (resource block groups) determined as shown in [Table 13] below according to the size of the bandwidth portion allocated by the bandwidth portion indicator and the upper layer parameter rbg-Size, and data is transmitted to the RBG indicated as 1 by the bitmap.

[0250] [Table 13]

[0251]

[0252] The size of the frequency resource in the bandwidth portion can be defined by the number of RBs included in the bandwidth portion. More specifically, if a terminal is instructed to allocate an FDRA type-0 resource, the length of the FDRA field of the DCI received by the terminal is equal to the number of RBGs (NRBG) within the bandwidth portion, and is. Here, the first RBG within the bandwidth portion is It includes RBs, and the last RBG within the bandwidth portion is If, Includes RBs, and otherwise, It includes RBs. The remaining RBGs within the bandwidth portion include P RBs. Here, P is the number of nominal RBGs determined according to [Table 13] above.

[0253] If the terminal is configured to use only FDRA type 1 through upper layer signaling (805), the DCI that assigns PDSCH or PUSCH to the terminal is It includes frequency domain resource allocation information (FDRA) consisting of bits. Here, is the number of RBs included in the bandwidth portion. Through this, the base station can set the starting VRB (820) and the length (825) of the frequency axis resources continuously allocated from it.

[0254] If the terminal does not receive the upper layer signaling vrb-ToPRB-Interleaver, the terminal can connect resources allocated to the VRB to the PRB without interleaving. If the terminal receives the upper layer signaling vrb-ToPRB-Interleaver, the upper layer signaling has a value of 2 or 4, and this value can be a unit of multiple RBs performing interleaving. That is, RB bundles of 2 or 4 units can be used for interleaving.

[0255] If the terminal Starting from the position and the length The i-th BWP consisting of RBs was configured, and the above vrb-ToPRB-Interleaver If set to , the terminal [is] the i-th BWP It can be divided into RB bundles, and each RB bundle is It can be made up of RBs.

[0256] In the i-th BWP, the first RB bundle is It can be made up of RBs.

[0257] In the i-th BWP, the last RB bundle is if When the value is greater than 0 It can consist of RBs, and if not, It can be made up of RBs.

[0258] In the i-th BWP, the remaining RB bundle is It can be made up of RBs.

[0259] At this time, VRB can be connected to PRB according to the following method.

[0260] The last VRB bundle can be connected to the last PRB bundle.

[0261] jth (j = 0, 1, ..., The VRB bundle is It can be connected to the nth PRB bundle, and It can be expressed as shown in [Mathematical Formula 2] below.

[0262] [Mathematical Formula 2]

[0263]

[0264]

[0265]

[0266]

[0267]

[0268]

[0269] FIG. 9 is a diagram showing the VRB-PRB interleaving method of PDSCH during FDRA type-1 resource allocation according to one embodiment of the present disclosure.

[0270] FIG. 9 shows the case (910) where the first and last VRB bundles within a BWP (900) consisting of 10 RBs consist of 1 VRB. Therefore, the number of VRB bundles is can be 6, and according to the above [Equation 2] It can be calculated as follows. Therefore, since the j-th VRB bundle can be connected to the f(j)-th PRB bundle by [Equation 2] above, the connection from the VRB bundle to the PRB bundle can be performed as in (920) through the result (930) calculated by [Equation 2] above. For example, VRB bundle 1 (940) can be connected to PRB bundle 3 (950).

[0271] If the terminal is configured to use both FDRA type-0 resource allocation and FDRA type-1 resource allocation through upper layer signaling (810), some DCIs that allocate PDSCH / PUSCH to the terminal include frequency axis resource allocation information consisting of bits of the larger value (835) of the payload (815) for setting FDRA type-0 resource allocation and the payload (820, 825) for setting FDRA type-1 resource allocation. The conditions for this will be explained later. At this time, one bit may be added to the first part (MSB) of the frequency axis resource allocation information within the DCI, and if the bit has a value of '0', it indicates that FDRA type-0 resource allocation is used, and if it has a value of '1', it indicates that FDRA type-1 resource allocation is used.

[0272] If the terminal has received an FDRA type-2 resource allocation method through upper layer signaling, the terminal may receive instructions from the base station regarding FDRA type-2 resource allocation according to the following method.

[0273] The terminal can be instructed to M sets of interlace indices through RB allocation information from the base station.

[0274] Interlaced index It can be composed of common RB {m, M+m, 2M+m, 3M+m, ...}, and M can be defined as in [Table 14].

[0275] [Table 14]

[0276]

[0277] RB in interlaced m and bandwidth portion i and common RB The relationship with can be defined as follows.

[0278] -

[0279] - where is the common resource block where bandwidth part starts relative to common resource block 0. u is subcairre spacing index

[0280] When the subcarrier spacing is 15 kHz (u=0), RB allocation information for an interlaced set can be notified from the base station to the terminal using m0 + l indices. Additionally, the resource allocation field can be composed of a Resource Inclusion Value (RIV). The Resource Inclusion Value , When, the starting interlace m0 and consecutive interlace numbers It can be composed of, and the value is as follows.

[0281] -

[0282] ■

[0283] - else

[0284] ■

[0285] The resource indicator value When that, the resource indicator value consists of the start interlaced index m0 and l values ​​and can be configured as shown in [Table 15].

[0286] [Table 15]

[0287]

[0288] When the subcarrier spacing is 30 kHz (u=1), RB allocation information can be notified from the base station to the terminal in the form of a bitmap indicating the interlaces allocated to the terminal. The size of the bitmap is M, and each bit of the bitmap corresponds to an interlace. The order of the interlace bitmap can be mapped from the MSB to the LSB from interlace index 0 to M-1.

[0289] In addition, the least significant bit (LSB) of the FDRA field for 15kHz and 30kHz can represent a consecutive set of RBs of PUSCH scheduled in DCI format 0_1. The Y bit can be composed of a resource indication value (RIVRBset). , In this case, the RIVRBset value is the starting RB set ( ) and the number of consecutive RB sets ( It can be determined as ). The RIVRBset value can be defined as follows.

[0290]

[0291] represents the number of RB sets included within the bandwidth portion, and can be determined by the number of guard gaps (or bands) within the carrier set to upper signaling (or pre-set).

[0292] [PDSCH / PUSCH: Time Resource Allocation]

[0293] The following describes a time-domain resource allocation method for data channels in next-generation mobile communication systems (5G or NR systems).

[0294] The base station may set a table for time domain resource allocation information for the downlink data channel (PDSCH) and uplink data channel (PUSCH) for the terminal using upper layer signaling (e.g., RRC signaling). For PDSCH, a table consisting of a maximum of maxNrofDL-Allocations = 16 entries may be set, and for PUSCH, a table consisting of a maximum of maxNrofUL-Allocations = 16 entries may be set. In one embodiment, the time domain resource allocation information may include PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0), PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information regarding the position and length of the start symbol for which the PDSCH or PUSCH is scheduled within the slot, and the mapping type of the PDSCH or PUSCH. For example, information such as [Table 16] or [Table 17] below may be transmitted from the base station to the terminal.

[0295] [Table 16]

[0296]

[0297] [Table 17]

[0298]

[0299] The base station may notify the terminal of one of the entries in the table for the time domain resource allocation information described above via L1 signaling (e.g., DCI) (e.g., indicated by the 'time domain resource allocation' field within the DCI). The terminal may obtain time domain resource allocation information for PDSCH or PUSCH based on the DCI received from the base station.

[0300] FIG. 10 is a diagram illustrating an example of time axis resource allocation of PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0301] Referring to FIG. 10, the base station uses the upper layer to set the subcarrier spacing (SCS) (μ) of the data channel and control channel. PDSCH , μ PDCCH The time axis position of the PDSCH resource can be indicated according to the scheduling offset (K0) value, and the OFDM symbol start position (1000) and length (1005) within one slot that are dynamically indicated through DCI.

[0302] [PDSCH: SPS related]

[0303] The operation of semi-persistent scheduling (SPS) can be explained below. If a terminal can operate two or more active DL SPS operations in a cell or BWP, the base station may set two or more DL SPS configurations for the terminal. The reason for supporting two or more DL SPS configurations is that when a terminal supports various types of traffic, different MCS, time / frequency resource allocations, or cycles may differ for each type of traffic, so it may be advantageous to set DL SPS configurations suitable for each purpose.

[0304] The terminal can receive at least one of the upper layer configuration information for DL ​​SPS as shown in the following [Table 18].

