Method and apparatus for transmitting and receiving data in a wireless communication network

Abstract

A data communication method for a user equipment, comprising: receiving a high-layer signal, the high-layer signal indicating a change in a determination criterion for a starting symbol to which a physical downlink shared channel (PDSCH) is assigned; detecting, in a physical downlink control channel (PDCCH), a downlink control information (DCI) format including PDSCH scheduling information; and determining a starting symbol to which the PDSCH is assigned based on at least one of information about the DCI format, information about a PDSCH mapping type, or an offset value between a time slot in which the PDCCH is located and a time slot in which the PDSCH is located.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving data in a wireless communication network. Background Art

[0002] To meet the demand for wireless data services that have exploded due to the commercialization of the 4th generation (4G) communication system, an improved 5th generation (5G) communication system or pre-5G communication system has been developed. For this reason, the 5G communication system or pre-5G communication system is referred to as a super 4G network communication system or a post-long term evolution (LTE) system. To achieve high data rates, it has been considered to implement the 5G communication system in an extremely high frequency (millimeter wave) band (e.g., 60 gigahertz (GHz) band). To reduce the path loss of radio waves in the extremely high frequency band and increase the transmission distance of radio waves, for the 5G communication system, beamforming, massive multiple input multiple output (MIMO), full-dimension MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technologies have been discussed. In addition, to improve the system network, technologies such as evolved small cells, advanced small cells, cloud radio access network (cloud radio access network (RAN)), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-point (CoMP), receive interference cancellation, etc. have been developed in the 5G communication system. In addition, in the 5G system, hybrid frequency shift keying (FSK) and quadrature amplitude modulation (FQAM) as well as sliding window superposition coding (SWSC) as advanced coding modulation (ACM) methods, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0003] The Internet is a human-centric connectivity network where humans generate and consume information, and is evolving into the Internet of Things (IoT) network that exchanges and processes information between distributed components such as things. The Internet of Everything (IoE) technology that combines big data processing technology with IoT technology through connection with a cloud server, etc. has also emerged. To implement IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. for connection between things have been studied. Such an IoT environment can provide intelligent information technology (IT) services that create new value for human life by collecting and analyzing data generated by connected things. Through the integration and combination of existing information technology (IT) technologies with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, advanced medical services, etc.

[0004] Therefore, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, M2M communication, and MTC are being implemented through 5G communication technologies such as beamforming, MIMO, and array antennas. The application of cloud RAN, which is the above-mentioned big data processing technology, can also be considered an example of the convergence between 5G technology and IoT technology.

[0005] As described above, with the development of wireless communication systems, a method for data transmission and reception in network cooperative communication is required. Summary of the Invention

[0006] [Technical Solution]

[0007] According to an aspect of an exemplary embodiment, a communication method in wireless communication is provided.

[0008] [Beneficial Effects]

[0009] Aspects of the present disclosure provide an effective communication method in a wireless communication system. Brief Description of the Drawings

[0010] To more fully understand the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts:

[0011] Figure 1 Shows the time-frequency domain transmission structure of a Long-Term Evolution (LTE or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-Advanced (LTE-A), New Radio (NR), or similar wireless communication system according to an embodiment of the present disclosure;

[0012] Figure 2 Shows the frame, subframe, and slot structure in the 5th generation (5G) according to an embodiment of the present disclosure;

[0013] Figure 3 Shows the configuration of a bandwidth part (BWP) in a wireless communication system according to an embodiment of the present disclosure;

[0014] Figure 4 Shows the indication and switching of a bandwidth part in a wireless communication system according to an embodiment of the present disclosure;

[0015] Figure 5 Shows the control resource set configuration of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure;

[0016] Figure 6 Shows the frequency domain resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure;

[0017] Figure 7 Shows the time-domain resource allocation of PDSCH in a wireless communication system according to an embodiment of the present disclosure;

[0018] Figure 8 Shows the time-domain resource allocation of PDSCH in a wireless communication system according to the subcarrier spacing of the data channel and the control channel according to an embodiment of the present disclosure;

[0019] Figure 9 Shows the time slot format structure in a wireless communication system according to an embodiment of the present disclosure;

[0020] Figure 10 Shows the repeated transmission (time slot aggregation) of each time slot in a wireless communication system according to an embodiment of the present disclosure;

[0021] Figure 11 Shows the antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure;

[0022] Figure 12 Shows the downlink control information (DCI) configuration for cooperative communication in a wireless communication system according to an embodiment of the present disclosure;

[0023] Figure 13 Shows the repeated transmission of multiple transmission and reception points (TRPs) using various resource allocation methods in a wireless communication system according to an embodiment of the present disclosure;

[0024] Figure 14 Shows the PDSCH repeated transmission method using multiple TRPs in a wireless communication system according to an embodiment of the present disclosure;

[0025] Figure 15 Shows the structure of a user equipment in a wireless communication system according to an embodiment of the present disclosure;

[0026] Figure 16 Shows the structure of a base station in a wireless communication system according to an embodiment of the present disclosure;

[0027] Figure 17 Shows the data transmission method according to an embodiment of the present disclosure; and

[0028] Figure 18 Shows the method using cross-carrier scheduling according to an embodiment of the present disclosure.

[0029] Best Mode

[0030] The disclosed embodiments provide an apparatus and method for effectively providing services in a wireless communication system.

[0031] Other aspects will be provided in part in the following description, and in part will be obvious from the description, or can be learned by practicing the embodiments presented in the disclosure.

[0032] According to one aspect of the present disclosure, a data communication method for a user equipment includes: receiving a high-layer signal indicating a change in a determination criterion of a starting symbol to which a physical downlink shared channel (PDSCH) is assigned; detecting, from a physical downlink control channel (PDCCH), a downlink control information (DCI) format including PDSCH scheduling information; and determining a starting symbol to which the PDSCH is assigned based on at least one of information about the DCI format, information about a PDSCH mapping type, or an offset value between a time slot in which the PDCCH is located and a time slot in which the PDSCH is located.

[0033] According to an embodiment, determining a starting symbol to which the PDSCH is assigned may include: when the PDSCH mapping type is mapping type B, the offset value is 0, and the DCI format is a DCI format including a cyclic redundancy check (CRC) scrambled to one of a cell radio network temporary identifier (C-RNTI), a modulation and coding scheme cell RNTI (MCS-RNTI), and a configured scheduling (CS-RNTI), determining the starting symbol to which the PDSCH is assigned based on a first symbol at a monitoring point where the DCI format is detected in the PDCCH.

[0034] According to an embodiment, determining a starting symbol to which the PDSCH is assigned may include: when the subcarrier spacing of the PDCCH is the same as that of the PDSCH, determining the starting symbol to which the PDSCH is assigned based on a first symbol at a monitoring point where the DCI format is detected in the PDCCH.

[0035] According to an embodiment, determining a starting symbol to which the PDSCH is assigned may include: when the cyclic prefix of the PDCCH is the same as that of the PDSCH, determining the starting symbol to which the PDSCH is assigned based on a first symbol at a monitoring point where the DCI format is detected in the PDCCH.

[0036] According to an embodiment, determining a starting symbol to which the PDSCH is assigned may include: when the PDSCH mapping type is not of type B, the offset value is not 0, and the DCI format is not a DCI format including a CRC scrambled to one of the C-RNTI, MCS-RNTI, and CS-RNTI, determining the starting symbol to which the PDSCH is assigned based on a first symbol in a time slot in which the PDSCH is scheduled.

[0037] According to an embodiment, determining the starting symbol to which the PDSCH is assigned may include: when cross-carrier scheduling of the PDCCH and the PDSCH is configured, determining the starting symbol to which the PDSCH is assigned based on the first symbol in the time slot in which the PDSCH is scheduled.

[0038] According to an embodiment, when a higher layer signal indicating a change in the reference point for determining the starting symbol to which the PDSCH is assigned is not received, determining the starting symbol to which the PDSCH is assigned may include: determining the starting symbol to which the PDSCH is assigned based on the first symbol in the time slot in which the PDSCH is scheduled.

[0039] According to another aspect of the present disclosure, a data communication method for a base station includes: transmitting a higher layer signal that indicates a change in the determination criterion for the starting symbol to which a physical downlink shared channel (PDSCH) is assigned; and providing downlink control information (DCI) format including PDSCH scheduling information through a physical downlink control channel (PDCCH), wherein the starting symbol to which the PDSCH is assigned is determined based on at least one of information about the DCI format, information about the PDSCH mapping type, or an offset value between the time slot in which the PDCCH is located and the time slot in which the PDSCH is located.

[0040] According to an embodiment, when the PDSCH mapping type is mapping type B, the offset value is 0, and the DCI format is a DCI format including a cyclic redundancy check (CRC) scrambled to one of a radio network temporary identifier (C-RNTI), an MCS-RNTI, and a CS-RNTI, and the subcarrier spacing of the PDCCH and the PDSCH is the same, the starting symbol to which the PDSCH is assigned may be determined based on the first symbol at the monitoring point where the DCI format is detected in the PDCCH.

[0041] According to an embodiment, when cross-carrier scheduling of the PDCCH and the PDSCH is configured or the subcarrier spacings of the PDCCH and the PDSCH are different from each other, the starting symbol to which the PDSCH is assigned may be determined based on the first symbol in the time slot in which the PDSCH is scheduled.

[0042] Before proceeding with the following detailed implementation, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document: The term "comprising" and its derivatives mean including but not limited to; the term "or" is inclusive and means and / or; the phrases "associated with" and "associated therewith" and their derivatives may mean including, included within, interconnected with, including, included within, connected to or connected with, coupled to or coupled with, capable of communicating with, cooperating with, interleaved, juxtaposed, adjacent to, bound to or bound with, having, having the property of, etc.; and the term "controller" means any device, system or part thereof that controls at least one operation, and the device may be implemented in hardware, firmware or software or a certain combination of at least two of them. It should be noted that the functions associated with any particular controller, whether local or remote, may be centralized or distributed.

[0043] In addition, the various functions described below can be implemented or supported by one or more computer programs, each computer program being formed of computer-readable program code and embodied in a computer-readable medium. The terms "application program" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a part thereof that are adapted to be implemented with appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, optical disc (CD), digital video disc (DVD) or any other type of memory. A "non-transitory" computer-readable medium excludes wired, wireless, optical or other communication links that transmit transient electrical signals or other transient signals. Non-transitory computer-readable media include media that can permanently store data, as well as media that can store data and then rewrite the data, such as rewritable optical discs or erasable memory devices.

[0044] Throughout this patent document, definitions of certain words and phrases are provided, and those of ordinary skill in the art should understand that in many instances, if not most instances, such definitions apply to the previous and future uses of the words and phrases so defined.

[0045] As discussed below Figures 1 to 18 and the various embodiments used in this patent document to describe the principles of the present disclosure are merely for illustrative purposes and should not be construed in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0046] Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0047] In the following description, technical content that is well-known in the art to which the present disclosure pertains and is not directly relevant to the present disclosure may unnecessarily obscure the subject matter of the present disclosure, and its description will be omitted. This is to prevent unnecessary description from obscuring the subject matter of the present disclosure and to further clearly describe the gist of the present disclosure.

[0048] For the same reason, each element shown in the drawings may be enlarged, omitted, or shown schematically. In addition, the size of each element shown does not substantially reflect its actual size. In each drawing, the same reference numerals denote the same or corresponding elements.

[0049] Advantages and features of the present disclosure and methods for achieving the advantages and features can be more easily understood by referring to the following detailed description of exemplary embodiments and the drawings. However, the present disclosure may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and the concept of the present disclosure will be fully conveyed to those skilled in the art, and the present disclosure will be defined only by the appended claims. Throughout the specification, the same reference numerals refer to the same elements.

[0050] Throughout the present disclosure, the expression "at least one of a, b, or c" indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0051] Examples of user equipment (UE) may include UE, mobile station (MS), cellular phone, smart phone, computer, multimedia system capable of performing communication functions, and the like.

[0052] In the present disclosure, the controller may also be referred to as a processor.

[0053] Throughout the specification, a layer (or layer device) may also be referred to as an entity.

[0054] It will be understood that the blocks in the flowcharts and combinations of flowcharts can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or another programmable data processing apparatus, the instructions executed by the processor of the computer or another programmable data processing apparatus produce means for performing the functions described in one or more of the flowchart blocks. The computer program instructions can be stored in a computer-usable or computer-readable memory, which can direct the computer or another programmable data processing apparatus to implement the functions in a specific manner, so the instructions stored in the computer-usable or computer-readable memory can also produce an article of manufacture that includes means for performing the functions described in one or more of the flowchart blocks. The computer program instructions, and thus the instructions for operating the computer or another programmable data processing apparatus by generating a process executed by the computer when a series of operations are performed in the computer, can also be loaded into the computer or another programmable data processing apparatus, or other programmable data processing apparatus can provide operations for performing the functions described in one or more of the flowchart blocks.

[0055] In addition, each block can represent a module, segment, or portion of code that includes one or more executable instructions for performing the specified logical function. It should also be noted that in some alternative embodiments, the functions recited in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially concurrently, or sometimes may be executed in the reverse order depending on the corresponding functions.

[0056] As used herein, the term "means" refers to a software component or a hardware component, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and performs a certain function. However, the term "means" is not limited to software or hardware. A "means" can be formed to be in an addressable storage medium or can be formed to operate on one or more processors. Thus, for example, the term "means" can refer to components such as software components, object-oriented software components, class components, and task components, and can include processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, or variables. The functions provided by the components and "means" can be associated with fewer components and "means", or can be divided into additional components and "means". In addition, the components and "means" can be implemented to reproduce one or more central processing units (CPUs) in a device or a secure multimedia card. As used herein, a "means" can include at least one processor.

[0057] In the following, the operation principle of the present disclosure is described with the following accompanying drawings. In addition, in the following description, when it is determined that a detailed description of a well-known function or structure in the art will obscure the gist of the present disclosure, such detailed description will be omitted herein. Considering the functions of the present disclosure, the terms used in the present disclosure are selected from commonly used general terms currently in wide use. However, these terms may vary according to the intention of those of ordinary skill in the art, precedents, and the emergence of new technologies. Therefore, the terms used in the present disclosure are defined based on their meanings with respect to the content discussed throughout the specification, rather than by their simple meanings. In the following, the base station is the entity that performs UE resource allocation and may be at least one of a gNode B, an eNodeB, a Node B, a base station (BS), a radio access unit, a base station controller, or a network node. The UE may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing communication functions, and the like. However, the present disclosure is not limited to the above examples.

