Method, device and system for uplink transmission and downlink reception in a wireless communication system

Abstract

The present invention relates to a method, device and system for uplink transmission and downlink reception in a wireless communication system. The present invention relates to a method for transmission and reception of a radio signal by a terminal in a wireless communication system. According to the present specification, a method is disclosed, comprising the steps of determining whether transmission of an uplink radio signal assigned to a terminal or reception of a downlink radio signal is possible on a time slot configured to include at least one of one or more downlink symbols for downlink transmission, one or more flexible symbols, and one or more uplink symbols for uplink transmission; and controlling the transmission of the uplink radio signal or the reception of the downlink radio signal based on the determination. According to the present invention, even if the configuration of the time slot is changed, the terminal can transmit the uplink radio signal, and thus uplink radio signal transmission omission or unnecessary retransmission of the uplink radio signal can be prevented. And by defining the valid timing of the uplink signal such as a physical random access channel, the frequency efficiency of the network can be increased and the energy consumption of the terminal can be reduced.

Description

[0001] This application is a divisional application of patent application No. 201880069046.5 (PCT / KR2018 / 010647), filed on April 23, 2020, with an international application date of September 11, 2018, entitled "Method, Apparatus and System for Uplink Transmission and Downlink Reception in a Wireless Communication System". Technical Field

[0002] This invention relates to wireless communication, and more particularly to methods, apparatus, and systems for transmitting uplink signals and channels and receiving downlink signals and channels in a wireless communication system. Background Technology

[0003] Following the commercialization of fourth-generation (4G) communication systems, efforts are underway to develop new fifth-generation (5G) communication systems to meet the ever-growing demand for wireless data services. 5G communication systems are referred to as systems beyond 4G networks, post-LTE systems, or new radio (NR) systems. To achieve high data transmission rates, 5G communication systems include systems operating in millimeter-wave (mmWave) bands of 6 GHz or higher, and systems operating in bands of 6 GHz or lower are also being considered to ensure coverage. Implementation in base stations and terminals is being considered.

[0004] The 3GPP (3rd Generation Partnership Project) NR system enhances network spectral efficiency and enables communication providers to offer more data and voice services within a given bandwidth. Therefore, in addition to supporting a large volume of voice calls, 3GPP NR systems are designed to meet the demands of high-speed data and media transmission. The advantages of NR systems include higher throughput and lower latency on the same platform, support for both Frequency Division Duplex (FDD) and Time Division Duplex (TDD), and lower operating costs due to an enhanced end-user environment and a simpler architecture.

[0005] For more efficient data processing, the dynamic TDD of the NR system can use methods to change the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols that can be used in the uplink and downlink based on the data traffic direction of cell users. For example, when the downlink traffic of a cell is greater than the uplink traffic, the base station can allocate multiple downlink OFDM symbols to time slots (or subframes). Information about the time slot configuration should be sent to the terminal.

[0006] To mitigate path loss and increase transmission distance in millimeter-wave bands, beamforming, massive MIMO, full-size MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming combining analog and digital beamforming, and massive MIMO technologies are discussed in 5G communication systems. Furthermore, to improve network performance, technologies related to evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, wireless backhaul, non-terrestrial network communication (NTN), mobile networks, cooperative communication, Co-op Multi-point (CoMP), and interference cancellation are under development in 5G communication systems. Additionally, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) are being developed as advanced coding and modulation (ACM) schemes, while filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are being developed as advanced connectivity technologies in 5G systems.

[0007] Simultaneously, within a human-centric network of connections where people generate and consume information, the internet has evolved into an Internet of Things (IoT) network, exchanging information between distributed components such as objects. The Internet of Everything (IoE) technology, combining IoT with big data processing through connections to cloud servers, is also emerging. Implementing IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. Therefore, in recent years, technologies such as sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) have been researched for connecting objects. In the IoT environment, a smart internet technology (IT) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. Through the integration and hybridization of existing information technology (IT) with various industries, IoT can be applied to areas such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart appliances, and advanced medical services.

[0008] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as beamforming, MIMO, and array antennas are being used to implement technologies such as sensor networks, machine-to-machine (M2M), and machine-type communication (MTC). Cloud RAN, as an application of the aforementioned big data processing technologies, is an example of the convergence of 5G and IoT technologies. Typically, mobile communication systems have been developed to provide voice services while ensuring user activity.

[0009] However, mobile communication systems are not only expanding their voice services but also their data services, and have now evolved to the point of providing high-speed data services. However, due to resource shortages and users' demands for high-speed services, more advanced mobile communication systems are needed within the current mobile communication systems providing services.

[0010] In 3GPP NR systems, a dynamic time division duplex (TDD) scheme can be used, where the direction of the OFDM symbols in the configured time slots can be freely changed according to the downlink and downlink traffic of the small cell. The base station transmits information related to the time slot configuration to the terminal to support dynamic TDD. However, because there may be issues such as the terminal not receiving the time slot configuration information or being unable to perform terminal operations due to changes in the time slot configuration, a method to mitigate these problems is required. Summary of the Invention

[0011] Technical issues

[0012] The present invention provides a method, apparatus and system for transmitting and receiving control channels in a wireless communication system.

[0013] The present invention also provides a terminal and its operation method for transmitting or receiving control channels when the time slot configuration, including TDD-based DL symbols, flexible symbols and UL symbols, is changed.

[0014] The present invention also provides a base station and its operation method for receiving or transmitting control channels when the time slot configuration, including TDD-based DL symbols, flexible symbols and UL symbols, is changed.

[0015] The present invention also provides a terminal and its operation method for effectively transmitting or receiving control channels in a time slot configuration including TDD-based DL symbols, flexible symbols and UL symbols.

[0016] The present invention also provides a base station and its operation method for effectively receiving or transmitting control channels in a time slot configuration including TDD-based DL symbols, flexible symbols and UL symbols.

[0017] Technical solution

[0018] According to an exemplary embodiment of the present invention, a user equipment (UE) is provided for controlling uplink transmission and downlink reception in a wireless communication system. The UE includes a communication module configured to transmit uplink radio signals to a base station or receive downlink radio signals allocated to a terminal from a base station; a memory configured to store control programs and data used in the terminal; and a processor configured to determine whether the transmission of uplink radio signals or the reception of downlink radio signals allocated to the terminal is available in a time slot configured to include at least one downlink symbol for downlink transmission and at least one flexible symbol for transmitting downlink transmission, and at least one uplink symbol for uplink transmission, and to control the reception of downlink radio signals and the transmission of uplink radio signals based on the determination.

[0019] In one aspect, the uplink radio signal includes the Physical Uplink Control Channel (PUCCH), and the processor can determine that transmission of the Physical Uplink Control Channel is available when the number of uplink symbols is a predetermined number or more, or when the sum of the number of uplink symbols and the number of flexible symbols is a certain number or more.

[0020] On the other hand, when the number of symbols required for the transmission of the physical uplink control channel (hereinafter, symbols for PDCCH transmission) is greater than the number of uplink symbols or the sum of the number of uplink symbols and the number of flexible symbols, the processor may control to discard the physical uplink control channel, convert the physical uplink control channel to another type of physical uplink control channel that requires fewer symbols, or transmit the physical uplink control channel in at least one time slot after the time slot.

[0021] On the other hand, the uplink radio signal includes the Physical Uplink Control Channel (PUCCH), and HARQ-ACK is mapped to the PUCCH. When downlink symbols overlap with symbols used for PDCCH transmission, the processor can determine that HARQ-ACK transmission is unavailable or postpone HARQ-ACK transmission.

[0022] On the other hand, the downlink radio signals include the Physical Downlink Shared Channel (PDSCH) or the Physical Downlink Control Channel (PDCCH), and the processor can determine that the transmission of the Physical Downlink Shared Channel or the Physical Downlink Control Channel is available when the number of downlink symbols is a predetermined number or more, or when the sum of the number of downlink symbols and the number of flexible symbols is equal to a certain number or more.

[0023] On the other hand, downlink radio signals are downlink control information (DCI) included in the physical downlink control channel (PDCCH), and the types of downlink control information include HARQ-ACK, rank indicator (RI), and CSI. The processor can determine whether the reception of downlink radio signals is available based on priority according to the type of downlink control information.

[0024] On the other hand, the downlink radio signals include the SS / PBCH block, and the uplink radio signals may include at least one of the physical uplink control channel, the physical uplink common channel, and the physical random access channel (PRACH).

[0025] On the other hand, when the transmission of uplink radio signals begins after a predetermined number of gap symbols from the last symbol of the downlink symbols used for the transmission of downlink radio signals, the processor can perform the transmission of uplink radio signals.

[0026] On the other hand, when the transmission of an uplink radio signal overlaps with at least one of the last symbol and a predetermined number of gap symbols in the downlink symbols used for the transmission of the downlink radio signal, the processor may discard the transmission of the uplink radio signal.

[0027] In another aspect, the time slot is configured by information about the time slot configuration provided by the base station, and the time slot configuration information may include at least one of cell-specific RRC messages generated in the RRC layer, UE-specific RRC messages, and dynamic time slot format information generated in the physical layer.

[0028] According to another aspect of the present invention, a method for transmitting and receiving radio signals by a terminal in a wireless communication system is provided. The method includes determining whether transmission of uplink radio signals or reception of downlink radio signals allocated to the terminal is available; and controlling the transmission of uplink radio signals or reception of downlink radio signals based on a determination in a time slot configured to include at least one of at least one downlink symbol for downlink transmission, at least one flexible symbol, and at least one uplink symbol for uplink transmission.

[0029] On one hand, the uplink radio signal includes the Physical Uplink Control Channel (PUCCH), and control may include transmitting the Physical Uplink Control Channel when the number of uplink symbols is a predetermined number or more, or when the sum of the number of uplink symbols and the number of flexible symbols is a certain number or more.

[0030] On the other hand, when the number of symbols required for the transmission of the physical uplink control channel (hereinafter, symbols for PDCCH transmission) is greater than the number of uplink symbols or the sum of the number of uplink symbols and the number of flexible symbols, control may include: discarding the physical uplink control channel, converting the physical uplink control channel to another type of physical uplink control channel that requires fewer symbols, or transmitting the physical uplink control channel in at least one time slot after the time slot.

[0031] On the other hand, the uplink radio signal includes the Physical Uplink Control Channel (PUCCH), and HARQ-ACK is mapped to the PUCCH, and control may include: determining that HARQ-ACK transmission is unavailable or delaying HARQ-ACK transmission when downlink symbols overlap with symbols used for PDCCH transmission.

[0032] On the other hand, downlink radio signals include a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and control may include transmitting the physical downlink shared channel or the physical downlink control channel when the number of downlink symbols is a predetermined number or more, or when the sum of the number of downlink symbols and the number of flexible symbols is equal to a certain number or more.

[0033] On the other hand, downlink radio signals are downlink control information (DCI) included in the physical downlink control channel (PDCCH), and the types of downlink control information include HARQ-ACK, rank indicator (RI), and CSI. Control can determine whether the reception of downlink radio signals is available based on priority according to the type of downlink control information.

[0034] On the other hand, the downlink radio signals include the SS / PBCH block, and the uplink radio signals may include at least one of the physical uplink control channel, the physical uplink common channel, and the physical random access channel (PRACH).

[0035] On the other hand, when the transmission of uplink radio signals begins after a predetermined number of gap symbols from the last symbol of the downlink symbols used for the transmission of downlink radio signals, the control may include: transmitting uplink radio signals.

[0036] On the other hand, when the transmission of an uplink radio signal overlaps with at least one of the last symbol and a predetermined number of gap symbols in the downlink symbols used for the transmission of the downlink radio signal, the control may include: dropping the transmission of the uplink radio signal.

[0037] In another aspect, the time slot is configured by information about the time slot configuration provided by the base station, and the time slot configuration information may include at least one of cell-specific RRC messages generated in the RRC layer, UE-specific RRC messages, and dynamic time slot format information generated in the physical layer.

[0038] According to another aspect of the present invention, a terminal for performing uplink transmission and downlink reception in a wireless communication system is provided. The terminal includes: a communication module configured to transmit uplink radio signals to a base station or receive downlink radio signals from a base station; and a processor configured to determine whether, in a time slot in which at least one of a downlink symbol, a flexible symbol, and an uplink symbol for uplink transmission is configured, transmission of uplink radio signals or reception of downlink radio signals is valid, and to perform transmission of uplink radio signals or reception of downlink radio signals based on the determination.

[0039] In one aspect, when the transmission of the uplink radio signal begins in a time slot after the first symbol of the symbols to which the uplink radio signal is assigned, following a predetermined number of symbols from the last symbol of the downlink symbol or the symbol assigned for the reception of the downlink radio signal.

[0040] On the other hand, when the first symbol of an uplink radio signal is assigned to in a time slot overlaps with at least one of a downlink symbol, a symbol assigned for receiving downlink radio signals, or a predetermined number of symbols following the last symbol of the downlink radio signal, the processor may not perform uplink radio signal transmission.

[0041] On the other hand, the uplink radio signal includes at least one of the physical uplink control channel, physical uplink shared channel, physical random access channel, and sounding reference signal (SRS).

[0042] On the other hand, at least one of the symbols to which the uplink radio signal is assigned can be a flexible symbol.

[0043] On the other hand, the downlink radio signal may include at least one of the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, Physical Downlink Shared Channel, Physical Downlink Control Channel, or Channel State Information Reference Signal (CSI-RS).

[0044] On the other hand, the unexecuted uplink radio signal is a physical uplink control channel, and the processor can convert the physical uplink control channel into another type of physical uplink control channel in which transmission is valid in the time slot, and transmit the other type of physical uplink control channel, or execute transmission in the first of a plurality of time slots in which transmission is valid after the time slot.

[0045] On one hand, when the last symbol of the downlink radio signal allocated in the time slot ends before a predetermined number of symbols from the uplink symbols or the first symbol allocated for the transmission of the uplink radio signal, the processor can perform the reception of the downlink radio signal.

[0046] On the other hand, when the last symbol of the downlink radio signal allocated in a time slot overlaps with at least one of the following: an uplink symbol, a symbol allocated for the transmission of the uplink radio signal, or a predetermined number of symbols preceding the first symbol of the uplink radio signal, the processor may not perform downlink radio signal reception.

[0047] On the other hand, the downlink radio signal may include at least one of the physical downlink shared channel, the physical downlink control channel, or the channel state information reference signal (CSI-RS).

[0048] On the other hand, at least one of the symbols to which the downlink radio signal is assigned can be a flexible symbol.

[0049] On the other hand, the uplink radio signal can be a physical random access channel.

[0050] On the other hand, time slots are configured using information about time slot configuration provided by the base station, and the information about time slot configuration may include at least one of cell-specific RRC messages generated in the RRC layer, UE-specific RRC messages, or dynamic time slot format information generated in the physical layer.

[0051] According to another aspect of the present invention, a method is provided for a terminal to perform uplink transmission and downlink reception in a wireless communication system. The method includes determining whether transmission of an uplink radio signal or reception of a downlink radio signal is valid in a time slot in which at least one of a downlink symbol, a flexible symbol, and an uplink symbol for uplink transmission is configured, and performing uplink radio signal transmission or downlink radio signal reception based on the determination.

[0052] In one aspect, the transmission of an uplink radio signal can be performed when, in a time slot, the transmission of an uplink radio signal begins after a predetermined number of symbols following the last symbol of a downlink symbol or a symbol allocated for the reception of a downlink radio signal.

[0053] On the other hand, when the first symbol of an uplink radio signal is assigned to in a time slot overlaps with at least one of a downlink symbol, a symbol assigned to receive the downlink radio signal, or a predetermined number of symbols following the last symbol of the downlink radio signal, the transmission of the uplink radio signal may not be performed.

[0054] On the other hand, the uplink radio signal includes at least one of the physical uplink control channel, physical uplink shared channel, physical random access channel, and sounding reference signal (SRS).

[0055] On the other hand, at least one of the symbols to which the uplink radio signal is assigned can be a flexible symbol.

[0056] On the other hand, the downlink radio signal may include at least one of the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, Physical Downlink Shared Channel, Physical Downlink Control Channel, or Channel State Information Reference Signal (CSI-RS).

[0057] On the other hand, the unexecuted uplink radio signal is a physical uplink control channel, and the physical uplink control channel can be converted into another type of physical uplink control channel in which transmission is valid in a time slot and transmitted, or it can be transmitted in the first time slot among the time slots in which transmission is valid after that time slot.

[0058] On one hand, when the last symbol of the downlink radio signal is assigned to in a time slot ends before the first symbol of the uplink symbol or the symbol assigned for the transmission of the uplink radio signal, the reception of the downlink radio signal can be performed.

[0059] On the other hand, when the last symbol of the downlink radio signal assigned to a time slot overlaps with at least one of the following symbols: an uplink symbol, a symbol assigned for the transmission of the uplink radio signal, or a predetermined number of symbols preceding the first symbol of a symbol, downlink radio signal reception may not be performed.

[0060] On the other hand, the downlink radio signal may include at least one of the physical downlink shared channel, the physical downlink control channel, or the channel state information reference signal (CSI-RS).

[0061] On the other hand, at least one of the symbols to which the downlink radio signal is assigned can be a flexible symbol.

[0062] On the other hand, the uplink radio signal can be a physical random access channel.

[0063] On the other hand, time slots are configured using information about time slot configuration provided by the base station, and the information about time slot configuration may include at least one of cell-specific RRC messages generated in the RRC layer, UE-specific RRC messages, or dynamic time slot format information generated in the physical layer.

[0064] Beneficial effects

[0065] According to the present invention, even if the time slot configuration changes, the terminal can still send PUCCH, thereby preventing PUCCH transmission loss or unnecessary PUCCH retransmission. Furthermore, by defining effective timing for uplink signals such as PRACH, the network's frequency efficiency can be increased and the terminal's energy consumption reduced.

[0066] The effects that can be obtained from the various embodiments of this disclosure are not limited to those described above, and other effects not mentioned above can be clearly deduced and understood by those skilled in the art based on the following description. Attached Figure Description

[0067] Figure 1 This diagram illustrates an example of a wireless frame structure used in a wireless communication system.

[0068] Figure 2 This diagram illustrates an example of a downlink (DL) / uplink (UL) time slot structure in a wireless communication system.

[0069] Figure 3 This is a schematic diagram used to explain the physical channels used in the 3GPP system and the typical signal transmission methods using these physical channels;

[0070] Figure 4 illustrates the SS / PBCH block used for initial cell access in a 3GPP NR system;

[0071] Figure 5 illustrates the process of transmitting control information and control channels in a 3GPP NR system;

[0072] Figure 6 The diagram shows the control resource set (CORESET) that can be used to transmit the Physical Downlink Control Channel (PUCCH) in a 3GPP NR system.

[0073] Figure 7 The diagram illustrates a method for configuring the PDCCH search space in a 3GPP NR system.

[0074] Figure 8 This is a conceptual diagram illustrating carrier aggregation;

[0075] Figure 9 This is a schematic diagram used to explain signal carrier communication and multi-carrier communication;

[0076] Figure 10 This is a schematic diagram illustrating an example of applying cross-carrier scheduling technology;

[0077] Figure 11 This is a diagram illustrating the time slot configuration of a TDD-based mobile communication system.

[0078] Figure 12 is a diagram illustrating the Physical Uplink Control Channel (PUCCH) used in a wireless communication system according to an example.

[0079] Figure 13 This is a diagram illustrating the method of sending PUCCH in a time slot.

[0080] Figure 14 is a diagram illustrating an example of sending PUCCH to another time slot as the time slot configuration changes.

[0081] Figure 15 is a diagram illustrating the time slots for sending repeated PUCCHs according to the time slot configuration.

[0082] Figure 16 shows whether PUCCH is sent according to the time slot configuration.

[0083] Figure 17 These are block diagrams illustrating the configurations of a terminal and a base station according to embodiments of the present invention. Detailed Implementation

[0084] The terminology used in this specification employs general terms that are currently used as broadly as possible in consideration of the functionality of this invention, but these terms may be modified according to the intent, practice, and emergence of new technologies of those skilled in the art. Furthermore, in certain cases, there are terms arbitrarily chosen by the applicant, and in such cases, their meaning will be described in the corresponding descriptive section of the invention. Therefore, the purpose of disclosing the terminology used in this specification is to analyze it not only based on its name, but also on the substantive meaning of the terms and content within the specification.

[0085] Throughout the specification and subsequent claims, when describing an element as "connected" to another element, the element may be "directly connected" to the other element or "electrically connected" to the other element via a third element. Furthermore, unless explicitly stated otherwise, the word "comprising" will be understood to imply the inclusion of the stated elements but does not exclude any other elements, unless otherwise stated. Additionally, in some exemplary embodiments, limitations based on specific thresholds such as "greater than or equal to" or "less than or equal to" may be appropriately replaced with "greater than" or "less than," respectively.

[0086] The following technologies can be used in various wireless access systems, such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier-FDMA (SC-FDMA). CDMA can be implemented using wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA can be implemented using wireless technologies such as those evolved from Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate (EDGE) GSM. OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA), and LTE Advanced (A) is an evolved version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A and is intended to support Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low-Latency Communications (URLLC), and Massive Machine-Type Communications (mMTC) services, as required by IMT-2020. For clarity, 3GPP NR is described primarily, but the technical concept of this invention is not limited thereto.

[0087] Unless otherwise specified in this specification, "base station" may refer to the next-generation node B (gNB) as defined in 3GPP NR. Furthermore, unless otherwise explained, "terminal" may refer to the user equipment (UE).

[0088] Figure 1 This diagram illustrates an example of a wireless frame structure used in a wireless communication system. (Reference) Figure 1 In 3GPP NR systems, radio frames (or radio frames) can have a duration of 10ms (Δf). max N f / 100) T c Additionally, a radio frame consists of 10 subframes (SF) of equal size. Here, Δf max =480 10 3 Hz, N f =4096, T c =1 / (Δf ref N f,ref ), Δf ref =15 10 3 Hz, and N f,ref =2048. Numbers from 0 to 9 can be assigned to the 10 subframes within a radio frame. Each subframe has a length of 1 ms and can include one or more time slots depending on the subcarrier spacing. More specifically, in 3GPP NR systems, the usable subcarrier spacing is 15. 2 μ The subcarrier spacing can be configured as μ = 0, 1, 2, 3, or 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for subcarrier spacing. A subframe of 1 ms length can include 2... μ There are 2 time slots. In this case, the length of each time slot is 2. -μ ms. From 0 to 2 μ-1 The numbers can be assigned to 2 within a subframe. μ One time slot. Additionally, 0 to 10 2 μ The number -1 can be assigned to a time slot within a subframe. Time resources can be distinguished by at least one of the radio frame number (also known as the radio frame index), the subframe number (also known as the subframe index), and the time slot number (or time slot index).