[0305] [Table 18]

[0306]

[0307] Among the above upper layer configuration information, the SPS index can be utilized for the purpose of indicating which SPS is indicated by the DCI (L1 signaling) that provides SPS activation or deactivation. Specifically, in a situation where two SPSs are configured as upper signals in a cell / one BWP, the terminal may need index information that informs the SPS upper information to determine which of the two SPSs the DCI instructing to activate SPS indicates activation. For example, the terminal can enable activation or deactivation by having the HARQ process number field within the DCI instructing to activate or deactivate SPS point to the index of a specific SPS. Specifically, as shown in [Table 19], if a DCI containing a CRC scrambled with CG-RNTI contains the following information and the NDI (new data indicator) field of the corresponding DCI indicates 0, the terminal can determine that it indicates the release (deactivation) of a specific SPS that is already activated.

[0308] [Table 19]

[0309]

[0310] In the above [Table 19], it is possible for a single HARQ process number to indicate a single SPS index or multiple SPS indices. It is also possible to indicate one or multiple SPS index(s) by other DCI fields (time resource field, frequency resource field, MCS, RV, PDSCH-to-HARQ timing field, etc.) in addition to the above HARQ process number field. Basically, a single SPS can be enabled or disabled by a single DCI. The location of the type 1 HARQ-ACK codebook for HARQ-ACK information for the DCI indicating the SPS PDSCH release may be the same as the location of the type 1 HARQ-ACK codebook corresponding to the reception location of the corresponding SPS PDSCH. If the location of the HARQ-ACK codebook corresponding to the candidate SPS PDSCH reception within the slot is k1, the location of the HARQ-ACK codebook for the DCI indicating the release of the corresponding SPS PDSCH may also be k1. Therefore, when a DCI instructing an SPS PDSCH release is transmitted in slot k, the terminal will not expect to receive a PDSCH corresponding to HARQ-ACK codebook position k1 scheduled in the same slot k, and if such a situation occurs, the terminal may consider it an error case. Although [Table 19] above uses DCI formats 0_0 and 1_0 as examples, it is applicable to DCI formats 0_1 and 1_1, and can be sufficiently extended and applied to other DCI formats 0_x and 1_x. Through the operation described above, the terminal receives SPS PDSCH upper layer signaling and a DCI instructing an SPS PDSCH activation, thereby allowing one or more SPS PDSCHs to operate simultaneously within one cell / one BWP.Subsequently, the terminal can periodically receive the activated SPS PDSCH within a cell / one BWP and transmit the corresponding HARQ-ACK information. The terminal can determine the HARQ-ACK information corresponding to the SPS PDSCH by using the slot interval information and the n1PUCCH-AN information included in the SPS upper configuration information, based on the PDSCH-to-HARQ-ACK timing included in the activated DCI information, to identify the exact time and frequency information and PUCCH format information within the corresponding slot. If the PDSCH-to-HARQ-ACK timing field included in the DCI information is missing, the terminal can assume a value previously set as the upper signal as the default value and determine that the value has been applied.

[0311] Alternatively, the terminal can set the next DL SPS setting information from the upper signal.

[0312] - Periodicity: DL SPS transmission period

[0313] - nrofHARQ-Processes: Number of HARQ processes configured for DL ​​SPS

[0314] - n1PUCCH-AN: HARQ resource configuration information for DL ​​SPS

[0315] - mcs-Table: MCS table configuration information applied to DL SPS

[0316] In the present disclosure, DL SPS setting information can be set for each Pcell or Scell, and can also be set for each frequency band part (BWP, Bandwidth Part). In addition, it may be possible to set one or more DL SPS for each specific cell and BWP.

[0317] The terminal can determine grant-free transmission and reception configuration information by receiving a higher signal for the DL SPS. The DL SPS may be able to transmit and receive data in resource areas configured after receiving a DCI instructing activation, but cannot transmit and receive data in resource areas prior to receiving the said DCI. Additionally, the terminal cannot receive data in resource areas prior to receiving a DCI instructing release.

[0318] The terminal can verify the DL SPS assignment PDCCH for SPS scheduling activation or release if both of the following two conditions are satisfied.

[0319] - Condition 1: When the CRC bits in DCI format transmitted from the above PDCCH are scrambled into the CS-RNTI set as the upper signaling

[0320] - Condition 2: When the NDI field for the active transmission block is set to 0

[0321] If some of the fields constituting the DCI format transmitted to the above DL SPS assignment PDCCH are identical to those presented in [Table 20] or [Table 21], the terminal may determine that the information within the DCI format is a valid activation or a valid release of the DL SPS. For example, if the terminal detects a DCI format containing information presented in [Table 20], the terminal may determine that the DL SPS has been activated. As another example, if the terminal detects a DCI format containing information presented in [Table 21], the terminal may determine that the DL SPS has been released.

[0322] If some of the fields constituting the DCI format transmitted to the above DL SPS assignment PDCCH are not identical to those presented in [Table 20] (special field configuration information for activating DL SPS) or [Table 21] (special field configuration information for releasing DL SPS), the terminal may determine that the above DCI format has been detected as a non-matching CRC.

[0323] [Table 20]

[0324]

[0325] [Table 21]

[0326]

[0327] When a terminal receives a PDSCH without receiving a PDCCH, or receives a PDCCH indicating an SPS PDSCH release, it may generate a corresponding HARQ-ACK information bit. Additionally, at least in Rel-15 NR, the terminal may not be expected to transmit HARQ-ACK information(s) for receiving two or more SPS PDSCHs to a single PUCCH resource. In other words, at least in Rel-15 NR, the terminal may include only HARQ-ACK information for receiving one SPS PDSCH to a single PUCCH resource.

[0328] DL SPS can be configured in PCell (primary cell) and SCell (secondary cell) as well. The parameters that can be configured as DL SPS upper-level signaling may be as follows.

[0329] - Periodicity: Transmission period of DL SPS

[0330] - nrofHARQ-processes: Number of HARQ processes that can be configured for DL ​​SPS

[0331] - n1PUCCH-AN: PUCCH HARQ resource for DL ​​SPS; base station sets the resource to PUCCH format 0 or 1.

[0332] The aforementioned [Tables 20] to [Table 21] may be fields available in situations where only one DL SPS can be set per cell and per BWP. In situations where multiple DL SPS are set per cell and per BWP, the DCI fields for enabling (or disabling) each DL SPS resource may differ. The present disclosure may provide a method to resolve such situations.

[0333] Not all DCI formats described in [Table 20] and [Table 21] in this disclosure may be used to enable or disable DL SPS resources, respectively. For example, DCI format 1_0 and DCI format 1_1 used to schedule PDSCH may be used to enable DL SPS resources. For example, DCI format 1_0 used to schedule PDSCH may be used to disable DL SPS resources.

[0334] [CP-OFDM]

[0335] The following describes CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing). CP-OFDM effectively reduces inter-symbol interference caused by multipath fading and facilitates the recovery and synchronization processes of received signals. This enhances the reliability of data transmission and enables support for high-speed data transmission in various wireless communication systems. A CP is generated by copying the end of an OFDM symbol and inserting it at the beginning of the symbol; the inserted CP absorbs ISI caused by multipath delay, thereby minimizing the impact on the received OFDM symbol. Additionally, the length of the CP may need to be set to be longer than the multipath delay spread. Therefore, OFDM symbols containing a CP minimize interference that may occur in a multipath environment and facilitate signal recovery and synchronization at the receiving end. The transmission process of CP-OFDM can be composed of the following procedures.

[0336] - Data Input: Data to be transmitted can be input. This data is a digital signal, for example, in the form of a bit stream.

[0337] - Serial-to-Parallel Conversion: An input serial data stream can be converted into a parallel data stream to map to each subcarrier of OFDM. The parallelized data can become the signal symbols to be assigned to each subcarrier.

[0338] - Modulation: Parallelized data streams can be modulated using digital modulation methods such as QAM (Quadrature Amplitude Modulation) or PSK (Phase Shift Keying). The modulated symbols represent data in the frequency domain, and each symbol can correspond to one subcarrier.

[0339] - IFFT (Inverse Fast Fourier Transform): Modulated subcarrier symbols can be transformed from the frequency domain to the time domain through the IFFT. The output of the IFFT can be an OFDM signal composed of multiple mutually orthogonal subcarriers.

[0340] - Cyclic Prefix Insertion: To prevent inter-symbol interference (ISI) caused by multipath fading, a portion of the end of an OFDM symbol can be copied and inserted at the beginning of the symbol. The length of the inserted CP must be set longer than the multipath delay spread, which can reduce interference that may occur when the transmitted signal is received.

[0341] - Parallel-to-Serial Conversion: An OFDM signal with a CP inserted can be converted from parallel data back into a serial data stream. This can be a preparatory process for transmission over a wireless channel via a transmitter.