[0058] In the following, the present disclosure describes a technique for a UE to receive broadcast information from a base station in a wireless communication system. The present disclosure relates to a communication technique and system for supporting the convergence of a 5G communication system with a higher data transmission rate than a 4G system and IoT technology. The present disclosure may be applied to intelligent services based on 5G communication technology and IoT-related technologies (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety services, etc.).

[0059] In the following, for ease of description, terms related to broadcast information, terms related to control information, terms related to communication coverage, terms related to state changes (e.g., events), terms related to network entities, terms related to messages, terms related to device components, etc., used in the description are presented. Therefore, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

[0060] In the following, for ease of explanation, terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard may be used. However, the present disclosure is not limited to these terms and names and may equally apply to systems compliant with other standards.

[0061] Wireless communication systems that provide voice-based services are evolving into broadband wireless communication systems that offer high-speed and high-quality packet data services according to communication standards such as High-Speed Packet Access (HSPA), Long-Term Evolution (LTE), or Evolved Universal Terrestrial Radio Access (E-UTRA), as well as Advanced LTE (LTE-A) of 3GPP, High Rate Packet Data (HRPD) and Ultra Mobile Broadband (UMB) of 3GPP2, and communication standards of the Institute of Electrical and Electronics Engineers (IEEE) 802.16e.

[0062] As a representative example of a broadband wireless communication system, the LTE system adopts an Orthogonal Frequency Division Multiplexing (OFDM) scheme on the Downlink (DL) and a Single-Carrier Frequency Division Multiple Access (SC-FDMA) on the Uplink (UL). UL refers to the radio link for transmitting data or control signals from a terminal, UE, or MS to an eNodeB or BS, and DL refers to the radio link for transmitting data or control signals from a BS to a UE. The above dual-connection scheme differentiates the data or control information of different users by allocating and using time-frequency resources that do not overlap with each other, i.e., achieving orthogonality between them.

[0063] As a future communication system after LTE, the 5G communication system supports services that meet various requirements because various requirements regarding users and service providers are freely reflected. Services considered in the 5G communication system include Enhanced Mobile Broadband (eMBB) communication, Massive Machine-Type Communication (mMTC), Ultra-Reliable Low-Latency Communication (URLLC) communication, etc.

[0064] According to an embodiment, eMBB aims to provide a higher data transmission rate than that supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, from the perspective of a single base station, eMBB can provide a peak data rate of 20 Gbps in the DL and 10 Gbps in the UL. At the same time, the perceived data rate of actual users of enhanced UEs is provided. To meet the demand, it is necessary to improve transmission and reception technologies, including more enhanced Multiple-Input Multiple-Output (MIMO) transmission technologies. In addition, the data transmission rate required by the 5G communication system can be met by using a frequency bandwidth wider than 20 MHz in the frequency band of 3 GHz to 6 GHz or 6 GHz or higher, rather than the 2 GHz frequency band used by the current LTE system.

[0065] Meanwhile, in a 5G communication system, mMTC is considered to support application services such as IoT. To effectively provide IoT, mMTC may require large-scale UE access support within a cell, improved UE coverage, improved battery usage time, and reduced UE cost. IoT is attached to various sensors and various devices to provide communication functions, so IoT may be able to support a large number of UEs within a cell, such as 1,000,000 UEs / km 2 . In addition, UEs supporting mMTC are likely to be located in shadow areas not covered by the cell (such as the basement of a building) due to their service characteristics, so they may require a wider coverage area compared to other services provided in the 5G communication system. UEs supporting mMTC are configured as low-cost UEs and may require an extremely long battery life because it is difficult to replace the UE's battery frequently.

[0066] Finally, for URLLC, which is a cellular-based wireless communication service for specific purposes (mission-critical) or for services such as remote control of robots or mechanical devices, industrial automation, and drones, remote healthcare, emergency alerts, etc., communication with ultra-low latency and ultra-high reliability is provided. For example, services supporting URLLC satisfy a wireless connection latency time (air interface latency) of less than 1 millisecond, and also require a -5 packet error rate of 10 or less. Therefore, for services supporting URLLC, the 5G system provides a smaller transmission time interval (TTI) than other services, and at the same time, a design requirement for allocating wide resources in the frequency band is also needed. However, the above mMTC, URLLC, and eMBB are only examples of different service types, and the service types involved in the present disclosure are not limited to the above examples.

[0067] In the above 5G communication system, the considered services can be provided by being fused with each other based on one framework. In other words, for effective resource management and control, services can be controlled and transmitted by being integrated in one system without separate operations.

[0068] In addition, the LTE, LTE-A, LTE Pro, or New Radio (NR) system will be described below as an example of the embodiments of the present disclosure, but the embodiments of the present disclosure can be applied to other communication systems with a similar technical background or channel form. In addition, the embodiments of the present disclosure can be applied to other communication systems with some modifications within the scope of the present disclosure by those skilled in the art who are familiar with the technical knowledge in this field.

[0069] The present disclosure relates to a method and apparatus for repeatedly transmitting data and control signals between multiple transmission nodes and a UE that perform cooperative communication to enhance communication reliability.

[0070] According to the present disclosure, when network cooperative communication is used in a wireless communication system, the reliability of data / control signal reception by a UE can be improved.

[0071] Hereinafter, the framework structure of a 5G system is described in detail with reference to the accompanying drawings.

[0072] Figure 1 The basic structure in the time-frequency domain according to an embodiment of the present disclosure is shown, which is a wireless resource region for transmitting data or a control channel in a 5G system.

[0073] Reference Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In the time-frequency domain, the basic unit of a resource is a resource element (RE, 1-01), which can be defined as 1 OFDM symbol 1-02 on the time axis and 1 subcarrier 1-03 on the frequency axis. In the frequency domain, N_sc RB (e.g., 12) consecutive REs can constitute a resource block (RB) 1-04.

[0074] Figure 2 The frame, subframe, and slot structures in a 5G system according to an embodiment of the present disclosure are shown.

[0075] Reference Figure 2 , an example of the frame 2-00, subframe 2-01, and slot 2-02 structures is shown. 1 frame 2-00 can be defined as 10 milliseconds (ms). 1 subframe 2-01 can be defined as 1 ms, and thus, 1 frame 2-00 can include a total of 10 subframes 2-01. 1 slot 2-02 or 2-03 can be defined as 14 OFDM symbols (i.e., the number of symbols per 1 slot 1 subframe 2-01 can include one or more slots 2-02 or 2-03, and the number of slots 2-02 or 2-03 in each subframe 2-01 can vary according to the configured value μ 2-04 or 2-05 for the subcarrier spacing. In Figure 2 's example, the cases where the subcarrier spacing configured values are μ = 0 (2-04) and μ = 1 (2-05) are shown. When μ = 0 (2-04), 1 subframe 2-01 can include one slot 2-02; and when μ = 1 (2-05), 1 subframe 2-01 can include two slots 2-03. In other words, the number of slots per 1 subframe can vary according to the configured value μ for the subcarrier spacing, and the number of slots per 1 frame can vary according to it. According to the and of the configured value μ for each subcarrier spacing can be defined as shown in Table 1 below.

[0076] [Table 1]

[0077]

[0078] In the NR system, a component carrier (CC) or serving cell may include up to 250 or more resource blocks (RBs). Thus, as in LTE, when the UE always receives the entire serving cell bandwidth, the power consumption of the UE may be quite high. To address this issue, the base station configures one or more bandwidth parts (BWPs) for the UE to support the UE in changing the reception area in the cell. In the NR system, the base station may configure an "initial BWP" for the UE through the master information block (MIB), i.e., the bandwidth of CORESET#0 or the common search space (CSS). Then, the base station configures the first BWP of the UE through radio resource control (RRC) signaling and may provide at least one BWP configuration information that can be indicated by downlink control information (DCI) in the future. Then, the base station issues a BWP ID through DCI to indicate which frequency band the UE should use. If the UE does not receive DCI in the currently allocated BWP within a specific time period, the UE may attempt to receive DCI by returning to the "default BWP". According to an embodiment, the "default BWP" may be the same as or different from the "initial BWP".

[0079] Figure 3 FIG. shows the BWP configuration in a wireless communication system according to an embodiment of the present disclosure.

[0080] Reference Figure 3 , shows an example in which the UE bandwidth 3-00 is configured to include two BWPs (i.e., bandwidth part #1 3-05 and bandwidth part #2 3-10). The base station may configure one or more BWPs for the UE and configure a plurality of information as shown in Table 2 for each BWP.

[0081] [Table 2]

[0082]

[0083] The present disclosure is not limited to the above examples, and various parameters related to the BWP may be configured in the UE in addition to the configuration information described in Table 2. The above-mentioned plurality of information may be sent by the base station to the UE through higher layer signaling (e.g., RRC signaling). At least one of the configured one or more BWPs may be activated. Whether to activate the configured BWP may be sent semi-statically from the base station to the UE through RRC signaling, or dynamically sent through a media access control (MAC) control element (CE) or DCI.

[0084] In the 5G communication system, the supported BWP configuration can be used for various purposes.

[0085] According to an embodiment, when the bandwidth supported by the UE is less than the system bandwidth, only the bandwidth supported by the UE can be configured through BWP configuration. For example, in Table 2, since the frequency position of the BWP is configured in the UE, the UE can transmit and receive data at a specific frequency position within the system bandwidth.

[0086] In addition, according to an embodiment, in order to support different parameter sets, the base station can configure multiple BWPs for the UE. For example, in order to support the UE to transmit and receive all data using subcarrier spacings of 15 kHz and 30 kHz, two BWPs can be configured by using subcarrier spacings of 15 kHz and 30 kHz respectively. Different BWPs can be frequency-division multiplexed (FDM), and when data is about to overflow at a specific subcarrier spacing, the BWP configured for that subcarrier spacing can be activated.

[0087] In addition, according to an embodiment, in order to reduce the power consumption of the UE, the base station can configure BWPs with different bandwidth sizes for the UE. For example, when the UE supports a very large bandwidth (e.g., a bandwidth of 100 MHz) and always transmits and receives data at that bandwidth, very large power consumption may occur. In particular, for the UE, performing unnecessary DL control channel monitoring for a large bandwidth of 100 MHz in the absence of traffic is extremely inefficient in terms of power consumption. Therefore, in order to reduce the power consumption of the UE, the base station can configure a BWP with a relatively small bandwidth (e.g., 20 megahertz (MHz)) for the UE. In the absence of traffic, the UE can perform monitoring operations with a 20-MHz BWP; and when data is generated, the UE can transmit and receive data by using a 100-MHz BWP according to the instructions of the base station.

[0088] Figure 4 Indicates the indication and switching of BWPs in a wireless communication system according to an embodiment of the present disclosure.

[0089] Refer to Figure 4 , as described in Table 2 above, the base station can configure one or more BWPs for the UE, and as the configuration of each BWP, information about the bandwidth of the BWP, the frequency position of the BWP, or the parameter set of the BWP can be notified to the UE. Figure 4 Shows an example of configuring two BWPs (i.e., BWP#1 4-05 and BWP#2 4-10) in the UE bandwidth 4-00 in one UE. Among the configured bandwidths, one or more BWPs can be activated, and in Figure 4 an example of activating one BWP can be considered. In Figure 4In [description], in time slots #0 4-25, BWP#14-05 in the configured BWP is activated, and the UE can monitor the physical downlink control channel (PDCCH) in control resource set (CORESET)#1 4-45 configured in BWP#1 4-05, and send and receive data 4-55 in BWP#14-05. The control resource set for the UE to receive the PDCCH can change according to which BWP in the configured BWP is activated. Therefore, the bandwidth for the UE to monitor the PDCCH can vary.

[0090] The base station can also send an indicator for switching the BWP configuration to the UE. Switching the BWP configuration can be considered the same operation as activating a specific BWP. For example, activating a switch from BWP A to BWP B. The base station can send a configuration switch indicator to the UE in a specific time slot. The UE can receive the configuration switch indicator from the base station, and then determine the BWP to be activated by applying the switched configuration according to the configuration switch indicator from a specific time point, and monitor the PDCCH in the control resource set configured for the activated BWP.

[0091] In Figure 4 [description], the base station can send a configuration switch indicator 4-15 to the UE in time slot #14-30, which indicates that the activated BWP switches from the existing BWP#14-05 to BWP#24-10. After receiving the configuration switch indicator, the UE can activate BWP#24-10 according to the content of the indicator. At this time, a transition time 4-20 for switching the BWP may be required, so the time point for switching the BWP to be activated and applied can be determined. In Figure 4 [description], a situation where the transition time 4-20 of 1 time slot is consumed after receiving the configuration switch indicator 4-15 is shown. Data transmission and reception may not be performed during the transition time 4-20 (4-60). Therefore, BWP#24-10 is activated in time slot #24-35, and operations of sending and receiving control channels and data using the BWP can be performed.

[0092] The base station can pre-configure one or more BWPs for the UE through higher layer signaling (e.g., RRC signaling), and can indicate activation in a method of mapping the configuration switch indicator 4-15 to one of the BWP configurations pre-configured by the base station. For example, an indicator of [log2N] bits can indicate by selecting one of the previously configured N BWPs. Table 3 below describes an example of indicating configuration information about the BWP by using a 2-bit indicator.

[0093] [Table 3]

[0094] Indicator value BWP configuration 00 BWP configuration A configured by higher layer signaling A 01 BWP configuration B configured by higher layer signaling B 10 BWP configuration C configured by higher layer signaling C 11 BWP configuration D configured by higher layer signaling D

[0095] Regarding Figure 4 The BWP configuration switching indicator 4-15 described in Figure 4 can be sent from the base station to the UE in the form of MAC CE signaling or L1 signaling such as common DCI, group-common DCI, or UE-dedicated DCI. This disclosure is not limited to the above examples.

[0096] According to Figure 4 the BWP configuration switching indicator 4-15 described in Figure 4 , at which time point the BWP activation is applied can be described as follows. The time point for applying the configuration switch can be determined by the following methods: by a predefined value (e.g., N (≥1) time slots after receiving the configuration switching indicator), configured by the base station to the UE through higher layer signaling (e.g., RRC signaling), by being partially included in the content of the configuration switching indicator 4-15 and being sent, or by a combination of the above methods. After receiving the BWP configuration switching indicator 4-15, the UE can apply the switched configuration starting from the time point obtained by the above methods.

