Methods for transmitting and receiving shared channels in a wireless communication system, and apparatus for supporting such methods.

Abstract

This invention relates to a method for transmitting and receiving a shared channel in a wireless communication system, and an apparatus supporting the method. In one method for transmitting and receiving a shared channel in a wireless communication system, the method, performed by a terminal, is characterized by comprising: receiving first resource information from a base station for transmitting and receiving the shared channel; and receiving the shared channel from the base station on a first resource determined based on the first resource information, or transmitting the shared channel to the base station on the first resource.

Description

[0001] This application is a divisional application of patent application No. 202080041087.0 (International Application No. PCT / KR2020 / 005924), filed on December 2, 2021, with an international application date of May 4, 2020, entitled "Method for transmitting and receiving a shared channel in a wireless communication system and apparatus supporting the method". Technical Field

[0002] This specification relates to a wireless communication system, and more specifically, to a method and apparatus for transmitting or receiving a shared channel. 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 increasing demand for wireless data services. 5G communication systems are also referred to as post-4G network communication systems, post-LTE systems, or new radio (NR) systems. To achieve high data transmission rates, 5G communication systems include systems operating in 6 GHz or higher millimeter-wave (mmWave) frequency bands, and systems operating in 6 GHz or lower frequency bands are also being considered to ensure coverage. The implementation methods in base stations and terminals are being considered.

[0004] The 3GPP (3rd Generation Partnership Project) NR system improves network spectrum efficiency and enables communication providers to offer more data and voice services within a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to supporting a large volume of voice calls. The advantages of the NR system 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 the enhanced end-user environment and simpler architecture.

[0005] For more efficient data processing, the dynamic TDD of the NR system can use a method 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 downlink traffic in a cell is greater than 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 the mmWave band, beamforming, massive MIMO, full-dimensional 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, for network improvements, 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, coordinated multipoint (CoMP), and interference cancellation are being developed 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 the human-centric network of interconnected networks where humans generate and consume information, the Internet has evolved into the Internet of Things (IoT) network, which exchanges 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. Realizing IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. This has led to the recent research into technologies such as sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) to connect objects. In the IoT environment, intelligent Internet of Things (IT) services can be provided, collecting and analyzing 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 cars 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 sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) are implemented using techniques such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology is an example of the convergence of 5G and IoT technologies. Typically, mobile communication systems are 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. Summary of the Invention

[0010] Technical issues

[0011] This specification is intended to provide a method for transmitting or receiving an uplink shared channel.

[0012] Technical solutions

[0013] This specification provides a method for transmitting or receiving a shared channel in a wireless communication system.

[0014] Specifically, a method performed by a terminal includes: receiving first resource information from a base station for transmission or reception of a shared channel, wherein the first resource information includes a symbol length and a relative start symbol index in a time-domain resource for transmission or reception of the shared channel; and receiving the shared channel from the base station on a first resource determined based on the first resource information, or transmitting the shared channel to the base station on the first resource, wherein the start symbol index of the first resource is determined based on a relative start symbol index and a predefined reference symbol index.

[0015] In this specification, the reference symbol index is 0.

[0016] In this specification, the reference symbol index is determined based on the length of the resource, including the first resource information, and the starting symbol.

[0017] In this specification, the first resource is determined based on the first subcarrier spacing (SCS) of a first cell including first resource information and the second SCS of a second cell including a shared channel.

[0018] In this specification, if the first SCS and the second SCS are the same, the reference symbol index is the index of the earliest symbol among the symbols of the first resource information of the first cell.

[0019] In this specification, if the first SCS is less than the second SCS, the reference symbol index is the index of the earliest symbol among the symbols of the shared channel of the second cell, which overlaps with the symbols of the first resource information of the first cell in the time domain.

[0020] In this specification, if the first SCS is less than the second SCS, the reference symbol index is the index of the last symbol among the symbols of the shared channel of the second cell, which overlaps with the symbols of the first resource information of the first cell in the time domain.

[0021] In this specification, if the first SCS is greater than the second SCS, then the reference symbol index is the index of the earliest symbol among the symbols of the shared channel of the second cell that does not precede the symbol of the first resource information, and the symbols of the shared channel of the second cell overlap with the symbols of the first cell in the time domain.

[0022] In this specification, the first resource information also includes a first position of the demodulation reference signal (DM-RS) mapped to the first resource.

[0023] In this specification, if the first resource includes a first location, then the DM-RS is mapped to the first location, and if the first resource does not include a first location, then the DM-RS is mapped to the symbol indicated by the start symbol index of the first resource.

[0024] In this specification, if the shared channel is first transmitted on a first resource and then repeatedly transmitted on a second resource, then the DM-RS is mapped to a first location in the first resource and to a first symbol of the second resource in the second resource.

[0025] In this specification, if a shared channel is first transmitted on a first resource and then repeatedly transmitted on a second resource, then in the first resource, the DM-RS is mapped to a first position, and in the second resource, the DM-RS is mapped to a position corresponding to the first position, and the corresponding position is the position of the first position of the first resource separated from the first symbol of the second duration by the duration separated from the first symbol of the second duration.

[0026] In this specification, DM-RS is mapped to a symbol indicated by the starting symbol index of the first resource, independent of the first location.

[0027] In this specification, the method further includes receiving second resource information from a base station for transmission or reception of a shared channel, wherein the second resource information includes information about the use of a plurality of symbols constituting a time slot of the first resource, and a reference symbol index is determined based on the first resource information and the second resource information.

[0028] In this specification, if a shared channel is transmitted to a base station on a first resource, the reference symbol index is the index of a plurality of symbols that has a flexible orientation and immediately follows the last symbol whose purpose is configured for downlink.

[0029] In this specification, if a shared channel is transmitted to a base station on a first resource, the reference symbol index is the index of a symbol among a plurality of symbols that has a purpose configured for flexible or uplink and immediately follows the gap symbol located after the last symbol whose purpose is configured for downlink.

[0030] In this specification, a terminal for transmitting or receiving a shared channel in a wireless communication system includes: a transceiver; a processor; and

[0031] A memory, connected to a processor and configured to store instructions for operations performed by the processor, wherein the operations include: receiving first resource information from a base station for transmission of a shared channel, wherein the first resource information includes a symbol length and a relative start symbol index in a time-domain resource for transmission of the shared channel; and receiving a shared channel from the base station on a first resource determined based on the first resource information, or transmitting a shared channel to the base station on the first resource, wherein the start symbol index of the first resource is determined based on a relative start symbol index and a predefined reference symbol index.

[0032] In this specification, the reference symbol index is 0.

[0033] In this specification, the reference symbol index is determined based on resources including first resource information.

[0034] In this specification, the first resource is determined based on the first subcarrier spacing (SCS) of the first cell, which includes first resource information, and the second SCS of the second subcarrier of the second cell, which includes a shared channel.

[0035] Beneficial effects

[0036] This specification provides a method for efficiently determining resources for shared channel transmission. Attached Figure Description

[0037] Figure 1 This diagram illustrates an example of a wireless frame structure used in a wireless communication system.

[0038] Figure 2 This diagram illustrates an example of a downlink (DL) / uplink (UL) timeslot structure in a wireless communication system.

[0039] Figure 3 This is a diagram used to illustrate the physical channels used in 3GPP systems and typical signal transmission methods using those physical channels.

[0040] Figure 4a and Figure 4b The diagram illustrates the SS / PBCH block used for initial cell access in a 3GPP NR system.

[0041] Figure 5a and Figure 5b The diagram illustrates the process of transmitting control information and control channels in a 3GPP NR system.

[0042] Figure 6 The diagram shows a control resource set (CORESET) in a 3GPP NR system that can transmit the Physical Downlink Control Channel (PUCCH).

[0043] Figure 7 The diagram illustrates a method for configuring the PDCCH search space in a 3GPP NR system.

[0044] Figure 8 This is a conceptual diagram illustrating carrier aggregation.

[0045] Figure 9 This diagram is used to illustrate signal carrier communication and multi-carrier communication.

[0046] Figure 10 This is a diagram illustrating an example of the application of cross-carrier scheduling technology.

[0047] Figure 11 This is a block diagram illustrating the configuration of a UE and a base station according to an embodiment of the present disclosure.

[0048] Figure 12 This is a diagram illustrating the time slot configuration of a TDD-based mobile communication system according to an embodiment of the present disclosure.

[0049] Figure 13 This is a diagram illustrating the Physical Uplink Control Channel (PUCCH) used in a wireless communication system according to an embodiment of the present disclosure.

