Method and apparatus for determining transmission resources of an uplink channel for dual connectivity in a wireless communication system

Abstract

The present disclosure relates to a communication method and system for integrating a fifth generation (5G) communication system and Internet of Things (IoT) technology that supports higher data rates beyond the fourth generation (4G) system. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected cars, healthcare, digital education, smart retail, safety and security services. A method performed by a terminal in a wireless communication system is provided. The method includes receiving a higher signal including multiple physical uplink control channel (PUCCH) resource information, determining a PUCCH format and resource for hybrid automatic repeat request (HARQ) feedback information corresponding to a physical downlink shared channel (PDSCH), and sending HARQ feedback information based on the determined PUCCH format and resource.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for determining resources for dual connectivity in a wireless communication system. More particularly, the present disclosure relates to a method and apparatus for transmitting an uplink channel for dual connectivity in a wireless communication system. Background Art

[0002] In order to meet the increased demand for wireless data traffic since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (mmWave) bands (e.g., 60 GHz bands) to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multipoint (CoMP), receiver interference cancellation, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet, a human-centric network of connected devices where humans generate and consume information, is evolving into the Internet of Things (IoT), where distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE), a combination of IoT technology and big data processing technology connected to cloud servers, has emerged. Because IoT implementation requires technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, recent research has focused on sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC). This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated between connected things. The IoT can be applied to a variety of fields, including smart homes, smart buildings, smart cities, smart cars (connected vehicles), smart grids, healthcare, smart appliances, and advanced medical services, by integrating and combining existing information technology (IT) with various industrial applications.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-type communications (MTC), and machine-to-machine (M2M) communications can be implemented using beamforming, MIMO, and array antennas. Cloud radio access networks, as an application of the aforementioned big data processing technologies, can also be considered an example of the convergence of 5G and IoT technologies.

[0005] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, 5G communication technologies such as sensor networks, machine-to-machine communication (M2M), and machine-type communication (MTC) are implemented using technologies such as beamforming, MIMO, and array antennas. The application of cloud radio access networks (cloud RAN), which is a big data processing technology mentioned above, is an example of the integration of 5G and IoT technologies.

[0006] Meanwhile, various studies have been conducted on methods for transmitting uplink control channels in communication systems. Specifically, methods for transmitting a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH) have been discussed from various perspectives.

[0007] The above information is presented as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the Invention

[0008]

Technical Issues

[0009] A user equipment (UE) capable of performing dual connectivity of Long Term Evolution (LTE) and New Radio (NR) may transmit data to or receive data from an LTE cell and an NR cell, respectively.

[0010] Various aspects of the present disclosure are intended to address at least the above-mentioned problems and / or disadvantages, and to provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a method and apparatus that enables a UE with dynamic power sharing capability for uplink transmission to determine which uplink transmission will be prioritized when LTE uplink transmission and NR uplink transmission conflict with each other in time, although the UE's LTE uplink transmission and NR uplink transmission are not limited to specific subframes or time slots. A UE with semi-static power sharing capability for uplink transmission performs LTE uplink transmission and NR uplink transmission in a time division method. At this time, the UE can receive a first configuration that enables uplink transmission to be performed only in a specific subframe for an LTE cell, and according to the first configuration, a hybrid automatic repeat request acknowledgement (HARQ-ACK) for downlink data is limited to being sent only in a specific subframe. If a UE with semi-static power sharing capability sends uplink data, the positions of the subframes in which initial transmission and retransmission are performed may be the same or different for each radio frame according to the time division duplex (TDD) uplink-downlink (UL-DL) configuration of the LTE cell. Therefore, by applying another second configuration according to the TDD UL-DL configuration of the LTE cell, a method and apparatus are provided for performing initial transmission and retransmission of LTE uplink data only in a restricted specific subframe according to the first configuration. In addition, if the UE receives only a physical downlink shared channel (PDSCH) through one physical downlink control channel (PDCCH) in the LTE primary cell, only one PDCCH for DL semi-persistent scheduling (SPS) release, or only one PDSCH without a corresponding PDCCH, a method and apparatus are provided for determining multiple PUCCH transmission resources of physical uplink control channel (PUCCH) formats 3 / 4 / 5.

[0011] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0012] [Solution to the problem]

[0013] According to one aspect of the present disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes: receiving a higher signal including PUCCH resource information; determining a PUCCH format and resource for hybrid automatic repeat request (HARQ) feedback information corresponding to a PDSCH; and sending HARQ feedback information based on the determined PUCCH format and resource, wherein the PUCCH format uses a preset format and the resource corresponds to the first PUCCH resource among multiple PUCCH resource information, if an evolved universal mobile telecommunications system (UMTS) terrestrial radio access (EUTRA) new radio (NR)-dual connectivity (EN-DC) is set in the terminal, a time division duplex (TDD) frame structure is set in a primary cell (PCell) of the terminal, reference TDD configuration information is set in the terminal, and a downlink assignment index (DAI) field value of a DCI format corresponding to the PDSCH is set to 1.

[0014] According to another aspect of the present disclosure, a method performed by a base station in a wireless communication system is provided. The method includes: sending a higher signal including multiple PUCCH resource information to a terminal; sending a PDSCH to the terminal; and receiving HARQ feedback information corresponding to the PDSCH from the terminal based on the PUCCH format and resource, wherein the PUCCH format uses a preset format, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resource information, if the evolved UMTS EUTRA NR-EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the DCI format corresponding to the PDSCH is set to 1.

[0015] According to another aspect of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver and a controller, the controller being configured to receive a higher signal including PUCCH resource information via the transceiver, determine a PUCCH format and resource for HARQ feedback information corresponding to a PDSCH, and send the HARQ feedback information via the transceiver based on the determined PUCCH format and resource, wherein the PUCCH format uses a preset format and the resource corresponds to a first PUCCH resource among multiple PUCCH resource information, if the evolved UMTS EUTRA NR-EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the DCI format corresponding to the PDSCH is set to 1.

[0016] According to another aspect of the present disclosure, a base station in a wireless communication system is provided. The method includes a transceiver and a controller, the controller being configured to send a higher signal including multiple PUCCH resource information to a terminal via the transceiver, send a PDSCH to the terminal via the transceiver, and receive HARQ feedback information corresponding to the PDSCH from the terminal based on the PUCCH format and resource via the transceiver, wherein the PUCCH format uses a preset format and the resource corresponds to the first PUCCH resource among the multiple PUCCH resource information, if the evolved UMTS EUTRA NR-EN-DC is set in the terminal, the TDD frame structure is set in the primary cell (PCell) of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the DCI format corresponding to the PDSCH is set to 1.

[0017] [Beneficial effects of the invention]

[0018] According to another aspect of the present disclosure, a method and apparatus for determining resources for dual connectivity in a wireless communication system may be provided. In addition, according to an embodiment of the present disclosure, a method and apparatus for transmitting an uplink channel for a dual-connected UE in a wireless communication system may be provided.

[0019] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 The basic structure of the time-frequency domain in the Long Term Evolution (LTE) system according to an embodiment of the present disclosure is shown;

[0022] Figure 2 The operation of a subframe in an LTE time division duplex (TDD) frame according to an embodiment of the present disclosure is shown;

[0023] Figure 3 The operation of a subframe in an LTE TDD frame according to an embodiment of the present disclosure is shown;

[0024] Figure 4 An operation in which fifth generation (5G) services are multiplexed in one system and transmitted according to an embodiment of the present disclosure is shown;

[0025] Figure 5 A communication system configuration to which the present disclosure is applied according to an embodiment of the present disclosure is shown;

[0026] Figure 6 NR uplink transmission and LTE uplink transmission according to an embodiment of the present disclosure are shown;

[0027] Figure 7 shows uplink transmission according to embodiment 1 according to an embodiment of the present disclosure;

[0028] Figure 8 shows uplink transmission according to embodiment 2 according to an embodiment of the present disclosure;

[0029] Figure 9A shows a base station process according to an embodiment of the present disclosure;

[0030] Figure 9B shows a user equipment (UE) process according to various embodiments of the present disclosure;

[0031] Figure 10 The present invention provides a method for solving the problem of Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (EUTRA) New Radio (NR)-Dual Connectivity (EN-DC) UE to or from a cell with a specific configuration according to an embodiment of the present invention. Figure 5 Concerns regarding base stations sending or receiving data as described in;

[0032] Figure 11 A base station according to an embodiment of the present disclosure is shown; and

[0033] Figure 12 A UE according to an embodiment of the present disclosure is shown.

[0034] The same reference numerals are used throughout the drawings to denote the same elements. DETAILED DESCRIPTION

[0035] The following description, with reference to the accompanying drawings, is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these are to be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. Furthermore, descriptions of well-known functions and configurations may be omitted for clarity and conciseness.

[0036] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0037] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0038] Here, it should be understood that each block in the flowchart illustration, as well as the combination of blocks in the flowchart illustration, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions specified in the (multiple) flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can direct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means for implementing the functions specified in the (multiple) flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operations to be performed on the computer or other programmable data processing device, thereby producing a computer-implemented process, such that the instructions executed on the computer or other programmable data processing device provide operations for implementing the functions specified in the (multiple) flowchart blocks.

[0039] Each block of the flowchart diagram may represent a module, code segment, or code portion that includes one or more executable instructions for implementing (a plurality of) specified logical functions. It should also be noted that in some alternative embodiments, the functions mentioned in the blocks may not occur in the order shown. For example, depending on the functions involved, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in the reverse order.

[0040] As used herein, the term "unit" refers to a software element or a hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, a "unit" does not always have the implication of being limited to software or hardware. A "unit" can be constructed to be stored in an addressable storage medium or to be executed on one or more processors. Therefore, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by a "unit" can be combined into fewer elements or "units", or can be divided into more elements or "units". In addition, elements and "units" can be implemented as reproducing one or more CPUs in a device or a secure multimedia card.

[0041] Hereinafter, embodiments will be described with reference to the accompanying drawings. When describing the following disclosure, if it is determined that its detailed description will unnecessarily obscure the subject matter of the present disclosure, the detailed description of the relevant known configurations or functions incorporated herein will be omitted. The terms used below are defined based on the functions in the present disclosure and may vary depending on the intention or habits of the user or operator. Therefore, the definition of terms should be based on the content of the entire specification.

[0042] In addition, when describing the embodiments, the present disclosure will be directed to a wireless communication system based on orthogonal frequency division multiplexing (OFDM), especially the Third Generation Partnership Project (3GPP) Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (EUTRA) standard, but those skilled in the art will understand that the main points of the present disclosure can also be applied to other communication systems with similar technical backgrounds and channel formats, with slight modifications, without basically departing from the scope of the present disclosure.

[0043] Meanwhile, in mobile communication systems, research on the coexistence of new fifth generation (5G) communication (or new radio (NR) communication in the present disclosure) and existing long term evolution (LTE) communication in the same spectrum is underway.

[0044] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting data to or receiving data from each communication system by a terminal, wherein different wireless communication systems coexist on one carrier frequency or multiple carrier frequencies, and data transmission or reception can be performed in at least one communication system among the different communication systems.

[0045] Traditionally, mobile communication systems have been developed to provide voice services while ensuring user mobility. However, mobile communication systems are gradually expanding from voice to include data services and have now advanced to provide high-speed data services. However, current mobile communication systems face a simultaneous shortage of resources and user demand for high-speed services, creating a need for more advanced mobile communication systems.