[0342] - D / A Conversion and RF Transmission: Serialized signals can be converted into analog signals through digital-to-analog conversion (D / A Conversion). These analog signals can be transmitted over a wireless channel via a transmitting antenna after frequency modulation.

[0343] The reception process of CP-OFDM can be composed of the following procedures.

[0344] - RF Reception and A / D Conversion: The transmitted analog signal can be received by a receiving antenna. This signal can be converted into a digital signal through analog-to-digital conversion (A / D Conversion).

[0345] - Serial-to-Parallel Conversion: A received serial signal can be converted into a parallel data stream. This parallelized signal can be used for OFDM symbol recovery.

[0346] - Cyclic Prefix Removal: The CP can be removed from the received signal. The removed signal is restored to the original OFDM symbols, and the CP has already performed the role of mitigating signal interference.

[0347] - FFT (Fast Fourier Transform): A signal with CP removed can be transformed from the time domain to the frequency domain through the FFT. As the inverse process of the IFFT, the FFT can extract modulated symbols by recovering the frequency components of each subcarrier.

[0348] - Equalization: A channel equalization process is performed to correct distortion caused by the channel. In this process, the signal amplitude and phase are corrected based on channel state information to recover the original modulation symbols.

[0349] - Demodulation: The recovered symbols can be demodulated back into the original bit data. Depending on the QAM or PSK modulation scheme, each symbol can be converted into the corresponding bit data.

[0350] - Parallel-to-Serial Conversion: An unmodulated parallel data stream can be converted into a serial data stream. Through this process, the originally transmitted data bit stream can be recovered.

[0351] - Data Output: The recovered data is output, and this can match the original data input from the transmitting side.

[0352] [DFT-S-OFDM]

[0353] The following describes Discrete Fourier Transform Spread-OFDM (DFT-s-OFDM). Orthogonal Frequency Division Multiplexing (OFDM) is a method that transmits data in parallel using multiple subcarriers and can demonstrate robust performance against Frequency Selective Fading (FSE) and Inter-Symbol Interference (ISI). However, the OFDM method has the disadvantage of a high Peak-to-Average Power Ratio (PAPR). A high PAPR can induce non-linear distortion in power amplifiers, thereby degrading transmission efficiency. To address this, the DFT-s-OFDM method, which incorporates Discrete Fourier Transform Spreading (DFT Spreading), can be proposed. DFT-s-OFDM is a technology that can improve transmission efficiency by effectively reducing PAPR while maintaining the advantages of OFDM. DFT Spreading is a process that applies the Discrete Fourier Transform (DFT) to an input data sequence to transform it into the frequency domain. The DFT evenly spreads each symbol of the input data across all subcarriers, ensuring that each subcarrier possesses the same signal energy. This lowers the PAPR, thereby reducing non-linear distortion in power amplifiers and improving the quality of the transmitted signal. Subsequently, the DFT-spreaded data is mapped into multiple subcarriers via an OFDM modulator, and these mapped subcarriers can be transmitted in parallel while maintaining orthogonality. During this process, a Cyclic Prefix (CP) is inserted to enhance resistance to multipath fading.Through this, DFT-s-OFDM can effectively lower PAPR while maintaining the robust performance against frequency-selective fading and inter-symbol interference of OFDM. Lower PAPR increases the efficiency of power amplifiers and can contribute to extended battery life and improved signal quality. The transmission process of DFT-s-OFDM can be composed of the following procedures.

[0354] - Data Input: Digital data to be transmitted can be input. This data is typically in the form of a bit stream, and each bit may be ready to be converted into a symbol.

[0355] - Serial-to-Parallel Conversion: An input serial data stream can be converted into a parallel data stream. The parallelized data can become individual data blocks.

[0356] - Modulation: Parallel data streams can be modulated using digital modulation schemes such as Quadrature Amplitude Modulation (QAM) or Phase Shift Keying (PSK). The modulated symbols represent data in the frequency domain and can be prepared for transmission after passing through the DFT.

[0357] - DFT Spreading: Modulated symbols can be transformed from the frequency domain to the time domain through the Discrete Fourier Transform (DFT) operation. The DFT serves to distribute each modulated symbol across multiple subcarriers. In this process, each symbol is spread across multiple subcarriers, which can have the effect of lowering the signal's PAPR.

[0358] - Serial-to-Parallel Conversion and Subcarrier Mapping: The output of the DFT is converted into a parallel data stream, which can be mapped to each subcarrier of OFDM. Each DFT spreading symbol can be mapped to a given subcarrier to form an OFDM signal.

[0359] - IFFT (Inverse Fast Fourier Transform): Mapped subcarriers can be transformed into the time domain through the IFFT. The IFFT can combine all subcarriers to generate a single OFDM symbol. In this case, the OFDM symbol can be composed of multiple mutually orthogonal subcarriers.

[0360] - Insertion of Cyclic Prefix (CP): A cyclic prefix (CP) can be inserted into the generated OFDM symbol. The CP is created by copying the last part of the OFDM symbol and inserting it at the beginning of the symbol, which can prevent inter-symbol interference (ISI) caused by multipath fading.

[0361] - Parallel-to-Serial Conversion: OFDM symbols with inserted CPs can be converted from parallel data back into a serial data stream. This serial signal can then be prepared for transmission from the transmitter to the radio channel.

[0362] - D / A Conversion and RF Transmission: Serialized signals can be converted into analog signals through digital-to-analog conversion (D / A Conversion). The analog signals can be transmitted over a wireless channel via a transmitting antenna after frequency modulation.

[0363] - The reception process of DFT-s-OFDM can be composed of the following procedures.

[0364] - RF Reception and A / D Conversion: The receiving antenna accepts the transmitted analog signal. This signal can be converted into a digital signal through analog-to-digital conversion (A / D Conversion).

[0365] - Serial-to-Parallel Conversion: A received serial signal can be converted into a parallel data stream. This parallelized signal is a preparatory step for OFDM symbol recovery.

[0366] - Cyclic Prefix Removal: Cyclic prefixes (CPs) can be removed from the received signal. The signal with the CP removed can be restored to its original OFDM symbols. The CP is intended to prevent interference caused by multipath and can be removed during the reception process.

[0367] - FFT (Fast Fourier Transform): A signal with CP removed can be transformed from the time domain to the frequency domain through the FFT. The FFT can extract modulated symbols by recovering frequency components separated by subcarrier.

[0368] - Subcarrier Demapping and Parallel-to-Serial Conversion: Symbols recovered from each subcarrier can be restored back to the original parallel data stream. The recovered data can be prepared for conversion back to the original modulated symbols through DFT operations.

[0369] - IDFT Despreading: Recovered frequency domain data can be transformed back into the original time domain through the Inverse Discrete Fourier Transform (IDFT). The IDFT can recover the original modulation symbols by inversely transforming the DFT-spreaded data at the transmitting end.

[0370] - Demodulation: The recovered symbols can be demodulated and converted back into the original bit data. Each symbol can be converted into a corresponding bit stream using QAM or PSK modulation schemes.

[0371] - Parallel-to-Serial Conversion: An unmodulated parallel data stream can be converted into a serial data stream. This serial data can be restored to the originally transmitted +bit stream.

[0372] - Data Output: The recovered data is output, and this can match the original data input from the transmitting side.

[0373] [CP-OFDM vs. DTF-s-OFDM]

[0374] As explained earlier, CP-OFDM can be a method that adds a Cyclic Prefix (CP) to the OFDM method. OFDM is a method that transmits data simultaneously using multiple orthogonal subcarriers. In this case, each subcarrier may need to maintain orthogonality to prevent interference with one another. Accordingly, the following advantages and disadvantages are generally well known.

[0375] - Advantage 1: Can be robust against multipath interference. Cyclic prefixes (CPs) can play a significant role in mitigating multipath interference that may occur during signal transmission. This enables robust performance against frequency-selective fading of the channel.

[0376] - Advantage 2: Efficient use of frequency resources is possible. Frequency resources can be utilized efficiently by using orthogonal subcarriers.

[0377] - Advantage 3: The receiver structure can be simple. Since CP-OFDM can independently demodulate the signal of each subcarrier, the receiver structure can be relatively simple.

[0378] - Disadvantage 1: The peak-to-average power ratio (PAPR) can be high. One of the major disadvantages of CP-OFDM is that the peak-to-average power ratio (PAPR) can be high. This can lead to inefficiency in amplifier design.

[0379] - Disadvantage 2: Signal loss may occur due to multipath delay. If the length of CP is shorter than the multipath delay, signal loss may occur.