[0050] Figure 14 This is a diagram illustrating the method of sending PUCCH in a time slot.

[0051] Figure 15a and Figure 15b This is a diagram illustrating an example of sending PUCCH through another time slot based on a change in time slot configuration.

[0052] Figure 16 This is a diagram illustrating the time slots that perform repeated PUCCH transmissions according to the time slot configuration.

[0053] Figure 17 The diagram shows whether to send PUCCH based on the time slot configuration.

[0054] Figure 18 The illustration shows a repeated micro-slot-level PUSCH transmission according to an embodiment of the present disclosure.

[0055] Figure 19The illustration shows a repeating micro-slot-level PUSCH transmission according to another embodiment of the present disclosure.

[0056] Figure 20 This is a diagram illustrating the conditions for the termination of repeated micro-slot-level PUSCH transmission according to an embodiment of the present disclosure.

[0057] Figure 21 This is a diagram illustrating the counting rules for repeated micro-slot-level PUSCH transmissions according to an embodiment of the present disclosure.

[0058] Figure 22 This is a diagram illustrating PUSCH transmission taking into account time slot boundaries according to an embodiment of the present disclosure.

[0059] Figures 23 to 26 This is a diagram illustrating repeated PUSCH transmission considering multi-segment transmission and repeated micro-slot-level PUSCH transmission according to an embodiment of the present disclosure.

[0060] Figure 27 This is a diagram illustrating repeated PUSCH transmissions according to an embodiment of the present disclosure.

[0061] Figure 28 This is a diagram of a method for locating DM-RS during repeated PUSCH transmissions according to an embodiment of the present disclosure.

[0062] Figure 29 This is a diagram illustrating a method for determining the reference symbol index of a PDSCH according to an embodiment of the present disclosure.

[0063] Figure 30 This is a flowchart illustrating the operation process of performing a method for transmitting a shared channel in a terminal according to an embodiment of the present disclosure. Detailed Implementation

[0064] The terminology used in this specification adopts, as far as possible, commonly used terms that are widely used in light of the functions of this invention; however, 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 this invention. Therefore, it is intended to reveal that the terminology used in this specification should not be analyzed solely based on its name, but rather on its substantive meaning within the entire specification.

[0065] Throughout the specification and subsequent claims, when an element is described as being “connected” to another element, that 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 element without implying the exclusion of any other elements. Additionally, in some exemplary embodiments, limitations such as “greater than or equal to” or “less than or equal to” based on a specific threshold may be appropriately replaced with “greater than” or “less than”, respectively.

[0066] 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 CDMA2000. TDMA can be implemented using wireless technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rate GSM Evolution (EDGE). 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 Low Latency Communication (URLLC), and Massive Machine-Type Communication (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.

[0067] Unless otherwise specified in this specification, a base station may refer to a next-generation node B (gNB) as defined in 3GPP NR. Furthermore, unless otherwise stated, a terminal may refer to a user equipment (UE). In the following, for the purpose of facilitating understanding of the description, each element is separately divided into embodiments and described, but each of the embodiments may be used in conjunction with each other. In this disclosure, the configuration of the UE may be instructive of the configuration by the base station. Specifically, the base station may transmit channels or signals to the UE to configure parameter values ​​used in the UE's operation or wireless communication system.

[0068] Figure 1This diagram illustrates an example of a wireless frame structure used in a wireless communication system.

[0069] refer to Figure 1 The radio frames (or radio frames) used in 3GPP NR systems can have a duration of 10ms (Δf). max N f / 100)*T c The length of the radio frame is Δf. Furthermore, a radio frame consists of 10 equal-sized subframes (SF). 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 10 subframes within a single radio frame. Each subframe is 1ms long 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. This can range from 0 to 2. μ The number -1 is assigned to 2 within a subframe. μ Each time slot. Furthermore, slots from 0 to 10*2 can be allocated. μ The number -1 is assigned to a time slot within a radio frame. Time resources can be distinguished by at least one of the radio frame number (also known as the radio frame index), subframe number (also known as the subframe index), and time slot number (or time slot index).

[0070] Figure 2 This diagram illustrates an example of a downlink (DL) / uplink (UL) timeslot structure in a wireless communication system. Specifically, Figure 2 The structure of the resource grid of the 3GPP NR system is shown.

[0071] Each online port has a resource grid. (See reference) Figure 2A 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 interval. Unless otherwise specified, an OFDM symbol may be simply referred to as a symbol. An RB comprises 12 consecutive subcarriers in the frequency domain. (See reference...) 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 The resource grid of OFDM symbols is used for representation. Here, x = DL when the signal is a DL signal, and x = UL when the signal is a UL signal. N size,μ grid,x This represents the number of resource blocks (RBs) based on the subcarrier spacing component μ (x is DL or UL), and N slot symb Indicates the number of OFDM symbols in the time slot. N RB sc It is the number of subcarriers that make up an RB and N RB sc =12. OFDM symbols can be referred to as cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform extended OFDM (DFT-s-OFDM) symbols according to the multiple access scheme.

[0072] The number of OFDM symbols included in a time slot can vary depending on the length of the cyclic prefix (CP). For example, with normal CP, a time slot includes 14 OFDM symbols, but with extended CP, a time slot can include 12 OFDM symbols. In certain embodiments, extended CP can only be used with a 60 kHz subcarrier spacing. Figure 2 For ease of description, as an example, a time slot is configured with 14 OFDM symbols; however, embodiments of this disclosure can be applied in a similar manner to time slots with different numbers of OFDM symbols. References Figure 2 Each OFDM symbol includes N in the frequency domain. size,μ grid,x *N RB sc Subcarriers can be categorized into data subcarriers for data transmission, reference signal subcarriers for reference signal transmission, and guard bands. The carrier frequency is also known as the center frequency (fc).

[0073] An RB can be composed of N in the frequency domain RB sc(For example, 12) consecutive subcarriers are defined. For reference, a resource configured with one OFDM symbol and one subcarrier can be called a resource element (RE) or tone. Therefore, an RB can be configured with N slot symb *N RB sc 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 index assigned, and l can be from 0 to N in the time domain. slot symb -1 The index assigned.

[0074] To enable the UE to receive or transmit signals from 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 necessary time and frequency parameters to demodulate the DL signal and transmit the UL signal at the correct time.

[0075] Each symbol of a radio frame used in Time Division Duplex (TDD) or unpaired spectrum can be configured with at least one of DL symbol, UL symbol, and flexible symbol. Radio frames used as DL carriers in Frequency Division Duplex (FDD) or paired spectrum can be configured with either DL symbol or flexible symbol, while radio frames used as UL carriers can be configured with either UL symbol or flexible symbol. 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 as being used as either DL or UL based on the signal.

[0076] Information regarding the type of each symbol—that is, information indicating any of DL symbols, UL symbols, and flexible symbols—can be configured using cell-specific or public Radio Resource Control (RRC) signals. Furthermore, information regarding the type of each symbol can be additionally configured using UE-specific or dedicated RRC signals. The base station uses cell-specific RRC signals to inform i) the period of the cell-specific time slot configuration, ii) the number of time slots containing only DL symbols 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 following a time slot containing only DL symbols, iv) the number of time slots containing only UL symbols 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.

[0077] When the information on symbol type is configured with UE-specific RRC signaling, the base station can signal whether a flexible symbol is a DL symbol or a UL symbol with cell-specific RRC signaling. In this case, the UE-specific RRC signaling cannot change a DL symbol or a UL symbol configured with cell-specific RRC signaling to another symbol type. The UE-specific RRC signaling can signal the number of DL symbols among N symbols of a corresponding time slot for each time slot and the number of UL symbols among N symbols of the corresponding time slot. In this case, the DL symbols of a time slot can be continuously configured as the first symbol to the i-th symbol of the time slot. In addition, the UL symbols of a time slot can be continuously configured as the j-th symbol to the last symbol of the time slot (where i < j). In a time slot, a symbol not configured with any of the UL symbol and the DL symbol is a flexible symbol. slot symb symbols and the number of UL symbols among N symbols of the corresponding time slot. slot symb symbols.

[0078] Figure 3 is a diagram for explaining physical channels used in a 3GPP system (e.g., NR) and a typical signal transmission method using the physical channels.

[0079] If the power of the UE is turned on or the UE camps on a new cell, the UE performs initial cell search (S101). Specifically, the UE can synchronize with the BS in the initial cell search. To this end, the UE can receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as a cell ID. Thereafter, the UE can receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0080] After the initial cell search is completed, the UE receives a physical downlink shared channel (PDSCH) based on a physical downlink control channel (PDCCH) and 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). Here, the system information received by the UE is cell-common system information in radio resource control (RRC) for the UE to operate properly at the physical layer and is referred to as remaining system information (RSMI) or system information block (SIB) 1.