[0046] As a next-generation mobile communication system developed in response to this demand, the 3GPP is currently developing the LTE standard. LTE is a technology that implements high-speed packet-based communication with a transmission rate of up to 100 Mbps. To this end, various approaches are being considered, such as reducing the number of nodes on the communication path by simplifying the network structure and aligning the wireless protocol as closely as possible with the wireless channel.

[0047] The LTE system uses a hybrid automatic repeat request (HARQ) method, in which if a decoding failure occurs during initial transmission, the corresponding data is retransmitted at the physical layer. In the HARQ method, if the receiver fails to correctly decode the data, it sends information indicating the decoding failure (a negative acknowledgement: NACK) to the transmitter, allowing the transmitter to retransmit the corresponding data at the physical layer. The receiver combines the data retransmitted by the transmitter with the existing data that failed to be decoded, thereby improving data reception performance. Furthermore, if the data is successfully decoded, the receiver can send information indicating the decoding success (an acknowledgment (ACK)) to the transmitter, allowing the transmitter to send new data.

[0048] Figure 1 The basic structure of the time-frequency domain according to an embodiment of the present disclosure is shown. The time-frequency domain is a radio resource domain for transmitting data or control channels in the downlink of the LTE system.

[0049] refer to Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The smallest transmission unit in the time domain is the OFDM symbol, and N symb OFDM symbols 102 configure one slot 106, and two slots configure one subframe 105. The length of a slot is 0.5 ms, and the length of a subframe is 1.0 ms. A radio frame 114 is a time domain unit configured by 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the total system transmission bandwidth consists of a total of N BW 104 subcarriers are configured.

[0050] The basic unit of the time-frequency domain is a resource element (RE) 112, and RE can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB or physical resource block (PRB)) 108 is represented by N in the time domain. symb consecutive OFDM symbols 102 and N in the frequency domain RB Thus, one RB 108 is defined by N consecutive subcarriers 110. symb x N RB 112 REs are configured. Usually, the minimum transmission unit of data is RB. In LTE system, N symb is 7, N RB is 12, N BW and N RBGenerally proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled to the UE. The LTE system defines and operates six transmission bandwidths. In the case of an FDD system in which the downlink and uplink are classified by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth can be different from each other. The channel bandwidth represents the RF bandwidth and corresponds to the system transmission bandwidth. Table 1 shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth includes a transmission bandwidth of 50 RBs.

[0051] [Table 1]

[0052]

[0053] Downlink control information is transmitted within the first N OFDM symbols in a subframe. Typically, N = {1, 2, 3}. Therefore, the value of N varies with each subframe, depending on the amount of control information to be transmitted in the current subframe. Control information includes a control channel transmission interval indicator indicating the number of OFDM symbols over which control information is transmitted, scheduling information for downlink or uplink data, and HARQ ACK / NACK signals.

[0054] In the LTE system, scheduling information for downlink data or uplink data is sent from the base station to the UE via downlink control information (DCI). Uplink (UL) refers to the radio link through which the UE sends data or control signals to the base station, while downlink (DL) refers to the radio link through which the base station sends data or control signals to the terminal. DCI is defined as various formats, and the DCI format can be determined and applied to the operation based on whether the scheduling information is for uplink data (UL grant) or for downlink data (DL grant), whether the DCI is a compact DCI with a small amount of control information, whether spatial multiplexing using multiple antennas is applied, whether the DCI is a DCI for power control, etc. For example, DCI format 1 corresponding to scheduling control information (DL grant) about downlink data can be configured to include at least the following control information.

[0055] - Resource Allocation Type 0 / 1 Flag: Indicates whether the resource allocation method is Type 0 or Type 1. Type 0 allocates resources in units of resource block groups (RBGs) by applying a bitmap method. In LTE systems, the basic unit of scheduling is a resource block (RB), which is represented by time and frequency domain resources. An RBG is configured as multiple RBs and is used as the basic unit of scheduling in the Type 0 method. Type 1 allows allocation of specific RBs within an RBG.

[0056] - Resource Block Allocation: Indicates the RBs allocated for data transmission. The resources to be indicated are determined according to the system bandwidth and resource allocation method.

[0057] - Modulation and Coding Scheme (MCS): indicates a modulation method used for data transmission and the size of a transport block as data to be transmitted.

[0058] -HARQ process number: indicates the HARQ process number.

[0059] - New data indicator: indicates HARQ initial transmission or retransmission.

[0060] - Redundancy version: indicates the redundancy version of HARQ.

[0061] - Transmission Power Control (TCP) Command for Physical Uplink Control Channel (PUCCH): indicates a transmission power control command for PUCCH which is an uplink control channel.

[0062] The DCI is transmitted via the PDCCH or enhanced PDCCH (EPDCCH) through a channel coding and modulation process.

[0063] Typically, for each UE, DCI is independently channel-coded and then configured and transmitted as a separate PDCCH. The PDCCH is mapped and transmitted during the control channel transmission interval in the time domain. The frequency domain location to which the PDCCH is mapped is determined by the identifier (ID) of each UE and is spread across (distributed) the entire system transmission band.

[0064] Downlink data is transmitted via the Physical Downlink Shared Channel (PDSCH), a physical channel used for downlink data transmission. The PDSCH is transmitted after the control channel transmission interval. Scheduling information (such as specific mapping position in the frequency domain and modulation method) is indicated by the DCI transmitted via the PDCCH.

[0065] The base station notifies the UE of the modulation method applied to the PDSCH and the size of the data to be transmitted (transport block size (TBS)) via the MCS configured by 5-bit control information included in the DCI. The TBS corresponds to the size before channel coding for error correction is applied to the data to be transmitted (transport block, TB) by the base station.

[0066] The modulation methods supported by the LTE system are Quadrature Phase Shift Keying (QPSK), 16-QAM and 64QAM. m ) correspond to 2, 4, and 6, respectively. For example, in the case of QPSK modulation, 2 bits are transmitted per symbol. In the case of 16QAM modulation, 4 bits are transmitted per symbol. In the case of 64QAM modulation, 6 bits are transmitted per symbol.

[0067] Unlike LTE Rel-8, 3GPP LTE Rel-10 adopts bandwidth extension technology to support a larger number of transmissions. Compared to LTE Rel-8 terminals that transmit data in one frequency band, a technology called bandwidth extension or carrier aggregation (CA) can extend the frequency band, thereby increasing the amount of data transmission through the extended frequency band. Each frequency band is called a component carrier (CC), and an LTE Rel-8 terminal is defined as having one component carrier for each of the downlink and uplink. In addition, a group of uplink component carriers connected to a downlink component carrier through SIB-2 is called a cell. The SIB-2 connection relationship between the downlink component carrier and the uplink component carrier is transmitted through a system signal or a high-layer signal. A terminal that supports CA can receive downlink data and send uplink data through multiple serving cells.

[0068] In LTE Rel-10, if it is difficult for the base station to transmit the physical downlink control channel (PDCCH) to a specific UE in a specific serving cell, the base station can transmit the PDCCH in another serving cell and configure the carrier indicator field (CIF) as a field indicating that the corresponding PDCCH is the physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH) of another serving cell. CIF can be configured in terminals that support CA. The CIF can be determined to indicate another serving cell by adding 3 bits to the PDCCH information in a specific serving cell, and the CIF is included only when the higher layer signal is configured to perform cross-carrier scheduling. If the higher layer signal is not configured to perform cross-carrier scheduling, but is configured to perform self-scheduling, the CIF is not included, in which case cross-carrier scheduling is not performed. If the CIF is included in the downlink allocation information (DL allocation), the CIF is defined as indicating the serving cell to which the PDSCH to be scheduled by the DL allocation is transmitted. If the CIF is included in uplink resource allocation information (UL grant), the CIF is defined to indicate a serving cell to which a PUSCH scheduled by the UL grant is transmitted.

[0069] As mentioned above, in LTE Rel-10, carrier aggregation (CA) is defined as a bandwidth extension technology, so that multiple serving cells can be configured in the UE. The UE periodically or aperiodically transmits channel information about multiple serving cells to the base station in order to perform data scheduling of the base station. The base station schedules and transmits data for each carrier, and the terminal transmits A / N feedback for the data transmitted for each carrier. LTE Rel-10 is designed to transmit A / N feedback of a maximum of 21 bits, and if the transmission of A / N feedback and the transmission of channel information overlap in one subframe, LTE Rel-10 is designed to transmit A / N feedback and discard the channel information. LTE Rel-11 is designed to multiplex the A / N feedback and channel information of one cell, and transmit the A / N feedback and channel information corresponding to a maximum of 22 bits for one cell in the transmission resources of PUCCH format 3 via PUCCH format 3.

[0070] In LTE Rel-13, a maximum of 32 serving cells configuration scenario is assumed. LTE-Rel 13 conceptually includes extending the number of serving cells to a maximum of 32 serving cells, not only through licensed bands but also through unlicensed bands. In addition, LTE Rel-13 includes providing LTE services in unlicensed bands (such as 5GHz bands) based on the number restrictions of licensed bands (such as LTE frequencies), which is called licensed assisted access (LAA). LAA applies LTE's carrier aggregation technology to support the operation of LTE cells (corresponding to licensed cells) as primary cells (PCells) and LAA cells (corresponding to unlicensed bands) as secondary cells (SCells). Therefore, as in LTE, feedback generated in the LAA cell corresponding to the SCell should only be sent in the PCell, and the LAA cell can freely apply downlink subframes and uplink subframes. Unless otherwise specified in this specification, LTE refers to all technologies evolved from LTE, such as LTE-A and LAA.

[0071] Typically, a TDD communication system uses a common frequency for downlink and uplink, but separates the transmission and reception of uplink and downlink signals in the time domain. In LTE TDD, uplink or downlink signals are divided and transmitted for each subframe. The subframes used for uplink and downlink can be equally divided and operated in the time domain according to the traffic load of the uplink and downlink, with more subframes being allocated to downlink and operation, or more subframes being allocated to uplink and operation. In LTE, the length of a subframe is 1ms, and 10 subframes are aggregated to form a radio frame.

[0072] [Table 2]

[0073]

[0074] Table 2 shows the TDD uplink-downlink (UL-DL) configuration defined in LTE. In Table 1, "D" represents a subframe configured for downlink transmission, "U" represents a subframe configured for uplink transmission, and "S" represents a special subframe configured by a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS). In DwPTS, control information can be sent to the downlink, as in a general subframe. If the length of DwPTS is long enough according to the configuration status of the special subframe, downlink data transmission is also possible. GP is a period for accepting the transmission state transition from downlink to uplink, and the length of GP is determined according to the network configuration, etc. UpPTS is used for the sounding reference signal (SRS) transmission of the UE required for estimating the uplink channel state, or the random access channel (RACH) transmission of the UE for random access.

[0075] For example, in TDD UL-DL configuration #6, downlink data and downlink control information may be transmitted in subframes #0, #5, and #9, and uplink data and uplink control information may be transmitted in subframes #2, #3, #4, #7, and #8. In subframes #1 and #6, which are special subframes, downlink control information and downlink data may be transmitted as appropriate, and SRS or RACH may be transmitted in the uplink.

[0076] In a TDD system, since downlink or uplink signal transmission is allowed only during specific time intervals, it is necessary to define a specific timing relationship between the relevant uplink and downlink physical channels, such as the control channel for data scheduling, the scheduled data channel, and the HARQ ACK / NACK (or HARQ-ACK) channel corresponding to the data channel.

[0077] First, in the LTE TDD system, the uplink / downlink timing relationship between the physical uplink shared channel (PDSCH), which is a physical channel for downlink data transmission, and the corresponding physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH), which is a physical channel through which uplink HARQ ACK / NACK is transmitted, is as follows.