[0089] Figure 2 This diagram illustrates an example of a downlink (DL) / uplink (UL) timeslot structure in a wireless communication system. Specifically, Figure 2 This illustrates the structure of the resource grid in a 3GPP NR system. Each antenna port has its own resource grid. (Reference) Figure 2 A time slot comprises multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also refers to a symbol section. Unless otherwise stated, an OFDM symbol may be simply referred to as a symbol. In the following, and in this specification, the term "symbol" includes OFDM symbols, SC-FDMA symbols, DFTs-OFDM symbols, etc.

[0090] refer to Figure 2 The signal transmitted from each time slot can be composed of N size,μ grid,x N RB sc Subcarriers and N slot symb A resource grid representation of OFDM symbols. Here, when the signal is a DL signal, x = DL, and when the signal is a UL signal, x = UL. size,μ grid,x This represents the number of resource blocks (RBs) that form μ (where x is DL or UL) based on the subcarrier spacing, and N slot symb This indicates the number of OFDM symbols in the time slot. N RB sc N is the number of subcarriers that make up an RB and N RB sc =12. According to the multiple access scheme, OFDM symbols can be called cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform extended OFDM (DFT-s-OFDM) symbols.

[0091] The number of OFDM symbols included in a time slot can vary depending on the length of the cyclic prefix (CP). For example, with a normal CP, a time slot includes 14 OFDM symbols, but with an extended CP, a time slot may include 12 OFDM symbols. In certain embodiments, the extended CP may be used only with a 60 kHz subcarrier spacing. Figure 2 In this example, for ease of description, one time slot is configured with 14 OFDM symbols; however, embodiments of the invention can be applied in a similar manner to time slots with different numbers of OFDM symbols. (See references) Figure 2 Each OFDM symbol includes N in the frequency domain. size , μ grid, x N RB sc Subcarriers. Subcarriers can be categorized into data subcarriers for data transmission, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0092] An RB can be located as N in the frequency domain. RB sc There are N (e.g., 12) consecutive subcarriers. For reference, a resource configured with one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, an RB can be configured with N slot symb N RB sc There are rc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) in a time slot. k can be from 0 to N in the frequency domain. size,μ grid, x N RB sc – 1 is the assigned index, and l can be from 0 to N in the time domain. slot symb – 1. The index assigned.

[0093] In order for the UE to receive signals from or send signals to the base station, the UE's time / frequency can be synchronized with the base station's time / frequency. This is because when the base station and the UE are synchronized, the UE can determine the time and frequency parameters required to demodulate the DL signal and transmit the UL signal at the correct time.

[0094] Each symbol of a radio frame used in Time Division Duplex (TDD) or unpaired spectrum can be configured with at least one of DL symbols, UL symbols, and flexible symbols. Radio frames used as DL carriers in Frequency Division Duplex (FDD) or paired spectrum can be configured with either DL symbols or flexible symbols, while radio frames used as UL carriers can be configured with either UL symbols or flexible symbols. In a DL symbol, DL transmission is possible, but UL transmission is not. In a UL symbol, UL transmission is possible, but DL transmission is not. A flexible symbol can be determined to be used as either DL or UL based on the signal.

[0095] Information regarding the type of each symbol—that is, information representing any one of DL symbols, UL symbols, and flexible symbols—can be configured with cell-specific or public Radio Resource Control (RRC) signals. Additionally, information regarding the type of each symbol can be further configured with UE-specific or dedicated RRC signals. The base station uses cell-specific RRC signals to notify i) the period of the cell-specific time slot configuration, ii) the number of time slots containing only DL symbols starting from the beginning of the cell-specific time slot configuration period, iii) the number of DL symbols starting from the first symbol of the time slot immediately preceding a time slot containing only DL symbols; iv) the number of time slots containing only UL symbols starting from the end of the cell-specific time slot configuration period; and v) the number of UL symbols starting from the last symbol of the time slot immediately preceding a time slot containing only UL symbols. Here, a symbol not configured with either UL or DL ​​symbols is a flexible symbol.

[0096] When information about symbol type is configured in a UE-specific RRC signal, the base station can transmit a flexible symbol, either a DL symbol or a UL symbol from a cell-specific RRC signal. In this case, the UE-specific RRC signal cannot change the DL or UL symbol configured in the cell-specific RRC signal to another symbol type. The UE-specific RRC signal can transmit the corresponding N of each time slot. slot symb The number of DL symbols in each symbol, and the N of the corresponding time slot. slot symb The number of UL symbols in a given symbol. In this case, the DL symbols of a time slot can be configured consecutively from the first symbol of the time slot to the i-th symbol. Alternatively, the UL symbols of a time slot can be configured consecutively from the j-th symbol of the time slot to the last symbol (where i < j). In a time slot, a symbol that is not configured with either a UL symbol or a DL symbol is a flexible symbol.

[0097] The type of symbol configured with the aforementioned RRC signal can be referred to as a semi-static DL / UL configuration. In a previously configured semi-static DL / UL configuration with RRC signals, a flexible symbol can be indicated by a DL symbol, UL symbol, or flexible symbol through Dynamic Slot Format Information (SFI) transmitted on the Physical DL Control Channel (PDCCH). In this case, the DL symbol or UL symbol configured with RRC signals will not change to another symbol type. Table 1 illustrates the dynamic SFIs that the base station can indicate to the UE.

[0098] [Table 1]

[0099]

[0100] In Table 1, D represents the DL symbol, U represents the UL symbol, and X represents the flexible symbol. As shown in Table 1, a maximum of two DL / UL switchings are allowed in one time slot.

[0101] Figure 3 This is a schematic diagram used to explain the physical channels used in 3GPP systems (e.g., NR) and typical signal transmission methods using those physical channels. If the UE is powered on or camped in a new cell, the UE performs an initial cell search (S101). Specifically, the UE can synchronize with the base station (BS) during the initial cell search. To do this, the UE can receive the primary synchronization signal (PSS) and secondary synchronization signal (SSS) from the base station to synchronize with it and obtain information such as the cell ID. Afterward, the UE can receive the physical broadcast channel from the base station and obtain broadcast information within the cell.

[0102] After completing the initial cell search, the UE receives the physical downlink shared channel (PDSCH) based on the physical downlink control channel (PDCCH) and the information in the PDCCH, so that the UE can obtain more specific system information than the system information obtained through the initial cell search (S102).

[0103] When a UE initially accesses a base station or does not have radio resources for signal transmission, the UE can perform a random access procedure on the base station (operations S103 to S106). First, the UE can send a preamble via the Physical Random Access Channel (PRACH) (S103) and receive a response message for the preamble from the base station via the PDCCH and the corresponding PDSCH (S104). When the UE receives a valid random access response message, the UE sends data, including the UE's identifier, to the base station via the Physical Uplink Shared Channel (PUSCH) indicated by the UL license sent from the base station via the PDCCH (S105). Next, the UE waits to receive the PDCCH as an indication from the base station for conflict resolution. If the UE successfully receives the PDCCH via its identifier (S106), the random access procedure terminates.

[0104] Following the above process, the UE receives the PDCCH / PDSCH (S107) and transmits the Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) (S108) as part of the regular UL / DL signal transmission process. Specifically, the UE can receive Downlink Control Information (DCI) via the PDCCH. The DCI may include control information, such as resource allocation information for the UE. Furthermore, the format of the DCI may vary depending on its intended use. The Uplink Control Information (UCI) that the UE transmits to the base station via the UL includes DL / UL ACK / NACK signals, Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), Rank Indicator (RI), etc. Here, CQI, PMI, and RI may be included in Channel State Information (CSI). In 3GPP NR systems, the UE can transmit control information such as HARQ-ACK and CSI as described above via the PUSCH and / or PUCCH.

[0105] Figure 4 illustrates the SS / PBCH block for initial cell access in a 3GPP NR system. When power is turned on or when the UE wants to access a new cell, it can obtain time and frequency synchronization with the cell and perform an initial cell search procedure. The UE can detect the physical cell identifier N of the cell during the cell search procedure. cell IDTo this end, the UE can receive synchronization signals from the base station, such as the primary synchronization signal (PSS) and secondary synchronization signal (SSS), and synchronize with the base station. In this case, the UE can obtain information such as the cell identifier (ID).

[0106] refer to Figure 4a The following section will describe synchronization signals (SS) in more detail. Synchronization signals can be classified into PSS and SSS. PSS can be used to obtain time-domain synchronization and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. SSS can be used to obtain frame synchronization and cell group ID. (Reference) Figure 4a According to Table 2, the SS / PBCH block can be configured with 20 consecutive RBs (= 240 subcarriers) on the frequency axis and 4 consecutive OFDM symbols on the time axis. In this case, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol via subcarriers 56 to 182, and the SSS is transmitted in the third OFDM symbol. Here, the lowest subcarrier index of the SS / PBCH block is numbered starting from 0. In the first OFDM symbol where the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers (i.e., subcarriers 0 to 55 and 183 to 239). Similarly, in the third OFDM symbol where the SSS is transmitted, the base station does not transmit signals via subcarriers 48 to 55 and 183 to 191. The base station transmits the Physical Broadcast Channel (PBCH) via the remaining REs other than the signals described above in the SS / PBCH block.

[0107] [Table 2]

[0108]

[0109] The SS allows the total of 1008 unique physical layer cell IDs to be divided into 336 physical layer cell identifier groups through the combination of three PSS and SSS. Each group includes three unique identifiers. Specifically, each physical layer cell ID is only a part of a physical layer cell identifier group. Therefore, the physical layer cell ID N cell ID = 3N (1) ID + N (2) ID It can be determined by an index N ranging from 0 to 335, which indicates the physical layer cell identifier group. (1) ID and an index N indicating the range of physical layer identifiers in the physical layer cell identifier group from 0 to 2. (2) IDUniquely defined. The UE can detect the PSS and identify one of three unique physical layer identifiers. Additionally, the UE can detect the SSS and identify one of 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d of the PSS... PSS (n) is shown in Equation 1 below.

[0110] [Equation 1]

[0111]

[0112] Here, 0 ≦ n < 127, and x(m) is as shown in equations 2 and 3 below.

[0113] [Equation 2]

[0114]

[0115] [Equation 3]

[0116]

[0117] In addition, the sequence d of SSS sss (n) is shown in Equation 4.

[0118] [Equation 4]

[0119]

[0120] Here, 0 ≦ n < 127, and x0(m) and x1(m) are as shown in equations 5 and 6 below.

[0121] [Equation 5]

[0122]

[0123] [Equation 6]

[0124]

[0125] A radio frame with a length of 10 ms can be divided into two half-frames with a length of 5 ms each. (Reference) Figure 4b This will describe the time slots in which SS / PBCH blocks are transmitted in each half-frame. The time slots in which SS / PBCH blocks are transmitted can be any of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz, and the start time of the SS / PBCH block is ({2, 8} + 14). (n) symbols. In this case, n = 0 or 1 at carrier frequencies of 3 GHz or lower. Furthermore, at carrier frequencies above 3 GHz and below 6 GHz, it can be n = 0, 1, 2, or 3. In case B, the subcarrier spacing is 30 kHz, and the start time of the SS / PBCH block is {4, 8, 16, 20} + 28. n. In this case, at carrier frequencies of 3 GHz or lower, n = 0. Additionally, at carrier frequencies above 3 GHz and below 6 GHz, it may be n = 0 or 1. In case C, the subcarrier spacing is 30 kHz, and the start time of the SS / PBCH block is at ({2, 8} + 14). (n) symbols. In this case, n = 0 or 1 at carrier frequencies of 3 GHz or lower. Furthermore, at carrier frequencies above 3 GHz and below 6 GHz, it can be n = 0, 1, 2, or 3. In case D, the subcarrier spacing is 120 kHz, and the start time of the SS / PBCH block is the ({4, 8, 16, 20} + 28)th symbol. (n) symbols. In this case, at a carrier frequency of 6 GHz or higher, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In case E, the subcarrier spacing is 240 kHz, and the start time of the SS / PBCH block is the ({8, 12, 16, 20, 32, 36, 40, 44} + 56th symbol. (n) symbols. In this case, at a carrier frequency of 6 GHz or higher, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0126] Figure 5 illustrates the process of transmitting control information and the control channel in a 3GPP NR system. (Reference) Figure 5aThe base station can add a Cyclic Redundancy Check (CRC) (e.g., XOR operation) to the control information (e.g., downlink control information (DCI)) masked by the Radio Network Temporary Identifier (RNTI) (S202). The base station can scramble the CRC using the RNTI value determined according to the purpose / objective of each control information. The common RNTI used by one or more UEs can include at least one of System Information RNTI (SI-RNTI), Paging RNTI (P-RNTI), Random Access RNTI (RA-RNTI), and Transmit Power Control RNTI (TPC-RNTI). In addition, UE-specific RNTIs can include at least one of Cell Temporary RNTI (C-RNTI), CS-RNTI, or MCS-C-RNTI. Thereafter, the base station can perform rate matching according to the amount of resources used for PDCCH transmission after performing channel coding (e.g., polarity coding) (S206). Thereafter, the base station can multiplex the DCI based on the PDCCH structure based on the Control Channel Element (CCE) (S208). Additionally, the base station can apply additional processing (S210) such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI, and then map the DCI to the resources to be transmitted. A CCE is the basic resource unit used for a PDCCH, and a CCE can include multiple (e.g., six) Resource Element Groups (REGs). A REG can be configured with multiple (e.g., 12) REs. The number of CCEs used for a PDCCH can be defined as the aggregation level. In 3GPPNR systems, aggregation levels of 1, 2, 4, 8, or 16 can be used. Figure 5b This is a schematic diagram related to CCE aggregation level and PDCCH multiplexing, and illustrates the type of CCE aggregation level used for a PDCCH and the CCEs sent in the control area according to it.

[0127] Figure 6The diagram illustrates a control resource set (CORESET) where the Physical Downlink Control Channel (PUCCH) can be transmitted in a 3GPP NR system. A CORESET is a time-frequency resource in which the PDCCH (i.e., the UE's control signal) is transmitted. Additionally, a search space, described later, can be mapped to a CORESET. Therefore, the UE can monitor the time-frequency domain designated as a CORESET instead of monitoring all frequency bands used for PDCCH reception and decode the PDCCH mapped to the CORESET. The base station can configure one or more CORESETs for each cell to the UE. A CORESET can be configured with up to three consecutive symbols on the time axis. Alternatively, a CORESET can be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of Figure 5, CORESET #1 is configured with consecutive PRBs, while CORESET #2 and CORESET #3 are configured with discontinuous PRBs. A CORESET can reside in any symbol within a time slot. For example, in the embodiment of Figure 5, CORESET#1 starts from the first symbol of the time slot, CORESET#2 starts from the fifth symbol of the time slot, and CORESET#9 starts from the ninth symbol of the time slot.

[0128] Figure 7 The diagram illustrates a method for setting up a PDCCH search space in a 3GPP NR system. Each core may have at least one search space to transmit PDCCHs to a UE. In embodiments of this disclosure, a search space is the set of all time-frequency resources (hereinafter, PDCCH candidates) through which a UE's PDCCH can be transmitted. The search space may include a common search space that requires common searching by UEs in 3GPP NR, and a terminal-specific or UE-specific search space that requires searching by a specific UE. In a common search space, a UE may monitor the configured PDCCHs so that all UEs belonging to the same base station cell can search them together. Alternatively, a UE-specific search space may be set up for each UE, allowing the UE to monitor the PDCCHs allocated to each UE based on its different search space location. In the case of a UE-specific search space, the search spaces between UEs can partially overlap and be allocated due to the limited control area in which PDCCHs can be allocated. Monitoring the PDCCH includes blind decoding of PDCCH candidates in the search space. When blind decoding is successful, it can indicate that the PDCCH was detected / received (successfully), and when blind decoding fails, it can indicate that the PDCCH was not detected / received or was not successfully detected / received.

[0129] For ease of explanation, a PDCCH that sends DL control information to one or more UEs by scrambling with a Group Common (GC) RNTI previously known to the UE is referred to as a Group Common (GC) PDCCH or a Common PDCCH. Conversely, a PDCCH that sends UL scheduling information or DL ​​scheduling information to a specific UE by scrambling with a Specific Terminal RNTI already known to the specific UE is referred to as a Specific UE PDCCH. Common PDCCHs can be included in the common search space, and UE-specific PDCCHs can be included in either the common search space or the UE-specific PDCCH.

[0130] The base station can use the PDSCH to send information (i.e., DL clearance) regarding resource allocation for the Paging Channel (PCH) and Downlink Shared Channel (DL-SCH) as transport channels, or information (i.e., UL clearance) regarding resource allocation for the UL-SCH and Hybrid Automatic Repeat Request (HARQ). The base station can also use the PDSCH to transmit PCH and DL-SCH transport blocks. Furthermore, the base station can use the PDSCH to transmit data that does not include specific control information or specific service data. Additionally, the UE can use the PDSCH to receive data that does not include specific control information or specific service data.

[0131] The base station can include information in the PDCCH about which UE (one or more UEs) the PDSCH data is sent to and how the corresponding UE receives and decodes the PDSCH data, and then transmit the PDCCH. For example, suppose the DCI sent to a particular PDCCH is a CRC of an RNTI masked with "A", and the DCI indicates the radio resources (e.g., frequency location) to which the PDSCH is allocated ("B") and the transmission format information (e.g., block size, modulation scheme, coding information, etc.) to which "C" is indicated. The UE uses the RNTI information it possesses to monitor the PDCCH. In this case, if there is a UE performing blind decoding of the PDCCH via the "A" RNTI, then that UE receives the PDCCH and uses the received PDCCH information to receive the PDSCH indicated by "B" and "C".

[0132] Table 3 shows an example of the Physical Uplink Control Channel (PUCCH) used in a wireless communication system.

[0133] [Table 3]

[0134]

[0135] PUCCH can be used to send the following UL control information (UCI).

[0136] - Scheduling Request (SR): Information used to request UL UL-SCH resources.

[0137] -HARQ-ACK: A response to the PDCCH (indicating DL SPS release) and / or to a DL transport block (TB) on the PDSCH. HARQ-ACK indicates whether information transmitted on the PDCCH or PDSCH has been received. HARQ-ACK responses include positive ACK (simple ACK), negative ACK (hereinafter referred to as NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. Typically, ACK can be represented by a bit value of 1, while NACK can be represented by a bit value of 0.

[0138] - Channel State Information (CSI): Feedback information about the DL channel. The UE generates feedback information about the DL channel based on the CSI reference signal (RS) transmitted by the base station. Feedback information related to Multiple-Input Multiple-Output (MIMO) includes the Rank Indicator (RI) and the Precoding Matrix Indicator (PMI). Based on the information indicated by the CSI, the CSI can be divided into CSI Part 1 and CSI Part 2.

[0139] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, channel environments, and frame structures.

[0140] PUCCH format 0 is a format capable of transmitting 1 or 2 bits of HARQ-ACK information or SR. PUCCH format 0 can be transmitted using one or two OFDM symbols on the time axis and one RB on the frequency axis. When transmitting PUCCH format 0 over two OFDM symbols, the same sequence on both symbols can be transmitted via different RBs. Through this, the UE can obtain frequency diversity gain. More specifically, the UE can... bit Bit UCI (M) bit = 1 or 2) to determine the cyclic shift value m cs Furthermore, it can send a basic sequence of length 12 cyclically shifted to a predetermined value m by mapping the sequence to an OFDM symbol and 12 REs of a PRB. cs The sequence. When the number of cyclic shifts available to the terminal is 12 and M bit When = 1, one bit UCI 0 and 1 can be represented by a sequence of two cyclic shifts with a difference of 6 in the cyclic shift values. Additionally, in M... bit In the case of 2, the 2-bit UCI 00, 01, 11 and 10 can be represented by a sequence of four cyclic shifts corresponding to a difference of 3 in the cyclic shift values.

[0141] PUCCH format 1 can transmit 1 or 2 bits of HARQ-ACK information or SR. PUCCH format 1 can be transmitted via consecutive OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 can be one from 4 to 14. More specifically, it can be used for M... bit = 1 UCI is used for BPSK modulation. The UE can use Quadrature Phase Shift Keying (QPSK) to modulate M. bit = 2 UCI. The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a sequence of length 12. The UE extends the PUCCH format 1 by allocating even-numbered OFDM symbols to transmit the obtained signal using a time-axis orthogonal cover code (OCC). The PUCCH format 1 determines the maximum number of different UEs multiplexed in a RB based on the length of the OCC used. The demodulation reference signal (DMRS) can be extended along with the OCC and mapped to odd-numbered OFDM symbols of the PUCCH format 1.

[0142] PUCCH Format 2 can transmit more than 2 bits of UCI. PUCCH Format 2 can be transmitted via one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH Format 2 is transmitted in two OFDM symbols, the sequences transmitted in different RBs through the two OFDM symbols can be identical. In this way, the UE can obtain frequency diversity gain. More specifically, M... bit UCI (M) bits bit > 2) Scrambled to bit level, QPSK modulated, and mapped to one or two OFDM symbols by RBs. Here, the number of RBs can be one from 1 to 16.

[0143] PUCCH format 3 or PUCCH format 4 can transmit more than 2 bits of UCI. PUCCH format 3 or PUCCH format 4 can be transmitted using consecutive OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 can be one of 4 to 14. Specifically, the UE uses π / 2 binary phase shift keying (BPSK) or QPSK modulation. bit UCI of 2 bits (Mbit > 2) to generate complex numerical symbols d(0) to d(M symb -1). Here, when using π / 2-BPSK, M symb = M bit However, when using QPSK, M symb = M bit / 2. The UE may not apply block cell extension to PUCCH format 3. However, the UE may apply block cell extension to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length 12, allowing PUCCH format 4 to have two or four multiplexing capabilities. The UE performs transmit precoding (or DFT precoding) on ​​the extended signal and maps it to each RE to transmit the extended signal.

