Method and apparatus for performing SBFD-based communication in wireless communication system

Abstract

Embodiments may include receiving, from a BS, sub-band frequency information related to a frequency domain resource allocation for an UL sub-band; receiving, from the BS, DCI related to a frequency domain resource allocation for the PDSCH; identifying a PRG including at least one PRB for the PDSCH based on the sub-band frequency information and the DCI; and receiving the PDSCH from the BS on the basis of the PRG.

Description

Technical Field

[0001] The present disclosure generally relates to a wireless communication system, and more particularly, to a method for performing data channel transmission or reception with a user equipment (UE) supporting full-duplex communication in a wireless communication system. Background Art

[0002] The fifth-generation (5G) mobile communication technology defines a wide frequency band capable of achieving high transmission rates and new services, and can be implemented not only in a sub-6 GHz band such as 3.5 gigahertz (GHz), but also in a band above 6 GHz called millimeter wave (mmWave) including 28 GHz and 39 GHz. In addition, the implementation of the sixth-generation (6G) mobile communication technology (referred to as the super 5G system) in the terahertz (THz) band (e.g., 95 GHz to 3 THz band) has been considered in order to achieve a transmission rate fifty times faster than that of the 5G mobile communication technology and an ultra-low latency that is one-tenth of that of the 5G mobile communication technology.

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

[0004] Regarding the services supported by 5G mobile communication technology, the industry is continuously discussing improvements and performance enhancements to the initial 5G mobile communication technology, and physical layer standardization of the following technologies has been completed: for example, vehicle-to-everything (V2X) for assisting autonomous vehicles in making driving decisions based on information about the position and status of the vehicle sent by the vehicle and for improving user convenience, new radio unlicensed (NR-U) aiming for system operation to comply with various regulatory requirements in unlicensed bands, NR UE energy saving, non-terrestrial network (NTN) as UE satellite direct communication for ensuring coverage in areas where terrestrial network communication is not possible, and positioning.

[0005] The standardization of air interface architectures / protocols for the following technologies is also continuously advancing: for example, Industrial Internet of Things (IIoT) for supporting new services through interoperability and integration with other industries, Integrated Access and Backhaul (IAB) for providing nodes for network service area expansion by integrally supporting wireless backhaul links and access links, mobility enhancements including conditional handover and Dual-Active Protocol Stack (DAPS) handover, and two-step random access (2-step RACH for NR) for simplifying the random access process. The standardization of system architectures / services for the following technologies is also continuously advancing: 5G service-based architecture or service-based interface for combining Network Function Virtualization (NFV) and Software Defined Network (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE location.

[0006] With the commercialization of 5G mobile communication systems, exponentially growing connected devices will be connected to communication networks. Therefore, enhanced functions and performance of 5G mobile communication systems and integrated operation of connected devices are expected. For this purpose, new research on the following technologies has been put on the agenda: Extended Reality (XR) for efficiently supporting Augmented Reality (AR), Virtual Reality (VR), Mixed Reality (MR), etc., 5G performance improvement and complexity reduction by leveraging Artificial Intelligence (AI) and Machine Learning (ML), AI service support, Metaverse service support, and drone communication.

[0007] This development of 5G mobile communication systems will not only lay the foundation for the development of the following technologies: new waveforms for providing coverage in the THz band of 6G mobile communication technology, multi-antenna transmission such as Full-Dimension MIMO (FD-MIMO), array antennas, and massive antennas, metamaterial-based lenses and antennas for improving the coverage of THz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), and Reconfigurable Intelligent Surface (RIS), but also lay the foundation for the development of the following technologies: full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and enhancing the system network, AI-based communication technology for achieving system optimization by leveraging satellites and AI from the design phase and internalizing end-to-end AI support functions, and next-generation distributed computing technology for realizing services with a complexity level beyond the UE operation capacity limit by leveraging ultra-high-performance communication and computing resources.

[0008] Wireless communication systems are evolving towards broadband wireless communication systems that utilize the following communication standards to provide high-speed and high-quality packet data services. The communication standards can be, for example, High-Speed Packet Access (HSPA) of 3GPP, LTE {Long-Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)}, LTE-Advanced (LTE-A), LTE-pro, High Rate Packet Data (HRPD) of 3GPP2, Ultra Mobile Broadband (UMB), IEEE 802.16e, etc. Typical voice-based services are also provided.

[0009] As an example, the LTE system adopts an Orthogonal Frequency Division Multiplexing (OFDM) scheme in the DL and a Single-Carrier Frequency Division Multiple Access (SC-FDMA) scheme in the UL. The UL indicates the radio link through which the UE sends data or control signals to the BS (eNode B), and the DL indicates the radio link through which the BS sends data or control signals to the UE. The above multiple access scheme can separate the data or control information of each user by allocating and operating time-frequency resources for sending data or control information for each user to avoid overlapping with each other and establish orthogonality.

[0010] Since the 5G communication system, as a post-LTE communication system, must freely reflect various requirements of users, service providers, etc., it must support services that meet various requirements. Services considered in the 5G communication system include eMBB communication, mMTC, URLLC, etc.

[0011] eMBB aims to provide a higher data rate than that supported by existing LTE, LTE-A, or LTE-Pro. For example, in the 5G communication system, eMBB must provide a peak data rate of 20 Gbps in the DL for a single BS and a peak data rate of 10 Gbps in the UL. In addition, the 5G communication system must provide an increased user-perceived data rate and a maximum data rate to the UE. To meet this requirement, transmission / reception technologies including further enhanced MIMO transmission technology need to be improved. In addition, the data rate required by the 5G communication system can be obtained by using a frequency bandwidth greater than 20 MHz in the frequency band from 3 GHz to 6 GHz or 6 GHz or higher, rather than using a transmission bandwidth of at most 20 MHz in the 2 GHz frequency band used in LTE to send signals.

[0012] In addition, mMTC is considered to support application services such as the Internet of Things (IoT) in 5G communication systems. mMTC needs to support the connection of a large number of UEs in a cell, enhance the coverage of UEs, improve battery life, reduce the cost of UEs, etc., in order to efficiently provide IoT. Since IoT provides communication functions while being provided to various sensors and various devices, it must support a large number of UEs in a cell (for example, 1 million per square kilometer). In addition, UEs supporting mMTC may require a wider coverage range than UEs for other services provided by 5G communication systems, because in view of the characteristics of the service, UEs are likely to be in shadow areas where cell signals cannot cover, such as basements of buildings. UEs supporting mMTC must be configured to be inexpensive and may require a very long battery life, such as 10 to 15 years, because it is difficult to replace the battery of UEs frequently.

[0013] URLLC is a mission-critical wireless communication service based on cellular networks and can be used for remote control of robots or machines, industrial automation, drones, remote healthcare, emergency alerts, etc. Therefore, URLLC must provide communication with ultra-low latency and ultra-high reliability. For example, services supporting URLLC must meet an air interface latency of less than 0.5 milliseconds (ms), and also require -5 a packet error rate of 10 or less. Therefore, for services supporting URLLC, the 5G system must provide a transmission time interval shorter than that of other services, and may also require a design for allocating a large amount of resources in the frequency band to ensure the reliability of the communication link.

[0014] These three 5G services, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in a single system. To meet the different requirements of the corresponding services, different transmission / reception technologies and transmission / reception parameters can be used between the services.

[0015] However, in traditional technologies, scheduling in wireless communication systems is defective. For example, when the frequency resources of an uplink sub-band are scheduled in the PDSCH, processing the PDSCH may be inefficient.

[0016] Thus, there is a need in the art for an improved PDSCH scheduling method in wireless communication systems. Summary of the Invention

[0017] [Solution to the Problem]

[0018] The present disclosure has solved at least the above problems and / or disadvantages and provided at least the advantages described below.

[0019] Therefore, one aspect of the present disclosure is to provide a method and apparatus for smoothly performing communication based on sub-band non-overlapping full-duplex (SBFD).

[0020] One aspect of the present disclosure as disclosed herein is to provide a method for determining a precoding resource block group (PRG) grid considering an uplink (UL) subband configuration, a method for determining the size of a scheduled physical resource block (PRB), a method for interpreting downlink (DL) and UL bandwidth parts (BWPs), and a method for determining consecutive DL BWPs.

[0021] One aspect of the present disclosure is to provide a method for managing PRBs in SBFD-based communication and a method and apparatus for transmitting or receiving a reference signal (RS) in a wireless communication system.

[0022] According to one aspect of the present disclosure, there is provided a method for scheduling a physical DL shared channel (PDSCH) in a wireless communication system, including: when a user equipment (UE) receives a PDSCH from a base station (BS), interpreting scheduling information by referring to information associated with a UL subband. The interpretation method may be a method for interpreting the size of a PRB and the size of a BWP suitable for full-duplex communication. An embodiment may include a method for determining a PRG grid and a PRB bundling size suitable for full-duplex communication when the UE receives a PDSCH from the BS.

[0023] According to one aspect of the present disclosure, the method includes: receiving a first control signal from the BS; processing the received first control signal; and transmitting a second control signal generated based on the processing to the BS.

[0024] [Advantages of the Invention]

[0025] Aspects of the present disclosure are to solve at least the above problems and / or disadvantages and to provide at least the advantages described below. Accordingly, aspects of the present disclosure are to provide an efficient communication method in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] From the following description in conjunction with the drawings, the above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent, in which:

[0027] Figure 1 show the time-frequency domain in a wireless communication system according to an embodiment;

[0028] Figure 2 show a frame, a subframe, and a time slot in a wireless communication system according to an embodiment;

[0029] Figure 3 show the configuration of a BWP in a wireless communication system according to an embodiment;

[0030] Figure 4 show the configuration of a control region of a DL control channel in a wireless communication system according to an embodiment;

[0031] Figure 5 Shows the DL control channel in a wireless communication system according to an embodiment;

[0032] Figure 6 Shows a method for transmitting or receiving data by a BS and a UE in a wireless communication system according to an embodiment considering a DL data channel and rate matching resources;

[0033] Figure 7 Shows the frequency-domain resource allocation of the PDSCH in a wireless communication system according to an embodiment;

[0034] Figure 8 Shows the time-domain resource allocation of the PDSCH in a wireless communication system according to an embodiment;

[0035] Figure 9 Shows the time-domain resource allocation according to the subcarrier spacing of a data channel and a control channel in a wireless communication system according to an embodiment;

[0036] Figure 10 Shows the radio protocol structures of a BS and a UE in a single-cell scenario, a carrier aggregation scenario, and a dual-connection scenario in a wireless communication system according to an embodiment;

[0037] Figure 11 Shows the time-division duplex (TDD) configuration and the SBFD configuration according to an embodiment;

[0038] Figure 12 Shows a method for determining a PRG grid for a scheduled PRB according to an embodiment;

[0039] Figure 13 Shows a method for configuring UL sub-band frequency resources aligned with a PRG grid according to an embodiment;

[0040] Figure 14 Shows a method for configuring UL sub-band frequency resources not aligned with a PRG grid according to an embodiment;

[0041] Figure 15 Shows a method for determining a PRG size according to an embodiment;

[0042] Figure 16 Is a diagram showing the PDSCH configuration scheduled in an SBFD system according to an embodiment;

[0043] Figure 17 Shows a method for explaining the size of a scheduled PRB in an SBFD symbol / slot according to an embodiment;

[0044] Figure 18 Shows a method for explaining the DL BWP in an SBFD symbol / slot according to an embodiment;

[0045] Figure 19 is a diagram showing the operation of a UE according to an embodiment;

[0046] Figure 20 is a diagram showing the operation of a BS according to an embodiment;

[0047] Figure 21 shows a UE in a wireless communication system according to an embodiment; and

[0048] Figure 22 shows a BS in a wireless communication system according to an embodiment. Detailed Embodiments

[0049] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0050] For the sake of clarity and conciseness, descriptions related to well-known technical content in the art and not directly related to the present disclosure will be omitted.

[0051] For the same reason, in the drawings, some elements may be shown exaggeratedly, omitted, or schematically. The size of each element does not fully reflect the actual size. In the drawings, the same or corresponding elements have the same reference numerals.

[0052] Advantages and features of the present disclosure and ways to implement them will become apparent by referring to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and to inform those skilled in the art of the scope of the present disclosure. Throughout the specification, the same or similar reference numerals denote the same or similar elements. The terms described below are terms defined in consideration of the functions in the present disclosure and may vary according to the user, the user's intention, or habit. Therefore, these terms should be defined based on the entire disclosure.

[0053] In this document, the BS is an entity that allocates resources to terminals, and can be at least one of a gNode B, eNode B, Node B, radio access unit, BS controller, and a node on the network. The terminal can include a UE, mobile station (MS), cellular phone, smart phone, computer, or multimedia system capable of performing communication functions. In this document, DL refers to the radio link through which the BS sends signals to the terminal, and UL refers to the radio link through which the terminal sends signals to the BS. The LTE or LTE-A system can be described by way of example, but the embodiments of the present disclosure can also be applied to other communication systems with a similar technical background or channel type. Examples of such communication systems can include fifth-generation mobile communication technologies (5G, New Radio (NR), etc.) developed on top of LTE-A, and 5G covers existing LTE, LTE-A, or other similar services. Based on the determination of those skilled in the art, the embodiments herein can also be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0054] A unit in this document refers to a software element or hardware element that performs a predetermined function, such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). A unit serves a certain purpose. However, a unit is not always limited to a software or hardware definition. A unit can be configured to be stored in an addressable storage medium or configured to run on one or more processors. Thus, a unit includes the following elements: for example, software elements, object-oriented software elements, class elements, and task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a unit can be combined into a smaller number of elements or units, or can be divided into a larger number of elements or units. In addition, the elements and units can be implemented as one or more CPUs in a reproducing device or a secure multimedia card, and a unit can include one or more processors.

[0055] In the following description, for the purpose of description convenience, terms used to identify access nodes and to refer to network entities, messages, interfaces between network entities, various identification information, etc. are used illustratively. Therefore, the present disclosure is not limited by the terms used below, and other terms related to topics with equivalent technical meanings can be used.