[0078] If the UE receives a PDSCH transmitted to subframe (nk) from the base station, the UE transmits uplink HARQ ACK / NACK for the PDSCH to uplink subframe n. Here, k is an element of set K, and K is defined as shown in Table 3.

[0079] [Table 3]

[0080]

[0081] Table 4 shows the subframes through which corresponding uplink HARQ ACK / NACK is transmitted in the case where PDSCH is transmitted in each downlink subframe (D) or special subframe (S)n in each TDD UL-DL configuration, and is rearranged according to the definition of Table 3.

[0082] [Table 4]

[0083]

[0084] Figure 2 The operation of a subframe in a TDD frame according to an embodiment of the present disclosure is shown.

[0085] refer to Figure 2 , Table 4 shown above refers to the following Figure 2 To describe. Here, Figure 2 It is exemplarily shown that according to the definition of Table 4, in each TDD UL-DL configuration #6 in Table 4, in the case where the PDSCH is transmitted in each downlink subframe or special subframe, a subframe through which the corresponding uplink HARQ ACK / NACK is transmitted.

[0086] For example, an uplink HARQ ACK / NACK corresponding to PDSCH 201 transmitted by the base station in subframe #0 of radio frame i is transmitted by the UE to subframe #7 of radio frame i (indicated by reference numeral 203). At this time, downlink control information (DCI) including scheduling information for PDSCH 201 is transmitted via the PDCCH to the same subframe as the subframe to which the PDSCH is transmitted. As another example, an uplink HARQ ACK / NACK corresponding to PDSCH 205 transmitted by the base station in subframe #9 of radio frame i is transmitted by the UE in subframe #4 of radio frame i+1 (indicated by reference numeral 207). Similarly, downlink control information (DCI) including scheduling information for PDSCH 205 is transmitted via the PDCCH to the same subframe as the subframe to which the PDSCH is transmitted.

[0087] In the LTE system, downlink HARQ adopts an asynchronous HARQ method, in which the data retransmission time is not fixed. For example, if NACK feedback is provided from the UE regarding the HARQ data initially sent by the base station, the base station freely determines the transmission time of the next HARQ data retransmission attempt through a scheduling operation. The UE buffers the HARQ data determined to be erroneous (as a result of decoding the data received for the HARQ operation) and then combines the HARQ data with the subsequently retransmitted HARQ data. At this time, in order to keep the UE's receiving buffer capacity within a predetermined limit, the maximum number of downlink HARQ processes for each TDD UL-DL configuration is defined as shown in Table 5. One HARQ process is mapped to one subframe in the time domain.

[0088] [Table 5]

[0089]

[0090] refer to Figure 2 , the UE decodes PDSCH 201 transmitted by the base station to subframe #0 of radio frame i. If it is determined to be an error, the UE transmits a NACK (indicated by reference numeral 203) to subframe #7 of radio frame i. Upon receiving the NACK, the base station configures the retransmission data for PDSCH 201 as PDSCH 209 and transmits the PDSCH together with the PDCCH. Figure 2 This example illustrates a case where retransmission data is transmitted to subframe #1 of radio frame i+1, considering that the maximum number of downlink HARQ processes of TDD UL-DL configuration #6 is 6 according to the definition in Table 5. For example, there are a total of 6 downlink HARQ processes 211, 212, 213, 214, 215, and 216 between the initial transmission PDSCH 201 and the retransmission PDSCH 209.

[0091] Unlike downlink HARQ in LTE systems, uplink HARQ uses a synchronous HARQ method with fixed data transmission timing. For example, the uplink / downlink timing relationship between the physical uplink shared channel (PUSCH), which is the physical channel used for uplink data transmission, and the physical hybrid indicator channel (PHICH), which is the physical channel through which downlink HARQ ACK / NACK corresponding to the PUSCH is transmitted, is fixed by the following rules.

[0092] When the UE receives the PDCCH including uplink scheduling control information or the PHICH through which downlink HARQ ACK / NACK is transmitted by the base station to subframe n, the UE transmits uplink data corresponding to the control information to subframe (n+k) through the PUSCH. Here, k is defined as in Table 6.

[0093] [Table 6]

[0094]

[0095] In addition, if the UE receives a PHICH transmitting downlink HARQ ACK / NACK to subframe i from the base station, the PHICH corresponds to the PUSCH transmitted by the UE to subframe (ik). Here, k is as defined in Table 7.

[0096] [Table 7]

[0097]

[0098] Figure 3 The operation of a subframe in a TDD frame according to an embodiment of the present disclosure is shown.

[0099] refer to Figure 3 In the case of TDD UL-DL configuration #1, if a PDCCH or a PHICH is transmitted to each downlink or special subframe, the subframe to which the corresponding PUSCH is transmitted and the subframe to which the PHICH corresponding to the PUSCH is transmitted are shown according to the definitions in Tables 6 and 7.

[0100] For example, an uplink PUSCH corresponding to the PDCCH or PHICH 301 transmitted by the base station to subframe #1 of radio frame i is transmitted by the UE from subframe #7 of radio frame i (indicated by reference numeral 303). Furthermore, the base station transmits a PHICH or PDCCH corresponding to the PUSCH to the UE in subframe #1 of radio frame i+1 (indicated by reference numeral 305). As another example, an uplink PUSCH corresponding to the PDCCH or PHICH 307 transmitted by the base station to subframe #6 of radio frame i is transmitted by the UE to subframe #2 of radio frame i+1 (indicated by reference numeral 309). Furthermore, the base station transmits a PHICH or PDCCH corresponding to the PUSCH to the UE in subframe #6 of radio frame i+1 (indicated by reference numeral 311).

[0101] In LTE TDD systems, downlink transmission of PDCCH or PHICH corresponding to PUSCH is restricted to specific downlink subframes related to PUSCH transmission, thereby ensuring minimum transmit / receive processing time for the base station and UE. Figure 3In case of TDD UL-DL configuration #1, in subframes #0 and #5, a PDCCH for scheduling a PUSCH or a PHICH corresponding to the PUSCH is not transmitted to the downlink.

[0102] On the other hand, as a post-LTE communication system, the fifth-generation wireless cellular communication system (hereinafter referred to as "5G" or "NR" in this specification) should be able to freely meet the various needs of users and service providers, thereby supporting services that meet various needs.

[0103] Therefore, 5G can define various 5G services such as enhanced mobile broadband communication (hereinafter, referred to as eMBB in this specification), massive machine type communication (hereinafter, referred to as mMTC in this specification), and ultra-reliable and low-latency communication (hereinafter, referred to as URLLC in this specification) as technologies for meeting requirements selected for 5G services, including a maximum UE transmission rate of 20 Gbps, a maximum UE speed of 500 km / h, a maximum latency time of 0.5 ms, and 1,000,000 UEs / km 2 UE access density requirements.

[0104] For example, to provide eMBB in 5G, from a base station perspective, a maximum downlink UE transmission rate of 20 Gbps and a maximum uplink UE transmission rate of 10 Gbps should be provided. Furthermore, the average transmission rate actually experienced by the UE needs to be increased. To meet these requirements, improvements in transmit / receive technologies are needed, including further improvements in multiple-input, multiple-output transmission technology.

[0105] In addition, in order to support application services (such as those of IoT), mMTC is being considered in 5G. In order to efficiently support IoT services, mMTC needs to meet the requirements of supporting a large number of terminal accesses within a cell, improving UE coverage, extending effective battery life, and reducing UE costs. IoT is attached to various sensors and devices to provide communication functions, so it is necessary to support a large number of UEs within a cell (for example, 1,000,000 UEs / km). 2 In addition, in mMTC, UEs are likely to be located in shadowed areas, such as basements of buildings, or areas not covered by cells due to the nature of the service. Therefore, mMTC requires wider coverage than that provided by eMBB. mMTC is likely to be configured for inexpensive UEs, and frequent battery replacement of such UEs is difficult, thus requiring a long battery life.

[0106] Finally, URLLC is a cellular-based wireless communication for a specific purpose, and corresponds to services for remote control of robots or machine equipment, industrial automation, unmanned aerial vehicles, remote health control, and emergency notifications, and therefore needs to provide ultra-low latency and ultra-reliable communication. For example, URLLC should have a maximum latency of less than 0.5ms and is also required to provide a latency of equal to or less than 10 -5 Therefore, for URLLC, a smaller transmission time interval (TTI) than that of 5G services such as eMBB should be provided. In addition, a design that allocates wide resources in the frequency band is also required.

[0107] The services considered in the fifth generation wireless cellular communication system should be provided as a single framework. For example, in order to effectively manage and control resources, it is preferable to perform control and transmission so that services are integrated into one system rather than operating services independently.

[0108] Figure 4 An operation in which services considered in 5G are transmitted to one system according to an embodiment of the present disclosure is shown.

[0109] refer to Figure 4 , the frequency-time resources 401 used by 5G may include a frequency axis 402 and a time axis 403. Figure 4 An example is shown in which eMBB 405, mMTC 406, and URLLC 407 operate within one framework. In addition, as a service that can be additionally considered in 5G, an enhanced mobile broadcast / multicast service (eMBMS) 408 for providing a cellular-based broadcast service can be considered. Services considered for 5G, such as eMBB 405, mMTC 406, URLLC 407, and eMBMS 408, can be multiplexed within one system frequency bandwidth operating in 5G by time-division multiplexing (TDM) or frequency-division multiplexing (FDM), and space division multiplexing can also be considered. In the case of eMBB 405, it is preferable to occupy as large a frequency bandwidth as possible within a specific time and transmit on the bandwidth in order to provide the increased data transmission rate already described above. Therefore, preferably, the service of eMBB 405 is time-division multiplexed and transmitted with another service within the system transmission bandwidth 401, but it is also preferably that the service of eMBB is frequency-division multiplexed (FDM) and transmitted with other services within the system transmission bandwidth according to the needs of other services.

[0110] Unlike other services, mMTC 406 requires an increased transmission interval to ensure wider coverage, and can ensure coverage by repeatedly transmitting the same packet within the transmission interval. In addition, to reduce the complexity and price of the terminal, the transmission bandwidth within which the terminal can perform reception is limited. Considering the above requirements, mMTC 406 is preferably frequency-division multiplexed (FDM) with other services within the 5G transmission system bandwidth 401.

[0111] Preferably, URLLC 407 has a shorter transmission time interval (TTI) than other services to meet the ultra-low latency requirements of the service. In addition, to meet ultra-reliability requirements, a low coding rate is required, so from a frequency perspective, a wide bandwidth is preferred. Considering the requirements of URLC 407, URLC 407 is preferably time-division multiplexed with other services within the 5G transmission system bandwidth 401.

[0112] The aforementioned services may have different transmission or reception methods and transmission or reception parameters to meet the needs of the services. For example, each service may have a different parameter set (numerology) depending on its needs. The parameter set includes the cyclic prefix (CP) length, subcarrier spacing, OFDM symbol length, and transmission time interval (TTI) in a communication system based on orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA). As an example in which a service has different parameter sets, eMBMS408 may have a longer CP than other services. Since eMBMS transmits higher traffic based on broadcast, the same data can be transmitted in all cells.

[0113] Here, if the signals received by multiple cells are equal to or shorter than the CP length, the UE can receive and decode all signals, thereby obtaining a single frequency network (SFN) diversity gain. Therefore, even UEs located at the cell boundary can receive broadcast information without any coverage limitation. However, in the case where the CP length is relatively longer than other services, in order to support eMBMS in 5G, waste occurs due to CP overhead, and thus a longer OFDM symbol is required compared to the case of other services, resulting in a narrower subcarrier spacing compared to other services.

