Downlink data channel transmission method and apparatus for full duplex communication in wireless communication system

Abstract

The present disclosure relates to a 5th-Generation (5G) or 6th-Generation (6G) communication system for supporting higher data rates. Disclosed is a method performed by a user equipment (UE), the method comprising: receiving frequency domain resource assignment information from a base station; identifying, based on the frequency domain resource assignment information, at least one virtual resource block (VRB) associated with reception of a physical downlink shared channel (PDSCH); mapping the identified at least one VRB to at least one physical resource block (PRB); identifying whether the mapped at least one PRB overlaps with an uplink subband; and when the mapped at least one PRB is identified as overlapping with the uplink subband, receiving the PDSCH in at least one PRB after excluding the at least one PRB overlapping with the uplink subband from the mapped at least one PRB.

Description

Technical Field

[0001] The present disclosure relates to operations of a user equipment (UE) and a base station (BS) in a wireless communication system. More particularly, the present disclosure relates to a method for transmitting and receiving a data channel by a UE supporting full-duplex communication and an apparatus capable of performing the method. Background Art

[0002] Fifth-generation (5G) mobile communication technology defines a wide frequency band to enable high transmission rates and new services, and can be implemented not only in frequency bands below 6 gigahertz (GHz) (e.g., 3.5 GHz), but also in ultra-high frequency bands (above 6 GHz) known as millimeter waves (mmWave), such as 28 GHz and 39 GHz. Furthermore, sixth-generation (6G) mobile communication technology, known as a "beyond 5G" system, is being considered for implementation in terahertz (THz) frequency bands (e.g., bands from 95 GHz to 3 THz), aiming to achieve transmission rates 50 times higher than those of 5G mobile communication technology and ultra-low latency reduced to 1 / 10 of that of 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, the following are standardized to support services and meet the performance requirements for enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC) and massive machine-type communications (mMTC): beamforming and massive multiple input multiple output (MIMO) to mitigate radio path loss and increase radio propagation range in the ultra-high frequency band; support for various basic parameter sets (operation with multiple subcarrier spacing) and dynamic time slot format operation for efficient use of ultra-high frequency resources; initial access technology to support multi-beam transmission and broadband; definition and operation of bandwidth part (BWP); new channel coding and decoding schemes such as polar codes for highly reliable transmission of control information and low-density parity check (LDPC) codes for high-capacity data transmission; L2 preprocessing; network slicing for providing dedicated networks dedicated to specific services; etc.

[0004] Improvements and performance enhancements to early 5G mobile communication technologies are currently being discussed, taking into account the services that 5G mobile communication technologies are intended to support, and physical layer standardization is underway for technologies such as: vehicle-to-everything (V2X) to assist driving decisions of autonomous vehicles and increase user convenience based on vehicle location and status information transmitted by the vehicles; new radio unlicensed (NR-U) for system operation complying with various regulatory requirements in unlicensed bands; NR terminal low power consumption technology (UE power save); non-terrestrial network (NTN), i.e., direct terminal-satellite communication for ensuring coverage in areas where communication with terrestrial networks is unavailable; positioning; and so on.

[0005] In addition, standardization is underway for radio interface architectures / protocols for technologies such as the Industrial Internet of Things (IIoT), which supports new services through connectivity and convergence with other industries; integrated access and backhaul (IAB), which provides nodes that holistically support wireless backhaul and access links to expand the network service area; mobility enhancements including conditional handover and dual active protocol stack (DAPS) handover; a two-step random access channel (RACH) for New Radio (NR) to simplify the random access procedure; and more. Standardization is also underway for system architectures / service areas such as the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network functions virtualization (NFV) and software-defined networking (SDN); and mobile edge computing (MEC), which enables terminal location-based services.

[0006] When 5G mobile communication systems are commercialized, an explosive increase in the number of connected devices is expected to connect to the communication network, leading to the need to enhance the functionality and performance of 5G mobile communication systems and the integrated operation of connected devices. To this end, artificial intelligence (AI), machine learning (ML), and extended reality (XR) will be used to efficiently support augmented reality (AR), virtual reality (VR), and mixed reality (MR). New research will be conducted in areas such as 5G performance enhancement and complexity reduction, AI service support, metaverse service support, and drone communications.

[0007] Advances in 5G mobile communication systems can serve as the foundation for developing not only multi-antenna transmission technologies (such as massive antennas, array antennas, full-dimensional multi-input multi-output (FD-MIMO), and new waveforms for ensuring THz band coverage for 6G mobile communication technologies), high-dimensional spatial multiplexing technologies that use orbital angular momentum (OAM) and metamaterial-based lenses and antennas to enhance THz band signal coverage, and reconfigurable intelligent surface (RIS) technologies; but also full-duplex technologies for improving frequency efficiency and enhancing system networks for 6G mobile communication technologies; AI-based communication technologies that implement system optimization by using satellites and AI from the design stage and internalizing end-to-end AI support functions; and next-generation distributed computing technologies that implement advanced services beyond the computing capabilities of terminals by using ultra-high-performance communication and computing resources.

[0008] As various services become available with the advancement of wireless communication systems and the above-mentioned technologies, a method for seamlessly providing these services is required. Summary of the Invention

[0009] Solution to the problem

[0010] According to an embodiment of the present disclosure, a method performed by a user equipment (UE) may include receiving frequency-domain resource assignment information from a base station. According to an embodiment of the present disclosure, the method performed by the UE may include identifying at least one virtual resource block (VRB) associated with receiving a physical downlink shared channel (PDSCH) based on the frequency-domain resource assignment information. According to an embodiment of the present disclosure, the method performed by the UE may include mapping the identified at least one VRB to at least one physical resource block (PRB). According to an embodiment of the present disclosure, the method performed by the UE may include identifying whether the mapped at least one PRB overlaps with an uplink subband. According to an embodiment of the present disclosure, the method performed by the UE may include, when the mapped at least one PRB is identified as overlapping with an uplink subband, receiving the PDSCH in at least one PRB after excluding the at least one PRB overlapping with the uplink subband from the at least one mapped PRB.

[0011] A UE according to an embodiment of the present disclosure may include a transceiver and at least one processor connected to the transceiver. The at least one processor may be configured to receive frequency domain resource assignment information from a base station. The at least one processor may be configured to identify at least one VRB associated with reception of a PDSCH based on the frequency domain resource assignment information. The at least one processor may be configured to map the identified at least one VRB to at least one PRB. The at least one processor may be configured to identify whether the mapped at least one PRB overlaps with an uplink subband. The at least one processor may be configured to receive the PDSCH in at least one PRB after excluding the at least one PRB overlapping with the uplink subband from the mapped at least one PRB when the mapped at least one PRB is identified as overlapping with an uplink subband.

[0012] According to an embodiment of the present disclosure, a method performed by a base station may include mapping at least one VRB associated with the transmission of a PDSCH to at least one PRB. According to an embodiment of the present disclosure, the method performed by the base station may include identifying whether the at least one VRB overlaps with an uplink subband. According to an embodiment of the present disclosure, the method performed by the base station may include: when at least one VRB is identified as overlapping with an uplink subband, transmitting the PDSCH in at least one PRB after excluding at least one PRB corresponding to the at least one VRB overlapping with the uplink subband from the mapped at least one PRB. According to an embodiment of the present disclosure, the method performed by the base station may include: when at least one VRB is identified as not overlapping with an uplink subband, transmitting the PDSCH in the mapped at least one PRB.

[0013] A base station according to an embodiment of the present disclosure may include a transceiver and at least one processor connected to the transceiver. The at least one processor may be configured to map at least one VRB associated with transmission of a PDSCH to at least one PRB. The at least one processor may be configured to identify whether the at least one VRB overlaps with an uplink subband. The at least one processor may be configured to, when the at least one VRB is identified as overlapping with an uplink subband, transmit the PDSCH in at least one PRB after excluding at least one PRB corresponding to the at least one VRB overlapping with the uplink subband from the mapped at least one PRB. The at least one processor may be configured to, when the at least one VRB is identified as not overlapping with an uplink subband, transmit the PDSCH in the mapped at least one PRB. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The basic structure of the time-frequency domain in a wireless communication system according to an embodiment of the present disclosure is shown.

[0015] Figure 2 The structure of frames, subframes, and time slots in a wireless communication system according to an embodiment of the present disclosure is shown.

[0016] Figure 3 A configuration example of a bandwidth part (BWP) in a wireless communication system according to an embodiment of the present disclosure is shown.

[0017] Figure 4 An example of configuration of a control resource set of a downlink (DL) control channel in a wireless communication system according to an embodiment of the present disclosure is shown.

[0018] Figure 5 The structure of a DL control channel in a wireless communication system according to an embodiment of the present disclosure is shown.

[0019] Figure 6is a diagram for describing a method in which a base station (BS) and a user equipment (UE) in a wireless communication system transmit and receive data by considering a DL data channel and rate matching resources according to an embodiment of the present disclosure.

[0020] Figure 7 An example of frequency domain resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure is shown.

[0021] Figure 8 An example of time domain resource allocation of a PDSCH in a wireless communication system according to an embodiment of the present disclosure is shown.

[0022] Figure 9 An example of time domain resource allocation based on subcarrier spacing (SCS) of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure is shown.

[0023] Figure 10 is a diagram illustrating a method of configuring a subband non-overlapping full duplex (SBFD) configuration in a wireless communication system according to an embodiment of the present disclosure.

[0024] Figure 11 is a diagram illustrating an example of a virtual resource block (VRB) allocation and a VRB to physical resource block (PRB) mapping method according to an embodiment of the present disclosure.

[0025] Figure 12 is a diagram illustrating an example of a VRB allocation and VRB-PRB mapping method in an SBFD system according to an embodiment of the present disclosure.

[0026] Figure 13 is a diagram illustrating an example of a VRB allocation and VRB-PRB mapping method in an SBFD system according to an embodiment of the present disclosure.

[0027] Figure 14 The structure of a user equipment (UE) in a wireless communication system according to an embodiment of the present disclosure is shown.

[0028] Figure 15 The structure of a base station in a wireless communication system according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0030] In the following description of the embodiments, descriptions of technical features that are well known in the art to which the present disclosure belongs and are not directly related to the present disclosure are omitted. This is to clearly describe the essence of the present disclosure without obscuring it by omitting unnecessary descriptions.

[0031] For the same reason, in the accompanying drawings, some components are exaggerated, omitted or schematically shown. Further, the size of each element does not fully reflect its actual size. In the accompanying drawings, the same reference numerals always refer to the same or corresponding elements.

[0032] The advantages and features of the present disclosure and their implementation methods will be more clearly understood by reference to the following description of the embodiments and drawings. However, the present disclosure can be embodied in many different forms and should not be interpreted as being limited to the disclosed embodiments set forth below; more precisely, the present embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those of ordinary skill in the art, and the present disclosure will be defined only by the appended claims. Throughout the specification, the same figure numerals refer to the same elements. Further, in the description of the present disclosure, when it is determined that a detailed description of the relevant function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description will be omitted. In addition, as will be described later, these terms are defined by taking into account the functions described in the present disclosure and may vary according to practice or the intention of the user or operator. Therefore, the definition of these terms should be based on the overall description in the specification.

[0033] In the following description, a base station is an entity that allocates resources to a terminal (or user equipment (UE)) and can be at least one of a next-generation Node B (gNode B), an evolved Node B (eNode B), a Node B, a base station (BS), a radio access unit, a BS controller, or a node on a network. A terminal can include a UE, a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, downlink (DL) refers to the radio transmission path for signals transmitted from a BS to a UE, and uplink (UL) refers to the radio transmission path for signals transmitted from a UE to a BS. Furthermore, although embodiments of the present disclosure are described below for Long-Term Evolution (LTE) or LTE-Advanced (LTE-A) systems, embodiments of the present disclosure can also be applied to other communication systems with similar technical backgrounds and channel configurations. For example, the fifth generation (5G) (New Radio (NR)) mobile communication technology developed after LTE-A can be included in other communication systems. Hereinafter, 5G is a concept that includes existing LTE, LTE-A, and other similar services. Further, the present disclosure may be applied to other communication systems through some modifications within the scope that does not significantly depart from the scope of the present disclosure when judged by those skilled in the art.

[0034] It will be understood that each flowchart block, and combinations of flowchart blocks, in the accompanying drawings can be implemented by computer program instructions. These computer program instructions can be loaded onto a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, whereby the instructions, when executed by the processor of the computer or other programmable data processing device, generate means for performing the functions specified in the flowchart block(s). The computer program instructions can also be stored in a computer-executable or computer-readable memory capable of directing a computer or other programmable data processing device to perform functions in a specific manner, whereby the instructions stored in the computer-executable or computer-readable memory can produce an article of manufacture that includes instruction means for performing the functions described in the flowchart block(s). The computer program instructions can also be loaded onto a computer or other programmable data processing device, whereby the instructions, when executed by the computer or other programmable data processing device, generate a computer-implemented process that operates the computer or other programmable data processing device, and provide operations for performing the functions described in the flowchart block(s).

[0035] Furthermore, each block may represent a module, segment, or portion of code that includes one or more executable instructions for performing (a plurality of) specified logical functions. It should also be noted that in some alternative embodiments, the functions mentioned in the blocks may not appear in order. For example, two blocks shown in succession may be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding functions.