[0081] When a UE initially accesses a base station or does not have radio resources for signal transmission (when the UE is in RRC_IDLE mode), the UE can perform a random access procedure to 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 grant sent from the base station via the PDCCH (S105). Next, the UE waits for the reception of the PDCCH as an indication from the base station for conflict resolution. If the UE successfully receives the PDCCH via the UE's identifier (S106), the random access procedure is terminated. During the random access procedure, the UE can obtain UE-specific system information necessary for proper operation at the physical layer at the RRC layer. When the UE obtains the UE-specific system information from the RRC layer, the UE enters RRC_CONNECTED mode.

[0082] The RRC layer is used for message generation and management to control communication between the UE and the Radio Access Network (RAN). More specifically, in the RRC layer, the base station and UE can perform broadcasting of cell system information, management of paging message delivery, mobility management and handover, measurement reporting and its control, UE capability management, and storage management, including necessary management of existing data for all UEs in the cell. Typically, because the updates of signals transmitted from the RRC layer (hereinafter referred to as RRC signals) are longer than the transmission / reception period (i.e., transmission time interval, TTI) in the physical layer, RRC signals can remain unchanged for extended periods.

[0083] 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 a general UL / DL signal transmission process. Specifically, the UE can receive downlink control information (DCI) via the PDCCH. The DCI may include control information for the UE, such as resource allocation information. Furthermore, the format of the DCI can vary depending on the intended purpose. The uplink control information (UCI) transmitted by the UE 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 can be included in the Channel State Information (CSI). In a 3GPP NR system, the UE can transmit control information such as the aforementioned HARQ-ACK and CSI via the PUSCH and / or PUCCH.

[0084] Figure 4 illustrates the SS / PBCH block used for initial cell access in a 3GPP NR system.

[0085] When power is on or when the UE wants to connect to a new cell, it can obtain time and frequency synchronization with that 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 ID Therefore, 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).

[0086] refer to Figure 4a This 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 As per Table 1, 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, within 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 for transmitting the PSS, the base station does not transmit signals via the remaining subcarriers, i.e., subcarriers 0 to 55 and subcarriers 183 to 239. Furthermore, in the third OFDM symbol for transmitting the SSS, the base station does not transmit signals via subcarriers 48 to 55 and subcarriers 183 to 191. The base station transmits the Physical Broadcast Channel (PBCH) via the remaining REs in the SS / PBCH block, excluding the signals mentioned above.

[0087] [Table 1]

[0088]

[0089] The SS allows a total of 1008 unique physical layer cell IDs to be divided into 336 physical layer cell identifier groups through a combination of three PSSs and SSSs. Each group includes three unique identifiers, specifically ensuring that each physical layer cell ID is only a part of one physical layer cell identifier group. Therefore, the physical layer cell ID N cel1 ID =3N (1) ID +N (2)ID An index N, ranging from 0 to 335, can be used to indicate 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) ID Uniquely defined. The UE can detect the PSS and identify one of three unique physical layer identifiers. Furthermore, 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 as follows.

[0090] d PSS (n) = 1 - 2x(m)

[0091]

[0092] 0 ≤ n < 127

[0093] Here, x(i+7) = (x(i+4) + x(i)) mod 2

[0094] And it is given as [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

[0095] In addition, the sequence d of SSS SSS (n) is as follows.

[0096] d SSS (n)=[1-2x0((n+m0)mod127)I1-2x1((n+m1)mod127)]

[0097]

[0098]

[0099] 0 ≤ n < 127

[0100] x0(i+7)=(x0(i+4)+x0(i))mod 2

[0101] Here, x1(i+7) = (x1(i+1) + x1(i)) mod 2, and is given as

[0102] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)]=[0 0 0 0 0 0 1]

[0103] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)]=[0 0 0 0 0 0 1].

[0104] A radio frame with a length of 10ms can be divided into two half-frames with a length of 5ms.

[0105] refer to Figure 4b This section describes the time slots for transmitting the SS / PBCH block in each half-frame. The time slot for transmitting the SS / PBCH block 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 the ({2, 8} + 14*n)th symbol. In this case, at carrier frequencies of 3 GHz or lower, n = 0 or 1. Furthermore, at carrier frequencies above 3 GHz and below 6 GHz, n can be 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. Furthermore, at carrier frequencies above 3 GHz and below 6 GHz, n can be 0 or 1. In case C, the subcarrier spacing is 30 kHz and the start time of the SS / PBCH block is the ({2, 8} + 14*n)th symbol. In this case, at carrier frequencies of 3 GHz or lower, n = 0 or 1. Furthermore, at carrier frequencies above 3 GHz but below 6 GHz, n can be 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*n)th symbol. In this case, at carrier frequencies 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} + 56*n)th symbol. In this case, at carrier frequencies of 6 GHz or higher, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0106] Figure 5 illustrates the process of transmitting control information and using the control channel in a 3GPP NR system. (Reference) Figure 5aThe base station can add a Cyclic Redundancy Check (CRC) masked with a Radio Network Temporary Identifier (RNTI) (e.g., XOR operation) to the control information (e.g., downlink control information (DCI)) (S202). The base station can scramble the CRC with an 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) and CS-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 compilation) (S204) (S206). Thereafter, the base station can multiplex the DCI based on the PDCCH structure based on Control Channel Elements (CCE) (S208). Furthermore, the base station can apply additional processes such as scrambling, modulation (e.g., QPSK), interleaving, etc., to the multiplexed DCI (S210), and then map the DCI to the resources to be transmitted. CCE is the basic resource unit used for 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 diagram relating to CCE aggregation levels and PDCCH multiplexing, illustrating the type of CCE aggregation level used for a PDCCH and the CCEs sent in the control area accordingly.

[0107] Figure 6 The diagram shows a control resource set (CORESET) in a 3GPP NR system that can transmit the Physical Downlink Control Channel (PUCCH).

[0108] A CORESET is a time-frequency resource in which PDCCH (i.e., control signals for the UE) is transmitted. Furthermore, 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 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 for the UE. A CORESET can be configured with up to three consecutive symbols on the time axis. Additionally, 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 of a time slot. For example, in the embodiment of Figure 5, CORESET#1 begins at the first symbol of the time slot, CORESET#2 begins at the fifth symbol of the time slot, and CORESET#9 begins at the ninth symbol of the time slot.

[0109] Figure 7 The diagram illustrates a method for setting up the PUCCH search space in a 3GPP NR system.

[0110] To transmit PDCCH to a UE, each CORESET may have at least one search space. In embodiments of this disclosure, the search space is the set of all time-frequency resources (hereinafter referred to as PDCCH candidates) capable of being used to transmit a UE's PDCCH. The search space may include a common search space that requires UEs of 3GPP NR to search together and a terminal-specific search space or UE-specific search space that requires a specific UE to search. In the common search space, a UE may monitor a PDCCH that is configured to be searched together by all UEs belonging to the same base station cell. Furthermore, a UE-specific search space may be set for each UE, such that the UE monitors the PDCCH allocated to each UE at search space locations that differ depending on the UE. In the case of a UE-specific search space, the search spaces between UEs may partially overlap and be allocated due to the limited control area that can be allocated PDCCH. Monitoring the PDCCH includes blind decoding of PDCCH candidates in the search space. When blind decoding is successful, it can be expressed as (successfully) detecting / receiving the PDCCH, and when blind decoding fails, it can be expressed as not detecting / receiving or not successfully detecting / receiving the PDCCH.

[0111] For ease of explanation, a PDCCH scrambled with a Group Common (GC) RNTI previously known to one or more UEs to transmit DL control information to one or more UEs is called a Group Common (GC) PDCCH or a common PDCCH. Furthermore, a PDCCH scrambled with a RNTI of a specific terminal already known to a specific UE to transmit UL scheduling information or DL ​​scheduling information to that specific UE is called a UE-specific 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.

[0112] The base station can signal to each UE or group of UEs via the PDSCH information regarding resource allocation for the Paging Channel (PCH) and Downlink Shared Channel (DL-SCH) as transport channels (i.e., DL clearance) or resource allocation for the Uplink Shared Channel (UL-SCH) and Hybrid Automatic Repeat Request (HARQ) (i.e., UL clearance). The base station can transmit PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station can also transmit data excluding specific control information or specific service data via the PDSCH. Furthermore, the UE can receive data excluding specific control information or specific service data via the PDSCH.