[0114] Furthermore, as an example of using different parameter sets for services in 5G, in the case of URLLC, shorter OFDM symbols may be required because a shorter TTI is required compared to other services, and furthermore, a wider subcarrier spacing may be required.

[0115] On the other hand, in 5G, one TTI can be defined as a time slot and is configured by 14 OFDM symbols or 7 OFDM symbols. Therefore, when the subcarrier spacing is 15kHz, the length of one time slot is 1ms or 0.5ms. In 5G, one TTI can be defined as a mini-time slot or sub-time slot for emergency transmission and transmission in unlicensed bands, and one mini-time slot can have an OFDM symbol ranging from 1 to (the total number of OFDM symbols of the time slot)-1. If the length of a time slot corresponds to 14 OFDM symbols, the length of the mini-time slot can be determined as one of 1 to 13 OFDM symbols. The length, format or repetition form of the time slot or mini-time slot can be defined according to the standard, or can be sent and received by the UE through a high-layer signal, system information or physical signal. In addition, instead of a mini-time slot or sub-time slot, the length of the time slot can be determined as one of 1 to 14 OFDM symbols, and the length of the time slot can be sent and received by the terminal through a high-layer signal or system information.

[0116] A time slot or a mini-time slot may be defined to have various transmission formats and may be classified into the following formats.

[0117] - DL-only slot or full DL slot: A DL-only slot includes only a downlink period and supports only downlink transmission.

[0118] - DL-centric slots: DL-centric slots include a downlink period, a GP (or flexible symbols), and an uplink period, where the number of OFDM symbols in the downlink period is greater than the number of OFDM symbols in the uplink period.

[0119] - UL-centric time slot: A UL-centric time slot includes a downlink period, a GP (or flexible symbol), and an uplink period, wherein the number of OFDM symbols in the downlink period is smaller than the number of OFDM symbols in the uplink period.

[0120] - UL-only slot or full UL slot: A UL-only slot includes only an uplink period and supports only uplink transmission.

[0121] In the above, only the slot format is classified, but mini-slots can also be classified using the same classification method. For example, mini-slots can be classified into DL-only mini-slots, DL-centric mini-slots, UL-centric mini-slots, and UL-only mini-slots. In the above, flexible symbols can be used as guard symbols for transmission or reception switching and can also be used for channel estimation purposes.

[0122] Hereinafter, although the following detailed description of the embodiments will be directed to LTE and 5G, those skilled in the art will appreciate that the main points of the present disclosure can also be applied to other communication systems with similar technical backgrounds and channel formats, with slight modifications, without substantially departing from the scope of the present disclosure.

[0123] In order to stably support the mobility of terminals in existing mobile communication systems while meeting the requirements of ultra-high-speed data services and ultra-low latency services of the above-mentioned 5G system, it is necessary to configure an integrated system that combines beamforming technology operating in ultra-high frequency bands, new radio access technology (new RAT) with short TTI, and LTE / LTE-A systems operating in relatively low frequency bands. In this case, the new radio access technology is used to meet the requirements of the 5G system, and the LTE / LTE-A system is used to stably support the mobility of terminals.

[0124] Figure 5 The configuration of a communication system to which the present disclosure is applied according to an embodiment of the present disclosure is shown.

[0125] refer to Figure 5 , shows an example of the configuration of an integrated system obtained by combining a base station associated with the new radio access technology with an LTE / LTE-A base station.

[0126] refer to Figure 5 , small base stations 503, 505, and 507 with relatively small coverage areas 504, 506, and 508 can be set in the coverage area 502 of the macro base station 501. Generally, the macro base station 501 can transmit signals at a relatively higher transmission power than the small base stations 503, 505, and 507, so that the coverage area 502 of the macro base station 501 is relatively larger than the coverage areas 504, 506, and 508 of the small base stations 503, 505, and 507. Figure 5 In the example, the macro base station indicates an LTE / LTE-A system operating in a relatively low frequency band, and the small base stations 503, 505 and 507 indicate a system applying a new radio access technology (NR or 5G) operating in a relatively high frequency band.

[0127] The macro base station 501 and the small base stations 503, 505, and 507 are interconnected, and depending on the connection status, there may be a certain degree of backhaul delay between them. Therefore, it may be undesirable to exchange information that is sensitive to transmission delay between the macro base station 501 and the small base stations 503, 505, and 507.

[0128] at the same time, Figure 5While exemplary carrier aggregation is shown between a macro base station 501 and small base stations 503, 505, and 507, the present disclosure is not limited thereto and may be applied to carrier aggregation between base stations located in different geographical locations. For example, according to embodiments of the present disclosure, the present disclosure may also be applied to carrier aggregation between macro base stations located in different locations, or to carrier aggregation between small base stations located in different locations. Furthermore, the number of aggregated carriers is not limited. Alternatively, the present disclosure may also be applied to carrier aggregation in the macro base station 501 and carrier aggregation in the small base stations 503, 505, and 507.

[0129] refer to Figure 5 , macro base station 501 can use frequency f1 for downlink signal transmission, while small base stations 503, 505, and 507 can use frequency f2 for downlink signal transmission. In this case, macro base station 501 can send data or control information to a predetermined UE 509 via frequency f1, while small base stations 503, 505, and 507 can send data or control information via frequency f2. Through the above-described carrier aggregation, base stations implementing new radio access technologies capable of supporting ultra-wideband in high-frequency bands can provide ultra-high-speed data services and ultra-low-latency services, while base stations implementing LTE / LTE-A technologies in relatively low-frequency bands can support stable UE mobility.

[0130] at the same time, Figure 5 The configuration shown applies not only to downlink carrier aggregation, but also to uplink carrier aggregation. For example, UE 509 can send data or control information to macro base station 501 via frequency f1' used for uplink signal transmission. In addition, UE 509 can send data or control information to small base stations 503, 505 and 507 via frequency f2' used for uplink signal transmission. f1' can correspond to f1, and f2' can correspond to f2. The uplink signal transmission by the UE to the macro base station and the small base station can be performed at different time points, or can be performed simultaneously. In either case, due to the physical limitations of the UE's power amplifier elements and the radio wave regulation related to the UE transmission power, the sum of the UE's uplink transmission power at a certain moment needs to be maintained within a predetermined threshold.

[0131] exist Figure 5 In the illustrated environment, the operation of the UE 509 accessing the macro base station 501 and the small base stations 503, 505, and 507 to perform communication is called dual connectivity (DC). If the UE performs dual connectivity, the following two configuration methods are possible.

[0132] First, the UE performs an initial connection to the macro base station 501 operating as an LTE / LTE-A system, and then receives configuration information for data transmission and reception to or from the macro base station via a higher layer signal (system or RRC signal). Thereafter, the UE receives configuration information for data transmission and reception to or from the small base stations 503, 504, and 505 operating as an NR system from a higher layer signal (system or RRC signal) of the macro base station 501, and performs random access to the small base stations 503, 504, and 505, so that the UE enters a dual-connectivity state, in which data can be transmitted and received to or from the macro base station 501 and the small base stations 503, 504, and 505. At this time, the macro base station 501 operating as the LTE / LTE-A system is referred to as a master cell group (MCG), and the small base stations 503, 504, and 505 operating as the NR system are referred to as a secondary cell group (SCG). The state in which the UE is in a dual connectivity state can be exemplified by a case where the UE is configured to use an MCG for E-UTRA radio access (or LTE / LTE-A) and an SCG for NR radio access. Alternatively, it can be exemplified by a case where the UE is configured for E-UTRA NR dual connectivity (EN-DC).

[0133] Second, the UE performs an initial connection to the small base stations 503, 504, and 505 operating as an NR system, and then receives configuration information for data transmission and reception to or from the small base stations from a higher layer signal (system or RRC signal). Thereafter, the UE receives configuration information for data transmission and reception to or from the macro base station 501 operating as an LTE / LTE-A system from a higher layer signal (system or RRC signal) of the small base stations 503, 504, and 505, and performs random access to the macro base station 501, causing the UE to enter a dual-connectivity state, in which data can be transmitted and received to or from the small base stations 503, 504, and 505 and the macro base station 501. At this time, the small base stations 503, 504, and 505 operating as an NR system are referred to as MCGs, and the macro base station 501 operating as an LTE system is referred to as SCGs. The state in which the UE is in a dual-connectivity state can be exemplified by a case in which the UE is configured to use an MCG for NR radio access and an SCG for E-UTRA radio access (or LTE / LTE-A). Alternatively, it can be illustrated by the case where the UE is configured for NR E-UTRA dual connectivity (NE-DC).

[0134] Hereinafter, the embodiments described in the present disclosure will be proposed based on the first dual connectivity configuration method and the second dual connectivity configuration method. For example, depending on whether the LTE cell using E-UTRA corresponds to an MCG or whether the NR cell using NR corresponds to an MCG, the present disclosure proposes another embodiment. If the UE is in a dual connectivity state, since uplink transmission to the MCG is more important than uplink transmission to the SCG, another embodiment is proposed based on whether the LTE cell using E-UTRA is an MCG or whether the NR cell using NR is an MCG. In addition, since the timing for performing uplink transmission to a cell using NR (e.g., PDCCH to PUSCH transmission timing or PDCCH to PUCCH transmission timing) can be differently indicated by a high-layer signal configuration and an instruction from the PDCCH, and the timing for performing uplink transmission to a cell using LTE (e.g., PDCCH to PUSCH transmission timing or PDCCH to PUCCH transmission timing) is fixed, an embodiment will be proposed based on these conditions.

[0135] In the case where the UE is configured for E-UTRA NR dual connectivity, the power allocation method will be described first. For example, in the case where the UE is configured to use an MCG for E-UTRA radio access and is configured to use an SCG for NR radio access, the UE receives a configuration of a maximum power value for the uplink of LTE and a maximum power value for the uplink of NR from an LTE base station or an NR base station. In addition, the UE receives a configuration of a maximum power value for EN-DC operation from the LTE base station or the NR base station. In this case, if the sum of the maximum power value for the uplink of LTE and the maximum power value for the uplink of NR is greater than the maximum power value for EN-DC operation, the UE applies one of the following two power allocation methods.

[0136] First, semi-static power sharing between MCG (LTE) and SCG (NR) is proposed. In the case where a UE receives a reference TDD configuration that limits LTE uplink transmission to only specific subframes in order to perform LTE uplink transmission, if the UE does not provide an indication of the ability to perform dynamic power sharing to the base station or report the ability to the base station, the UE does not expect to perform uplink transmission in the NR time slot that coincides with the time interval in which LTE uplink transmission is performed in the uplink subframe according to the reference TDD configuration (or the UE does not expect configuration or scheduling indicating NR uplink transmission from the NR base station).

[0137] Second, dynamic power sharing between MCG (LTE) and SCG (NR) is proposed. If the UE provides an indication of the ability to perform dynamic power sharing to the base station or reports the ability to the base station, and if the UE's LTE uplink transmission and the NR uplink transmission conflict and the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for EN-DC operation, the UE reduces the NR uplink transmission power so that the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is less than the maximum power value for EN-DC operation. In the case of reducing the NR uplink transmission power, if the transmission power to be reduced is greater than X, the UE may discard the NR transmission. If the transmission power to be reduced is less than X, the UE performs NR uplink transmission using the reduced transmission power.

[0138] Figure 6 Suitable NR uplink transmission and LTE uplink transmission according to an embodiment of the present disclosure are shown.