[0036] As used herein, the term "unit" refers to a software element or hardware element, such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), that performs certain functions. However, the term "unit" is not limited to software or hardware. A "unit" can be configured to reside in an addressable storage medium or to operate one or more processors. Thus, the term "unit" may include, for example, elements (such as 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 variables. The functions provided by elements and "units" can be combined into a smaller number of elements and "units" or further divided into additional elements and "units." Furthermore, elements and "units" can be implemented as one or more central processing units (CPUs) in an operating device or secure multimedia card. Furthermore, in one embodiment, a "unit" may include one or more processors.

[0037] Wireless communication systems have evolved from providing initial voice-centric services to broadband wireless communication systems that provide high-speed, high-quality packet data services based on communication standards such as High Speed ​​Packet Access (HSPA) of the 3rd Generation Partnership Project (3GPP), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-A, LTE-Pro, High Rate Packet Data (HRPD) of 3GPP2, Ultra Mobile Broadband (UMB), and Institute of Electrical and Electronic Engineers (IEEE) 802.16e.

[0038] As a representative example of such a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme for the downlink (DL) and a single carrier frequency division multiple access (SC-FDMA) scheme for the uplink (UL). The UL refers to the radio link through which the UE or MS sends data or control signals to the base station (or eNB), while the DL refers to the radio link through which the base station sends data or control signals to the UE. In this multiple access scheme, the data or control information of each user can be distinguished by allocating and operating time-frequency resources that carry the data or control information to each user so that they do not overlap with each other, that is, to establish orthogonality between the time-frequency resources.

[0039] Because post-LTE communication systems (i.e., 5G communication systems) need to be able to freely reflect the diverse requirements of users and service providers, 5G communication systems need to support services that simultaneously meet these requirements. Services under consideration for 5G communication systems include enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable low-latency communication (URLLC).

[0040] eMBB aims to provide significantly higher data transfer rates than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, from the perspective of the base station (BS), eMBB should be able to deliver a peak data rate of 20 Gbps in the downlink (DL) and 10 Gbps in the uplink (UL). Furthermore, 5G communication systems should be able to deliver peak data rates while providing improved user-perceived data rates. To meet these requirements, 5G communication systems require improvements in various transmission and reception technologies, including further enhanced multiple-input, multiple-output (MIMO) transmission technology. Furthermore, while current LTE systems transmit signals using transmission bandwidths up to 20 megahertz (MHz) in the 2 GHz band, 5G communication systems can also meet the data transfer rates required by 5G technology by using frequency bandwidths wider than 20 MHz in the 3 GHz to 6 GHz band or above.

[0041] Meanwhile, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide IoT, mMTC may need to support connections with a large number of terminals (or UEs) in a cell, enhanced terminal coverage, improved battery life, low terminal costs, etc. Because IoT is a system equipped with multiple sensors and various devices to provide communication functions, it must be able to support a large number of terminals in a cell (for example, per square kilometer (km2)). 2 ) 1 million terminals). Furthermore, because terminals supporting mMTC are likely to be located in shadowed areas (such as building basements) that are not covered by cell coverage due to the nature of the service, mMTC may require wide area coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC should be configured as low-cost terminals and may require very long battery life (such as 10 to 15 years) because frequent battery replacement is difficult.

[0042] Finally, URLLC is a cellular-based wireless communication service for mission-critical applications. For example, possible applications of URLLC may include services for remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote healthcare, emergency alert services, etc. Therefore, the communication provided by URLLC requires very low latency and very high reliability. For example, services supporting URLLC need to meet sub-millisecond (less than 0.5 millisecond) air interface latency and require 10 -5Therefore, for services supporting URLLC, the 5G system needs to provide a shorter transmission time interval (TTI) than other services, and may also require a design for allocating broadband resources to ensure high reliability of the communication link.

[0043] The three services supported by 5G (i.e., eMBB, URLLC, and mMTC) can be multiplexed for transmission in a single system. Different transmission and reception schemes and parameters can be used between the services to meet the different requirements for the respective services. However, 5G is not limited to these three services.

[0044] According to an embodiment of the present disclosure, a method for scheduling a physical downlink shared channel (PDSCH) in a wireless communication system is provided. The method may include scheduling the PDSCH with reference to information about UL subbands when a base station configures PDSCH frequency resource information for a UE. The method may also include a resource block (RB) bundling method that considers UL subbands when the base station configures PDSCH frequency resource information for the UE. The method may also include a method that maps virtual resource blocks (VRBs) to physical resource blocks (PRBs) when the base station configures PDSCH frequency resource information for the UE. The method may include a method that does not consider information about UL subbands and a method that considers information about UL subbands.

[0045] [NR time-frequency resources]

[0046] The frame structure in the 5G system is described in more detail with reference to the accompanying drawings.

[0047] Figure 1 The basic structure of the time-frequency domain is shown, where the time-frequency domain is a radio resource domain in which data or control channels are transmitted in the 5G system.

[0048] exist Figure 1 In the figure, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The basic resource unit in the time domain and the frequency domain is the resource element (RE) 101. The RE 101 can be defined as an orthogonal frequency division multiplexing (OFDM) symbol 102 on the time axis and a subcarrier 103 on the frequency axis. In the frequency domain, (eg, 12) consecutive REs may constitute a single RB 104.

[0049] Figure 2 The structure of frames, subframes, and time slots in a wireless communication system according to an embodiment of the present disclosure is shown.

[0050] exist Figure 2, an example of the structure of a frame 200, a subframe 201, and a time slot 202 is shown. One frame 200 may be defined as being 10 ms long. One subframe 201 may be defined as being 1 ms long, and thus, a total of 10 subframes 201 may constitute one frame 200. One time slot 202 or 203 may be defined as having 14 OFDM symbols (i.e., the number of symbols per 1 time slot ( )=14). One subframe 201 may include one or more time slots 202 or 203, and the number of time slots 202 and 203 per 1 subframe may vary depending on the subcarrier spacing (SCS) configuration value μ (204 and 205). Figure 2 In the example of , μ = 0 (204) and μ = 1 (205) are shown as SCS configuration values. In the case of μ = 0 (204), one subframe 201 may include one time slot 202, while in the case of μ = 1 (205), one subframe 201 may include two time slots 203. That is, depending on the SCS configuration value μ, the number of time slots per 1 subframe ( The number of time slots per frame can vary. Can be changed accordingly. Depends on the SCS configuration value μ and It can be defined in Table 1 below.

[0051] [Table 1]

[0052]

[0053] [Bandwidth Part (BWP)]

[0054] Next, a configuration for a bandwidth part (BWP) in a 5G communication system is described in detail with reference to relevant drawings.

[0055] Figure 3 An example of the configuration of a bandwidth part (BWP) in a wireless communication system according to an embodiment of the present disclosure is shown.

[0056] exist Figure 3 In the example shown in FIG, the UE bandwidth 300 is configured as two BWPs, BWP#1 301 and BWP#2 302. The BS may configure one or more BWPs for the UE and configure the information in Table 2 below for each BWP.

[0057] [Table 2]

[0058]

[0059] However, BWP configuration is not limited to this example. In addition to the configuration information described above, various BWP-related parameters may be configured for the UE. This information may be sent by the BS to the UE via higher-layer signaling (e.g., radio resource control (RRC) signaling). At least one of the configured BWP(s) may be activated. The BS may notify the UE of the activation of a configured BWP semi-statically via RRC signaling or dynamically via DL control information (DCI).

[0060] According to some embodiments, before a UE establishes an RRC connection, a base station (BS) may configure an initial base station (BWP) for the UE for initial access in a Master Information Block (MIB). Specifically, the UE may receive configuration information for a control resource set (CORESET) and search space, where a physical downlink control channel (PDCCH) may be transmitted in the CORESET and search space to receive system information required for initial access (corresponding to remaining system information (RMSI) or system information block 1 (SIB1)) via the MIB during the initial access procedure. The CORESET and search space configured in the MIB may each be considered to have an identifier (ID) of 0. The BS may notify the UE of configuration information for CRE#0, such as frequency allocation information, time allocation information, and a basic parameter set, in the MIB. The BS may also notify the UE of configuration information for monitoring period and timing of CRE#0, i.e., configuration information for search space#0, in the MIB. The UE may regard the frequency region set to the control resource set #0 obtained from the MIB as the initial BWP for initial access. In this case, the ID of the initial BWP may be regarded as 0.

[0061] This configuration of the 5G-powered BWP can be used for various purposes.

[0062] According to some embodiments, the situation when the bandwidth supported by the UE is less than the system bandwidth can be addressed by configuring the BWP. For example, the BS can configure the frequency location of the BWP for the UE (configuration information 2), thereby allowing the UE to transmit or receive data at a specific frequency location within the system bandwidth.

[0063] Furthermore, according to some embodiments, to support different basic parameter sets, a BS may configure multiple BWPs for a UE. For example, to support a UE using both a 15 kHz SCS and a 30 kHz SCS for data transmission and reception, two BWPs may be configured using the 15 kHz and 30 kHz SCSs, respectively. Different BWPs may be frequency-division multiplexed, and for data transmission and reception using a specific SCS, the BWP configured using the corresponding SCS may be activated.

[0064] Furthermore, according to some embodiments, to reduce UE power consumption, the BS can configure a UE with a BWP of different bandwidth sizes. For example, if a UE supports a very large bandwidth (e.g., 100 MHz) and always transmits or receives data within this bandwidth, the UE may consume a significant amount of power. Specifically, in the absence of traffic, monitoring unnecessary downlink control channels within the large 100 MHz bandwidth can be very inefficient in terms of power consumption. To reduce UE power consumption, the BS can configure a UE with a relatively smaller BWP, such as a 20 MHz BWP. In the absence of traffic, the UE can monitor the 20 MHz BWP. When data is available, the UE can transmit or receive data using the 100 MHz BWP based on instructions from the BS.

[0065] In the method for configuring the BWP, before making an RRC connection, the UE may receive configuration information for the initial BWP in the MIB during the initial access process. Specifically, the UE may be configured with a control resource set (or CORESET) for a DL control channel via the MIB in the physical broadcast channel (PBCH), where DCI may be sent on the DL control channel to schedule the SIB. The bandwidth of the control resource set configured in the MIB may be regarded as the initial BWP, and the UE may receive the PDSCH on which the SIB is sent in the configured initial BWP. In addition to receiving SIBs, the initial BWP may also be used for other system information (OSI), paging, or random access.

[0066] [BWP Switch]

[0067] When one or more BWPs are configured for a UE, the BS can indicate the switching or transition of BWPs to the UE by using the BWP indicator field in the DCI. For example, when the UE's current active BWP is Figure 3When BWP#1 301 in the received DCI is selected, the BS may indicate BWP#2 302 to the UE via the BWP indicator in the DCI, and the UE may perform BWP switching to switch to BWP#2 302 indicated via the BWP indicator in the received DCI.

[0068] Because the DCI-based BWP switching can be indicated by the DCI that schedules the PDSCH or physical UL shared channel (PUSCH), when receiving the BWP switching request, the UE can send or receive the PDSCH or PUSCH scheduled by the DCI in the switched BWP without difficulty. For this purpose, the standard specifies the BWP switching delay T required for BWP switching. BWP The requirements may be defined, for example, in Table 3 below:

[0069] [Table 3]

[0070]

[0071] Depending on the capability of the UE, the requirement for BWP switching delay supports Type 1 or Type 2. The UE may report the supportable BWP delay types to the BS.

[0072] According to the requirement for BWP switching delay, when receiving DCI including BWP switching indicator in time slot n, UE can switch to BWP at no later than time slot n+T BWP The BS completes the switching to the new BWP indicated by the BWP switching indicator in the time and performs transmission and reception of the data channel scheduled by the corresponding DCI in the new BWP. In order to schedule the data channel on the new BWP, the BS may consider the BWP switching delay T of the UE. BWP To determine the time domain resource allocation for the data channel. In other words, when the data channel is scheduled using the new BWP, in the method of determining the time domain resource allocation for the data channel, the BS may schedule the data channel after the BWP switching delay. Accordingly, the UE may not expect the DCI indicating the BWP switching to be less than the BWP switching delay T BWP The timeslot offset value (K0 or K2).

[0073] When a UE receives a DCI indicating a BWP switch (e.g., DCI format 1_1 or 0_1), the UE may not perform any transmission or reception during the time interval from the third symbol of the time slot in which the PDCCH including the DCI is received to the start of the time slot indicated by the time slot offset value (K0 or K2) indicated in the time domain resource allocation indicator field in the DCI. For example, when the UE has received a DCI indicating a BWP switch in time slot n and the time slot offset value indicated by the DCI is K, the UE may not perform any transmission or reception from the third symbol of time slot n to the symbol before time slot n+K (i.e., the last symbol of time slot n+K-1).

[0074] [SS / PBCH block]

[0075] A synchronization signal (SS) / PBCH block in 5G will now be described.

[0076] The SS / PBCH block may refer to a physical layer channel block including the primary SS (PSS), secondary SS (SSS), and PBCH, which is defined as follows:

[0077] PSS: A reference signal used for DL ​​time / frequency synchronization, which provides partial information of the cell ID.

[0078] SSS: A reference signal used for DL ​​time / frequency synchronization that provides the remainder of the cell ID information not provided by the PSS. It can also be used as another reference signal for demodulation of the PBCH.

[0079] PBCH: A channel used to provide UEs with basic system information required to transmit or receive data channels and control channels. Basic system information can include search space-related control information indicating radio resource mapping information for control channels and scheduling control information for additional data channels used to transmit system information.

[0080] SS / PBCH block: SS / PBCH block is a combination of PSS, SSS and PBCH. One or more SS / PBCH blocks can be sent within 5 ms, and each SS / PBCH block can be distinguished by an index.