[0097] In the following description, the DL control channel of the 5G communication system is described in detail with reference to the accompanying drawings.

[0098] Figure 5 Shows the control resource set configuration of the DL control channel in a wireless communication system according to an embodiment of the present disclosure.

[0099] Refer to Figure 5 , shows an example of configuring the UE's BWP 5-10 on the frequency axis and configuring two control resource sets (i.e., control resource set #1 5-01 and control resource set #2 5-02) in one time slot 5-20 on the time axis. The control resource sets 5-01 and 5-02 can be configured on the frequency axis in a specific frequency resource 5-03 within all UE BWPs 5-10. On the time axis, the control resource sets 5-01 and 5-02 can be configured as one or more OFDM symbols and are defined as the duration 5-04 of the control resource set. In Figure 5 the example of Figure 5 , the control resource set #1 5-01 is configured as the duration of a control resource set of two symbols, and the control resource set #2 5-02 is configured as the duration of a control resource set of one symbol.

[0100] The above control resources set in the 5G system can be configured by the base station to the UE through higher layer signaling such as system information, MIB, or RRC signaling. Configuring a control resource set for the UE can be to provide the UE with information such as the control resource set identifier, the frequency location of the control resource set, the symbol length of the control resource set, etc. For example, it can include the information in Table 4.

[0101] [Table 4]

[0102]

[0103] In Table 4, the tci-States PDCCH (abbreviated as Transmission Configuration Indicator (TCI) state) configuration information may include information of one or more Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block indexes or Channel State Information Reference Signal (CSI-RS) indexes, where the Channel State Information Reference Signal has a Quasi-Co-Location (QCL) relationship with the Demodulation Reference Signal (DMRS) transmitted in the control resource set.

[0104] Next, the DCI in the NR system is described in detail. In the NR system, the scheduling information regarding UL data or Physical Uplink Shared Channel (PUSCH) or downlink data or Physical Downlink Shared Channel (PDSCH) is sent from the base station to the UE via DCI. To effectively receive the control channel of the UE, various forms of DCI formats according to the purpose are provided as shown in Table 5 below.

[0105] [Table 5]

[0106]

[0107] The UE can monitor the DCI formats for fallback and non-fallback regarding the PUSCH or PDSCH. The DCI format for fallback may consist of fixed fields predefined between the base station and the UE, and the DCI format for non-fallback may include configurable fields.

[0108] The DCI can be sent via the PDCCH, which is a Physical Downlink Control Channel, through the channel coding and modulation process. A Cyclic Redundancy Check (CRC) is appended to the DCI message payload, and the CRC is scrambled into the Radio Network Temporary Identifier (RNTI) corresponding to the UE identity. Different RNTIs are used according to the target of the DCI message (e.g., UE-specific data transmission, power control command, or random access response). In other words, the RNTI is not explicitly sent but is sent by being included in the CRC calculation process. When receiving the DCI message sent on the PDCCH, the UE can check the CRC using the assigned RNTI, and when the CRC check result is correct, it can know that the message is sent to the UE.

[0109] For example, the DCI for scheduling PDSCH for system information (SI) can be scrambled to SI-RNTI. The DCI for scheduling PDSCH for random access response (RAR) message can be scrambled to RA-RNTI. The DCI for scheduling PDSCH for paging message can be scrambled to P-RNTI. The DCI for providing slot format indicator (SFI) can be scrambled to SFI-RNTI. The DCI for providing transmit power control (TPC) can be scrambled to TPC-RNTI. The DCI for providing interruption (INT) of the downlink data channel can be scrambled to INT-RNTI.

[0110] The DCI for scheduling UE-specific PDSCH or PUSCH can be scrambled to cell RNTI (C-RNTI).

[0111] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled to C-RNTI. The DCI format 0_0 with CRC scrambled to C-RNTI can include multiple pieces of information such as those in Table 6 below.

[0112] [Table 6]

[0113]

[0114] DCI format 1_0 can be used as a non-fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled to C-RNTI. The DCI format 0_1 with CRC scrambled to C-RNTI can include multiple pieces of information such as those in Table 7 below.

[0115] [Table 7]

[0116]

[0117] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled to C-RNTI. The DCI format 1_0 with CRC scrambled to C-RNTI can include multiple pieces of information such as those in Table 8 below.

[0118] [Table 8]

[0119]

[0120] DCI format 1_1 can be used as a non-fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled to C-RNTI. The DCI format 1_1 with CRC scrambled to C-RNTI can include multiple pieces of information such as those in Table 9 below.

[0121] [Table 9]

[0122]

[0123] In the NR system, in addition to the candidate frequency-domain resource allocation indicated by the BWP, detailed frequency-domain resource allocation (FDRA) can also be provided by DCI as follows.

[0124] Figure 6 The PDSCH frequency-domain resource allocation in a wireless communication system according to an embodiment of the present disclosure is shown.

[0125] Reference Figure 6 , when the UE is configured to use only resource type 0 by higher-layer signaling (6-00), some DCI for allocating PDSCH to the UE may have a bitmap composed of N RBG bits. The conditions for the above features will be described later. In this state, N RBG may refer to the number of resource block groups (RBGs) determined according to the higher-layer parameter rbg-Size and the size of the BWP allocated by the indicator as shown in Table 10 below, and data is sent to the RBGs with the bitmap shown as 1.

[0126] [Table 10]

[0127] Bandwidth part size Configuration 1 Configuration 2 1-36 2 4 37-72 4 8 73-144 8 16 145-275 16 16

[0128] When the UE is configured to use only resource type 1 by higher-layer signaling (6-05), some DCI for allocating PDSCH to the UE may have frequency-domain resource allocation information composed of bits. The base station can configure the starting VRB 6-20 and the length 6-25 of the continuously allocated frequency-domain resources through the above information.

[0129] When the UE is configured to use both resource type 0 and resource type 1 by higher-layer signaling (6-10), some DCI for allocating PDSCH to the UE may have frequency-domain resource allocation information, which is composed of bits of the larger value 6-35 between the payload 6-15 for configuring resource type 0 and the payloads 6-20 and 6-25 for configuring resource type 1. The conditions for the above features will be described later. In this state, a bit can be added at the forefront (MSB) of the frequency-domain resource allocation information in the DCI; and when this bit is 0, it can indicate the use of resource type 0; when this bit is 1, it can indicate the use of resource type 1.

[0130] Figure 7 The PDSCH time-domain resource allocation in a wireless communication system according to an embodiment of the present disclosure is shown.

[0131] Reference Figure 7, the base station can indicate the time-axis position of the PDSCH resource according to the subcarrier spacing μ of the data channel and the control channel configured through the higher layer PDSCH and μ PDCCH , the scheduling offset K0 value, and the starting position position7-00 and length 7-05 of the OFDM symbol in one time slot 7-10 dynamically indicated by the DCI.

[0132] Figure 8 FIG. shows the PDSCH time-domain resource allocation according to the subcarrier spacing of the data channel and the control channel in a wireless communication system according to an embodiment of the present disclosure.

[0133] Reference Figure 8 , when the subcarrier spacings of the data channel and the control channel are the same (8-00, μ PDSCH = μ PDCCH ), since the number of time slots for data and control is the same, the base station and the UE can know that the scheduling offset is generated according to a predetermined time slot offset K0. On the contrary, when the subcarrier spacings of the data channel and the control channel are different from each other (8-05, μ PDSCH ≠μ PDCCH ), since the number of time slots for data and control is different from each other, the base station and the UE can know that the scheduling offset is generated according to a predetermined time slot offset K0 based on the subcarrier spacing of the PDCCH.

[0134] Next, in the NR system, the partial decoding process of the PDSCH scheduled by the DCI is described in detail.

[0135] The UE receives the modulation and coding scheme (MCS) of the PDSCH with the frequency and time resource information to which the PDSCH is assigned through the DCI. The MCS field of the DCI indicates the index of one table selected from the following three tables (i.e., Table 11, Table 12, and Table 13) through the higher layer. During the initial transmission and the HARQ retransmission process, the range of the indicated index can be different, and during the initial transmission process, the indices 0 to 28 of Table 11, the indices 0 to 27 of Table 12, and the indices 0 to 28 of Table 13 are used, and during the retransmission process, the indices 29 to 31 of Table 11, the indices 28 to 31 of Table 12, and the indices 29 to 31 of Table 13 are used. During the initial transmission process, the indicated index can include the modulation order and target code rate information of the transmitted PDSCH; and during the retransmission process, the indicated index can include the modulation order information of the transmitted PDSCH.

[0136] [Table 11]

[0137]

[0138] MCS Index Table 1 for PDSCH

[0139] [Table 12]

[0140]

[0141] MCS Index Table 2 for PDSCH

[0142] [Table 13]

[0143]

[0144] MCS Index Table 3 for PDSCH

[0145] For the initial transmission, the UE needs to know the size of the transport block (TB) before encoding the scheduled PDSCH. To this end, the following steps are performed, and when two TBs are sent, the following steps are performed for each codeword.

[0146] - Step 1) The UE calculates the total number of REs to which the PDSCH transmission is allocated in one of the time slots and physical resource blocks (PRBs) in which the PDSCH is scheduled, using the equation In the equation for calculating the total number of REs to which the PDSCH transmission is allocated, represents 12, i.e., the number of subcarriers in one PRB, and represents the number of symbols scheduled for the PDSCH in one time slot. In addition, represents the number of REs to which the DM-RS is allocated in the PRB, including the overhead indicated in the DM-RS CDM group without data in the DCI. In addition, represents the overhead value indicated by the higher layer. Next, the total number of REs in the entire scheduled PRB is calculated using the equation N RE = min(156, N′ RE )·n PRB In the equation for calculating the total number of REs in the entire scheduled PRB, nPRB represents the total number of PRBs to which the UE's PDSCH transmission is allocated.

[0147] - Step 2) The number of intermediate information bits in the PDSCH is calculated using the equation N info = N RE ·R·Q m υ, where R and Q m represent the target rate and modulation order indicated by the MCS, respectively, and v represents the number of layers.

[0148] - Step 3) When the calculated value of N info is greater than 3824, the UE determines that multiple code blocks can be transmitted (Step 5); otherwise, the UE determines that a single code block is to be sent (Step 4).

[0149] - Step 4) When the UE determines that a single code block is to be sent, the UE calculates the equation Among them And find in Table 14 the minimum transport block size (TBS) not less than N'. info The TBS found by the UE is the TB size determined by the UE.

[0150] - Step 5) When the UE determines that multiple code blocks can be transmitted, the UE performs the next step according to the equation and the target code rate, where

[0151] - Step 5-1) When the target code rate ≤ 1 / 4 and where and the calculated TBS represents the number of code blocks.

[0152] - Step 5-2) When the target code rate > 1 / 4 and N' info > 8424, where and the calculated TBS represents the number of code blocks. In the opposite case, and a single code block is sent.

[0153] [Table 14]

[0154] Index TBS Index TBS Index TBS Index TBS 1 24 31 336 61 1288 91 3624 2 32 32 352 62 1320 92 3752 3 40 33 368 63 1352 93 3824 4 48 34 384 64 1416 5 56 35 408 65 1480 6 64 36 432 66 1544 7 72 37 456 67 1608 8 80 38 480 68 1672 9 88 39 504 69 1736 10 96 40 528 70 1800 11 104 41 552 71 1864 12 112 42 576 72 1928 13 120 43 608 73 2024 14 128 44 640 74 2088 15 136 45 672 75 2152 16 144 46 704 76 2216 17 152 47 736 77 2280 18 160 48 768 78 2408 19 168 49 808 79 2472 20 176 50 848 80 2536 21 184 51 888 81 2600 22 192 52 928 82 2664 23 208 53 984 83 2728 24 224 54 1032 84 2792 25 240 55 1064 85 2856 26 256 56 1128 86 2976 27 272 57 1160 87 3104 28 288 58 1192 88 3240 29 304 59 1224 89 3368 30 320 60 1256 90 3496

[0155] In the case of retransmission, it is assumed that the TB size of the retransmitted PDSCH is the same as the TB size calculated during the initial transmission process.

[0156] Figure 9 Shows the slot format structure in a wireless communication system according to an embodiment of the present disclosure.

[0157] The Rel-15 NR system provides a frequency division duplex (FDD) system that uses DL frequency and UL frequency separately and a time division duplex (TDD) system that uses DL frequency and UL frequency together. In the case of TDD, the UE must know in advance whether a specific time slot or symbol is a DL symbol or a UL symbol to communicate with the base station. Therefore, in the NR system, the following three types of symbol types are provided.

[0158] - DL symbol

[0159] - UL symbol

[0160] - Flexible symbol: A symbol that can be used as a DL symbol or a UL symbol

[0161] The UE can finally determine whether the symbol is a DL symbol, a UL symbol, or a flexible symbol through the following four steps.

[0162] - Step 1: Common RRC signaling

[0163] The System Information Block (SIB) generally notifies the UE of the symbol configuration in the time slots within each specific time slot period. The SIB notifies the number of DL time slots, the number of DL symbols, the number of UL time slots, and the number of UL symbols present in a specific period. Time slots or symbols that are not indicated as UL time slots or UL symbols or DL time slots or DL symbols are considered flexible time slots or flexible symbols. In the NR system, tdd-UL-DL-ConfigurationCommon is considered the signaling in step 1.

[0164] - Step 2: UE-specific RRC signaling

[0165] In step 1, information on UL symbols or DL symbols for flexible time slots or flexible symbols is also provided. For the flexible time slots or flexible symbols determined in step 1, also in step 2, time slots or symbols without UL or DL information are considered flexible time slots or flexible symbols by the UE. According to the UE, step 2 can be omitted. In other words, the DL symbols or UL symbols determined in step 1 may not be changed again by step 2. In the NR system, tdd-UL-DL-ConfigurationDedicated is considered the signaling in step 2.

[0166] - Step 3: Common L1 signaling

[0167] Only for the flexible symbols determined in step 1 or step 2, the UL symbols, DL symbols, or flexible symbols are again indicated by DCI format 2_0. According to the UE, step 3 can be omitted. In other words, the DL symbols or UL symbols determined in step 1 or step 2 may not be changed again by step 3. In the NR system, DCI format 2_0 is considered the signaling in step 3.