[0139] refer to Figure 6 , LTE 601 is MCG, operating in TDD mode, NR 602 is SCG. Therefore, if the UE is configured as EN-DC, it can be applied Figure 6 .exist Figure 6 In the example, the TDD cell of LTE 601 corresponds to TDD UL-DL configuration #6 ( Figure 6 The case of TDD UL-DL configuration #6 is described as an example, but not limited thereto. The EN-DC UE can receive TDD UL-DL configuration #6 from system information and can identify the positions of uplink subframes, special subframes, and downlink subframes. Information about the uplink, downlink, or flexible slots of NR 602 and the positions or numbers of their OFDM symbols can be received by the EN-DC UE from system information, higher-level information, or physical layer signals.

[0140] Figure 6 The description will be based on the case where the EN-DC UE operates in a semi-static power allocation mode between LTE 601 and NR 602. For example, Figure 6It is based on a situation where the EN-DC UE receives a configuration of reference TDD configuration #5 among reference TDD configurations (#2, #4, #5) that are capable of limiting LTE uplink transmission only in specific subframes in order to perform uplink transmission of LTE, and the EN-DC UE does not provide an indication of the capability to perform dynamic power allocation to the LTE or NR base station or report the capability to the LTE or NR base station. At this time, among the uplink subframes #2, #3, #4, #7 and #8 of the TDD UL-DL configuration #6 of LTE 601 received via the system information (indicated by reference numerals 604 and 607), the EN-DC UE can identify that LTE uplink transmission is possible only in the uplink subframe #2 that matches the uplink subframe according to the reference TDD configuration #5, and NR uplink transmission is possible in the time slots of NR that match the time intervals of the remaining uplink subframes #3, #4, #7 and #8 (indicated by reference numerals 603, 605, 606 and 608) (see Tables 3 and 4).

[0141] If the EN-DC UE follows the UL HARQ timing relationship between PDCCH transmission and PUSCH transmission defined in TDD UL-DL configuration #6 and the TDD UL-DL configuration for uplink data transmission given from the system information of LTE 601 (see Tables 6 and 7), the EN-DC UE performs PUSCH transmission in uplink subframe #2 by scheduling the PDCCH received from the LTE base station in downlink subframe #5 of LTE 601 (indicated by reference numeral 611). ACK / NACK or PDCCH for the PUSCH is received from the LTE base station in special subframe #6 (indicated by reference numeral 612), and in response, a retransmitted PUSCH is sent in uplink subframe #3 (indicated by reference numeral 613). Since the time interval corresponding to uplink subframe #3 is an interval in which only NR uplink transmission is possible, if PUSCH retransmission by the EN-DC UE occurs, a collision problem occurs between NR uplink transmission and LTE uplink transmission. Therefore, the present disclosure provides a method for solving the above-mentioned problems through Examples 1 and 2.

[0142] Next, combine Figure 6 , another concern will be described based on the case where the EN-DC UE operates in dynamic power allocation mode between LTE 601 and NR 602. For example, if the UE's LTE uplink transmission and NR uplink transmission conflict (e.g., Figure 6608), or when the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for EN-DC operation, the EN-DC UE provides an indication of the ability to perform dynamic power allocation to the base station or reports the ability to the base station, and the EN-DC UE provides a method for solving this problem through embodiment 3. In addition, in uplink subframes #3, #4, #7, and #8, which are time intervals other than uplink subframe #2 (which is restricted to perform LTE uplink transmission according to the reference TDD configuration), if the UE's LTE uplink transmission and NR uplink transmission conflict, as shown in FIG. Figure 6 As shown in the reference numeral 608, or if the sum of the power of LTE uplink transmission and the power of NR uplink transmission is greater than the maximum power value for EN-DC operation, the EN-DC UE provides a method for solving the above problem through embodiment 4.

[0143] Example 1

[0144] Figure 7 An uplink transmission according to an embodiment of the present disclosure is shown.

[0145] refer to Figure 7 , LTE 701 is MCG, operating in TDD mode, NR 702 is SCG. Therefore, if the UE is configured as EN-DC, it can be applied Figure 7 .exist Figure 7 In the example, the TDD cell of LTE 701 corresponds to TDD UL-DL configuration #1. The EN-DC UE receives TDD UL-DL configuration #1 from system information to identify the locations of uplink subframes, special subframes, and downlink subframes. Information about the locations or numbers of uplink, downlink, or flexible time slots and their OFDM symbols in NR 702 can be received by the EN-DC UE from system information, higher-level information, or physical layer signals. Figure 7It is based on a case where the EN-DC UE operates in a semi-static power allocation mode between LTE 701 and NR 702. For example, a case can be assumed in which the EN-DC UE receives a configuration of reference TDD configuration #2 among the reference TDD configurations (#2, #4, #5) that can limit LTE uplink transmission to only specific subframes in order to perform LTE uplink transmission, and the EN-DC UE does not provide an indication of the ability to perform dynamic power allocation to the LTE or NR base station or report the ability to the LTE or NR base station. At this time, among the uplink subframes #2, #3, #7, and #8 of TDD UL-DL configuration #1 of LTE 701 received via system information, the EN-DC UE can recognize that LTE uplink transmission is possible only in uplink subframes #2 and #7 that match the uplink subframes according to reference TDD configuration #2, and NR uplink transmission is possible in NR time slots that match the time intervals of the remaining uplink subframes #3 and #8 (see Tables 3 and 4).

[0146] As described above, if the TDD UL-DL configuration received from the LTE base station of LTE 701 is one of TDD UL-DL configurations #1, #2, #3, #4, and #5 other than TDD UL-DL configurations #0 and #6, and if the reference TDD configuration received from the LTE base station or the NR base station via a higher layer signal is one of #2, #4, and #5, this embodiment proposes that the EN-DC UE follows the TDD UL-DL configurations #1, #2, #3, #4, and #5 in the LTE base station. Figure 7 The UL HARQ timing relationship between PDCCH transmission and PUSCH transmission defined in the TDD UL-DL configuration #1 of LTE and the TDD UL-DL configuration for uplink data transmission given from the system information of LTE 701 (see Tables 6 and 7). In this case, since the EN-DC UE receives uplink subframes according to PDCCH reception, PUSCH transmission, and PUSCH retransmission, where the uplink subframes are generated in the same LTE uplink subframe for each radio frame (indicated by reference numerals 711, 712, 713, and 714), if the EN-DC UE's PUSCH retransmission occurs, collision between NR uplink transmission and LTE uplink transmission may not occur.

[0147] Example 2

[0148] Figure 8 An uplink transmission according to an embodiment of the present disclosure is shown.

[0149] refer to Figure 8 , LTE 801 is MCG, operating in TDD mode, and NR 802 is SCG. Therefore, if the UE is configured as EN-DC, 8 can be applied. Figure 8 In the example, the TDD cell of LTE 801 corresponds to TDD UL-DL configuration #6, and the EN-DC terminal can receive TDD UL-DL configuration #6 from system information to identify the positions of uplink subframes, special subframes, and downlink subframes. Information about the positions or numbers of uplink, downlink, or flexible slots and OFDM symbols of NR 802 can be received by the EN-DC UE from system information, higher-level information, or physical layer signals. Figure 8 Consider the case where an EN-DC UE operates in a semi-static power allocation mode between LTE 801 and NR 802. For example, Figure 8 This is based on a situation in which the EN-DC UE receives reference TDD configuration #4 among reference TDD configurations #2, #4, and #5 that are capable of limiting LTE uplink transmission to only specific subframes in order to perform LTE uplink transmission, and the EN-DC UE does not provide an indication of the ability to perform dynamic power allocation to the LTE or NR base station or report the ability to the LTE or NR base station. At this time, among uplink subframes #2, #3, #4, #7, and #8 of TDD UL-DL configuration #6 of LTE 801 received via system information, the EN-DC UE can recognize that LTE uplink transmission is possible only in uplink subframes #2 and #3 that match the uplink subframes according to reference TDD configuration #4, and NR uplink transmission is possible in NR time slots that match the time intervals of the remaining uplink subframes #4, #7, and #8 (see Tables 3 and 4).

[0150] As described above, if the TDD UL-DL configuration received from the LTE base station of LTE 801 is one of TDD UL-DL configurations #0 and #6, and the reference TDD configuration received from the LTE base station or the NR base station via a higher layer signal is one of configurations #2, #4, and #5, then this embodiment proposes that the EN-DC UE follows the UL HARQ timing relationship between PDCCH transmission and PUSCH transmission defined according to another specific second reference TDD configuration rather than the TDD UL-DL configuration for uplink data transmission given from the system information of LTE 801 (see Tables 6 and 7). In this case, since the EN-DC UE receives uplink subframes according to PDCCH reception, PUSCH transmission, and PUSCH retransmission, where the uplink subframes are generated in the same LTE uplink subframe for each radio frame (indicated by reference numerals 811, 812, 813, and 814), if the PUSCH retransmission of the EN-DC UE occurs, collision between NR uplink transmission and LTE uplink transmission may not occur.

[0151] A second reference TDD configuration for defining UL HARQ timing relationship may be proposed as follows.

[0152] If the UL-DL configuration from the system information corresponds to #6, and the reference TDD configuration is one of #2, #4, and #5, the second reference TDD configuration for UL HARQ timing corresponds to #1.

[0153] If the UL-DL configuration from the system information corresponds to #0, and the reference TDD configuration is one of #2 and #5, the second reference TDD configuration for UL HARQ timing corresponds to #1.

[0154] If the UL-DL configuration from the system information corresponds to #0 and the reference TDD configuration corresponds to #4, if the second reference TDD configuration #1 for UL HARQ timing is followed, the PDCCH for scheduling the PUSCH of uplink subframe #3 needs to be transmitted in downlink subframe #9 of the previous radio frame. However, in UL-DL configuration #0, since subframe #9 is an uplink subframe, a problem occurs in which the PDCCH cannot be transmitted.

[0155] Therefore, if the UL-DL configuration from the system information corresponds to #0, and the reference TDD configuration corresponds to #4, the following proposal is possible.

[0156] First, the second reference TDD configuration for UL HARQ timing corresponds to #1, but the EN-DC UE does not expect to schedule PUSCH in UL subframe #3 of LTE.

[0157] Second, the second reference TDD configuration for UL HARQ timing in UL subframe #2 corresponds to #1, but the EN-DCUE expects that the PDCCH for scheduling the PUSCH in UL subframe #3 is transmitted from downlink subframe #5 of the previous radio frame.

[0158] Third, if the UL-DL configuration from the system information corresponds to #0, the EN-DC UE does not expect the reference TDD configuration to correspond to #4. For example, the UE only expects the case where the reference TDD configuration is configured as #2 or #5.

[0159] Unlike the above proposal, an EN-DC UE may not initially expect UL-DL configuration #0 or #6 from system information. For example, an EN-DC UE may not expect the same configuration as in the second embodiment of the present disclosure and may only receive one of TDD UL-DL configurations #1, #2, #3, #4, or #5 from system information. A reference TDD configuration may be received from higher-layer signals as one of #2, #4, and #5, and the second reference TDD configuration used for UL HARQ timing may be defined as #1 in this specification.

[0160] Example 3

[0161] exist Figure 6 In the embodiment of the present disclosure, if the EN-DC UE provides an indication of a capability of performing dynamic power allocation to the base station or reports the capability to the base station based on a case in which the EN-DC UE operates in a dynamic power allocation mode between LTE 601 and NR 602, then according to an embodiment of the present disclosure, the present disclosure is directed to a case in which, in a time interval of uplink subframe #2 (which is restricted to perform uplink transmission of LTE according to a reference TDD configuration), the LTE uplink transmission and the NR uplink transmission of the UE conflict (such as Figure 6 In the case where the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for EN-DC operation, a method for EN-DC UE to solve this problem is provided through embodiment 3.