[0056] In the following description, for the purpose of description convenience, terms and names defined in the Third Generation Partnership Project Long-Term Evolution (3GPP LTE) standard or NR standard will be used. However, the present disclosure is not limited by these terms and names, and can be applied to systems compliant with other standards in the same way.

[0057] In this document, the BS allocates resources to the terminal, and can be at least one of a radio access network (RAN) node, a next-generation Node B (gNode B, gNB), an evolved Node B (eNode B, eNB), a Node B, a radio access unit, a BS controller, and a node on the network. In the present disclosure, the term eNB may be used interchangeably with the term gNB. That is, the BS described as an eNB may indicate a gNB.

[0058] In the following description, the terminal may include a UE, a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. Of course, the examples of the BS and the terminal are not limited thereto.

[0059] In particular, the present disclosure may be applied to 3GPP NR (the fifth-generation mobile communication standard) and intelligent services based on 5G communication technology and IoT-related technologies (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related services, etc.). The terminal may refer to a mobile phone, an NB-IoT device, a sensor, and other wireless communication devices.

[0060] The methods in this document may include: when the BS configures PDSCH frequency resource information for the UE, performing scheduling by referring to the information associated with the UL sub-band; when the BS configures PDSCH frequency resource information for the UE, considering the RB bundling method of the UL sub-band; when the BS configures PDSCH frequency resource information for the UE, performing physical RB mapping in virtual RBs; and methods that do not consider the information associated with the UL sub-band and methods that consider the information associated with the UL sub-band.

[0061] NR time-frequency resources

[0062] Figure 1 Shows the time-frequency domain corresponding to the radio resource region for transmitting data or control channels in the 5G system.

[0063] Reference Figure 1 , the horizontal axis is the time domain, and the vertical axis is the frequency domain. In the time domain and the frequency domain, the basic unit of the resource is a resource element (RE) 101, which can be defined by one OFDM symbol 102 on the time axis and one subcarrier 103 on the frequency axis. Continuous REs (e.g., 12 REs) in the frequency domain may be a single RB 104.

[0064] Figure 2 Shows frames, sub-frames, and time slots in a wireless communication system according to an embodiment.

[0065] Reference Figure 2, shows frame 200, subframe 201, and time slot 202. A single frame 200 can be defined as 10 ms. A single subframe 201 can be defined as 1 ms. Thus, one frame 200 can include a total of 10 subframes 201. Additionally, a single time slot 202 and 203 can be defined as 14 OFDM symbols (i.e., the number of symbols in each time slot ). One subframe 201 can include one or more time slots 202 and 203, and the number of time slots 202 and 203 in each subframe 201 can vary according to the set values μ204 and 205 for the subcarrier spacing. Figure 2 Examples show the case when the subcarrier spacing set value is μ = 0 204 and when the subcarrier spacing set value is μ = 1 205. In the case of μ = 0 204, a single subframe 201 can include one time slot 202. In the case of μ = 1 205, a single subframe 201 can include two time slots 203. That is, according to the set value μ of the subcarrier spacing, the number of time slots in each subframe can be different. Thus, the number of time slots in each frame can also be different, and based on the subcarrier spacing set value μ and can be defined as shown in Table 1 below.

[0066] [Table 1]

[0067]

[0068] BWP

[0069] Figure 3 Shows the configuration of the BWP in a wireless communication system according to an embodiment.

[0070] Figure 3 Shows an example of configuring two BWPs (i.e., BWP#1 301 and BWP#2 302) in the UE bandwidth 300. The BS can configure a single BWP or multiple BWPs for the UE, and can configure the information shown in Table 2 below for each BWP.

[0071] [Table 2]

[0072]

[0073] The information is not limited to the above examples, and in addition to the configuration information, various parameters related to the BWP can also be configured for the UE. The information can be transmitted by the BS to the UE via high-layer signaling (e.g., Radio Resource Control (RRC) signaling). At least one of the one or more configured BWPs can be activated. Whether the configured BWP is activated can be transmitted to the UE semi-statically from the BS via RRC signaling or dynamically via Downlink Control Information (DCI).

[0074] Before establishing a connection to the RRC, the UE can receive the configuration of the initial BWP for initial access from the BS via the Master Information Block (MIB). More specifically, via the MIB in the initial access phase, the UE can receive configuration information associated with the search space and control region (e.g., Control Resource Set (CORESET)) in which the Physical Downlink Control Channel (PDCCH) is transmitted to receive the system information required for initial access (e.g., Remaining System Information (RMSI) or System Information Block 1 (SIB1)). The control region and search space configured via the MIB can be regarded as having an identifier (ID) of 0, respectively. The BS can notify the UE via the MIB of the configuration information associated with Control Region #0, such as frequency allocation information, time allocation information, parameter set, etc. In addition, the BS can notify the UE via the MIB of the configuration information associated with the monitoring period and timing regarding Control Region #0, i.e., the configuration information for Search Space #0. The UE can regard the frequency domain configured as Control Region #0 obtained from the MIB as the initial BWP for initial access. In this case, the identifier (ID) of the initial BWP can be regarded as 0.

[0075] The BWP configuration supported in 5G can be used for various purposes.

[0076] According to some embodiments, when the bandwidth supported by the UE is less than the system bandwidth, the BWP configuration can be used for backup. For example, the BS configures the frequency position of the BWP (Configuration Information 2) for the UE so that the UE can transmit or receive data at a predetermined frequency position in the system bandwidth.

[0077] To support different parameter sets, the BS can configure multiple BWPs for the UE. For example, to support data transmission or reception for the UE using both a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz, two BWPs can be configured to have a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz, respectively. Different BWPs can be frequency-division multiplexed (Frequency Division Multiplexing), and when data transmission or reception based on a predetermined subcarrier spacing is required, the BWP configured to have the corresponding subcarrier spacing can be activated.

[0078] The BS can configure different-bandwidth BWPs for the UE to reduce the UE's power consumption. For example, when the UE supports a bandwidth of 100 MHz and always uses the corresponding bandwidth to send or receive data, it may consume a large amount of power. In particular, when there is no traffic, from the perspective of power consumption, it may be inefficient to monitor unnecessary DL control channels in a large bandwidth of 100 MHz. Therefore, to reduce the UE's power consumption, the BS can configure a BWP with a relatively small bandwidth for the UE, such as a BWP of 20 MHz. When there is no traffic, the UE can perform monitoring in the 20-MHz BWP, and when data is generated, the UE can send or receive data in the 100-MHz BWP according to instructions from the BS.

[0079] In the method of configuring the BWP, before connecting to the RRC, the UE can receive configuration information associated with the initial BWP via the MIB in the initial access phase. More specifically, the UE can receive the configuration of the control region of the DL control channel from the MIB of the physical broadcast channel (PBCH), in which the DCI for scheduling the system information block (SIB) can be sent. The bandwidth of the control region configured via the MIB can be regarded as the initial BWP, and the UE can receive the physical DL shared channel (PDSCH) for sending the SIB via the configured initial BWP. In addition to the purpose of receiving the SIB, the initial BWP can be used for other system information (OSI), paging, or random access.

[0080] BWP change

[0081] When one or more BWPs are configured for the UE, the BS can indicate the BWP change (or handover or shift) to the UE by using the BWP indicator field in the DCI. For example, in Figure 3 , when the currently active BWP of the UE is BWP#1 301, the BS can use the BWP indicator in the DCI to indicate BWP#2 302 to the UE. The UE can perform a BWP handover to BWP#2 302 indicated by the BWP indicator received in the DCI.

[0082] As described above, the DCI-based BWP handover can be indicated by the DCI for scheduling the PDSCH or PUSCH, and therefore, when the UE receives a BWP handover request, the UE may need to smoothly receive or send the PDSCH or PUSCH scheduled by the corresponding DCI in the handover BWP. For this purpose, the standard has defined requirements associated with the delay time (TBWP) required for the BWP handover, and for example, the requirements can be defined as shown in Table 3 below.

[0083] [Table 3]

[0084]

[0085] The requirements associated with the BWP delay time can support Type 1 or Type 2, depending on the capabilities of the UE. The UE can report to the BS the type of BWP delay time it can support.

[0086] According to the requirements of the BWP switching delay time, when the UE receives a DCI including a BWP switching indicator in slot n, the UE can complete the switch to the new BWP indicated by the BWP switching indicator no later than the time point of slot n + TBWP, and can perform the transmission or reception of the data channel scheduled by the corresponding DCI in the newly switched BWP. When the BS expects to schedule a data channel in the new BWP, the BS can consider the UE's BWP switching delay time (TBWP) to determine the time-domain resource allocation for the data channel. That is, when scheduling a data channel in the new data BWP, in the method for the BS to determine the time-domain resource allocation for the data channel, the corresponding data channel can be scheduled after the BWP switching delay time. Therefore, the UE may not expect the DCI indicating the switch of the BWP to indicate a slot offset (K0 or K2) value less than TBWP.

[0087] When the UE receives a DCI indicating a BWP switch (e.g., DCI format 1_1 or 0_1), during the time interval from the third symbol of the slot in which the PDCCH including the corresponding DCI is received to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time-domain resource allocation indicator field in the corresponding DCI, the UE can refrain from performing any transmission or reception. For example, when the UE receives a DCI indicating the switch of the indicated BWP in slot n and the slot offset value indicated by the corresponding DCI is K, from the third symbol of slot n to the symbol before slot n + K (i.e., the last symbol of slot n + K - 1), the UE can refrain from performing any transmission or reception.

[0088] SS / PBCH block

[0089] The synchronization signal (SS) / PBCH block can be a physical layer channel block including the primary SS (PSS), secondary SS (SSS), and PBCH. Specifically, the elements included in the SS / PBCH block (or SSB) can be defined as follows.

[0090] The PSS is an RS for DL time / frequency synchronization, which provides a part of the cell ID information.

[0091] The SSS is used as a reference for DL time / frequency synchronization and provides the remaining cell ID information not provided by the PSS. In addition, the SSS can act as an RS for demodulating the PBCH.

[0092] The PBCH provides the necessary system information required for the UE to perform data channel and control channel transmission or reception. The basic system information may include search space-related control information indicating radio resource mapping information of the control channel, scheduling control information associated with an independent data channel for transmitting system information, etc.

[0093] The SS / PBCH block includes a combination of the PSS, SSS, and PBCH. A single SS / PBCH block or multiple SS / PBCH blocks can be transmitted within 5 ms, and each transmitted SS / PBCH block can be identified based on an index.

[0094] In the initial access phase, the UE can detect the PSS and SSS and can decode the PBCH. The UE can obtain the MIB from the PBCH, from which the CORESET #0 (corresponding to the control region with control region index 0) can be configured. The UE can assume the quasi-co-location (QCL) of the selected SS / PBCH block and the demodulation reference signal (DMRS) transmitted in the control region #0, and can monitor the control region #0. The UE can receive system information via the DCI transmitted in the control region #0. According to the received system information, the UE can obtain the random access channel (RACH)-related configuration information required for initial access. The UE can send a physical RACH (PRACH) to the BS considering the selected SS / PBCH index, and the BS that receives the PRACH can obtain information associated with the index of the SS / PBCH block selected by the UE. The BS can identify the block selected by the UE in the SS / PBCH block and the fact that the UE monitors the control region #0 related to the selected block.

[0095] PDCCH: Matters related to DCI

[0096] In the 5G system, the scheduling information of the physical uplink shared channel (PUSCH) or the physical downlink shared channel (PDSCH) may be included in the DCI and transmitted from the BS to the UE. The UE can monitor the fallback DCI format and the non-fallback DCI format associated with the PUSCH or PDSCH. The fallback DCI format can be configured as a fixed field predefined between the BS and the UE, and the non-fallback DCI format can include fields that can be configured.

[0097] The DCI can go through the channel coding and modulation processes and can be transmitted in the PDCCH which is a DL physical control channel. A cyclic redundancy check (CRC) is added to the DCI message payload, and the CRC can be scrambled by a radio network temporary identifier (RNTI) corresponding to the UE identity. Different RNTIs can be used according to the purpose of the DCI message such as UE-specific data transmission, power control command, random access response (RAR), etc. That is to say, the RNTI is not explicitly transmitted but is sent by being included in the CRC calculation process. When the UE receives the DCI message transmitted in the PDCCH, the UE can identify the CRC by using the allocated RNTI, and in the case where the CRC identification result is correct, the UE can identify that the corresponding message is sent to itself.

[0098] For example, the DCI scheduling the PDSCH associated with system information (SI) can be scrambled by the SI-RNTI. The DCI scheduling the PDSCH associated with the RAR message can be scrambled by the RA-RNTI. The DCI scheduling the PDSCH associated with the paging message can be scrambled by the P-RNTI. The DCI reporting the slot format indicator (SFI) can be scrambled by the SFI-RNTI. The DCI reporting the transmit power control (TPC) can be scrambled by the TPC-RNTI. The DCI scheduling the UE-specific PDSCH or PUSCH can be scrambled by the cell RNTI (C-RNTI).

[0099] DCI format 0_0 can be used as a fallback DCI for scheduling the PUSCH. In this case, the CRC can be scrambled by the C-RNTI. The DCI format 0_0 with the CRC scrambled by the C-RNTI can include information as shown in Table 4 below, for example.

[0100] [Table 4]

[0101]

[0102] DCI format 0_1 can be used as a non-fallback DCI for scheduling the PUSCH. In this case, the CRC can be scrambled by the C-RNTI. The DCI format 0_1 with the CRC scrambled by the C-RNTI can include information as shown in Table 5 below, for example.

[0103] [Table 5]

[0104]

[0105]

[0106]

[0107] DCI format 1_0 can be used as a fallback DCI for scheduling the PDSCH. In this case, the CRC can be scrambled by the C-RNTI. The DCI format 1_0 with a CRC scrambled by the C-RNTI can include information as shown in Table 6 below, for example.