[0144] In this scenario, the number of Reference Blocks (RBs) used by PUCCH format 2, PUCCH format 3, or PUCCH format 4 can be determined based on the length of the UCI sent by the UE and the maximum coding rate. When the UE uses PUCCH format 2, it can send HARQ-ACK and CSI information together via PUCCH. When the number of RBs that the UE can send exceeds the maximum number of RBs that can be used with PUCCH format 2, PUCCH format 3, or PUCCH format 4, the UE can send only the remaining UCI information and omit some UCI information based on the priority of the UCI information.

[0145] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured via RRC signals to indicate frequency hopping in time slots. When configuring frequency hopping, the index of the RB to be hopped can be configured with an RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols on the time axis, the first transition may have a lower limit of (N / 2) OFDM symbols and the second transition may have an upper limit of (N / 2) OFDM symbols.

[0146] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured to be repeatedly transmitted across multiple time slots. In this case, the K time slots for repeated PUCCH transmission can be configured via an RRC signal. The repeatedly transmitted PUCCH must begin with an OFDM symbol at a constant position within each time slot and have a constant length. When one OFDM symbol in the time slot where the UE should transmit the PUCCH is indicated as a DL symbol via an RRC signal, the UE can choose not to transmit the PUCCH in the corresponding time slot and delay its transmission to the next time slot.

[0147] In 3GPP NR systems, a UE can perform transmission / reception using a bandwidth equal to or less than the carrier (or cell) bandwidth. For this purpose, the UE can receive a bandwidth portion (BWP) of a continuous bandwidth configured with some bandwidth of the carrier bandwidth. A UE operating under TDD or in unpaired spectrum can receive up to four DL / UL BWP pairs on a single carrier (or cell). Additionally, a UE can activate one DL / UL BWP pair. A UE operating under FDD or in paired spectrum can receive up to four DL BWPs on a DL carrier (or cell) and up to four ULBWPs on a UL carrier (or cell). The UE can activate one DL BWP and one UL BWP for each carrier (or cell). Apart from the activated BWPs, the UE may not perform reception or transmission in the time-frequency resources. The activated BWP can be referred to as the active BWP.

[0148] The base station can indicate the active BWPs among those configured by the UE in the downlink control information (DCI). The BWP indicated by the DCI is activated, and other configured BWPs are deactivated. In a TDD-operated carrier (or cell), the base station can include a bandwidth portion indicator (BPI) in the DCI used for scheduling PDSCH or PUSCH, which indicates the BWP to be activated to change the UE's DL / UL BWP pair. The UE can receive the DCI used for scheduling PDSCH or PUSCH and can identify the DL / UL BWP pair activated based on the BPI. For a DL carrier (or cell) operating in FDD, the base station can include a BPI indicating the BWP to be activated in the DCI used for scheduling PDSCH to change the UE's DL BWP. For a UL carrier (or cell) operating in FDD, the base station can include a BPI indicating the BWP to be activated in the DCI used for scheduling PUSCH to change the UE's UL BWP.

[0149] Figure 8 This is a conceptual diagram illustrating carrier aggregation. Carrier aggregation is a method in which a UE uses multiple frequency blocks or cells (logically) configured with UL resources (or component carriers) and / or DL ​​resources (or component carriers) as a large logical band to enable the wireless communication system to use a wider bandwidth. However, in the following text, for ease of description, the term "component carrier" will be used.

[0150] refer to Figure 8 As an example of a 3GPP NR system, the entire system bandwidth can include up to 16 component carriers, and each component carrier can have a bandwidth of up to 400MHz. Component carriers can include one or more physically contiguous subcarriers. Although in Figure 8The diagram shows each component carrier with the same bandwidth, but this is merely an example, and each component carrier can have a different bandwidth. Furthermore, although each component carrier is shown as adjacent to each other on the frequency axis, the diagram is shown conceptually, and each component carrier can be physically adjacent to each other or can be spaced apart.

[0151] Different center frequencies can be used for each component carrier. Alternatively, a common center frequency can be used in physically adjacent component carriers. Assuming that... Figure 8 In one embodiment, all component carriers are physically adjacent, and center frequency A can be used in all component carriers. Alternatively, assuming the component carriers are not physically adjacent, center frequency A and center frequency B can be used in each component carrier.

[0152] When extending the entire system bandwidth through carrier aggregation, the bandwidth used for communication with each UE can be defined on a component carrier basis. UE A can use 100 MHz as the entire system bandwidth and perform communication using all five component carriers. UEs B1-B5 can only use 20 MHz of bandwidth and perform communication using one component carrier. UEs C1 and C2 can use 40 MHz of bandwidth and perform communication using two component carriers each. These two component carriers can be logically / physically adjacent or non-adjacent. UE C1 represents the case of using two non-adjacent component carriers, and UE C2 represents the case of using two adjacent component carriers.

[0153] Figure 9 This is a diagram used to explain signal carrier communication and multi-carrier communication. Specifically, Figure 9 (a) shows the single-carrier subframe structure and Figure 9 (b) shows the multi-carrier subframe structure.

[0154] refer to Figure 9 In (a) of the FDD mode, a typical wireless communication system can perform data transmission or reception using a DL band and a corresponding UL band. In another specific embodiment, in TDD mode, the wireless communication system can divide radio frames into UL time units and DL time units in the time domain, and perform data transmission or reception using the UL / DL time units. (See reference...) Figure 9 (b) Three 20MHz component carriers (CCs) can be aggregated into each of the UL and DL, enabling a bandwidth of 60MHz. Each CC can be adjacent to or not adjacent to each other in the frequency domain. Figure 9(b) illustrates a case where the bandwidth of the UL CC and the DL CC are the same and symmetrical, but the bandwidth of each CC can be determined independently. Furthermore, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CCs allocated / configured to a specific UE via RRC can be referred to as the serving DL / UL CCs for that specific UE.

[0155] A base station can perform communication with a UE by activating some or all of its serving CCs or deactivating some CCs. The base station can change the CCs to be activated / deactivated, and can also change the number of CCs to be activated / deactivated. If the base station allocates CCs available to the UE as cell-specific or UE-specific, at least one of the allocated CCs can be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. A CC that is not deactivated by the UE is called the primary CC (PCC) or primary cell (PCell), and CCs that the base station can freely activate / deactivate are called secondary CCs (SCCs) or secondary cells (SCells).

[0156] Meanwhile, 3GPP NR uses the concept of cells to manage radio resources. A cell is defined as a combination of DL resources and UL resources, i.e., a combination of DL CC and UL CC. A cell can be configured with DL resources alone, or a combination of DL and UL resources. When carrier aggregation is supported, the link between the carrier frequencies of DL resources (or DL ​​CC) and UL resources (or UL CC) can be indicated through system information. The carrier frequency refers to the center frequency of each cell or CC. The cell corresponding to a PCC is called a PCell, and the cell corresponding to an SCC is called an SCell. The carrier corresponding to a PCell in the DL is DLPCC, and the carrier corresponding to a PCell in the UL is UL PCC. Similarly, the carrier corresponding to an SCell in the DL is DLSCC, and the carrier corresponding to an SCell in the UL is UL SCC. Depending on the UE's capabilities, a serving cell can be configured with one PCell and zero or more SCells. For UEs in the RRC_CONNECTED state but not configured for carrier aggregation or not supporting carrier aggregation, only one serving cell with only a PCell is configured.

[0157] As mentioned above, the term "cell" used in carrier aggregation is distinguished from the term "cell" referring to a specific geographical area where communication services are provided by a base station or an antenna array. To differentiate between a cell referring to a geographical area and a cell in carrier aggregation, in this disclosure, a cell in carrier aggregation is referred to as a CC, and a cell in a geographical area is referred to as a cell.

[0158] Figure 10This is a schematic diagram illustrating an example of cross-carrier scheduling technology. When cross-carrier scheduling is set up, the control channel transmitted via the first CC can use the Carrier Indicator Field (CIF) to schedule the data channel transmitted via either the first CC or the second CC. The CIF is included in the DCI. In other words, a scheduling cell is set up, and the DL license / UL license transmitted in the PDCCH area of ​​the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, there is a search area for multiple component carriers in the PDCCH area of ​​the scheduling cell. The PCell can essentially be the scheduling cell, and a specific SCell can be designated as the scheduling cell by the upper layer.

[0159] exist Figure 10 In this embodiment, it is assumed that three DL CCs are combined. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCCs (or SCells). Additionally, it is assumed that the DL PCC is set as a PDCCH monitoring CC. When cross-carrier scheduling is not configured via UE-specific (or UE group-specific or cell-specific) higher-layer signaling, CIF is disabled, and each DL CC can only send a PDCCH for scheduling the PDSCH of a DL CC that does not have CIF according to the NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). Meanwhile, if cross-carrier scheduling is configured via UE-specific (or UE group-specific or cell-specific) higher-layer signaling, CIF is enabled, and a specific CC (e.g., DL PCC) can send not only a PDCCH for scheduling the PDSCH of DL CC A using CIF but also a PDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling). On the other hand, no PDCCH is sent in another DL CC. Therefore, the UE depends on whether it is configured to monitor PDCCH excluding CIF to receive PDSCH funded by carrier scheduling, or to monitor PDCCH including CIF to receive PDSCH funded by carrier scheduling.

[0160] on the other hand, Figure 9 and Figure 10 The diagram illustrates the subframe structure of a 3GPP LTE-A system, and the same or similar configuration can be applied to a 3GPP NR system. However, in a 3GPP NR system, Figure 9 and Figure 10 Subframes can be replaced by time slots.

[0161] In this invention, when a cell is configured with a normal cyclic prefix (CP), the number of symbols included in a time slot is 14, while when a cell is configured with an extended CP, the number of symbols included in a time slot is 12. However, for ease of description, seven symbols are assumed and described.

[0162] Figure 11 This is a diagram illustrating the time slot configuration of a TDD-based mobile communication system.

[0163] refer to Figure 11 Four time slot configurations can be defined, such as time slot only-DL (DL-only), time slot DL-centric (DL-symbol-centered), time slot UL-centric (UL-symbol-centered), and time slot only-UL (UL-only).

[0164] A time slot can include seven symbols. Gaps may exist when switching from downlink to uplink, or vice versa. That is, gaps can be inserted between downlink and uplink, or between uplink and downlink. A symbol can be used to transmit downlink control information. In the following text, the symbol constituting a gap will be referred to as a gap symbol.

[0165] A time slot that includes only DL symbols (DL-only) literally means that it contains only DL symbols. For example, a time slot that includes only DL symbols contains seven DL symbols, as shown in the figure. Figure 11 The only -DL (DL-only) is shown.

[0166] A time slot centered on a DL symbol includes multiple DL symbols, at least one gap symbol, and at least one UL symbol. For example, a time slot centered on a DL symbol could sequentially include five DL symbols, one gap symbol, and one UL symbol, such as... Figure 11 The DL-centric is shown.

[0167] A UL-centric time slot centered on a UL symbol includes at least one DL symbol, at least one gap symbol, and multiple UL symbols. For example, a UL-centric time slot could sequentially include one DL symbol, one gap symbol, and five UL symbols, such as... Figure 11 As shown in the UL-centric diagram.

[0168] A UL-only time slot includes only the UL symbol, literally meaning only the UL symbol. For example, a UL-only time slot includes seven UL symbols, such as... Figure 11 As shown in UL-only.

[0169] The network can notify the terminal of the default time slot configuration and can use RRC signaling for it. Information about the default time slot configuration set by RRC signaling can be referred to as semi-static DL / UL allocation information. The default time slot configuration is the time slot configuration that the terminal can assume the network uses when the base station does not send signaling to the terminal for individual time slot configuration changes. 3GPP NR systems support dynamic TDD, which can change the time slot configuration according to various service states of the terminal. For this purpose, the base station can notify the terminal of the current or future time slot configuration in each time slot, every few time slots, or each time the base station changes the time slot configuration. Two methods can be used in the NR system to notify the terminal of the time slot configuration.

[0170] The first method is to use a group common PDCCH. A group common PDCCH is a PDCCH broadcast to multiple terminals and can be sent in every time slot, every few time slots, or only when needed by the base station. The group common PDCCH may include a (dynamic) time slot format information indicator (SFI) to send information about the time slot configuration, and this SFI can indicate the current time slot configuration in which the group common PDCCH is sent, or indicate multiple future time slot configurations including the current time slot configuration. When a group common PDCCH is received, the terminal can know the current time slot configuration or the future time slot configuration including the current time slot through the time slot configuration information indicator included in the group common PDCCH. If the reception of the group common PDCCH fails, the terminal cannot determine whether the base station sent the group common PDCCH.

[0171] The second method involves sending information about time slot configuration in a UE-specific PDCCH used for scheduling PDSCH or PUSCH. The UE-specific PDCCH can be unicast only to the specific user requiring scheduling. The UE-specific PDCCH can send the same time slot format information indicator as that sent in the group common PDCCH as the time slot configuration information for the scheduled time slot. Alternatively, the UE-specific PDCCH can include information that allows inference of the configuration of the scheduled time slot. For example, a terminal can learn the time slot to which the PDSCH or PUSCH is allocated and the position of the OFDM symbol within that time slot by receiving the UE-specific PDCCH assigned to the terminal, and infer the time slot configuration from this. Furthermore, the UE-specific PDCCH scheduling PDSCH can indicate the time slot in which the PUCCH, including HARQ-ACK feedback information, is transmitted and the position of the OFDM symbol within that time slot, from which the configuration of the time slot in which the PUCCH is transmitted can be deduced.

[0172] In the following description, downlink signals are radio signals transmitted from a base station to a terminal, and may include physical downlink channels, sequences, reference signals (DM-RS, CSI-RS, TRS, PT-RS, etc.) generated and processed in the physical layer, MAC messages and RRC messages (or RRC signaling) generated and processed in the MAC and RRC layers respectively. MAC messages and RRC messages may be referred to as higher-layer signaling to distinguish them from the signals of the physical layer, which constitutes the lower layers of the OSI model. Here, downlink physical channels may further include downlink physical shared channel (PDSCH), downlink physical control channel (PDCCH), and physical broadcast channel (PBCH).

[0173] Furthermore, the uplink signals used in this specification are radio signals transmitted from the terminal to the base station, and may include physical uplink channels, sequences, reference signals (SRS, etc.) generated and processed at the physical layer, as well as MAC messages and RRC messages (or RRC signaling) generated and processed at the MAC layer and RRC layer, respectively. Here, the uplink physical channels may again include the uplink physical shared channel (PUSCH), the uplink physical uplink control channel (PUCCH), and the physical random access channel (PRACH).

[0174] Figure 12 is a diagram illustrating the Physical Uplink Control Channel (PUCCH) used in a wireless communication system according to an example.

[0175] Referring to Figure 12, the 3GPP NR system can use two types of PUCCH depending on the size of the time resources (i.e., the number of symbols) used for PUCCH transmission.

[0176] Type 1 PUCCH, also known as Long PUCCH, can be transmitted using four or more consecutive symbols mapped to time slots. Type 1 PUCCH is primarily used to transmit large amounts of Uplink Control Information (UCI) or is assigned to users with low signal strength, thus increasing PUCCH coverage. Additionally, Type 1 PUCCH can be repeatedly transmitted across multiple time slots to further increase PUCCH coverage. Type 1 PUCCH can include: PUCCH format 1, transmitting 1 or 2 bits of UCI; PUCCH format 3, transmitting more than 2 bits of UCI while not supporting multiplexing between users; and PUCCH format 4, transmitting more than 2 bits of UCI while supporting multiplexing between users.

[0177] Type II PUCCH, also known as Short PUCCH, can be mapped to one or two symbols in a time slot and transmitted. It can be used to transmit a small number of UCIs, or allocated to users with high signal strength, and can also be used to support services requiring low latency. Type II PUCCH can include PUCCH format 0 for transmitting 1 or 2 bits of UCI and PUCCH format 2 for transmitting more than 2 bits of UCI.

[0178] Within a time slot, there may be time-frequency resources available for Type 1 PUCCH and Time-Frequency Resources available for Type 2 PUCCH, and these can be allocated to different terminals or to a single terminal. When allocated to a single terminal, Type 1 and Type 2 PUCCHs can be transmitted in different time resources (i.e., different OFDM symbols). That is, when allocated to a single terminal, Type 1 and Type 2 PUCCHs can be transmitted via Time Division Multiplexing (TDM).

[0179] The UCI mapped to the PUCCH can include Scheduling Grant (SR), HARQ-ACK, Rank Information (RI), CSI, and Beam-Related Information (BI). SR informs the base station of the presence of uplink transmission. HARQ-ACK informs the base station of the successful reception of the Physical Downlink Shared Channel (PDSCH). RI informs the rank information that can be transmitted via the radio channel when multiple antennas are used. CSI informs the value measuring the channel condition between the base station and the terminal. BI informs the base station of beamforming information related to the transmitter and receiver.

[0180] refer to Figure 12a A time slot centered on a DL symbol (DL-center) can be configured and indicated using five DL symbols, one flexible symbol, and one UL symbol. A second type PUCCH with a first symbol length can be assigned to a time slot centered on a DL symbol. The second type PUCCH can be located in the last symbol of the time slot.

[0181] refer to Figure 12b The illustrated UL-centered time slot can be configured and indicated using one DL symbol, one flexible symbol, and five UL symbols. Type 1 PUCCHs and / or Type 2 PUCCHs can be assigned to the UL-centered time slot. Type 1 PUCCHs can be mapped to four symbols, and Type 2 PUCCHs can be mapped to the last symbol of the time slot.

[0182] refer to Figure 12cType 1 PUCCHs and / or Type 2 PUCCHs can be assigned to time slots containing only UL symbols (UL only). For example, a Type 1 PUCCH can be mapped to six symbols, and a Type 2 PUCCH can be mapped to the last symbol of the time slot.

[0183] refer to Figure 11 As shown in Figure 12, the time slot configurations for transmitting Type 2 PUCCH can be time slots centered on DL symbols, time slots centered on UL symbols, and time slots containing only UL symbols. Similarly, the time slot configurations for transmitting Type 1 PUCCH can be time slots centered on UL symbols and time slots containing only UL symbols. Additionally, the time slots for transmitting both Type 1 and Type 2 PUCCH can be time slots centered on UL symbols and time slots containing only UL symbols via TDM. For reference, since only one symbol is allocated to the uplink in a time slot centered on DL symbols, Type 2 PUCCH can be transmitted, but Type 1 PUCCH cannot. Therefore, the PDCCH scheduling PUCCH can allocate Type 1 PUCCH to time slots centered on UL symbols or time slots containing only UL symbols. Furthermore, the PDCCH scheduling PUCCH can allocate Type 2 PUCCH to time slots centered on DL symbols, time slots centered on UL symbols, or time slots containing only UL symbols.

[0184] As described above, the base station (or network) can change the time slot configuration according to the terminal's services and various circumstances, and can notify the terminal of the corresponding time slot configuration change. Because the time slot configuration can be changed as described above, the terminal should receive the time slot configuration information indicator or information about the time slot configuration by monitoring the group common PDCCH and the UE-specific PDCCH. However, due to issues such as radio channel conditions and interference between the base station and the terminal, the terminal may not be able to receive the group common PDCCH and the UE-specific PDCCH.

[0185] When a terminal fails to receive a group common PDCCH and / or a UE-specific PDCCH, it may be unable to identify whether the base station has changed its time slot configuration. However, if the base station has changed its time slot configuration and the PUCCH transmission scheduled by the terminal is not suitable for the changed time slot configuration, the failure to send the PUCCH may cause problems such as temporary loss of communication or delays if the terminal forces the scheduled PUCCH transmission. Therefore, in this situation, a clear process or preliminary agreement between the terminal and the base station is needed regarding whether the terminal should send or discard the indicated PUCCH, and how to perform the transmission if so.

[0186] For this purpose, embodiments define operating methods for terminals and base stations to address situations where the terminal fails to receive group common PDCCH and / or UE-specific PDCCH, including time slot configuration information indicators and information related to time slot configuration.

[0187] In another embodiment, even if the terminal successfully receives the group common PDCCH and / or UE-specific PDCCH including the time slot configuration information indicator and time slot configuration related information, if the configuration of the time slot to which the PUCCH is allocated (or the scheduled transmission of the PUCCH) is changed and the allocated PUCCH cannot be sent, the terminal for processing the transmission of the PUCCH, its operating method, and the base station for processing the reception of the allocated PUCCH and its operating method are defined.

[0188] [Example]

[0189] First, a method for operating the terminal and base station according to this embodiment will be described. This embodiment achieves predictable communication between the terminal and the base station by imposing certain restrictions on changes to the base station's time slot configuration. In this case, the terminal's PUCCH transmission can be performed regardless of whether the group common PDCCH and UE-specific PDCCH are successfully received.

[0190] Example: The time slot configuration, including the time slots in which the PUCCH is allocated (or will be transmitted), remains the same. Nothing has changed.

[0191] Depending on whether the PUCCH being assigned (or to be sent) is a Type 1 PUCCH or a Type 2 PUCCH, this embodiment can be divided into detailed examples.

[0192] As an example, the time slot configuration of the symbols for which the first type of PUCCH is allocated (or transmitted) remains unchanged. That is, the base station does not change the time slot configuration of the OFDM symbols for which the first type of PUCCH is allocated, and the terminal also assumes (or promises or expects) that the time slot configuration of the OFDM symbols for which the first type of PUCCH is allocated has not been changed. Therefore, the terminal can transmit the first type of PUCCH independently of receiving time slot configuration information indicators and time slot configuration related information transmitted in the group common PDCCH and UE-specific PDCCH.

[0193] As another example, the time slot configuration of the symbols for which the second type of PUCCH is allocated (or to be transmitted) remains unchanged. That is, the base station does not change the time slot configuration of the symbols for which the first type of PUCCH is allocated (or to be transmitted), and the terminal also assumes (or promises or expects) that the time slot configuration of the symbols for which the second type of PUCCH is allocated (to be transmitted) has not been changed. Therefore, the terminal can transmit the second type of PUCCH independently of receiving time slot configuration information indicators and time slot configuration related information transmitted in the group common PDCCH and UE-specific PDCCH.