[0380] DFT-s-OFDM is a type of OFDM that first performs a Discrete Fourier Transform (DFT) on the data to be transmitted and then maps the result to the OFDM subcarrier. This method may have been proposed to address the high PAPR problem of CP-OFDM. DFT-s-OFDM may also be referred to as SC-FDMA (Single Carrier Frequency Division Multiple Access). The following advantages and disadvantages are generally known.

[0381] - Advantage 1: PAPR can be low. By spreading data through DFT, a lower PAPR compared to CP-OFDM can be provided. This can increase power efficiency and create favorable conditions for amplifier design.

[0382] - Advantage 2: Can have single-carrier characteristics. Unlike CP-OFDM, DFT-s-OFDM maintains single-carrier characteristics, so it can perform better with respect to frequency-selective fading.

[0383] - Advantage 3: It can demodulate in the same way as OFDM, while providing the flexibility to apply various modulation schemes. Therefore, it can support modem designs with a structure similar to OFDM.

[0384] - Disadvantage 1: Transceiver design complexity may increase. The design of the receiver may become complex due to the DFT process and additional processing. In addition, this may increase the computational load of the transceiver by adding DFT and Inverse DFT (IDFT) operations.

[0385] - Disadvantage 2: In certain channel situations, DFT-s-OFDM may be inefficient in terms of frequency resource utilization compared to CP-OFDM.

[0386] CP-OFDM has a simple structure and is robust against multipath interference, but it can suffer from high PAPR issues. DFT-s-OFDM has a low PAPR, offers good power efficiency, and can maintain single-carrier characteristics, but it involves increased computational complexity and may be disadvantageous in terms of efficiency under certain circumstances.

[0387] FIG. 11 is a transmission block diagram according to one embodiment of the present disclosure.

[0388] Referring to FIG. 11, first, the Transform precoding (1110) is applied exclusively to DFT-S-OFDM, and subsequently, the Sub-carrier mapping (1120), IFFT (1130), and CP insertion (1140) can be applied commonly to both DFT-S-OFDM and CP OFDM. Therefore, since all processes except the Transform precoding step (1110) are identical, it can be easier to implement the modem. Additionally, in the case of DFT-S-OFDM, the design complexity may increase compared to CP OFDM because the Transform precoding step (1110) is added.

[0389] [OTFS]

[0390] The following describes OTFS (Orthogonal Time Frequency Space). In existing wireless communication systems, frequency domain modulation schemes such as OFDM (Orthogonal Frequency Division Multiplexing) have been widely used. However, OFDM may have the disadvantage of performance degradation in environments with severe time-frequency fluctuations, such as multipath fading. In particular, in high-speed mobile environments, interference in the frequency domain increases due to the Doppler effect, which can significantly degrade communication quality. OTFS is a modulation scheme proposed to address these issues, allowing data to be modulated and transmitted in the time-Doppler domain rather than the time-frequency domain. Through this, it demonstrates robust performance against multipath fading and Doppler effects, enabling more stable data transmission. Modulation in the time-Doppler domain means that input data can be converted into the time-Doppler domain. To achieve this, a 2D transformation technique can be applied to convert a signal from the time-frequency domain into the time-Doppler domain. Subsequently, the transformed data can be modulated in the time-Doppler domain. OTFS transmits each signal by mapping it to a combination of Doppler frequency and delay time, which enables transmission that is more robust against multipath and Doppler effects. This allows for strong resistance to multipath fading. Since OTFS is designed so that the transmitted signal is dispersed in the time-Doppler domain, interference caused by multipath is dispersed and can be effectively recovered at the receiver. Furthermore, because OTFS naturally handles frequency shifts caused by Doppler effects in the time-Doppler domain, it can guarantee stable communication even in high-speed mobile environments. Additionally, the receiver can demodulate the received signal in the time-Doppler domain and then inversely transform it back into the time-frequency domain.Through this process, the original data can be accurately recovered. By doing so, OTFS performs channel equalization in the time-Doppler domain, effectively compensating for channel variability. Consequently, the OTFS system can provide excellent performance even in environments with severe multipath and Doppler effects; in particular, communication performance is significantly improved in high-speed mobile environments or urban areas, and it can be usefully applied in applications such as vehicle-to-vehicle (V2X) and satellite communication. The transmission process of OTFS can be composed of the following procedures.

[0391] - Data Input: Digital data to be transmitted can be input. This data is typically in the form of a bit stream, and each bit may be ready to be converted into a symbol.

[0392] - Serial-to-Parallel Conversion: An input serial data stream can be converted into a parallel data stream. This parallel data can be prepared for the time-Doppler domain mapping of the OTFS.

[0393] - Modulation: Parallel data streams can be modulated using digital modulation schemes such as Quadrature Amplitude Modulation (QAM) or Phase Shift Keying (PSK). The modulated symbols represent data in the frequency domain. In OTFS, these modulated symbols can be prepared to be mapped to the time-Doppler domain.

[0394] - 2D Transformation - Mapping to the Time-Doppler Domain: Modulated symbols can be mapped to the time-Doppler domain through 2D transformation. This transformation involves converting the signal from the time-frequency domain to the time-Doppler domain, and for this purpose, the Separated Fourier Transform (SFFT) or other 2D transformation techniques may be used. During this mapping process, symbols are placed at various combinations of delay times and Doppler frequencies, which can increase robustness against multipath and Doppler effects.

[0395] - Sampling after domain transformation: A signal mapped in the time-Doppler domain can be transformed back into the time-frequency domain. At this point, the signal can be transformed into the time domain through the Inverse Fast Fourier Transform (IFFT). The transformed signal consists of OTFS symbols and can then be prepared for transmission in the time domain.

[0396] - Cyclic Prefix (CP) Insertion: A cyclic prefix (CP) can be inserted into OTFS symbols generated in the time domain. As with OFDM, CP can be used to prevent multipath fading and inter-symbol interference (ISI).

[0397] - Parallel-to-Serial Conversion: An OTFS signal with a CP inserted can be converted from parallel data to a serial data stream. The serialized signal can be prepared for transmission over a wireless channel through a transmitter.

[0398] - D / A Conversion and RF Transmission: Serialized signals can be converted into analog signals through digital-to-analog conversion (D / A Conversion). The analog signals can be transmitted over a wireless channel via a transmitting antenna after frequency modulation.

[0399] The OTFS reception process can be composed of the following procedures.

[0400] - RF Reception and A / D Conversion: The receiving antenna accepts the transmitted analog signal. This signal can be converted into a digital signal through analog-to-digital conversion (A / D Conversion).

[0401] - Serial-to-Parallel Conversion: A received serial signal can be converted into a parallel data stream. This parallelized signal is a preparatory process for recovering OTFS symbols.

[0402] - Cyclic Prefix Removal: Cyclic prefixes (CPs) can be removed from the received signal. The signal with the CP removed can be restored to its original OTFS symbols. The CP has already played a role in reducing interference caused by multipath during the reception process.

[0403] - Time-Frequency Domain Transformation: A signal with CP removed can be transformed into the time-frequency domain. This transformation can be performed using tools such as the Fast Fourier Transform (FFT). In this process, the received signal can be converted into data sampled in the frequency domain.

[0404] - 2D Transformation - Transformation to Time-Doppler Domain: A signal transformed in the time-frequency domain can be transformed back into the time-Doppler domain. Through this transformation, the received signal is mapped to the original Doppler frequency and delay time, which allows for accurate compensation of multipath and Doppler effects.

[0405] - Demodulation: Data recovered in the time-Doppler domain can be converted back into the original bit data through a demodulation process. Using QAM or PSK modulation schemes, each symbol can be converted into a corresponding bit stream.

[0406] - Parallel-to-Serial Conversion: An unmodulated parallel data stream can be converted into a serial data stream. This serial data can be restored to the originally transmitted bit stream.

[0407] - Data Output: The recovered data is output, and this can match the original data input from the transmitting side.

[0408] The following describes the concept of downlink channel / signal overlap with different waveforms.

[0409] The CP-OFDM, DFT-S-OFDM, and OTFS described above can be considered as waveforms capable of providing optimal performance in specific environments. For example, this applies to supporting CP-OFDM and DFT-S-OFDM for uplink transmission in LTE and 5G NR. In next-generation communication systems, it may be possible to support one or more waveforms for downlink transmission as well as uplink transmission. In this context, a method for handling overlapping between downlink signals can be described.

[0410] In a next-generation communication system, a terminal may report its supported downlink waveform capability to a base station. As mentioned above, the waveform type may include at least one of CP-OFDM, DFT-s-OFDM, or OTFS. The terminal may report to the base station information regarding whether it supports at least one of the waveform types. Based on the waveform capability reported by the terminal, the base station may set and instruct the terminal, through at least one of upper-layer signaling, DCI transmitted to the terminal, or MAC-CE (medium access control-control element), which waveform to use for scheduling when scheduling downlink channels and / or signals. The terminal may receive downlink channels and / or signals based on the waveform set and instructed by the base station.