[0108] [Table 6]

[0109]

[0110] DCI format 1_1 can be used as a non-fallback DCI for scheduling the PDSCH. In this case, the CRC can be scrambled by the C-RNTI. The DCI format 1_1 with a CRC scrambled by the C-RNTI can include information as shown in Table 7 below, for example.

[0111] [Table 7]

[0112]

[0113]

[0114]

[0115] PDCCH: CORESET, REG, CCE, Search Space

[0116] Figure 4 Shows the CORESET for transmitting the DL control channel in the 5G wireless communication system. Figure 4 Shows an example of configuring the UE BWP 410 on the frequency axis and configuring two control regions (control region #1 401 and control region #2 402) within one time slot 420 on the time axis. The control regions 401 and 402 can be configured in the predetermined frequency resources 403 within the entire UE BWP 410 on the frequency axis. On the time axis, the control region can be configured with one or more OFDM symbols, which can be defined as the control region length (CORESET duration 404). Refer to Figure 4 the example, the control region #1 401 is configured based on the control region length of two symbols, and the control region #2 402 is configured based on the control region length of one symbol.

[0117] The above-described control region in 5G can be configured for the UE by the BS via higher layer signaling (e.g., system information, MIB, RRC signaling). Configuring the control region for the UE can provide information associated with the identification of the control region, the frequency position of the control region, the symbol length of the control region, etc. For example, it can include multiple pieces of information as shown in Table 8 below.

[0118] [Table 8]

[0119]

[0120]

[0121] In Table 8, the tci-StatesPDCCH (or Transmission Configuration Indicator (TCI) state) configuration information may include information associated with one or more SS / PBCH block indices, where the SS / PBCH block indices are in a Quasi-Co-Located (QCL) relationship with the Demodulation Reference Signals (DMRS) transmitted in the corresponding control region, or may include information associated with Channel State Information Reference Signals (CSI-RS) indices.

[0122] Figure 5 Shown as the basic unit of time and frequency resources for DL control channel configurations available in 5G. According to Figure 5 , the basic unit of time and frequency resources configured for the control channel may be a Resource Element Group (REG) 503, and the REG 503 may be defined by 1 Orthogonal Frequency Division Multiplexing (OFDM) symbol 501 on the time axis and 1 Physical Resource Block (PRB) 502 on the frequency axis (i.e., 12 subcarriers). The Base Station (BS) may configure the DL control channel allocation unit by cascading REG 503s.

[0123] As Figure 5 shown, when the basic unit for allocating the DL control channel in 5G is a Control Channel Element (CCE) 504, 1 CCE 504 may include multiple REG 503s. A description of the REG 503 will be provided with reference to Figure 5 . When a REG 503 includes 12 Resource Elements (REs) and 1 CCE 504 includes 6 REG 503s, 1 CCE 504 includes 72 REs. When the DL control region is configured, the corresponding region includes multiple CCE 504s, and a predetermined DL control channel may be transmitted by mapping to a single CCE or multiple CCE 504s according to the Aggregation Level (AL) in the control region. The CCE 504s in the control region may be distinguished by numbering, and the numbering of the CCE 504s may be assigned according to a logical mapping scheme.

[0124] Figure 5 The basic unit of the DL control channel, i.e., the REG 503, may include the REs to which the Downlink Control Information (DCI) is mapped and the region to which the DMRS 505 is mapped. The DMRS 505 is a Reference Signal (RS) for decoding the DCI. As Figure 5As shown, three DMRS 505 can be sent in one REG 503. The number of CCEs required to send PDCCH can be 1, 2, 4, 8, or 16, depending on the aggregation level (AL), and different numbers of CCEs can be used to achieve link adaptation of the DL control channel. For example, in the case of AL = L, a single DL control channel can be sent via L CCEs. The UE needs to detect the signal without knowing the information associated with the DL control channel. A search space indicating a set of CCEs is defined for blind decoding. The search space is a set of candidate DL control channels including the CCEs that the UE should attempt to decode at a given aggregation level. There are various aggregation levels for bundling 1, 2, 4, or 16 CCEs into a single bundle, and thus the UE has multiple search spaces. The set of search spaces can be defined as the set of search spaces at all configured aggregation levels.

[0125] The search space can be classified into a common search space and a UE-specific search space. A group of UEs or all UEs can investigate the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling or paging messages associated with system information. For example, the scheduling allocation information of the PDSCH for sending the SIB including the operator information of the cell, etc. can be received by investigating the common search space for the PDCCH. Since a group of UEs or all UEs may need to receive the PDCCH, the common search space can be defined as a set of predetermined CCEs. The scheduling allocation information for the UE-specific PDSCH or PUSCH can be received by investigating the UE-specific search space for the PDCCH. By using the identity of the UE and a function with various system parameters, the UE-specific search space can be defined as specific to a certain UE.

[0126] In 5G, the parameters of the search space for the PDCCH can be configured for the UE by the BS via higher-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the BS can configure for the UE the number of candidate PDCCHs at each aggregation level L, the monitoring period for the search space, the search space monitoring occasion in terms of symbols in a time slot, the search space type (e.g., common search space or UE-specific search space), the DCI format and RNTI combination expected to be monitored in the corresponding search space, the index of the control region where the search space is expected to be monitored, etc. For example, it can include multiple pieces of information shown in Table 9 below.

[0127] [Table 9]

[0128]

[0129] According to the configuration information, the BS can configure a single search space set or multiple search space sets for the UE. The BS can configure search space set 1 and search space set 2 for the UE, and can perform the configuration such that the UE monitors DCI format A scrambled by X-RNTI in search space set 1 in the common search space, and can perform the configuration such that the UE monitors DCI format B scrambled by Y-RNTI in search space set 2 in the UE-specific search space.

[0130] According to the configuration information, there can be a single search space set or multiple search space sets in the common search space or the UE-specific search space. For example, search space set #1 and search space set #2 can be configured as the common search space, and search space set #3 and search space set #4 can be configured as the UE-specific search space.

[0131] In the common search space, the following combinations of DCI format and RNTI can be monitored. However, it is not limited to the following examples.

[0132] 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

[0133] DCI format 2_0, with CRC scrambled by SFI-RNTI

[0134] DCI format 2_1, with CRC scrambled by INT-RNTI

[0135] DCI format 2_2, with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0136] DCI format 2_3, with CRC scrambled by TPC-SRS-RNTI

[0137] In the UE-specific search space, the following combinations of DCI format and RNTI can be monitored.

[0138] DCI format 0_0 / 1_0, with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0139] DCI format 1_0 / 1_1, with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0140] The following specified RNTIs can conform to the following definitions and uses.

[0141] Cell RNTI (C-RNTI): For UE-specific PDSCH scheduling

[0142] Temporary Cell RNTI (TC-RNTI): Used for UE-specific PDSCH scheduling

[0143] Configured Scheduling RNTI (CS-RNTI): Used for semi-statically configured UE-specific PDSCH scheduling

[0144] Random Access RNTI (RA-RNTI): Used for PDSCH scheduling during the random access procedure

[0145] Paging RNTI (P-RNTI): Used to schedule the PDSCH on which paging is sent

[0146] System Information RNTI (SI-RNTI): Used to schedule the PDSCH

[0147] Interruption RNTI (INT-RNTI): Used to report whether puncturing of the PDSCH is performed

[0148] RNTI for PUSCH TPC (TPC-PUSCH-RNTI): Used to command power control of the PUSCH

[0149] RNTI for PUCCH TPC (TPC-PUCCH-RNTI): Used to command power control of the PUCCH

[0150] RNTI for SRS TPC (TPC-SRS-RNTI): Used to command power control of the SRS

[0151] The DCI formats described above can conform to the definitions shown in Table 10 below.

[0152] [Table 10]

[0153]

[0154] In 5G, the search space at aggregation level L in the search space set s and the control region p can be expressed as given in the following equation (1).

[0155]

[0156] In equation (1),

[0157] L: Aggregation level

[0158] n CI : Carrier index

[0159] N CCE,p : Total number of CCEs in the control region p

[0160] Time slot index

[0161] Number of candidate PDCCHs at aggregation level L

[0162] Candidate PDCCH index at aggregation level L

[0163] i = 0, …, L-1

[0164] Y p，-1 = n RNTI ≠0, A p = 39827 for pmod3 = 0, A p = 39829 for pmod3 = 1, A p = 39839 for pmod3 = 2, D = 65537

[0165] n RNTI : UE identifier

[0166] In the common search space, it can correspond to 0.

[0167] In the case of the UE-specific search space, it can correspond to values that vary based on the UE ID (C-RNTI or the ID configured by the BS for the UE) and the time index.

[0168] In 5G, multiple search space sets can be configured with different parameters in Table 9, and thus the set of search space sets monitored by the UE for each time point can be different. For example, when search space set #1 is configured based on the X time slot period, search space set #2 is configured based on the Y time slot period, and X and Y are different, the UE can monitor search space set #1 and search space set #2 in a predetermined time slot, and can monitor one of search space set #1 and search space set #2 in a predetermined time slot.

[0169] PDCCH: BD / CCE limitation

[0170] When multiple search space sets are configured for the UE, a method for determining the search space set to be monitored by the UE can be performed considering the following conditions.

[0171] When the UE is configured with r15monitoringcapability as the value of the high-layer signaling monitoringCapabilityConfig-r16, the UE can define, for each time slot, the maximum number of candidate PDCCUs that the UE can monitor and the maximum number of CCEs included in the entire search space (corresponding to the combined area of multiple search space sets). When the UE is configured with r16monitoringcapability as the value of monitoringCapabilityConfig-r16, the UE can define, for each span, the maximum number of candidate PDUs that the UE can monitor and the maximum number of CCEs included in the entire search space.

[0172] Condition 1: Limit on the maximum number of candidate PDCCHs

[0173] According to the configuration value of the high-layer signaling described above, when the maximum number M of candidate PDCCHs that the UE can monitor μ is defined based on the time slots in a cell with a subcarrier spacing of 15*2 μ kHz, the maximum number can conform to Table 11 shown below, and when the maximum number is defined based on the span, the maximum number can conform to Table 12 shown below.

[0174] [Table 11]

[0175] μ <![CDATA[Maximum number (M μ ) of PDCCH candidates per time slot and per serving cell 0 44 1 36 2 22 3 20

[0176] [Table 12]

[0177]

[0178] Condition 2: Limit on the maximum number of CCEs

[0179] According to the configuration value of the high-layer signaling described above, when the maximum number C of CCEs included in the entire search space μ is defined based on the time slots in a cell with a subcarrier spacing of 15*2 μ kHz, the maximum number can conform to Table 13 shown below, and when the maximum number is defined based on the span, the maximum number can conform to Table 14 shown below.

[0180] [Table 13]

[0181] μ <![CDATA[Maximum number of non-overlapping CCEs per time slot and per serving cell (C μ )]]> 0 56 1 56 2 48 3 32

[0182] [Table 14]

[0183]

[0184] For ease of description, the situation where conditions 1 and 2 are satisfied at a predetermined time point is defined as "Condition A". Therefore, the fact that Condition A is not satisfied means that at least one of Condition 1 and Condition 2 is not satisfied.

[0185] Rate matching / puncturing

[0186] When the time and frequency resources A for transmitting the symbol sequence A overlap with the time and frequency resources B, considering the resource C in the overlapping area of resources A and B, rate matching or puncturing can be regarded as an operation for transmitting or receiving channel A. The detailed operations are as follows.

[0187] Rate matching

[0188] The BS can map channel A only to the remaining resource area after excluding the area corresponding to the overlapping area of resource B from the entire resource A where the symbol sequence A is expected to be transmitted, and then transmit it to the UE. For example, when the symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the BS maps the symbol sequence A sequentially to the remaining resources {resource #1, resource #2, resource #4} after excluding {resource #3} corresponding to resource C from resource A, and can perform the transmission. Therefore, the BS can map the symbol sequence {symbol #1, symbol #2, symbol #3} to {resource #1, resource #2, resource #4} respectively, and can transmit this symbol sequence.

[0189] The UE can determine resources A and B based on the scheduling information associated with the symbol sequence A obtained from the BS, and thus can determine resource C as the overlapping area of resources A and B. The UE can assume that the symbol sequence A is mapped to the remaining area excluding resource C from the entire resource A and is transmitted, and can receive the symbol sequence A. For example, when the symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the UE can assume that the symbol sequence A is mapped sequentially to the remaining resources {resource #1, resource #2, resource #4} after excluding {resource #3} corresponding to resource C from resource A, and can receive this sequence. Therefore, the UE can assume that the symbol sequence {symbol #1, symbol #2, symbol #3} is mapped to {resource #1, resource #2, resource #4} respectively, and is transmitted, and can perform a series of subsequent receiving operations.

[0190] Puncturing

[0191] When a resource C corresponding to a region overlapping with resource B exists in the entire resource A in which it is desired to transmit the symbol sequence A to the UE, the BS may map the symbol sequence A to the entire resource A. However, the BS does not perform transmission in the resource region corresponding to resource C, but may perform transmission only in the resource region remaining after excluding resource C from resource A. For example, when the symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the BS may map the symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} to resource A {resource #1, resource #2, resource #3, resource #4} respectively, and may send only the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to {resource #1, resource #2, resource #4} remaining after excluding {resource #3} corresponding to resource C from resource A, but may not send {symbol #3} mapped to {resource #3} corresponding to resource C. Therefore, the BS may map the symbol sequence {symbol #1, symbol #2, symbol #4} to {resource #1, resource #2, resource #4} respectively, and may perform transmission.

[0192] The UE may determine resource A and resource B based on the scheduling information associated with the symbol sequence A obtained from the BS, and may thus determine resource C as the region where resource A and resource B overlap. The UE may assume that the symbol sequence A is mapped to the entire resource A, and transmit only in the remaining region excluding resource C from the entire resource A, and may receive the symbol sequence A. For example, when the symbol sequence A is configured with {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the UE may assume that the 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, and {symbol #3} mapped to {resource #3} corresponding to resource C is not transmitted, and may assume that the corresponding symbol sequence {symbol #1, symbol #2, symbol #4} is mapped to {resource #1, resource #2, resource #4} remaining after excluding {resource #3} corresponding to resource C from resource A and is transmitted, and may perform reception. Therefore, the UE may assume that the symbol sequence {symbol #1, symbol #2, symbol #4} is mapped to {resource #1, resource #2, resource #4} respectively and is transmitted, and may perform a series of subsequent reception operations.