[0162] According to the first method, the EN-DC UE only performs LTE uplink transmission and always discards NR uplink transmission. As described above, it is possible to protect the uplink transmission of LTE used as the MCG and maintain the connection with the MCG, as well as send or receive important information required for the RRC connection to the MCG.

[0163] According to the second method, the EN-DC UE maintains the power of the LTE uplink transmission and reduces the power of the NR uplink transmission so that the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is equal to or less than the configured maximum power value of the EN-DC operation. According to the above method, by protecting the uplink transmission of the LTE used as the MCG, it is possible to maintain the connection with the MCG, send or receive important information required for the RRC connection to or from the MCG, and at the same time perform the NR uplink transmission within the maximum power of the EN-DC.

[0164] Example 4

[0165] refer to Figure 6, if the EN-DC UE provides an indication of a capability to perform dynamic power allocation to the base station or reports the capability to the base station based on a case in which the EN-DC UE operates in a dynamic power allocation mode between LTE 601 and NR 602, the present disclosure is directed to a case in which, in uplink subframes #3, #4, #7, and #8 other than uplink subframe #2 (which is restricted to perform uplink transmission of LTE according to the reference TDD configuration), the UE's LTE uplink transmission and the NR uplink transmission conflict (e.g., Figure 6 In the case where the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for EN-DC operation, a method for EN-DC UE to solve this problem is provided through embodiment 4.

[0166] According to the first method, the EN-DC UE performs only LTE uplink transmission and always discards NR uplink transmission. As described above, in the uplink subframes corresponding to the time intervals other than uplink subframe #2 (which is restricted to perform LTE uplink transmission according to the reference TDD configuration), the uplink transmission of LTE used as the MCG can be protected, and the connection with the MCG can be maintained, as well as important information required for the RRC connection can be sent to or received from the MCG.

[0167] According to the second method, the EN-DC UE maintains the power of LTE uplink transmission and reduces the power of NR uplink transmission so that the sum of the power of LTE uplink transmission and the power of NR uplink transmission is equal to or less than the configured maximum power value of EN-DC operation. According to the above method, even in the uplink subframe corresponding to the time interval other than uplink subframe #2 (which is limited to uplink transmission of LTE according to the reference TDD configuration in the above method), the uplink transmission of LTE used as MCG is protected, and the connection with the MCG can be maintained, important information required for the RRC connection can be sent to or received from the MCG, and NR uplink transmission can be performed within the EN-DC maximum power at the same time, thereby increasing the data transmission / reception throughput of the UE.

[0168] According to the third method, the EN-DC UE performs only NR uplink transmission and always discards LTE uplink transmission. According to this method, in uplink subframes corresponding to time intervals other than uplink subframe #2 (which is limited to LTE uplink transmission according to the reference TDD configuration), uplink transmission of NR used as an SCG is possible instead of uplink transmission of LTE used as an MCG, thereby increasing the amount of data transmission / reception using NR and, therefore, increasing the data transmission / reception throughput of the EN-DC UE.

[0169] According to another method, the above three methods can be combined and the resulting combination can be applied to EN-DCUE. For example, the first method can be applied to a specific LTE uplink channel transmission or a specific LTE uplink transmission signal, such as when the LTE uplink transmission corresponds to an important uplink transmission for an RRC connection (such as a physical random access channel (PRACH) transmission). If the LTE uplink transmission does not correspond to a specific LTE uplink transmission or a specific LTE uplink transmission signal, the second or third method can be applied thereto. Alternatively, the third method is applied to a specific NR uplink channel transmission or a specific NR uplink transmission signal, such as when the NR uplink transmission is an important uplink transmission (such as a PRACH transmission), and if the NR uplink transmission does not correspond to a specific NR uplink transmission or a specific NR uplink transmission signal, the first or second method can be applied thereto.

[0170] Figure 9A The base station process is shown, and Figure 9B UE procedures according to various embodiments of the present disclosure are shown.

[0171] First, the base station process will be described.

[0172] refer to Figure 9A and Figure 9B , in operation 911, the base station sends configuration information of each cell to the UE through system information or a higher-layer signal. The configuration information may be cell-related information (TDD or FDD information, uplink and downlink carrier frequencies, uplink and downlink frequency bands, and uplink and downlink subcarrier spacing) of the MCG or SCG cell required for dual connectivity, and may be configuration information required for data transmission and reception in the MCG or SCG. Alternatively, the configuration information may include at least one of the configuration information related to the various parameters described in the embodiments. The base station may be an NR base station using NR radio access, or an E-UTRA base station using E-UTRA radio access.

[0173] At operation 912, the base station configures uplink transmission for the UE according to the embodiments proposed in the present disclosure and transmits scheduling information indicating the uplink transmission. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access. The uplink transmission configuration may refer to uplink transmission that is not indicated by the PDCCH but is configured with a higher-layer signal configuration, such as periodic channel information transmission, and the uplink transmission indicated by the scheduling information may refer to uplink transmission indicated by the PDCCH and transmitted from the UE, such as PUSCH transmission or HARQ-ACK transmission. Alternatively, the uplink transmission may be uplink transmission from the UE, such as PRACH or SRS.

[0174] At operation 913, according to an embodiment proposed in the present disclosure, the base station receives an uplink transmission from the UE. The base station can be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

[0175] Next, the UE procedure will be described.

[0176] In operation 921, the UE receives configuration information of each cell from the base station through system information or a high-layer signal. The configuration information may be cell-related information (TDD or FDD information, uplink and downlink carrier frequencies, uplink and downlink frequency bands, and uplink and downlink subcarrier spacing) of the MCG or SCG cell required for dual connectivity, and may be configuration information required for data transmission or reception in the MCG or SCG. Alternatively, the configuration information may include at least one of the configuration information related to the various parameters described in the embodiments. As described in the embodiments of the present disclosure, before receiving the dynamic power sharing capability from the base station via a high-layer signal, the UE may send capability-related information to the base station. The base station may be an NR base station using NR radio access, or an E-UTRA base station using E-UTRA radio access.

[0177] In operation 922, according to an embodiment proposed in the present disclosure, the UE receives uplink transmission configuration information from a base station and receives scheduling information indicating uplink transmission. The base station can be an NR base station using NR radio access, or an E-UTRA base station using E-UTRA radio access. The uplink transmission configuration information can represent configuration information related to uplink transmission (such as periodic channel information transmission) that is not indicated by PDCCH but configured with a higher-layer signal configuration, and the uplink transmission indicated by the scheduling information can represent an uplink transmission indicated by PDCCH and sent from the UE, such as PUSCH transmission or HARQ-ACK transmission. Alternatively, the uplink transmission can be an uplink transmission sent from the UE, such as PRACH or SRS.

[0178] At operation 923, according to the embodiments proposed in the present disclosure, the UE uses the UL HARQ timing relationship (PDCCH to PUSCH transmission, PUSCH to PDCCH transmission, etc.) to control transmission timing and transmission power, and sends an uplink transmission to the base station. The control of transmission power may include dropping uplink transmissions or reducing uplink transmission power as described in the embodiments. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

[0179] Figure 10 The embodiment of the present disclosure shows that the EN-DC UE is addressed by using a cell with a specific configuration. Figure 5 The concerns about base stations sending or receiving data are described in [1].

[0180] Figure 10 It is based on the case where the LTE cell corresponds to the MCG and can be configured for EN-DC UEs through carrier aggregation (CA) of two cells, or as described below, where there is only one cell configured for EN-DC UEs without carrier aggregation, the primary cell (PCell) only. Figure 10 This is based on a case where the NR cell corresponds to an SCG and is configured for EN-DC UE using one cell 1002 according to an embodiment of the present disclosure. The present disclosure is described under the assumption that the PCell 1001 as the first LTE cell of the MCG operates as a TDD cell and corresponds to TDD UL-DL configuration #0, and the secondary cell (SCell) 1003 as the second LTE cell of the MCG operates as an FDD cell. Figure 10In the embodiment, SCell 1003 is an FDD cell, but can operate according to TDD UL-DL configuration #0, such as a TDD cell, especially PCell 1001, or SCell can operate according to another TDD UL-DL configuration in the present disclosure. For example, the TDD configuration or FDD configuration of SCell 1003 is not limited to Figure 10 The configuration shown is shown, and other configurations can be applied in the same way.

[0181] refer to Figure 10 The EN-DC UE may receive TDD UL-DL configuration #0 of PCell 1001 from system information to identify the locations of uplink subframes, special subframes, and downlink subframes, and may receive TDD UL-DL configuration #0 of PCell 1001 from higher-layer signals to identify carrier information and bandwidth information of SCell 1003. Information about the locations or numbers of uplink, downlink, or flexible time slots and OFDM symbols of the NR cell 1002 may be received by the EN-DC UE from system information, higher-layer information, or physical layer signals. Figure 10 Consider the case where EN-DC UE operates in semi-static power allocation mode between LTE and NR. Figure 10This is based on a situation in which, among reference TDD configurations #2, #4, and #5 that can limit LTE uplink transmission to only specific subframes in order to perform LTE uplink transmission, the EN-DC UE receives reference TDD configuration #2 via a higher layer signal, or in which the EN-DC UE does not provide an indication of the ability to perform dynamic power sharing to the LTE or NR base station or reports the ability to the LTE or NR base station. At this time, among uplink subframes #2, #3, #4, #7, #8, and #9 of TDD UL-DL configuration #0 of PCell 1001 received via system information, the EN-DC UE can recognize that LTE uplink transmission is possible only in uplink subframes #2 and #7 that match the uplink subframes according to reference TDD configuration #2, and NR uplink transmission is possible in NR time slots that match the time intervals of the remaining uplink subframes #3, #4, #8, and #9. Therefore, based on the timing relationship in UL-DL configuration #2 of Tables 3 and 4, corresponding to the reference TDD configuration value #2, the EN-DC UE may transmit HARQ ACK / NACK for downlink data transmitted from the PCell 1001. For example, if downlink data is received from subframes #4, #5, #8, and #6 of the PCell 1001, the EN-DC UE transmits HARQ ACK / NACK feedback for the downlink data in subframe #2 of the PCell 1001 (indicated by reference numeral 1011), and if downlink data is received from subframes #9, #0, #3, and #1, the EN-DC UE transmits HARQ ACK / NACK feedback for the downlink data in subframe #7 of the PCell 1001 (indicated by reference numeral 1012).

[0182] Because HARQ ACK / NACK for downlink data reception of the LTE SCell 1003 needs to be transmitted from the PCell 1001 serving as the primary cell, HARQ ACK / NACK transmission is also possible only in specific LTE subframes of the PCell 1001. For example, an EN-DC UE can recognize that LTE uplink transmission is possible only in uplink subframes #2 and #7 that match uplink subframes according to the reference TDD configuration #2, and that NR uplink transmission is possible only in NR time slots that match the time intervals of the remaining uplink subframes #3, #4, #8, and #9.

[0183] Therefore, based on the timing relationship in the DL reference UL-DL configuration #2 of Table 8 corresponding to the reference TDD configuration value #2, HARQ ACK / NACK for the downlink data transmitted from the LTE SCell 1003 is transmitted. For example, if downlink data is received from subframes #4, #5, #6, #7, and #8 of the LTE SCell 1003, the EN-DC UE transmits HARQ ACK / NACK feedback (indicated by reference numeral 1013) for the downlink data in subframe #2 of the PCell 1001, and if downlink data is received from subframes #9, #0, #1, #2, and #3 of the LTE SCell 1003, the EN-DC UE transmits HARQ ACK / NACK feedback for the downlink data in subframe #7 of the PCell 1001.