[0194] As mentioned above, embodiments that prohibit changes to the time slot configuration of base stations may become a limitation in flexible scheduling. To supplement this aspect, embodiments that allow changes to the time slot configuration of base stations within a certain range are disclosed below.

[0195] The time slot configuration of the symbols to which PUCCH is assigned (or to be transmitted) can only be changed within a certain range.

[0196] Even if the time slot configuration of the symbol to which the PUCCH is allocated (or to be transmitted) is changed, the time slot configuration can be changed to a time slot configuration where the PUCCH can be transmitted, but cannot be changed to a time slot configuration where the PUCCH cannot be transmitted. Therefore, the terminal does not expect to change to a time slot where PUCCH transmission is unavailable, relative to the time slot indicated by the base station for PUCCH transmission. This embodiment of this aspect can again be divided into detailed embodiments based on whether the allocated PUCCH is a first type PUCCH or a second type PUCCH.

[0197] For example, even if the time slot configuration of the symbol to which the first type PUCCH is allocated is changed, the base station can change the time slot configuration to one where the first type PUCCH can be transmitted, but cannot change it to one where transmission of the first type PUCCH is unavailable. Therefore, the terminal does not expect to change to a time slot where transmission of the first type PUCCH is unavailable, relative to the time slot indicated by the base station. Even if the terminal fails to receive a group common PDCCH including a time slot configuration information indicator for transmitting the first type PUCCH, the terminal can still always transmit the first type PUCCH to the allocated resources.

[0198] For example, referring to Figure 12, the base station can change the time slot allocated to the first type PUCCH of the fourth OFDM symbol length, which is centered on the UL symbol, to a time slot that only includes the UL symbol, but cannot change the time slot centered on the UL symbol to a time slot that only includes the DL symbol with one UL symbol or a time slot centered on the DL symbol. On the other hand, the terminal may expect to be able to change the time slot allocated to the first type PUCCH of the fourth OFDM symbol length, which is centered on the UL symbol and is indicated by the base station for transmission, to a time slot that only includes the UL symbol, but does not expect to change it to a time slot that only includes the DL symbol or a time slot centered on the DL symbol. In addition, the terminal does not expect a change in the time slot configuration, wherein the UL symbol indicated by the base station for transmitting the first type PUCCH is changed to a DL symbol.

[0199] As another example, even if the time slot configuration of the symbol to which the second type PUCCH is allocated is changed, the base station can change the time slot configuration to one where the second type PUCCH can be transmitted, but cannot change it to one where the transmission of the second type PUCCH is unavailable. Therefore, the terminal does not expect to change to a time slot where the transmission of the second type PUCCH is unavailable, relative to the time slot indicated by the base station for the first type PUCCH transmission. Even if the terminal fails to receive a group common PDCCH including a time slot configuration information indicator for transmitting the second type PUCCH, the terminal can always transmit the second type PUCCH to the allocated resource. More specifically, the base station can change the time slot to which the second type PUCCH is allocated, centered on the UL symbol, to a time slot centered on the DL symbol where the second type PUCCH can be transmitted, or a time slot containing only the UL symbol, but cannot change it to a time slot containing only the DL symbol where the transmission of the second type PUCCH is unavailable. Furthermore, the terminal does not expect the base station to become a time slot where the transmission of the second type PUCCH is unavailable, relative to the time slot indicated for transmitting the second type PUCCH.

[0200] For example, a terminal may expect (or predict) that the time slot allocated to a UL-symbol-centered second-type PUCCH of one or two symbol lengths indicated for transmission by the base station can be changed to a DL-symbol-centered time slot that includes the second-type PUCCH, or a time slot that only includes the UL symbol. However, it does not expect (or predict) that the UL-symbol-centered time slot can be changed to a time slot that only includes the DL symbol and cannot include the second-type PUCCH. Furthermore, the terminal does not expect any change in the time slot configuration where the UL symbol indicated by the base station for transmitting the second-type PUCCH is changed to a DL symbol.

[0201] Compared to the embodiments described above that allow changes in base station time slot configuration within a certain range, an embodiment for increasing scheduling flexibility is disclosed.

[0202] The time slot configuration of the symbols in which the PUCCH is assigned (or to be transmitted) can be freely changed.

[0203] The base station can freely change the configuration of the time slots to which the PUCCH is allocated.

[0204] In the example where the PUCCH is a Type 1 PUCCH, if the terminal fails to receive a Group Common PDCCH that includes a timeslot configuration information indicator for sending the Type 1 PUCCH, the terminal may not send the Type 1 PUCCH to the allocated resource.

[0205] In the example where the PUCCH is a Type 2 PUCCH, if the terminal fails to receive a Group Common PDCCH that includes a timeslot configuration information indicator for sending the Type 2 PUCCH, the terminal may not send the Type 2 PUCCH to the allocated resource.

[0206] According to the above embodiments, even if the terminal fails to receive the group common PDCCH and / or UE-specific PDCCH from the base station, the communication error or delay problem can be solved because the transmission and transmission process of the scheduled PUCCH are clearly defined.

[0207] [Another embodiment]

[0208] Another embodiment of this disclosure relates to the operation process of a terminal and a base station when the time slot configuration of a base station can be freely changed and the terminal successfully receives at least one of a group of common PDCCHs and a UE-specific PDCCH, including a time slot configuration information indicator and time slot configuration related information.

[0209] More specifically, a terminal and its operating method for processing PUCCH transmission are disclosed when the configuration of the time slot to which PUCCH is allocated (or scheduled to transmit PUCCH) is changed, and the changed time slot configuration contradicts the PUCCH (i.e., when the UL symbol allocated to the PUCCH in the time slot to which the PUCCH is allocated overlaps with the DL symbol according to the changed time slot configuration). A base station and its operating method for processing PUCCH reception are also disclosed.

[0210] In a modified timeslot configuration, the transmission of an allocated PUCCH may be available (or valid, or suitable) or may be unavailable (a so-called conflicting timeslot configuration). Here, for example, referring to Figure 12, timeslots capable of transmitting PUCCHs include timeslots centered on UL symbols or timeslots containing only UL symbols allocated to first-type PUCCHs, and timeslots centered on DL symbols or timeslots centered on UL symbols or timeslots containing only UL symbols allocated to second-type PUCCHs. Conversely, timeslots where PUCCHs cannot be transmitted include, for example, cases where the timeslots allocated to first-type PUCCHs are changed to timeslots centered on DL symbols or timeslots containing only DL symbols, or cases where the timeslots allocated to second-type PUCCHs are changed to timeslots containing only DL symbols.

[0211] When the configuration of the time slot indicated for sending PUCCH is changed, if the PUCCH transmission allocated in the changed time slot configuration is available (or valid or suitable), the terminal can perform the scheduled PUCCH transmission in the indicated time slot. However, even if the indicated time slot contradicts the PUCCH transmission due to the configuration change, a special protocol is required between the terminal and the base station to send the scheduled PUCCH. A method for handling PUCCH under contradictory time slot configurations will be described below. Because the information sent to the base station via PUCCH is UCI, the present invention can include embodiments in which the term UCI is used instead of PUCCH in all embodiments of this specification. For example, from the perspective of UCI, the method for handling PUCCH under contradictory time slot configurations corresponds to the method for handling UCI (HARQ-ACK, RI, etc.) under contradictory time slot configurations.

[0212] Methods for processing PUCCH in the indicated time slot

[0213] First, when the assigned PUCCH is a Type 1 PUCCH, the PUCCH handling method under conflicting time slot configurations will be described. (See reference) Figure 3 The described UCIs (HARQ-ACK, RI, CSI, etc.) are mapped to the first type PUCCH.

[0214] In one aspect, a method of processing a PUCCH may include: receiving a group common PDCCH by a terminal, including a time slot configuration information indicator that is indicated to transmit a time slot of a first type of PUCCH, and performing the transmission of a first type of PUCCH or a second type of PUCCH based on conditions according to the examples below.

[0215] As an example, a terminal may transmit a first-type PUCCH in the indicated time slot based on a comparison of the UL symbols configured in the time slot indicated for transmitting the first-type PUCCH with the UL symbols allocated to the transmission of the first-type PUCCH. For instance, if the UL symbols configured in the time slot indicated for transmitting the first-type PUCCH are greater than (or greater than or equal to) the UL symbols required for the transmission of the first-type PUCCH, the terminal transmits the first-type PUCCH to the allocated resources in the time slot.

[0216] As another example, a terminal can transmit a first-type PUCCH or discard or suspend transmission based on a comparison of the UL symbols configured according to the time slot in the time slot indicated for transmitting the first-type PUCCH with the UL symbols required for transmitting the first-type PUCCH. For example, if the UL symbols configured according to the time slot in the time slot indicated for transmitting the first-type PUCCH are less than the UL symbols required for the transmission of the first-type PUCCH, the terminal can discard the transmission of the first-type PUCCH in the indicated time slot. For example, if the time slot indicated for transmitting the PUCCH is multiple time slots, rather than a first time slot in which the transmission of the first-type PUCCH is scheduled, the terminal can postpone the transmission of the first-type PUCCH to a second time slot, which provides the UL symbols required for transmitting the first-type PUCCH. On the other hand, if the time slot indicated for transmitting the PUCCH is a single time slot, the terminal can discard or suspend the scheduled transmission of the first-type PUCCH.

[0217] As another example, a terminal may transmit a first-type PUCCH based on a comparison of the UL symbols, flexible symbols, and UL symbols allocated to the transmission of the first-type PUCCH according to the time slot configuration in the time slot instructed to transmit the first-type PUCCH. For example, if the number of symbols including the UL symbols and flexible symbols according to the time slot configuration in the time slot instructed to transmit the first-type PUCCH is greater than (or greater than or equal to) the number of UL symbols required for the transmission of the first-type PUCCH, the terminal transmits the first-type PUCCH to the allocated resources in the time slot.

[0218] As another example, a terminal can transmit a first-type PUCCH, discard, or suspend transmission based on a comparison of the UL symbols, flexible symbols, and UL symbols used for transmitting the first-type PUCCH in the time slot instructed to transmit the first-type PUCCH. For example, if the number of symbols including the UL symbols and flexible symbols in the time slot instructed to transmit the first-type PUCCH is less than the number of UL symbols required for the transmission of the first-type PUCCH, the transmission of the first-type PUCCH can be discarded in the instructed time slot. For example, if there are multiple time slots instructed to transmit the PUCCH, the terminal can transmit the first-type PUCCH in the time slot that satisfies the number of UL symbols allocated to the transmission of the first-type PUCCH. On the other hand, if there is a single time slot instructed to transmit the PUCCH, the terminal can discard or suspend the scheduled first-type PUCCH transmission.

[0219] On the other hand, the method for processing PUCCH may include: receiving a group common PDCCH and a UE-specific PDCCH by the terminal, indicating a time slot configuration for sending a first type of PUCCH; and sending either a first type of PUCCH or a second type of PUCCH based on conditions. In this case, the terminal may determine whether to send a first type of PUCCH in the indicated time slot based on conditions, as shown in the following example.

[0220] As an example, i) the base station can change the configuration of the time slot to which the first type PUCCH is allocated, ii) the terminal successfully receives the group common PDCCH and the UE-specific PDCCH, which indicate the configuration of the time slot to which the first type PUCCH is allocated, iii) if the time slot configuration is a time slot that can send the first type PUCCH, then the terminal can send the first type PUCCH to the resources allocated to that time slot.

[0221] As another example, i) the base station can change the configuration of the time slot to which the first type PUCCH is allocated, ii) the terminal successfully receives the group common PDCCH and the UE-specific PDCCH indicating the configuration of the time slot to which the first type PUCCH is allocated, but iii) if the time slot configuration is a time slot to which the first type PUCCH cannot be transmitted, the terminal may not perform the transmission of the first type PUCCH in that time slot, or transmit the first type PUCCH corresponding to the changed time slot configuration, or as... Figure 13 The example shown transmits a second type of PUCCH in a time slot instead of a first type of PUCCH. The specific operations of the terminal are shown in Table 4 below.

[0222] [Table 4]

[0223]

[0224]

[0225] As another example, i) the base station can change the configuration of the time slot to which the first type PUCCH is allocated, ii) the terminal successfully receives a group common PDCCH and a UE-specific PDCCH indicating the configuration of the time slot to which the first type PUCCH is allocated, iii) the time slot is configured to be a time slot to which the first type PUCCH can be transmitted, and iv) the PUSCH is allocated to (or scheduled to be transmitted) in that time slot and is configured to transmit both PUCCH and PUSCH simultaneously, and (v) if intermodulation distortion (IMD) may occur due to frequency separation between PUCCH and PUSCH and is configured not to transmit the first type PUCCH, then the terminal performs at least one of the operations according to Table 4 above.

[0226] Next, we will describe the case where the assigned PUCCH is a type 2 PUCCH. (See reference) Figure 3 The described UCIs (HARQ-ACK, RI, CSI, etc.) are mapped to the second type PUCCH.

[0227] In one aspect, a method for processing a PUCCH may include: a terminal receiving a group common PDCCH, the group common PDCCH including a timeslot configuration information indicator for timeslots designated for transmitting a second type of PUCCH; and performing the transmission of the second type of PUCCH based on conditions. In this case, the terminal may determine whether to transmit the second type of PUCCH based on conditions, as shown in the following example.

[0228] As an example, a terminal may transmit a second-type PUCCH based on a comparison of the UL symbols configured in the time slot indicated for transmitting the second-type PUCCH with the UL symbols allocated to the transmission of the second-type PUCCH. For instance, if the UL symbols configured in the time slot indicated for transmitting the second-type PUCCH are greater than (or greater than or equal to) the UL symbols required for the transmission of the second-type PUCCH, the terminal transmits the second-type PUCCH to the allocated resources in that time slot.

[0229] As another example, a terminal can transmit a second-type PUCCH, discard, or suspend transmission based on a comparison of the UL symbols configured in the time slot indicated for transmitting the second-type PUCCH with the UL symbols required for transmitting the second-type PUCCH. For example, if the UL symbols configured in the time slot indicated for transmitting the second-type PUCCH are less than the UL symbols allocated for the transmission of the second-type PUCCH, the transmission of the second-type PUCCH can be discarded in the indicated time slot. For example, if there are multiple time slots indicated for transmitting the PUCCH, the terminal can transmit the second-type PUCCH in a second time slot that meets the number of UL symbols required for the transmission of the second-type PUCCH. On the other hand, if there is a single time slot indicated for transmitting the PUCCH, the terminal can discard or suspend the scheduled second-type PUCCH transmission.

[0230] As another example, a terminal may transmit a second-type PUCCH based on a comparison of the UL symbols, flexible symbols, and UL symbols allocated to the transmission of the second-type PUCCH in the time slot configured according to the time slot in which the second-type PUCCH is instructed to be transmitted. For example, if the number of symbols including the UL symbols and flexible symbols configured according to the time slot in the time slot in which the second-type PUCCH is instructed to be transmitted is greater than (or greater than or equal to) the number of UL symbols required for the transmission of the second-type PUCCH, the terminal transmits the second-type PUCCH to the allocated resources in the time slot.

[0231] As another example, a terminal can transmit a second-type PUCCH, discard, or suspend transmission based on a comparison of the UL symbols, flexible symbols, and the number of UL symbols required for transmitting the second-type PUCCH in the time slot instructed to transmit the second-type PUCCH. For example, if the number of symbols including the UL symbols and flexible symbols in the time slot instructed to transmit the second-type PUCCH is less than the number of UL symbols required for the transmission of the second-type PUCCH, the transmission of the second-type PUCCH can be discarded in the instructed time slot. For example, if there are multiple time slots instructed to transmit the PUCCH, the terminal can transmit the second-type PUCCH in a second time slot that satisfies the number of UL symbols required for the transmission of the second-type PUCCH. On the other hand, if there is a single time slot instructed to transmit the PUCCH, the terminal can discard or suspend the scheduled transmission of the second-type PUCCH.

[0232] Methods for processing PUCCH in time slots different from the indicated time slots

[0233] The PUCCH processing method according to this embodiment may include, when the configuration of the time slot to which the PUCCH is instructed to be transmitted changes, having the terminal perform transmission in another time slot after the instructed time slot. That is, when the UL symbol carrying the PUCCH in the time slot to which the PUCCH is allocated overlaps with the DL symbol in the time slot configured according to the changed time slot, the terminal may postpone or delay the transmission of the PUCCH to another time slot where the PUCCH can be transmitted, instead of the specified time slot.

[0234] In another time slot with a delay, a PUCCH may have the same type as the allocated specific type PUCCH, or a PUCCH of a different type may be sent. In yet another time slot with a delay, a PUCCH of the same type as the allocated specific type PUCCH may be sent, and the time domain allocation used for PUCCH transmission may be different from that of the allocated specific type PUCCH.

[0235] First, when the assigned PUCCH is a Type 1 PUCCH, the PUCCH processing method under conflicting time slot configurations will be described. Here, Type 1 PUCCH may include the above-mentioned references. Figure 3 The UCIs described are specifically HARQ-ACK, RI, CSI, etc. Because the information mapped to the first type of PUCCH is the UCI, this invention can include embodiments in which the term "first type of PUCCH" is replaced by "UCI" in all embodiments of this specification.

[0236] Figure 14 is a diagram illustrating an example of sending a PUCCH to another time slot as the time slot configuration is changed.

[0237] Referring to Figure 14(a), the terminal can identify, by receiving a group common PDCCH and / or a UE-specific PDCCH indicating a change in the slot configuration, that the UL-symbol-centered slot N to which the first type PUCCH (long PUCCH) was allocated has been changed by the base station to a DL-symbol-centered slot configuration in which the first type PUCCH cannot be transmitted. In this case, the terminal can transmit the first type PUCCH in the delayed slot N + K, while not transmitting the first type PUCCH in slot N. That is, in the delayed slot N + K, the first type PUCCH with the same type as the allocated first type PUCCH is transmitted. Here, slot N + K can be the UL-symbol-centered slot that is the nearest slot where the allocated first type PUCCH can be transmitted.

[0238] In other words, even if the base station changes the configuration of the time slot to which the first type PUCCH is allocated and the terminal successfully receives the group common PDCCH and the UE-specific PDCCH including the time slot configuration information, if the time slot is configured to not transmit the first type PUCCH, the terminal may not transmit the first type PUCCH in that time slot, and may transmit the first type PUCCH in the most recent time slot in the subsequent time slot where the first type PUCCH can be transmitted.

[0239] Meanwhile, referring to Figure 14(b), the terminal can identify, by receiving a group common PDCCH and / or a UE-specific PDCCH indicating a change in the slot configuration, that the UL symbol-centered slot N to which the first type PUCCH (long PUCCH) was allocated has been changed by the base station to a slot configuration in which the first type PUCCH cannot be transmitted. In this case, the terminal can transmit the second type PUCCH (short PUCCH) in slot N+K while not transmitting the first type PUCCH in slot N. In the delayed slot N+K, the second type PUCCH, having a different type from the allocated first type PUCCH, is transmitted. That is, in the delayed slot N+K, the second type PUCCH, having a type changed from the allocated first type PUCCH, is transmitted. Here, slot N+K can be a DL symbol-centered slot, as the nearest slot where the second type PUCCH can be transmitted.

[0240] In other words, even if the base station changes the configuration of the time slot to which the first type of PUCCH is allocated, and the terminal successfully receives the group common PDCCH and the UE-specific PDCCH including the time slot configuration information, if the time slot configuration is a time slot that cannot transmit the first type of PUCCH, the terminal may not transmit the first type of PUCCH in that time slot, and subsequently, it may transmit the second type of PUCCH in the most recent time slot in the subsequent time slot that can transmit the second type of PUCCH.

[0241] Here, the UCI sent via the second type of PUCCH may include only a portion of the UCI that is initially scheduled for transmission according to its importance, and may exclude the rest.

[0242] In one aspect, the terminal can transmit some information about the UCI type based on its importance as the UCI type that should initially be transmitted via the first type of PUCCH. As an example, the importance or priority of the UCI type that can be transmitted in the first type of PUCCH can be defined in the order of HARQ-ACK, Rank Information (RI), Channel State Information (CSI), and Beam Related Information (BRI) (e.g., Beam Recovery Request) (HARQ-ACK > RI > CSI > BRI). As another example, the importance or priority of the UCI type that can be transmitted in the first type of PUCCH can be defined in the order of HARQ-ACK, Beam Related Information, RI, and CSI (HARQ-ACK > BRI > RI > CSI). As yet another example, the importance or priority of the UCI type that can be transmitted in the first type of PUCCH can be defined in the order of Beam Related Information, HARQ-ACK, RI, and CSI (BRI > HARQ-ACK > RI > CSI).

[0243] On the other hand, the terminal can send some types of UCIs of high importance via the second type PUCCH based on the amount of UCIs that can be sent via the second type PUCCH.

[0244] On the other hand, when the information to be transmitted in the first type of PUCCH includes information about the primary cell's PCell and the secondary cell's SCell, the terminal can transmit certain information based on the importance or priority between the primary and secondary cells. As an example, the terminal can transmit only the UCI related to the primary cell via the second type of PUCCH. As another example, when the information to be transmitted in the first type of PUCCH includes information about the primary cell or the primary / secondary cell's PSCell, the terminal can transmit only the UCI related to the primary cell or the primary / secondary cell via the second type of PUCCH.

[0245] On the other hand, the terminal can preferentially transmit UCIs for DLs associated with cells that can be transmitted via PUCCH (e.g., DL cells linked to SIBs) on each PUCCH group via a second type of PUCCH.

[0246] On the other hand, the terminal can transmit the second type PUCCH based on the importance between the primary and secondary cells and the importance of the UCI type. As an example, the terminal can transmit a high-priority UCI type via the second type PUCCH among the UCIs related to the primary cell (HARQ-ACK, beam-related information, RI, CSI, etc.). This priority primarily considers the type of the serving cell, excluding the type of UCI to be transmitted via the second type PUCCH. Of course, the type of UCI transmitted via the second type PUCCH can be considered prior to the type of the serving cell. The priority between the serving cell and the UCI can be transmitted by the base station to the terminal through configuration information included in, such as RRC signaling, or it can be defined separately based on the payload size of the second type PUCCH.