[0193] Perform rate matching to adjust the size of a signal considering the amount of resources capable of transmitting the signal. For example, the rate matching of a data channel adjusts the size of the data relative to a predetermined time and frequency resource region, which is different from mapping and transmitting the data channel.

[0194] Figure 6 Illustrate a method for a BS and a UE to transmit or receive data considering a DL data channel and rate matching resources according to an embodiment.

[0195] In Figure 6 it, a PDSCH 601 and rate matching resources 602 are illustrated. The BS may configure one or more rate matching resources 602 via higher layer signaling (e.g., RRC signaling). In the configuration information of the rate matching resources 602, time domain resource allocation information 603, frequency domain resource allocation information 604, and period information 605 may be included. Hereinafter, a bitmap corresponding to the frequency domain resource allocation information 604 is referred to as a first bitmap, a bitmap corresponding to the time domain resource allocation information 603 is referred to as a second bitmap, and a bitmap corresponding to the period information 605 is referred to as a third bitmap. When all or part of the time and frequency resources for scheduling the data channel 601 overlap with the configured rate matching resources 602, the BS may perform rate matching of the data channel 601 in a part of the rate matching resources 602 and may perform transmission. Assuming that the data channel 601 is rate matched in a part of the rate matching resources 602, the UE may perform reception and decoding.

[0196] Via additional configuration, the BS may dynamically report to the UE via DCI (corresponding to the "rate matching indicator" of the DCI format described above) whether rate matching is performed on the data channel in the configured rate matching resource part. Specifically, the BS may select some of the configured rate matching resources, group them into rate matching resource groups, and may indicate to the UE via DCI according to a bitmap scheme for each rate matching resource group whether rate matching of the data channel is performed. For example, when 4 rate matching resources (RMRs), i.e., RMR#1, RMR#2, RMR#3, and RMR#4, are configured, the BS may configure rate matching groups, e.g., rate matching group (RMG)#1 = {RMR#1, RMR#2} and RMG#2 = {RMR#3, RMR#4}, and may indicate to the UE via a bitmap using 2 bits in the DCI field whether rate matching is performed in each of RMG#1 and RMG#2. For example, when rate matching needs to be performed, "1" is indicated, otherwise when rate matching is not required, "0" is indicated.

[0197] In 5G, as a method for configuring rate matching resources for a UE, the granularity of "RB symbol level" and "RE level" can be supported. In particular, the following configuration methods can be used.

[0198] At the RB symbol level

[0199] Up to four RateMatchPatterns for each BWP can be configured for the UE via higher layer signaling, and a single RateMatchPattern can include the following.

[0200] As reserved resources in the BWP, it can include the time and frequency resource regions of the corresponding reserved resources configured based on a combination of the RB-level bitmap and the symbol-level bitmap on the frequency axis. The reserved resources can span one or two time slots. A time domain pattern (periodicityAndPattern) can be additionally configured, in which the time and frequency resource regions configured using a pair of RB-level bitmap and symbol-level bitmap will repeat.

[0201] It can include the time domain and frequency domain resource regions where the CORESET is configured in the BWP, and the resource regions corresponding to the time domain pattern configured based on the search space configuration (the corresponding resource regions repeat).

[0202] At the RE level

[0203] The UE can be configured via higher layer signaling with the following.

[0204] As configuration information (Lte-CRS-ToMatchAround) associated with the RE corresponding to the LTE cell-specific RS or common RS (LTE CRS) pattern, it can include the number of ports of the LTE CRS (nrofCRS-Ports) and the LTE-CRS-vshift(s) value (v-shift), the position information (carrierFreqDL) of the central subcarrier of the LTE carrier based on the reference frequency point (e.g., reference point A), the bandwidth size (carrierBandwidthDL) information of the LTE carrier, and the subframe configuration information (mbsfn-SubframConfigList) corresponding to the multicast broadcast single frequency network (MBSFN), etc. Based on the information described above, the UE can determine the position of the CRS corresponding to the LTE subframe in the NR time slot.

[0205] It can include the configuration information associated with the resource set corresponding to a single zero-power (ZP) CSI-RS or multiple ZP CSI-RSs in the BWP.

[0206] PDSCH / PUSCH: Time resource allocation

[0207] The BS can configure a table associated with the time-domain resource allocation information of the PDSCH and the UE's PUSCH via high-layer signaling (e.g., RRC signaling). The BS can configure a table including up to 16 entries (maxNrofDL-Allocation = 16) associated with the PDSCH, and can configure a table including up to 16 entries (maxNrofUL-Allocation = 16) associated with the PUSCH. In an embodiment, the time-domain resource allocation information may include the PDCCH-to-PDSCH slot timing (the time interval based on slot units between the time point when the PDCCH is received and the time point when the PDSCH scheduled by the received PDCCH is transmitted, and represented by K0) or the PDCCH-to-PUSCH slot timing (the time interval based on slot units between the time point when the PDCCH is received and the time point when the PUSCH scheduled by the received PDCCH is transmitted, and represented by K2), the information associated with the position of the start symbol of the PDSCH or PUSCH scheduled in the slot and the length of the symbol, the PDSCH or PUSCH mapping type, etc. For example, information such as that shown in Table 15 or Table 16 below can be sent from the BS to the UE.

[0208] [Table 15]

[0209]

[0210] [Table 16]

[0211]

[0212] The BS can notify one of the entries in the table associated with the time-domain resource allocation information to the UE via L1 signaling (e.g., DCI) (e.g., via the "time-domain resource allocation" field in the DCI). The UE can obtain the time-domain resource allocation information associated with the PDSCH or PUSCH based on the DCI received from the BS.

[0213] Figure 8 Illustrates the time-domain resource allocation of the PDSCH in a wireless communication system according to an embodiment.

[0214] Refer to Figure 8 , the BS can indicate the position of the PDSCH resource on the time axis based on the subcarrier spacing (SCS) (μPDSCH, μPDCCH) of the data channel and the control channel configured via high layer, the scheduling offset (KO) value, and the start point 8-00 and length 8-05 of the OFDM symbols in a single slot dynamically indicated via the DCI.

[0215] Figure 9Shows the time-domain resource allocation according to the subcarrier spacing of the data channel and the control channel in a wireless communication system according to an embodiment.

[0216] Referring to Figure 9 , when the subcarrier spacing of the data channel is the same as that of the control channel (μPDSCH = μPDCCH), as Figure 9 shown in -00, the slot numbers for data and control are the same. Therefore, the BS and the UE can generate a scheduling offset based on a predetermined slot offset K0. On the contrary, when the subcarrier spacing of the data channel is different from that of the control channel (μPDSCH ≠ μPDCCH), as shown in 9-05 in the figure, the slot numbers for data and control are different. Therefore, the BS and the UE can generate a scheduling offset based on the predetermined slot offset K0 with reference to the subcarrier spacing of the PDCCH.

[0217] PDSCH: Frequency resource allocation

[0218] Figure 7 Shows the frequency-domain resource allocation of the PDSCH in a wireless communication system according to an embodiment.

[0219] Figure 7 Is a diagram illustrating three types (i.e., type 0 7-00, type 1 7-05, and dynamic switching 7-10) of frequency-domain resource allocation methods that can be configured via a higher layer in an NR wireless communication system.

[0220] Referring to Figure 7 , when the UE is configured via higher layer signaling to use only resource type 0 (7-00 shown in the figure), some DCIs for allocating the PDSCH to the corresponding UE may include a bitmap configured with NRBG bits. The above conditions will be described later. In this case, the NRBG is the number of resource block groups (RBGs) determined based on the BWP size indicated by the BWP indicator and the higher layer parameter rbg-Size (rgb size), as shown in Table 17 below, and the data is transmitted in the RBGs indicated by 1 in the bitmap.

[0221] [Table 17]

[0222]

[0223]

[0224] When the UE is configured via higher layer signaling to use only resource type 1 (7-05 shown in the figure), some DCIs for allocating the PDSCH to the corresponding UE may include containing Frequency domain resource allocation information for bits. The above conditions will be described later. Based on this, the BS can configure the starting VRB 7-20 and the length 7-25 of the frequency domain resources continuously allocated starting from the starting VRB 7-20.

[0225] When the UE is configured via higher layer signaling to use both resource type 0 and resource type 1 (7-10 shown in the figure), some DCIs for allocating the PDSCH to the corresponding UE may include frequency domain resource allocation information, which is configured with a payload 7-15 for configuring resource type 0 and a payload with a higher value 7-35 among the payloads 7-20 and 7-25 for configuring resource type 1. The above conditions will be described later. In this case, one bit can be added to the most significant bit (MSB) of the frequency domain resource allocation information in the DCI. When the corresponding bit is "0", this can indicate that resource type 0 will be used, and when the corresponding bit is "1", this can indicate that resource type 1 will be used.

[0226] PDSCH: Phase Tracking RS (PTRS) When receiving the PDSCH from the BS, the UE can receive the PTRS for tracking the phase associated with the DL channel. For the UE, the phaseTrackingRS, as a higher layer signaling parameter for the PTRS, can be configured in the DMRS-DownlinkConfig, which is a higher layer signaling parameter. When the BS configures the phaseTrackingRS for the UE via higher layer signaling parameters, the resources for transmitting the PTRS in the frequency domain and time domain can be configured via frequencyDensity (frequency density) and timeDensity (time density). In the case of the UE, the frequencyDensity in the PTRS-DownlinkConfig, as a higher layer signaling parameter, can indicate NRB0 or NRB1, and the timeDensity can indicate ptrs-MCS1 or ptrs-MCS3. The UE can determine the PTRS density (LPT-RS) in the time domain and the PTRS density (KPT-RS) in the frequency domain according to the MCS (IMCS) and NRB of the scheduled PDSCH, as shown in Table 18 and Table 19 below. In Table 18 below, although ptrs-MCS4 is not mentioned as a higher layer parameter, the BS and the UE can realize that it is 29 or 28 according to the configured MCS table. In Table 19 below, the NRB is the number of RBs scheduled for the PDSCH.

[0227] [Table 18]

[0228] Scheduled MCS <![CDATA[Time density (L PT-RS )]]> <![CDATA[I MCS <ptrs-MCS1]]> PT-RS does not exist <![CDATA[ptrs-MCS1≤I MCS <ptrs-MCS2]]> 4 <![CDATA[ptrs-MCS2≤I MCS <ptrs-MCS3]]> 2 <![CDATA[ptrs-MCS3≤I MCS <ptrs-MCS4]]> 1

[0229] [Table 19]

[0230] Scheduled bandwidth <![CDATA[Frequency density (K PT-RS )]]> <![CDATA[N RB <N RB0 > PT-RS does not exist <![CDATA[N RB0 ≤NRB < N RB1 > 2 <![CDATA[N RB1 ≤NRB]]> 4

[0231] The DMRS configured by the BS and the associated PTRS can be mapped to the same subcarrier positions, and the same precoding can be assumed for the antenna ports of the DMRS and the PTRS. For the UE, a single PTRS antenna port for receiving the PTRS is defined, and the PTRS antenna port can be associated with the DMRS antenna port based on the codeword. When a single codeword is transmitted, the PTRS antenna port can be associated with the DMRS antenna port with the lowest index, and when two codewords are transmitted, the PTRS antenna port can be associated with the DMRS antenna port with the lowest index of the scheduled codeword with the higher MCS.

[0232] PRB bundling

[0233] The BS can determine the configuration of the precoding granularity in the frequency domain for the UE in units of consecutive resource blocks (i.e., based on the PRB bundling size unit P′ BWP，i ).

[0234] When the PRB bundling size P′ BWP，i is determined to be "wideband", the UE may not expect non - consecutive PRB scheduling, and the UE can apply the assumption of the same precoding, TCI state, or QCL to the allocated frequency resources. When P′ BWP，i is determined to be one of {2, 4}, the i - th BWP can be configured with a PRG including P′ BWP，i consecutive PRBs.

[0235] In this case, regarding the start point and end point of the BWP, the actual number of consecutive PRBs included in the PRG may be less than the PRG size P′ BWP，i . That is, the size of the BWP in the frequency domain may not be evenly divided by the PRG size. Therefore, the PRG at the start point of the BWP can be configured with PRBs. Associated with the size of the PRG at the end point of the BWP, when is greater than 0, the size of the PRG can be determined as When is 0, the size of the PRG can be determined as P′ BWP，i . In this case, the UE can assume that the same precoding is applied to the consecutive DL PRBs in the PRG.

[0236] Based on the configuration and / or indication information from the BS, the UE can determine the PRG size P′ BWP，i . When the BS schedules the PDSCH for the UE by DCI format 1_0 or DCI format 4_0, the UE can assume the PRG size P′ BWP，iIt is 2. When the prb_BundlingType in the high-layer signaling information PDSCH-Config from the BS is not configured for the UE and the PDSCH is scheduled via DCI format 1_1, the UE may assume the PRG size P′ BWP，i It is 2. When the prb-BundlingType in the high-layer signaling information PDSCH-Config from the BS is configured as "staticBundling (static bundling)" for the UE, the UE may determine the single value indicated by the bundliSzie (bundling size) in the high-layer signaling information PDSCH-Config as the PRG size P′ BWP，i .

[0237] When the prb-BundlingType in the high-layer signaling information PDSCH-Config from the BS is configured as "dynamicBundling (dynamic bundling)" for the UE, the bundleSizeSet1 and bundleSizeSet2 can be configured for the UE in the high-layer signaling information PDSCH-Config, and the PRG size P′ included in each bundleSizeSet BWP，i can have one or two values from {2, 4, wideband}. The method by which the UE receives an indication associated with the PRG size from the BS via DCI format 1_1 can be as follows. When the "bundling size indicator" in DCI format 1_1 from the BS indicates 0 to the UE, the UE can apply P′ BWP，i from the second set (bundleSizeSet2) of the set of (i.e., bundleSizeSet1 and bundleSizeSet2) of PRG sizes P′ BWP，i to receive the PDSCH. When the "bundling size indicator" in DCI format 1_1 from the BS indicates 1 to the UE, the UE can apply P′ via bundleSizeSet1 BWP，i to perform the reception. In this case, there may be combinations included in bundleSizeSet1, and the combinations may vary according to the following situations.