[0168] - Step 4: UE-specific L1 signaling

[0169] For the flexible symbols or UL symbols determined in step 1, step 2, or step 3, the UL symbols are determined by DCI format 0_x used for scheduling UL data. Alternatively, for the flexible symbols or DL symbols determined in step 1, step 2, or step 3, the DL symbols are determined by DCI format 1_x used for scheduling DL data. In other words, for the DL symbols determined in step 1, step 2, or step 3, the UE does not expect UL data transmission to be scheduled by DCI format 0_x. In the NR system, DCI format 1_x or DCI format 0_x is considered the signaling for step 4.

[0170] According to an embodiment of the present disclosure, in the above steps, step 3 or step 4 can be applied in the reverse order. Therefore, the UE does not expect the UL symbol indicated in step 4 to be indicated again as a flexible symbol or a DL symbol in step 3. In addition, the UE does not expect the DL symbol indicated in step 4 to be indicated again as a flexible symbol or a UL symbol in step 3. Therefore, the symbol first indicated in step 4 is indicated as exactly the same symbol in step 3. The case of applying steps 1 to 3 is shown as an example in Figure 9 As shown in 9-10, the DL symbol 9-02, the flexible symbol 9-04, and the UL symbol 9-06 can be configured in one time slot in step 1 or step 2 as high-level signaling. Then, the UE can dynamically indicate the UL symbol 9-12 and the DL symbol 9-14 in step 3 only on the flexible symbol link configured in step 1 or step 2, as shown in 9-10.

[0171] The next operation is established for the PDSCH scheduled by DCI format 1_0 or 1_1 or the first SPS PDSCH scheduled by DCI format 1_0 or 1_1 indicating SPS activation in the Rel-15 NR system.

[0172] - When scheduling the PDSCH in a single time slot in any case where the common L1 signaling in step 3 is configured or not configured as high-level signaling, the UE does not expect it to overlap with the UL symbol configured in step 1 or step 2. In other words, there is no resource indicated as a UL symbol through step 1 or step 2 in the time resource domain where the PDSCH is scheduled.

[0173] - When repeating the transmission of the PDSCH in a time slot period in any case where the common L1 signaling in step 3 is configured or not configured as high-level signaling, when the UL symbol configured by step 1 or step 2 overlaps with the PDSCH transmitted in a specific time slot, the UE does not expect to receive the PDSCH in that time slot. In other words, the reception of the PDSCH is omitted.

[0174] - When the common L1 signaling in step 3 is configured, the UE does not expect the partial time resource domain where the PDSCH is scheduled to be configured as a UL symbol through step 3. In other words, the UE expects the PDSCH to be scheduled to the time resource domain configured with other symbols (rather than the UL symbol in step 3).

[0175] - When the common L1 signaling in step 3 is configured, the UE does not expect the partial time resource domain of the first SPS PDSCH first transmitted by the activation DCI indicating the SPS PDSCH to be configured as a UL or flexible link through step 3. In other words, the UE expects the first SPS PDSCH to be scheduled only to the time resource domain configured as DL through step 3.

[0176] The next operation is established for other SPS PDSCHs except for the first SPS PDSCH scheduled by DCI format 1_0 or 1_1 indicating SPS activation in the Rel-15 NR system.

[0177] - When the common L1 signaling in step 3 is not configured and a partial resource domain of the SPS PDSCH that is repeatedly transmitted and received within a time slot period is configured as a UL symbol through step 1 or step 2, the UE does not expect to receive the SPS PDSCH, and the base station does not transmit the SPS PDSCH.

[0178] - When the common L1 signaling in step 3 is configured, the UE correctly receives the common L1 signaling in step 3, and a partial resource domain of the SPS PDSCH that is repeatedly transmitted and received within a time slot period overlaps with the UL symbol or flexible symbol indicated by the common L1 signaling, the UE does not expect to receive the SPS PDSCH in this time slot, and the base station does not transmit the SPS PDSCH. Specifically, when the base station transmits the common L1 signaling in step 3, the UE may need time to receive and determine the time slot information time, which is assumed to be N2. This operation can be adopted when it is determined to transmit and receive the SPS PDSCH at the time point of N2 after receiving the common L1 signaling in step 3.

[0179] - When the common L1 signaling in step 3 is configured, the UE does not correctly receive the common L1 signaling, and a partial resource domain of the SPS PDSCH that is repeatedly transmitted and received within a time slot period overlaps with the UL symbol or flexible symbol indicated by step 1 or step 2, the UE does not expect to receive the SPS PDSCH in this time slot. Specifically, except for the case where the UE does not correctly receive the common L1 signaling in step 3, when the base station transmits the common L1 signaling in step 3, the UE may need time to receive and determine the time slot information time, which is assumed to be N2. This operation can be adopted when it is determined to receive the SPS PDSCH and when it is determined to transmit and receive the SPS PDSCH before N2.

[0180] In the present disclosure, the detailed meaning of a specific situation that the UE does not expect is considered that when the specific situation occurs, the UE considers this to be an incorrect situation. In addition, for the base station, this can mean performing scheduling to avoid generating a situation that the UE does not expect.

[0181] Figure 10 Shows the repeated transmission (time slot aggregation) of each time slot in a wireless communication system according to an embodiment of the present disclosure.

[0182] Reference Figure 10, in the NR system, to improve the PDSCH reception reliability of the UE, the repeated transmission of the same PDSCH is supported (10-00). The base station can configure the repeated transmission frequency of the PDSCH, such as the pdsch-AggregationFactor in PDSCH-Config, to a higher layer such as RRC. When configuring the repeated transmission frequency, the PDSCH scheduled to the DCI can be repeated with the same number of time slots as the continuous repeated transmission frequency (10-05). The same time resources can be allocated to all the PDSCHs for repeated transmission in a time slot. As Figure 7 shown, this time resource can be the starting position 7-00 and length 7-05 of the OFDM symbols in a time slot indicated by the DCI. In addition, it can be assumed that the same TB can be sent to all the PDSCHs for repeated transmission. The UE can expect that the PDSCH for repeated transmission can be sent through a single layer only. In addition, the redundancy version (RV) of the PDSCH for repeated transmission can be determined according to the index of the PDSCH for repeated transmission and the RV value indicated by the DCI for scheduling the PDSCH, as shown in Table 15 below.

[0183] [Table 15]

[0184]

[0185] In Table 15, n can represent the index of each PDSCH in the repeated transmission frequencies determined to be the higher layer (10-10) and (10-15).

[0186] Referring to the descriptions of the above DCI structure, PDSCH time / frequency resource allocation, and the PDSCH transmission and reception processes performed based on the above, in Release 15, the NR system uses only a single transmission point / panel / beam during the process of repeating the PDSCH. When cooperative communication using multiple transmission points / panels / beams is adopted during the process of repeating the PDSCH, more robust performance for channel congestion, etc. can be obtained. Therefore, in NR Release 16, the repeated transmission technology through multiple transmission points / panels / beams has been actively discussed. At this time, to improve the reception reliability of the UE, it is necessary to combine the transmission signals for each transmit-receive point (TRP) / beam.

[0187] Embodiments of the present disclosure are described in detail with reference to the accompanying drawings. In addition, in the description of the present disclosure, when it is determined that the detailed description of well-known functions or structures in the art makes the gist of the present disclosure unclear, such detailed description will be omitted herein. Considering the functions of the present disclosure, terms used in the present disclosure are selected from currently widely used general terms. However, these terms may vary according to the intentions of those of ordinary skill in the art, precedents, and the emergence of new technologies. Therefore, the terms used in the present disclosure are defined based on their meanings relative to the content discussed throughout the specification, rather than by their simple meanings.

[0188] The base station is the entity that performs UE resource allocation, and may be at least one of a gNode B, an eNodeB, a Node B, a base station (BS), a radio access unit, a base station controller, or a network node. The UE may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing communication functions, and the like. In addition, although one or more embodiments of the present disclosure are described by taking an NR or LTE / LTE-A system as an example, the embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel form. In addition, the embodiments of the present disclosure may be applied to other communication systems with some modifications by those skilled in the art who are familiar with the technical knowledge in the field within the scope of the present disclosure.

[0189] The content of the present disclosure can be applied to FDD systems and TDD systems.

[0190] In the present disclosure, the high-level signaling (or high-level signal) is a signal transmission method that is sent from the base station to the UE through the DL data channel of the physical layer, or from the UE to the base station through the UL data channel of the physical layer, and may be referred to as RRC signaling, PDCP signaling, or MAC CE.

[0191] In the present disclosure, the L1 signal, which is a type of signal sent from the base station to the UE at the physical layer, may be interpreted as DCI, a DCI format, an RNTI scrambled in the CRC of the DCI, or a CORESET, or a specific field in the search space through which the DCI is sent. Therefore, being classified as an L1 signal may mean being classified by the above examples.

[0192] In the present disclosure, when determining whether to apply cooperative communication, the UE can use the following various methods: The PDCCH that allocates the PDSCH to which cooperative communication is applied has a specific format, the PDCCH that allocates the PDSCH to which cooperative communication is applied includes a specific indicator for notifying whether cooperative communication is applied, the PDCCH that allocates the PDSCH to which cooperative communication is applied is scrambled to a specific RNTI, it is assumed that the application of cooperative communication is in a specific part indicated as a higher layer, etc. Then, for ease of explanation, a UE that receives a PDSCH to which cooperative communication is applied based on the above similar conditions may be referred to as a non-coherent joint transmission (NC-JT) case.

[0193] In the present disclosure, determining the priority order between A and B may be differently referred to as selecting a higher priority order according to a predetermined priority order rule and performing an operation corresponding thereto, or omitting or abandoning an operation corresponding to a lower priority. The present disclosure is not limited to the above examples.

[0194] In the present disclosure, although examples are described through multiple embodiments, these examples are not independent, and one or more embodiments can be adopted simultaneously or in combination.

[0195] The 5G wireless communication system can not only support services that require high transmission rates, but also support services with extremely short transmission delays and services that require high connection densities. In a wireless communication network including multiple cells, TRPs, or beams, cooperative communication (coordinated transmission) between each cell, TRP, or / and beam is one of the basic technologies to meet various service requirements by increasing the signal strength received by the UE or effectively performing interference control between each cell, TRP, or / and beam.

[0196] Joint transmission (JT) is a representative transmission technology of the above-mentioned cooperative communication, which can increase the signal strength received by the UE by supporting one UE via different cells, TRPs, or / and beams through the joint transmission technology. Since the channel characteristics between each cell, TRP, or / and beam and the UE may vary greatly from each other, different precoding, MCS, or resource allocation can be applied to the links between each cell, TRP, or / and beam and the UE. In particular, for non-coherent joint transmission (NC-JT) that supports non-coherent precoding between each cell, TRP, or / and beam, the configuration of individual DL transmission information for each cell, TRP, or / and beam is extremely important. The configuration of individual DL transmission information for each cell, TRP, or / and beam is a major factor in increasing the payload required for DL DCI transmission, which may have an adverse impact on the reception performance of the PDCCH used to send DCI. Therefore, in order to support JT, careful design is required to balance the DCI information amount and the PDCCH reception performance.

[0197] Figure 11Shows the antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.

[0198] Reference Figure 11 , shows an example of JT technology and radio resource allocation for the TRP as appropriate. In Figure 11 , 11 - 00 represents an example of Coherent Joint Transmission (C - JT) that supports interference - coding between each cell, TRP, or / and beam. In C - JT, a single data (PDSCH) is transmitted to UE 11 - 15 at TRP A11 - 05 and TRP B 11 - 10, and joint precoding is performed at multiple TRPs. The same DMRS ports for receiving the same PDSCH are transmitted at TRP A 11 - 05 and TRP B 11 - 10, such as DMRS ports A and B at the two TRPs. In this case, the terminal can receive one DCI message, which is used to receive one PDSCH demodulated by DMRS ports A and B.

[0199] In Figure 11 , 11 - 20 represents an example of Non - Coherent Joint Transmission (NC - JT) that supports non - interference - coding between each cell, TRP, or / and beam. For NC - JT, for each of each cell, TRP, or / and beam, the PDSCH is transmitted to UE 11 - 35, and separate precoding can be applied to each PDSCH. Compared with the transmission of a single cell, TRP, or / and beam, each cell, TRP, or / and beam can transmit different PDSCHs to improve the processing rate; or compared with the transmission of a single cell, TRP, or / and beam, each cell, TRP, or / and beam can repeat the transmission of the same PDSCH to improve reliability.

[0200] Various radio resource allocations can be considered. For example, when the frequency and time resources used for PDSCH transmission at multiple TRPs are the same (11 - 40), when the frequency and time resources used at multiple TRPs do not overlap with each other (11 - 45), or when some of the frequency and time resources used at multiple TRPs overlap with each other (11 - 50). In each of the above - mentioned radio resource allocations, when the same PDSCH is repeatedly transmitted at multiple TRPs to improve reliability, the receiving UE may not combine the PDSCHs at the physical layer without knowing whether the PDSCH is repeatedly transmitted, so there may be limitations in improving reliability. Therefore, in the present disclosure, a method for indicating and configuring repeated transmission for improving the reliability of NC - JT transmission is proposed.

[0201] To support NC - JT, various forms, structures, and relationships of DCI can be considered to simultaneously allocate multiple PDSCHs to one UE.

[0202] Figure 12 shows a DCI configuration for cooperative communication in a wireless communication system according to an embodiment of the present disclosure. Referring to Figure 12 , four examples of DCI designs for supporting NC-JT are shown.

[0203] In Figure 12 , Case #1 12-00 is an example as follows: When (N-1) different PDSCHs are transmitted at (N-1) additional TRPs (TRP#1 to TRP#(N-1)), in addition to the serving TRP (TRP#0) for transmitting a single PDSCH, the control information regarding the PDSCH transmitted at the (N-1) additional TRPs is transmitted in the same form (same DCI format) as the control information regarding the PDSCH transmitted at the serving TRP. In other words, the UE can obtain the control information regarding the PDSCH transmitted at different TRPs (TRP#0 to TRP#(N-1)) through DCIs (DCI#0 to DCI#(N-1)) having the same DCI format and the same payload. In the above Case #1, although the degree of freedom of each PDSCH control (allocation) can be fully guaranteed, when each DCI is transmitted at a different TRP, it may cause coverage differences for each DCI, thereby possibly degrading the reception performance.