[0247] On the other hand, the terminal can transmit only up to a predetermined number of UCI bits via the second type PUCCH, depending on the payload size of the UCI. For example, the terminal can be configured to transmit up to X bits of UCI via the second type PUCCH (where X is {2 <= X <= tens of bits}).

[0248] On the other hand, the terminal can be configured to send up to X bits of HARQ-ACK or BRI via a second-type PUCCH based on a specific type of UCI (i.e., the number of bits of HARQ-ACK or BRI) (where X is {2 <= X <= tens of bits}).

[0249] Methods for handling HARQ-ACK in time slots different from the indicated time slots

[0250] According to one aspect, the HARQ-ACK processing method includes: the base station changing the configuration of the time slot N to which the PUCCH is allocated; the terminal receiving a group common PDCCH and / or a UE-specific PDCCH including information about the changed time slot configuration; and if the allocated PUCCH cannot be sent under the changed time slot configuration (i.e., the changed time slot configuration contradicts the allocated PUCCH), the terminal sending the allocated PUCCH after delaying the HARQ-ACK information from time slot N by K time slots (i.e., N + K).

[0251] Here, according to this embodiment, the "allocated PUCCH" can be either a first-type PUCCH or a second-type PUCCH. Additionally, the K value can be determined based on the time taken by the base station to receive PUCCH feedback during PDSCH scheduling. In time slots where PUCCH can be transmitted after time slot N + K, a PUCCH for HARQ-ACK feedback from another terminal may not be allocated. For example, when a terminal and a base station communicate with each other based on Frequency Division Duplex (FDD), a PUCCH for HARQ-ACK feedback from another terminal (common to 3GPP LTE, LTE-A, and NR) may not be transmitted (or allocated) in time slots transmitted after 4ms. The K value can be provided via RRC signals.

[0252] According to another HARQ-ACK processing method, it may include: the base station changing the configuration of the time slot N to which the first type PUCCH is allocated; the terminal receiving a group common PDCCH and / or a UE-specific PDCCH including information about the changed time slot configuration; and when the first type PUCCH cannot be sent under the changed time slot configuration, but the second type PUCCH can be sent, the terminal waits for the base station to reallocate the PUCCH without sending the first type PUCCH.

[0253] As an example, this method of handling HARQ-ACK may further include: the base station retransmitting the PDSCH to the terminal that does not send a first type PUCCH containing the HARQ-ACK of the PDSCH, and allocating resources for sending the first type PUCCH in the PDCCH that schedules the PDSCH.

[0254] According to another HARQ-ACK processing method, the base station changes the configuration of the time slot N to which the PUCCH is allocated; and if the terminal does not receive a group common PDCCH for transmitting the configuration information of time slot N, but receives a UE-specific PDCCH for scheduling PDSCH (or PUSCH) to learn the time slot configuration of time slot N, the terminal selectively transmits the PUCCH based on the time slot configuration. As an example, if the time slot configuration is one in which the allocated PUCCH can be transmitted, the terminal can transmit the PUCCH. As another example, if the time slot configuration is one in which the allocated PUCCH cannot be transmitted, the terminal may not transmit the PUCCH. Here, the allocated PUCCH can be a first type PUCCH or a second type PUCCH.

[0255] [Another embodiment]

[0256] Another embodiment of this disclosure relates to information about time slot configuration sent by a base station to a terminal, and a method for operating the terminal and the base station based on that information. The base station may use various information and procedures to notify the terminal of the time slot configuration. The information about the time slot configuration may include various embodiments as follows.

[0257] Information regarding time slot configuration

[0258] On one hand, information regarding time slot configuration includes semi-static DL / UL assignment information. As an example, the base station can send a default time slot format or semi-static DL / UL assignment information (or semi-static time slot format information (SFI)) specifically to the terminal cell, and additionally send semi-static DL / UL assignment information to the terminal via a UE-specific RRC message. Upon receiving the semi-static DL / UL assignment information (or default time slot format), the terminal can determine which time slot configuration the time slot has. The semi-static DL / UL assignment information (or default time slot format) indicates whether each symbol in the time slot is a DL symbol, a UL symbol, or a symbol other than DL and UL symbols (or a flexible symbol). Here, the terminal can assume that symbols not indicated with semi-static DL / UL assignment information (or default time slot format) are designated as "unknown (or flexible)".

[0259] On the other hand, information regarding slot configuration includes Dynamic Slot Format Information (SFI) included and transmitted in the Group Common PDCCH. SFI indicates whether each symbol in a slot is a DL symbol, a UL symbol, or a different symbol (unknown or flexible symbol) besides DL and UL symbols. Flexible symbols can substitute for slots and can be used for purposes other than slots. The Group Common PDCCH in which SFI-RNTI is transmitted can be scrambled using SFI-RNTI. Whether a terminal monitors SFI can be configured or indicated by RRC messages. Terminals not indicated to monitor SFI by RRC messages may not receive SFI.

[0260] On the other hand, time slot configuration information can be scheduling information included in the downlink control information (DCI) mapped to a UE-specific PDCCH. For example, if the DCI contains information about the start position and length of the PDSCH, it can be assumed that the symbol scheduled for the corresponding PDSCH is a DL symbol. Similarly, if the DCI contains information about the start position and length of the PUSCH, it can be assumed that the symbol scheduled for the corresponding PUSCH is a UL symbol. Likewise, if the DCI contains information about the start position and length of the PUCCH used for HARQ-ACK transmission, it can be assumed that the symbol scheduled for the corresponding PUCCH is a UL symbol.

[0261] Methods for determining symbol direction and methods for processing PUCCH

[0262] Because of the various information regarding time slot configurations as described above, a terminal can receive information about different types of time slot configurations for the same time slot. Then, the information about each time slot configuration can indicate different symbol directions within the same time slot. In this case, how the terminal and the base station change or determine the symbol direction can follow the rules below.

[0263] On one hand, the DL and UL symbols in the semi-static DL / UL assignment information (or default time slot format) do not change direction through dynamic time slot configuration information or scheduling information. Therefore, if the PUCCH is located in a UL symbol configured by the semi-static DL / UL assignment information (or default time slot format), the terminal can send the PUCCH independently of the dynamic time slot configuration information or scheduling information. If at least one of the symbols to which the PUCCH is assigned overlaps with a DL symbol in the default time slot format, the terminal either does not send the corresponding PUCCH or changes the length of the PUCCH to match the length of the remaining symbols besides the corresponding DL symbol and sends the PUCCH. Here, the assigned PUCCH can be either a first-type PUCCH or a second-type PUCCH.

[0264] On the other hand, the direction of the flexible symbols configured by the semi-static DL / UL assignment information (or default time slot format) can be determined or changed through dynamic time slot configuration information or scheduling information. If at least one of the symbols assigned to the PUCCH overlaps with the flexible symbols of the semi-static DL / UL assignment information (or default time slot format), the terminal can determine whether to send the PUCCH based on the type (HARQ-ACK, RI, CSI, etc.) of the information (i.e., UCI) transmitted via the PUCCH. In this embodiment, the PUCCH can be a first type PUCCH or a second type PUCCH.

[0265] As an example, if the information sent in the PUCCH includes a HARQ-ACK for the PDSCH, the terminal sends the PUCCH at a predetermined location regardless of the dynamic slot configuration information indicated by the group common PDCCH. Here, the determined location is indicated in the DCI that schedules the PDSCH.

[0266] As another example, if the information sent in the PUCCH does not include HARQ-ACK for the PDSCH, the terminal sends the PUCCH when the flexible symbol overlapping with the PUCCH is indicated as a UL symbol by the dynamic timeslot configuration information.

[0267] As another example, if the dynamic timeslot configuration information indicates that at least one of the symbols to which the PUCCH is assigned is a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive the dynamic timeslot configuration information for the symbol to which the PUCCH is assigned, the terminal does not transmit the PUCCH.

[0268] On the other hand, if at least one of the symbols to which the PUCCH is assigned overlaps with a flexible symbol configured by semi-static DL / UL assignment, the terminal can determine whether to send the PUCCH based on the signaling that triggers the transmission of the PUCCH.

[0269] As an example, if a PUCCH is triggered via DCI, the terminal will send the PUCCH at a predetermined location regardless of the dynamic timeslot configuration information. Here, the predetermined location is indicated in the DCI.

[0270] As another example, if a PUCCH is triggered by a UE-specific RRC message, the terminal sends the PUCCH when the symbol to which the PUCCH is assigned is indicated as a UL symbol through dynamic timeslot configuration information.

[0271] As another example, if the dynamic timeslot configuration information indicates that at least one of the symbols to which the PUCCH is assigned is a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive the dynamic timeslot configuration information for the symbol to which the PUCCH is assigned, the terminal does not transmit the PUCCH.

[0272] Methods for handling duplicate PUCCH

[0273] The terminal can repeatedly transmit PUCCH on several time slots. Hereinafter, this PUCCH is referred to as a repeated PUCCH. In this embodiment, the repeated PUCCH can be either a first-type PUCCH or a second-type PUCCH. The base station can configure the number of time slots to transmit the repeated PUCCH to the terminal via RRC messages. Then, in each time slot, the start and end symbols of the PUCCH can be the same for each repeated time slot. Hereinafter, the repeated PUCCH may or may not be transmitted depending on each case of configuring DL symbols, UL symbols, and flexible symbols via RRC such as semi-static DL / UL assignment information (or default time slot mode) and dynamic time slot configuration information. The method for handling the repeated PUCCH in each case will be described below.

[0274] When the repeated PUCCH overlaps with the UL symbol

[0275] If the repeated PUCCH in each time slot indicated for transmission is located in a UL symbol configured with semi-static DL / UL assignment information (or default time slot mode), the terminal can transmit the PUCCH repeatedly in multiple time slots without receiving dynamic time slot configuration information or scheduling information. Here, the DL and UL symbols configured according to the time slots via RRC messages such as semi-static DL / UL assignment information (or default time slot mode) will not change direction due to dynamic time slot configuration information or scheduling information.

[0276] When the repeated PUCCH and DL symbols overlap

[0277] If at least one of the symbols allocated to the repeated PUCCH in each of the time slots in which the repeated PUCCH is transmitted overlaps with a DL symbol according to the semi-static DL / UL assignment information, the terminal does not transmit the PUCCH in the corresponding time slot or transmits the PUCCH by changing the length of the remaining symbols except for the corresponding DL symbol. Alternatively, if at least one of the symbols allocated to the repeated PUCCH in one of the time slots indicated for transmitting the repeated PUCCH overlaps with a DL symbol configured with the semi-static DL / UL assignment information (or the default time slot mode), the terminal does not transmit the repeated PUCCH in the next time slot and in the corresponding time slot.

[0278] When repeating PUCCH overlaps with flexible notation

[0279] If at least one of the symbols to which the repeated PUCCH is assigned in each time slot in which the repeated PUCCH is transmitted overlaps with a flexible symbol configured via semi-static DL / UL allocation, the terminal may determine whether to transmit the repeated PUCCH based on i) the type (HARQ-ACK, RI, CSI, etc.) of the information (i.e., UCI) transmitted via the repeated PUCCH, or ii) the signaling that triggers the PUCCH transmission, or iii) the dynamic time slot configuration information. In this embodiment, the repeated PUCCH may be a first type PUCCH or a second type PUCCH.

[0280] On the one hand, if at least one of the symbols to which the repeated PUCCH is assigned overlaps with a flexible symbol configured via semi-static DL / UL allocation, the terminal can determine whether to send the repeated PUCCH based on the type of information (i.e., UCI) sent via the repeated PUCCH (HARQ-ACK, RI, CSI, etc.).

[0281] As an example, if the information sent via the repeated PUCCH includes a HARQ-ACK for the PDSCH scheduled by the PDCCH, the terminal sends the repeated PUCCH at a predetermined location regardless of the dynamic slot configuration information indicated by the group common PDCCH. Here, the determined location is indicated in the DCI that schedules the PDSCH.

[0282] As another example, if the information sent via the repeated PUCCH does not include a HARQ-ACK for the PDSCH, the terminal sends the repeated PUCCH when the flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by the dynamic timeslot configuration information.

[0283] As another example, if at least one of the symbols to which a repeated PUCCH is assigned is indicated by dynamic time slot configuration information as a different symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit the repeated PUCCH in that time slot. Alternatively, if the terminal fails to receive dynamic time slot configuration information regarding the symbol to which the repeated PUCCH is assigned, the terminal does not transmit the repeated PUCCH in that time slot. Even if the repeated PUCCH is not transmitted in the corresponding time slot, the terminal will still transmit the repeated PUCCH in the next time slot if certain conditions are met (when a flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by dynamic time slot configuration information).

[0284] As another example, if a terminal fails to transmit a duplicate PUCCH in one of the time slots in which it was instructed to transmit a duplicate PUCCH for some reason (a discrepancy in the symbol direction caused by dynamic time slot configuration information, or the terminal's failure to receive dynamic time slot configuration information), the terminal will not perform duplicate PUCCH transmission even in subsequent time slots.

[0285] Meanwhile, on the other hand, if at least one of the symbols to which the repeated PUCCH is assigned overlaps with a flexible symbol configured via semi-static DL / UL assignment, the terminal can determine whether to send the repeated PUCCH based on the signaling that triggers the transmission of the repeated PUCCH.

[0286] As an example, if a repeated PUCCH is triggered via DCI, the terminal sends the repeated PUCCH at a predetermined location regardless of the dynamic timeslot configuration information. Here, the determined location is indicated in the DCI.

[0287] As another example, if a repeated PUCCH is triggered by a UE-specific RRC message, the terminal sends the repeated PUCCH when the symbol to which the repeated PUCCH is assigned is indicated as a UL symbol through dynamic timeslot configuration information.

[0288] As another example, if at least one of the symbols to which a repeated PUCCH is assigned is indicated by dynamic time slot configuration information as a different symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit the repeated PUCCH in that time slot. Alternatively, if the terminal fails to receive dynamic time slot configuration information regarding the symbol to which the repeated PUCCH is assigned, the terminal does not transmit the repeated PUCCH in that time slot. Even if the repeated PUCCH is not transmitted in the corresponding time slot, the terminal will still transmit the repeated PUCCH in the next time slot if certain conditions are met (when a flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by dynamic time slot configuration information).

[0289] As another example, if a terminal does not send a duplicate PUCCH in a time slot for some reason (a discrepancy in symbol direction caused by dynamic time slot configuration information, or the terminal failing to receive dynamic time slot configuration information), the terminal will not perform duplicate PUCCH transmission in subsequent time slots.

[0290] Here, the number K of time slots in which the PUCCH transmission is repeated (or attempted) can be defined as follows.

[0291] As an example, the K time slots configured to transmit repeated PUCCHs do not need to be consecutive. For instance, when a terminal is configured to repeatedly transmit PUCCHs during the K time slots, it can repeatedly transmit PUCCHs until the count of the number of time slots actually transmitted, excluding the time slots where repeated PUCCHs are not transmitted, reaches K. (Repetition Method 1)

[0292] As another example, the K time slots configured to transmit repeated PUCCHs should be consecutive. For instance, when a terminal is configured to repeatedly transmit PUCCHs during K time slots, it can repeatedly transmit PUCCHs until the count of the number of time slots (including those where repeated PUCCHs are not transmitted) reaches K, starting from time slot N, which was instructed to transmit repeated PUCCHs. That is, the terminal that first attempts to transmit a PUCCH in time slot N attempts to transmit a PUCCH until time slot (N + K - 1), and even if the actual number of times (or time slots) of repeated PUCCH transmissions is less than K, the terminal will no longer transmit PUCCHs in time slot (N + K). (Repetition Method 2)

[0293] As another example, the terminal attempts to send a repeated PUCCH in K consecutive time slots, starting from time slot N which is instructed to send a repeated PUCCH, excluding time slots in which PUCCH cannot be sent according to semi-static DL / UL assignment information. (Repetition Method 3)

[0294] Figure 15 is a diagram illustrating the time slots for sending repeated PUCCHs according to the time slot configuration.

[0295] Referring to Figure 15(a), when the terminal is configured to repeatedly transmit Type 1 PUCCH 1500 on two time slots (based on the time slot configuration allocated by the semi-static DL / UL), the terminal transmits Type 1 PUCCH 1500. In this case, the flexible symbols can be changed to DL symbols or UL symbols through dynamic time slot configuration information or scheduling information of the UE-specific DCI. Assume that the symbols transmitting Type 1 PUCCH 1500 in the time slots are symbols 8 to 13. Here, a time slot includes 14 symbols, and the symbol indices are from 0 to 13.

[0296] Reviewing the time slot configuration based on the semi-static DL / UL allocation, symbol 0 in time slot 0 is the DL symbol, and symbols 7 through 13 are UL symbols. In time slot 1, symbols 0 through 10 are DL symbols, and symbols 12 through 13 are UL symbols. In time slot 2, symbols 0 through 1 are DL symbols, and symbols 10 through 13 are UL symbols. In time slot 3, symbol 0 is the DL symbol, and symbols 7 through 13 are UL symbols. All other symbols besides the UL and DL symbols are flexible symbols.

[0297] Therefore, regardless of the dynamic time slot configuration information, the first type PUCCH1500 can be transmitted in time slots 0 and 3, and regardless of the dynamic time slot configuration information, it cannot be transmitted in time slot 1. Furthermore, if symbols 8 and 9 are indicated as UL symbols by the dynamic time slot configuration information, they can be transmitted; otherwise, they cannot be transmitted.

[0298] Figure 15(a) illustrates the time slot in which the terminal attempts to transmit the first type PUCCH 1500 according to the repetition method 1 described above. Here, it is assumed that symbols 8 and 9 of time slot 2 are not indicated as UL symbols through dynamic time slot configuration information, preventing the terminal from transmitting the first type PUCCH. The terminal actually transmits the first type PUCCH 1500 twice, in time slots 0 and 3. Therefore, the terminal no longer retransmits the first type PUCCH 1500 after time slot 3.

[0299] Figure 15(b) illustrates the time slots used to attempt to transmit the first type PUCCH 1500 using the repetition method 2 described above. Because the first type PUCCH 1500 is configured to be repeatedly transmitted in two time slots (K = 2), the terminal attempts to transmit the first type PUCCH 1500 in both time slots 0 and 1. The terminal attempts to transmit the first type PUCCH in time slot 1, but fails to do so because the terminal's configuration based on the semi-static DL / UL assignment information overlaps with the DL symbol.

[0300] Figure 15(c) illustrates a time slot used to attempt to transmit Type 1 PUCCH 1500 using the repetition method 3 described above. Type 1 PUCCH 1500 is configured to be repeatedly transmitted in two time slots (K = 2), but time slot 1 is the time slot where Type 1 PUCCH 1500 cannot be transmitted due to semi-static DL / UL assignment information. Therefore, the terminal attempts to transmit Type 1 PUCCH 1500 in time slots 0 and 2. Here, as indicated by the dynamic time slot configuration information, time slot 2 may or may not actually transmit Type 1 PUCCH 1500.

[0301] [Another embodiment]

[0302] Another embodiment of this disclosure is a method and related determination process for a terminal or base station to transmit physical channels to improve physical channel coverage in a wireless communication system based on time slot configuration including TDD-based DL symbols, flexible symbols, and UL symbols. The physical channels transmitted by the terminal are uplink physical channels and include PRACH, PUCCH, PUSCH, SRS, etc. The physical channels transmitted by the base station are downlink physical channels and include PDSCH, PDCCH, PBCH, etc. Hereinafter, procedures for terminal and base station repetition of PUCCH, PUSCH, and PDSCH repetition methods are defined. In the following embodiments, the PUCCH or repeated PUCCH can be a first type PUCCH or a second type PUCCH.

[0303] PUCCH retransmission process between terminals and base stations

[0304] The number of time slots in which the PUCCH is sent or the number of times the PUCCH transmission is repeated can be one of several predetermined values ​​(i.e., 1, 2, 4, and 8), and the value configured for the actual terminal is sent among these values ​​via an RRC message. If the number of times the PUCCH transmission is repeated is set to 1, it indicates that a normal PUCCH is used instead of a repeated PUCCH.

[0305] The start and length of the symbols transmitted in a time slot's PUCCH are configured by being included in a PUCCH resource configured by RRC parameters. A set of PUCCH resources, including at least one PUCCH resource, can be configured or assigned to a terminal via RRC signaling. Simultaneously, the base station can indicate at least one PUCCH resource index from the PUCCH resource set to the terminal via dynamic signaling (i.e., DCI). For example, the base station can indicate the PUCCH resource index to the terminal based on a PUCCH resource indicator (PRI) included in the DCI, or a combination of PRI and implicit mapping. Here, PRI can be 2 bits or 3 bits.

[0306] In this way, the configured PUCCH resource set or PUCCH resource index can be kept the same across multiple time slots in which PUCCH is repeatedly transmitted. The terminal determines whether to transmit the PUCCH indicated by the DCI. This determination can be based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used for the determination may include at least one of the UL-DL configuration common information TDD-UL-DL-ConfigurationCommon, which can be indicated by RRC signaling, and the additional UL-DL configuration specific information TDD-UL-DL-ConfigDedicated, which can be indicated to the terminal by RRC signaling.

[0307] As an example, the UL-DL configuration public information indicates the period in which semi-static DL / UL assignment information is applied, as well as the number of DL symbols, UL symbols, and flexible symbols configured on multiple time slots included in that period.

[0308] As another example, UL-DL configuration-specific information may include information for overriding flexible symbols in a semi-static DL / UL timeslot configuration provided by UL-DL configuration public information, which includes UL symbols, DL symbols, and flexible symbols. That is, the terminal can override the flexible symbols in the timeslot format provided by the UL-DL configuration public information with a different type of symbol based on the UL-DL configuration-specific information.

[0309] If, in a time slot designated by the base station for PUCCH transmission, the symbol to be transmitted overlaps with a symbol indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration private information), the terminal determines whether to transmit the PUCCH based on the direction of the indicated symbol.

[0310] As an example, if the indicated symbol is a DL symbol, the terminal postpones the transmission of PUCCH to the next time slot, and if one of the indicated symbols is a UL symbol and a flexible symbol, the terminal transmits PUCCH in the corresponding time slot.