[0238] When the size of bundleSizeSet1 is 1 (i.e., the number of values included in bundleSizeSet1 is 1), n4 or wideband can be configured in bundleSizeSet1.

[0239] When the size of bundleSizeSet1 is 2 (i.e., the number of values included in bundleSizeSet1 is 2), {n2 - wideband} or {n4 - wideband} can be configured in bundleSizeSet1.

[0240] When consecutive PRBs are scheduled and the number of scheduled PRBs is greater than , the number of scheduled RBs, i.e., the bandwidth, can be applied. Otherwise, 2 or 4 can be applied.

[0241] CA / DC

[0242] Figure 10 Shows the radio protocol structures of the BS and UE in a single-cell scenario, a carrier aggregation scenario, and a dual-connection scenario according to an embodiment.

[0243] Referring to Figure 10 , for each of the UE and the NR BS, the radio protocol of the next-generation mobile communication system may include an NR Service Data Adaptation Protocol (NR SDAP) S25 and S70, an NR Packet Data Convergence Protocol (NR PDCP) S30 and S65, an NR Radio Link Control (NR RLC) S35 and S60, and an NR Medium Access Control (NR MAC) S40 and S55.

[0244] The main functions of NR SDAP S25 and S70 may include the transmission of user-plane data, the mapping between QoS flows and DRBs for DL and UL, and the marking of QoS flow IDs in DL and UL packets.

[0245] Reflective QoS flow for DRB mapping of UL SDAP PDUs

[0246] For the UE, via an RRC message, it can be configured whether to use the header of the SDAP layer device or whether to use the functions of the SDAP layer device, for each PDCP layer device, for each bearer, or for each logical channel, in association with the SDAP layer device. When the SDAP header is configured, the NAS-reflective QoS configuration one-bit indicator (NAS-reflective QoS) and the AS-reflective QoS configuration one-bit indicator (AS-reflective QoS) of the SDAP header can provide indications for the UE to update or reconfigure the mapping information between QoS flows and data bearers in UL and DL. The SDAP header may include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority information, scheduling information, etc. to support smooth services.

[0247] The main functions of NR PDCP S30 and S65 may include at least one of the following functions: only ROHC, the transmission of user data, sequential transmission (sequential transmission of upper-layer PDUs), unordered transmission (unordered transmission of upper-layer PDUs), reordering (reordering of received PDCP PDUs), duplicate detection of lower-layer SDUs, retransmission of PDCP SDUs, encryption and decryption, and timer-based SDU discard in UL.

[0248] The reordering function of the mentioned NR PDCP device reorders the PDCP PDUs received in the lower layer in the order of the PDCP sequence number (PDCP SN), and may include delivering data to the upper layer in the reordered sequence. The reordering function of the NR PDCP device may include delivering data immediately regardless of the order, recording the lost PDCP PDUs after reordering them sequentially, reporting the status of the lost PDCP PDUs to the sending side, and requesting retransmission of the lost PDCP PDUs.

[0249] The main functions of NR RLC S35 and S60 may include at least one of transmission of upper layer PDUs, sequential transmission (sequential transmission of upper layer PDUs), unordered transmission (unordered transmission of upper layer PDUs), error correction by ARQ, concatenation of RLC SDUs, segmentation and reassembly, re-segmentation of RLC data PDUs, reordering of RLC data PDUs, duplicate detection, protocol error detection, RLC SDU discard, and RLC reconstruction.

[0250] The sequential transfer function of the mentioned NR RLC device sequentially transfers the RLC SDUs received from the lower layer to the upper layer. When a single original RLC SDU is divided into multiple RLC SDUs and multiple RLC SDUs are received, the sequential transfer function of NR RLC may include reassembling and sending them. The sequential transfer function of the NR RLC device may include reordering the received RLC PDUs according to the RLC sequence number (RLC SN) or the PDCP sequence number (PDCP SN), recording the lost RLC PDUs after sequential reordering, reporting the status of the lost RLC PDUs to the sending side, and requesting retransmission of the lost RLC PDUs. The sequential transfer function of the NR RLC device may include: when there are lost RLC SDUs, only sequentially transferring the RLC SDUs before the lost RLC SDUs to the upper layer. When a predetermined timer expires, even if there are lost RLC SDUs, the sequential transfer function may include sequentially transferring the RLC SDUs received before the timer starts to the upper layer. Alternatively, the sequential transfer function of the NR RLC device may include: when a predetermined timer expires, even if there are lost RLC SDUs, sequentially transferring all the received RLC SDUs up to the current time to the upper layer. In addition, the RLC PDUs are processed in the order of reception (in the order of arrival, regardless of the sequence number or serial number) and are sent to the PDCP device regardless of the order (unordered transfer). In the case of segmentation, the segments stored in the buffer or to be received in the future are received and reconfigured into a single complete RLC PDU, and after being processed, are sent to the PDCP device. The NR RLC layer may not include a concatenation function, or may perform the function in the NR MAC layer or replace the concatenation function with the multiplexing function in the NR MAC layer.

[0251] The unordered transfer function of the NR RLC device immediately transfers the RLC SDUs received from the lower layer to the upper layer, regardless of the order. When a single original RLC SDU is divided into multiple RLC SDUs and multiple RLC SDUs are received, the unordered transfer function may include reassembling and sending them, storing the RLC SN or PDCP SN of the received RLC PDUs, performing sequential sorting, and recording the lost RLC PDUs.

[0252] NR MAC S40 and S55 can be connected to multiple NR RLC layer devices configured for a single UE, and the main functions of NR MAC can include at least one of mapping between logical channels and transport channels, multiplexing and demultiplexing of MAC SDUs, scheduling information reporting, error correction via HARQ, priority handling between logical channels of one UE, priority handling between UEs via dynamic scheduling, MBMS service identification, transport format selection, and padding.

[0253] NR PHY layer S45 and S50 can perform channel coding and modulation on the high-layer data to generate OFDM symbols, and transmit the OFDM symbols via a radio channel, or can perform demodulation and channel decoding on the OFDM symbols received via the radio channel, and send the demodulated and channel-decoded OFDM symbols to the high layer.

[0254] The detailed structure of the radio protocol structure can be changed differently according to the carrier (or cell) operation scenario. For example, when the BS sends data to the UE based on a single carrier (or cell), the BS and the UE can use a protocol structure with a single structure for each layer, such as S00 shown in the figure. In contrast, when the BS sends data to the UE based on CA using multiple carriers in a single transmit and receive point (TRP), the BS and the UE can use a protocol structure with a single structure up to the RLC, and perform PHY layer multiplexing via the MAC layer, such as S10 shown in the figure. As another example, when the BS sends data to the UE based on dual connectivity (DC) using multiple carriers in multiple TRPs, the BS and the UE can use a protocol structure with a single structure up to the RLC, but perform PHY layer multiplexing via the MAC layer, such as S20 shown in the figure.

[0255] Referring to the PDCCH and the description related to beam configuration described above, repeated PDCCH transmission is not currently supported in Release (Rel)-15 and Rel-16 NR. Therefore, it is difficult to obtain the required reliability in cases that require high reliability such as URLLC. The present disclosure provides a method for repeated PDCCH transmission through multiple transmission points (TRPs) to improve the PDCCH reception reliability of the UE. The method will be described in detail in the following embodiments.

[0256] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The content provided in the present disclosure can be applied to FDD and TDD systems. Hereinafter, the higher-layer signaling (or high-layer signaling) is a signal transmitted from the BS to the UE via the DL data channel of the physical layer, or a signal transmitted from the UE to the BS via the UL data channel of the physical layer, which can also be referred to as RRC signaling, PDCP signaling, or MAC control element (CE).

[0257] In this document, when determining whether to apply cooperative communication, the UE can use various methods, such as: a method in which the PDCCH allocating the PDSCH for applying cooperative communication has a predetermined format, a method in which the PDCCH allocating the PDSCH for applying cooperative communication includes a predetermined indicator indicating whether to apply cooperative communication, a method in which the PDCCH allocating the PDSCH for applying cooperative communication is scrambled by a predetermined RNTI, a method of assuming the application of cooperative communication at a predetermined interval indicated via a higher layer, etc. For ease of description, when the UE receives the PDSCH for applying cooperative communication based on conditions similar to the above, it is referred to as the NC-JT case.

[0258] In this document, there can be various descriptions for determining the priorities of A and B, such as the case of selecting the one with the higher priority according to a predetermined priority rule and performing the corresponding operation, or the case of ignoring or discarding the one with the lower priority, etc.

[0259] Although the present disclosure describes various examples through multiple embodiments, these embodiments are not independent of each other, but one or more embodiments can be applied together or in parallel.

[0260] SBFD

[0261] In 3GPP, SBFD has been discussed as a new duplex scheme based on NR. In the TDD band (spectrum) of 6 GHz or lower frequency or 6 GHz or higher frequency, SBFD can receive as much UL transmission from the UE as the UL resources increased by using some DL resources as UL resources, and can extend the UL coverage of the UE, and can receive feedback on the DL transmission in the extended UL resources from the UE to reduce the feedback delay. In the present disclosure, a UE that can receive information associated with whether SBFD is supported from the BS and perform UL transmission in a part of the DL resources (or a UE having relevant capabilities and capable of reporting the capabilities to the BS) is referred to as an SBFD UE (a UE with SBFD capabilities). In order to define the SBFD scheme in the standard and enable the SBFD UE to determine whether SBFD is supported in a predetermined cell (or frequency band), the following schemes can be considered.

[0262] In the first scheme, in addition to the existing frame structure types of unpaired spectrum (or time division duplex (TDD)) or paired spectrum (or frequency division duplex (FDD)), another frequency structure type (e.g., frame structure type 2) can be introduced to define SBFD. Frame structure type 2 can define the support of SBFD in a predetermined frequency or frequency band, or the BS can indicate to the UE via system information whether SBFD is supported. The SBFD UE can receive the system information including whether SBFD is supported and can determine whether SBFD is supported in a predetermined cell (or frequency, frequency band).

[0263] In the second solution, without defining a new frame structure type, it can be indicated whether SBFD is additionally supported in a predetermined frequency or frequency band of the existing unpaired spectrum (or TDD). In the second solution, it can be defined whether SBFD is additionally supported in a predetermined frequency or frequency band of the existing unpaired spectrum, or the BS can indicate to the UE via system information whether SBFD is supported. The SBFD UE can receive the system information including whether SBFD is supported and can determine whether SBFD is supported in a predetermined cell (or frequency, frequency band).

[0264] In the first and second solutions, in addition to the configuration associated with the TDD UL-DL resource configuration information indicating the DL time slot (or symbol) resources and UL time slot (or symbol) resources of TDD, the information associated with whether SBFD is supported can be information that indirectly (or implicitly) indicates whether SBFD is supported by configuring a part of the DL resources as UL resources (for example, the SBFD resource configuration information described in Figure 11 ), or can be information that directly (or explicitly) indicates whether SBFD is supported.

[0265] The SBFD UE can receive the SS block (i.e., SS / PBCH block) and can obtain cell synchronization at the initial cell access for accessing the cell (or BS). The process of obtaining cell synchronization can be the same between the SBFD UE and the existing TDD UE (or the UE without SBFD capability). Subsequently, the SBFD UE can determine whether the cell supports SBFD by obtaining the MIB or SIB or via the random access procedure.

[0266] The system information for sending the information associated with whether SBFD is supported can be system information that is different from and separately sent from the system information of the UE (such as the existing TDD UE) supporting different versions of the standard in the cell. The SBFD UE can determine all or part of the system information separately sent from the system information of the existing TDD UE and can determine whether SBFD is supported in the corresponding cell. When the SBFD UE only obtains the system information of the existing TDD UE or obtains the system information indicating that SBFD is not supported, the SBFD UE can determine that the cell (or BS) only supports TDD.

[0267] When the information associated with whether SBFD is supported is included in the system information of a UE (e.g., an existing TDD UE) that supports different versions of standards, the information associated with whether SBFD is supported can be inserted into the last part of the system information so as not to affect the existing TDD UE's acquisition of the system information. When the SBFD UE fails to acquire the information associated with whether SBFD is supported inserted into the last part, or acquires information indicating that SBFD is not supported, the SBFD UE can determine that the cell (or BS) only supports TDD.

[0268] When the information associated with whether SBFD is supported is included in the system information of a UE (e.g., an existing TDD UE) that supports different versions of standards, the information associated with whether SBFD is supported can be sent via a separate PDSCH so as not to affect the existing TDD UE's acquisition of the system information. That is, a UE without SBFD capability can receive a first SIB including existing TDD-related system information via a first PDSCH. A UE with SBFD capability can receive a first SIB including existing TDD-related system information via a first PDSCH, and can receive a second SIB including SBFD-related system information via a second PDSCH different from the first PDSCH. The first PDSCH and the second PDSCH can be scheduled via a first PDCCH and a second PDCCH respectively, and the cyclic redundancy code (CRC) of the first PDCCH and the second PDCCH can be scrambled by the same RNTI (e.g., SI-RNTI). The search space for monitoring the second PDCCH can be obtained from the system information of the first PDSCH. When the UE does not obtain the information associated with the search space for monitoring the second PDCCH from the system information of the first PDSCH (i.e., when the system information of the first PDSCH does not include the information associated with the search space), the UE can receive the second PDCCH in the same search space as the search space of the first PDCCH.

[0269] When the SBFD UE determines that the cell (or BS) only supports TDD, the SBFD UE can perform the random access procedure and data / control signal transmission or reception in the same manner as an existing TDD UE.