[0411] FIG. 12 is a diagram showing a downlink channel / signal scheduling situation within a slot according to one embodiment of the present disclosure.

[0412] Referring to FIG. 12(a), the terminal can receive instructions for a PDSCH scheduling area (1201) from the DCI format. Here, time domain allocation information for the PDSCH can be received through the TDRA (time domain resource allocation) field of the DCI format, and frequency domain allocation information can be received through the FDRA (frequency domain resource allocation) field of the DCI format. Alternatively, the terminal can receive a semi-persistent PDSCH transmission schedule from the base station through an upper layer signal. As described above, the terminal can receive instructions to enable / disable the SPS PDSCH from the DCI format, and can determine whether to receive or not receive the PDSCH in the preset time and frequency resources according to the instructions.

[0413] In addition to the above, referring to FIG. 12(b), a scheduled PDSCH transmission resource (1202) may overlap with another downlink channel or downlink signal transmission resource (1203). For example, the scheduled PDSCH transmission resource may overlap with a PDCCH (CORESET) transmission resource that needs to be monitored periodically / semi-permanently. For another example, the scheduled PDSCH transmission resource may overlap with a cell-specific broadcast channel or downlink signal that is transmitted periodically (e.g., SS / PBCH of NR). For yet another example, the scheduled PDSCH transmission resource may overlap with an LTE-CRS transmission resource that is transmitted periodically. For yet another example, the scheduled PDSCH transmission resource may overlap with an NZP (non-zero power)-CSI-RS or ZP-CSI-RS. As another example, a scheduled PDSCH transmission resource may overlap with an SPS PDSCH or other dynamically scheduled PDSCHs.

[0414] Meanwhile, the base station may support at least one waveform for the downlink channel and / or signal, and the terminal may also support at least one waveform for the downlink channel and / or signal. In this case, for the PDSCH transmission resource, the base station may set or instruct the terminal supporting multiple waveforms to a DFT-s-OFDM waveform to improve PAPR efficiency. On the other hand, for downlink channels or downlink signals transmitted periodically or semi-permanently (e.g., PDCCH(CORESET), SS / PBCH, CSI-RS, or LTE-CRS), the base station may set a CP-OFDM waveform for multiple interference and frequency resource efficiency.

[0415] At this time, referring to Fig. 12(b), downlink data channels or downlink signals with different waveforms may overlap some or all of the frequency resources at the same time. One method to resolve this is to perform rate matching or puncturing in both time and frequency resources. Through this, assuming different waveforms that are multiplexed (i.e., FDM) of frequency resources within the same time resource, frequency resource efficiency can be secured from the base station's perspective. However, from the terminal's perspective, implementation complexity may be required to distinguish different waveforms within the same time resource. In addition, there is a disadvantage that gain may be attenuated from the base station's perspective, even when utilizing DFT-s-OFDM to obtain a reduced PAPR effect.

[0416] Accordingly, embodiments of the present disclosure relate to a method for optimizing the use of each waveform when downlink channels or downlink signals with different waveforms set in a time resource overlap. In particular, a method for transmitting a single downlink channel or signal using a single waveform is described.

[0417] For convenience of explanation, the term 'downlink channel or downlink signal' below refers to a downlink channel or downlink signal with a waveform different from that of the PDSCH, and may be interpreted as such unless further explanation is provided. Additionally, the downlink channel or downlink signal may include at least periodic / semi-permanent / dynamic CSI-RS, PDCCH monitoring, LTE-CRS, SS / PBCH and / or SPS PDSCH reception, etc.

[0418] The concept of such overlap may be applied to the operation of the terminal and base station of the present disclosure described below. Additionally, overlap (in the case of overlap, when overlap occurs) may be defined as the overlap of all or at least part in the time domain and the frequency domain.

[0419] The following describes the symbol level rate matching method for PDSCH transmission and reception.

[0420] As explained above, for a PDSCH transmission resource, when it overlaps with a downlink channel or downlink signal set with a waveform different from the waveform set in the PDSCH, the PDSCH transmission resource can perform rate matching for the number of overlapping symbol resources.

[0421] FIG. 13 is a diagram showing PDSCH transmission resource symbol level rate matching when different waveforms are superimposed according to one embodiment of the present disclosure.

[0422] According to FIG. 13, a base station may schedule a PDSCH (1301) to a terminal based on at least one waveform among DFT-s-OFDM, CP-OFDM, or OTFS. At this time, the scheduled PDSCH may overlap with a downlink channel or downlink signal (1302) that is transmitted with a waveform different from the waveform set for the PDSCH. At this time, the base station may transmit a PDSCH (1305) by rate-matching the scheduled PDSCH resource by the number of overlapped symbols (1304). In addition, the terminal may also receive the PDSCH (1305) by assuming the resource rate-matched by the number of overlapped symbols. The terminal may assume that the PDSCH is not transmitted from the resource (1303) rate-matched by the number of overlapped symbols. The method for determining the overlapped symbols and determining, setting, or instructing the symbol-level rate-matching pattern will be described in detail below.

[0423] On the other hand, the base station may not perform a separate PDSCH transmission to the terminal for the rate-matched resource (1303), but may schedule a downlink resource to another terminal for the remaining resource. The above description assumes that the scheduled PDSCH (1301) and a different downlink channel or downlink signal (1302) partially overlap in the frequency resource, and may not occur in a situation where they completely overlap.

[0424] Meanwhile, the method for determining / setting or indicating the number of symbols to perform the above rate matching may follow at least one of the following methods. For example, it may follow at least one of the methods 1, 2, and 3 below.

[0425] Method 1. Method for the terminal to determine the rate-matching pattern

[0426] The terminal can determine the start point and length of the overlapping symbol by comparing the time resources of the PDSCH with the time resources of a downlink channel or downlink signal in which a waveform different from the PDSCH is set.

[0427] FIGS. 14A, FIGS. 14B, and FIGS. 14C are drawings illustrating a method for a terminal to determine a rate-matching pattern according to an embodiment of the present disclosure.

[0428] Referring to FIG. 14A, when the downlink channel or downlink signal start symbol (1405) is smaller than the PDSCH time resource start symbol (1404) (when the downlink channel or downlink signal start symbol (1405) is faster in the time domain than the PDSCH time resource start symbol (1404)), the rate matching pattern (1408) can be calculated and determined through the following method.

[0429] - PDSCH time resource start symbol (1404) > Downlink channel or downlink signal start symbol (1405)

[0430] ■ The starting symbol of the symbol level rate-matching pattern (1408) is the starting symbol (1404) of the PDSCH, and the symbol length of the symbol level rate-matching pattern (1408) can be calculated as (symbol length of downlink channel or downlink signal (1407) - (PDSCH starting symbol (1404) - starting symbol of downlink channel or downlink signal (1405))). Based on this, the terminal can determine the starting point and length of the symbol of the symbol level rate-matching pattern (1408), and the terminal can receive the PDSCH after rate-matching based on the corresponding pattern (1408) in the PDSCH (1401) resource.

[0431] Referring to FIG. 14B, if the start symbol (1415) of the downlink channel or downlink signal is greater than or equal to the PDSCH time resource start symbol (1414) (if the start symbol (1415) of the downlink channel or downlink signal is later than or equal to the PDSCH time resource start symbol (1414) in the time domain), the rate matching pattern (1418) can be calculated and determined through the following method.

[0432] - PDSCH time resource start symbol (1414) <= downlink channel or downlink signal start symbol (1415)

[0433] At this time, the case where the end point (1417) of the downlink channel or downlink signal symbol is smaller than the end point (1416) of the PDSCH symbol can also be considered (i.e., when the time resources of the downlink channel or downlink signal are all included in the time resources of the PDSCH).

[0434] ■ PDSCH time resource symbol end point (1416) >= downlink channel or downlink signal symbol end point (1417)

[0435] ◆ The starting symbol of the symbol level rate-matching pattern (1418) is the starting symbol (1415) of the downlink channel or downlink signal, and the symbol length of the symbol level rate-matching pattern (1418) can be calculated as the symbol length (1419) of the downlink channel or downlink signal. Based on this, the terminal can determine the starting point and length of the symbol of the symbol level rate-matching pattern, and the terminal can receive the PDSCH after rate-matching based on the corresponding pattern (1418) in the PDSCH (1411) resource.