[0204] In Figure 12 , Case #2 12-05 is an example as follows: When (N-1) different PDSCHs are transmitted at (N-1) additional TRPs (TRP#1 to TRP#(N-1)), in addition to the serving TRP (TRP#0) for transmitting a single PDSCH, the control information regarding the PDSCH transmitted at the (N-1) additional TRPs is transmitted in a different form (different DCI format or different DCI payload) from the control information regarding the PDSCH transmitted at the serving TRP. For example, DCI#0 for transmitting the control information regarding the PDSCH transmitted at the serving TRP (TRP#0) may include all information elements in DCI formats 1_0 to 1_1, and the "shortened" DCIs (sDCI#0 to sDCI#(N-2)) for transmitting the control information regarding the PDSCH transmitted at the cooperative TRPs (TRP#1 to TRP#(N-1)) may include some information elements in DCI formats 1_0 to 1_1. According to an embodiment of the present disclosure, the information not included in the shortened DCI (sDCI) may follow the DCI of the serving TRP (i.e., DCI#0, regular DCI, or nDCI).

[0205] Therefore, compared with the conventional DCI (nDCI) for the control information of PDSCH sent at the serving TRP, the control information of PDSCH sent at the cooperating TRP may have a smaller payload; or compared with nDCI, it includes the same number of reserved bits as the number of lost bits. In the above Case #2, the degree of freedom of each PDSCH control (allocation) can be restricted according to the content of the information elements included in the sDCI, but the reception performance of the sDCI is better than that of the nDCI, so that the probability of the coverage difference of each DCI can be reduced.

[0206] In Figure 12 Case #3 12-10 is another example as follows: When (N-1) different PDSCHs are sent at (N-1) additional TRPs (TRP#1 to TRP#(N-1)), in addition to the serving TRP (TRP#0) for transmitting a single PDSCH, the control information of PDSCH sent at the (N-1) additional TRPs is sent in a form different from the control information of PDSCH sent at the serving TRP (different DCI format or different DCI payload). For example, DCI#0 for the control information of PDSCH sent at the serving TRP (TRP#0) may include all the information elements in DCI formats 1_0 to 1_1; and for the control information of PDSCH sent at the cooperating TRPs (TRP#1 to TRP#(N-1)), only some of the information elements in DCI formats 1_0 to 1_1 may be collected and sent in one "auxiliary" DCI (sDCI). For example, the sDCI may include at least one piece of information in the HARQ-related information, such as frequency-domain resource allocation, time-domain resource allocation, or the MCS of the cooperating TRP. In addition, according to an embodiment of the present disclosure, information such as a BWP indicator or a carrier indicator not included in the sDCI may follow the DCI (DCI#0, conventional DCI, nDCI) of the serving TRP.

[0207] In Case #3, the degree of freedom of each PDSCH control (allocation) can be restricted according to the content of the information elements included in the sDCI, but the reception performance of the sDCI can be adjusted; and compared with Case #1 or #2, the complexity of DCI blind decoding of the UE can be reduced.

[0208] In Figure 12In the following, Case #4 12-15 is as follows: When (N-1) different PDSCHs are transmitted at (N-1) additional TRPs (TRP#1 to TRP#(N-1)), in addition to the serving TRP (TRP#0) for transmitting a single PDSCH, the control information regarding the PDSCH transmitted at the (N-1) additional TRPs is transmitted with the same DCI as the control information regarding the PDSCH transmitted at the serving TRP. In other words, the UE can obtain the control information regarding the PDSCH transmitted at different TRPs TRP#0 to TRP#(N-1) through a single DCI. In Case #4, the complexity of DCI blind decoding of the UE does not increase, but the degree of freedom of PDSCH control (allocation) decreases. For example, the number of cooperating TRPs is restricted according to the limitation of the long DCI payload.

[0209] In the following description and embodiments, the sDCI may be referred to as various auxiliary DCIs, such as a shortened DCI, an auxiliary DCI, or a regular DCI (the above DCI formats 1_0 to 1_1) including the PDSCH control information transmitted at the cooperating TRP. Unless a specific limitation is specified, this description also applies to various auxiliary DCIs. In addition, the name of each DCI is exemplary, and the present disclosure is not limited thereto.

[0210] In the following description and embodiments, one or more DCIs (PDCCHs) used to support the above Cases #1, #2, and #3 of NC-JT can be classified as NC-JT based on multiple PDCCHs, and a single DCI (PDCCH) used to support the above Case #4 of NC-JT can be classified as NC-JT based on a single PDCCH.

[0211] In an embodiment of the present disclosure, in practical applications, the "cooperating TRP" may be replaced with various terms such as "cooperating panel" or "cooperating beam".

[0212] In an embodiment of the present disclosure, "when applying NC-JT" may be interpreted differently according to the situation, such as "when the UE simultaneously receives one or more PDSCHs in a BWP", "when the UE simultaneously receives a PDSCH based on two or more TCIs in a BWP", or "when the PDSCH received by the UE is associated with one or more DMRS port groups", but one expression is used for the convenience of explanation.

[0213] In the present disclosure, various radio protocol architectures for NC-JT can be used according to the TRP deployment scenario. For example, if there is no or little backhaul latency between cooperating TRPs, an architecture based on MAC layer multiplexing (CA type method) can be used. On the contrary, when the backhaul latency between cooperating TRPs is large (e.g., when CSI exchange or scheduling information exchange between cooperating TRPs takes 2 ms or longer), anti-latency characteristics can be obtained by using an independent architecture for each TRP from the RLC layer (DC type method).

[0214] In the present embodiment, as described in the above first embodiment, a detailed configuration and indication method for repeatedly transmitting the same PDSCH of two or more TRPs to the same transmission frequency band (e.g., transmission frequency band, component carrier, or BWP) are provided.

[0215] Figure 13 It shows repeated transmission among multiple TRPs using various resource allocation methods according to an embodiment of the present disclosure in a wireless communication system. Refer to Figure 13 , an example of repeated transmission of the same PDSCH by two or more TRPs is shown.

[0216] As described above, in the current Rel-15 NR system, when repeatedly transmitting the same PDSCH, as many time slots as the repetition transmission frequency are required, and for each repeated transmission, the same cell, TRP, and / or beam are used. On the contrary, through the embodiments of the present disclosure, since different TRPs are used for each repeated transmission in each time slot, higher reliability can be obtained (13-00 and 13-05). According to the UE's capabilities and latency time requirements, the available resource status between TRPs, etc., different repeated transmission methods can be used. For example, when the UE has the ability to receive NC-JT, since each TRP uses a method of transmitting the same PDSCH to the same time-frequency resource, the utilization rate of frequency resources can be increased, and the latency time required for PDSCH decoding may be reduced (13-10 and 13-15). When there is little interference between beams, since the beams between the TRPs to be transmitted simultaneously are close to orthogonal, this method is effective. In another example, each TRP can use a method of transmitting the same PDSCH to the same time and with non-overlapping frequency resources (13-20 and 13-25). When the interference between the beams of the TRPs to be transmitted simultaneously is large and the available frequency resources of each TRP are large, this method is effective. In another example, each TRP can use a method of transmitting the same PDSCH to different OFDM symbols in the same time slot (13-30 and 13-35). When the available frequency resources of each TRP are not large and the amount of transmitted data is small, this method is effective. In addition to the above methods, modifications can also be made based on the above methods.

[0217] In the above method, a single DCI can be for user-scheduled repeated transmission (13-00, 13-10, 13-20, and 13-30), and the DCI can indicate a list of all TRPs participating in the repeated transmission. The list of TRPs to be repeatedly transmitted can be indicated in the form of a TCI state list, and the length of the TCI state list can be dynamically changed. To improve reliability, the DCI can be repeatedly transmitted, and different beams can be applied to each DCI during the repeated transmission process. Alternatively, multiple DCIs can be used to schedule the repeated transmission (13-05, 13-15, 13-25, and 13-35), and each DCI can correspond to the PDSCH of a different TRP participating in the repeated transmission. The TRP of each DCI can be indicated in the form of a TCI state or resources for repeated transmission, and its detailed description is described in the following embodiments. Alternatively, a shortened DCI can also be used to schedule the repeated transmission, and each of the regular DCI and the secondary DCI can correspond to the PDSCH of a different TRP participating in the repeated transmission. The above indication method can be generally applied to repeated transmission through multiple TRPs and different data transmissions through multiple TRPs.

[0218] [Embodiment]

[0219] Figure 14 A method of repeatedly transmitting a PDSCH using multiple TRPs in a wireless communication system according to an embodiment of the present disclosure is shown.

[0220] Figure 14 Embodiment 14-00 of a single DCI shows an example in which a base station repeatedly transmits the same PDSCH from different TRPs by using a single DCI 14-05. TRP 1 transmits PDSCH 14-10 to the UE by using the first four OFDM symbols, and TRP2 repeatedly transmits the same PDSCH 14-15 to the UE by using the subsequent four OFDM symbols. After receiving these two PDSCHs, the UE can improve the reception reliability by combining. The DCI can be sent from TRP 1 or TRP 2 to the UE, and as Figure 13 described, the DCI information can include information on repeatedly transmitting the PDSCH from different TRPs. Figure 14 In embodiment 14-00 of a single DCI, the repeated transmission of the same PDSCH is only exemplary, and the PDSCH repeated transmission can be performed by using different OFDM symbols in one time slot or different time slots. In addition, one PDSCH can be transmitted on different time slots.

[0221] The repeated transmission of the same PDSCH based on multiple TRPs in embodiment 14-00 of a single DCI can support as Figure 10The above-mentioned repeated transmission with the same symbol form based on time slots, or as Figure 13 and Figure 14 the repeated transmission with different symbol forms in (or between) time slots as described above, and the function can be selected by a high-level signal or an L1 signal. The method of indicating repeated transmission in a single DCI is at least one of the following.

[0222] - Repeated transmission frequency: The repeated transmission frequency is included in the DCI field. The time-domain resource allocation (TDRA) field of the DCI notifies the starting symbol and length of the PDSCH in a time slot, and the repeated transmission frequency notifies the additional transmission frequency of the PDSCH. In another example, the repeated transmission frequency field can be included as an additional row in the TDRA table instead of existing separately. Table 16 shows an example.

[0223] [Table 16]

[0224]

[0225] - Number of TCI states: As Figure 13 and Figure 14 described in, the UE may be able to pre-configure one or more sets of TCI states as high-level signals (MAC CE) to transmit and receive multiple TRPs and data. Therefore, the size of the TCI state set (i.e., the number of TCI states) is the PDSCH repeated transmission frequency. Specifically, the number of repeated transmission frequencies of the PDSCH scheduled to the non-fallback DCI format 1_x can be the same as the number of TCI states. The number of repeated transmissions of the PDSCH scheduled to the fallback DCI format 1_0 is 1. In other words, it is a single transmission rather than a repeated transmission. In another example, the number of PDSCH repeated transmissions can be a multiple of the number of TCI states (i.e., the TCI state multiplied by X, where X is a natural number). In this case, the value of X can be determined by a high-level signal or an L1 signal.

[0226] Figure 14 Examples of multiple DCI implementations 14 - 20 show that the UE receives multiple DCIs and repeatedly receives the same PDSCH from different TRPs. Specifically, the UE is scheduled for PDSCH 14 - 30 consisting of four OFDM symbols by DCI 14 - 23 received from TRP 1, and then scheduled to PDSCH14 - 35 consisting of four OFDM symbols by DCI 14 - 25 received from TRP 2. Although these two PDSCHs are scheduled by different DCIs respectively, they have the same TB. The present disclosure is not limited to this, and the case where the two PDSCHs have different TBs can be considered. After the UE receives the two PDSCHs, when they have the same TB, the reception reliability can be improved by combining. Different from the repeated transmission of the PDSCH by multiple TRPs based on a single DCI, inFigure 14 In this case, it is assumed that the TRP that transmits and receives DCI and the TRP of the PDSCH that is transmitted and received under the scheduling of the DCI are the same TRP. As a reference, the method for determining whether the PDSCHs 14-30 and 14-35 scheduled in different DCIs 14-23 and 14-25 have the same TB or different TBs is as follows.

[0227] - When two DCIs have the same HARQ process number and NDI value, the two PDSCHs have the same TB. When at least one of them has a different value, the two PDSCHs may have different TBs from each other. The HARQ process number and NDI are merely exemplary, and like other time resource allocation fields or frequency resource allocation fields in Figure 5 above, the above DCI fields can be replaced and applied. For example, when the time-frequency resource domains of the PDSCHs scheduled in two DCIs completely or at least partially overlap with each other, the UE can determine that the TBs scheduled in the two DCIs are the same. Alternatively, when the values of the Counter DAI or Total DAI in the two DCIs are the same, the PDSCHs scheduled in the two DCIs may include the same TB. The above determination conditions can always be specified in the standard or activated / deactivated by a high-level signal configuration.

[0228] - In the case where slot-based repeated transmission is pre-configured by a high-level signal, when the UE receives two identical DCIs with the same HARQ process number and NDI value, the UE considers that PDSCH repeated transmission is performed in the slot, and the transmission mode in the slot is repeated again in the slot period. In the example, in Figure 14 among the multiple DCI embodiments 14-20, when the UE is pre-configured with slot period repeated transmission by a high-level signal and the number of repeated transmission slots is 2, the UE considers that the PDSCHs 14-30 and PDSCH 14-35 transmitted and received in one slot are transmitted and received in the next slot in exactly the same symbol pattern.

[0229] The repeated transmission of the same PDSCH in the multiple DCI embodiments 14-20 is merely exemplary, and PDSCH repeated transmission can be performed by using different OFDM symbols in one slot or different slots. In addition, one PDSCH can be transmitted on different slots. As described in Figure 13 and Figure 14 above, the repeated transmission of the same PDSCH based on multiple TRPs based on multiple DCIs can support repeated transmission with different symbol forms in a slot (or between slots), and the function can be selected by a high-level signal or an L1 signal.