[0270] The BS can configure random access resources for each of the existing TDD UEs or SBFD UEs (e.g., SBFD UEs supporting duplex communication and SBFD UEs supporting half-duplex communication) separately, and can send the configuration information of the random access resources (control information or configuration information indicating the time-frequency resources available for the PRACH) to the SBFD UEs via system information. The system information for sending information associated with the random access resources can be system information that is different from and sent separately from the system information of UEs (e.g., existing TDD UEs) supporting different versions of the standard in the cell.

[0271] The BS configures random access resources for SBFD UEs and TDD UEs supporting different versions of the standard separately, and can distinguish whether the one performing random access is a TDD UE (performing random access) or an SBFD UE supporting different versions of the standard. For example, the random access resources configured separately for the SBFD UE can be resources that the existing TDD UE identifies as DL time resources, and the SBFD UE can perform random access via UL resources (or separate random access resources) configured in a part of the frequency of the DL time resources, and the BS determines that the UE attempting random access in the UL resources is an SBFD UE.

[0272] Alternatively, the BS may not configure random access resources separately for the SBFD UEs, but may configure random access resources commonly for all UEs in the cell. In this case, the configuration information for the random access resources can be sent to all UEs in the cell via system information, and the SBFD UEs receiving the system information can perform random access in the random access resources. Subsequently, the SBFD UE can complete the random access procedure and can enter the RRC connected mode for performing data transmission or reception with the cell. After the RRC connected mode, the SBFD UE can receive a higher layer signal or a physical signal from the BS that can determine the configuration of a part of the frequency resources of the DL time resources configured as UL resources, and can perform operations related to the SBFD (e.g., transmission of UL signals in the UL resources).

[0273] When the SBFD UE determines that the cell supports SBFD, the SBFD UE can notify the BS that the UE attempting to access is an SBFD UE by sending capability information, where the sent capability information includes at least one piece of information among information associated with whether the UE supports SBFD, information associated with whether it supports full-duplex communication or half-duplex communication, the number of transmit antennas equipped (or supported) by the UE, or the number of receive antennas equipped (or supported) by the UE. Alternatively, when it is necessary for the SBFD UE to support half-duplex communication, whether it supports half-duplex communication can be omitted from the capability information. In association with the reporting of the capability information by the SBFD UE, the capability information can be reported to the BS via a random access procedure, can be reported to the BS after the completion of the random access procedure, or can be reported to the BS after executing an RRC access mode for data transmission or reception with the cell.

[0274] The SBFD UE can support half-duplex communication that only performs UL transmission or DL reception at the same moment, like an existing TDD UE, or can support full-duplex communication that simultaneously performs UL transmission and DL reception at the same moment. Therefore, whether it supports half-duplex communication or full-duplex communication can be reported by the SBFD UE to the BS via a capability report, and after the reporting, the BS can configure for the SBFD UE whether to use half-duplex communication or full-duplex communication when the SBFD UE performs transmission or reception. When the SBFD UE reports the capability associated with half-duplex communication to the BS, since there is generally no duplexer, a switching gap for changing the RF between transmission and reception may be required when operating in FDD or TDD.

[0275] Figure 11 FIG. is a diagram showing an example of SBFD operating in a TDD band of a wireless communication system according to an embodiment.

[0276] Figure 11 Part (a) in shows when TDD operates in a predetermined band. Based on the configuration associated with the TDD UL-DL resource configuration information indicating the DL time slot (or symbol) resource and UL time slot (or symbol) resource of TDD, the BS in the cell operating TDD can perform signal transmission or reception including data / control information with an existing TDD UE or an SBFD UE in the DL time slot (or symbol), UL time slot (or symbol) 1101, or flexible time slot (or symbol).

[0277] In Figure 11In part (a), it is assumed that the DDDSU time slot format is configured based on the TDD UL-DL resource configuration information. "D" represents a time slot configured with all DL symbols. "U" represents a time slot configured with all UL symbols. "S" is a time slot different from "D" or "U", that is, a time slot including DL symbols or UL symbols or including flexible symbols. For the sake of description, it is assumed that S is configured with 12 DL symbols and 2 flexible symbols. The DDDSU time slot format can be repeated according to the TDD UL-DL resource configuration information. That is to say, the repetition period of the TDD configuration can be 5 time slots (5 ms in the case of 15 kHz SCS, 2.5 ms in the case of 30 kHz SCS, etc.).

[0278] In Figure 11 part (b), for the UE, a part of the cell's frequency band can be configured as the UL transmission available frequency band 1110. This frequency band can be referred to as the UL sub-band. The UL sub-band can be applied to all symbols of all time slots. The UE can transmit the UL channel or signal scheduled in the UL sub-band in all symbols 1112. However, the UE may not be able to transmit the UL channel or signal in a frequency band different from the UL sub-band.

[0279] In Figure 11 part (c), for the UE, a part of the cell's frequency band can be configured as the UL transmission available frequency band 1120, and the time domain in which this frequency band is activated can be configured. This frequency band can be referred to as the UL sub-band. In Figure 11 C, the UL sub-band can be deactivated in the first time slot, and the UL sub-band can be activated in the remaining time slots. Therefore, the UE can transmit the UL channel or signal in the UL sub-band 1122 in the remaining time slots when the UL sub-band is activated. In Figure 11 part (c), although the UL sub-band is activated in units of time slots, whether the UL sub-band is activated / deactivated can be configured in units of symbols included in the time slots.

[0280] In Figure 11 part (d), the time-frequency resources available for UL transmission can be configured for the UE. The UE can be configured to have one or more time-frequency resources as the time-frequency resources available for UL transmission. For example, a part of the frequency band 1132 of the first time slot and the second time slot can be configured as the time-frequency resources available for UL transmission. In addition, a part of the frequency band 1133 of the third time slot and a part of the frequency band 1134 of the fourth time slot can be configured as the time-frequency resources available for UL transmission.

[0281] In this document, the time-frequency resources available for UL transmission in a DL symbol or time slot can be referred to as SBFD resources. The symbol configured with a UL subband in a DL symbol can be referred to as an SBFD symbol. The time-frequency resources available for DL reception in a UL symbol or time slot can be referred to as SBFD resources. The symbol configured with a DL subband in a UL symbol can be referred to as an SBFD symbol.

[0282] For ease of description, the frequency band excluding the UL subband and capable of receiving a DL channel or signal can be denoted as a DL subband. For a UE, in a single symbol, the maximum value of a single UL subband can be configurable, and the maximum value of two DL subbands can be configurable. For example, a UE can be configured in the frequency domain with one of a UL subband and a DL subband, a DL subband and a UL subband, or a first DL subband, a UL subband, and a second DL subband.

[0283] The PRG grid for the UE to receive the PDSCH can be determined based on the start point and size of the DL BWP and the PRB bundling-related configuration information received by the UE from the BS. In this case, the UE may need to determine the RPG grid in the SBFD symbol / slot with a UL subband and in the DL-only symbol / slot. Due to the presence of a UL subband in the SBFD symbol / slot, in the frequency resource region excluding the start point and end point of the DL BWP, the PRG may not be evenly divided into the configured PRB size, which is a drawback.

[0284] The BS can send information to the UE for configuring the frequency density related to PTRS transmission, and the frequency density of the PTRS can be determined based on the size of the scheduled PRB. However, in the SBFD symbol / slot, fewer DL frequency resources used as UL subbands may be used compared to the DL-only symbol / slot, so the size of the actually used scheduled PRB can be different. When the size of the scheduled PRB in the SBFD symbol / slot is interpreted as the same as that in the DL-only symbol / slot, the frequency density of the PTRS may be determined to be unsuitable for the SBFD symbol / slot.

[0285] Therefore, methods for determining the PRG grid considering the UL subband, methods for determining the size of the scheduled PRB in the SBFD symbol / slot, methods for interpreting the DL BWP size, and methods for assuming precoding when broadband PRB bundling is configured are disclosed in this document, etc.

[0286] Figure 12 A method for determining a PRG grid for a scheduled PRB according to an embodiment is shown.

[0287] Refer to Figure 12, the UE can receive the DL BWP configuration from the BS via high-layer configuration information, and the DL BWP configuration can configure the starting point of the BWP and the BWP size in terms of PRBs In Figure 12 , the DL BWP configuration sent by the BS to the UE can indicate and Therefore, the UE and the BS can determine the ending point of the BWP as The UE and the BS can determine the PRG grid based on the PRB bundling size (i.e., PRB bundling granularity) configured according to the BWP configuration described above and the UL layer configuration information, and Figure 12 The example of shows the case where the PRB bundling size is set to 2. Through the configuration information, the PRG grid between the UE and the BS can be configured based on every two PRBs, and the starting point of the BWP that is not evenly divided by the PRB bundling size can be determined as

[0288] When the SBFD system considers the UL sub-bands, there may be ambiguity when performing the PRG grid determination method. For example, when the frequency resources of the UL sub-band are configured to align with the starting point of the existing PRG 1 and the ending point of the PRG 2, as shown in the case of the UL sub-band 11210 (i.e., when the starting point or the ending point of the UL sub-band frequency resources aligns with the boundary between different PRGs included in the PRG grid), there may be no problem in the PRG grid determination method. However, when the UL sub-band frequency resources are configured as shown in the case of the UL sub-band 2 1211 and do not align with the existing PRG grid (i.e., when the starting point or the ending point of the UL sub-band frequency resources does not align with the boundary between different PRGs included in the PRG grid), there may be ambiguity when the UE and the BS determine the PRG grid. In the following embodiments, a method to overcome this drawback can be provided.

[0289] The first embodiment: A method for determining whether the UL sub-band aligns with the PRG grid when configuring the UL sub-band

[0290] The UE can determine the PRG grid considering the UL sub-band by performing a modulo operation based on the UL sub-band frequency resource configuration received from the BS. The UE can receive the configuration information related to the BWP and the PRB bundling size from the BS via high-layer configuration information. In the SBFD system, the UE can receive the configuration information associated with the UL sub-band frequency resources separately. In this case, in order to determine the PRG grid, the UE can perform a modulo operation based on the received UL sub-band frequency resource configuration information.

[0291] The detailed method for the UE to determine the PRG grid by using the UL sub-band frequency resource configuration information received from the BS is described as follows. When the result value of the modulo operation performed by the UE on the start point of the UL sub-band and the PRB bundling size is 0 (for example, ), and the result value of the modulo operation performed by the UE on the end point of the UL sub-band and the PRB bundling size is 0 (for example, ), the UE can determine that the frequency resource of the UL sub-band is aligned with the PRG grid. When the result value of the modulo operation performed by the UE on the start point of the UL sub-band and the PRB bundling size is not 0 (for example, ), and the result value of the modulo operation performed by the UE on the start point, end point, and PRB bundling size of the UL sub-band is not 0 (for example, ), the UE can determine that the frequency resource of the UL sub-band is not aligned with the PRG grid.

[0292] Figure 13 The method for configuring the UL sub-band frequency resource aligned with the PRG grid according to an embodiment is shown.

[0293] Referring to Figure 13 , the UE can receive high-layer configuration information from the BS. The high-layer configuration information received by the UE from the BS may include DL BWP configuration, and for example, the information for configuring the DL BWP may indicate the start point of the BWP and the BWP size in terms of PRBs In Figure 13 , the DL BWP configuration received by the UE indicates and and the UE can identify the end point of the BWP as The UE can determine the PRG grid based on the PRB bundling size (e.g., PRB bundling granularity) configured according to the BWP configuration received from the BS and the high-layer configuration information. In Figure 13 , it is assumed that the PRB bundling size is set to 2. In addition, the high-layer configuration information sent by the BS to the UE may include the configuration information associated with the UL sub-band frequency resource, and the configuration information associated with the UL sub-band frequency resource may indicate the start point of the UL sub-band as and may indicate the size of the UL sub-band as Therefore, the UE can identify the end point of the UL sub-band as As described above, the UE can identify that the result obtained by performing a modulo operation on the start point of the UL sub-band and the PRB bundling size (i.e., ) is 0, and can identify that the result obtained by performing a modulo operation on the end point of the UL sub-band and the PRB bundling size (i.e., ) is 0. Therefore, the UE can determine that the configured UL sub-band is aligned with the PRG grid

[0294] Figure 14 A method for showing UL sub-band frequency resources whose configuration does not align with the PRG grid according to an embodiment.

[0295] Reference Figure 14 , a UE can receive high-layer configuration information from a BS. The high-layer configuration information received by the UE from the BS may include DL BWP configuration, and for example, the information for configuring the DL BWP may indicate the start point of the BWP and the BWP size in terms of PRBs In Figure 14 , the DL BWP configuration received by the UE indicates and and the UE can identify the end point of the BWP as The UE can determine the PRG grid based on the PRB bundle size (e.g., PRB bundle granularity) configured according to the BWP configuration received from the BS and the high-layer configuration information. In Figure 14 , it is assumed that the PRB bundle size is set to 2. In addition, the high-layer configuration information sent by the BS to the UE may include configuration information associated with the UL sub-band frequency resources, and the configuration information associated with the UL sub-band frequency resources may indicate the start point of the UL sub-band as and indicate the size of the UL sub-band as Therefore, the UE can identify the end point of the UL sub-band as As described above, the UE can identify that the result obtained by performing a modulo operation on the start point of the UL sub-band and the PRB bundle size (i.e., ) is not 0, and can identify that the result obtained by performing a modulo operation on the end point of the UL sub-band and the PRB bundle size (i.e., ) is not 0. Therefore, the UE can determine that the configured UL sub-band does not align with the PRG grid.

[0296] According to the method provided in this embodiment, although no separate explicit signaling is provided between the BS and the UE, the UE can determine whether the UL sub-band aligns with the PRG grid. The BS can implicitly notify the UE whether the UL sub-band aligns with the PRG grid without the signaling overhead of sending separate information to the UE. Through the above description, the burden of signaling overhead in the SBFD system can be reduced.