[0436] Referring to FIG. 14C, when the start symbol (1425) of the downlink channel or downlink signal is greater than or equal to the start symbol (1424) of the PDSCH time resource (i.e., when the start symbol (1425) of the downlink channel or downlink signal is faster than or equal to the start symbol (1424) of the PDSCH time resource in the time domain), a rate-matching pattern can be calculated and determined through the following method. At this time, the case where the end point (1427) of the downlink channel or downlink signal symbol is greater than the end point (1426) of the PDSCH symbol can also be considered (i.e., when the time resource of the downlink channel or downlink signal is only partially included in the time resource of the PDSCH).

[0437] ■ PDSCH time resource symbol end point (1426) < downlink channel or downlink signal symbol end point (1427)

[0438] ◆ The starting symbol of the symbol level rate-matching pattern (1430) is the starting symbol (1426) of the downlink channel or downlink signal, and the symbol length of the symbol level rate-matching pattern (1430) can be calculated as (symbol length of PDSCH (1428) - (starting symbol of the downlink channel or downlink signal (1425) - PDSCH starting symbol (1424))). Based on this, the terminal can determine the starting point and length of the symbol of the symbol level rate-matching pattern, and the terminal can receive the PDSCH after rate-matching based on the corresponding pattern (1430) in the PDSCH (1421) resource.

[0439] Method 2. A method in which a base station performs symbol-level rate matching through upper-layer signaling information.

[0440] A base station may set one or more symbol-level rate-matching resources through upper-layer signaling. The rate-matching resource setting information may include time-axis resource allocation information and period information. For example, if all or part of the time and frequency resources of a scheduled PDSCH overlap with a rate-matching resource set by the base station, the base station may transmit the PDSCH corresponding to the rate-matching resource by performing symbol-level rate-matching. Additionally, if all or part of the time and frequency resources of a scheduled PDSCH overlap with a rate-matching resource set by the base station, the terminal may assume that the PDSCH resource has been rate-matched in the symbol-level rate-matching resource portion and perform reception and decoding of the PDSCH (performing PDSCH reception and decoding in the area excluding the region designated as the symbol-level rate-matching resource among the PDSCH allocated resources or regions).

[0441] Method 3. Method in which a base station indicates a symbol level rate matching pattern via DCI format

[0442] The base station may set up one or more symbol-level rate-matching resources through upper-layer signaling as in Method 2, and may dynamically instruct the terminal via DCI whether to rate-match PDSCH in the rate-matching resources. At this time, the 'rate-matching indicator' within the DCI format may be reused, and a separate indicator may be additionally included in the DCI format to perform symbol-level rate-matching.

[0443] Specifically, the base station may select some of the configured rate matching resources (e.g., configured through upper layer signaling of the method) and group them into rate matching resource groups. The base station may indicate to the terminal via DCI using a bitmap method whether the PDSCH is rate matching for each rate matching resource group. For example, assuming that RMR#1, RMR#2, RMR#3, and RMR#4 are configured as four rate matching resources, and RMG(rate matching group)#1 = {RMR#1, RMR#2} and RMG#2 = {RMR#3, RMR#4} are configured as rate matching groups, the DCI field may use 2 bits to indicate to the terminal via a bitmap whether the rate is matching in RMG#1 and RMG#2, respectively. The DCI format mentioned in the above method may be a DCI that dynamically schedules the PDSCH, or a DCI that enables the SPS PDSCH. Although the activation of rate matching resource groups was described above, it may also be possible to instruct the activation / deactivation of rate matching resources through DCI.

[0444] Next, the DMRS rate matching method for PDSCH transmission and reception will be explained.

[0445] As explained above regarding PDSCH and symbol-level rate matching, when a PDSCH overlaps with a downlink channel or downlink signal configured with a waveform different from the PDSCH, the time resources of the PDSCH can be rate-matched at the symbol level. In this case, if the first DMRS symbol of the PDSCH overlaps with the downlink channel or downlink signal, the terminal may not be able to receive the first DMRS due to the symbol-level rate matching. This will be explained in more detail through Figures 15 and 16 below.

[0446] FIG. 15 is a diagram illustrating a situation in which a PDSCH and another downlink channel or downlink signal overlap according to one embodiment of the present disclosure.

[0447] Referring to FIG. 15, a scheduled PDSCH (1501) may be superimposed with a downlink channel or downlink signal (1502) having a waveform different from that of the PDSCH. In this case, the first symbol of the DMRS (1503) included in the PDSCH may be the same as the first symbol of the PDSCH (1501). In this case, when the symbol level rate matching described above is performed, the DMRS resources of the PDSCH may also be rate-matched. The following methods describe a method for controlling the rate matching of the DMRS resources of the PDSCH.

[0448] Method 1. DMRS symbol rate matching method when the starting symbol of PDSCH is always fixed to 0 and the starting symbol of DMRS is fixed to the Nth position

[0449] If a symbol in which the DMRS of the PDSCH is transmitted overlaps with a symbol in which a downlink channel or downlink signal is transmitted, the terminal may not use the overlapping symbol for PDSCH reception. That is, the overlapping symbols in the PDSCH are excluded, and even if the overlapping symbols are symbols in which the DMRS is transmitted, they may be excluded from PDSCH reception and DMRS reception. In this case, since the terminal cannot receive the symbols in which the DMRS is transmitted, channel estimation may be impossible or degraded in the corresponding symbol (the symbol for which rate matching was performed). However, since the PDSCH can be decoded based on the degraded channel estimation or pre-stored channel information, the terminal can receive the PDSCH.

[0450] Method 2. DMRS symbol rate matching method when the PDSCH start symbol can be set to a maximum of 0 to N-1 within the slot and the DMRS start symbol is fixed as the PDSCH start symbol.

[0451] FIG. 16 is a diagram illustrating a method of moving the DMRS start symbol of PDSCH according to one embodiment of the present disclosure.

[0452] Referring to FIG. 16, a base station can schedule a PDSCH composed of time domain resources (1601) and frequency domain resources (1602) to a terminal. The PDSCH may overlap with a downlink channel or downlink signal (1603) in which a waveform different from the PDSCH is set. At this time, based on the methods for PDSCH and symbol-level rate matching described above, the PDSCH may be rate-matched by the overlapped symbol length (1605). The original DMRS start symbol (1606) for the PDSCH is the same as the start symbol of the PDSCH, and the DMRS may not be received when rate-matching is performed. Therefore, the DMRS for the PDSCH may be shifted by the overlapped symbol length (1605). For example, when rate-matching is applied, the base station may transmit the DMRS for the PDSCH from a symbol shifted by the overlapped symbol length (1605). Accordingly, the terminal can receive PDSCH (1604) including DMRS (1607) and maintain channel estimation performance. The terminal can receive PDSCH (1604) based on channel state estimation through DMRS (1607).

[0453] Next, we will explain the method for moving the PDSCH start symbol using a symbol-level offset during PDSCH transmission and reception.

[0454] For a PDSCH transmission resource, when the PDSCH and a downlink channel or downlink signal set with a waveform different from the PDSCH overlap, the start symbol of the PDSCH resource may be shifted from the base station by a set and / or indicated symbol offset.

[0455] FIG. 17 is a diagram showing that when different waveforms are superimposed according to one embodiment of the present disclosure, the starting symbol of a PDSCH resource is moved by a symbol offset.

[0456] According to FIG. 17, a base station may schedule a PDSCH (1701) to a terminal based on at least one waveform of DFT-s-OFDM, CP-OFDM, or OTFS. At this time, the scheduled PDSCH (1701) may overlap with a downlink channel or downlink signal (1703) set with a waveform different from the PDSCH. At this time, the base station may transmit a PDSCH (1702) by shifting the start symbol (1706) of the scheduled PDSCH resource (1701) by the overlapped symbol (1705), and the terminal may receive the PDSCH (1702) by assuming a shift of the PDSCH start symbol by the overlapped symbol (1705). The terminal may assume that the PDSCH is not transmitted from a rate-matched resource (e.g., 1303 in FIG. 13) by the overlapped symbol. This ensures resource utilization efficiency of PDSCH and prevents the degradation of channel estimation performance caused by DMRS non-transmission.

[0457] For a method of determining nested symbols and determining, setting, or indicating symbol-level rate-matching patterns, refer to the description regarding symbol-level rate-matching for the PDSCH described above. That is, the symbol-level rate-matching pattern can be interpreted as the same as the symbol offset.

[0458] Meanwhile, the time resources of a PDSCH (i.e., the start symbol and symbol length) can be scheduled within a single slot. In this case, the length of the PDSCH time resource, with the start symbol shifted by a symbol offset, may extend beyond the boundary of a single slot. It is necessary to determine whether to transmit or receive the PDSCH for the PDSCH resources that have exceeded the slot boundary between the base station and the terminal. In this situation, the base station and the terminal may determine that they will not transmit or receive the PDSCH for the PDSCH resources that have exceeded the slot boundary resulting from the application of the offset.