[0081] During initial access, the UE can detect the PSS and SSS and decode the PBCH. The UE can obtain the MIB from the PBCH and, through the MIB, be configured with control resource set (CORESET) #0 (corresponding to CORESET index 0). The UE can assume that the demodulation reference signal (DMRS) transmitted in the selected SS / PBCH block and CORESET #0 are quasi-colocated (QCL) and can monitor CORESET #0. The UE can receive system information in the DL control information transmitted in CORESET #0. From the received system information, the UE can obtain random access channel (RACH)-related configuration information required for initial access. The UE can transmit a physical RACH (PRACH) to the base station, taking into account the selected SS / PBCH index. Upon receiving the PRACH, the base station can obtain information about the SS / PBCH block index selected by the UE. The base station can then determine that the UE has selected any of the corresponding SS / PBCH blocks and is monitoring CORESET #0 associated with the selected SS / PBCH.

[0082] [PDCCH: DCI]

[0083] DCI in the 5G system will now be described in detail.

[0084] In 5G systems, scheduling information for UL data (or PUSCH) or DL ​​data (or PDSCH) is transmitted from the base station to the user equipment (UE) in a DCI format. The user equipment (UE) can monitor the fallback DCI format and non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may include fixed fields predefined between the base station and the user equipment (UE), while the non-fallback DCI format may include configurable fields.

[0085] DCI can be sent on the PDCCH after undergoing the channel coding and modulation process. A cyclic redundancy check (CRC) can be attached to the DCI message payload, and the CRC can be scrambled by the radio network temporary identifier (RNTI) corresponding to the UE's ID. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, random access response (RAR), etc. In other words, the RNTI is not sent explicitly, but is sent during the CRC calculation process. After receiving the DCI message sent on the PDCCH, the UE can use the assigned RNTI to check the CRC, and when the CRC check result is correct, it is determined that the DCI message is sent to the UE.

[0086] For example, the DCI for PDSCH scheduled for system information (or SI) can be scrambled by the SI-RNTI. The DCI for PDSCH scheduled for RAR messages can be scrambled by the RA-RNTI. The DCI for PDSCH scheduled for paging messages can be scrambled by the P-RNTI. The DCI for notifying the slot format indicator (SFI) can be scrambled by the SFI-RNTI. The DCI for notifying transmit power control (TPC) can be scrambled by the TPC-RNTI. The DCI used to schedule UE-specific PDSCH or PUSCH can be scrambled by the cell RNTI (C-RNTI).

[0087] DCI format 0_0 may be used for fallback DCI scheduling PUSCH, in which case the CRC may be scrambled by the C-RNTI. DCI format 0_0 with a CRC scrambled by the C-RNTI may include, for example, the information in Table 4 below.

[0088] [Table 4]

[0089]

[0090] DCI format 0_1 ​​may be used for non-fallback DCI scheduling PUSCH, in which case the CRC may be scrambled by the C-RNTI. DCI format 0_1 ​​with a CRC scrambled by the C-RNTI may include, for example, the information in Table 5 below.

[0091] [Table 5]

[0092]

[0093]

[0094] DCI format 1_0 may be used for fallback DCI scheduling PDSCH, in which case the CRC may be scrambled by the C-RNTI. DCI format 1_0 with CRC scrambled by the C-RNTI may include, for example, the information in Table 6 below.

[0095] [Table 6]

[0096]

[0097] DCI format 1_1 may be used for non-fallback DCI scheduling PDSCH, in which case the CRC may be scrambled by the C-RNTI. DCI format 1_1 with CRC scrambled by the C-RNTI may include, for example, the information in Table 7 below.

[0098] [Table 7]

[0099]

[0100]

[0101] [PDCCH: CORESET, REG, CCE, search space]

[0102] The DL control channel in the 5G communication system will now be described in detail with reference to the relevant drawings.

[0103] Figure 4 An example of a control resource set (or CORESET) in which a DL control channel is transmitted in a 5G wireless communication system is shown. Figure 4 An example is shown in which two control resource sets (control resource set #1 401 and control resource set #2 402) are configured in a UE BWP 410 on the frequency axis and in a time slot 420 on the time axis. Control resource sets 401 and 402 may be configured in specific frequency resources 403 within the entire UE BWP 410 on the frequency axis. Control resource sets 401 and 402 may be configured with one or more OFDM symbols, where these OFDM symbols may be defined as a control resource set duration 404. Figure 4 For example, control resource set #1 401 may be configured with a control resource set duration of 2 symbols, and control resource set #2 402 may be configured with a control resource set duration of 1 symbol.

[0104] As described above, in 5G, the BS can configure a control resource set for the UE through higher-layer signaling (e.g., SI, MIB, or RRC signaling). Configuring a control resource set for the UE means providing the UE with information such as the control resource set ID, control resource set frequency location, and control resource set symbol length. For example, the information in Table 8 may be included.

[0105] [Table 8]

[0106]

[0107]

[0108] In Table 8, tci-StatesPDCCH (hereinafter referred to as transmission configuration indication (TCI) state) configuration information may include information about one or more SS / PBCH block indices having a quasi co-location (QCL) relationship with a DMRS or channel state information reference signal (CSI-RS) index transmitted in a corresponding control resource set.

[0109] Figure 5 An example of a basic unit of time-frequency resources forming a DL control channel to be used in 5G is shown. Figure 5 The basic unit of time-frequency resources forming the control channel is called a resource element group (REG) 503. REG 503 can be defined by one OFDM symbol 501 on the time axis and one PRB 502 on the frequency axis (i.e., 12 subcarriers). The BS can configure the DL control channel allocation unit by connecting REG 503.

[0110] exist Figure 5 In 5G, when the DL control channel allocation unit is called a control channel element (CCE) 504, one CCE 504 may include multiple REGs 503. For example, Figure 5 As shown, REG 503 may include 12 REs, and when one CCE 504 includes 6 REGs 503, one CCE 504 may include 72 REs. When a DL control resource set is configured, it may include multiple CCEs 504, and a specific DL control channel may be transmitted by mapping to one or more CCEs 504 based on the aggregation level (or AL) in the control resource set. CCEs 504 in the control resource set may be distinguished by numbering, where numbers may be assigned to CCEs 504 in a logical mapping method.

[0111] Figure 5The basic unit of the DL control channel shown (ie, REG 503) may include all REs to which DCI is mapped and an area to which DMRS 505 is mapped, wherein DMRS 505 is a reference signal for decoding REs. Figure 5 As shown, 3 DMRS 505 can be sent in one REG 503. Depending on the AL, the number of CCEs required to send the PDCCH can be 1, 2, 4, 8 or 16, and different numbers of CCEs can be used to implement link adaptation of the DL control channel. For example, when AL = L, a single DL control channel can be sent in L CCEs. The UE needs to detect the signal without knowing the information about the DL control channel, and a search space representing a set of CCEs is defined for blind decoding. The search space is a set of DL control channel candidates including the CCEs that the UE needs to attempt to decode under a given AL, and the UE can have multiple search spaces because there are various ALs, each AL constituting a bundle with 1, 2, 4, 8 or 16 CCEs. A search space set can be defined as the set of search spaces under all configured ALs.

[0112] Search spaces can be classified into common search spaces and UE-specific search spaces. A certain group of UEs or all UEs can monitor the common search space of the PDCCH to dynamically schedule system information or receive cell common control information, such as paging messages. For example, PDSCH scheduling allocation information for sending SIBs including cell operator information, etc. can be received by monitoring the common search space of the PDCCH. For the common search space, a certain group of UEs or all UEs need to receive the PDCCH, so the common search space can be defined as a set of pre-agreed CCEs. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by monitoring the UE-specific PDCCH search space. The UE-specific search space can be defined in a UE-specific manner as a function of the UE's identity and various system parameters.

[0113] In 5G, the base station (BS) can configure the parameters for the PDCCH search space for the UE via higher-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the BS can configure the number of PDCCH candidates per ALL, the monitoring period of the search space, the monitoring timing in symbols within the time slot of the search space, the search space type (common search space or UE-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the index of the control resource set in which the search space is to be monitored. For example, the parameters may include the information in Table 9.

[0114] [Table 9]

[0115]

[0116]

[0117]

[0118] Depending on the configuration information, the BS may configure one or more search space sets for the UE. According to some embodiments, the BS may configure search space set 1 and search space set 2 for the UE, and configure the UE to monitor DCI format A scrambled by X-RNTI in search space set 1 in the common search space, and to monitor DCI format B scrambled by Y-RNTI in search space set 2 in the UE-specific search space.

[0119] Depending on the configuration information, one or more search space sets may exist in the common search space or the UE-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, and search space set #3 and search space set #4 may be configured as UE-specific search spaces.

[0120] The following combinations of DCI formats and RNTIs may be monitored in the common search space. However, these combinations are not limited to the examples set forth below.

[0121] - DCI format 0_0 / 1_0, whose CRC is scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0122] - DCI format 2_0, whose CRC is scrambled by SFI-RNTI

[0123] - DCI format 2_1, whose CRC is scrambled by INT-RNTI

[0124] - DCI format 2_2, whose CRC is scrambled by TPC-PUSCH-RNTI and TPC-PUCCH-RNTI

[0125] - DCI format 2_3, whose CRC is scrambled by TPC-SRS-RNTI

[0126] The following combinations of DCI formats and RNTIs may be monitored in the user-specific search space. However, these combinations are not limited to the examples set forth below.

[0127] - DCI format 0_0 / 1_0, whose CRC is scrambled by C-RNTI, CS-RNTI, and TC-RNTI

[0128] - DCI format 1_0 / 1_1, whose CRC is scrambled by C-RNTI, CS-RNTI, and TC-RNTI

[0129] The above RNTI may meet the following definitions and uses.

[0130] Cell RNTI (C-RNTI): used to schedule UE-specific PDSCH

[0131] Temporary cell RNTI (TC-RNTI): used to schedule UE-specific PDSCH.

[0132] Configuration Scheduling RNTI (CS-RNTI): used to schedule a semi-statically configured UE-specific PDSCH

[0133] Random Access RNTI (RA-RANTI): used to schedule PDSCH during the random access procedure

[0134] Paging RNTI (P-RNTI): used to schedule the PDSCH on which paging is sent

[0135] System Information RNTI (SI-RNTI): used to schedule the PDSCH on which SI is sent

[0136] Interrupt RNTI (INT-RNTI): used to notify whether to puncture PDSCH

[0137] PUSCH Transmit Power Control RNTI (TPC-PUSCH-RNTI): used to indicate the power control command for PUSCH

[0138] PUCCH Transmit Power Control RNTI (TPC-PUCCH-RNTI): used to indicate the power control command for the Physical UL Control Channel (PUCCH)

[0139] Sounding Reference Signal Transmit Power Control RNTI (TPC-SRS-RNTI): used to indicate the power control command for SRS

[0140] The DCI format specified above may conform to the definition set forth in the example of Table 10 below.

[0141] [Table 10]

[0142]

[0143] In 5G, the search space at aggregation level L in the control resource set p and search space set s can be expressed as the following equation (1):

[0144] [Equation 1]

[0145]

[0146] - L: Aggregation Level (AL)

[0147] - : Carrier index

[0148] - : Total number of CCEs in control resource set p

[0149] - : time slot index

[0150] - : Number of PDCCH candidates at aggregation level L

[0151] - = 0, …, -1: PDCCH candidate index at aggregation level L

[0152] - = 0, …, -1

[0153] - ; ;for , ;for , ;for , ;

[0154] - :UE identifier

[0155] For the public search space, The value of can correspond to 0.

[0156] For UE-specific search space, The value of may correspond to a value that changes according to an identity of the UE (C-RNTI or ID configured by the BS for the UE) and a time index.

[0157] Since multiple search space sets with different parameters (e.g., the parameters in Table 9) can be configured in 5G, the UE can monitor different search space sets at each time point. For example, when search space set #1 is configured to have a period of X time slots and search space set #2 is configured to have a period of Y time slots, where X and Y are different, the UE can monitor both search space set #1 and search space set #2 in a specific time slot and monitor one of search space set #1 and search space set #2 in another specific time slot.

[0158] [PDCCH: BD / CCE restriction]

[0159] When multiple search space sets are configured for a UE, the following conditions may be considered in a method for determining a search space set to be monitored by the UE.

[0160] When the value of higher layer signaling monitoringCapabilityConfig-r16 is configured as r15monitoringcapability for the UE, the UE defines the maximum value of the number of PDCCH candidates to be monitored and the maximum value of the number of CCEs constituting the entire search space for each time slot (the term "entire search space" refers to the entire set of CCEs corresponding to the union area of ​​multiple search space sets), and when the value of monitoringCapabilityConfig-r16 is configured as r16monitoringcapability for the UE, the UE defines the maximum value of the number of PDCCH candidates to be monitored and the maximum value of the number of CCEs constituting the entire search space for each span.

[0161] [Condition 1: Constraint on the maximum number of PDCCH candidates]

[0162] In using 15.2 μ In a cell configured with an SCS of 100 kHz, the maximum number of PDCCH candidates to be monitored by the UE when defined on a slot basis is M. μ The following Table 11 may be followed, and when defined based on span, the maximum number M of PDCCH candidates to be monitored by the UE is μ Table 12 may be followed, depending on the configuration values ​​of the above higher layer signaling.