[0297] Second embodiment: A method for determining the PRG size considering UL sub-band frequency resources

[0298] The UE can determine the PRG size based on the configuration information received from the BS, taking into account the result obtained by determining whether the UL sub-band frequency resource is aligned with the PRG grid. The UE can receive the DL BWP, PRB bundling size, and UL sub-band configuration information from the BS via higher layer signaling, and can determine whether the PRG grid and the UL sub-band are aligned based on the received configuration information. In this case, for one or more PRGs excluding the start point and the end point of the DL BWP, the UE can determine the PRG size based on whether the PRG grid and the UL sub-band frequency resource are aligned with each other.

[0299] [Method 2-1: Method for determining the PRG size when the PRG grid is not aligned with the UL sub-band]

[0300] The UE can perform a modulo operation on the UL sub-band frequency resource and the PRB bundling size by using the configuration information received from the BS, and can determine the PRG grid size at the point where the PRG grid and the UL sub-band are not aligned with each other based on the result obtained by performing the modulo operation. Specifically, the fact that the PRG grid and the UL sub-band frequency resource are not aligned may mean the following three cases.

[0301] In Case 1, the start point of the UL sub-band frequency resource is not aligned with the PRG grid.

[0302] In Case 2, the end point of the UL sub-band frequency is not aligned with the PRG grid.

[0303] In Case 3 that satisfies both Case 1 and Case 2, the start point and the end point of the UL sub-band frequency resource are not aligned with the PRG grid.

[0304] Based on the result obtained by performing a modulo operation by using the frequency resource of the UL sub-band and the PRB bundling size configuration information, the UE can determine the PRG size for each of the above cases.

[0305] In Case 1, for a predetermined PRG close to the start point of the UL sub-band, the UE can determine the size of the PRG as

[0306] In Case 2, for a predetermined PRG close to the end point of the UL sub-band, the UE can determine the size of the corresponding PRG as

[0307] In Case 3, for a PRG close to the start point of the UL sub-band, the UE can determine the size of the corresponding PRG as And for a PRG close to the end point of the UL sub-band, the UE can determine the size of the corresponding PRG as In this case, the PRG size corresponding to the portion remaining after excluding the start point and the end point of the DL BWP may be the same as the PRB bundling size (P′) configured via higher layer signaling. BWP，i )same.

[0308] Figure 15 A method of determining the size of a PRG according to an embodiment is shown.

[0309] refer to Figure 15 , the UE may receive high-level configuration information from the BS, and the DL BWP configuration information included in the high-level configuration information may indicate the starting point of the BWP and the BWP size in PRBs exist Figure 15 In the DL BWP configuration information sent by the BS to the UE, it can indicate and And the UE can identify the end point of the BWP based on the configuration information The PRG grid may be determined based on the PRB bundling size (eg, PRB bundling granularity) configured according to the BWP configuration described above and high-level configuration information. Figure 15 In the example, it is assumed that the PRB bundling size is set to 2. In addition, the UE may receive UL subband configuration information from the BS, and the UL subband configuration information may indicate the starting point of the UL subband as associated with the UL subband frequency resource. And the size can be indicated as Therefore, the UE can identify the end point of the UL subband as The PRG size of the starting point of the DL BWP can be determined as And the PRG size of the end point can be determined as For other PRGs except the PRG at the start point and the PRG at the end point of the DL BWP, the UE can identify P′ BWP，i =2 to determine the PRG grid.

[0310] Figure 15 A case where the start point and the end point of the UL subband according to an embodiment are not aligned with the PRG grid is shown. Figure 15 The example of shows the case where the starting point of the UL subband frequency resource is not aligned with the PRG grid, and the ending point of the UL subband frequency resource is also not aligned with the PRG grid (case 3 described in method 2-1). Figure 15 In the example, the UE may determine the sizes of two PRGs close to the UL subband, namely, the sizes of PRG3 1501 and PRG5 1502. Specifically, for PRG3 1503 close to the starting point of the UL subband, the UE may determine the size of PRG3 1503 to be In addition, for PRG5 1504 that is close to the end point of the UL sub-band, the UE can determine that the size of PRG5 1504 is

[0311]

[0312] The BS can configure the UL sub-band for the UE flexibly and efficiently, and in particular can determine the PRG size considering the UL sub-band, even if the sizes of some PRGs are not explicitly and individually indicated to the UE. In addition, based on the configuration information received from the BS, the UE can determine the PRG size considering the UL sub-band, and can be able to determine the PRG size suitable for the SBFD system.

[0313] Method 2-2: Determining the PRG size when the PRG grid is aligned with the UL sub-band

[0314] The UE can determine the PRG size based on the DL BWP, PRB bundling size, and UL sub-band configuration information received from the BS via higher-layer signaling. According to the embodiments described above, when the UE determines that both the start point and the end point of the frequency resources of the UL sub-band are aligned with the PRG grid, the UE can determine the PRG size without separate calculation. That is, for one or more PRGs excluding the start point and the end point of the DL BWP, the UE can determine the size of each PRG as the PRB bundling size (P′ BWP，i ).

[0315] Method 2-3: The BS only configures the UL sub-band frequency resources aligned with the PRG grid

[0316] When the UE receives the UL sub-band configuration information from the BS, the UE can assume that the frequency resources of the UL sub-band identified based on the received configuration information are always aligned with the PRG grid. In other words, the UE may not expect the BS to configure the UL sub-band in a way that the start point or the end point of the UL sub-band frequency resources is not aligned with the PRG grid. Different from Method 2-1 or Method 2-2 described above, according to Method 2-3, the frequency resources of the UL sub-band determined according to the UL sub-band configuration information sent from the BS to the UE are always aligned with the PRG grid, and the UE can determine the PRG size based on the DL BWP and PRB bundling size received from the BS via higher-layer signaling. That is, for the PRGs excluding the start point and the end point of the DL BWP, the PRG size can be determined as the PRB bundling size (P′ BWP，i ).

[0317] The third embodiment: Explaining the size of the scheduled PRB

[0318] The third embodiment provides that the UE explains the size (NRB ) A method for receiving PDSCH in SBFD symbols / slots. The BS can send PDSCH-related configuration information to the UE via higher layer signaling. In an SBFD system, it is assumed that PDSCH transmission is performed only in SBFD symbols / slots, only in DL-only symbols / slots, or PDSCH transmission is performed simultaneously in both DL-only symbols / slots and SBFD symbols / slots. To allow PDSCH transmission only in predetermined symbols / slots (DL-only symbols / slots or SBFD symbols / slots), the time resources of the DL scheduling of the BS may be restricted, and thus the overall system performance may deteriorate. Therefore, to ensure the flexibility of PDSCH scheduling of the BS in an SBFD system, it is necessary to perform transmission in both DL-only symbols / slots and SBFD symbols / slots, which can be efficient from the perspective of system performance.

[0319] When PDSCH is transmitted in both DL-only symbols / slots and SBFD symbols / slots, the UE needs a method to accurately interpret the PRB size scheduled by the BS. For example, when the configuration information received by the UE from the BS includes information that needs to be calculated based on the size of the scheduled PRB (e.g., PTRS frequency density or PRB bundling size), the UE may need to clearly define whether to use the size of the PRB scheduled in DL-only symbols / slots to interpret this information or use the PRB size excluding the UL subband frequency resources from SBFD symbols / slots to interpret this information. For example, the BS can send information indicating that dynamicBundling is the PRB bundling type to the UE via higher layer signaling. In this case, the PRB bundling size can be determined based on the DCI indication information obtained from the BS and the situation of the configuration information (whether consecutive PRBs are scheduled and the size of the scheduled PRBs). Therefore, a reference for interpreting the size of the PRB suitable for scheduling in SBFD symbols / slots is needed. In addition, regarding the PTRS frequency density, the granularity in the frequency resource region can be determined based on the size of the scheduled PRB. For example, when the PRB size is scheduled to be higher than a predetermined value, the PTRS frequency density can be mapped at intervals of 4 RBs. In this case, the PTRS frequency density may be suitable for DL-only symbols / slots, but the corresponding PTRS frequency density may not be suitable for SBFD symbols / slots with a small frequency resource region.

[0320] Figure 16 Shows the PDSCH configuration scheduled in an SBFD system according to an embodiment.

[0321] Refer to Figure 16, the symbols / slots for DL reception in the SBFD system can be either only DL symbols / slots or DL sub-band symbols / slots (i.e., DL resources in the SBFD time slots / symbols). Associated with the frequency resources of the PDSCH scheduled by the BS for the UE, the start point and end point of the PRB can be clear in only DL symbols / slots. In the SBFD symbols / slots, when the scheduled PRB is located in both the DL sub-band and the UL sub-band, there may be ambiguity as to whether the UE needs to interpret the size of the scheduled PRB as the same as the size of only DL symbols / slots, or whether the UE needs to interpret the size of the scheduled PRB as the PRB size of the remaining frequency resources (i.e., the DL sub-band) after excluding the UL sub-band frequency resources from the PDSCH frequency resources. To overcome this drawback, the UE can interpret the size of the scheduled PRB by using at least one of the following scheduled PRB size interpretation methods.

[0322] Method 3-1: In the SBFD symbols / slots, the UE can interpret the size of the scheduled PRB as the size of the PRB excluding the UL sub-band from the PDSCH frequency resources, and can receive the PDSCH. In other words, the UE can interpret the PRB size of the scheduled PDSCH frequency resources as the number of PRBs in the DL sub-band in the SBFD symbols / slots, and can receive the PDSCH. Based on the scheduling information received by the UE from the BS, assume that the size of the scheduled PDSCH frequency resources is N RB，PDSCH , and the size of the frequency resources of the UL sub-band is N RB，UL subband . Based on the configuration information, the UE can interpret the size of the scheduled PRB in the SBFD symbols / slots as N RB = N RB，PDSCH - N RB，UL subband . Based on the interpreted size of the scheduled PRB, the UE can perform operations such as determining the PRB bundling size and / or interpreting the PTRS frequency density.

[0323] According to Method 3-1 mentioned above, the UE can determine the PRB bundling size considering only the DL sub-band, which is the resource suitable for PDSCH reception in the SBFD system, and can determine the PTRS frequency density.

[0324] Method 3-2: In the SBFD symbols / slots, the UE can interpret the size of the scheduled PRB as the size of the PRB configured as the PDSCH frequency resources, and can receive the PDSCH. In other words, the UE can interpret the PRB size of the scheduled PDSCH frequency resources as the number of PRBs without considering the UL sub-band and DL sub-band in the SBFD symbols / slots, and can receive the PDSCH. According to the scheduling information received by the UE from the BS, assume that the size of the scheduled PDSCH frequency resources is N RB，PDSCHAccording to Method 3-2, the UE can interpret the size of the PRBs scheduled in the SBFD symbol / slot as N RB = N RB，PDSCH That is, the UE can interpret the size of the PRBs configured as PDSCH frequency resources as the scheduled PRBs, regardless of the size of the UL subband. Based on the interpreted size of the scheduled PRBs, the UE can perform operations such as determining the PRB bundling size and / or interpreting the PTRS frequency density.

[0325] Figure 17 FIG. shows a method of interpreting the size of the PRBs scheduled in the SBFD symbol / slot according to an embodiment.

[0326] In Figure 17 according to the aforementioned Method 3-1, the UE can interpret the size of the PRBs scheduled in the SBFD symbol / slot as N RB，PDSCH -N RB，UL subband (or N RB，SBFD1 +N RB，SBFD2 ) and can receive the scheduled PDSCH. According to the aforementioned Method 3-2, the UE can interpret the size of the PRBs scheduled in the SBFD symbol / slot as N RB，PDSCH and can receive the scheduled PDSCH.

[0327] Fourth Embodiment: Method of Interpreting DL and UL BWP

[0328] The fourth embodiment provides a description associated with a method in which the UE interprets the size of the DL BWP to receive the PDSCH in the SBFD symbol / slot. As described in the third embodiment, for flexible scheduling in the SBFD system, it is necessary to allow data transmission in both only DL symbols / slots and SBFD symbols / slots. For example, when the BS configures dynamicBundling as the PRB bundling configuration in the PDSCH configuration, there is ambiguity in interpreting the size of the BWP in the SBFD system. Therefore, hereinafter, a method of interpreting the size of the configured BWP when the UE interprets the configuration information configured by the BS or performs an operation is provided.

[0329] Method 4-1: In the SBFD symbol / slot, the UE interprets the size of the BWP as excluding the frequency resources of the UL subband from the configured DL BWP, and can perform operations in the DL BWP. For example, based on the configuration information received from the BS, the UE can identify the size of the DL BWP as and can identify the size of the frequency resources of the UL subband as N RB，UL subband . Based on the configuration information, the UE can interpret the size of the DL BWP in the SBFD symbol / slot as And operations can be performed in the DL BWP. Based on the interpreted BWP size, the UE can perform operations such as determining the PRB bundling size in the DL BWP.

[0330] Method 4-2: In the SBFD symbol / slot, the UE can interpret the size of the BWP as the same as the size of the configured DL BWP, and can perform operations in the DL BWP. For example, based on the configuration information received from the BS, the UE can identify the size of the DL BWP as and can identify the frequency resource size of the UL sub-band as N RB，UL subband . Based on the configuration information, the UE can interpret the size of the DL BWP in the SBFD symbol / slot as and can perform operations in the DL BWP. Based on the interpreted BWP size, the UE can perform operations such as determining the PRB bundling size in the DL BWP.

[0331] Reference will be made to Figure 18 the examples to describe in detail the content related to Method 4-1 and Method 4-2. Figure 18 Fig. shows a method for interpreting the DL BWP in the SBFD symbol / slot according to an embodiment.

[0332] In Figure 18 , according to Method 4-1, the UE can interpret the size of the DL BWP in the SBFD symbol / slot as and can perform operations in the DL BWP. According to Method 4-2, the UE can interpret the size of the scheduled PRB in the SBFD symbol / slot as and can perform operations in the DL BWP.