[0230] In Figure 14In this case, it is assumed that the PDSCH transmitted repeatedly by a single DCI or multiple DCIs consists of DL symbols in one time slot in TDD or FDD, as shown in the single DCI embodiment 14-00 or the multiple DCI embodiment 14-20. However, when there are UL symbols or flexible symbol links in TDD, the UE may perform PDSCH retransmission different from embodiments 14-00 or 14-20. Accordingly, as described above Figure 9 The PDSCH retransmission and reception operations are described according to the case where the TDD configuration is configured by the high-level signal as in step 1 or step 2, and the case where the TDD configuration is indicated by the UE common signaling configured in step 3. Steps 1, 2, 3, and 4 described below follow the Figure 9 concepts defined in. The UE performs at least one of the following operations. In addition, the UE may perform all operations or a combination of some of them. The following PDSCH retransmission is scheduled by DCI format 1_x, and the retransmission means retransmission in a time slot period or a sub-time slot in a time slot. The sub-time slot size may be preconfigured by a high-level signal or determined by an L1 signal, such as the value L determined by the SLIV value in the time resource allocation field of the DCI field.

[0231] - Operation 1: For the case where the configuration of step 3 is present and the case where the configuration of step 3 is not present, the symbols that the UE does not expect to be scheduled for PDSCH retransmission are indicated as UL through step 1 or step 2.

[0232] - Operation 2: For the case where the configuration of step 3 is present and the case where the configuration of step 3 is not present, the symbols for transmitting the first PDSCH among the symbols that the UE does not expect to be scheduled for PDSCH retransmission are not indicated as UL through step 1 or step 2, and when at least one of the symbols for transmitting other PDSCHs other than the first PDSCH is indicated as UL through step 1 or step 2, the UE receives the PDSCH for the symbols other than the symbols indicated as UL. For example, one of the other PDSCHs is scheduled for symbols #5 to #8 in a time slot, and when symbol #8 is configured as a UL symbol through step 1 or step 2, the UE receives the PDSCH for symbols #5 to #7. In this state, the data transmitted to the PDSCH is rate-matched with symbols #5 to #7 and sent from the base station to the UE; or after the data transmitted to the PDSCH is rate-matched with symbols #5 to #8, symbol #8 is punctured and the actual PDSCH transmission and reception are performed for symbols #5 to #7. In this state, when the actual effective code rate of the PDSCH retransmission exceeds 0.95 or 0.932, the PDSCH transmission and reception are not performed, and the UE does not receive the PDSCH.

[0233] - Operation 3: For both the case of the configuration in step 3 and the case of not being in the configuration of step 3, the symbol for transmitting the first PDSCH among the symbols for PDSCH repeated transmission that the UE does not expect to be scheduled to is indicated as UL through step 1 or step 2, and when at least one of the symbols for transmitting other PDSCHs except the first PDSCH is indicated as UL through step 1 or step 2, the UE does not perform PDSCH reception. In other words, the base station does not perform the transmission of PDSCH. In the example, when a total of three PDSCHs, which are successively referred to as PDSCH 1, PDSCH 2, and PDSCH 3, are repeatedly transmitted, the symbol for PDSCH 1 that the UE does not expect to be scheduled to is not indicated as UL through step 1 or step 2. Instead, although the symbols for PDSCH 2 or PDSCH 3 can be indicated as UL symbols through step 1 or step 2, when one of the symbols in PDSCH 2 is indicated as a UL symbol through step 1 or step 2, the UE does not expect to receive PDSCH. When all the symbols in PDSCH 3 are not indicated as UL symbols through step 1 or step 2, the UE receives PDSCH.

[0234] - Operation 4: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the symbol for PDSCH repeated transmission that the UE does not expect to be scheduled to is not indicated as a UL symbol through step 3.

[0235] - Operation 5: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the symbol to which the first PDSCH among the PDSCHs for repeated transmission and reception is to be allocated is not indicated as a UL symbol through step 3, and when at least one of the symbols to which other PDSCHs except the first PDSCH are allocated is indicated as UL (or flexible symbol), the UE receives the PDSCH for the other symbols except the symbols indicated as UL (or flexible link). For example, one of the other PDSCHs is scheduled to symbols #5 to #8 in a time slot, and among them, when symbol #8 is configured as UL (or flexible symbol) through step 3, the UE receives the PDSCH in symbols #5 to #7. In this state, the data sent to the PDSCH is rate-matched with symbols #5 to #7 and sent from the base station to the UE; or after the data sent to the PDSCH is rate-matched with symbols #5 to #8, symbol #8 is punctured and the actual PDSCH transmission and reception are performed on symbols #5 to #7. In this state, when the actual effective code rate of the repeated PDSCH transmission exceeds 0.95 or 0.932, the PDSCH transmission and reception are not performed, and the UE does not receive the PDSCH.

[0236] - Operation 6: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the UE does not expect the symbol to which the first PDSCH among the PDSCHs for repeated transmission and reception is to be allocated to be indicated as a UL symbol by step 3, and when at least one of the symbols to which other PDSCHs except the first PDSCH are allocated is indicated as UL by step 3, the UE receives the PDSCH for the other symbols except the symbols indicated as UL. For example, when one of the other PDSCHs is scheduled to symbols #5 to #8 in a time slot, and among them, when symbol #8 is configured as UL by step 3, the UE receives the PDSCH from symbols #5 to #7. In this state, the data sent to the PDSCH is rate-matched with symbols #5 to #7 and sent from the base station to the UE; or after the data sent to the PDSCH is rate-matched with symbols #5 to #8, puncturing is performed on symbol #8 and actual PDSCH transmission and reception are performed on symbols #5 to #7. In this state, when the actual effective code rate of the repeated PDSCH exceeds 0.95 or 0.932, the PDSCH transmission and reception are not performed, and the UE does not receive the PDSCH.

[0237] - Operation 7: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the UE does not expect the symbol to which the first PDSCH among the PDSCHs for repeated transmission and reception is to be allocated to be indicated as a UL symbol by step 3, and when at least one of the symbols to which other PDSCHs except the first PDSCH are allocated is indicated as a UL symbol (or flexible symbol) by step 3, the UE does not perform PDSCH reception. In other words, the base station does not perform PDSCH transmission. In the example, when a total of three PDSCHs called PDSCH 1, PDSCH 2, and PDSCH 3 are repeatedly transmitted, the UE does not expect the symbol scheduled to PDSCH 1 to be indicated as UL by step 3. Instead, although the symbols scheduled to PDSCH 2 or PDSCH 3 can be indicated as UL symbols (or flexible symbols) by step 3, when one of the symbols in PDSCH 2 is indicated as a UL symbol (or flexible symbol) by step 3, the UE does not expect to receive the PDSCH. When none of the symbols of PDSCH 3 are indicated as UL symbols (or flexible symbols) by step 3, the UE receives the PDSCH.

[0238] - Operation 8: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the UE does not expect the symbol to which the first PDSCH of the PDSCH to be repeated transmitted and received is to be allocated to be indicated as a UL symbol by step 3, and when at least one of the symbols to which other PDSCHs other than the first PDSCH are allocated is indicated as a UL symbol by step 3, the UE does not perform PDSCH reception. In other words, the base station does not perform PDSCH transmission. In the example, when a total of three PDSCHs called PDSCH 1, PDSCH 2, and PDSCH 3 are repeatedly transmitted in sequence, the UE does not expect the symbol scheduled to PDSCH1 to be indicated as UL by step 3. On the contrary, although the symbols scheduled to PDSCH 2 or PDSCH 3 may be indicated as UL symbols by step 3, when one of the symbols in PDSCH 2 is indicated as a UL symbol by step 3, the UE does not expect to receive PDSCH. When none of the symbols of PDSCH 3 are indicated as UL symbols by step 3, the UE receives PDSCH.

[0239] - Operation 9: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the UE does not expect the symbol to which the first PDSCH among the PDSCHs for repeated transmission and reception is to be allocated to be indicated as a UL symbol by step 3, and when at least one of the symbols to which other PDSCHs except the first PDSCH are allocated is indicated as a UL symbol by step 3, the UE does not transmit PDSCH for these symbols, and after the UL symbol, PDSCH transmission is performed for the DL (or flexible) symbols capable of PDSCH transmission. In the example, in the case where a total of two PDSCHs in a time slot are scheduled for repeated transmission and reception to PDSCH 1 and PDSCH 2 having the same length in sequence, the symbol to which PDSCH 1 is allocated is indicated as a DL symbol by step 3, and when some of the symbols to which PDSCH 1 is allocated are indicated as UL symbols (or flexible symbols) by step 3, the UE determines to transmit and receive PDSCH 2 in the DL symbols to which all PDSCH 2s in the same time slot are allocated after the UL symbol (or flexible symbol) indicated in step 3. In other words, the UE considers that the time resource domain for transmitting and receiving PDSCH 2 is delayed. The delay of PDSCH 2 in the time slot is allowed. When all PDSCH 2s are not allocated DL symbols, the UE considers that the transmission and reception of PDSCH 2 are omitted. In another example, in the case where the repeated transmission and reception of a total of three PDSCHs (i.e., PDSCH 1, PDSCH 2, and PDSCH 3) in a time slot are scheduled, when PDSCH 2 is delayed, PDSCH 3 is further delayed for transmission and reception after PDSCH 2.

[0240] - Operation 10: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the UE does not expect the symbol to which the first PDSCH of the PDSCH to be repetitively transmitted and received is to be allocated to be indicated as a UL symbol through step 3, and when at least one of the symbols to which other PDSCHs except the first PDSCH are allocated is indicated as a UL symbol through step 3, the UE does not transmit the PDSCH for these symbols, and after the UL symbol, the UE performs PDSCH transmission for the DL symbols capable of PDSCH transmission. In the example, in the case where a total of two PDSCHs are successively scheduled to PDSCH 1 and PDSCH 2 with the same length in one time slot for repetitive transmission and reception, the symbol to which PDSCH 1 is allocated is indicated as a DL symbol (or flexible symbol) through step 3, and when some of the symbols to which PDSCH 1 is allocated are indicated as UL symbols (or flexible symbols) through step 3, the UE determines to transmit and receive all of PDSCH 2 in the DL symbols (or flexible symbols) to which all of PDSCH 2 in the same time slot are allocated after the UL symbol (or flexible symbol) indicated by step 3. In other words, the UE considers that the time resource domain for transmitting and receiving PDSCH 2 is delayed. The delay of PDSCH 2 in the time slot is allowed. When all of PDSCH 2 are not allocated DL symbols (or flexible symbols), the UE considers that the transmission and reception of PDSCH 2 are omitted. In another example, in the case where the repetitive transmission and reception of a total of three PDSCHs (i.e., PDSCH 1, PDSCH 2, and PDSCH 3) are scheduled in one time slot, when PDSCH 2 is delayed, PDSCH 3 is further delayed for transmission and reception after PDSCH 2.

[0241] - Operation 11: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the UE receives the scheduling of PDSCH repetitive transmission, and when at least one of the symbols to which each PDSCH is allocated for the PDSCH to be repetitively transmitted is indicated as a UL symbol (or flexible symbol) through step 3, the UE considers that the transmission and reception of the PDSCH are omitted. For example, in the case where the repetitive transmission of PDSCH 1 and PDSCH 2 is scheduled, when at least one of the symbols to which PDSCH 1 is allocated is indicated as UL (or flexible symbol) through step 3, the UE does not perform the transmission and reception of PDSCH 1 and only receives PDSCH 2.

[0242] - Operation 12: When the configuration of step 3 is received and the signaling (DCI format 2_0) is correctly received, the UE receives the scheduling of the PDSCH retransmission, and when at least one of the symbols to which each PDSCH is assigned for the PDSCH to be retransmitted is indicated as a UL symbol by step 3, the UE considers the transmission and reception of the PDSCH to be omitted. For example, in the case where the retransmission of PDSCH 1 and PDSCH 2 is scheduled, when at least one of the symbols to which PDSCH 1 is assigned is indicated as a UL symbol by step 3, the UE does not perform the transmission and reception of PDSCH 1 and only receives PDSCH 2.

[0243] - Operation 13: When the configuration of step 3 is received but the signaling (DCI format 2_0) is not correctly received, or when, although the signaling (DCI format 2_0) is received, it is exactly within the PUSCH preparation time T after the symbol in which the signaling (DCI format 2_0) is transmitted and received proc,2 inside, the UE does not know the slot information indicated in the signaling. Specifically, since the DL symbol information or UL symbol information in the slot indicated in step 1 or step 2 is not changed again in step 3, even when the UE does not know the information of step 3, the UE can determine this information, and when a specific set of symbols in the slot is determined as flexible symbols by step 1 or step 2, the UE may not know whether the symbols indicated by step 3 are UL symbols, DL symbols, or flexible symbols without knowing the information of step 3. Therefore, when at least one of the symbols scheduled for the PDSCH retransmission is determined as a UL symbol (or flexible symbol) by step 1 or step 2, the UE can omit all PDSCH retransmissions. Alternatively, when at least one of the symbols scheduled for the PDSCH retransmission is determined as a UL symbol (or flexible symbol) by step 1 or step 2, the UE only omits the corresponding PDSCH reception. In other words, when all the symbols to which some retransmitted PDSCHs are to be assigned are configured as DL symbols by step 1 or step 2, the UE receives the PDSCH. Alternatively, the UE determines that all the PDSCH retransmission scheduling information is valid and receives all PDSCHs. Alternatively, the UE only receives the information about the first PDSCH transmission in the PDSCH retransmission scheduling information regardless of the symbol information configured in step 1 or step 2, and the UE omits the transmission and reception of other PDSCHs.

[0244] - Operation 14: When the configuration of step 3 is received but the signaling (DCI format 2_0) is not correctly received, or when, although the signaling (DCI format 2_0) is received, it is exactly within the PUSCH preparation time after the symbol in which the signaling (DCI format 2_0) is transmitted and received Tproc,2When repeating the transmission and reception of the scheduled PDSCH, the UE does not expect the symbols to which the first PDSCH is allocated to be indicated as UL symbols or flexible symbols through step 1 or step 2, or even when these symbols are indicated as flexible symbols through step 1 or step 2, the UE receives the first PDSCH. When repeating the transmission and reception of the scheduled PDSCH, when at least one of the symbols to which subsequent PDSCHs other than the first PDSCH are allocated is indicated as a UL symbol or a flexible symbol through step 1 or step 2, the UE does not perform PDSCH reception. For example, in the case of repeating the transmission and reception of three PDSCHs, when one of the symbols to which the second PDSCH is allocated is indicated as a flexible symbol through step 1 or step 2, and the symbols to which the other first PDSCH and the third PDSCH are allocated are both indicated as DL symbols, the UE performs the reception of the first PDSCH and the third PDSCH except for the second PDSCH.