[0184] Referring to Table 8, which is similar to Table 3, if the UE receives a PDSCH transmitted to a subframe (nk) of an FDD SCell from a base station, the UE transmits an uplink HARQ ACK / NACK for the PDSCH to an uplink subframe n of a TDD PCell. In this case, "k" is an element of a set K, and K is defined in Table 8. K is called a bundling window and represents a set of multiple downlink subframes in which a PDCCH / EPDCCH or PDSCH corresponding to the transmission of an HARQ ACK / NACK in one uplink subframe is transmitted.

[0185] [Table 8]

[0186]

[0187] At this time, when transmitting HARQ ACK / NACK feedback in subframe #2 of PCell 1001, the EN-DC UE may use PUCCH format 1a / 1b, PUCCH 1b with channel selection, or PUCCH format 3 / 4 / 5 defined in the LTE standard to transmit HARQ ACK / NACK feedback. The EN-DC UE may be pre-configured, through higher layer signaling from the base station, with respect to which PUCCH format among multiple PUCCH formats will be used to transmit HARQ ACK / NACK feedback. Furthermore, for specific cases (e.g., when receiving a single PDSCH in PCell 1001 scheduled by a PDCCH / EPDCCH with a "DAI" field corresponding to 1, a single PDCCH indicating DL SPS release with a "DAI" field corresponding to 1, or a single PDSCH in PCell 1001 without a PDCCH / EPDCCH), the LTE standard may be arranged so that one of the PUCCH formats is used based on the UE's determination. The higher layer signal may include information about the PUCCH format that the EN-DC UE needs to use when sending HARQ-ACK feedback, and information about at least one resource or multiple resources used to send the PUCCH format, and the EN-DC UE may receive the higher layer signal to send the PUCCH format including the HARQ-ACK feedback via specific resources.

[0188] The method for selecting a resource from among the resources used to transmit a PUCCH format by an EN-DC UE is as follows. An EN-DC UE that receives multiple PDCCHs / EPDCCHs over multiple subframes of PCell 1001 or LTE SCell 1003 may use a 2-bit value of the "Transmit Power Control (TPC) Command" field of the PDCCH / EPDCCH to indicate one of the four resources if the "Downlink Allocation Index (DAI)" field from the PDCCH / EPDCCH is greater than 1, or if the PDCCH / EPDCCH with the "DAI" field set to 1 is not the first PDCCH / EPDCCH in set K (see Table 3 or Table 8). A UE that has received one resource from the "TPC Command" field sends HARQ ACK / NACK feedback to the PUCCH format configured using that resource. At this time, if the "DAI" field is 1, or the PDCCH / EPDCCH in which the "DAI" field is 1 is the first PDCCH / EPDCCH in set K (see Table 3 or Table 8), the 2-bit value of the "Transmission Power Control (TPC) Command" field of the PDCCH / EPDCCH can indicate the power adjustment value when sending the configured PUCCH format. The EN-DC UE adjusts and transmits the power of the PUCCH format from the "TPC Command" field.

[0189] Here, if the EN-DC UE receives only the PDSCH via one of the first PDCCHs / EPDCCHs in PCell 1001, or receives only one PDCCH / EPDCCH for DL SPS release (indicated by reference numerals 1011 or 1012), or receives only the PDSCH in which the corresponding PDCCH does not exist, or if the base station transmits a PDCCH / EPDCCH for scheduling multiple PDSCHs in multiple subframes, but the EN-DC UE receives only the PDSCH via one of the first PDCCHs / EPDCCHs due to a reception error, the "TPC command" field in the received PDCCH / EPDCCH is a field used for power control when transmitting a PUCCH format. Therefore, the EN-DC UE cannot know which resource among multiple configured PUCCH transmission resources should be used to transmit the PUCCH format. Therefore, the present disclosure provides a method for determining the PUCCH transmission resource of the PUCCH format in the above situation.

[0190] According to the first method, in the above situation, the base station can separately configure the PUCCH transmission resources of the PUCCH format for the EN-DC UE through high-layer signals. In addition to the multiple resources for sending the above-mentioned PUCCH formats (which are resources mapped to the TPC command field), additional PUCCH resources can be configured to solve the above-mentioned problems. At this time, the PUCCH resources can be resources for PUCCH formats 3 / 4 / 5 or resources for PUCCH formats 1a / 1b. Therefore, if the UE determines that the PUCCH corresponds to resources for PUCCH format 3 / 4 / 5 transmission, or if it is defined in the standard, the UE can send PUCCH format 3 / 4 / 5 through the PUCCH resources. If the UE determines that the PUCCH resources correspond to resources for PUCCH format 1a / 1b transmission, or if it is defined in the standard, the UE can send PUCCH format 1a / 1b through the PUCCH resources.

[0191] For example, different PUCCH resources may be configured for the following cases: a case where a single PDSCH in a PCell scheduled by a PDCCH / EPDCCH with a "DAI" field of 1 is received (case 1), a case where a single PDCCH indicating DL SPS release is received with a "DAI" field of 1 (case 2), and a case where a single PDSCH is received in a PCell where no PDCCH / EPDCCH exists (case 3), or a single PUCCH resource may be configured for the above cases. In the above cases (i.e., case 1, case 2, and case 3), if different PUCCH resources are configured and two or more cases occur within one bundling window (K), the UE may perform PUCCH format transmission using PUCCH format 1b with channel selection. At this time, PUCCH resources for transmitting PUCCH format 1b with channel selection are configured using resources configured for case 1, resources configured for case 2, and resources configured for case 3, and which resource to use is determined based on the transmitted HARQ-ACK information, and the UE may transmit PUCCH format 1b on the determined resource.

[0192] In this case, the characteristics of the resources for Case 3 may be as follows: If there is only an LTE cell and no NR cell, that is, when no SCG is configured for the EN-DC UE, the EN-DC UE may receive a pre-configured PUCCH from a higher-layer signal for use in the case where a single PDSCH is received in a PCell where no PDCCH / EPDCCH exists, and may use this resource to perform PUCCH format transmission in Case 3.

[0193] In the above cases (i.e., Case 1, Case 2, and Case 3), if one PUCCH resource is configured as a higher-layer signal and two or more cases occur within one bundling window (K), the UE can use PUCCH format 3 / 4 / 5 to perform PUCCH format transmission.

[0194] In the above problem situation, the EN-DC UE receives resources via a high-layer signal and sends a PUCCH format including HARQ-ACK feedback through the resources configured via the high-layer signal. Alternatively, the EN-DC UE can configure PUCCH resources for the problem situation within multiple resources (which are resources mapped to the TPC command field). For example, if there are four pre-configured resources (which are resources mapped to the TPC command field), one of the four resources can be configured for use in the above problem via a high-layer signal, and the high-layer signal can be included in the information used to configure multiple resources and sent as separate information. The UE sends PUCCH format 3 / 4 / 5 via PUCCH resources. This transmission method enables the UE to send PUCCH format 3 / 4 / 5 without the need for additional PUCCH resource configuration.

[0195] According to the second method, in the above situation, the base station can use the "TPC Command" field in the first PDCCH / EPDCCH to indicate the PUCCH transmission resources of PUCCH format 3 / 4 / 5 to the EN-DC UE. Therefore, the "TPC Command" field is used by the EN-DC UE to adjust the power when transmitting the PUCCH format and is also used to determine the resources used for PUCCH format transmission. For example, the EN-DC UE transmits the PUCCH format in the resources indicated by the value of the "TPC Command" field in the first PDCCH / EPDCCH by adjusting the power according to the value of the "TPC Command" field.

[0196] According to a third method, in the above case, by default, the EN-DC UE transmits the PUCCH format by using one of the multiple resources (which are resources mapped to the TPC command field) used to transmit the above-mentioned PUCCH format 3 / 4 / 5. For example, among the multiple resources, the resource to be used in the above-mentioned problem is defined in the standard, and the EN-DC UE transmits PUCCH format 3 / 4 / 5 including HARQ-ACK feedback via the predefined resources. For example, the standard can be arranged so that if the TPC command field is 2 bits, the first resource corresponding to "00" among "00", "01", "10" and "11" will be used. Alternatively, the standard can be arranged so that which of the four resources should be used is determined based on an equation including one or more pieces of information, such as a downlink subframe index in which the PDCCH / EPDCCH is received, an uplink subframe index in which the PUCCH is transmitted, and a UE unique identifier.

[0197] According to the fourth method, in the above problem, the EN-DC UE includes HARQ ACK / NACK feedback in PUCCH format 1a / 1b instead of using PUCCH format 3 / 4 / 5 and transmits it. At this time, the transmission resources of PUCCH format 1a / 1b can be implicitly mapped to the transmission resources of the PDCCH / EPDCCH received in the above problem. In order to prevent conflict with the PUCCH transmission resources of the existing LTE UE, the base station can send an offset value to be added to the PUCCH transmission resources to the DC UE through a high-layer signal. The EN-DC UE can determine the transmission resources based on the implicitly mapped PUCCH transmission resources and the offset value. For example, the EN-DC UE that has received the offset value determines the transmission resources of PUCCH format 1a / 1b by adding the offset value to the PUCCH transmission resources that have been implicitly mapped to the transmission resources of the received PDCCH / EPDCCH. Then, the EN-DC UE can send PUCCH format 1a / 1b via the determined transmission resources.

[0198] According to the fifth method, if PUCCH resources are configured for the UE via a high-layer signal, that is, in addition to the resources mapped to the TPC command field, the UE also receives the configuration of the PUCCH resources via a high-layer signal, in order to solve the above problem, the UE can send the PUCCH format on the configured PUCCH transmission resource via the high-layer signal. Therefore, as described in the first method, the UE receives a high-layer signal from the base station and sends the corresponding PUCCH format on the PUCCH resource according to the high-layer signal. If, as described in the first method, the PUCCH resources used to solve the above problem are not configured separately for the UE, the standard described in the third method defines whether to use specific resources among the pre-configured PUCCH resources (that is, among the resources mapped to the TPC command field) to send the PUCCH format, and the UE can determine the PUCCH resources and send the PUCCH format by the defined method. Therefore, in this case, as described in the third method, if there is no high-layer signal from the base station, or if there is no corresponding information in the high-layer signal, the UE uses the PUCCH resources defined in the standard to send the corresponding PUCCH format.

[0199] According to the fifth method described above, if the base station determines that the UE's PDCCH reception is unstable, PUCCH transmission resources can be additionally configured through higher-layer signals to perform PUCCH transmission on the resources. If it is determined that the UE's PDCCH reception is stable, the resources can be used to perform data transmission without additionally configuring PUCCH transmission resources through higher-layer signals.

[0200] Figure 11 A base station according to an embodiment of the present disclosure is shown.