[0163] [Table 11]

[0164]

[0165] [Table 12]

[0166]

[0167] [Condition 2: Constraint on the maximum number of CCEs]

[0168] In a cell configured with an SCS of 15·2 μ kHz, the maximum number of CCEs constituting the entire search space, C, is μ (The term "entire search space" refers to the entire set of CCEs corresponding to the union of multiple search space sets) Table 13 may be followed, and when defined based on span, the maximum number of CCEs constituting the entire search space, C μTable 14 may be followed, depending on the configuration values ​​of the above higher layer signaling.

[0169] [Table 13]

[0170]

[0171] [Table 14]

[0172]

[0173] For ease of explanation, a situation in which both Condition 1 and Condition 2 are satisfied at a specific time is defined as “Condition A.” Accordingly, failure to satisfy Condition A may mean that at least one of Condition 1 and Condition 2 is not satisfied.

[0174] [Rate Matching / Punching]

[0175] Hereinafter, the rate matching and puncturing operations will be described in detail.

[0176] When time-frequency resource A, where an arbitrary symbol sequence A is to be transmitted, overlaps with time-frequency resource B, rate matching or puncturing operations may be considered for transmission and reception operations in channel A, taking into account resource C corresponding to the overlapping region between resource A and resource B. Specific operations may be as follows.

[0177] Rate matching operation

[0178] The BS can transmit symbol sequence A by mapping channel A only to the remaining resource region after excluding resource C from the entire resource A in which symbol sequence A is transmitted to the UE, where resource C corresponds to the region overlapping resource B. For example, when symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A includes {resource #1, resource #2, resource #3, resource #4}, and resource B includes {resource #3, resource #5}, the BS can transmit symbol sequence A by sequentially mapping symbol sequence A to {resource #1, resource #2, resource #4}, where {resource #1, resource #2, resource #4} are the remaining resources after excluding {resource #3} corresponding to resource C from resource A. As a result, the BS can transmit the symbol sequence {symbol #1, symbol #2, symbol #3} by mapping them to {resource #1, resource #2, resource #4}, respectively.

[0179] The UE may determine resource A and resource B based on scheduling information for symbol sequence A from the BS, thereby determining resource C corresponding to the overlapping region between resource A and resource B. The UE may receive symbol sequence A assuming that symbol sequence A is transmitted by being mapped to the remaining region after excluding resource C from the entire resource A. For example, when symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A includes {resource #1, resource #2, resource #3, resource #4}, and resource B includes {resource #3, resource #5}, the UE may receive symbol sequence A assuming that symbol sequence A is sequentially mapped to {resource #1, resource #2, resource #4}, where {resource #1, resource #2, resource #4} are the remaining resources after excluding {resource #3} corresponding to resource C from resource A. As a result, the UE can assume that the symbol sequence {symbol #1, symbol #2, symbol #3} is transmitted by being mapped to {resource #1, resource #2, resource #4}, respectively, and perform a series of subsequent reception operations.

[0180] Punching operation

[0181] When there is resource C corresponding to a region overlapping with resource B in the entire resource A for sending symbol sequence A to the UE, the BS can map the symbol sequence A to the entire resource A, but can perform transmission only in the remaining resource region after excluding resource C from resource A, rather than performing transmission in the resource region corresponding to resource C. For example, when symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A includes {resource #1, resource #2, resource #3, resource #4}, and resource B includes {resource #3, resource #5}, the BS can map symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} to resource A {resource #1, resource #2, resource #3, resource #4} respectively, and only send the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to {resource #1, resource #2, resource #4}, where {resource #1, resource #2, resource #4} are the remaining resources from resource A after excluding {resource #3} corresponding to resource C, and do not send {symbol #3} mapped to {resource #3} corresponding to resource C. As a result, the BS can transmit the symbol sequence {symbol #1, symbol #2, symbol #4} by mapping them to {resource #1, resource #2, resource #4}, respectively.

[0182] The UE can determine resource A and resource B based on scheduling information for symbol sequence A from the BS, thereby determining resource C corresponding to the overlapping area between resource A and resource B. The UE can receive symbol sequence A assuming that symbol sequence A is mapped to the entire resource A but is transmitted only in the remaining area after excluding resource C from the entire resource A. For example, when symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A includes {resource #1, resource #2, resource #3, resource #4}, and resource B includes {resource #3, resource #5}, the UE can perform reception while assuming that symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} are mapped to resource A {resource #1, resource #2, resource #3, resource #4}, respectively, but {symbol #3} mapped to {resource #3} corresponding to resource C is not transmitted, and the symbol sequence {symbol #1, symbol #2, symbol #4} is transmitted by being mapped to {resource #1, resource #2, resource #4}, where {resource #1, resource #2, resource #4} are the remaining resources after excluding {symbol #3} corresponding to resource C from resource A. As a result, the UE can assume that the symbol sequence {symbol #1, symbol #2, symbol #4} is transmitted by being mapped to {resource #1, resource #2, resource #4}, respectively, and perform a series of subsequent reception operations.

[0183] A method for configuring rate matching resources for rate matching purposes in a 5G communication system is described. Rate matching refers to adjusting the size of a signal by taking into account the amount of resources available for signal transmission. For example, rate matching of a data channel may involve adjusting the size of the data by not mapping the data channel to a specific time-frequency resource region and not transmitting the data channel.

[0184] Figure 6 is a diagram for describing a method utilized by a BS and a UE to transmit and receive data by considering a DL data channel and rate matching resources according to an embodiment of the present disclosure.

[0185] exist Figure 6, a DL data channel (PDSCH) 601 and rate-matching resources 602 are shown. A base station (BS) can configure one or more rate-matching resources 602 for a UE through higher-layer signaling (e.g., RRC signaling). Configuration information for rate-matching resources 602 may include time-domain resource allocation information 603, frequency-domain resource allocation information 604, and period information 605. In the following description, the bitmap corresponding to frequency-domain resource allocation information 604 is referred to as the "first bitmap," the bitmap corresponding to time-domain resource allocation information 603 is referred to as the "second bitmap," and the bitmap corresponding to period information 605 is referred to as the "third bitmap." When all or some of the time-frequency resources of a scheduled data channel 601 overlap with the configured rate-matching resources 602, the BS can transmit the data channel 601 by rate-matching the data channel 601 in a portion of the rate-matching resources 602. The UE can then receive and decode the data channel 601, assuming that the data channel 601 is rate-matched in that portion of the rate-matching resources 602.

[0186] Through additional configuration, the base station can dynamically notify the UE via DCI (corresponding to the "rate matching indicator" in the aforementioned DCI format) whether rate matching should be performed on the data channel within that portion of the configured rate matching resources. Specifically, the base station can select some of the configured rate matching resources, group them into a rate matching resource group, and indicate to the UE via DCI in the form of a bitmap whether rate matching should be performed on the data channel for each rate matching resource group. For example, when four rate matching resources are configured (e.g., RMR#1, RMR#2, RMR#3, and RMR#4), the base station can configure RMG#1 = {RMR#1, RMR#2} and RMG#2 = {RMR#3, RMR#4} as rate matching groups. Using two bits in the DCI field, the base station can indicate to the UE via a bitmap whether rate matching should be performed within each of RMG#1 and RMG#2. For example, a "1" can be used to indicate when rate matching should be performed, while a "0" can be used to indicate when rate matching should not be performed.

[0187] Regarding a method of configuring UE using rate matching resources, 5G supports "RB symbol level granularity" and "RE level granularity". Specifically, the configuration method is as follows.

[0188] RB symbol level

[0189] The UE can configure up to 4 RateMatchPattern (rate matching mode) for each BWP through higher layer signaling, and a RateMatchPattern can include the following:

[0190] As reserved resources in a BWP, resources in a time-frequency resource region configured using a combination of a symbol-level bitmap and an RB-level bitmap on the frequency axis can be included. Reserved resources can span one or two time slots. A time domain pattern (periodicityAndPattern) can also be configured, in which a pair of RB-level and symbol-level bitmaps is repeated in the time and frequency domains.

[0191] - may include a time-frequency domain resource region configured as a CORESET in a BWP, and a resource region corresponding to a time-domain pattern configured using a search space configuration, wherein the time-frequency domain resource region is repeated in the search space configuration.

[0192] RE Level

[0193] The UE may configure the following contents through higher layer signaling.

[0194] - Configuration information for REs corresponding to the LTE cell-specific reference signal or common reference signal (CRS) pattern (lte-CRS-ToMatchAround), which may include the number of LTE CRS ports (nrofCRS-Ports), the LTE-CRS-vshift value (v-shift), the center subcarrier position information of the LTE carrier from the reference frequency point (e.g., reference point A) (carrierFreqDL), the bandwidth size information of the LTE carrier (carrierBandwidthDL), and the subframe configuration information corresponding to the multicast-broadcast single-frequency network (MBSFN) (mbsfn-SubframConfigList). The UE can determine the position of the CRS in the NR time slot corresponding to the LTE subframe based on the aforementioned information.

[0195] - Configuration information about resource sets corresponding to one or more zero-power (ZP) CSI-RSs in a BWP.

[0196] [PDSCH / PUSCH: Time Resource Allocation]

[0197] Hereinafter, a method for allocating time domain resources for a data channel in a next-generation mobile communication system (5G or NR system) will be described.

[0198] The base station can configure a table of time-domain resource allocation information for the downlink data channel (PDSCH) and the uplink data channel (PUSCH) for the UE via higher-layer signaling (e.g., RRC signaling). A table with up to 16 entries (maxNrofDL-Allocations = 16) can be configured for the PDSCH, and a table with up to 16 entries (maxNrofUL-Allocations = 16) can be configured for the PUSCH. In one embodiment, the time-domain resource allocation information may include PDCCH-PDSCH slot timing (the time interval in time slots between the time when a PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted by K0), PDCCH-PUSCH slot timing (the time interval in time slots between the time when a PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted by K2), information regarding the position of the starting symbol and the length of the symbol in which the PDSCH or PUSCH is scheduled within the slot, the mapping type of the PDSCH or PUSCH, and the like. For example, the information in Table 15 or Table 16 below may be transmitted from the BS to the UE.

[0199] [Table 15]

[0200]

[0201] [Table 16]

[0202]

[0203] The BS may notify the UE of one of the entries in the table of time domain resource allocation information (e.g., indicated by the "time domain resource allocation" field in the DCI) via L1 signaling (e.g., DCI). The UE may obtain the time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the BS.

[0204] Figure 8 An example of time domain resource allocation of a PDSCH in a wireless communication system according to an embodiment of the present disclosure is shown.

[0205] refer to Figure 8 , BS can be based on the SCS of data channel and control channel (μ PDSCH 、μ PDCCH ) to indicate the position of PDSCH resources on the time axis, where the data channel and control channel are configured using a higher layer, a scheduling offset value K0, and the starting position 8-00 and length 8-05 of the OFDM symbol in the time slot dynamically indicated in the DCI.

[0206] Figure 9An example of time domain resource allocation based on SCSs of data channels and control channels in a wireless communication system according to an embodiment of the present disclosure is shown.

[0207] refer to Figure 9 , when the data channel and control channel have the same SCS (μ PDSCH = μ PDCCH ) (9-00), the slot number is the same for data and control, so the BS and UE can generate a scheduling offset to match the predetermined slot offset K0. On the other hand, when the data channel and the control channel have different SCS (μ PDSCH ≠ μ PDCCH ) (9-05), the time slot numbers are different for data and control, so the BS and UE can generate a scheduling offset based on the SCS of the PDCCH to match the predetermined time slot offset K0.

[0208] [PDSCH: Frequency Resource Allocation]

[0209] Figure 7 An example of frequency domain resource allocation for PDSCH in a wireless communication system according to an embodiment of the present disclosure is shown.

[0210] Figure 7 Three frequency domain resource allocation methods that can be configured by higher layers in the NR wireless communication system are shown, namely, Type 0 7-00, Type 1 7-05, and dynamic switching 7-10.

[0211] refer to Figure 7 When the UE is configured to use only resource type 0 (7-00) via higher layer signaling, some DCI used to allocate PDSCH to the UE includes the N RBG The conditions for this will be described below. In this case, as shown in Table 17 below, N RGB It refers to the number of resource block groups (RBGs) determined according to the size of the BWP allocated by the BWP indicator and the higher-layer parameter rbg-Size, and data is transmitted in the RBG indicated as 1 in the bitmap.

[0212] [Table 17]

[0213]

[0214] When the UE is configured to use only resource type 1 via higher layer signaling (7-05), some DCI used to allocate PDSCH to the UE includes The frequency domain resource allocation information consists of 10 bits. The conditions for this will be described below. This allows the BS to configure the starting VRB 7-20 and the length 7-25 of the frequency domain resources continuously allocated from the starting VRB 7-20.

[0215] When the UE is configured to use both resource type 0 and resource type 1 (7-10) through higher layer signaling, some DCI for allocating PDSCH to the UE includes frequency domain resource allocation information consisting of multiple bits 7-35 corresponding to the payload 7-15 for configuring resource type 0 and the larger of the payloads 7-20 and 7-25 for configuring resource type 1. The conditions for this are described below. In this case, one bit can be added to the most significant bit (MSB) of the frequency domain allocation information in the DCI, and when the value of this bit is "0", it indicates that resource type 0 is used, and when the value of this bit is "1", it indicates that resource type 1 is used.

[0216] [PDSCH: VRB-PRB mapping]

[0217] In the above-described resource allocation type 1 (resource type 1), depending on a mapping method between VRBs and PRBs (VRB-PRB mapping), a non-interleaved mapping method or an interleaved mapping method may be applied.