[0245] Although the above description of the operation is limited to the PDSCH scheduled by DCI, this description can also be fully applied to the SPS PDSCH that is transmitted and received without separate DCI scheduling. In addition, since the first transmitted and received SPS PDSCH in the SPS PDSCH is scheduled by DCI, the SPS PDSCH is considered to be the PDSCH scheduled by DCI.

[0246] Figure 17 A data transmission method according to an embodiment of the present disclosure is shown.

[0247] When the UE receives PDSCH scheduling through one DCI, the value m of the time resource allocation information field included in the DCI can provide m + 1 index rows of the time resource allocation information table. The time resource allocation table can be configured as shown in Table 17 below.

[0248] [Table 17]

[0249]

[0250] In Table 17, dmrs-TypeA-Position is information that notifies whether the DMRS is located at the second position or the third position in a time slot when the DMRS has PDSCH mapping type A mode, and this information can be configured by a higher-level signal. The dmrs-TypeA-Position value may not be applied to PDSCH mapping type B. The PDSCH mapping type can be a field indicating the position information of the DMRS present in the PDSCH, and when it is type A, the DMRS can be present at a fixed symbol position in the time slot regardless of the start time point and length of the scheduled PDSCH, and when it is type B, the DMRS may be present in the start symbol of the scheduled PDSCH. K0 represents the offset information between the time slot where the PDCCH is located and the time slot where the PDSCH scheduled by the PDCCH is located, S represents the start symbol of the PDSCH, L represents the length of the PDSCH, and Repetition represents the frequency of repeated transmission of the PDSCH. The Repetition information may not exist.

[0251] Therefore, the UE can receive the time resource allocation field value m of the DCI by identifying the time resource allocation information of the scheduled PDSCH and the position information of the DMRS based on the time slot offset corresponding to m+1 indices of the time resource allocation table, the SLIV including the combination of S and L (or, the information of a single S and L), and the PDSCH mapping type.

[0252] According to an embodiment of the present disclosure, the information about the time slot to which the PDSCH is allocated is where n can be the time slot for transmitting and receiving the scheduled DCI. K0 represents a value determined based on the subcarrier spacing information of the PDSCH, and μ PDSCH and μ PDCCH respectively represent the configuration information of the subcarrier spacings of the PDSCH and the PDCCH. Figure 17 An example thereof is shown. In 17-1 (or 17-11), the UE receives PDCCH 17-3 or 17-13 in time slot n, and transmits and receives PDSCH 17-5 or 17-15 scheduled by the PDCCH in time slot k, where time slot k is The case where the subcarrier spacings of the PDCCH and the PDSCH are different from each other may include: the case where the cells or carriers for transmitting and receiving the PDCCH and the PDSCH are different from each other and the subcarrier spacings configured in the cells or carriers are different from each other; or the case where although the PDCCH and the PDSCH are present in the same cell or carrier but have different BWPs (frequency BWPs), where each BWP is configured with a different subcarrier spacing. For 15 kHz, μ PDSCH and μ PDCCH The values of are 0; for 30 kHz; μ PDSCHand μ PDCCH The value of is 1; for 60 kHz, μ PDSCH and μ PDCCH The value of is 2; and for 120 kHz, μ PDSCH and μ PDCCH The value of is 3.

[0253] The starting symbol S can be determined by the following two methods.

[0254] - Method 17-1: When the UE receives a high-level signal indicating a change in the reference time point of the starting symbol S to which the PDSCH is assigned, and receives a PDSCH scheduled by a DCI format including a CRC scrambled with a C-RNTI, MCS-RNTI, or CS-RNTI having a PDSCH mapping type B and a K0 value of 0, the first symbol S0 at the PDCCH monitoring time point (or PDCCH resource or CORESET) when the DCI format is detected at the starting symbol S can be determined as a reference.

[0255] When the subcarrier spacing and cyclic prefix of the PDCCH and PDSCH are the same, the above Method 1 can be adopted. According to an embodiment of the present disclosure, when the subcarrier spacing or cyclic prefix of the PDCCH and PDSCH are different from each other, at least one of the following detailed methods can be adopted together with Method 17-1. In other words, some or all combinations of the following detailed methods can be adopted together with Method 17-1.

[0256] - Method 17-1-1: The UE regards or determines as S0 the first symbol in the PDSCH symbol that completely or partially overlaps with the first symbol in the PDCCH where the DCI format for scheduling the PDSCH is detected.

[0257] - Method 17-1-2: The UE regards or determines as S0 the last symbol in the PDSCH symbol that completely or partially overlaps with the first symbol in the PDCCH where the DCI format for scheduling the PDSCH is detected.

[0258] These methods are not limited to the case where the subcarrier spacing or cyclic prefix of the PDCCH and PDSCH are different from each other, and can also be generally adopted in general cases.

[0259] - Method 17-2: In all cases other than those described in Method 17-1, the UE can determine the starting symbol S based on the first symbol S0 (S0 = 0) in the time slot in which the PDSCH is scheduled.

[0260] According to an embodiment of the present disclosure, Method 17-1 can be adopted only when the subcarrier spacing or cyclic prefix of the PDCCH and the PDSCH are the same. Alternatively, in the case of cross-carrier scheduling of the PDCCH and the PDSCH, Method 17-1 may not be adopted. In other words, the UE may adopt Method 17-2.

[0261] In another example, only when the subcarrier spacing value μ of the PDCCH PDCCH is equal to or greater than the subcarrier spacing value μ of the PDSCH PDSCH can Method 17-1 be adopted.

[0262] In another example, when the subcarrier spacing value μ of the PDCCH PDCCH is less than the subcarrier spacing value μ of the PDSCH PDSCH , and the starting symbol for transmitting the PDCCH does not belong to the time slot indicated by k0 being transmitted or is earlier than the first symbol in the time slot indicated by k0, Method 17-1 may not be adopted. In other words, the UE may adopt Method 17-2.

[0263] The length L can represent L consecutive symbols to which the PDSCH is allocated starting from the starting symbol, and can be determined from the SLIV value by the following Equation 17-1.

[0264] [Equation 17-1]

[0265]

[0266] For a normal cyclic prefix, the UE determines that only values of S and L that satisfy S0 + S + L ≤ 14 are valid time resource allocation information for the PDSCH. For an extended cyclic prefix, the UE determines that only values of S and L that satisfy S0 + S + L ≤ 12 are valid time resource allocation information for the PDSCH. For combinations of S and L that do not meet the above conditions, the UE may determine that the DCI information has been incorrectly determined and consider it an error situation.

[0267] According to an embodiment of the present disclosure, information about the time slot to which the PDSCH is allocated is where n may be the time slot for transmitting and receiving the DCI. K0 can represent a value determined based on the subcarrier spacing information of the PDSCH, and μ PDSCH and μ PDCCH can respectively represent the configuration information of the subcarrier spacing of the PDSCH and the PDCCH. Figure 17 An example thereof is shown. In 17-1 (or 17-11), the UE receives the PDCCH 17-3 or 17-13 in the time slot n, and the PDSCH 17-5 or 17-15 scheduled by the PDCCH is transmitted and received in the time slot k. The time slot k is The case where the subcarrier spacings of PDCCH and PDSCH are different from each other may include: the case where PDCCH and PDSCH are transmitted and received in different cells or carriers and the subcarrier spacings configured in the cells or carriers are different from each other; or the case where although PDCCH and PDSCH are in the same cell or carrier but both have different BWPs and the BWPs are configured with different subcarrier spacings. For 15 kHz, μ PDSCH and μ PDCCH have a value of 0; for 30 kHz, μ PDSCH and μ PDCCH have a value of 1; for 60 kHz, μ PDSCH and μ PDCCH have a value of 2; and for 120 kHz, μ PDSCH and μ PDCCH have a value of 3.

[0268] The starting symbol S can be determined by the following two methods.

[0269] - Method 17-3: When the UE receives a high-level signal indicating a change in the reference time point of the starting symbol S to which the PDSCH is assigned, and receives a PDSCH scheduled by a DCI format including a CRC scrambled to a C-RNTI, MCS-RNTI, or CS-RNTI having a PDSCH mapping type B and a K0 value of 0, the first symbol S0 of the PDCCH monitoring time point (or PDCCH resource or CORESET) when the DCI format is detected at the starting symbol S can be determined as a reference. Specifically, S2 represents the first symbol of the PDCCH monitoring time point (or CORESET) in the time slot (or cell or BWP) in which the PDCCH is scheduled, and S1 can represent the symbol index value of the time slot (or cell or BWP) in which the PDSCH is scheduled. The relationship between S2 and S1 can be determined by the following conditional expression 17-2. is the number of symbols in the time slot, 14 for the normal cyclic prefix and 12 for the extended cyclic prefix.

[0270] [Conditional expression 17-2]

[0271]

[0272] Alternatively, the following conditional expression 17-3 can be adopted.

[0273] [Conditional expression 17-3]

[0274]

[0275] When μ PDSCH≥ μ PDCCH and S2 < A iWhen the UE does not expect to adopt Method 17-3. In other words, it is determined to adopt Method 17-4. In the above Conditional Expression 17-2 or Conditional Expression 17-3, or can be interchanged. In addition, "≤" and "<" can be interchangeably applied to Conditional Expression 17-2 or Conditional Expression 17-3. In addition, "≥" and ">" can be interchangeably applied to Conditional Expression 17-2 or Conditional Expression 17-3.

[0276] - Method 17-4: For all cases other than those described in Method 17-3, the UE can determine the starting symbol S based on the first symbol S1 (S1 = 0) in the time slot in which the PDSCH is scheduled.

[0277] According to an embodiment of the present disclosure, Method 17-3 can be adopted only when the subcarrier spacing or cyclic prefix of the PDCCH and the PDSCH are the same. Alternatively, in the case of cross-carrier scheduling of the PDCCH and the PDSCH, Method 17-3 may not be adopted. In other words, the UE can adopt Method 17-4.

[0278] In another example, only when the subcarrier spacing value μ of the PDCCH PDCCH is equal to or greater than the subcarrier spacing value μ of the PDSCH PDSCH can Method 17-3 be adopted.

[0279] In another example, when the subcarrier spacing value μ of the PDCCH PDCCH is less than the subcarrier spacing value μ of the PDSCH PDSCH , and the starting symbol used to transmit the PDCCH does not belong to the time slot indicated by k0 or is earlier than the first symbol in the time slot indicated by k0, Method 17-3 may not be adopted. In other words, the UE adopts Method 17-4.

[0280] The length L can represent L consecutive symbols to which the PDSCH is allocated starting from the starting symbol, and can be determined by the following Conditional Expression 17-5 from the SLIV value.

[0281] [Conditional Expression 17-5]

[0282]

[0283] For a normal cyclic prefix, the UE determines that only the values of S and L that satisfy S1 + S + L ≤ 14 are valid time resource allocation information for the PDSCH. For an extended cyclic prefix, the UE determines that only the values of S and L that satisfy S1 + S + L ≤ 12 are valid time resource allocation information for the PDSCH. For combinations of S and L that do not satisfy the above conditions, the UE can determine that the DCI information has been incorrectly determined and consider it an error situation.

[0284] Next, in Figure 18 , a method of adopting Method 17-1 and Method 17-2 in the case of cross-carrier scheduling is described (including the descriptions above Figure 17 ).

[0285] Figure 18 A method of adopting cross-carrier scheduling according to an embodiment of the present disclosure is shown.

[0286] In cross-carrier scheduling, cell 18-00 that sends and receives control information and cell 18-06 that sends and receives data information. For example, the cell 18-00 that sends and receives control information is referred to as a scheduling cell or a primary cell, and the cell that sends and receives data information according to the control information is referred to as a scheduling cell or a secondary cell. In addition, one or more BWPs 18-02 and 18-04 may exist in the cell 18-00 that sends and receives control information, and one or more BWPs 18-08 and 18-10 may exist in the cell 18-06 that sends and receives data information.

[0287] Figure 17 The above Method 17-1 and 17-2 in Figure 18 can be adopted as follows. In the scheduling cell 18-00, the BWP that sends and receives control information may be BWP 18-02; and in the scheduling cell 18-06, the BWPs that can be scheduled according to the control information may be BWPs 18-08 and 18-10. For example, the cross-carrier scheduling operation may be performed by indicating an indicator (carrier indicator) of the cross-carrier and a field (BWP indicator) indicating the bandwidth in the control information field. Alternatively, according to the case where a specific BWP is activated in cell 18-06 based on a previous different high-level signal or L1 signal. BWP 18-02 and 18-08 may be configured to have the same subcarrier spacing based on the previous high-level signal, and BWP 18-02 and 18-10 may be configured to have different subcarrier spacings according to the previous high-level signal.

[0288] When the data information scheduled according to the control information is sent and received in BWP 18-08 (18-12), the UE may determine to adopt Method 17-1; and when the data information scheduled according to the control information is sent and received in BWP 18-18 (18-14), the UE may determine to adopt Method 17-2.

[0289] For example, when the subcarrier spacing of BWP 18-02 and 18-08 is 15 kHz and the subcarrier spacing of BWP 18-04 and 18-10 is 30 kHz, when performing cross-carrier scheduling (18-12) from BWP 18-02 to BWP 18-08 and performing cross-carrier scheduling (18-18) from BWP 18-04 to BWP 18-10, the UE determines to adopt the above method 17-1; when performing cross-carrier scheduling (18-14) from BWP 18-02 to BWP 18-10 and performing cross-carrier scheduling (18-16) from BWP 18-04 to BWP 18-08, the UE may determine to adopt method 17-2.

[0290] In Figure 18 even when multiple BWPs are configured in a cell according to a high-level signal, only one (or more) BWP is activated, and the UE can transmit and receive control information or data information with the base station only through the activated BWP.

[0291] In addition, according to an embodiment of the present disclosure, a method of adopting method 17-1 or method 17-2 according to whether the subcarrier spacing of the BWP for transmitting and receiving control information and data information is the same in the case of cross-carrier scheduling is described. Method 17-1 or method 17-2 can be adopted in the same manner according to whether the cyclic prefixes are the same, and a method considering whether both the cyclic prefix and the subcarrier spacing are the same can also be adopted.