[0311] As another example, if the indicated symbol is a DL symbol or a flexible symbol, the terminal postpones the transmission of the PUCCH to the next time slot, and if the indicated symbol is a UL symbol, the terminal transmits the PUCCH in the corresponding time slot. A PUCCH not transmitted in the corresponding time slot can be postponed to the next time slot.

[0312] The terminal repeatedly transmits PUCCH across multiple time slots until the number of repetitions configured by the RRC message for PUCCH transmission is reached. When determining the time slots for transmitting PUCCH across multiple time slots, the terminal can consider UL symbols and unknown (or flexible) symbols based on information transmitted in the RRC message. As an example, the terminal can determine the time slots included in the UL symbols and flexible symbols, where the number of PUCCH start positions and UL symbols is configured by the RRC message, as the time slot resources for performing PUCCH transmission. The base station can receive PUCCHs in which the terminal performs repeated transmissions across multiple time slots based on at least one of UL-DL configuration public information and UL-DL configuration private information.

[0313] If at least one of the symbols for transmitting PUCCH in the first time slot of a time slot allocated to which repeated PUCCH transmission is assigned overlaps with a DL symbol, the terminal cancels the PUCCH transmission and does not transmit PUCCH in that time slot. That is, if the symbols for transmitting PUCCH in the first time slot of a time slot allocated to which repeated PUCCH transmission is assigned consist of UL symbols and flexible symbols, the terminal can transmit PUCCH in the corresponding time slot. If at least one of the symbols for transmitting PUCCH in the first time slot of a time slot allocated to which repeated PUCCH transmission is assigned overlaps with a DL symbol, the terminal cancels the PUCCH transmission and does not transmit PUCCH in that time slot. That is, if the time slot for PUCCH transmission indicated by the base station and the symbols of that time slot are configured with UL symbols, i.e., symbols indicated for transmitting PUCCH, the terminal can transmit PUCCH in the corresponding time slot.

[0314] The PUCCH processing method associated with the gap symbol is disclosed below.

[0315] There may be a gap between the DL and UL symbols due to DL-UL handover. This gap can be located within flexible symbols. That is, some symbols in the flexible symbols between the DL and UL symbols can be used for the DL-UL handover gap and may not be used for DL ​​reception or UL transmission. Let G be the number of symbols used for the gap. G can be fixed to a specific value, such as 1 or 2, which can be configured in the terminal via an RRC message or obtained via a timing advance value.

[0316] If, in each time slot indicated by the base station for PUCCH transmission, the symbol to be transmitted overlaps with a symbol configured by semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration private information), the terminal determines whether to transmit the PUCCH based on the type (or direction) of the indicated symbol.

[0317] As an example, if all the indicated symbols are UL symbols, the terminal sends a PUCCH; and if at least one of the indicated symbols consists of a DL symbol or one of G consecutive Flex symbols immediately following a DL symbol, the terminal does not send a PUCCH in the corresponding time slot. The terminal may defer a PUCCH that was not sent in the corresponding time slot to the next time slot.

[0318] In other words, in a time slot designated by the base station for PUCCH transmission, if the symbol to be transmitted in that time slot is a UL symbol, the terminal transmits the PUCCH; and if the symbol to be transmitted overlaps with at least one of a DL symbol or at least one of the G consecutive Flex symbols immediately following the DL symbol, the terminal does not transmit the PUCCH in that time slot. The terminal can postpone the PUCCH not transmitted in the corresponding time slot to the next time slot. That is, when overlapping with any of the DL symbol and the G symbols used as gaps, the PUCCH can be omitted, and transmission can be postponed to the next time slot.

[0319] Meanwhile, regarding the PUCCH processing method in multiple time slots, the terminal repeatedly transmits the PUCCH until the number of repetitions of PUCCH transmission configured by the RRC message on multiple time slots is reached. The terminal can determine the time slots for transmitting the PUCCH on multiple time slots based on the type and number of symbols of the information sent in the RRC message.

[0320] The terminal determines the time slot for PUCCH transmission based on the number of UL symbols, the number of flexible symbols, and the number of gap symbols configured by the semi-static UL / DL assignment information. For example, when the "number of UL symbols + number of flexible symbols - number of gap symbols" in a time slot includes the start position of the PUCCH and the number of UL symbols to be transmitted, the terminal can determine the corresponding time slot as the time slot for transmitting the PUCCH and transmit the PUCCH. Alternatively, when considering that a time slot includes 14 symbols, if "14 - (number of DL symbols in the time slot + number of gap symbols)" includes the start position of the PUCCH and the number of UL symbols to be transmitted, the terminal can determine the corresponding time slot as the time slot for transmitting the PUCCH and transmit the PUCCH.

[0321] In this scenario, the base station can receive PUCCH, where the terminal performs repeated transmissions across multiple time slots based on at least one of UL-DL configuration public information and UL-DL configuration private information.

[0322] Figure 16 shows whether PUCCH is sent according to the time slot configuration.

[0323] Referring to Figure 16, the time slot configuration based on the semi-static DL / UL assignment information includes five DL symbols (represented as "D"), three flexible symbols (represented as "X"), and six UL symbols (represented as "U").

[0324] PUCCH allocation #0 is configured with PUCCH resources from symbols 8 to 14, PUCCH allocation #1 is configured with PUCCH resources from symbols 7 to 14, and PUCCH allocation #3 is configured with PUCCH resource symbols from symbols 6 to 14.

[0325] First, Figure 16(a) illustrates the case where symbol G = 1 is provided as the gap. If G = 1, PUCCH allocation #0 and PUCCH allocation #1 can be transmitted without overlapping with a flexible symbol immediately following the DL symbol, but PUCCH allocation #2, which overlaps with a flexible symbol immediately following the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH allocation #2 can be postponed to the next time slot. Of course, the terminal also determines whether to transmit PUCCH allocation #2 in the next time slot based on the same criteria.

[0326] First, Figure 16(b) illustrates the case where two symbols (G = 2) are used as a gap. If G = 2, PUCCH allocation #0 can be transmitted without overlapping with two consecutive or flexible symbols immediately following the DL symbol, but PUCCH allocation #1 and PUCCH allocation #2, which overlap with two consecutive flexible symbols immediately following the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH allocation #1 and #2 can be postponed to the next time slot. Of course, the terminal also determines whether to transmit PUCCH allocation #1 and #2 in the next time slot based on the same criteria.

[0327] Terminal and base station processes for repeatedly transmitting PUCCH

[0328] The number of time slots in which PUSCH is sent or the number of times PUCCH is repeated can be one of several predetermined values ​​(i.e., 1, 2, 4, and 8), and the value configured for the actual terminal can be sent via an RRC message. If the number of times PUSCH is repeated is set to 1, it indicates that a normal PUSCH will replace the repeated PUSCH.

[0329] In the case of PUSCH, PUSCH is sent only in the slot configuration suitable for PUSCH transmission among K consecutive slots, and no delay operation is performed for PUSCH transmission.

[0330] The start and length of the symbols in which the PUSCH is transmitted within a time slot are indicated by the DCI and can remain the same across all time slots. The terminal determines whether to transmit the PUSCH indicated by the DCI. This determination can be based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used for the determination may include at least one of the UL-DL configuration common information TDD-UL-DL-ConfigurationCommon, which can be indicated by RRC signaling, and the additional UL-DL configuration specific information TDD-UL-DL-ConfigDedicated, which can be indicated to the terminal by RRC signaling.

[0331] As an example, UL-DL configuration public information indicates the period for applying semi-static DL / UL assignment information and is used to configure the slot format and number of slots. This slot format is configured with the number of UDL symbols, the number of DL / UL symbols, and the number of flexible symbols per slot configured across multiple slots included in the period. That is, the terminal can configure the slot format for each slot based on the number of slots indicated by the UL-DL configuration public information. As another example, UL-DL configuration specific information may include information for overriding the flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration public information with UL symbols, DL symbols, and flexible symbols. That is, the terminal can overridden the flexible symbols in the slot format provided by the UL-DL configuration public information with a different type of symbol based on the UL-DL configuration specific information.

[0332] If, in each time slot indicated by the base station for PSCCH transmission, the symbol to be transmitted for PUSCH overlaps with the symbol indicated by the semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration private information), the terminal determines whether to transmit PUSCH based on the type (or direction) of the indicated symbol.

[0333] As an example, if at least one of the indicated symbols is a DL symbol, the terminal does not send a PUSCH and cancels the PUSCH transmission. Alternatively, if the indicated symbols are UL symbols and flexible symbols, the terminal sends a PUSCH in the corresponding time slot.

[0334] As another example, if at least one of the indicated symbols is a DL symbol or a flexible symbol, the terminal does not send a PUSCH and cancels the transmission of the PUSCH. Alternatively, if the indicated symbol is a UL symbol, the terminal sends the PUSCH in the time slot.

[0335] If at least one of the symbols for PUSCH transmission overlaps with a DL symbol in the first time slot of the time slot indicated for repeated PUSCH transmission, the terminal cancels the PUSCH transmission and does not transmit PUSCH in that time slot. That is, if the symbols for PUSCH transmission in the first time slot of the time slot indicated for repeated PUSCH transmission consist of UL symbols and flexible symbols, the terminal may transmit PUSCH in the corresponding time slot. If at least one of the symbols for PUSCH transmission overlaps with a DL symbol or a flexible symbol in a time slot following the first time slot of the time slot indicated for repeated PUSCH transmission, the terminal cancels the PUSCH transmission and does not transmit PUSCH in the corresponding time slot. That is, if the symbol indicated for PUSCH transmission in a time slot following the first time slot of the time slot indicated for repeated PUSCH transmission is configured with a UL symbol, the terminal may transmit PUSCH in the corresponding time slot.

[0336] The PUSCH processing method associated with the gap symbol is disclosed below.

[0337] There may be a gap for DL-UL handover between DL and UL symbols. The gap can be located within flexible symbols. Some symbols in the flexible symbols between DL and UL symbols can be used for the DL-UL handover gap and may not be used for DL ​​reception or UL transmission. Let G be the number of symbols used for the gap. G can be fixed to a specific value, such as 1 or 2, which can be configured in the terminal via an RRC message or obtained via a timing advance value.

[0338] If, in each time slot designated by the base station for PUSCH transmission, the symbol to be transmitted overlaps with a symbol indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration private information), the terminal determines whether to transmit the PUSCH based on the type (or direction) of the indicated symbol.

[0339] As an example, if all the indicated symbols are UL symbols, the terminal sends a PUCCH, and if at least one of the indicated symbols is a DL symbol or G consecutive flexible symbols immediately following a DL symbol, the terminal does not send a PUSCH in the corresponding time slot.

[0340] In other words, in each time slot designated by the base station for PUSCH transmission, if the symbol to be transmitted for PUSCH is a UL symbol, the terminal transmits PUSCH; and if at least one of the symbols to be transmitted overlaps with a DL symbol or at least one of the G consecutive Flex symbols immediately following the DL symbol, the terminal cancels the PUSCH transmission and does not perform PUSCH transmission. That is, when overlapping with any of the DL symbol and the G symbols used as gaps, PUSCH can be omitted and its transmission canceled.

[0341] Terminal and base station procedures for repeatedly receiving PDSCH

[0342] The number of time slots in which PDSCH is received or the number of times PDSCH is repeated can be one of several predetermined values ​​(i.e., 1, 2, 4, and 8), and can be a value configured to the actual terminal among several values ​​sent via RRC messages. If the number of times PDSCH is repeated is set to 1, it indicates that a normal PDSCH replaces the repeated PDSCH.

[0343] The start and length of the symbols in which the PDSCH is received within a time slot are indicated by the DCI, and this can be maintained the same across all time slots. The terminal determines whether to receive the PDSCH indicated by the DCI. This determination can be based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used for determination may include at least one of the UL-DL configuration common information TDD-UL-DL-ConfigurationCommon, which can be indicated by RRC signaling, and additional UL-DL configuration specific information TDD-UL-DL-ConfigDedicated, which can be indicated to the terminal by RRC signaling.

[0344] As an example, UL-DL configuration public information indicates the period for applying semi-static DL / UL assignment information and is used to configure the slot format and number of slots. This slot format is configured with the number of UDL symbols, the number of DL / UL symbols, and the number of flexible symbols per slot configured across multiple slots included in the period. That is, the terminal can configure the slot format for each slot based on the number of slots indicated by the UL-DL configuration public information. As another example, UL-DL configuration specific information may include information for overriding the flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration public information with UL symbols, DL symbols, and flexible symbols. That is, based on the UL-DL configuration specific information, the terminal can use a different symbol to overridden the flexible symbols in the slot configuration provided by the UL-DL configuration public information.

[0345] If, in a time slot designated by the base station for PDSCH reception, the symbol for which the terminal intends to receive the PDSCH overlaps with a symbol indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration private information), the terminal determines whether to receive the PDSCH based on the type (or direction) of the indicated symbol.

[0346] As an example, if at least one of the indicated symbols is a UL symbol, the terminal does not perform PDSCH reception. On the other hand, if the indicated symbols are DL symbols and flexible symbols, the terminal can receive PDSCH in the corresponding time slot.

[0347] As another example, if at least one of the indicated symbols is a UL symbol or an unknown (or flexible) symbol, the terminal does not receive the PDSCH. On the other hand, if the indicated symbol is a DL symbol, the terminal receives the PDSCH in the corresponding time slot.

[0348] If at least one of the symbols in which PDSCH is received in the first time slot of the time slot indicated by the repeated PDSCH reception overlaps with a UL symbol, the terminal will not receive PDSCH in the corresponding time slot. That is, if the symbols in which PDSCH is received in the first time slot of the time slot indicated for receiving repeated PDSCH consist of DL symbols and flexible symbols, the terminal can receive PDSCH in the corresponding time slot. Furthermore, if at least one of the symbols in which PDSCH is received in a time slot following the first time slot of the time slot indicated for receiving repeated PDSCH overlaps with a UL symbol or a flexible symbol, the terminal will not receive PDSCH in the corresponding time slot. In other words, if the symbols of the time slot indicated for receiving PDSCH by the base station and the symbols of the time slot indicating the time slot for receiving PDSCH include DL symbols in the time slot following the first time slot of the time slot indicated for receiving repeated PDSCH, the terminal can receive PDSCH in the corresponding time slot. Simultaneously, the terminal can receive PDSCH without additional reception in the postponed next time slot.

[0349] The PDSCH processing method associated with the gap symbol is disclosed below.

[0350] There may be a gap for DL-UL handover between DL and UL symbols. The gap can be located within flexible symbols. Some symbols in the flexible symbols between DL and UL symbols can be used for the DL-UL handover gap and may not be used for DL ​​reception or UL transmission. Let G be the number of symbols used for the gap. G can be fixed to a specific value, such as 1 or 2, which can be configured in the terminal via an RRC message or obtained via a timing advance value.

[0351] If, in a time slot designated by the base station for PDSCH reception, the symbol to be received for PDSCH overlaps with a symbol indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration private information), the terminal determines whether to receive the PDSCH based on the type (or direction) of the indicated symbol.

[0352] As an example, if all the indicated symbols are DL symbols, the terminal receives the PDSCH, and if at least one of the indicated symbols is a UL symbol or G consecutive flexible symbols immediately preceding the UL symbol, the terminal does not receive the PDSCH.

[0353] In other words, within the time slot designated by the base station for PDSCH reception, if the symbol to be received in that slot is a DL symbol, the terminal receives the PDSCH; and if the symbol to be received overlaps with at least one of the UL symbol or at least one of the G consecutive flexible symbols preceding the UL symbol, the terminal does not receive the PDSCH. Specifically, when the symbol to be transmitted overlaps with any of the UL symbol and any of the G symbols used as gaps, the base station cancels the transmission of the PDSCH and does not transmit it. The base station then postpones the transmission of the PDSCH to the next time slot.

[0354] On the other hand, if the terminal cancels the reception of PDSCH based on the semi-static DL / UL assignment information, a new HARQ-ARQ timing configuration method needs to be defined because the HARQ-ARQ timing can be changed.

[0355] On the one hand, when the reception of a PDSCH is cancelled, the new HARQ-ARQ timing can be determined based on the received PDSCH if the new HARQ-ARQ timing has not been cancelled. In other words, to determine the time slot in which the actual HARQ-ACK is sent, the terminal can use the last received PDSCH, excluding the HARQ-ACK timing and the cancelled PDSCH included in the DCI indicating PDSCH reception. For example, a terminal with a HARQ-ACK timing indicated by 4 time slots can send the HARQ-ACK 4 time slots after the time slot from which the last PDSCH was received.

[0356] On the other hand, even if PDSCH reception is cancelled, the HARQ-ARQ timing can be determined by assuming that the HARQ-ARQ timing remains unchanged and that the PDSCH is received. In other words, to determine the time slot in which the actual HARQ-ACK is sent, the terminal can perform calculations based on the HARQ-ACK timing included in the DCI indicating PDSCH reception and the last PDSCH before determining whether to cancel. For example, even if PDSCH reception is cancelled, a terminal indicated by the HARQ-ACK timing via four time slots can still send the HARQ-ACK four time slots after the last time slot of the allocated PDSCH.

[0357] Simultaneously, the terminal can be configured to perform inter-slot frequency hopping to achieve frequency diversity. Therefore, even when the terminal repeatedly transmits PUCCH (or PDSCH or PUSCH) to multiple time slots, it is necessary to define a method for the terminal to perform frequency hopping between time slots. This embodiment discloses which physical resource block (PRB) the PUCCH (or PDSCH, or PUSCH) is transmitted through in each time slot during inter-slot frequency hopping. Furthermore, this embodiment discloses an algorithm for determining the PRB based on the difference between the time slot in which the PUCCH is first transmitted and the current time slot, regardless of the number of times the PUCCH is repeatedly transmitted.

[0358] In one aspect, the inter-slot frequency hopping method in PUCCH transmission includes determining the resource block (RB) to transmit the PUCCH based on the index of a first time slot and the index of a second time slot in which a repeated PUCCH is first transmitted. Here, the result in time slot n can be obtained via Equation 7. s The starting RB index of one or more RBs that send PUCCH.

[0359] [Equation 7]

[0360]

[0361] In Equation 7, RB1 and RB2 are sent to the terminal via RRC messages as the starting RB indices for the first and second transitions, respectively, and are configured in the terminal. s,0 It is the index of the slot in which the PUCCH is first transmitted. When retransmitting the PUCCH based on the delay of the repeated PUCCH, this scheme can transmit it with only one transition.

[0362] On the other hand, the inter-slot frequency hopping method in PUCCH transmission includes frequency hopping whenever the terminal actually transmits a repeated PUCCH. The RB can be determined by the slot index through which its PUCCH is transmitted and the actual number of repetitions. More specifically, the frequency hopping frequency in slot n can be obtained through Equation 8. sThe starting RB index of one or more RBs that send PUCCH.

[0363] [Equation 8]

[0364]

[0365] In Equation 8, RB1 and RB2 are sent to the terminal via RRC messages as the starting RB indices for the first and second transitions, respectively, and are configured in the terminal. repeat (n) s ) is time slot n s The number of times the PUCCH has been repeatedly transmitted. In this method, regardless of the delay of the repeated PUCCH, the PUCCH can be sent using two different transitions.

[0366] [Another embodiment]

[0367] In addition to the method and determination process for retransmitting PUCCH across multiple time slots to improve PUCCH coverage, another embodiment of this disclosure also discloses a method for determining which time slot among multiple time slots to perform PUCCH retransmission.

[0368] The following describes a method for determining the time slot for PUCCH transmission of a terminal among multiple time slots.

[0369] On one hand, the terminal can determine the time slots for PUCCH transmission based on SS / PBCH blocks including synchronization signals for Radio Resource Management (RRM) measurements and information about initial cell connection. SS / PBCH blocks can be transmitted at predetermined locations, and the configuration for SS / PBCH block transmission can be configured in the terminal via an RRC message (i.e., SSB_transmitted-SIB1 information or SSB_transmitted) sent from the base station to the terminal. Within the time slots indicated by the configuration for SS / PBCH block transmission, flexible symbols for transmitting SS / PBCH blocks may exist. That is, flexible symbols can be used not only for PUCCH transmission but also for the transmission of SS / PBCH blocks including information about synchronization and initial cell access. In this case, there may be situations where the flexible symbols for transmitting SS / PBCH blocks and the flexible symbols for transmitting PUCCH blocks at least partially overlap.

[0370] As an example, the terminal determines the time slots for repeated PUCCH transmission by excluding time slots containing overlapping symbols from the time slots used for repeated PUCCH transmission, thus preventing collisions. In this way, the terminal determines multiple time slots for transmitting PUCCH based on SSB_transmitted-SIB1 and SSB_transmitted, and if PUCCH is repeatedly transmitted on multiple time slots, the base station can receive the repeated PUCCH from the terminal.

[0371] On the other hand, the terminal can determine the time slots for PUCCH transmission based on semi-static DL / UL assignment information and gaps.

[0372] In the following description, it is assumed that the gap is located in the symbol immediately preceding the symbol used for PUCCH transmission, and that the gap comprises one or two symbols. However, the location and number of symbols of the DL-UL handover gap between DL and UL can be configured differently depending on the configuration of the base station and the terminal. For example, the gap may include two or more symbols, and the terminal may consider two or more gap symbols to determine the time slot used for PUCCH transmission or to determine whether to postpone PUCCH transmission.

[0373] On the other hand, time slot determination can be performed based on at least one of the following: whether a PDSCH is allocated in the time slot, whether a control resource set (CORESET) for monitoring the PDCCH in the DL symbol in the time slot is allocated, whether a CSI-RS is allocated in the time slot, whether an SS / PBCH block is allocated in the time slot, and semi-static DL / UL assignment information.

[0374] As an example, to determine PUCCH transmission resources within a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol and a PDSCH is allocated to the DL symbol, the terminal does not consider the flexible symbol as a resource for PUCCH transmission. Instead, the terminal can determine a time slot that includes other UL symbols and the flexible symbol as a time slot for PUCCH transmission. If the symbol immediately preceding the flexible symbol is a DL symbol and no PDSCH is allocated to the DL symbol, the flexible symbol becomes an unallocated symbol. Therefore, the terminal does not consider unallocated symbols as gaps for DL-UL handover. The terminal can then determine the flexible symbol immediately following the DL symbol as a resource capable of repeated PUCCH transmission and determine it as a time slot for PUCCH transmission.