[0459] FIGS. 18A and FIGS. 18B are drawings showing PDSCH resources extending beyond slot boundaries according to one embodiment of the present disclosure.

[0460] FIG. 18A illustrates a situation where, when a PDSCH and a downlink channel or downlink signal (1802) set with a waveform different from the PDSCH overlap, the start symbol of the scheduled PDSCH resource is shifted by the overlapped symbol (1804) to transmit and receive the PDSCH (1801). At this time, a portion (1803) of the time resource of the PDSCH (1801) with the shifted start symbol may exceed the slot boundary (1805). As described above, since the time resource of the PDSCH is scheduled within one slot, a solution for the time domain resource that exceeds the limit is required.

[0461] According to FIG. 18B, the starting symbol of a rowed PDSCH resource can be shifted by the number of overlapping symbols (1814) to transmit and receive PDSCH (1816). However, a portion of the time resource of the PDSCH (1816) with the shifted starting symbol may exceed the slot boundary (1815). The base station and the terminal may determine that PDSCH is not transmitted or received in the PDSCH time resource that exceeds the slot boundary (1815). That is, the PDSCH time resource may not be used for PDSCH transmission (1813). The base station and the terminal may perform at least one operation of rate matching or puncturing on the original PDSCH resource for the resource (the PDSCH time resource that exceeds the slot boundary).

[0462] Next, the CSI-RS overlap control method for PDSCH transmission and reception will be explained.

[0463] FIG. 19 is a diagram showing a situation in which PDSCH and CSI-RS overlap according to one embodiment of the present disclosure.

[0464] The base station may set an SPS PDSCH or a PDSCH repeated transmission (1901) for the terminal, and a situation may occur where the PDSCH transmission and the CSI-RS resource (1902) overlap. In this case, the PDSCH may be a PDSCH set to at least one of DFT-s-OFDM, CP-OFDM, or OTFS. The CSI-RS may use a waveform different from the waveform set in the PDSCH. In this case, to alleviate the implementation complexity of the terminal and to maximize the advantages of each waveform, it may be permitted to transmit only one waveform in the same time resource. In this context, the base station and the terminal need to determine which downlink channel (PDSCH or CSI-RS) to transmit and receive in the same time resource. Accordingly, the base station may set or instruct a PDSCH priority indicator to the terminal to indicate which resource to prioritize when there is an overlap between the PDSCH and the downlink channel or downlink signal.

[0465] As one method, the base station may set PDSCH priority configuration information for the terminal through upper-layer signaling. If the priority configuration information within the PDSCH configuration information of the upper-layer signaling is set, the terminal can determine that the PDSCH is transmitted in the corresponding symbol when an overlap occurs between the PDSCH and another downlink channel or downlink signal. In this case, it can determine that the overlapping downlink channel or downlink signal (in this case, CSI-RS) is not transmitted in the corresponding symbol.

[0466] As another method, the base station may indicate to the terminal whether PDSCH is prioritized based on the above configuration information, through the PDSCH priority indicator in the DCI format.

[0467] FIG. 20 is a drawing showing a PDSCH priority indicator according to one embodiment of the present disclosure.

[0468] According to FIG. 20, a base station may enable or instruct a terminal to transmit SPS PDSCH or repeat PDSCH transmission via a DCI format. The DCI format may include an indicator (e.g., a PDSCH priority indicator). Meanwhile, some symbols of the indicated PDSCH transmission resources (2001) may overlap with another downlink channel or downlink signal (e.g., CSI-RS (2002)). In this case, the terminal may determine which downlink channel or downlink signal to receive in the overlapped symbol based on the PDSCH priority indicator information. For example, if the base station indicates the PDSCH priority indicator in the DCI format as 0 (2003), the terminal may determine that it does not receive PDSCH (2001) in the overlapped symbol and determine that it receives CSI-RS (2002). As another example, if the base station indicates the PDSCH priority indicator in the DCI format as 1 (2004), the terminal can determine that it is receiving PDSCH (2001) in the overlapping symbol and that it is not receiving CSI-RS (2002). As another example, if the base station indicates the PDSCH priority indicator in the DCI format as 0 (2003), the base station can determine that it is not transmitting PDSCH (2001) in the overlapping symbol and that it is transmitting CSI-RS (2002). As yet another example, if the base station indicates the PDSCH priority indicator in the DCI format as 1 (2004), the base station can determine that it is transmitting PDSCH (2001) in the overlapping symbol and that it is not transmitting CSI-RS (2002). The names of the above PDSCH priority indicators are merely examples, and the names of the indicators are not limited to these. In addition, although the case where the value of the above indicator is set to 0 or 1 has been described, the opposite interpretation of the values ​​0 and 1 is not excluded.Additionally, a value of 0 may be set when the information field is omitted, and if the information field is included, it may be interpreted as a value of 1 being set.

[0469] Meanwhile, although the overlap between PDSCH and CSI-RS was mainly explained through Figures 19 and 20 above, this is merely an example and can be applied in the same way to cases where other downlink channels or downlink signals other than CSI-RS overlap.

[0470] FIG. 21 illustrates the structure of a terminal in a wireless communication system according to embodiments of the present disclosure.

[0471] Referring to FIG. 21, a terminal according to one embodiment may include a transceiver (2110), a memory (2120), and a processor (2130). The transceiver (2110), memory (2120), and processor (2130) of the UE may operate according to the communication method of the terminal described above. However, the components of the terminal are not limited thereto. For example, the terminal may include more or fewer components than those described above. Additionally, the processor (2130), the transceiver (2110), and the memory (2120) may be implemented as a single chip. Additionally, the processor (2130) may include at least one processor.

[0472] The transceiver (2110) collectively refers to a UE receiver and a UE transmitter and can transmit and receive signals with a base station or network entity. The signals transmitted and received with the base station or network entity may include control information and data. The transceiver (2110) may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal and an RF receiver for low-noise amplification and down-converting the frequency of a received signal. However, this is merely an example of the transceiver (2110), and the components of the transceiver (2110) are not limited to an RF transmitter and an RF receiver.

[0473] Additionally, the transceiver (2110) can receive a signal through a wireless channel and output it to a processor (2130), and transmit the signal output from the processor (2130) through a wireless channel. The memory (2120) can store programs and data required for the operation of the UE. Additionally, the memory (2120) can store control information or data included in a signal acquired by the UE. The memory (2120) may be a storage medium or a combination of storage media such as read-only memory (ROM), random access memory (RAM), a hard disk, CD-ROM, and DVD.

[0474] The processor (2130) can control a series of processes to operate the terminal. For example, the transceiver (2110) can receive a data signal including a control signal transmitted by a base station or network entity, and the processor (2130) can determine the result of receiving the control signal and data signal transmitted by the base station or network entity.

[0475] FIG. 22 illustrates the structure of a base station in a wireless communication system according to embodiments of the present disclosure.

[0476] Referring to FIG. 22, a base station according to one embodiment may include a transceiver (2210), a memory (2220), and a processor (2230). The transceiver (2210), memory (2220), and processor (2230) of the base station may operate according to the communication method of the base station described above. However, the components of the base station are not limited thereto. For example, the base station may include more or fewer components than those described above. Additionally, the processor (2230), the transceiver (2210), and the memory (2220) may be implemented as a single chip. Additionally, the processor (2230) may include at least one processor.

[0477] The transceiver (2210) collectively refers to a base station receiver and a base station transmitter, and can transmit and receive signals with a terminal or network entity. The signals transmitted and received with the terminal or network entity may include control information and data. The transceiver (2210) may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal and an RF receiver for low-noise amplification and down-converting the frequency of a received signal. However, this is merely an example of the transceiver (2210), and the components of the transceiver (2210) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (2210) can receive a signal through a wireless channel and output it to a processor (2230), and transmit the signal output from the processor (2230) through a wireless channel.

[0478] The memory (2220) can store programs and data necessary for the operation of the base station. Additionally, the memory (2520) can store control information or data included in signals acquired by the base station. The memory (2220) may be a storage medium or a combination of storage media, such as read-only memory (ROM), random access memory (RAM), a hard disk, CD-ROM, or DVD.

[0479] The processor (2230) can control a series of processes to enable the base station to operate as described above. For example, the transceiver (2210) can receive a data signal including a control signal transmitted by a terminal, and the processor (2230) can determine the result of receiving the control signal and the data signal transmitted by the terminal.

[0480] Methods according to the claims or embodiments described in the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0481] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to the claims or embodiments described in the specification of this disclosure.