[0218] In the non-interleaved mapping method, the nth VRB can be directly mapped to the nth PRB without interleaving. However, for a PDSCH scheduled using DCI format 1_0 transmitted in the common search space, the nth VRB can be mapped to the nth PRB. PRB. Here, It may correspond to the lowest PRB index of the control resource set (CORESET) in which the corresponding DCI is received.

[0219] In the interleaved mapping method, the nth VRB can be mapped to the f(n)th PRB through interleaving. Here, f(.) can correspond to an interleaving function. In this case, the interleaving operation can be performed in units of RB bundles, each RB bundle consisting of L RBs. The specific interleaved VRB-PRB mapping process can be performed according to the operation described below.

[0220] [Table 18]

[0221]

[0222]

[0223]

[0224] In the above interleaving mapping method, the UE may assume that the same precoding is applied within one PRB bundle.

[0225] According to the contents of Table 18 above, the PRB with the lowest CORESET index ( ) starts by allocating frequency domain resources for the PDSCH scheduled using DCI format 1_0 in the common search space.

[0226] The UE may receive an indication of whether the VRB-PRB mapping method is non-interleaved or interleaved via DCI (e.g., DCI format 1_0 and DCI format 1_1). If no VRB-PRB mapping method is indicated, the UE may assume non-interleaved mapping. The VRB-PRB Mapping Indicator field in the DCI format may conform to the contents of Table 19 below.

[0227] [Table 19]

[0228]

[0229] As described above, the PDSCH scheduled using DCI format 1_0 transmitted in the common search space can be mapped to the same number of The area corresponding to the PRB is sent, where The PRB is the PRB with the lowest index from the CORESET in which the corresponding DCI format 1_0 is transmitted within the active BWP Beginning, that is, with The frequency axis resource area corresponding to the PRB ( ) is defined as follows. If CORESET#0 is configured, then May correspond to the size of CORESET#0 (i.e., the number of frequency axis RBs constituting CORESET#0), and if CORESET#0 is not configured, then It may correspond to the size of the initial BWP (ie, the number of frequency-domain RBs constituting the initial BWP).

[0230] According to the contents of Table 18 above, the unit in which the PDSCH scheduled using DCI format 1_0 (i.e., DCI format 1_0 in which the CRC of the Type0 PDCCH common search space in CORESET#0 is scrambled by SI-RNTI) is mapped to the frequency domain may be an RB bundle unit. When CORESET#0 is configured for a UE, the number of RB bundles may be defined as In this case, the RB bundles are arranged in ascending order of the RB bundle index, the bundle size L may be 2, and the size of the transmission frequency domain ( ) can be the size of CORESET#0. The relationship between the size of the RB bundle and the size of the configured CORESET#0 If greater than 0, the last index The RB bundle can be composed of RBs so that all RB resources can be included in the bundle unit (i.e., bundles with indices other than the last index all consist of L RBs, but the bundle with the last index can consist of RBs).

[0231] According to the content of Table 18 above, DCI format 1_0 sent in the common search space (i.e., in the i-th BWP (starting position is The unit mapped to the frequency domain by the PDSCH scheduled by DCI format 1_0) sent in the common search space within the i-th BWP) can be an RB bundling unit. The number of RB bundling units of the UE can be defined as As mentioned above, It can be the size of BWP, The lowest RB index that can represent a CORESET, RB may be the starting RB index of the BWP, and L may represent the bundle size. In this case, the bundle size L may be 2. The RB bundle is a virtual RB bundle with indices arranged in ascending order and may be mapped to the same physical RB bundle as the physical RB. The area corresponding to the indices of the physical RB bundles arranged in ascending order. is the number of RBs included in the last indexed RB bundle, the last index is The RB bundle can be composed of RBs so that all RB resources can be included in the RB bundle unit. In this case, the number of RBs included in the first indexed RB bundle can be .

[0232] According to the contents of Table 18 above, a normally scheduled PDSCH (ie, a PDSCH not scheduled using DCI format 1_0 in the common search space) can be mapped to a total of (in is the size of the active BWP) to send the corresponding area, where is from the RB with the lowest index in the active BWP In this case, the unit mapped to the frequency domain may be an RB bundle unit. According to Table 18 above, the number of RB bundle units used for PDSCH transmission may be a total of and can be defined as .in this case, is the RB bundling bundle size within active BWP i and can be configured via the higher layer configuration parameter vrb-ToPRB-Interleaver according to Table 20.

[0233] RB bundles may be units constituting VRBs, and the number of RBs included in the first index and / or the last index RB bundle may be smaller than the configured RB bundle size. Therefore, the first indexed RB bundle can be represented by RBs. The RB bundle with the last index can be represented by the number of RBs that make it up. In this case, the condition can be In addition to the RB bundles of the first and last indexes above, other RB bundles can be configured by RBs.

[0234] The VRB index configured as an RB bundle may be as described in Table 18 ( ) is mapped to PRB. In this case, the function ( , , , , ) VRB index Mapped to PRB index. In this case, the last VRB index can be Mapping to PRB index The reason for mapping the last VRB index to the PRB is to prevent overlap with other indices that may appear when the f(j) function is used.

[0235] [Table 20]

[0236]

[0237]

[0238]

[0239]

[0240]

[0241] [PUSCH: Transmission Scheme]

[0242] Next, the PUSCH transmission scheduling scheme is described. PUSCH transmission can be dynamically scheduled by UL grant in DCI, or by configuring grant type 1 or type 2. The dynamic scheduling indication for PUSCH transmission can be indicated by DCI format 0_0 or DCT format 0_1.

[0243] Instead of receiving a UL grant in DCI, a configured grant type 1 PUSCH transmission may be semi-statically configured by receiving configuredGrantConfig including rrc-ConfiguredUplinkGrant of Table 21 via higher layer signaling. After receiving configuredGrantConfig not including rrc-ConfiguredUplinkGrant of Table 21 via higher layer signaling, a configured grant type 2 PUSCH transmission may be semi-persistently scheduled via a UL grant in DCI. When PUSCH transmission is operated with a configured grant, the parameters applied to the PUSCH transmission via higher layer signaling configuredGrantConfig of Table 21 apply, with the exception of dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by higher layer signaling pusch-Config of Table 22. When transformPrecoder is provided for the UE in the higher layer signaling configuredGrantConfig of Table 21, the UE applies tp-pi2BPSK in pusch-Config of Table 22 to PUSCH transmissions operated by the configured grant.

[0244] [Table 21]

[0245]

[0246]

[0247]

[0248]

[0249] Next, the PUSCH transmission method is described. The DMRS antenna ports used for PUSCH transmission are the same as the antenna ports used for SRS transmission. Depending on whether the value of txConfig in the higher-layer signaling pusch-Config in Table 22 is "codebook" or "nonCodebook", PUSCH transmission can follow a codebook-based transmission method or a non-codebook-based transmission method.

[0250] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, or semi-statically configured via a configuration grant. When a UE receives an indication of scheduling for PUSCH transmission via DCI format 0_0, the UE performs beam configuration for PUSCH transmission by using the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource, where the pucch-spatialRelationInfoID corresponds to the lowest ID in the active UL BWP in the serving cell. In this case, PUSCH transmission is based on a single antenna port. The UE does not expect PUSCH transmission to be scheduled via DCI format 0_0 in a BWP in which a PUCCH resource including pucch-spatialRelationInfo is not configured. When txConfig is not configured for the UE in pusch-Config of Table 22, the UE does not expect to be scheduled by DCI format 0_1.

[0251] [Table 22]

[0252]

[0253]

[0254]

[0255] Next, we describe codebook-based PUSCH transmission. Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, or semi-statically configured via a configuration grant. When codebook-based PUSCH transmission is dynamically scheduled via DCI format 0_1, or semi-statically configured via a configuration grant, the UE determines the precoder used for PUSCH transmission based on the SRS resource indicator (SRI), the transmission precoding matrix indicator (TPMI), and the transmission rank (number of PUSCH transmission layers).

[0256] In this case, the SRI can be given by the SRS resource indicator field in the DCI, or configured via higher layer signaling srs-ResourceIndicator. After codebook-based PUSCH transmission, the UE can be configured to have at least one SRS resource and up to two SRS resources. When the SRI is provided to the UE via DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources sent before the PDCCH including the SRI. Further, the TPMI and transmission rank can be given by the "Precoding Information and Number of Layers" field in the DCI, or configured via higher layer signaling precodingAndNumberOfLayers. TPMI is used to indicate the precoder to be applied to PUSCH transmission. When one SRS resource is configured for the UE, TPMI is used to indicate the precoder to be applied in the configured one SRS resource. When multiple SRS resources are configured for the UE, TPMI is used to indicate the precoder to be applied in the SRS resource indicated by SRI.

[0257] The precoder to be used for PUSCH transmission is selected from the UL codebook with the same number of antenna ports as the value of nrofSRS-Ports in the higher-layer signaling SRS-Config. In codebook-based PUSCH transmission, the UE determines the codebook subset based on the TPMI and the codebookSubset in the higher-layer signaling pusch-Config. Based on the UE capabilities reported by the UE to the BS, the codebookSubset in the higher-layer signaling pusch-Config can be configured with one of "fullyAndPartialAndNonCoherent", "partialAndNonCoherent", and "nonCoherent". When the UE reports "partialAndNonCoherent" as the UE capability, the UE does not expect the higher-layer signaling codebookSubset value to be set to "fullyAndPartialAndNonCoherent". When the UE reports "nonCoherent" as the UE capability, the UE does not expect the higher-layer signaling codebookSubset value to be set to "fullyAndPartialAndNonCoherent" or "PartialAndNonCoherent". When nrofSRS-Ports in the higher layer signaling SRS-ResourceSet indicates two SRS antenna ports, the UE does not expect the value of the higher layer signaling codebookSubset to be set to "partialAndNonCoherent".

[0258] The UE may be configured with one SRS resource set, where the usage value of the SRS resource set in the higher layer signaling SRS-ResourceSet is set to "codebook", and one SRS resource in the SRS resource set may be indicated by the SRI. When multiple SRS resources are configured in an SRS resource set, where the usage value of the SRS resource set in the higher layer signaling SRS-ResourceSet is set to "codebook", the UE expects that nrofSRS-Ports in the higher layer signaling SRS-Resource is set to the same value for all SRS resources.

[0259] The UE transmits one or more SRS resources included in an SRS resource set to the BS, where the usage value of the SRS resource set is set to "codebook" according to higher layer signaling, and the BS selects one of the SRS resources transmitted by the UE and indicates that the UE is allowed to perform PUSCH transmission by using the transmission beam information of the SRS resource. In this case, for codebook-based PUSCH transmission, SRI is used as information for selecting an index of an SRS resource and included in the DCI. In addition, the BS may include information indicating the TPMI and rank to be used by the UE for PUSCH transmission in the DCI. By using the SRS resource indicated by SR, the UE performs PUSCH transmission by applying the precoder indicated by the rank and TPMI indicated by the transmission beam based on the SRS resource.

[0260] Next, non-codebook-based PUSCH transmissions are described. Non-codebook-based PUSCH transmissions can be dynamically scheduled via DCI formats 0_0 or 0_1, or semi-statically via configuration grants. When at least one SRS resource is configured in an SRS resource set, where the usage value of the SRS resource set in the higher-layer signaling SRS-ResourceSet is set to "nonCodebook," non-codebook-based PUSCH transmissions can be scheduled for the UE via DCI format 0_1.

[0261] For an SRS resource set whose usage value in the higher layer signaling SRS-ResourceSet is set to "nonCodebook", the UE may be configured to have one associated non-zero power (NZP) CSI-RS resource. The UE may perform calculations on the precoder used for SRS transmission by measuring the NZP CSI-RS resource associated with the SRS resource set. When the gap between the last received symbol of the aperiodic NZP CSI-RS resource associated with the SRS resource set and the first symbol of the aperiodic SRS transmission from the UE is less than 42 symbols, the UE does not expect to update information on the precoder used for SRS transmission.

[0262] When the resourceType value in the higher layer signaling SRS-ResourceSet is set to "aperiodic", the associated NZP CSI-RS is indicated via the SRS request field in DCI format 0_1 ​​or 1_1. In this case, when the associated NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the presence of the associated NZP CSI-RS is indicated when the value of the SRS request field in DCI format 0_1 ​​or 1_1 is not "00". In this case, the DCI should not indicate cross-carrier or cross-BWP scheduling. Further, when the value of the SRS request indicates the presence of NZP CSI-RS, the NZP CSI-RS is located in the time slot in which the PDCCH including the SRS request field is transmitted. In this case, the TCI state in the scheduled subcarrier is not configured to have QCL-Type D.

[0263] When a periodic or semi-persistent SRS resource set is configured, the associated NZP CSI-RS may be indicated via the higher layer signaling associatedCSI-RS in SRS-ResourceSet. For non-codebook based transmission, the UE is not expected to be configured with both higher layer signaling spatialRelationInfo for SRS resources and associatedCSI-RS in higher layer signaling SRS-ResourceSet.

[0264] When multiple SRS resources are configured, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the BS. In this case, the SRI can be indicated by the SRS resource indicator field in the DCI, or configured by higher-layer signaling srs-ResourceIndicator. Similar to the above-mentioned codebook-based PUSCH transmission, when the SRI is provided to the UE via the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources sent before the PDCCH including the SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources in the SRS resource set that can be used for simultaneous transmission in the same symbol and the maximum number of SRS resources are determined by the UE capabilities reported by the UE to the BS. In this case, the SRS resources sent simultaneously by the UE occupy the same RB. The UE configures one SRS port for each SRS resource. Only one SRS resource set with the usage value set to "nonCodebook" in the higher layer signaling SRS-ResourceSet can be configured, and the maximum number of SRS resources that can be configured for non-codebook based PUSCH transmission is 4.