[0375] As another example, in order to determine the PUCCH transmission resources in a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol and the CORESET or search space for PDCCH monitoring is allocated to the DL symbol, the terminal can exclude time slots that include the flexible symbol from the time slots used for repeated PUCCH transmissions in order to facilitate monitoring of the allocated PDCCH.

[0376] As another example, in order to determine the PUCCH transmission resource in a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol and the CORESET or search space for PDCCH monitoring is allocated to the DL symbol, the terminal does not monitor the allocated PDCCH, and the flexible symbol can be regarded as a resource capable of repeated PUCCH transmission and determined as a time slot for PUCCH transmission.

[0377] As another example, a terminal can use semi-static DL / UL assignment information to determine the time slot for PUCCH transmission. The terminal can learn which time slot the PUCCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUCCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and if the symbol immediately preceding the symbol indicated for PUCCH transmission is not a DL symbol indicated in the semi-static DL / UL assignment information, the terminal can determine the corresponding time slot as the time slot for repeated PUCCH transmission and transmit the PUCCH in the corresponding time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUCCH is transmitted is a DL symbol indicated in the semi-static DL / UL assignment information, the terminal can postpone the PUCCH transmission to the next available time slot without transmitting a repeated PUCCH in the corresponding time slot. In other words, if the terminal can obtain information from RRC messages and / or dynamic signaling (e.g., PRI) about which symbols in each time slot the PUCCH will be transmitted, and at least one of these symbols overlaps with a DL symbol from the semi-static DL / UL assignment information, or the symbol immediately preceding the symbol in which the PUCCH will be transmitted is a DL symbol from the semi-static DL / UL assignment information, then the terminal will not transmit the PUCCH in that time slot; otherwise, the terminal will transmit the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUCCH can be deferred to be transmitted in the next available time slot.

[0378] As another example, a terminal can use information scheduled for the terminal to determine the time slot for PUCCH transmission. The terminal can learn which time slot the PUCCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUCCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and the PDSCH is not scheduled to the symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal can determine the corresponding time slot as the time slot for PUCCH transmission and transmit the PUCCH in that time slot. On the other hand, if the PDSCH is scheduled in the symbol immediately preceding the symbol in which the PUCCH is transmitted, the terminal can postpone PUCCH transmission to the next available time slot while not transmitting the PUCCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot will be transmitted for the PUCCH, and at least one of these symbols overlaps with the DL symbols of the semi-static DL / UL assignment information, or schedules a PDSCH in the symbols immediately preceding the symbols in which the PUCCH will be transmitted, then the terminal will not transmit the PUCCH in that time slot; otherwise, the terminal will transmit the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUCCH can be deferred to be transmitted in the next available time slot.

[0379] As another example, a terminal can use CSI-RS information configured in the terminal to determine the time slot for PUCCH transmission. The terminal can learn which time slot the PUCCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUCCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and CSI-RS reception is not configured in the symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal can determine the corresponding time slot as the time slot for PUCCH transmission and transmit the PUCCH in that time slot. On the other hand, if CSI-RS reception is scheduled in the symbol immediately preceding the symbol in which the PUCCH is transmitted, the terminal can postpone PUCCH transmission to the next available time slot without transmitting the PUCCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRIPRI) which symbols in each time slot the PUCCH is to be transmitted, and at least one of these symbols overlaps with the DL symbols of the semi-static DL / UL assignment information, or is scheduled for CSI-RS reception in a symbol immediately preceding the symbol in which the PUCCH is to be transmitted, then the terminal does not transmit the PUCCH in the corresponding time slot; otherwise, the terminal transmits the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUCCH can be deferred to be transmitted in the next available time slot.

[0380] As another example, a terminal can use PDCCH monitoring information configured in the terminal to determine the time slot for PUCCH transmission. The terminal can learn which time slot the PUCCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUCCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or assigned) in the symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal can determine the corresponding time slot as the time slot for PUCCH transmission and transmit the PUCCH in the corresponding time slot. On the other hand, if PDCCH monitoring is configured (or assigned) in the symbol immediately preceding the symbol in which the PUCCH is to be transmitted, the terminal can postpone PUCCH transmission to the next available time slot without transmitting the PUCCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot will be transmitted via PUCCH, and at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if PDCCH monitoring is configured in the symbol immediately preceding the symbol in which the PUCCH will be transmitted, then the terminal will not transmit the PUCCH in that time slot; otherwise, the terminal will transmit the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUCCH can be deferred to be transmitted in the next available time slot.

[0381] As another example, a terminal can learn from RRC messages and dynamic signaling (e.g., PRI) which time slot it should transmit the PUCCH. If at least one of the symbols indicated for transmitting the PUCCH overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and the PUCCH does not overlap with the SS / PBCH block immediately preceding the symbol indicated for transmission, the terminal can determine the corresponding time slot as the time slot for PUCCH transmission and transmit the PUCCH in that time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUCCH is transmitted overlaps with an SS / PBCH block, the terminal can postpone the PUCCH transmission to the next available time slot and not transmit the PUCCH in the corresponding time slot. In other words, if the terminal can obtain information from RRC messages and / or dynamic signaling (e.g., PRI) about which symbols in each time slot the PUCCH will be transmitted, and at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or the symbol immediately preceding the symbol in which the PUCCH will be transmitted overlaps with an SS / PBCH block, then the terminal will not transmit the PUCCH in that time slot; otherwise, the terminal will transmit the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUCCH can be deferred to be transmitted in the next available time slot.

[0382] In this embodiment, if a symbol designated as a DL symbol by Dynamic SFI in a time slot ends at the symbol immediately preceding the symbol used for repeated PUCCH transmission, and the PUCCH resource is configured such that transmission for repeated PUCCH begins from the next symbol, the terminal can postpone the time slot to a later time slot and not transmit PUCCH in that time slot. The postponed time slot can be the earliest time slot among those time slots where PUCCH can be transmitted.

[0383] The following text will describe, with a more specific example, how to determine the time slots used for PUCCH transmission based on whether the terminal allocates PDSCH within the time slot. In this case, it is assumed that a time slot consists of 14 symbols.

[0384] For example, suppose the UL symbol resource for PUCCH is configured with the last 12 symbols of a time slot, and a specific time slot sequentially includes two DL symbols, two flexible symbols, and ten UL symbols. When PDSCH is allocated to the two DL symbols immediately preceding the two flexible symbols, the terminal implicitly considers the first flexible symbol as a handover gap between DL and UL. The terminal then determines whether one flexible symbol (excluding the first flexible symbol) and ten UL symbols can be configured as PUCCH resources. However, because the UL symbol resource for PUCCH is configured with the last 12 symbols of a time slot, the terminal can exclude that time slot from the time slot resources used for PUCCH transmission. In the example above, if the UL symbol resource for PUCCH is configured with the last 11 symbols of a time slot, the terminal can identify that time slot as a time slot resource for PUCCH transmission.

[0385] Furthermore, for example, suppose the UL symbol resource for PUCCH is configured with the last six symbols of a time slot, and a specific time slot sequentially includes eight DL symbols, two flexible symbols, and four UL symbols. When PDSCH is allocated to the two DL symbols immediately preceding the two flexible symbols, the terminal implicitly considers the first flexible symbol as a handover gap between DL and UL. The terminal then determines whether one flexible symbol and four UL symbols, excluding the first flexible symbol, can be configured as PUCCH resources. However, because the UL symbol resource for PUCCH is configured with the last six symbols of a time slot, the terminal can exclude that time slot from the time slot resources used for PUCCH transmission. In the example above, if the UL symbol resource for PUCCH is configured with the last five symbols of a time slot, the terminal can identify that time slot as a time slot resource for PUCCH transmission.

[0386] [Another embodiment]

[0387] In addition to the method and determination process for retransmitting PUSCH across multiple time slots to improve PUSCH coverage, another embodiment of this disclosure also discloses a method for determining which time slot among multiple time slots to perform PUSCH retransmission.

[0388] On the other hand, the determination of the time slot for sending PUSCH can be performed based on at least one of the following: whether PDSCH is allocated in the time slot, whether control resource set (CORESET) for monitoring PDCCH in DL symbols is allocated in the time slot, whether CSI-RS is allocated in the time slot, whether SS / PBCH block is allocated in the time slot, and semi-static DL / UL assignment information.

[0389] As an example, a terminal can use semi-static DL / UL assignment information to determine the time slot for PUSCH transmission. The terminal can learn which time slot the PUSCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If the symbol indicated for PUSCH transmission overlaps with the flexible symbol indicated in the semi-static DL / UL assignment information, and if the symbol immediately preceding the symbol indicated for PUSCH transmission is not a DL symbol indicated in the semi-static DL / UL assignment information, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission and transmit the PUSCH in that time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUSCH is transmitted is a DL symbol indicated in the semi-static DL / UL assignment information, the terminal can postpone the PUSCH transmission to the next available time slot without transmitting the PUSCH in the corresponding time slot. In other words, if the terminal can obtain information from RRC messages and / or dynamic signaling (e.g., PRI) about the symbols to be transmitted for PUSCH in each time slot, and at least one of these symbols overlaps with a DL symbol from the semi-static DL / UL assignment information, or the symbol immediately preceding the symbol to be transmitted for PUSCH is a DL symbol from the semi-static DL / UL assignment information, then the terminal will not transmit PUSCH in that time slot; otherwise, the terminal will transmit PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, untransmitted PUSCH can be deferred to be transmitted in the next available time slot.

[0390] As another example, a terminal can use information scheduled for the terminal to determine the time slot for PUSCH transmission. The terminal can learn which time slot the PUSCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUSCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and the PDSCH is not scheduled to the symbol immediately preceding the symbol indicated for PUSCH transmission, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission and transmit the PUSCH in that time slot. On the other hand, if the PDSCH is scheduled in the symbol immediately preceding the symbol in which the PUSCH is transmitted, the terminal can postpone the PUSCH transmission to the next available time slot without transmitting the PUSCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot the PUSCH is to be transmitted, and at least one of these symbols overlaps with the DL symbols of the semi-static DL / UL assignment information, or schedules the PDSCH in the symbols immediately preceding the symbols in which the PUSCH is to be transmitted, then the terminal does not transmit the PUSCH in that time slot; otherwise, the terminal transmits the PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUSCH can be deferred to be transmitted in the next available time slot.

[0391] As another example, a terminal can use CSI-RS information configured in the terminal to determine the time slot for PUSCH transmission. The terminal can learn which time slot the PUSCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUSCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and CSI-RS reception is not configured in the symbol immediately preceding the symbol indicated for PUSCH transmission, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission and transmit the PUSCH in that time slot. Conversely, if CSI-RS reception is configured in the symbol immediately preceding the symbol to which the PUSCH is to be transmitted, the terminal does not transmit the PUSCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot the PUSCH is to be transmitted, and at least one of these symbols overlaps with the DL symbols of the semi-static DL / UL assignment information, or CSI-RS reception is scheduled in the symbols immediately preceding the symbols in which the PUSCH is to be transmitted, then the terminal does not transmit the PUSCH in that time slot; otherwise, the terminal transmits the PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUSCH can be deferred to be transmitted in the next available time slot.

[0392] As another example, a terminal can use PDCCH monitoring information configured in the terminal to determine the time slot for PUSCH transmission. The terminal can learn which time slot the PUSCH should be transmitted in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUSCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or assigned) in the symbol immediately preceding the symbol indicated for PUSCH transmission, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission and transmit the PUSCH in that time slot. Conversely, if PDCCH monitoring is configured (or assigned) in the symbol immediately preceding the symbol in which the PUSCH is to be transmitted, the terminal does not transmit the PUSCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot the PUSCH will be transmitted, and at least one of these symbols overlaps with the DL symbols in the semi-static DL / UL assignment information, or if PDCCH monitoring is configured in the symbols immediately preceding the symbols in which the PUSCH will be transmitted, then the terminal will not transmit the PUSCH in the corresponding time slot; otherwise, the terminal will transmit the PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUSCH can be deferred to be transmitted in the next available time slot.

[0393] As another example, a terminal can learn from RRC messages and dynamic signaling (e.g., PRI) which time slot it should transmit the PUSCH in. If at least one of the symbols indicated for transmitting the PUSCH overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and the PUSCH does not overlap with an SS / PBCH block immediately preceding the symbol indicated for transmission, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission and transmit the PUSCH in that time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUSCH is to be transmitted overlaps with an SS / PBCH block, the terminal does not transmit the PUSCH in the corresponding time slot. In other words, if the terminal can obtain information from RRC messages and / or dynamic signaling (e.g., PRI) about the symbols in each time slot for which a PUSCH is to be transmitted, and at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or the symbol immediately preceding the symbol in which the PUSCH is transmitted overlaps with an SS / PBCH block, then the terminal will not transmit the PUSCH in that time slot; otherwise, the terminal will transmit the PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PUSCH can be deferred to be transmitted in the next available time slot.

[0394] [Another embodiment]

[0395] In addition to the method and determination process of repeatedly transmitting PUSCH on multiple time slots to improve PUSCH coverage, another embodiment of this disclosure also discloses a method for determining which time slot among multiple time slots to perform repeated PUSCH transmission.

[0396] Meanwhile, the determination of the time slot for receiving PDSCH is performed based on at least one of the following: whether PUSCH is allocated in the time slot, whether PUCCH is allocated, whether SRS transmission is allocated, whether PRACH transmission is allocated, and semi-static DL / UL assignment information.

[0397] As an example, a terminal can use semi-static DL / UL assignment information to determine the time slot for PDSCH reception. The terminal can learn which time slot it should receive PDSCH in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicating PDSCH reception overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and if the symbol immediately following the symbol indicating PDSCH reception is not a UL symbol indicated in the semi-static DL / UL assignment information, the terminal can determine the corresponding time slot as the time slot for PDSCH reception and receive PDSCH in that time slot. On the other hand, if the symbol immediately following the symbol indicating PDSCH reception is a UL symbol indicated in the semi-static DL / UL assignment information, the terminal does not receive PDSCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot the PDSCH will be received, and at least one of these symbols overlaps with the UL symbol of the semi-static DL / UL assignment information, or the symbol immediately following the symbol in which the PDSCH will be sent is the UL symbol of the semi-static DL / UL assignment information, then the terminal will not receive the PDSCH in that time slot, and if not, the terminal will receive the PUCCH in the corresponding time slot.

[0398] As another example, a terminal can use uplink information (PUSCH, PUCCH, PRACH, SRS, etc.) scheduled for the terminal to determine the time slot for PDSCH reception. The terminal can learn which time slot it should receive PDSCH in via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PDSCH reception overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and if PDSCH is not scheduled with PDSCH, PUCCH, PRACH, or SRS in a symbol immediately following the symbol indicated for reception, the terminal can determine the corresponding time slot as the time slot for PDSCH reception and receive PDSCH in that time slot. On the other hand, if PUSCH, PUCCH, PRACH, or SRS is scheduled in a symbol immediately following the symbol in which PDSCH is to be received, the terminal does not receive PDSCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot the PDSCH will be received, and at least one of these symbols overlaps with the UL symbols of the semi-static DL / UL assignment information, or schedules PUSCH, PUCCH, PRACH, or SRS in a symbol immediately following the symbol in which the PDSCH is sent, then the terminal will not receive the PDSCH in that time slot; and if not, the terminal will receive the PUCCH in the corresponding time slot. Here, the PUCCH may be a PUCCH used to send HARQ-ACK. Alternatively, the PUCCH may be a PUCCH used to send a scheduling request (SR).

[0399] As another example, a terminal can use CSI-RS information configured in the terminal to determine the time slot for PDSCH transmission. The terminal can learn which time slot should be used to transmit PDSCH via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for receiving PDSCH overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and CSI-RS reception is not configured in the symbol immediately preceding the symbol indicated for PDSCH reception, the terminal can determine the corresponding time slot as the time slot for PDSCH transmission and transmit PDSCH in the corresponding time slot. On the other hand, if CSI-RS reception is scheduled in the symbol immediately preceding the symbol in which PDSCH is transmitted, the terminal can postpone PDSCH transmission to the next available time slot while not transmitting PDSCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot will be transmitted for PDSCH, and at least one of these symbols overlaps with the DL symbols of the semi-static DL / UL assignment information, or CSI-RS reception is scheduled in the symbols immediately preceding the symbols in which the PDSCH will be transmitted, then the terminal will not transmit the PDSCH in that time slot; otherwise, the terminal will transmit the PDSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, the untransmitted PDSCH can be deferred to be transmitted in the next available time slot.

[0400] As another example, a terminal can use PDCCH monitoring information configured in the terminal to determine the time slot for PDSCH transmission. The terminal can learn which time slot should transmit PDSCH via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated to receive PDSCH overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or assigned) in the symbol immediately preceding the symbol in which PDCCH is to be transmitted, the terminal can determine the corresponding time slot as the time slot for PDSCH transmission and transmit PDSCH in the corresponding time slot. On the other hand, if PDCCH monitoring is configured (or assigned) in the symbol immediately preceding the symbol in which PDSCH is to be transmitted, the terminal can postpone PDSCH transmission to the next available time slot while not transmitting PDSCH in the corresponding time slot. In other words, if the terminal can learn from RRC messages and / or dynamic signaling (e.g., PRI) which symbols in each time slot will be transmitted for PDSCH, and at least one of these symbols overlaps with the DL symbols in the semi-static DL / UL assignment information, or if PDSCH monitoring is configured in the symbols immediately preceding the symbols in which PUCCH will be transmitted, then the terminal will not transmit PDSCH in that time slot; otherwise, the terminal will transmit PDSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. Here, untransmitted PDSCH can be deferred to be transmitted in the next available time slot.

[0401] As another example, the SS / PBCH block can be configured to overlap with DL symbols, flexible symbols, and UL symbols in semi-static DL / UL assignment information for the terminal. In this case, the terminal can treat the symbols overlapping with the SS / PBCH block as semi-static DL symbols. That is, if a semi-static UL symbol is configured in the terminal and the SS / PBCH block overlaps with that symbol, the terminal can assume that the symbol is configured as a semi-static DL symbol. Additionally, if the symbol immediately following the symbol overlapping with the SS / PBCH block is a semi-static UL symbol, the terminal can assume that the semi-static UL symbol is a semi-static flexible symbol.

[0402] [Another embodiment]

[0403] According to another embodiment of this specification, a situation arises where the terminal cannot perform downlink reception and uplink transmission due to insufficient gap between the DL symbol requiring downlink reception and the UL symbol requiring uplink transmission. At least a DL-UL switching gap is required between the terminal's downlink reception and uplink transmission. Here, the DL-UL switching gap can be used interchangeably as a switching gap, or simply as a gap, and they have equivalent meanings except for the expression.

[0404] The length of the DL-UL handover gap can vary depending on the carrier frequency. For example, when the carrier frequency is 6 GHz or below (hereinafter referred to as Frequency Range (FR) 1), the DL-UL handover gap may require 13 μs. Alternatively, if the carrier frequency is 6 GHz or higher (hereinafter referred to as FR2), the DL-UL handover gap may require 7 μs.

[0405] The DL-UL handover gap is also affected by the timing advance (TA) value and the TA offset value. Additionally, the DL-UL handover gap may be affected by the subcarrier spacing. That is, the DL-UL handover gap can be determined based on the TA value, the TA offset value, and / or the subcarrier spacing. For example, when the duration of a symbol is X μs, the symbol G required for the DL-UL handover gap can be given as G = ceil((Rx2Tx + TA + TA_offset) / X). ​​Here, Rx2Tx can have different values ​​depending on the carrier frequency. For example, when the carrier frequency is 6 GHz or lower (FR1), Rx2Tx can be 13 μs, and when it is 6 GHz or higher (FR2), Rx2Tx can be 7 μs. TA can be the TA value that the terminal is configured to receive from the base station, or the maximum of the TA values ​​that the terminal can be configured to receive from the base station. TA_offset in FR1 can be 39936. Tc or 25600 Tc, while in FR2 it can be 13792 Tc. Here, Tc = 1 / (480 103 4096). Here, the switching interval can be the RF interrupt time.

[0406] Table 5 shows an example of the number of symbols required for the DL-UL handover gap based on the subcarrier spacing.

[0407] [Table 5]

[0408]

[0409] Table 6 shows another example of the number of symbols required for the DL-UL handover gap based on the subcarrier spacing.

[0410] [Table 6]

[0411]

[0412] The following describes a method for processing the transmission of uplink channels or uplink signals based on downlink signals received by the terminal and the UL-DL handover gap G. In this embodiment, downlink signals may include SS / PBCH blocks, PDSCH, PDCCH, periodic signals, measurement signals, etc. Furthermore, in this embodiment, uplink channels may include PUSCH, PUCCH, PRACH, etc., and uplink signals may include SRS, periodic signals, measurement signals, etc.

[0413] Symbols for SS / PBCH block transmission and uplink transmission

[0414] In one aspect, a method for processing uplink transmissions includes: a terminal determining whether at least one of the symbols indicated for transmission of an uplink channel or uplink signal is configured to overlap (i.e., contradictory) with symbols indicated for receiving an SS / PBCH block from a base station (or symbols used for SS / PBCH block transmission); and transmitting the uplink channel or uplink signal based on this determination. Here, if at least some of the symbols of the received SS / PBCH block are configured to overlap with the transmission of an uplink channel or uplink signal, the terminal does not transmit the uplink channel or uplink signal; and if not, the terminal transmits the uplink signal.

[0415] On the other hand, a method for processing uplink transmission includes: a terminal determining whether at least one of the symbols indicated for uplink channel transmission or uplink signal transmission is configured to overlap with symbols allocated to an SS / PBCH block indicated for reception from a base station, and transmitting the uplink channel or uplink signal based on this determination. Here, if at least some of the G symbols are configured to overlap with the uplink channel transmission or uplink signal transmission, the terminal does not transmit the uplink channel or uplink signal; otherwise, the terminal transmits the uplink signal.