[0333] Fifth Embodiment: Interpreting the precoding of broadband bundling when configuring PRB bundling

[0334] In the fifth embodiment, a method for interpreting precoding when configuring a broadband PRB bundling in the SBFD symbol / slot is provided. The BS can include PRB bundling configuration information in the PDSCH configuration information sent from the BS to the UE. When the PDSCH configuration information received by the UE from the BS includes configuration information indicating broadband as the PRB bundling configuration, the UE can assume the same precoding for the configured PDSCH frequency resources. When the PDSCH frequency resources in the SBFD symbol / slot are the frequency resource regions excluding the UL sub-band, a method for assuming precoding is provided to improve the channel estimation performance of the UE, as described below.

[0335] Method 5-1: Based on the scheduling information received from the BS, the UE may assume that different precodings can be applied to each of the frequency resources separated by UL subbands in the scheduled PDSCH frequency resource region. In the description of Figure 17 , the PDSCH frequency resource region in the SBFD symbol / slot may be separated into N RB，SBFD1 and N RB，SBFD2 by UL subbands. In this case, the UE may assume that precoding 1 is applied to region N RB，SBFD1 , and precoding 2 is applied to N RB，SBFD2 , and may receive the PDSCH (precoding 1 and precoding 2 mean that different types of precodings are applied). According to Method 5-1, different precodings are applied to each frequency domain, and thus the UE can expect the channel estimation performance associated with the DL data to be improved.

[0336] Method 5-2: Based on the scheduling information received from the BS, the UE may assume that the same precoding is applied throughout the frequency domain, regardless of the frequency resources separated into parts due to the UL subbands in the scheduled PDSCH frequency resource region (i.e., regardless of whether UL subbands exist). In the description of Figure 17 , although in the SBFD symbol / slot, due to the existence of UL subbands, the PDSCH frequency resource region is the region excluding the parts corresponding to the UL subbands, the UE may assume that the same precoding is applied to N RB，SBFD1 and N RB，SBFD2 , and may receive the PDSCH.

[0337] Figure 19 Illustrates the operation of the UE according to an embodiment.

[0338] In operation 1900, the UE may send information associated with UE capabilities (or capabilities or performance) to the BS. In operation 1905, the UE may receive configuration information generated with reference to UE capabilities from the BS via high-layer signaling. In operation 1910, the UE may receive scheduling information required for receiving the PDSCH from the BS via dynamic signaling (e.g., DCI). Based on the configuration information received via high-layer signaling and the scheduling information received via dynamic signaling, the UE may apply one or more methods proposed in the first to fifth embodiments. For example, according to at least one of the third and fourth embodiments, in operation 1915, the UE may interpret the size of the scheduled PRBs and the BWP size suitable for the corresponding symbols / slots by using DL BWP configuration information, UL subband configuration information, and PDSCH scheduling information. As another example, according to the first, second, and fifth embodiments, in operation 1915, the UE may determine whether the UL subband is aligned with the PRG grid and may determine and apply an appropriate PRG size (PRB bundling size) based on whether there is alignment. Subsequently, in operation 1920, the UE may receive the PDSCH from the BS according to the result of the pre-executed operations.

[0339] Figure 20 Shows operations of the BS according to an embodiment.

[0340] In operation 2000, the BS may receive information associated with UE capabilities (or capabilities or performance) from the UE. In operation 2005, the BS may generate configuration information related to the received UE capabilities and may send the configuration information to the UE via high-layer signaling. Subsequently, in operation 2010, the BS may send scheduling information required for PDSCH transmission to the UE via dynamic signaling (e.g., DCI), and in operation 2015, the BS may send the PDSCH to the UE according to the methods proposed in the first, second, and fifth embodiments described above.

[0341] Figure 21 Shows a UE in a wireless communication system according to an embodiment.

[0342] Referring to Figure 21 , the UE may include a transceiver, a memory, and a UE processor 2105 (or UE controller or processor) as a collective name for the UE receiver 2100 and the UE transceiver 2110. According to the communication method of the UE described above, the transceiver 2100 and 2110, the memory, and the UE processor 2105 may operate. However, the constituent elements of the UE are not limited to the examples described above. For example, the UE may include fewer or more constituent elements than those described above. In addition, the transceiver, the memory, and the processor may be implemented as a single chip.

[0343] The transceiver can use the BS to perform signal transmission or reception. The signal can include control information and data. To this end, the transceiver can include an RF transmitter that up-converts and amplifies the transmitted signal, an RF receiver that low-noise amplifies and down-converts the received signal, etc. This is only an example of the transceiver, and the constituent elements of the transceiver are not limited to the RF transmitter and the RF receiver.

[0344] In addition, the transceiver can receive a signal via a wireless channel, output the signal to the processor, and transmit the signal output from the processor via the wireless channel.

[0345] The memory can store programs and data required for UE operation. In addition, the memory can store control information or data included in the signals transmitted or received by the UE. The memory can be implemented as a storage medium, such as ROM, RAM, hard disk, CD-ROM, DVD, etc., or can be implemented as a combination of storage media. In addition, multiple memories can be used.

[0346] The processor can control a series of processes so that the UE operates according to the above-described embodiments of the present disclosure. For example, the processor can receive DCI configured in two types of layers and can control the constituent elements of the UE to receive multiple PDSCHs in parallel. Multiple processors can be used, and the processor can implement the programs stored in the memory to control the constituent elements of the UE.

[0347] Figure 22 Shows a BS in a wireless communication system according to an embodiment.

[0348] Refer to Figure 22 , the BS can include a transceiver, a memory, and a BS processor 2205 (or BS controller or processor) as a collective name for the BS receiver 2210 and the BS transmitter 2210. According to the above-described communication method of the BS, the transceiver 2200 and 2210, the memory, and the BS processor 2205 of the BS can operate. However, the constituent elements of the BS are not limited to the above-described examples. For example, the BS can include fewer or more constituent elements than those described above. In addition, the transceiver, the memory, and the processor can be implemented as a single chip.

[0349] The transceiver can perform signal transmission or reception with the UE. To this end, the transceiver can include an RF transmitter that up-converts and amplifies the transmitted signal, an RF receiver that low-noises amplifies and down-converts the received signal, etc. However, this is only one embodiment, and the constituent elements of the transceiver are not limited to the RF transmitter and the RF receiver.

[0350] In addition, the transceiver may receive a signal via a wireless channel, output the signal to the processor, and transmit the signal output from the processor via the wireless channel.

[0351] The memory may store programs and data required for BS operation. In addition, the memory may store control information or data included in the signals transmitted or received by the BS. The memory may be implemented as a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, etc., or may be implemented as a combination of storage media. In addition, multiple memories may be used.

[0352] The processor may control a series of processes such that the BS operates according to the above-described embodiments of the present disclosure. For example, the processor may receive DCI configured in two types of layers and control component elements of the UE to receive multiple PDSCHs in parallel. Multiple processors may be used, and the processor may implement the programs stored in the memory to control the constituent elements of the BS.

[0353] The method according to various embodiments described herein may be implemented by hardware, software, or a combination of hardware and software.

[0354] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within the electronic device. At least one program may include instructions for causing the electronic device to execute the method according to various embodiments disclosed herein.

[0355] The program (software module or software) may be stored in a non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, compact disc ROM (CD-ROM), digital versatile disc (DVD), or other types of optical storage devices, or magnetic tape. Alternatively, any combination of some or all of them may form the memory storing the program. Multiple such memories may be included in the electronic device.

[0356] In addition, the program may be stored in an attachable storage device, which may access the electronic device through a communication network such as the Internet, intranet, local area network (LAN), wide area network (WLAN), and storage area network (SAN), or a combination thereof. Such a storage device may access the electronic device via an external port. An independent storage device on the communication network may access the portable electronic device.

[0357] In the detailed embodiments described above of the present disclosure, the elements included in the present disclosure are represented in singular or plural according to the disclosed detailed embodiments. However, the singular or plural form is chosen to suit the situation presented, and the present disclosure is not limited by the elements represented in singular or plural. Thus, elements represented in plural may also include a single element, or elements represented in singular may also include a plurality of elements.

[0358] The embodiments of the present disclosure described and illustrated in the specification and drawings are only specific examples, which have been presented to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is to say, it will be obvious to those skilled in the art that other variations can be implemented based on the technical idea of the present disclosure. In addition, the above-described various embodiments can be used in combination as needed. For example, a part of one embodiment of the present disclosure can be combined with a part of another embodiment to operate the BS and the terminal. As an example, a part of Embodiment 1 of the present disclosure can be combined with a part of Embodiment 2 to operate the BS and the terminal. Moreover, although the above embodiments have been described based on the FDD LTE system, other variant embodiments based on the technical idea of the above embodiments can also be implemented in other systems such as the TDD LTE, 5G, or NR systems.

[0359] Herein, it should be understood that each block of the flowchart and combinations of multiple blocks in the flowchart can be executed by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, such that the instructions run by the processor of the computer or other programmable data processing device create a means for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can direct the computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the computer-usable or computer-readable memory produce a manufacture including an instruction means for implementing the functions specified in one or more flowchart blocks. The computer program instructions can also be loaded onto the computer or other programmable data processing device to initiate a series of operational steps to be executed on the computer or other programmable data processing device to produce a computer-implemented process, and these instructions can provide steps for implementing the functions specified in one or more flowchart blocks.

[0360] In addition, each block of the flowchart may represent a module, segment, or part of code that includes one or more executable instructions for implementing the specified logical function. It should also be noted that, in some alternative implementations, the functions recited in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

[0361] Although the present disclosure has been illustrated and described with reference to various embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising: receiving, from a base station BS, sub-band frequency information related to frequency domain resource allocation for an uplink UL sub-band; receiving downlink control information DCI related to frequency domain resource allocation for a physical downlink shared channel PDSCH from the BS; Based on the subband frequency information and the DCI, identifying a precoding resource block group PRG including at least one physical resource block PRB for the PDSCH; as well as The PDSCH is received from the BS based on the PRG.

2. The method according to claim 1, wherein: Identifying the PRG includes: determining whether a start position of the UL subband is aligned with a boundary of the PRG, or whether an end position of the UL subband is aligned with a boundary of the PRG; and Based on the determination, a size of the PRG is modified to align with the start position or the end position of the UL subband.

3. The method according to claim 1, further comprising: Based on the subband frequency information, identifying a number of PRBs scheduled for the PDSCH; as well as The number of the at least one PRB is identified based on the number of PRBs scheduled for the PDSCH.

4. The method according to claim 1, further comprising: receiving, from the BS, information configuring a size of a PRG for the PDSCH; as well as Based on the information, a first precoding is applied to a first part of the PDSCH, and a second precoding is applied to a second part of the PDSCH, wherein the first precoding and the second precoding are different.

5. A user equipment UE in a wireless communication system, the UE comprising: Transceiver; A controller is coupled to the transceiver and is configured to: receiving subband frequency information related to frequency domain resource allocation for uplink UL subband from a base station BS, receiving downlink control information DCI related to frequency domain resource allocation for a physical downlink shared channel PDSCH from the BS, identifying a precoding resource block group PRG including at least one physical resource block PRB for the PDSCH based on the subband frequency information and the DCI, and The PDSCH is received from the BS based on the PRG.

6. The UE according to claim 5, wherein: The controller is also configured to: determining whether the start position of the UL subband is aligned with the boundary of the PRG, or whether the end position of the UL subband is aligned with the boundary of the PRG, and Based on the determination, a size of the PRG is modified to align with the start position or the end position of the UL subband.

7. The UE according to claim 5, wherein: The controller is also configured to: identifying the number of PRBs scheduled for the PDSCH based on the subband frequency information, and The number of the at least one PRB is identified based on the number of PRBs scheduled for the PDSCH.

8. The UE according to claim 5, wherein: The controller is also configured to: receiving information configuring a size of a PRG for the PDSCH from the BS, and Based on the information, a first precoding is applied to a first part of the PDSCH, and a second precoding is applied to a second part of the PDSCH, The first precoding and the second precoding are different.

9. A method performed by a base station BS in a wireless communication system, the method comprising: Sending subband frequency information related to frequency domain resource allocation for an uplink UL subband to a user equipment UE; Sending downlink control information DCI related to frequency domain resource allocation for a physical downlink shared channel PDSCH to the UE; as well as Sending the PDSCH to the UE; The subband frequency information and the DCI are used to identify a precoding resource block group PRG including at least one physical resource block PRB for the PDSCH.

10. The method according to claim 9, wherein: Identifying the PRG includes: determining whether a start position of the UL subband is aligned with a boundary of the PRG, or whether an end position of the UL subband is aligned with a boundary of the PRG; and Based on the determination, a size of the PRG is modified to align with the start position or the end position of the UL subband.

11. The method according to claim 9, wherein: The subband frequency information is used to identify the number of PRBs scheduled for the PDSCH, and The number of PRBs scheduled for the PDSCH is used to identify the number of the at least one PRB.

12. The method according to claim 9, further comprising: Applying a first precoding to a first portion of the PDSCH and applying a second precoding to a second portion of the PDSCH, wherein the first precoding and the second precoding are different; and Sending information configuring the size of the PRG to the UE, The information indicates the type of the application.

13. A base station BS in a wireless communication system, the BS comprising: Transceiver; A controller is coupled to the transceiver and configured to: Sending subband frequency information related to frequency domain resource allocation for uplink UL subband to user equipment UE, sending downlink control information DCI related to frequency domain resource allocation for a physical downlink shared channel PDSCH to the UE, and sending the PDSCH to the UE, The subband frequency information and the DCI are used to identify a precoding resource block group PRG including at least one physical resource block PRB for the PDSCH.

14. The BS according to claim 13, wherein: Identifying the PRG includes: determining whether a start position of the UL subband is aligned with a boundary of the PRG, or whether an end position of the UL subband is aligned with a boundary of the PRG; and Based on the determination, a size of the PRG is modified to align with the start position or the end position of the UL subband.

15. The BS according to claim 13, wherein: The controller is also configured to: applying a first precoding to a first portion of the PDSCH and applying a second precoding to a second portion of the PDSCH, wherein the first precoding and the second precoding are different, and Sending information configuring the size of the PRG to the UE, The information indicates the type of the application.

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