[0265] The BS transmits one NZP-CSI-RS associated with an SRS resource set to the UE, and the UE calculates a precoder to be used for transmission of one or more SRS resources in the SRS resource set based on measurement results during reception of the NZT-CSI-RS. The UE applies the calculated precoder when transmitting one or more SRS resources in the SRS resource set whose usage is set to "nonCodebook" to the BS, and the BS selects one or more SRS resources from among the one or more received SRS resources. In this case, for non-codebook-based PUSCH transmission, the SRI indication may represent an index of one of a plurality of SRS resources or a combination thereof, and the SRI is included in the DCI. The number of SRS resources indicated by the SRI transmitted from the BS may be the number of PUSCH transmission layers, and the UE transmits the PUSCH by applying the precoder applied to the SRS resource transmission to each layer.

[0266] [PUSCH: Preparation process time]

[0267] Next, we'll describe the PUSCH preparation process time. When a base station schedules a UE to transmit a PUSCH with DCI formats 0_0, 0_1, or 0-2, the UE may require the PUSCH preparation process time to transmit the PUSCH by applying the transmission method (SRS resource transmission precoding method, number of transmission layers, or spatial domain transmission filter) indicated via the DCI. With this in mind, NR has defined the PUSCH preparation process time. The UE's PUSCH preparation process time can be calculated according to Equation 2 below.

[0268] [Equation 2]

[0269]

[0270] T expressed by Equation 2 proc,2 The variables in can have the following meanings:

[0271] - N2: The number of symbols determined according to UE processing capability 1 or 2 depending on UE capabilities and the base parameter set μ. When UE capability 1 is reported according to the UE capability report, it may have the value in Table 23, and when UE processing capability 2 is reported in the UE capability report and UE processing capability 2 is configured to be enabled via higher layer signaling, it may have the value in Table 24.

[0272] [Table 23]

[0273]

[0274] [Table 24]

[0275]

[0276] - : When the REs of the first OFDM symbol are all configured to consist of only DM-RSs, the number of symbols is determined to be 0, otherwise, the number of symbols is determined to be 1.

[0277] - :64

[0278] - μ: In μ UL and μ DL Among them, it follows that T proc,2 Larger values. DL represents a basic parameter set for DL ​​in which a PDCCH including DCI scheduling a PUSCH is transmitted, and μ UL Indicates the basic parameter set in which the UL PUSCH is transmitted.

[0279] - T c :

[0280] - : When the DCI scheduling PUSCH indicates BWP switching, it follows the BWP switching time, otherwise, it is "0".

[0281] - : When the OFDM symbols of PUCCH, PUSCH with high priority index and PUCCH with low priority index overlap in time, the OFDM symbols of PUSCH with high priority index are used. value. Otherwise, is 0.

[0282] - T ext :When the UE uses the shared spectrum channel access solution, the UE can calculate T ext And apply it to the PUSCH preparation process time. Otherwise, assume T ext is 0.

[0283] - T switch : When the UL switching interval is triggered, T switch is assumed to be the switching interval. Otherwise, assume T switch is 0.

[0284] Taking into account the time domain resource mapping information of the PUSCH scheduled via DCI and the effect of UL-DL timing advance, when the first symbol of the PUSCH starts earlier than the first UL symbol and its CP is T from the last symbol of the PDCCH including the DCI that schedules the PUSCH proc,2 At the start of the subsequent process, the BS and the UE determine that the PUSCH preparation process time is insufficient. Otherwise, the BS and the UE determine that the PUSCH preparation process time is sufficient. The UE may send PUSCH only when the PUSCH preparation process time is sufficient, and may ignore DCI scheduling PUSCH when the PUSCH preparation process time is insufficient.

[0285] [SBFD: SBFD Overview]

[0286] Furthermore, 3GPP is discussing sub-band non-overlapping full-duplex (SBFD) as a new NR-based duplexing scheme. SBFD is a technology that can extend a UE's UL coverage by allowing a base station to use a portion of DL resources as UL resources in TDD spectrum at frequencies below or above 6 GHz to receive UL transmissions from the UE, and by reducing feedback delay by receiving feedback on DL transmissions from the UE using the increased UL resources. In this disclosure, a UE that can receive information from the base station regarding SBFD support and perform UL transmissions using a portion of DL resources is referred to as an SBFD-capable UE. To define the SBFD scheme in the standard and to enable an SBFD-capable UE to determine whether SBFD is supported in a specific cell (or at a specific frequency or band), the following methods are considered.

[0287] In the first approach, in addition to the existing frame structure types for unpaired spectrum (or time division duplex (TDD)) or paired spectrum (or frequency division duplex (FDD)), another frame structure type (e.g., frame structure type 2) can be introduced to define SBFD. Frame structure type 2 can be defined as supported within a specific frequency or frequency band, or the base station can indicate to the UE whether SBFD is supported via system information. An SBFD-capable UE can determine whether SBFD is supported in a specific cell (or within a specific frequency or frequency band) by receiving system information including whether SBFD is supported.

[0288] In the second method, whether SBFD is additionally supported in a specific frequency or band of existing unpaired spectrum (or TDD) can be indicated without defining a new frame structure type. In the second method, whether SBFD is additionally supported in a specific frequency or band of existing unpaired spectrum can be defined, or the base station can indicate whether SBFD is supported to the UE via system information. An SBFD-capable UE can determine whether SBFD is supported in a specific cell (or in a specific frequency or band) by receiving system information including whether SBFD is supported.

[0289] In the first method and the second method, the information on whether SBFD is supported may be information that indirectly indicates whether SBFD is supported by additionally configuring some DL resources as UL resources in addition to the configuration for TDD UL-DL resource configuration information indicating DL time slot (or symbol) resources and UL time slot (or symbol) resources in TDD (for example, as shown below in Figure 10 SBFD resource configuration information described in ), or it can be information directly indicating whether SBFD is supported.

[0290] Figure 10 is a diagram showing SBFD resource configuration information of the present disclosure.

[0291] As described above, the SBFD resource configuration information may be a configuration for TDD UL-DL resource configuration information indicating DL time slot resources and UL time slot resources in TDD by additionally configuring some DL resources as UL resources ( Figure 10 (b) to Figure 10 (d)). The UE can send the UL shared channel or control channel in the configured UL resources.

[0292] In the present disclosure, an SBFD-capable UE can achieve cell synchronization by receiving a synchronization signal block during initial cell access to connect to a cell (or BS). The process of achieving cell synchronization can be the same for both SBFD-capable UEs and existing TDD UEs. Subsequently, the SBFD-capable UE can determine whether the cell supports SBFD by obtaining the MIB or SIB or through a random access procedure.

[0293] The system information used to transmit information regarding support for SBFD may be system information that is distinguished from system information for UEs supporting different standard releases (e.g., existing TDD UEs) in the cell and transmitted separately. SBFD-capable UEs may determine whether SBFD is supported by obtaining all or part of the system information transmitted separately from the system information for existing TDD UEs. When only system information for existing TDD UEs or system information indicating that SBFD is not supported is obtained, the SBFD-capable UE may determine that the cell (or BS) supports only TDD.

[0294] When information on whether SBFD is supported is included in system information for UEs supporting a different version of the standard (e.g., existing TDD UEs), the information on whether SBFD is supported may be inserted at the end to avoid affecting the acquisition of system information for existing TDD UEs. If an SBFD-capable UE fails to obtain the information on whether SBFD is supported inserted at the end, or obtains information indicating that SBFD is not supported, the SBFD-capable UE may determine that the cell (or BS) supports only TDD.

[0295] When information on whether SBFD is supported is included in system information for UEs supporting different versions of the standard (e.g., existing TDD UEs), the information on whether SBFD is supported can be sent on a separate PDSCH to avoid affecting the acquisition of system information for existing TDD UEs. In other words, UEs that do not support SBFD can receive a first SIB (or SIB1) including existing TDD-related system information on a first PDSCH. UEs that support SBFD can receive a first SIB (or SIBs) including existing TDD-related system information on a first PDSCH, and a second SIB including SBFD-related system information on a second PDSCH. Here, the first PDSCH and the second PDSCH can be scheduled by a first PDCCH and a second PDCCH, respectively, and the CRCs of the first and second PDCCHs can be scrambled by the same RNTI (e.g., SI-RNTI). Control resource information (e.g., search space and / or CORESET information) for monitoring the second PDCCH may be obtained from system information on the first PDSCH, but when not obtained (i.e., when the system information of the first PDSCH does not include information about the search space), a UE supporting SBFD may receive the second PDCCH in the same search space as that of the first PDCCH.

[0296] As described above, when the SBFD-capable UE determines that the cell (or BS) supports only TDD, the SBFD-capable UE may perform a random access procedure and transmit and receive data / control signals in the same manner as an existing TDD UE.

[0297] The BS may configure separate random access resources for each of existing TDD UEs or SBFD-capable UEs (e.g., SBFD-capable UEs supporting duplex communication and SBFD-capable UEs supporting half-duplex communication), and transmit configuration information for the random access resources (control information or configuration information indicating time-frequency resources to be used for the PRACH) to the SBFD-capable UEs via system information. The system information used to transmit information regarding the random access resources may be distinguished from system information for UEs supporting different standard releases within the cell (e.g., existing TDD UEs) and transmitted separately.

[0298] By configuring separate random access resources for TDD UEs and SBFD UEs supporting different standard releases, the BS can distinguish whether random access is performed by a TDD UE supporting different standard releases or by an SBFD UE. For example, the separate random access resources configured for SBFD-capable UEs may be resources determined as DL time resources by existing TDD UEs, and SBFD-capable UEs may perform random access via UL resources (or separate random access resources) configured at some frequencies of the DL time resources. This allows the BS to determine that a UE attempting random access in the UL resources is an SBFD-capable UE.

[0299] Alternatively, the BS may not configure separate random access resources for SBFD-capable UEs, but may configure common random access resources for all UEs in the cell. In this case, the configuration information for the random access resources may be sent to all UEs in the cell via system information, and the SBFD-capable UEs that have received the system information may perform random access by using the random access resources. Thereafter, the SBFD-capable UE may complete the random access procedure and proceed to the RRC access mode for sending and receiving data to and from the cell. After the RRC access mode, the SBFD-capable UE may receive a higher layer or physical signal from the BS that may determine that some frequency resources of the DL time resources are configured as UL resources, and may perform SBFD operations, for example, sending UL signals in the configured UL resources.

[0300] When an SBFD-capable UE determines that a cell supports SBFD, the SBFD-capable UE may notify the BS that the UE attempting to connect to it is an SBFD-capable UE by transmitting capability information to the BS. The capability information includes at least one of whether the UE supports SBFD, whether the UE supports full-duplex or half-duplex communication, or the number of transmit or receive antennas it has (or supports). If support for half-duplex communication is mandatory for SBFD-capable UEs, whether the UE supports half-duplex communication may not be included in the capability information. After completing a random access procedure or after entering an RRC access mode for transmitting and receiving data to and from a cell, the SBFD-capable UE may report the capability information to the BS through a random access procedure.

[0301] An SBFD UE can support half-duplex communication, performing only UL transmission or DL ​​reception at a time, like an existing TDD UE, or full-duplex communication, performing both UL transmission and DL reception simultaneously. Therefore, the SBFD UE can report to the base station via a capability report whether it supports half-duplex or full-duplex communication. Following the report, the base station can configure the SBFD-capable UE to transmit and receive signals to the base station using half-duplex or full-duplex communication. When an SBFD-capable UE reports its half-duplex communication capability to the base station, since it generally lacks a duplexer, a switching gap may be required to change the RF frequency between transmission and reception when operating in FDD or TDD.

[0302] Generally speaking, based on the system information obtained during the cell search process for a cell and synchronization with the network, the UE can establish a radio link with the network through a random access procedure. Random access can be performed using a contention-based method or a contention-free method. When the UE performs cell selection and reselection during the initial access process for a cell, for example, when the UE moves from the RRC_IDLE state to the RRC_CONNECTED state, a contention-based random access method can be used. Contention-free random access can be used to reestablish UL synchronization in the case of DL data arrival, handover, or position measurement.

[0303] In this disclosure, a method for PDSCH frequency resource allocation and mapping in a SBFD system is described. In one embodiment, this method may include a method for scheduling PDSCH without considering the UL subband of the SBFD system. In one embodiment, this method may include a method for scheduling PDSCH by considering a portion of RBGs.

[0304] <VRB Allocation and VRB-PRB Mapping Without Considering UL Subband>

[0305] In one embodiment of the present disclosure, the UE may determine the starting VRB index and the number of consecutive VRBs of the VRBs scheduled for the PDSCH via a type 1 frequency domain resource assignment (FDRA) transmitted from the BS. The UE may determine the PRBs corresponding to the scheduled VRBs through VRB-PRB mapping. The UE may receive the PDSCH in the determined PRBs. In the event that some of the determined PRBs are included in the UL subband, the UE may receive the PDSCH assuming that the PDSCH is not transmitted in these PRBs. In other words, although the PRBs are scheduled via type 1 FDRA, the PDSCH may be received only in the remaining PRBs after excluding the PRBs overlapping with the UL subband.

[0306] Note that the overlap of the UL subband and the PRB may be determined using at least one of the following methods.