[0113] 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 PDSCH data will be received and decoded by the corresponding UE, and then send the PDCCH. For example, suppose the DCI sent on a particular PDCCH is CRC masked with RNTI "A", and the DCI indicates that the PDSCH is allocated to radio resource "B" (e.g., frequency location) and indicates transmission format information "C" (e.g., transport block size, modulation scheme, coding information, etc.). 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 using RNTI "A", then that UE receives the PDCCH and, based on the information in the received PDCCH, receives the PDSCH indicated by "B" and "C".

[0114] Table 2 shows an example of the Physical Uplink Control Channel (PUCCH) used in a wireless communication system.

[0115] [Table 2]

[0116] PUCCH format K-degree of OFDM symbol Number of bits 0 1-2 ≤2 1 4-14 ≤2 2 1-2 ＞2 3 4-14 ＞2 4 4-14 ＞2

[0117] PUCCH can be used to send the following UL control information (UCI).

[0118] - Scheduling Request (SR): Information used to request UL UL-SCH resources.

[0119] -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 (simply ACK), negative ACK (NACK hereinafter), discontinuous transmission (DTX), or NACK / DTX. Here, the terms HARQ-ACK are 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.

[0120] - Channel State Information (CSI): Feedback information about the DL channel. The UE generates it based on the CSI-reference signal (RS) transmitted by the base station. MIMO-related feedback information includes the Rank Indicator (RI) and the Precoding Matrix Indicator (PMI). The CSI can be divided into CSI Part 1 and CSI Part 2 based on the information indicated by the CSI.

[0121] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, channel environments, and frame structures.

[0122] 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 via one or two OFDM symbols on the time axis and one RB on the frequency axis. When transmitting PUCCH format 0 in two OFDM symbols, the same sequence on both symbols can be transmitted via different RBs. In this case, the sequence can be a cyclically shifted (CS) sequence from the base sequence used for PUCCH format 0. This allows the UE to obtain frequency diversity gain. Specifically, the UE can, according to M... bit Bit UCI (M) bit =1 or 2) to determine the cyclic shift (CS) value m cs Furthermore, the 12-length base sequence is based on a predetermined CS value m. cs The cyclically shifted sequence can be mapped to one OFDM symbol of one RB and 12 REs and transmitted. When the number of cyclic shifts available to the UE is 12 and M... bit When M = 1, 1 bit UCI 0 and 1 can be mapped to two cyclic shift sequences with a difference of 6, respectively. Furthermore, when M... bitWhen = 2, the 2-bit UCI 00, 01, 11 and 10 can be mapped to four cyclic shift sequences with a difference of 3 in their cyclic shift values.

[0123] PUCCH format 1 can deliver 1 or 2 bits of HARQ-ACK information or SR. PUCCH format 1 can be transmitted using 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 of 4 to 14. More specifically, it can be used for M... bit BPSK modulation is performed using a UCI of 1. The UE can then use Quadrature Phase Shift Keying (QPSK) to modulate the M... bit Modulation is performed using a UCI of 2. The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a sequence of length 12. In this case, the sequence can be the base sequence used for PUCCH format 0. The UE transmits the obtained signal by extending the even-numbered OFDM symbols assigned to PUCCH format 1 with a time-axis orthogonal cover code (OCC). PUCCH format 1 determines the maximum number of different UEs multiplexed in an RB based on the length of the OCC to be used. The demodulation reference signal (DMRS) can be extended with the OCC and mapped to the odd-numbered OFDM symbols of PUCCH format 1.

[0124] PUCCH format 2 can deliver 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 transmitting PUCCH format 2 in two OFDM symbols, the sequences transmitted in different RBs through the two OFDM symbols can be identical. Here, the sequence can be multiple modulated complex-valued symbols d(0), ..., d(M). symbol -1). Here, M symbol It can be M bit / 2. Through this, the UE can obtain frequency diversity gain. More specifically, for M... bit One bit UCI (M bit >2) Perform bit-level scrambling, QPSK modulation, and map it to one or two OFDM symbols' RBs. Here, the number of RBs can be one from 1 to 16.

[0125] PUCCH format 3 or PUCCH format 4 can deliver more than 2 bits of UCI. PUCCH format 3 or PUCCH format 4 can be transmitted via 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 utilizes e / 2-binary phase shift keying (BPSK) or QPSK to transmit M... bit One bit UCI (M bit >2) Modulate 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 unit extension to PUCCH format 3. However, the UE may use a 12-length PreDFT-OCC to apply block unit extension to one RB (i.e., 12 subcarriers), 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.

[0126] In this scenario, the number of Restricted Blocks (RBs) occupied 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 without sending some UCI information, based on the priority of the UCI information.

[0127] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured using the RRC signal to indicate frequency hopping in the time slot. When frequency hopping is configured, the index of the RB to be hopped can be configured using the 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 hop can have floor (N / 2) OFDM symbols and the second hop can have ceiling (N / 2) OFDM symbols.

[0128] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured to be repeatedly transmitted in multiple time slots. In this case, the number K of time slots in which the PUCCH is repeatedly transmitted can be configured via an RRC signal. The repeatedly transmitted PUCCH must begin at a constant position in the OFDM symbol within each time slot and have a constant length. When one of the OFDM symbols 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 the transmission of the PUCCH to the next time slot.

[0129] In 3GPP NR systems, a UE can perform transmission / reception using a bandwidth less than or equal to the carrier (or cell) bandwidth. For this purpose, the UE can be configured with a bandwidth portion (BWP) consisting of a continuous bandwidth comprising a portion of the carrier's bandwidth. A UE operating under TDD or in unpaired spectrum can receive up to four DL / UL BWP pairs for one carrier (or cell). Furthermore, 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 downlink carrier (or cell) and up to four UL BWPs on an uplink carrier (or cell). For each carrier (or cell), the UE can activate one DL BWP and one UL BWP. The UE may not receive or transmit in time-frequency resources other than the activated BWPs. The activated BWP can be referred to as the active BWP.

[0130] The base station can indicate the active BWP among the BWPs configured by the UE via downlink control information (DCI). The BWP indicated by the DCI is activated, while other configured BWPs are deactivated. In a TDD-operated carrier (or cell), the base station can include a Bandwidth Part Indicator (BPI) indicating the active BWP in the DCI of the scheduling PDSCH or PUSCH to change the UE's DL / UL BWP pair. The UE can receive the DCI of the scheduling PDSCH or PUSCH and can identify the active DL / UL BWP pair based on the BPI. In the case of a downlink carrier (or cell) operating in FDD, the base station can include a BPI indicating the active BWP in the DCI of the scheduling PDSCH to change the UE's DL BWP. In the case of an uplink carrier (or cell) operating in FDD, the base station can include a BPI indicating the active BWP in the DCI of the scheduling PUSCH to change the UE's UL BWP.

[0131] Figure 8 This is a conceptual diagram illustrating carrier aggregation.

[0132] Carrier aggregation is a method in which a UE uses multiple frequency blocks or (in a logical sense) cells configured with UL resources (or component carriers) and / or DL ​​resources (or component carriers) as a large logical band so that the wireless communication system can use a wider bandwidth. A component carrier can also be referred to by the terms primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, for convenience, the term "component carrier" will be used below.

[0133] 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 400 MHz. Component carriers can include one or more physically contiguous subcarriers. Although in Figure 8 The 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 spaced apart.

[0134] Different center frequencies can be used for each component carrier. Alternatively, a common center frequency can be used for physically adjacent component carriers. Assuming in Figure 8 In one embodiment, all component carriers are physically adjacent, so center frequency A can be used in all component carriers. Alternatively, assuming that the component carriers are not physically adjacent to each other, then center frequency A and center frequency B can be used in each component carrier.

[0135] When extending the total 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 100MHz as the total system bandwidth and perform communication using all five component carriers. UEs B1-B5 can perform communication using only 20MHz bandwidth and one component carrier. UEs C1 and C2 can each use 40MHz bandwidth and two component carriers for communication. These two component carriers can be logically / physically adjacent or non-adjacent. UE C1 represents the case of using two non-adjacent component carriers, while UE C2 represents the case of using two adjacent component carriers.

[0136] Figure 9 This is a diagram used to illustrate 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.

[0137] refer to Figure 9(a) In 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) It is possible to aggregate three 20MHz component carriers (CCs) 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 ULCC and DLCC 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.

[0138] A base station can communicate with a UE by activating some or all of the UE's serving CCs or by deactivating some CCs. The base station can change the CCs to be activated / deactivated, and can 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 will not 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), while CCs that the base station can freely activate / deactivate are called secondary CCs (SCCs) or secondary cells (SCells).