[0201] refer to Figure 11 , the controller 1101 can be configured according to the present disclosure Figure 9A The base station process and various embodiments of the present disclosure are used to configure the required information, and the uplink transmission timing and uplink transmission reception from the UE can be controlled according to various embodiments. The controller 1101 can perform control so that control information is sent through the LTE or 5G control information sending device 1105, and data can be sent to or received from the UE through the LTE or 5G data sending / receiving device 1107. In addition, the controller 1101 can perform control so that the scheduler 1103 schedules LTE or 5G data, and sends or receives LTE or 5G data to or from the UE through the LTE or 5G data sending / receiving device 1107. In the above, the base station device includes the controller 1101, the scheduler 1103, the LTE or 5G control information sending device 1105 and the LTE or 5G data sending / receiving device 1107, but the base station device may include a transceiver and a controller. The controller can control the operation of the base station according to various embodiments. Although LTE and 5G are described together in a base station for convenience, the base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

[0202] According to an embodiment of the present disclosure, the controller is configured to send a higher signal including multiple PUCCH resource information to the terminal via the transceiver, send PDSCH to the terminal via the transceiver, and receive HARQ feedback information corresponding to the PDSCH from the terminal based on the PUCCH format and resources via the transceiver, wherein the PUCCH format uses a preset format and the resource corresponds to the first PUCCH resource among the multiple PUCCH resource information, if the evolved UMTS EUTRA NR-EN-DC is set in the terminal, the TDD frame structure is set in the primary cell (PCell) of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the DCI format corresponding to the PDSCH is set to 1.

[0203] According to an embodiment of the present disclosure, wherein the preset format is PUCCH format 3. According to an embodiment of the present disclosure, wherein the PUCCH format uses the preset format, and the resource corresponds to the first PUCCH resource among multiple PUCCH resource information, if EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the PDCCH corresponding to the PDSCH is not detected.

[0204] According to an embodiment of the present disclosure, the reference TDD configuration information indicates a reference configuration for transmitting an LTE uplink signal, and the reference TDD configuration information indicates at least one of TDD configurations 2, 4, or 5.

[0205] According to an embodiment of the present disclosure, the controller is further configured to send a PDCCH indicating a downlink (DL) SPS release, and receive new HARQ feedback information corresponding to the reception of the PDCCH, wherein the new HARQ feedback information is sent based on a preset format and a first PUCCH resource among multiple PUCCH resource information, if EN-DC is set in the terminal, a TDD frame structure is set in the PCell of the terminal, reference TDD configuration information is set in the terminal, and the DAI field value of the PDCCH is set to 1.

[0206] Figure 12 A UE according to an embodiment of the present disclosure is shown.

[0207] refer to Figure 12 , the controller 1201 can be configured according to the present disclosure Figure 9B The UE process and various embodiments of the present disclosure receive the required configuration information and scheduling from the base station, and can control the uplink transmission timing and uplink transmission power according to the present disclosure to perform uplink transmission configured by the base station or indicated by the scheduling. The UE can receive the location of the uplink data channel transmission resource from the base station through the LTE or 5G control information receiving device 1205 and the LTE or 5G data sending / receiving device 1206, or multiplex the uplink control information on the uplink data channel and send them. The controller 1201 can perform control so that the LTE or 5G data scheduled at the received resource location is sent to the LTE or 5G base station or received from the LTE or 5G base station through the LTE or 5G data sending / receiving device 1206. In the above, the UE includes the controller 1201, the LTE or 5G control information receiving device 1205 and the LTE or 5G data sending / receiving device 1206, but the UE may include a transceiver and a controller. The controller can control the operation of the UE according to various embodiments. Reference Figure 12 For ease of explanation, LTE and 5G have been described together. The base station used to transmit or receive control information and data may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

[0208] According to an embodiment of the present disclosure, a controller is configured to receive a higher signal including multiple PUCCH resource information via a transceiver, determine a PUCCH format and resources for HARQ feedback information corresponding to a PDSCH, and send HARQ feedback information via a transceiver based on the determined PUCCH format and resources, wherein the PUCCH format uses a preset format and the resource corresponds to the first PUCCH resource among multiple PUCCH resource information, if EUTRA NR-EN-DC is set in the terminal, a TDD frame structure is set in the primary cell (PCell) of the terminal, reference TDD configuration information is set in the terminal, and the DAI field value of the DCI format corresponding to the PDSCH is set to 1.

[0209] According to an embodiment of the present disclosure, wherein the preset format is PUCCH format 3. According to an embodiment of the present disclosure, wherein the PUCCH format uses the preset format, and the resource corresponds to the first PUCCH resource among multiple PUCCH resource information, if EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and a physical downlink control channel (PDCCH) corresponding to the PDSCH is not detected.

[0210] According to an embodiment of the present disclosure, the reference TDD configuration information indicates a reference configuration for transmitting an LTE uplink signal, and the reference TDD configuration information indicates at least one of TDD configurations 2, 4, or 5.

[0211] According to an embodiment of the present disclosure, the controller is further configured to receive a PDCCH indicating a DL SPS release, and to send new HARQ feedback information corresponding to the reception of the PDCCH, wherein the new HARQ feedback information is sent based on a preset format and a first PUCCH resource among multiple PUCCH resource information, if EN-DC is set in the terminal, a TDD frame structure is set in the PCell of the terminal, reference TDD configuration information is set in the terminal, and the DAI field value of the PDCCH is set to 1.

[0212] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving a higher layer signal including information about a plurality of physical uplink control channel (PUCCH) resources; Determining a PUCCH format and resources for hybrid automatic repeat request (HARQ) feedback information corresponding to a physical downlink shared channel (PDSCH); and Sending the HARQ feedback information based on the determined PUCCH format and resource, In the following case, the PUCCH format uses a preset format corresponding to PUCCH format 3, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources mapped to the transmission power control TPC command field: An Evolved Universal Mobile Telecommunications System UMTS Terrestrial Radio Access EUTRA New Radio NR-Dual Connectivity EN-DC is set in the terminal, Setting a time division duplex (TDD) frame structure in the primary cell (PCell) of the terminal, setting reference TDD configuration information in the terminal, and The downlink allocation index DAI field value of the DCI format corresponding to the PDSCH is set to 1.

2. The method according to claim 1, wherein When EN-DC is set in the terminal, a TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the physical downlink control channel PDCCH corresponding to the PDSCH is not detected, the PUCCH format uses the preset format, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources.

3. The method according to claim 1, wherein The reference TDD configuration information indicates a reference configuration for transmitting a long term evolution (LTE) uplink signal, and The reference TDD configuration information indicates at least one of TDD configurations 2, 4 or 5.

4. The method according to claim 1, further comprising: Receiving a PDCCH indicating a downlink semi-persistent scheduling (SPS) release; as well as sending new HARQ feedback information corresponding to the reception of the PDCCH, In which, when EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the PDCCH is set to 1, the new HARQ feedback information is sent based on the preset format and the first PUCCH resource among the multiple PUCCH resources.

5. A method performed by a base station in a wireless communication system, the method comprising: Sending a higher layer signal including information about a plurality of physical uplink control channel (PUCCH) resources to a terminal; sending a physical downlink shared channel (PDSCH) to the terminal; and receiving hybrid automatic repeat request (HARQ) feedback information corresponding to the PDSCH from the terminal based on a PUCCH format and resource, In the following case, the PUCCH format uses a preset format corresponding to PUCCH format 3, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources mapped to the transmission power control TPC command field: An Evolved Universal Mobile Telecommunications System UMTS Terrestrial Radio Access EUTRA New Radio NR-Dual Connectivity EN-DC is set in the terminal, Setting a time division duplex (TDD) frame structure in the primary cell (PCell) of the terminal, setting reference TDD configuration information in the terminal, and The downlink allocation index DAI field value of the DCI format corresponding to the PDSCH is set to 1.

6. The method according to claim 5, wherein: The reference TDD configuration information indicates a reference configuration for transmitting a long term evolution (LTE) uplink signal, and The reference TDD configuration information indicates at least one of TDD configurations 2, 4 or 5.

7. The method according to claim 5, wherein: When EN-DC is set in the terminal, a TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the physical downlink control channel PDCCH corresponding to the PDSCH is not detected, the PUCCH format uses the preset format, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources.

8. The method according to claim 5, further comprising: Sending a PDCCH indicating the release of downlink semi-persistent scheduling (SPS); as well as receiving new HARQ feedback information corresponding to reception of the PDCCH, In which, when EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the PDCCH is set to 1, the new HARQ feedback information is sent based on the preset format and the first PUCCH resource among the multiple PUCCH resources.

9. A terminal in a wireless communication system, the terminal comprising: transceiver; and The controller is configured as: receiving, via the transceiver, a higher layer signal including information about a plurality of physical uplink control channel (PUCCH) resources, determining a PUCCH format and resources for hybrid automatic repeat request (HARQ) feedback information corresponding to a physical downlink shared channel (PDSCH), and sending the HARQ feedback information via the transceiver based on the determined PUCCH format and resource, In the following case, the PUCCH format uses a preset format corresponding to PUCCH format 3, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources mapped to the transmission power control TPC command field: An Evolved Universal Mobile Telecommunications System UMTS Terrestrial Radio Access EUTRA New Radio NR-Dual Connectivity EN-DC is set in the terminal, Setting a time division duplex (TDD) frame structure in the primary cell (PCell) of the terminal, setting reference TDD configuration information in the terminal, and The downlink allocation index DAI field value of the DCI format corresponding to the PDSCH is set to 1.

10. The terminal according to claim 9, wherein: When EN-DC is set in the terminal, a TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the physical downlink control channel PDCCH corresponding to the PDSCH is not detected, the PUCCH format uses the preset format, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources. The terminal according to claim 9 , wherein: The reference TDD configuration information indicates a reference configuration for transmitting a long term evolution (LTE) uplink signal, and The reference TDD configuration information indicates at least one of TDD configurations 2, 4 or 5.

12. The terminal according to claim 9, wherein: The controller is further configured to: receiving a PDCCH indicating a downlink semi-persistent scheduling (SPS) release, and sending new HARQ feedback information corresponding to the reception of the PDCCH, In which, when EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the PDCCH is set to 1, the new HARQ feedback information is sent based on the preset format and the first PUCCH resource among the multiple PUCCH resources.

13. A base station in a wireless communication system, the base station comprising: transceiver; and The controller is configured as: sending, via the transceiver, a higher layer signal including information about a plurality of physical uplink control channel (PUCCH) resources to the terminal, sending a physical downlink shared channel (PDSCH) to the terminal via the transceiver, and receiving, via the transceiver, hybrid automatic repeat request (HARQ) feedback information corresponding to the PDSCH from the terminal based on a PUCCH format and resource, In the following case, the PUCCH format uses a preset format corresponding to PUCCH format 3, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources mapped to the transmission power control TPC command field: An Evolved Universal Mobile Telecommunications System UMTS Terrestrial Radio Access EUTRA New Radio NR-Dual Connectivity EN-DC is set in the terminal, Setting a time division duplex (TDD) frame structure in the primary cell (PCell) of the terminal, setting reference TDD configuration information in the terminal, and The downlink allocation index DAI field value of the DCI format corresponding to the PDSCH is set to 1.

14. The base station according to claim 13, wherein: When EN-DC is set in the terminal, a TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and a physical downlink control channel PDCCH corresponding to the PDSCH is not detected, the PUCCH format uses the preset format, and the resource corresponds to the first PUCCH resource among the multiple PUCCH resources. The reference TDD configuration information indicates a reference configuration for sending a long term evolution (LTE) uplink signal, and The reference TDD configuration information indicates at least one of TDD configurations 2, 4 or 5.

15. The base station according to claim 13, wherein: The controller is further configured to: Sending a PDCCH indicating the release of downlink semi-persistent scheduling (SPS), and receiving new HARQ feedback information corresponding to reception of the PDCCH, and In which, when EN-DC is set in the terminal, the TDD frame structure is set in the PCell of the terminal, the reference TDD configuration information is set in the terminal, and the DAI field value of the PDCCH is set to 1, the new HARQ feedback information is sent based on the preset format and the first PUCCH resource among the multiple PUCCH resources.

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