[0307] In the first method, when at least one RE in the PRB of the scheduled symbol overlaps with at least one RE allocated to the UL subband, it can be determined that the PRB is overlapped. Here, the scheduled symbol can be indicated by the time domain resource assignment (or TDRA (time domain resource assignment)) within the DCI format that schedules the PDSCH.

[0308] In the second method, when at least one of the REs in the PRB of the DMRS scheduling symbol overlaps with at least one of the REs allocated to the UL subband, it can be determined that the PRBs are overlapped. Here, the DMRS scheduling symbol refers to a symbol in which the DMRS is transmitted among the symbols scheduled for the PDSCH indicated by the time domain resource assignment (TDRA) within the DCI format that schedules the PDSCH.

[0309] For example, reference Figure 11 Assume that the DL BWP configured for the UE includes 10 RBs. RBs can be indexed using VRB indices and PRB indices, respectively. That is, the lowest VRB along the frequency axis in the DL BWP can be indexed as VRB 0, and the lowest PRB along the frequency axis can be indexed as PRB 0. Subsequent RBs can be indexed in increasing order of frequency. In this case, the PRB allocated to the UL subband can be assumed to be PRB 4.

[0310] refer to Figure 11 , the UE can create a bundle by bundling VRBs and PRBs separately in the DL BWP. The bundle created by bundling VRBs may be referred to as a VRB bundle, and the bundle created by bundling PRBs may be referred to as a PRB bundle. The length of the bundle (bundle size) may be configured via a higher layer signal. The value of the bundle size may be 2 or 4. In Figure 10, 10 VRBs and 10 PRBs can be bundled into 6 bundles respectively. VRB bundle #0 includes {VRB 0}, VRB bundle #1 includes {VRB 1, VRB 2}, VRB bundle #2 includes {VRB 3, VRB 4}, VRB bundle #3 includes {VRB 5, VRB 6}, VRB bundle #4 includes {VRB 7, VRB 8}, and VRB bundle #5 includes {VRB 9}. PRB bundle #0 includes {PRB 0}, PRB bundle #1 includes {PRB 1, PRB 2}, PRB bundle #2 includes {PRB 3, PRB4}, PRB bundle #3 includes {PRB 5, PRB 6}, PRB bundle #4 includes {PRB 7, PRB 8}, and PRB bundle #5 includes {PRB 9}. According to the VRB-PRB mapping representation, the bundles can be mapped as follows.

[0311] VRB bundle 0 -> PRB bundle 0

[0312] VRB bundle 1 -> PRB bundle 3

[0313] VRB bundle 2 -> PRB bundle 1

[0314] VRB Bundle 3 -> PRB Bundle 4

[0315] VRB Bundle 4 -> PRB Bundle 2

[0316] VRB Bundle 5 -> PRB Bundle 5

[0317] For example, when VRB 4, VRB 5, VRB 6, VRB 7, and VRB 8 are scheduled via a Type 1 FDRA received by the UE, the UE may determine that PRB 2, PRB 7, PRB 8, PRB 3, and PRB 4 are scheduled according to the VRB-PRB mapping expression. In addition, the UE may assume that PDSCH cannot be transmitted in PRB 4, which overlaps with the UL subband among the PRBs, and receive PDSCH only in PRB 2, PRB 7, PRB 8, and PRB 3.

[0318] Note that 5 VRBs are scheduled for the UE, but when calculating the transport block (TB) length, the UE can use the 4 PRBs actually used for reception. That is, the determined TB length can be proportional to the number of PRBs actually used for reception.

[0319] <VRB-PRB Mapping Considering Partial RBGs>

[0320] In one embodiment of the present disclosure, VRBs are scheduled for a UE via a Type 1 FDRA. For example, assume a DL BWP includes 273 VRBs. In this case, 16 bits are required for the Type 1 FDRA. (The number of bits required is ceil(log2(N*(N+1) / 2), where N is the number of VRBs included in the DL BWP.) Assume that the UE is configured with an UL subband. Assuming the UL subband includes 100 RBs, the actual number of scheduled PRBs may be 173 (=273-100). For a Type 1 FDRA indication that only considers schedulable PRBs, the number of bits required is 14. Therefore, two unnecessary bits may be included. The present disclosure discloses a method utilized by a base station to schedule only the PRBs available for scheduling by considering the UL subband.

[0321] UE can index VRBs and PRBs by considering UL sub-bands. Figure 12 , assuming that the DL BWP configured for a UE includes 10 RBs. VRB indices and PRB indices can be assigned by taking into account the UL subband. That is, the lowest VRB along the frequency axis in the DL BWP can be indexed as VRB 0, and the lowest PRB along the frequency axis can be indexed as PRB 0. Subsequent RBs can be indexed in increasing order of frequency. Here, VRBs and PRBs that overlap with the UL subband can be excluded from the index. Therefore, even if the DL BWP includes 10 RBs, the VRB indices and PRB indices are each numbered from 0 to 7.

[0322] refer to Figure 12 , the UE can create a bundle by bundling VRBs and PRBs separately. Specifically, the method of creating a bundle is as follows. Assume that L is the bundle size.

[0323] - The UE can determine the number of DL subbands based on the UL subband configuration. A DL subband consists of contiguous RBs that remain in the DL BWP after excluding the RBs in the UL subband. If the UL subband is located in the lowest-numbered RB or the highest-numbered RB in the DL BWP, the UE has one DL subband within the DL BWP. However, if the UL subband is located in the mid-frequency region of the DL BWP, the UE has a first DL subband below the UL subband and a second DL subband above the UL subband in a frequency region within the DL BWP.

[0324] -Assume there is 1 DL subband. Also assume the starting RB index of the DL subband is , and the number of RBs included in the DL subband is Here, the RB index is the common RB (CRB) index. In this case, the number of bundles obtained is , bundle 0 includes RBs, and if , then the bundle include RB, otherwise, bundle Includes L RBs. The remaining bundles (except bundle 0 and bundle The bundles other than the RBs) each include L RBs.

[0325] -Assume there are 2 DL subbands. Assume the starting RB index of the first DL subband is , and the number of RBs included in the first DL subband is . It is also assumed that the starting RB index of the second DL subband is , and the number of RBs included in the second DL subband is Here, the RB index is the CRB index. In this case, the number of bundles is obtained as .here, is an RB bundle included in the first DL subband, and is an RB bundling bundle included in the second DL subband. Note that RBs included in the first DL subband and RBs included in the second DL subband cannot be bundled into one bundling bundle. ,and Bundle 0 includes RBs, and if , then the bundle include RB, otherwise, bundle Includes L RBs. Bundle include RBs, and if , then the bundle include RB, otherwise, bundle Includes L RBs. The remaining bundles (except bundle 0, bundle , bundle and bundles The bundles other than the RBs) each include L RBs.

[0326] refer to Figure 12 , the UE can determine that there are two DL subbands, where the starting RB index of the first DL subband is , and the number of RBs included in the first DL subband is The starting RB index of the second DL subband is , and the number of RBs included in the second DL subband is .

[0327] VRBs and PRBs can each be bundled into 6 bundles. VRB bundle #0 includes {VRB 0}, VRB bundle #1 includes {VRB 1, VRB 2}, VRB bundle #2 includes {VRB 3}, VRB bundle #3 includes {VRB 4}, VRB bundle #4 includes {VRB 5, VRB 6}, and VRB bundle #5 includes {VRB 7}. PRB bundle #0 includes {PRB 0}, PRB bundle #1 includes {PRB 1, PRB 2}, PRB bundle #2 includes {PRB 3}, PRB bundle #3 includes {PRB 4}, PRB bundle #4 includes {PRB 5, PRB 6}, and PRB bundle #5 includes {PRB 7}.

[0328] According to the VRB-PRB mapping expression, the UE can perform mapping as follows.

[0329] VRB bundle #0 -> PRB bundle #0

[0330] VRB Bundle #1 -> PRB Bundle #3

[0331] VRB Bundle #2 -> PRB Bundle #1

[0332] VRB Bundle #3 -> PRB Bundle #4

[0333] VRB Bundle #4 -> PRB Bundle #2

[0334] VRB Bundle #5 -> PRB Bundle #5

[0335] However, in this case, the UE can perform mapping between VRB bundles and PRB bundles containing different numbers of RBs. For example, VRB bundle #1 includes two VRBs {VRB 1, VRB 2}, while the corresponding PRB bundle #3 includes one PRB {PRB 4}. For example, VRB bundle #2 includes one VRB {VRB 3}, while the corresponding PRB bundle #1 includes two PRBs {PRB 1, PRB 2}. This may cause the following problems.

[0336] When VRB 1 is scheduled for the first UE and VRB 2 is scheduled for the second UE, the two UEs receive PDSCH in the same PRB (PRB4). As a result, these RBs are different in the VRB domain, but may be the same RB in the PRB domain. Therefore, this conflict needs to be avoided.

[0337] The present disclosure provides a VRB-PRB mapping method to try to solve this problem.

[0338] In the first method, the UE bundles VRBs Mapping to PRB bundles , and bundle VRB Mapping to PRB bundles (Note that VRB bundles Mapped to PRB bundle ). The mapping of the remaining VRB bundles and PRB bundles is determined according to the interleaving function. For this purpose, the VRB bundles may be re-indexed. It is assumed that the new index is called the interleaving index of the VRB bundle. The interleaving index of the VRB bundle can be determined by excluding the VRB bundles in the order of increasing frequency starting from 0. and VRB bundle The remaining VRB bundles are obtained by indexing them. The PRB bundles may be re-indexed. Assume that the new index is called the interleaving index of the PRB bundle. The interleaving index of the PRB bundle can be obtained by excluding the PRB bundles in the order of increasing frequency starting from 0. and PRB bundle The remaining PRB bundles are indexed to obtain the result. For example, refer to Figure 13 , the interleaving index of VRB bundle #0 may be numbered 0, the interleaving index of VRB bundle #1 may be numbered 1, the interleaving index of VRB bundle #4 may be numbered 2, and the interleaving index of VRB bundle #5 may be numbered 3. The interleaving index of PRB bundle #0 may be numbered 0, the interleaving index of PRB bundle #1 may be numbered 1, the interleaving index of PRB bundle #4 may be numbered 2, and the interleaving index of PRB bundle #5 may be numbered 3. The UE may perform interleaving based on the interleaving index.

[0339] That is, the interleaving index of the VRB bundle Can be mapped to the interleaving index f(j) of the VRB bundle. Here, is the number of bundles used for interweaving, and The interleaving function f(j) can be obtained as follows.

[0340]

[0341]

[0342]

[0343]

[0344]

[0345]

[0346] According to the above function, the following mapping can be obtained.

[0347] VRB bundle #0 -> PRB bundle #0

[0348] VRB Bundle #1 -> PRB Bundle #4

[0349] VRB Bundle #2 -> PRB Bundle #2

[0350] VRB Bundle #3 -> PRB Bundle #3

[0351] VRB Bundle #4 -> PRB Bundle #1

[0352] VRB Bundle #5 -> PRB Bundle #5

[0353] In the second method, when VRB bundle When L VRBs are not included, the UE bundles the VRBs Mapping to PRB bundles In addition, when VRB bundles When L VRBs are not included, the UE bundles the VRBs Mapping to PRB bundles That is, the UE maps a VRB bundle whose size is smaller than the configured bundle size to a PRB bundle having the same index as the VRB bundle, thereby keeping the number of RBs included in each of the mapped VRB bundle and the PRB bundle the same. The mapping between the remaining VRB bundles and the remaining PRB bundles is determined according to the interleaving function. Subsequently, except for Otherwise, the interleaving method is performed in the same manner. is the number of VRB bundles used for interleaving, and if VRB bundle and VRB bundle Both include L VRBs, then ; If VRB bundle and VRB bundle One of includes L VRBs, and the other does not include L VRBs, then ; and if VRB bundle and VRB bundle Does not include L VRBs, then .

[0354] Figure 14 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0355] refer to Figure 14 The UE may include a transceiver, a memory (not shown), and a UE processor 1405 (or UE controller or processor), where the transceiver refers to the UE receiver 1400 and the UE transmitter 1410. The UE transceiver (1400 and 1410), memory, and UE processor 1405 may operate according to the above-described communication method of the UE. However, the components of the UE are not limited to the above examples. For example, the UE may include more or fewer components than those described above. Furthermore, the transceiver, memory, and processor may be implemented in the form of a single chip.

[0356] A transceiver can transmit and receive signals to and from a base station (BS). The signals may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of transmitted signals, and an RF receiver for low-noise amplifying and down-converting received signals. However, this is merely an example of a transceiver, and the components of a transceiver are not limited to an RF transmitter and an RF receiver.

[0357] In addition, the transceiver may receive a signal via a wireless channel and output the signal to the processor, and transmit a signal output from the processor via the wireless channel.

[0358] The memory can store programs and data necessary for the operation of the UE. Furthermore, the memory can store control information or data included in signals transmitted and received by the UE. The memory can include storage media (such as read-only memory (ROM), random access memory (RAM), a hard disk, a compact disc (CD)-ROM, and a digital versatile disc (DVD)) or a combination of storage media. Furthermore, the memory can be multiple memories.

[0359] The processor may also control a series of processes for the UE to operate according to the above-described embodiments. For example, the processor may control the components of the UE to receive DCI consisting of two layers while simultaneously receiving multiple PDSCHs. The processor may be configured as multiple processors and may execute programs stored in a memory to perform operations for controlling the components of the UE.

[0360] Figure 15 The structure of a BS in a wireless communication system according to an embodiment of the present disclosure is shown.