[0139] 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 it can be configured with a combination of DL resources 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 by 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 DL is the DL PCC, and the carrier corresponding to a PCell in UL is the UL PCC. Similarly, the carrier corresponding to an SCell in DL is the DL SCC, and the carrier corresponding to an SCell in UL is the UL SCC. Depending on the UE's capabilities, a serving cell can be configured with one PCell and zero or more SCells. In the case of a UE in the RRC_CONNECTED state but not configured for carrier aggregation or not supporting carrier aggregation, only one serving cell is configured with only a PCell.

[0140] As mentioned above, the term "cell" used in carrier aggregation is distinguished from the term "cell" referring to a geographical area that provides communication services through a base station or an antenna array. That is, a component carrier can also be referred to as a scheduled cell, a scheduled cell, a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, to distinguish between cells representing a geographical area and cells in carrier aggregation, in this disclosure, cells in carrier aggregation are referred to as CCs, and cells representing a geographical area are referred to as cells.

[0141] Figure 10 This diagram illustrates 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 ​​that 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. A PCell can essentially be a scheduling cell, and a specific SCell can be designated as a scheduling cell by a higher layer.

[0142] exist Figure 10In the embodiment, it is assumed that three DL CCs are combined. Here, it is assumed that DL component carrier #0 is a DLPCC (or PCell), and DL component carriers #1 and #2 are DL SCCs (or SCells). Furthermore, it is assumed that the DLPCC is configured 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 transmit only the PDCCH for scheduling its PDSCH according to the NR PDCCH rules without CIF (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 use CIF to transmit not only the PDCCH for scheduling DL CC A but also the PDCCH for scheduling another CC (cross-carrier scheduling). On the other hand, no PDCCH is transmitted in another DL CC. Therefore, the UE monitors the PDCCH excluding CIF to receive the PDSCH of self-carrier scheduling depending on whether cross-carrier scheduling is configured for the UE, or monitors the PDCCH including CIF to receive the PDSCH of cross-carrier scheduling.

[0143] 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 with time slots.

[0144] Figure 11 This is a block diagram illustrating the configuration of a UE and a base station according to embodiments of the present disclosure. In embodiments of the present disclosure, 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 disclosure, 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).

[0145] As shown in the accompanying drawings, the UE 100 according to an embodiment of the present disclosure may include a processor 110, a communication module 120, a memory 130, a user interface 140, and a display unit 150.

[0146] First, the processor 110 can execute various instructions or procedures and process data within the UE 100. Furthermore, 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.

[0147] Next, the communication module 120 can be an integrated module that uses a wireless communication network to perform wireless communication and uses a wireless LAN to perform wireless LAN access. For this purpose, the communication module 120 can include multiple network interface cards (NICs), such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either internally or externally. In the accompanying drawings, the communication module 120 is shown as a monolithic integrated module; however, unlike the drawings, each network interface card can be arranged independently depending on the circuit configuration or usage.

[0148] 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 accordance with cellular communication standards or protocols in a frequency band below 6 GHz supported by the corresponding NIC module.

[0149] Cellular communication interface card 122 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 second frequency band based on instructions from processor 110. According to an 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 device, and server in accordance with cellular communication standards or protocols in a frequency band above 6 GHz supported by the corresponding NIC module.

[0150] The unlicensed 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 band, and provides unlicensed band communication services based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module using an unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. At least one NIC module of the unlicensed band communication interface card 123 can independently or dependently perform wireless communication with at least one of the base station 200, external devices, and servers according to the unlicensed band communication standards or protocols of the frequency band supported by the corresponding NIC module.

[0151] The memory 130 stores the control program used in the UE 100 and various data used therein. Such a control program may include a prescribed program required to perform wireless communication with at least one of the base station 200, external devices, and servers.

[0152] Next, the user interface 140 includes various input / output means provided in the UE 100. In other words, the user interface 140 can use various input means to receive user input, and the processor 110 can control the UE 100 based on the received user input. Furthermore, the user interface 140 can use various output means to execute output based on instructions from the processor 110.

[0153] 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.

[0154] Furthermore, the base station 200 according to embodiments of the present disclosure may include a processor 210, a communication module 220, and a memory 230.

[0155] First, the processor 210 can execute various instructions or programs and process the internal data of the base station 200. Furthermore, the processor 210 can control the overall operation of each unit in the base station 200 and control the transmission and reception of data between the units. Here, the processor 210 can be configured to perform operations according to the embodiments described in this disclosure. For example, the processor 210 can notify time slot configurations with signals and perform communication based on the time slot configurations notified by the used signals.

[0156] Next, the communication module 220 can be an integrated module that uses a wireless communication network to perform wireless communication and uses a wireless LAN to perform wireless LAN access. For this purpose, the communication module 120 can include multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, either internally or externally. In the figures, the communication module 220 is shown as a monolithic integrated module; however, unlike the figures, each network interface card can be arranged independently depending on the circuit configuration or usage.

[0157] Cellular communication interface card 221 can transmit or receive radio signals with at least one of base station 100, external device, and server 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 device, and server in accordance with cellular communication standards or protocols in a frequency band less than 6 GHz supported by the corresponding NIC module.

[0158] Cellular communication interface card 222 can transmit or receive radio signals with at least one of base station 100, external device, and server 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 device, and server in accordance with cellular communication standards or protocols in a 6 GHz or higher frequency band supported by the corresponding NIC module.

[0159] 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 that 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 can independently or dependently perform wireless communication with at least one of the base station 100, external devices, and servers in accordance with the unlicensed frequency band communication standards or protocols of the frequency band supported by the corresponding NIC module.

[0160] Figure 11This is a block diagram illustrating a UE 100 and a base station 200 according to an embodiment of the present disclosure, and the blocks shown individually are logically divided elements of the device. Therefore, the aforementioned elements of the device can be installed in a single chip or multiple chips depending on the device design. Furthermore, a portion of the configuration of the UE 100, such as a user interface 140, a display unit 150, etc., may be selectively provided in the UE 100. Additionally, the user interface 140, display unit 150, etc., may be additionally provided in the base station 200 if necessary.

[0161] Figure 12 This is a diagram illustrating the time slot configuration of a TDD-based mobile communication system according to an embodiment of the present disclosure.

[0162] refer to Figure 12 The time slot can be defined by the following four configurations: time slot with only DL symbols (DL only), time slot centered on DL symbols (DL centered), time slot centered on UL symbols (UL centered), and time slot with only UL symbols (UL only).

[0163] A time slot can contain seven symbols. Gaps (GPs) 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 that configures the gap is referred to as the gap symbol.

[0164] A time slot including only DL symbols (DL only) literally includes only DL symbols. For example, a time slot including only DL symbols is as follows: Figure 12 The only DL includes 7 DL symbols.

[0165] A time slot centered on a DL symbol (DL-centric) 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 can be as follows: Figure 12 The symbol, centered on DL, includes five DL symbols, one gap symbol, and one UL symbol in the same order.

[0166] A UL-centered time slot can include at least one DL symbol, at least one gap symbol, and multiple UL symbols. For example, a UL-centered time slot can be as follows: Figure 12 The symbol, centered on UL, includes one DL symbol, one gap symbol, and five UL symbols in the same order.

[0167] Time slots including the UL-only symbol (UL only) literally include the UL-only symbol. For example, time slots including the UL-only symbol include... Figure 12The UL standard includes seven UL symbols.

[0168] The network can notify the terminal of the default timeslot configuration, and for this purpose, RRC signaling can be used. Information about the default timeslot configuration configured via RRC signaling can be referred to as semi-static DL / UL assignment information. The default timeslot configuration is the timeslot configuration that the terminal can assume the network is using when the base station does not send signaling for individual timeslot configuration changes. The 3GPP NR system supports dynamic TDD, which changes the timeslot configuration based on various service conditions of the terminal. For this purpose, the base station can notify the terminal of the current or future timeslot configuration every timeslot, every few timeslots, or whenever the base station changes the timeslot configuration. Two methods can be used in the NR system to notify the terminal of the timeslot configuration.

[0169] 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 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) for sending information related to time slot configuration. The time slot format information indicator can indicate the current time slot configuration, in which group common PDCCH it is sent, or multiple future time slot configurations that include the current time slot configuration. When a group common PDCCH is received, the terminal can know the current time slot configuration or future time slot configurations that include the current time slot via 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 has sent the group common PDCCH.