[0482] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0483] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0484] In the specific embodiments of the present disclosure described above, the components included in the present disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0485] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, a base station and a terminal may be operated by combining parts of one embodiment of the present disclosure with parts of another embodiment. For example, a base station and a terminal may be operated by combining parts of the first embodiment and the second embodiment of the present disclosure. In addition, although the above embodiments are presented based on an FDD LTE system, other variations based on the technical concept of the above embodiments may be implemented in other systems such as TDD LTE systems, 5G, or NR systems.

[0486] Meanwhile, the order of description in the drawings illustrating the method of the present disclosure does not necessarily correspond to the order of execution, and the order of execution may be changed or executed in parallel.

[0487] Alternatively, drawings describing the method of the present invention may omit some components and include only some components to the extent that the essence of the present disclosure is not impaired.

[0488] In addition, the method of the present disclosure may be executed by combining some or all of the contents included in each embodiment to the extent that it does not impair the essence of the disclosure. The memory may store programs and data necessary for the operation of the base station. In addition, the memory may store control information or data included in signals transmitted and received by the base station. The memory may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. In addition, there may be multiple memories.

[0489] A processor can control a series of processes to enable a base station to operate according to the embodiments of the present disclosure described above. For example, the processor can control each component of the base station to configure two layers of DCIs containing allocation information for a plurality of PDSCHs and to transmit them. There may be multiple processors, and the processors can perform control operations on the components of the base station by executing a program stored in memory.

[0490] Methods according to the claims of the present disclosure or the embodiments described in the disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0491] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to the claims of the present disclosure or the embodiments described in the disclosure.

[0492] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0493] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0494] In the specific embodiments of the present disclosure described above, the components included in the embodiments are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0495] Meanwhile, the embodiments of the present disclosure disclosed in the drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, a base station and a terminal may be operated by combining parts of one embodiment of the present disclosure with parts of another embodiment. For example, a base station and a terminal may be operated by combining parts of the first embodiment and the second embodiment of the present disclosure. In addition, other variations based on the technical concept of the above embodiments may be implemented in other systems, such as FDD LTE systems, TDD LTE systems, 5G or NR systems.

[0496] Meanwhile, the order of description in the drawings illustrating the method of the present disclosure does not necessarily correspond to the order of execution, and the order of execution may be changed or executed in parallel.

[0497] Alternatively, drawings describing the method of the present disclosure may omit some components and include only some components to the extent that the essence of the present disclosure is not impaired.

[0498] Additionally, the method of the present disclosure may be implemented by combining some or all of the contents included in each embodiment to the extent that it does not impair the essence of the present disclosure.

[0499] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only and is not limited to the embodiments disclosed. Those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present disclosure. The scope of the present disclosure is defined by the claims set forth below rather than by the foregoing detailed description, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included within the scope of the present disclosure.

Claims

1. A method performed by a terminal in a wireless communication system, A step of identifying whether the downlink signal of the first waveform and the PDSCH (physical downlink shared channel) of the second waveform overlap; A step of determining that rate matching for the PDSCH is applied at the symbol where the downlink signal and the PDSCH overlap when the downlink signal and the PDSCH overlap; and A method comprising the step of receiving a PDSCH from a base station based on the above rate matching.

2. In Paragraph 1, The method further includes the step of receiving upper-layer signaling including at least one rate matching resource information from the base station, If the first resource information among the at least one rate matching resource information corresponds to the overlapping symbol, it is determined that rate matching for the PDSCH is applied at the symbol corresponding to the first resource information, or A method in which a rate matching pattern for applying rate matching to the PDSCH among the above at least one rate matching resource information is indicated as DCI (downlink control information).

3. In Paragraph 1, If the symbol determined to have the above rate matching applied includes a DMRS (demodulation reference signal) for the above PDSCH, and the symbol of the above DMRS is fixed, then the DMRS is rate-matched, and A method in which the DMRS for the PDSCH is included in a symbol determined to have the above rate matching applied, and if the symbol of the DMRS is not fixed, the position of the DMRS is moved by the length of the above overlapping symbol.

4. In Paragraph 1, The above downlink signal corresponds to the CSI-RS (channel state information-reference signal), and A method for determining whether to apply rate matching to the PDSCH in the overlap of the CSI-RS and the PDSCH based on priority indicator information received from the base station.

5. In a method performed by a base station in a wireless communication system, A step of identifying whether the downlink signal of the first waveform for the terminal and the PDSCH (physical downlink shared channel) of the second waveform overlap; If the downlink signal and the PDSCH overlap, a step of performing rate matching for the PDSCH at the symbol where the downlink signal and the PDSCH overlap; and A method comprising the step of transmitting PDSCH to the terminal based on the above rate matching.

6. In Paragraph 5, The method further includes the step of transmitting upper-layer signaling comprising at least one rate matching resource information to the terminal, If the first resource information among the at least one rate matching resource information corresponds to the overlapping symbol, rate matching for the PDSCH is applied to the symbol corresponding to the first resource information, or A method of instructing the terminal via DCI (downlink control information) a rate matching pattern for applying rate matching to the PDSCH among the above at least one rate matching resource information.

7. In Paragraph 5, If the symbol determined to have the above rate matching applied includes a DMRS (demodulation reference signal) for the PDSCH, and the symbol of the DMRS is fixed, the base station rate-matches the DMRS, and A method in which, if the DMRS for the PDSCH is included in a symbol determined to have the above rate matching applied, and the symbol of the DMRS is not fixed, the base station moves the position of the DMRS by the length of the overlapping symbol.

8. In Paragraph 5, The above downlink signal corresponds to the CSI-RS (channel state information-reference signal), and A method for transmitting priority indicator information to the terminal to determine whether rate matching for the PDSCH is applied in the overlap of the above CSI-RS and the above PDSCH.

9. In a terminal of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and The terminal is connected to communicate with at least one processor and is capable of executing individually or in any combination of the at least one processor, so that the terminal, Identify whether the downlink signal of the first waveform and the PDSCH (physical downlink shared channel) of the second waveform overlap, and If the downlink signal and the PDSCH overlap, it is determined that rate matching for the PDSCH is applied at the symbol where the downlink signal and the PDSCH overlap, and A memory storing a command to receive PDSCH from a base station based on the above rate matching; A terminal including 10. In Paragraph 9, The above command, the above terminal, Control to receive upper-layer signaling including at least one rate matching resource information from the base station, and If the first resource information among the at least one rate matching resource information corresponds to the overlapping symbol, it is determined that rate matching for the PDSCH is applied at the symbol corresponding to the first resource information, or A terminal in which a rate matching pattern for applying rate matching to the PDSCH among the above at least one rate matching resource information is indicated as DCI (downlink control information).

11. In Paragraph 9, If the symbol determined to have the above rate matching applied includes a DMRS (demodulation reference signal) for the above PDSCH, and the symbol of the above DMRS is fixed, then the DMRS is rate-matched, and A terminal in which the DMRS for the PDSCH is included in the symbol determined to have the above rate matching applied, and if the symbol of the DMRS is not fixed, the position of the DMRS is moved by the length of the above overlapping symbol.

12. In Paragraph 9, The above downlink signal corresponds to the CSI-RS (channel state information-reference signal), and A terminal that determines whether to apply rate matching to the PDSCH in the overlap of the CSI-RS and the PDSCH based on priority indicator information received from the base station.

13. In a base station of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and The base station is connected to communicate with at least one processor and is capable of executing individually or in any combination of the at least one processor, and, Identify whether the downlink signal of the first waveform for the terminal and the PDSCH (physical downlink shared channel) of the second waveform overlap, and When the downlink signal and the PDSCH overlap, rate matching for the PDSCH is performed at the symbol where the downlink signal and the PDSCH overlap, and A memory storing a command to transmit PDSCH to the terminal based on the above rate matching; Base station including 14. In Paragraph 13, The above command, the above base station, Transmitting upper-layer signaling including at least one rate matching resource information to the above terminal, and If the first resource information among the at least one rate matching resource information corresponds to the overlapping symbol, rate matching for the PDSCH is applied to the symbol corresponding to the first resource information, or A base station that instructs the terminal as DCI (downlink control information) a rate matching pattern for applying rate matching to the PDSCH among the at least one rate matching resource information.

15. In Paragraph 13, If the symbol determined to have the above rate matching applied includes a DMRS (demodulation reference signal) for the PDSCH, and the symbol of the DMRS is fixed, the base station rate-matches the DMRS, and A base station in which the DMRS for the PDSCH is included in the symbol determined to have the above rate matching applied, and if the symbol of the DMRS is not fixed, the base station moves the position of the DMRS by the length of the overlapping symbol.

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