[0292] Alternatively, in addition to methods 17-1 and 17-2, the UE can receive data information from the base station through the following methods 18-1 and 18-2 regardless of cross-carrier scheduling.

[0293] Information about the time slot to which the PDSCH is assigned is where n can be the time slot for transmitting and receiving scheduling DCI. K0 can represent a value determined based on the subcarrier spacing information of the PDSCH, and μ PDSCH and μ PDCCH can respectively represent the configuration information of the subcarrier spacing of the PDSCH and the PDCCH. The time slot k is The case where the subcarrier spacings of the PDCCH and the PDSCH are different from each other may include: the case where the PDCCH and the PDSCH are transmitted and received in different cells or carriers and the subcarrier spacings configured in the cells or carriers are different from each other; or the case where although the PDCCH and the PDSCH are in the same cell or carrier, but both have different BWPs (frequency BWPs) and the BWPs are configured with different subcarrier spacings. For 15 kHz, μ PDSCH and μ PDCCH are 0; for 30 kHz, μ PDSCH and μPDCCH The value is 1; for 60 kHz, μ PDSCH and μ PDCCH The value is 2; and for 120 kHz, μ PDSCH and μ PDCCH The value is 3.

[0294] The starting symbol S can be determined by the following two methods.

[0295] - Method 18-1: When the UE receives a high-level signal indicating a change in the reference time point of the starting symbol S to which the PDSCH is assigned, and receives a PDSCH scheduled by a DCI format including a CRC scrambled to a C-RNTI, MCS-RNTI, or CS-RNTI having a PDSCH mapping type B and a K0 value of 0, and when the PDCCH and PDSCH subcarrier spacings (or cyclic prefixes) are the same, the first symbol S0 of the PDCCH monitoring time point (or PDCCH resource or CORESET) when the DCI format is detected at the starting symbol S can be determined as a reference.

[0296] - Method 18-2: In all cases other than those described in Method 18-1, the UE can determine the starting symbol S based on the first symbol S0 (S0 = 0) in the time slot in which the PDSCH is scheduled.

[0297] Figure 15 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0298] Reference Figure 15 , the UE may include a transmission and reception unit (transceiver) 15-00, a memory 15-05, and a processor 15-10. The transmission and reception unit 15-00 and the processor 15-10 of the UE may operate according to the above-described communication method of the UE. However, the constituent elements of the UE are not limited to the above examples. For example, the UE may include more or fewer constituent elements than those described above. In addition, the transmission and reception unit 15-00, the memory 15-05, and the processor 15-10 may be implemented in the form of a single chip.

[0299] The transmission and reception unit 15-00 may transmit and receive signals to and from a base station. The signals may include control information and data. To this end, the transmission and reception unit 15-00 may include an RF transmitter for up-converting and amplifying the signal to be transmitted, and an RF receiver for low-noise amplifying and down-converting the received signal. However, this is only an embodiment of the transmission and reception unit 15-00, and the constituent elements of the transmission and reception unit 15-00 are not limited to the RF transmitter and the RF receiver.

[0300] In addition, the transmitting and receiving unit 15-00 may receive signals through a wireless channel and output the received signals to the processor 15-10, and transmit the signals output from the processor 15-10 through the wireless channel.

[0301] The memory 15-05 may store programs and data required for UE operations. In addition, the memory 15-05 may store control information or data included in signals transmitted or received by the UE. The memory 15-05 may include storage media such as read-only memory (ROM), random access memory (RAM), hard disk, compact disk-ROM (CD-ROM), digital versatile disk (DVD), etc., or a combination of storage media. In addition, the memory 15-05 may include multiple memories.

[0302] In addition, the processor 15-10 may control a series of processes so that the UE operates according to the above-described embodiments. For example, the processor 15-10 may control the constituent elements of the UE to receive DCI including two layers, thereby receiving multiple PDSCHs simultaneously. The processor 15-10 may include multiple processors, and the processor 15-10 may perform control operations on the UE constituent elements by executing programs stored in the memory 15-05.

[0303] Figure 16 The structure of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0304] Reference Figure 16 , the base station may include a transmitting and receiving unit (transceiver) 16-00, a memory 16-05, and a processor 16-10. The transmitting and receiving unit 16-00 and the processor 16-10 of the base station may operate according to the above-described communication method of the base station. However, the constituent elements of the base station are not limited to the above examples. For example, the base station may include more or fewer constituent elements than those described above. In addition, the transmitting and receiving unit 16-00, the memory 16-05, and the processor 16-10 may be implemented in the form of a single chip.

[0305] The transmitting and receiving unit 16-00 may transmit and receive signals with the UE. The signals may include control information and data. To this end, the transmitting and receiving unit 16-00 may include an RF transmitter for up-converting and amplifying the signal to be transmitted, and an RF receiver for low-noise amplifying and down-converting the received signal. However, this is only an embodiment of the transmitting and receiving unit 16-00, and the constituent elements of the transmitting and receiving unit 16-00 are not limited to the RF transmitter and the RF receiver.

[0306] In addition, the transmitting and receiving unit 16-00 can receive signals through a wireless channel and output the received signals to the processor 16-10, and transmit the signals output from the processor 16-10 through the wireless channel.

[0307] The memory 16-05 can store programs and data required for the operation of the base station. In addition, the memory 16-05 can store control information or data included in signals transmitted or received by the base station. The memory 16-05 can include storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. In addition, the memory 16-05 can include a plurality of memories.

[0308] In addition, the processor 16-10 can control a series of processes so that the base station operates according to the above-described embodiments. For example, the processor 16-10 can control each component element of the base station to configure DCI of two layers including allocation information related to a plurality of PDSCHs and transmit the DCI. The processor 16-10 can include a plurality of processors, and the processor 16-10 can execute control operations of the base station components by executing programs stored in the memory 16-05.

[0309] The method according to the embodiments described in the claims or the specification of the present disclosure can be implemented in the form of hardware, software, or a combination of hardware and software.

[0310] When implemented by software, a computer-readable storage medium for storing one or more programs (software modules) can be provided. One or more programs stored in the computer-readable storage medium can be configured to be executed by one or more processors in an electronic device (apparatus). One or more programs can include instructions for the electronic device to execute the method according to the embodiments described in the claims or the specification of the present disclosure.

[0311] The program (software module, software) can be stored in RAM, non-volatile memory (including flash memory, ROM, electrically erasable programmable ROM (EEPROM), magnetic disk storage device, CD-ROM, DVD, or different forms of optical storage device, tape cassette, etc.). Alternatively, the program can be stored in a memory configured by a combination of some or all memories. In addition, each component memory can include a plurality of memories.

[0312] In addition, the program can be stored in an attachable storage device accessible via a communication network (such as the Internet, intranet, local area network (LAN), wide area network (WLAN), or storage area network (SAN), or a combination thereof). The storage device can access the device implementing the embodiments of the present disclosure via an external port. In addition, an independent storage device on the communication network can access the device implementing the embodiments of the present disclosure.

[0313] According to the present disclosure, in a wireless communication system, a base station can provide efficient data transmission to a UE.

[0314] In the specific embodiments disclosed above, the constituent elements included in the present disclosure are expressed as singular or plural according to specific embodiments. However, the singular or plural expression is appropriately selected for the presented situation for ease of explanation, and the present disclosure is not limited to singular or plural constituent elements. Even constituent elements expressed in the plural form can be composed of a single constituent element, or constituent elements expressed in the singular form can be composed of multiple constituent elements.

[0315] The embodiments of the present disclosure disclosed in this specification and the drawings are only specific examples, solely for facilitating the explanation of the technical content of the present disclosure and helping to understand the present disclosure, and do not mean to limit the scope of the present disclosure. In other words, it will be obvious to those skilled in the art to which the present disclosure pertains that different modified examples can be implemented based on the technical idea of the present disclosure. In addition, the various embodiments can be combined with each other as needed. For example, a part of one embodiment of the present disclosure can be combined with a part of another embodiment to operate the base station and the UE. For example, a part of the first embodiment and a part of the second embodiment of the present disclosure can be combined with each other to operate the base station and the UE. In addition, although the embodiments are provided based on the FDD LTE system, other modified examples based on the technical concept of the present disclosure can be implemented based on other systems such as the TDD LTE system, 5G, or NR system.

Claims

1. A data communication method for a user equipment, the data communication method comprising: Receive a higher layer signal indicating a change in the reference point of the starting symbol to which the physical downlink shared channel (PDSCH) is assigned; Detect, from a physical downlink control channel (PDCCH), a format of downlink control information (DCI) including PDSCH scheduling information, the DCI including a cyclic redundancy check (CRC) scrambled with one of a cell radio network temporary identifier (C-RNTI), a modulation and coding scheme cell (MCS-RNTI), and a configured scheduling (CS-RNTI); and Determine the starting symbol to which the PDSCH is assigned based on information about the format of the DCI, mapping type information of the PDSCH, and an offset value between the time slot in which the PDCCH is located and the time slot in which the PDSCH is located.

2. The data communication method according to claim 1, wherein, Determining the starting symbol to which the PDSCH is assigned includes: When the mapping type of the PDSCH is mapping type B and the offset value is 0, determine the starting symbol to which the PDSCH is assigned based on the first symbol at the monitoring point where the format of the DCI is detected in the PDCCH.

3. The data communication method according to claim 2, wherein, Determining the starting symbol to which the PDSCH is assigned includes: When the subcarrier spacing of the PDCCH is the same as that of the PDSCH, determine the starting symbol to which the PDSCH is assigned based on the first symbol at the monitoring point where the format of the DCI is detected in the PDCCH.

4. The data communication method according to claim 3, wherein, Determining the starting symbol to which the PDSCH is assigned includes: When the cyclic prefix of the PDCCH is the same as that of the PDSCH, determine the starting symbol to which the PDSCH is assigned based on the first symbol at the monitoring point where the format of the DCI is detected in the PDCCH.

5. The data communication method according to claim 1, wherein, Determining the starting symbol to which the PDSCH is assigned includes: When the mapping type of the PDSCH is not type B and the offset value is not 0, determine the starting symbol to which the PDSCH is assigned based on the first symbol in the time slot in which the PDSCH is scheduled.

6. The data communication method according to claim 1, wherein, Determining the starting symbol to which the PDSCH is assigned includes: When cross-carrier scheduling of the PDCCH and the PDSCH is configured, determine the starting symbol to which the PDSCH is assigned based on the first symbol in the time slot in which the PDSCH is scheduled.

7. The data communication method according to claim 1, wherein, When a higher layer signal indicating a change in the reference point of the starting symbol to which the PDSCH is assigned is not received, determining the starting symbol to which the PDSCH is assigned includes: Determine the starting symbol to which the PDSCH is assigned based on the first symbol in the time slot in which the PDSCH is scheduled.

8. A data communication method for a base station, the data communication method comprising: Send a higher layer signal indicating a change in the reference point of the starting symbol to which the physical downlink shared channel (PDSCH) is assigned; And Downlink control information DCI including PDSCH scheduling information is provided through a physical downlink control channel PDCCH, and the DCI includes a cyclic redundancy check CRC scrambled to one of a cell radio network temporary identifier C-RNTI, a modulation and coding scheme cell MCS-RNTI, and a configured scheduling CS-RNTI. Wherein, based on information about the format of the DCI, mapping type information of the PDSCH, and an offset value between the time slot where the PDCCH is located and the time slot where the PDSCH is located, the starting symbol to which the PDSCH is assigned is determined.

9. The data communication method according to claim 8, wherein, When the mapping type of the PDSCH is mapping type B, the offset value is 0, and the subcarrier spacing of the PDCCH is the same as that of the PDSCH, based on the first symbol at the monitoring point where the format of the DCI is detected in the PDCCH, the starting symbol to which the PDSCH is assigned is determined.

10. The data communication method according to claim 8, wherein, When cross-carrier scheduling between the PDCCH and the PDSCH is configured, or the subcarrier spacings of the PDCCH and the PDSCH are different from each other, based on the first symbol in the time slot where the PDSCH is scheduled, the starting symbol to which the PDSCH is assigned is determined.

11. A user equipment for performing a data communication method, the user equipment comprising: A transceiver; And A processor, coupled to the transceiver and configured to: Receive a high-layer signal indicating a change in the reference point of the starting symbol to which a physical downlink shared channel PDSCH is assigned; Detect the format of downlink control information DCI including PDSCH scheduling information from a physical downlink control channel PDCCH, where the DCI includes a cyclic redundancy check CRC scrambled to one of a cell radio network temporary identifier C-RNTI, a modulation and coding scheme cell MCS-RNTI, and a configured scheduling CS-RNTI; and Based on information about the format of the DCI, mapping type information of the PDSCH, and an offset value between the time slot where the PDCCH is located and the time slot where the PDSCH is located, determine the starting symbol to which the PDSCH is assigned.

12. The user equipment according to claim 11, wherein,The processor is further configured to: When the mapping type of the PDSCH is mapping type B and the offset value is 0, based on the first symbol at the monitoring point where the DCI format is detected in the PDCCH, determine the starting symbol to which the PDSCH is assigned.

13. The user equipment according to claim 12, wherein, The processor is further configured to: When the subcarrier spacing of the PDCCH is the same as that of the PDSCH, based on the first symbol at the monitoring point where the format of the DCI is detected in the PDCCH, determine the starting symbol to which the PDSCH is assigned.

14. The user equipment according to claim 13, wherein, The processor is further configured to: When the cyclic prefix of the PDCCH is the same as that of the PDSCH, based on the first symbol at the monitoring point where the format of the DCI is detected in the PDCCH, determine the starting symbol to which the PDSCH is assigned.

15. A base station for performing a data communication method, the base station comprising: A transceiver; And A processor, coupled to the transceiver and configured to: Transmit a high-layer signal, where the high-layer signal indicates a change in the reference point of the starting symbol to which the physical downlink shared channel (PDSCH) is allocated; and Provide downlink control information (DCI) including PDSCH scheduling information through a physical downlink control channel (PDCCH), where the DCI includes a cyclic redundancy check (CRC) scrambled to one of a cell radio network temporary identifier (C-RNTI), a modulation and coding scheme cell (MCS-RNTI), and a configured scheduling (CS-RNTI); wherein, based on information about the format of the DCI, mapping type information of the PDSCH, and an offset value between the time slot in which the PDCCH is located and the time slot in which the PDSCH is located, the starting symbol to which the PDSCH is allocated is determined.

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