[0170] The second method involves sending information about slot configuration in a terminal-specific (UE-specific) PDCCH used for scheduling PDSCH or PUSCH. The UE-specific PDCCH can be sent unicast only to the specific user requiring scheduling. The UE-specific PDCCH can send the same slot format information indicator as that sent in the group common PDCCH as slot configuration information for the scheduled slots. Alternatively, the UE-specific PDCCH can include information that allows inference of the configuration of the scheduled slots. For example, a terminal can know the slots in which PDSCH or PUSCH is assigned and the position of OFDM symbols within the slots by receiving the UE-specific PDCCH assigned to it, and can thus infer the slot configuration. The UE-specific PDCCH used for PDSCH scheduling can indicate the slots in which PUCCHs, including HARQ-ACK feedback information, are sent and the position of OFDM symbols within the slots, and can thus infer the configuration of the slots in which PUCCHs are sent.

[0171] 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, and MAC messages and RRC messages (or RRC signaling) generated and processed in the MAC and RRC layers, respectively. MAC messages and RRC messages can 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, physical downlink channels may further include the Physical Downlink Shared Channel (PDSCH), the Physical Downlink Control Channel (PDCCH), and the Physical Broadcast Channel (PBCH).

[0172] The uplink signals used in this specification are radio signals transmitted by the terminal to the base station, and may include physical uplink channels, sequences, reference signals (SRS, etc.) generated and processed at the physical layer, and MAC messages and RRC messages (or RRC signaling) generated and processed at the MAC layer and RRC layer, respectively. The physical uplink channel may again include the Physical Uplink Shared Channel (PUSCH), the Physical Uplink Control Channel (PUCCH), and the Physical Random Access Channel (PRACH).

[0173] Figure 13 This is a diagram illustrating the Physical Uplink Control Channel (PUCCH) used in a wireless communication system according to an embodiment of the present disclosure.

[0174] refer to Figure 13 The 3GPP NR system can use two types of PUCCH depending on the amount of time resources (i.e., the number of symbols) used for PUCCH transmission.

[0175] Type 1 PUCCH, also known as long PUCCH, can be transmitted using four or more consecutive symbols mapped to time slots. Type 1 PUCCH can be primarily used to transmit large amounts of uplink control information (UCI) or can be assigned to users with low signal strength to increase PUCCH coverage. Type 1 PUCCH can be repeatedly transmitted in multiple time slots to further increase PUCCH coverage. Type 1 PUCCH can include PUCCH format 1 (transmitting UCI of 1 or 2 bits), PUCCH format 3 (transmitting UCI of more than 2 bits without multiplexing between users), and PUCCH format 4 (transmitting UCI of more than 2 bits while supporting multiplexing between users).

[0176] Type II PUCCH, also known as short PUCCH, can be transmitted using one or two symbols mapped to a time slot. It can be used to transmit small amounts of UCI or to allocate data 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 transmissions of 1 or 2 bits of UCI and PUCCH format 2 for transmissions of more than 2 bits of UCI.

[0177] In a time slot, there may be time-frequency resources available for Type 1 PUCCH and time-frequency resources available for Type 2 PUCCH. These can be allocated to different terminals or to a single terminal. When allocated to a single terminal, Type 1 and Type 2 PUCCH can be transmitted in different time resources (i.e., different OFDM symbols). In other words, when allocated to a single terminal, Type 1 and Type 2 PUCCH can be time-division multiplexed (TDM) for transmission.

[0178] The UCI mapped to the PUCCH can include Scheduling Grant (SR), HARQ-ACK, Rank Information (RI), CSI, and Beam-Related Information (BRI). 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 over the radio channel when using multiple antennas. CSI informs the terminal of values ​​related to the channel conditions between the base station and the terminal. BRI provides information about beamforming of the transmitter and receiver.

[0179] refer to Figure 13 (a) A DL-centered time slot can be configured and indicated by five DL symbols, one flexible symbol, and one UL symbol. A second type PUCCH with a symbol length of 1 can be assigned to a DL-centered time slot. The second type PUCCH can be located in the last symbol of the time slot.

[0180] refer to Figure 13 (b) The illustrated UL-symbol-centered time slot can be configured and indicated by one DL symbol, one flexible symbol, and five UL symbols. Type 1 PUCCHs and / or Type 2 PUCCHs can be assigned to the UL-symbol-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.

[0181] refer to Figure 13(c) allows the first type PUCCH and / or the second type PUCCH to be assigned to a time slot with only UL symbols (UL only). For example, the first type PUCCH can be mapped to six symbols and the second type PUCCH can be mapped to the last symbol of the time slot.

[0182] refer to Figure 12 and Figure 13 The second type of PUCCH transmission can be configured in time slots as DL symbol-centered, UL symbol-centered, and UL symbol-only time slots, while the first type of PUCCH transmission can be configured in time slots as UL symbol-centered and UL symbol-only time slots. Both the first and second types of PUCCH are TDM-enabled, and the transmittable time slots are UL symbol-centered and UL symbol-only time slots. For reference, in a DL symbol-centered time slot, one symbol is assigned to the uplink, therefore the second type of PUCCH is transmittable but the first type of PUCCH is not. Therefore, the PDCCH used for PUCCH scheduling can allocate the first type of PUCCH to a UL symbol-centered time slot or a UL symbol-only time slot. The PDCCH used for PUCCH scheduling can allocate the second type of PUCCH to a DL symbol-centered time slot, a UL symbol-centered time slot, or a UL symbol-only time slot.

[0183] As described above, the base station (or network) can change the time slot configuration according to the terminal's services and various conditions, and can notify the terminal of the corresponding time slot configuration change. Since the time slot configuration can be changed as described above, the terminal should receive information about the time slot configuration or time slot configuration information indicators by monitoring the group common PDCCH and UE-specific PDCCH. However, due to issues such as interference between the base station and the terminal and radio channel conditions, the terminal may fail to receive the group common PDCCH and UE-specific PDCCH.

[0184] If a terminal fails to receive the group common PDCCH and / or UE-specific PDCCH, it may be unable to determine 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, forcing the PUCCH transmission as scheduled may result in PUCCH transmission failure, which could cause problems such as temporary loss of communication or delays. Therefore, in this situation, a clear procedure or pre-established protocol between the terminal and the base station is necessary, whereby the procedure or protocol pertains to whether the terminal sends or discards the indicated PUCCH and how transmission is performed if the terminal sends a PUCCH.

[0185] The following describes the operating methods of the terminal and the base station, wherein the operating methods are designed to address situations in which the terminal fails to receive the group common PDCCH and / or UE-specific PDCCH, which include a timeslot configuration information indicator and timeslot configuration related information.

[0186] The present invention defines a terminal and its operation method, as well as a base station and its operation method. In this invention, even though the terminal has successfully received a UE-specific PDCCH and / or a group common PDCCH including a time slot configuration information indicator and time slot configuration related information, if the configuration of a time slot that has been allocated a PUCCH (or scheduled a PUCCH transmission) changes and therefore cannot transmit the allocated PUCCH, the terminal processes the transmission of the PUCCH, and the base station processes the reception of the allocated PUCCH.

[0187] [First Embodiment]

[0188] The first embodiment relates to a method for achieving predictable communication conditions between a terminal and a base station by imposing certain restrictions on changes in the base station's time slot configuration. In this case, the terminal's PUCCH transmission can be performed regardless of the success or failure of receiving the group common PDCCH and the UE-specific PDCCH.

[0189] (Method 1) — The time slot configuration, including the time slots in which the symbols for which PUCCH are allocated (or will be transmitted) remain unchanged. No change

[0190] Method 1 can be applied differently depending on the type of PUCCH allocated (or to be sent), i.e., whether the PUCCH is a type 1 PUCCH or a type 2 PUCCH.

[0191] i) The time slot configuration of the symbols in which the first type PUCCH is allocated (or will be transmitted) remains unchanged. That is, the base station does not change the time slot configuration of the OFDM symbols in which the first type PUCCH is allocated (or will be transmitted), and the terminal also assumes (or agrees to or expects) that the time slot configuration of the OFDM symbols in which the first type PUCCH is allocated (or will be transmitted) has not changed. Therefore, the terminal can transmit the first type PUCCH regardless of the time slot configuration information indicators and time slot configuration related information received in the group common PDCCH and UE-specific PDCCH.

[0192] ii) The time slot configuration of the symbols in which the second type PUCCH is allocated (or will be transmitted) remains unchanged. That is, the base station does not change the time slot configuration of the symbols in which the second type PUCCH is allocated (or will be transmitted), and the terminal also assumes (or agrees or expects) that the time slot configuration of the symbols in which the second type PUCCH is allocated (or will be transmitted) has not changed. Therefore, the terminal can transmit the second type PUCCH regardless of the time slot configuration information indicators and time slot configuration related information received in the group common PDCCH and UE-specific PDCCH.