[0361] refer to Figure 15The BS may include a transceiver, a memory (not shown), and a BS processor 2105 (or BS controller or processor), where the transceiver refers to the BS receiver 1510 and the BS transmitter 1510. The BS transceivers (1500 and 1510), the memory, and the BS processor 1505 may operate according to the above-described communication method of the BS. However, the components of the BS are not limited to the above examples. For example, the BS may include more or fewer components than those described above. Furthermore, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

[0362] A transceiver can transmit and receive signals to and from a UE. The signals may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of transmitted signals, and an RF receiver for low-noise amplifying and down-converting the frequency of received signals. However, this is merely an embodiment of a transceiver, and the components of a transceiver are not limited to an RF transmitter and an RF receiver.

[0363] In addition, the transceiver may receive a signal via a wireless channel and output the signal to the processor, and transmit a signal output from the processor via the wireless channel.

[0364] The memory can store programs and data necessary for the operation of the BS. Furthermore, the memory can store control information or data included in signals transmitted and received by the BS. The memory can include storage media (such as ROM, RAM, hard disk, CD-ROM, and DVD) or a combination of storage media. Furthermore, the memory can be multiple memories.

[0365] The processor may also control a series of processes for the BS to operate according to the above-described embodiments of the present disclosure. For example, the processor may control the components of the BS to configure and transmit two layers of DCI, where the two layers of DCI include allocation information for multiple PDSCHs. The processor may be configured as multiple processors and may execute programs stored in a memory to perform operations for controlling the components of the BS.

[0366] The methods according to the embodiments described in the claims of the present disclosure or in its specification may be implemented in hardware, software, or a combination of hardware and software.

[0367] When these methods are implemented in software, a computer-readable storage medium may be provided that has one or more programs (software modules) stored thereon. The one or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to perform the methods according to the embodiments described in the claims of this disclosure or in its specification.

[0368] The program (software module or software) may be stored in RAM, non-volatile memory including flash memory, ROM, electrically erasable programmable ROM (EEPROM), magnetic disk storage devices, CD-ROMs, DVDs or other types of optical storage devices, and magnetic tape cassettes. Alternatively, the program may be stored in a memory that includes a combination of some or all of the aforementioned devices. Multiple such devices may be included in the memory.

[0369] Furthermore, the program may be stored in an attachable storage device accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or a combination thereof. The storage device may be connected to the apparatus for executing the embodiments of the present disclosure via an external port. Furthermore, a separate storage device on the communication network may also be connected to the apparatus for executing the embodiments of the present disclosure.

[0370] In specific embodiments of the present disclosure, components included in the present disclosure are expressed in the singular or plural form, depending on the specific embodiment presented. However, the choice of singular or plural expression is to suit the situation presented for ease of description, and the present disclosure is not limited to elements in the singular or plural form, that is, an element expressed in the plural form can be configured as a single element, or an element expressed in the singular form can be configured as multiple elements.

[0371] Moreover, the embodiments of the present disclosure disclosed in the specification and the drawings are provided only as specific examples in order to easily describe the technical ideas of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it is obvious to those skilled in the art that other modifications can be made based on the technical spirit of the present disclosure. Further, these embodiments can be combined with each other for operation when necessary. For example, one embodiment of the present disclosure and parts of another embodiment thereof can be combined with each other to operate the BS and the UE. For example, the first embodiment of the present disclosure and parts of the second embodiment thereof can be combined with each other to operate the BS and the UE. Further, although embodiments are provided for FDD LTE systems, other modifications based on the technical ideas of these embodiments can also be implemented in other systems such as TDD LTE systems, 5G or NR systems.

[0372] Also, in the drawings illustrating the methods of the present disclosure, the order of description does not necessarily correspond to the order of execution, and the methods may be executed in the reverse order or in parallel.

[0373] Alternatively, the drawings illustrating the method of the present disclosure may not include some elements and may include only some elements without damaging the essence of the present disclosure.

[0374] Further, the method of the present disclosure may be practiced in combination with some or all of the contents included in each embodiment within the scope not departing from the essence of the present disclosure.

[0375] Various embodiments of the present disclosure have been described. The above description of the present disclosure is provided for illustration, and the embodiments of the present disclosure are not limited to the disclosed embodiments. It will be understood by those skilled in the art that changes in form and detail can be easily made thereto without departing from the technical ideas or basic features of the present disclosure. The scope of the present disclosure is defined not by its detailed description but by the appended claims, and all changes or modifications within the meaning and scope of the appended claims and their equivalents should be interpreted as included within the scope of the present disclosure.

[0376] According to an embodiment of the present disclosure, a method performed by a UE may include receiving frequency domain resource assignment information from a BS.

[0377] According to an embodiment of the present disclosure, the method performed by the UE may include identifying at least one VRB associated with reception of the PDSCH based on frequency domain resource assignment information.

[0378] According to an embodiment of the present disclosure, the method performed by the UE may include mapping the identified at least one VRB to at least one PRB.

[0379] According to an embodiment of the present disclosure, the method performed by the UE may include identifying whether the mapped at least one PRB overlaps with a UL subband.

[0380] According to an embodiment of the present disclosure, the method performed by the UE may include: when at least one mapped PRB is identified as overlapping with a UL subband, receiving PDSCH in at least one PRB after excluding at least one PRB overlapping with the UL subband from the at least one mapped PRB.

[0381] According to an embodiment of the present disclosure, the method performed by the UE may include: when the mapped at least one PRB is identified as not overlapping with the UL subband, receiving the PDSCH in the mapped at least one PRB.

[0382] According to an embodiment of the present disclosure, the method performed by the UE may include: when at least one RE included in the UL subband overlaps with at least one RE associated with reception of a PDSCH, identifying the mapped at least one PRB as overlapping with the UL subband.

[0383] According to an embodiment of the present disclosure, at least one RE associated with the reception of PDSCH may include at least one RE included in at least one PRB of at least one symbol, wherein the at least one symbol is indicated based on the time domain resource assignment information in the DCI format for scheduling the PDSCH.

[0384] According to an embodiment of the present disclosure, the at least one symbol may include at least one symbol in which a DMRS is transmitted.

[0385] According to an embodiment of the present disclosure, the method performed by the UE may include bundling at least one VRB and at least one PRB based on a higher layer signal.

[0386] According to an embodiment of the present disclosure, the method performed by the UE may include mapping the bundled at least one VRB to the bundled at least one PRB.

[0387] According to an embodiment of the present disclosure, a UE may include a transceiver and at least one processor connected to the transceiver.

[0388] At least one processor may be configured to receive frequency domain resource assignment information from a BS.

[0389] The at least one processor may be configured to identify at least one VRB associated with reception of the PDSCH based on the frequency domain resource assignment information.

[0390] The at least one processor may be configured to map the identified at least one VRB to at least one PRB.

[0391] The at least one processor may be configured to identify whether the mapped at least one PRB overlaps with a UL subband.

[0392] The at least one processor may be configured to, when the mapped at least one PRB is identified as overlapping with a UL subband, receive the PDSCH in at least one PRB after excluding the at least one PRB overlapping with the UL subband from the mapped at least one PRB.

[0393] The at least one processor may be configured to receive the PDSCH in the mapped at least one PRB when the mapped at least one PRB is identified as not overlapping with a UL subband.

[0394] The at least one processor may be configured to, when at least one RE included in the UL subband overlaps with at least one RE associated with reception of the PDSCH, identify the mapped at least one PRB as overlapping with the UL subband.

[0395] The at least one processor may be configured to bundle at least one VRB and at least one PRB based on a higher layer signal.

[0396] The at least one processor may be configured to map the bundled at least one VRB to the bundled at least one PRB.

[0397] According to an embodiment of the present disclosure, a method performed by a BS may include mapping at least one VRB associated with transmission of a PDSCH to at least one PRB.

[0398] According to an embodiment of the present disclosure, the method performed by the BS may include identifying whether at least one VRB overlaps with a UL subband.

[0399] According to an embodiment of the present disclosure, the method performed by the BS may include: when at least one VRB is identified as overlapping with a UL subband, transmitting a PDSCH in at least one PRB after excluding at least one PRB corresponding to at least one VRB overlapping with the UL subband from the mapped at least one PRB.

[0400] According to an embodiment of the present disclosure, the method performed by the BS may include: when at least one VRB is identified as not overlapping with a UL subband, transmitting the PDSCH in the mapped at least one PRB.

[0401] According to an embodiment of the present disclosure, a BS may include a transceiver and at least one processor connected to the transceiver.

[0402] The at least one processor may be configured to map at least one VRB associated with transmission of the PDSCH to at least one PRB.

[0403] The at least one processor may be configured to identify whether at least one VRB overlaps with a UL subband.

[0404] The at least one processor may be configured to, when at least one VRB is identified as overlapping with a UL subband, transmit the PDSCH in at least one PRB after excluding at least one PRB corresponding to the at least one VRB overlapping with the UL subband from the mapped at least one PRB.

[0405] The at least one processor may be configured to transmit the PDSCH in the mapped at least one PRB when the at least one VRB is identified as not overlapping with the UL subband.

[0406] The at least one processor may be configured to transmit frequency-domain resource assignment information for at least one VRB associated with transmission of the PDSCH to the UE.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving frequency domain resource assignment information from a base station; identifying at least one virtual resource block (VRB) associated with reception of a physical downlink shared channel (PDSCH) based on the frequency domain resource assignment information; mapping the identified at least one VRB to at least one physical resource block (PRB); Identifying whether the mapped at least one PRB overlaps with an uplink subband; as well as When the mapped at least one PRB is identified as overlapping with the uplink subband, the PDSCH is received in at least one PRB after excluding the at least one PRB overlapping with the uplink subband from the mapped at least one PRB.

2. The method according to claim 1, further comprising: When the mapped at least one PRB is identified as not overlapping with the uplink subband, the PDSCH is received in the mapped at least one PRB.

3. The method of claim 1 , wherein the identifying whether the mapped at least one PRB overlaps with the uplink subband comprises: When at least one resource element (RE) included in the uplink subband overlaps with at least one RE associated with reception of the PDSCH, the mapped at least one PRB is identified as overlapping with the uplink subband.

4. The method according to claim 3, wherein the at least one RE associated with the reception of the PDSCH includes at least one RE included in at least one PRB of at least one symbol, and the at least one symbol is indicated based on time domain resource assignment information in a downlink control information (DCI) format that schedules the PDSCH. The method of claim 3 , wherein the at least one symbol comprises at least one symbol in which a demodulation reference signal (DMRS) is transmitted.

6. The method of claim 1 , wherein mapping the identified at least one VRB to the at least one PRB comprises: bundling the at least one VRB and the at least one PRB based on a higher layer signal; as well as The bundled at least one VRB is mapped to the bundled at least one PRB.

7. A user equipment (UE) in a wireless communication system, the UE comprising: transceiver; as well as at least one processor connected to the transceiver, wherein the at least one processor is configured to Receive frequency domain resource assignment information from the base station, identifying at least one virtual resource block (VRB) associated with reception of a physical downlink shared channel (PDSCH) based on the frequency domain resource assignment information, mapping the identified at least one VRB to at least one physical resource block (PRB), identifying whether the mapped at least one PRB overlaps with an uplink subband, and When the mapped at least one PRB is identified as overlapping with the uplink subband, the PDSCH is received in at least one PRB after excluding the at least one PRB overlapping with the uplink subband from the mapped at least one PRB.

8. The UE of claim 7, wherein the at least one processor is further configured to: receive the PDSCH in the mapped at least one PRB when the mapped at least one PRB is identified as not overlapping with the uplink subband.

9. The UE of claim 7, wherein the at least one processor is further configured to: identify the mapped at least one PRB as overlapping with the uplink subband when at least one resource element (RE) included in the uplink subband overlaps with at least one RE associated with the reception of the PDSCH.

10. The UE according to claim 9, wherein the at least one RE associated with the reception of the PDSCH includes at least one RE included in at least one PRB of at least one symbol, and the at least one symbol is indicated based on time domain resource assignment information in a downlink control information (DCI) format that schedules the PDSCH. The UE of claim 9 , wherein the at least one symbol comprises at least one symbol in which a demodulation reference signal (DMRS) is transmitted.

12. The UE of claim 7, wherein the at least one processor is further configured to bundling the at least one VRB and the at least one PRB based on a higher layer signal, and The bundled at least one VRB is mapped to the bundled at least one PRB.

13. A method performed by a base station in a wireless communication system, the method comprising: mapping at least one virtual resource block (VRB) associated with transmission of a physical downlink shared channel (PDSCH) to at least one physical resource block (PRB); identifying whether the at least one VRB overlaps with an uplink subband; as well as When the at least one VRB is identified as overlapping with the uplink subband, the PDSCH is transmitted in at least one PRB after excluding at least one PRB corresponding to the at least one VRB overlapping with the uplink subband from the mapped at least one PRB.

14. A base station in a wireless communication system, the base station comprising: transceiver; as well as at least one processor connected to the transceiver, wherein the at least one processor is configured to mapping at least one virtual resource block (VRB) associated with transmission of a physical downlink shared channel (PDSCH) to at least one physical resource block (PRB), identifying whether the at least one VRB overlaps with an uplink subband, and When the at least one VRB is identified as overlapping with the uplink subband, the PDSCH is transmitted in at least one PRB after excluding at least one PRB corresponding to the at least one VRB overlapping with the uplink subband from the mapped at least one PRB. 15 . The base station of claim 14 , wherein the at least one processor is further configured to transmit frequency domain resource assignment information for at least one VRB associated with the transmission of the PDSCH to a user equipment (UE).

Images