[0416] Symbols used for downlink and uplink transmission

[0417] In another aspect, a method for processing uplink transmissions includes: a terminal determining whether at least one of the symbols indicated for uplink channel transmission or uplink signal transmission is configured to overlap with a symbol indicated for receiving downlink transmission from a base station (or a symbol used for downlink transmission), and transmitting the uplink channel or uplink signal based on this determination. Here, if at least some of the received downlink transmission symbols are configured to overlap with the uplink channel transmission or uplink signal transmission, the terminal does not transmit the uplink channel or uplink signal; otherwise, the terminal transmits the uplink signal.

[0418] In another aspect, a method for processing uplink transmission includes: a terminal determining whether at least one of the symbols indicated for uplink channel transmission or uplink signal transmission is configured to overlap with G symbols following a symbol indicated for receiving downlink transmission from a base station, and transmitting the uplink channel or uplink signal based on this determination. Here, if at least some of the G symbols are configured to overlap with the transmission of the uplink channel or uplink signal, the terminal does not transmit the uplink channel or uplink signal; otherwise, the terminal transmits the uplink signal.

[0419] On the other hand, this embodiment may include scheduling performed by the base station (i.e., dynamic scheduling at Layer 1L1) such that symbols used for downlink transmission and symbols used for uplink transmission do not overlap. That is, when the base station performs scheduling for the terminal, uplink transmission can be configured based on G symbols. In this case, the terminal may not expect the base station to configure its uplink transmission in G symbols.

[0420] Alternatively, in this embodiment, configuring uplink transmission based on RRC configuration instead of L1 dynamic scheduling includes the terminal determining whether the uplink transmission configured with RRC overlaps with the G symbol and, based on this, determining whether to perform or not perform uplink channel or signal transmission by the terminal.

[0421] The following discloses a method in which a terminal processes downlink reception and uplink channel (or uplink signal) transmission based on a UL-DL handover gap G. In this embodiment, the downlink signal may include SS / PBCH blocks, PDSCH, PDCCH, CSI-RS, etc. Additionally, in this embodiment, the uplink channel may include PUSCH, PUCCH, PRACH, etc., and the uplink signal may include SRS.

[0422] Downlink signals are processed based on whether the flexible symbol and uplink signals overlap.

[0423] In symbols configured by flexible symbols via semi-static DL / UL assignment information or symbols not configured by semi-static DL / UL assignment information, the terminal may or may not receive downlink signals (i.e., downlink periodic signals or measurement signals) configured via UE-specific RRC messages. In this case, the terminal's method for handling the configured downlink reception may be based on the arrangement relationship (e.g., overlap relationship) between the UL-DL handover gap and the uplink signals.

[0424] In one aspect, a method for a terminal to process configured downlink reception may include: determining whether the terminal is configured to transmit an uplink signal within G symbols following the last symbol of a configured downlink signal, and receiving the configured downlink signal based on the determination. Here, as a result of the determination, if the uplink signal does not overlap within the G symbols following the last symbol of the configured downlink signal, the terminal may receive the configured downlink signal. Conversely, if the uplink signal overlaps within the G symbols, the terminal does not receive the configured downlink signal. In other words, if there are no at least G gap symbols in a time slot between the last DL symbol configured by semi-static DL / UL assignment information and the first symbol allocated to the uplink signal, the terminal discards the downlink signal.

[0425] Here, uplink signals may include uplink signals configured by cell-specific RRC messages. For example, uplink signals configured by cell-specific RRC messages may include PRACH.

[0426] Alternatively, the uplink signaling may include uplink signals indicated by L1 signaling. As an example, uplink signals indicated by L1 signaling may include a PUSCH scheduled in DCI format 0_0 or 0_1. As another example, uplink signals indicated by L1 signaling may include a PUCCH comprising a HARQ-ACK response to a PDSCH scheduled in DCI format 1_0 or 1_1. As another example, uplink signals indicated by L1 signaling may include an SRS signal indicated by DCI. As yet another example, uplink signals indicated by L1 signaling may include a first transmission in an uplink semi-persistently scheduled (SPS) PDSCH transmission indicated by a DCI scrambled with CS-RNTI.

[0427] Furthermore, downlink signals may include CSI-RS configured by a UE-specific RRC message. As an example, downlink signals may include CORESET for PDCCH monitoring configured by a UE-specific RRC message. As another example, downlink signals may include downlink SPS PDSCH transmissions scrambled with CS-RNTI (in addition to the first transmission).

[0428] On the other hand, a method for a terminal to process downlink reception may include: the terminal determining whether a UL symbol configured by semi-static DL / UL assignment information overlaps within G symbols following the last symbol of the downlink signal; and receiving the downlink signal based on this determination. As a result of the determination, if the UL symbols configured by the semi-static DL / UL assignment information overlap within G symbols, the terminal does not receive the downlink signal; otherwise, the terminal receives the downlink signal. In other words, if there are no at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0429] On the other hand, a method for a terminal to process configured downlink reception may include: determining, by the terminal, whether a UL symbol indicated by a dynamic SFI overlaps within G symbols following the last symbol of a configured downlink signal, and receiving the configured downlink signal based on this determination. As a result of the determination, if the UL symbol indicated by the dynamic SFI overlaps within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives the downlink signal. In other words, if there are no at least G gap symbols between the last DL symbol configured by semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0430] On the other hand, a method for a terminal to process configured downlink reception may include: the terminal determining whether a DL symbol configured by semi-static DL / UL assignment information overlaps within G symbols preceding the first symbol of the downlink signal, and receiving the configured downlink signal based on this determination. As a result of the determination, if the DL symbols configured by the semi-static DL / UL assignment information overlap within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives the configured downlink signal. In other words, if there are no at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0431] On the other hand, a method for a terminal to process configured downlink reception may include: the terminal determining whether a DL symbol indicated by a dynamic SFI overlaps within G symbols preceding a first symbol of an uplink signal; and receiving the configured downlink signal based on this determination. As a result of the determination, if the DL symbol indicated by the dynamic SFI overlaps within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives the configured downlink signal. In other words, if there are no at least G gap symbols between the last DL symbol configured by semi-static DL / UL assignment information and the first symbol assigned to the uplink signal in a time slot, the terminal discards the downlink signal.

[0432] Here, a method for a terminal to process uplink transmissions may include: configuring or indicating uplink signals via L1 signals during a period of G symbols following a downlink signal (downlink periodic signal or measurement signal) configured via a UE-specific RRC message in a symbol configured by flexible symbols according to semi-static DL / UL assignment information or in a symbol not configured according to semi-static DL-UL assignment information.

[0433] Uplink signal processing based on whether flexible symbols and downlink signals overlap.

[0434] In symbols configured by flexible symbols according to semi-static DL / UL assignment information or symbols not configured according to semi-static DL / UL assignment information, the terminal may or may not transmit uplink signals (i.e., uplink periodic signals or measurement signals) configured by UE-specific RRC messages. In this case, the method by which the terminal handles uplink transmissions can be determined based on the arrangement relationship (e.g., overlap relationship) between the UL-DL handover gap and the downlink signals.

[0435] In one aspect, a method for a terminal to process configured uplink transmissions may include transmitting the configured uplink signal based on whether the terminal receives a downlink signal within G symbols preceding the first symbol of the configured uplink signal. That is, if the downlink signal does not overlap with the first symbol of the configured uplink signal within G symbols, the terminal may transmit the configured uplink signal. Conversely, if the downlink signal overlaps within G symbols, the terminal does not transmit the configured uplink signal. In other words, if there are no at least G gap symbols between the first UL symbol configured by semi-static DL / UL assignment information and the last symbol assigned to the downlink signal in a time slot, the terminal discards the uplink signal.

[0436] Here, downlink signals may include downlink signals configured by cell-specific RRC messages. As an example, downlink signals configured by cell-specific RRC messages may include SS / PBCH blocks. As another example, downlink signals configured by cell-specific RRC messages may include a type 0 common search space. Here, the type 0 common search space is the search space used to receive Remaining Minimal Scheduling Information (RMSI). As another example, downlink signals configured by cell-specific RRC messages may include a type 0A common search space. Here, the type 0A common search space is the search space used to receive PRACH responses during random access.

[0437] Alternatively, the downlink signaling may include downlink signals indicated by L1 signaling. As an example, the uplink signaling indicated by L1 signaling may include a PDSCH scheduled in DCI format 1_0 or 1_1. As another example, the uplink signaling indicated by L1 signaling may include aperiodic CSI-RS indicated by DCI. As yet another example, the uplink signaling indicated by L1 signaling may include a first transmission of an uplink semi-persistently scheduled (SPS) PDSCH indicated by DCI scrambled with CS-RNTI.

[0438] Additionally, uplink signals may include SRS configured by UE-specific RRC messages. As an example, uplink signals may include periodic PUCCH and PUSCH configured by UE-specific RRC messages. As another example, uplink signals may include SR configured by UE-specific RRC messages.

[0439] On the other hand, a method for a terminal to process a configured uplink transmission may include: determining whether DL symbols configured by semi-static DL / UL assignment information overlap in G symbols preceding the first symbol of the configured uplink signal, and the terminal transmitting the configured uplink signal based on this determination. As a result of the determination, if the DL symbols configured by semi-static DL / UL assignment information do not overlap in G symbols, the terminal transmits the configured uplink signal; otherwise, the terminal does not transmit the configured uplink signal. In other words, if there are no at least G gap symbols between the first UL symbol configured by semi-static DL / UL assignment information and the last symbol allocated to the downlink signal in a time slot, the terminal discards the uplink signal.

[0440] Here, a method for a terminal to process uplink transmissions may include: configuring or indicating uplink signals via L1 signals during a period of G symbols following a downlink signal (downlink periodic signal or measurement signal) configured via a UE-specific RRC message in a symbol configured by flexible symbols according to semi-static DL / UL assignment information or in a symbol not configured according to semi-static DL-UL assignment information.

[0441] In symbols configured by flexible symbols according to semi-static DL / UL assignment information or in symbols not configured according to semi-static DL / UL assignment information, if the number of symbols between the last symbol of the downlink signal configured by cell-specific RRC message or indicated by L1 signaling and the first symbol of the uplink signal configured by cell-specific RRC message or indicated by L1 signaling is less than G, the terminal operates as follows.

[0442] As an example, a terminal may receive downlink signals configured by cell-specific RRC messages, but may not send uplink signals configured by cell-specific RRC messages or indicated by L1 signaling.

[0443] As another example, a terminal can send uplink signals configured by a cell-specific RRC message and may not receive downlink signals configured by a cell-specific RRC message or indicated by L1 signaling.

[0444] As another example, the terminal can operate based on L1 signaling. That is, when L1 signaling indicates downlink reception and a cell-specific RRC message configures uplink transmission, the terminal can perform downlink reception or not perform uplink transmission. Conversely, if L1 signaling indicates uplink reception and a cell-specific RRC message configures downlink transmission, the terminal can perform uplink transmission but not downlink reception.

[0445] Figure 17 This is a block diagram illustrating the configuration of a terminal and a base station according to embodiments of the present invention. In embodiments of the present invention, the UE can be implemented using various types of wireless communication devices or computing devices that are guaranteed to be portable and mobile. The UE can be referred to as a User Equipment (UE), a Station (STA), a Mobile Subscriber (MS), etc. Furthermore, in embodiments of the present invention, the base station controls and manages cells (e.g., macro cells, femtocells, picocells, etc.) corresponding to the service area, and performs functions such as signal transmission, channel designation, channel monitoring, self-diagnosis, and relaying. The base station can be referred to as a Next Generation Node B (gNB) or an Access Point (AP).

[0446] As shown in the figure, the UE 100 according to an embodiment of the present invention may include a processor 110, a communication module 120, a memory 130, a user interface unit 140, and a display unit 150. The terminal 100 is the terminal described in the embodiments of this specification and can perform the operations and processes according to each embodiment of this specification. Specifically, according to each embodiment of this specification, the communication module 120 performs the operation of the terminal sending or receiving objects, and the processor 110 can perform operations such as generating, determining, and deciding other objects.

[0447] First, the processor 110 can execute various instructions or programs and process data within the UE 100. Additionally, the processor 110 can control the overall operation of each unit including the UE 100 and can control the transmission / reception of data between the units. Here, the processor 110 can be configured to perform operations according to the embodiments described in this disclosure. For example, the processor 110 can receive time slot configuration information, determine a time slot configuration based on the time slot configuration information, and perform communication according to the determined time slot configuration.

[0448] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, the communication module 120 may include multiple network interface cards (NICs) in internal or external form, such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123. In the figures, the communication module 120 is shown as a monolithic integrated module; however, unlike the figures, each network interface card may be arranged independently depending on the circuit configuration or purpose.

[0449] Cellular communication interface card 121 can transmit or receive radio signals with at least one of base station 200, external device, and server using a mobile communication network, and provide cellular communication services in a first frequency band based on instructions from processor 110. According to an embodiment, cellular communication interface card 121 may include at least one NIC module using a frequency band less than 6 GHz. At least one NIC module of cellular communication interface card 121 can independently perform cellular communication with at least one of base station 200, external device, and server in a frequency band less than 6 GHz supported by the respective NIC module, according to cellular communication standards or protocols.

[0450] Cellular communication interface card 122 can transmit or receive radio signals with at least one of base station 200, external devices, and servers using a mobile communication network, and provide cellular communication services in a second frequency band based on instructions from processor 110. According to one embodiment, cellular communication interface card 122 may include at least one NIC module using a frequency band greater than 6 GHz. At least one NIC module of cellular communication interface card 122 can independently perform cellular communication with at least one of base station 200, external devices, and servers in a frequency band of 6 GHz or more supported by the corresponding NIC module, according to cellular communication standards or protocols.

[0451] The unlicensed frequency band communication interface card 123 transmits or receives radio signals with at least one of the base station 200, external devices, and servers by using a third frequency band that is an unlicensed frequency band, and provides unlicensed frequency band communication services based on instructions from the processor 110. The unlicensed frequency band communication interface card 123 may include at least one NIC module using an unlicensed frequency band. For example, the unlicensed frequency band may be a 2.4 GHz or 5 GHz band. At least one NIC module of the unlicensed frequency band communication interface card 123 may independently or non-independently perform wireless communication with at least one of the base station 200, external devices, and servers according to the unlicensed frequency band communication standard or frequency band protocol supported by the respective NIC module.

[0452] The memory 130 stores the control program used in the UE 100 and various data used therein. Such a control program may include prescribed procedures for performing wireless communication with at least one of the base station 200, external devices, and servers.

[0453] Next, the user interface 140 includes various input / output devices configured in the UE 100. In other words, the user interface 140 can use various input devices to receive user input, and the processor 110 can control the UE 100 based on the received user input. Additionally, the user interface 140 can use various output devices to perform output based on instructions from the processor 110.

[0454] Next, the display unit 150 outputs various images on the display screen. The display unit 150 can output various display objects, such as content executed by the processor 110 or a user interface, based on control instructions from the processor 110.

[0455] Furthermore, the base station 200 according to embodiments of the present invention may include a processor 210, a communication module 220, and a memory 230. The base station 200 is the base station described in each embodiment of this specification and can execute base station operations and processes corresponding to the operations and processes of the terminal according to each embodiment of this specification. Specifically, according to each embodiment of this specification, the communication module 220 performs operations of receiving or transmitting objects by the base station, and the processor 210 can perform operations such as generating, determining, and deciding other objects.

[0456] First, the processor 210 can execute various instructions or programs and process the internal data of the base station 200. Additionally, the processor 210 can control the overall operation of the units within the base station 200 and control data transmission and reception between the units. Here, the processor 210 can be configured to perform operations according to the embodiments described in this invention. For example, the processor 210 can be configured with signal transmission time slots and perform communication according to the signal transmission time slot configuration.

[0457] Next, communication module 220 can be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, communication module 120 may include multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, in internal or external form. In the figures, communication module 220 is shown as an integral integrated module; however, unlike the figures, each network interface card may be arranged independently depending on the circuit configuration or purpose.

[0458] Cellular communication interface card 221 can transmit or receive radio signals with at least one of base station 100, external devices, and servers using a mobile communication network, and provide cellular communication services in a first frequency band based on instructions from processor 210. According to an embodiment, cellular communication interface card 221 may include at least one NIC module using a frequency band less than 6 GHz. At least one NIC module of cellular communication interface card 221 can independently perform cellular communication with at least one of base station 100, external devices, and servers in a frequency band less than 6 GHz supported by the respective NIC module, according to cellular communication standards or protocols.

[0459] Cellular communication interface card 222 can transmit or receive radio signals with at least one of base station 100, external devices, and servers using a mobile communication network, and provide cellular communication services in a second frequency band based on instructions from processor 210. According to an embodiment, cellular communication interface card 222 may include at least one NIC module using a 6 GHz or higher frequency band. At least one NIC module of cellular communication interface card 222 can independently perform cellular communication with at least one of base station 100, external devices, and servers in a 6 GHz or higher frequency band supported by the respective NIC module, according to cellular communication standards or protocols.

[0460] The unlicensed frequency band communication interface card 223 transmits or receives radio signals with at least one of the base station 100, external devices, and servers by using a third frequency band, which is an unlicensed frequency band, and provides unlicensed frequency band communication services based on instructions from the processor 210. The unlicensed frequency band communication interface card 223 may include at least one NIC module using an unlicensed frequency band. For example, the unlicensed frequency band may be a 2.4 GHz or 5 GHz band. At least one NIC module of the unlicensed frequency band communication interface card 223 may independently or non-independently perform wireless communication with at least one of the base station 100, external devices, and servers according to the unlicensed frequency band communication standard or frequency band protocol supported by the respective NIC module.

[0461] Figure 17 This is a block diagram illustrating a UE 100 and a base station 200 according to an embodiment of the present invention, and the blocks shown are logically partitioned elements of the device. Therefore, depending on the device design, the aforementioned elements of the device can be installed in a single chip or multiple chips. Additionally, a portion of the configuration of the UE 100 may be selectively provided in the UE 100, for example, a user interface 140, a display unit 150, etc. Furthermore, if desired, a user interface 140, a display unit 150, etc., may be additionally provided in the base station 200.

[0462] The foregoing description of this disclosure has been given for purposes of illustration and description. It will be apparent to those skilled in the art to whom this disclosure relates that this disclosure can be readily modified into other detailed forms without altering the technical principles or essential characteristics of this disclosure. Therefore, the embodiments described above are presented for illustrative purposes only and do not limit the scope of this disclosure. For example, each component described as a single type may be implemented in a distributed manner. Similarly, components described as distributed may be implemented in a composite manner.

[0463] The scope of this disclosure is defined by the appended claims rather than the foregoing description. It should be understood that all changes or modifications derived from the definitions and scope of the claims and their equivalents fall within the scope of this disclosure.

Claims

1. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising: Communication module; and processor, The processor is configured as follows: The base station (BS) receives semi-static uplink-downlink configuration information related to time slot configuration, wherein the time slot configuration includes, in sequence, a downlink symbol set and a flexible symbol set. The gap symbol size is determined to be one of several values ​​based on the configuration between the UE and the BS. The size of the gap symbol corresponds to the time interval required for downlink to uplink handover. Based on whether the interval between the reference symbol and the start symbol of the transmission resource is less than the gap symbol size, it is determined whether the transmission resource of the uplink radio signal is valid in the time slot, and When the transmission resource in the time slot is determined to be valid, the transmission of the uplink radio signal is performed in the transmission resource. Wherein, when the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block is configured within the downlink symbol set, the reference symbol is the last symbol of the downlink symbol set, and Wherein, when the symbol of the SS / PBCH block is configured on the flexible symbol set, the reference symbol is the last symbol of the SS / PBCH block.

2. The UE according to claim 1, in, When the interval between the reference symbol and the start symbol of the transmission resource is less than the gap symbol size, the transmission resource of the uplink radio signal is determined to be invalid.

3. The UE according to claim 1, in, When the interval between the reference symbol and the start symbol of the transmission resource is not less than the gap symbol size, the transmission resource of the uplink radio signal is determined to be valid.

4. The UE according to claim 1, in, The uplink radio signals include the Physical Uplink Control Channel (PUCCH), the Physical Uplink Shared Channel (PUSCH), the Physical Random Access Channel (PRACH), or the Sound Reference Signal (SRS).

5. The UE according to claim 1, in, At least one of the symbols to which the uplink radio signal is assigned is a flexible symbol.

6. The UE according to claim 1, in, The symbol set used for the uplink radio signals is configured by the Radio Resource Control (RRC) signal.

7. The UE according to claim 1, in, The semi-static uplink-downlink configuration information includes common time slot configuration information.

8. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: The base station (BS) receives semi-static uplink-downlink configuration information related to time slot configuration, wherein the time slot configuration includes, in sequence, a downlink symbol set and a flexible symbol set. The gap symbol size is determined to be one of several values ​​based on the configuration between the UE and the BS. The size of the gap symbol corresponds to the time interval required for downlink to uplink handover. Based on whether the interval between the reference symbol and the start symbol of the transmission resource is less than the gap symbol size, it is determined whether the transmission resource of the uplink radio signal is valid in the time slot, and When the transmission resource in the time slot is determined to be valid, the transmission of the uplink radio signal is performed in the transmission resource. Wherein, when the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block is configured within the downlink symbol set, the reference symbol is the last symbol of the downlink symbol set, and Wherein, when the symbol of the SS / PBCH block is configured on the flexible symbol set, the reference symbol is the last symbol of the SS / PBCH block.

9. The method according to claim 8, in, When the interval between the reference symbol and the start symbol of the transmission resource is less than the gap symbol size, the transmission resource of the uplink radio signal is determined to be invalid.

10. The method according to claim 8, in, When the interval between the reference symbol and the start symbol of the transmission resource is not less than the gap symbol size, the transmission resource of the uplink radio signal is determined to be valid.

11. The method according to claim 8, in, The uplink radio signals include the Physical Uplink Control Channel (PUCCH), the Physical Uplink Shared Channel (PUSCH), the Physical Random Access Channel (PRACH), or the Sound Reference Signal (SRS).

12. The method according to claim 8, in, At least one of the symbols to which the uplink radio signal is assigned is a flexible symbol.

13. The method according to claim 8, in, The symbol set used for the uplink radio signals is configured by the Radio Resource Control (RRC) signal.

14. The method according to claim 8, in, The semi-static uplink-downlink configuration information includes common time slot configuration information.

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