[0193] Method 1 described above has some drawbacks in terms of scheduling flexibility. Therefore, a method that allows for changes in the time slot configuration of the base station within a certain range is described below.

[0194] (Method 2) — The time slots in which the symbols allocated (or to be sent) PUCCH can be changed only within a certain range. Configuration

[0195] Even if the time slot configuration in which the symbols for which PUCCH are allocated (or to be transmitted) change, the time slot configuration can be changed only to a time slot configuration where PUCCH transmission is possible, and may not be changed to a time slot configuration where PUCCH transmission is impossible. Therefore, for a time slot indicated by the base station as having PUCCH transmission, the terminal does not anticipate a change in the time slot where PUCCH transmission is impossible. Method 2 can be applied differently depending on the type of PUCCH allocated (or to be transmitted), i.e., whether the PUCCH is Type 1 or Type 2.

[0196] i) When the base station changes the time slot configuration of a symbol allocated with Type 1 PUCCH, the time slot configuration can be changed to a time slot configuration where Type 1 PUCCH transmission is possible only, and may not be changed to a time slot configuration where Type 1 PUCCH transmission is impossible. Therefore, for a time slot indicated by the base station as having Type 1 PUCCH transmission, the terminal does not anticipate a change in the time slot in which Type 1 PUCCH cannot be transmitted. Even if the terminal fails to receive a group common PDCCH including a time slot configuration information indicator for transmitting Type 1 PUCCH, the terminal can always transmit Type 1 PUCCH in the assigned resource.

[0197] For example, a base station can change a UL-symbol-centered time slot of a Type 1 PUCCH allocated with four OFDM symbol lengths to a time slot including only UL symbols, but cannot change it to a time slot including only DL symbols or a time slot centered with only DL symbols and having only one UL symbol. On the other hand, a terminal can expect that a UL-symbol-centered time slot of a Type 1 PUCCH allocated with four OFDM symbol lengths as indicated by the base station for transmission can be changed to a time slot including only UL symbols, but does not expect a change to a time slot including only DL symbols or a time slot centered with DL symbols. The terminal does not expect a change in the time slot configuration where the UL symbols of the Type 1 PUCCH to be transmitted, as indicated by the base station, are changed to DL symbols.

[0198] ii) When a base station changes the time slot configuration of a symbol allocated with a Type 2 PUCCH, the time slot configuration can be changed to a time slot configuration where Type 2 PUCCH transmission is possible, or it may not be changed to a time slot configuration where Type 2 PUCCH transmission is impossible. Therefore, for a time slot indicated by the base station as having Type 2 PUCCH transmission, the terminal does not anticipate a change to a time slot where Type 2 PUCCH transmission is impossible. Even if the terminal fails to receive a group common PDCCH including a time slot configuration information indicator for the time slot where Type 2 PUCCH transmission is possible, the terminal can always transmit Type 2 PUCCH in the assigned resources. More specifically, the base station can change a UL symbol-centered time slot allocated with Type 2 PUCCH to a DL symbol-centered time slot where Type 2 PUCCH transmission is possible, or a time slot including only UL symbols, but cannot change it to a time slot including only DL symbols where Type 2 PUCCH transmission is impossible. For a time slot indicated as having Type 2 PUCCH transmission, the terminal does not anticipate a change by the base station to a time slot where Type 2 PUCCH transmission is impossible.

[0199] For example, a terminal may anticipate (or predict) that a UL-symbol-centered time slot for a Type 2 PUCCH of one or two symbol lengths, already assigned by the base station for transmission, can be changed to a DL-symbol-centered time slot that may include the Type 2 PUCCH, or a time slot that includes only UL symbols. However, it does not anticipate (or predict) that a UL-symbol-centered time slot will be changed to a time slot that includes only DL symbols, which cannot include the Type 2 PUCCH. The terminal does not anticipate any change in the time slot configuration where the UL symbols for transmitting the Type 2 PUCCH, as indicated by the base station, are changed to DL symbols.

[0200] In the following text, a method for further improving scheduling flexibility is described in comparison with the aforementioned method 2, which allows for changes in the time slot configuration of base stations within a certain range.

[0201] (Method 3) — The time slot configuration of the symbols in which PUCCH is allocated (or will be sent) can be freely changed.

[0202] The base station can freely change the configuration of the time slots allocated to PUCCH.

[0203] If the PUCCH is a Type 1 PUCCH, and the terminal fails to receive a Group Common PDCCH that includes a timeslot configuration information indicator for the timeslot used for the transmission of the Type 1 PUCCH, the terminal may not transmit the Type 1 PUCCH in the assigned resources.

[0204] If the PUCCH is a Type 2 PUCCH, and the terminal fails to receive a Group Common PDCCH that includes a timeslot configuration information indicator for the timeslot used for the transmission of the Type 2 PUCCH, the terminal may not transmit the Type 2 PUCCH in the assigned resources.

[0205] When the aforementioned method is applied, even if the terminal fails to receive the group common PDCCH and / or UE-specific PDCCH from the base station, communication errors or delays can be resolved because the transmission or non-transmission of the scheduled PDCCH and the determination of the transmission process are clearly defined.

[0206] [Second Embodiment]

[0207] The second embodiment relates to the operation process of the terminal and the base station when the time slot configuration of the base station can be freely changed and the terminal successfully receives at least one of the UE-specific PDCCH and the group common PDCCH, which includes a time slot configuration information indicator and time slot configuration related information.

[0208] More specifically, this disclosure relates to a terminal and its operating method, and a base station and its operating method, wherein when the configuration of a time slot in which a PUCCH is allocated (or scheduled for PUCCH transmission) changes and the changed time slot configuration contradicts the PUCCH (i.e., when a symbol in a time slot in which a PUCCH is allocated overlaps with a DL symbol due to the changed time slot configuration), the terminal processes the transmission of the PUCCH, and the base station processes the reception of the PUCCH.

[0209] In a changed timeslot configuration, the transmission of the allocated PUCCH may or may not be possible (or valid and appropriate) (if the timeslot configuration is contradictory). See here for reference. Figure 13The time slots in which PUCCH transmission is possible may include UL symbol-centered time slots or time slots containing only UL symbols that have been allocated a first type of PUCCH, and DL symbol-centered time slots, UL symbol-centered time slots, or UL symbol-only time slots that have been allocated a second type of PUCCH. Time slots in which PUCCH cannot be transmitted may include, for example, a time slot allocated a first type of PUCCH that is changed to a DL symbol-centered time slot or a time slot containing only DL symbols, or a time slot allocated a second type of PUCCH that is changed to a time slot containing only DL symbols, etc.

[0210] When the configuration of a time slot designated for PUCCH transmission changes, the terminal can perform PUCCH transmission by using the changed time slot if PUCCH transmission is possible (or valid and suitable) in the changed time slot configuration. However, in order to send PUCCH even when the configuration of the designated time slot changes and therefore conflicts with PUCCH transmission, a special protocol between the terminal and the base station is required.

[0211] In the following section of this specification, a method for processing PUCCH under conflicting time slot configurations will be described. Since uplink control information (UCI) can be sent to the base station via PUCCH, the PUCCH described herein can be used interchangeably with UCI. For example, the method for processing PUCCH in conflicting time slot configurations corresponds to the method for processing UCI (HARQ-ACK, RI, etc.) in conflicting time slot configurations.

[0212] (Method 1) — A method for processing PUCCH in the indicated time slot

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

[0214] In the description of the PUCCH processing method, a terminal may receive a group common PDCCH including a timeslot configuration information indicator that indicates a timeslot for transmission of a first type of PUCCH, and the terminal may perform transmission of either a first type of PUCCH or a second type of PUCCH in the indicated timeslot. To enable the terminal to transmit either a first type of PUCCH or a second type of PUCCH in the indicated timeslot, the following conditions may be considered.

[0215] As an example, a terminal may transmit a first-type PUCCH in an indicated time slot based on a comparison between the UL symbol configured according to the time slot to be indicated for the transmission of the first-type PUCCH and the UL symbol assigned to the transmission of the first-type PUCCH. If the UL symbol configured according to the time slot in the time slot indicated for the transmission of the first-type PUCCH is greater than (or greater than or equal to) the UL symbol required for the transmission of the first-type PUCCH, the terminal transmits the first-type PUCCH in the assigned resources of the time slot.

[0216] As another example, a terminal can transmit a first-type PUCCH, discard, or suspend the transmission based on a comparison between the number of UL symbols configured according to the time slot in which the transmission of the first-type PUCCH is indicated and the number of UL symbols required for the transmission of the first-type PUCCH. Specifically, if the number of UL symbols configured according to the time slot in which the transmission of the first-type PUCCH is indicated is less than the number of 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 the transmission of the PUCCH corresponds to multiple time slots, the terminal can delay the transmission of the first-type PUCCH to a second time slot that provides the UL symbols required for the transmission of the first-type PUCCH, instead of scheduling the first time slot, and thus transmit the first-type PUCCH on the second time slot. On the other hand, if the time slot indicated for the transmission of 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 number of UL symbols configured according to the time slot in the time slot indicated for transmission of the first-type PUCCH, the number of flexible symbols, and the number of UL symbols assigned to the transmission of the first-type PUCCH. Specifically, if the sum of the number of UL symbols configured according to the time slot and the number of flexible symbols in the time slot indicated for transmission of 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 in the assigned resources within the time slot.

[0218] As another example, a terminal can transmit a first-type PUCCH, discard, or suspend the transmission based on a comparison of the number of UL symbols configured according to the time slot, the number of flexible symbols, and the number of UL symbols assigned to transmit the first-type PUCCH in the time slot indicated for the transmission of the first-type PUCCH. Specifically, if the sum of the number of UL symbols configured according to the time slot and the number of flexible symbols in the time slot indicated for the transmission of the first-type PUCCH is less than the number of 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. If the time slot indicated for the transmission of the PUCCH corresponds to multiple time slots, the terminal can transmit the first-type PUCCH in the time slot that satisfies the number of UL symbols assigned to the transmission of the first-type PUCCH. On the other hand, if the time slot indicated for the transmission of the PUCCH is a single time slot, the terminal can discard or suspend the scheduled first-type PUCCH transmission.

[0219] In another example of the method for processing PUCCH, the terminal may receive a group public PDCCH and a UE-specific PDCCH indicating the time slot configuration indicated for the transmission of a first type PUCCH, and may transmit either a first type PUCCH or a second type PUCCH based on conditions to be described later. In this case, the terminal may determine whether to transmit the first type PUCCH in the indicated time slot based on conditions according to the following example.

[0220] Figure 14 This is a diagram illustrating a method for transmitting PUCCH in a time slot according to an embodiment of the present disclosure.

[0221] As an example, i) the base station can change the configuration of the time slot allocated to the first type PUCCH, ii) when the terminal successfully receives the group public PDCCH and UE-specific PDCCH indicating the configuration of the time slot allocated to the first type PUCCH, iii) if the time slot configuration corresponds to a time slot in which the first type PUCCH can be transmitted, the terminal can transmit the first type PUCCH in the resources allocated to that time slot.

[0222] As another example, i) the base station can change the configuration of the time slots allocated for the first type PUCCH, and ii) the terminal can successfully receive the group common PDCCH and UE-specific PDCCH indicating the configuration of the time slots allocated for the first type PUCCH. However, iii) if the time slot configuration corresponds to a time slot in which the first type PUCCH cannot be transmitted, the terminal may not perform the transmission of the first type PUCCH in that time slot, but may transmit the first type PUCCH corresponding to the changed time slot configuration, or may transmit in the time slot (see reference). Figure 14 The second type of PUCCH is used instead of the first type of PUCCH. The specific PUCCH transmission operations of the terminal are summarized as follows.

[0223] a. The terminal does not perform the assigned Type 1 PUCCH transmission.

[0224] b-1. In the case of a time slot configuration (or format) with a length (e.g., 4 to 12 symbols) of a first type PUCCH that can be configured, if the number of UL symbols of the first type PUCCH that can be configured in the corresponding time slot is less than the pre-configured number of first type PUCCH symbols to be transmitted, the terminal transmits the first type PUCCH according to the UL symbols that can be transmitted in the changed time slot configuration (or format) or transmits the first type PUCCH with UL symbols that correspond to at least 4 symbols in length, even if the number is less than the number of UL symbols.

[0225] b-2. UCI transmission intended for use by the terminal can be configured such that the terminal sends a first type of PUCCH corresponding to a fixed symbol length (i.e., 4 symbol length), regardless of the UL symbols that can be sent in the corresponding time slot.

[0226] c. Although the time slot configuration does not allow for the transmission of Type 1 PUCCH, if the time slot allows for the transmission of Type 2 PUCCH, the terminal may transmit Type 2 PUCCH within the time slot instead of the allocated Type 1 PUCCH. The amount of UCI that can be transmitted via Type 2 PUCCH within the time slot may be limited. In this case, the terminal may transmit UCI based on at least one of the following methods.

[0227] c-1. The terminal can transmit certain information based on the importance of the UCI to be transmitted via the first type of PUCCH. For example, the importance or priority of information 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) (i.e., HARQ-ACK > RI > CSI > BRI). As another example, the importance or priority of information 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 (i.e., HARQ-ACK > BRI > RI > CSI). As another example, the importance or priority of information 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 (i.e., BRI > HARQ-ACK > RI > CSI).

[0228] c-2. The terminal can send some information of high importance via the second type PUCCH based on the amount of UCI that can be sent via the second type PUCCH.

[0229] c-3. When the information to be transmitted in the first type of PUCCH includes information about the primary cell (PCell) and secondary cell (SCell), the terminal may transmit some information based on the importance or priority between the PCell and SCell. For example, the terminal may transmit information related only to the PCell 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 PCell or the primary / secondary cell (PSCell), the terminal may transmit information related only to the PCell or PSCell via the second type of PUCCH.

[0230] c-4. The terminal can preferentially transmit UCIs for the DL associated with the cell that the PUCCH can transmit (e.g., the DL cell linked to the SIB) on each PUCCH group via the second type of PUCCH.

[0231] c-5. The terminal can transmit the second type PUCCH based on the importance between the SCell and PCell, and the importance of the UCI. For example, the terminal can transmit the UCI type with high priority among the PCell-related UCIs (HARQ-ACK, BRI, RI, CSI, etc.) via the second type PUCCH. In c-5, it is not the type of UCI to be transmitted via the second type PUCCH, but rather the serving cell to which the UCI is related that priority is given. Of course, the type of UCI to be transmitted via the second type PUCCH can be prioritized over the serving cell to which the UCI is related. The priority between the serving cell and the UCI can be sent to the terminal by the base station while being included in configuration information such as RRC signaling, or it can be defined separately according to the payload size of the second type PUCCH.

[0232] c-6. The terminal can transmit only up to a specific number of bits of UCI via Type 2 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 Type 2 PUCCH, where X can be from 2 to several tens of bits.

[0233] c-7. The terminal can be configured to send HARQ-ACK or BRI up to X bits via a second type of PUCCH based on a specific type of UCI (i.e., HARQ-ACK or BRI), where X can be 2 to tens of bits.

[0234] As another example, the following situations may exist: i) the base station can change the configuration of the time slot allocated for the first type of PUCCH, and ii) the terminal successfully receives a group common PDCCH and a UE-specific PDCCH indicating the configuration of the time slot allocated for the first type of PUCCH. In this case, iii) the time slot configuration corresponds to the time slot in which the first type of PUCCH can be transmitted, iv) the PUSCH is allocated to the time slot (or the PUSCH transmission is scheduled) and configured for concurrent transmission of PUCCH and PUSCH, and v) if intermodulation distortion (IMD) may occur due to frequency separation between PUCCH and PUSCH, and it is therefore configured not to transmit the first type of PUCCH, then the terminal performs at least one of the specific operations (a to c-7).

[0235] Next, we will describe the case where the assigned PUCCH is a type 2 PUCCH. Figure 3 The UCIs (HARQ-ACK, RI, CSI, etc.) described in the document are mapped to the second type of PUCCH.

[0236] In the description of the PUCCH processing method, a terminal may receive a group common PDCCH including a timeslot configuration information indicator that indicates a timeslot for transmission of a second type of PUCCH, and the terminal may perform the transmission of the second type of PUCCH in the indicated timeslot. In this case, the conditions for whether the terminal will perform the transmission of the second type of PUCCH in the indicated timeslot can be considered as described below.

[0237] For example, a terminal may transmit a second-type PUCCH based on a comparison between the number of UL symbols configured according to the time slot in which the transmission of the second-type PUCCH is indicated and the number of UL symbols assigned to the transmission of the second-type PUCCH. Specifically, if the number of UL symbols configured according to the time slot in which the transmission of the second-type PUCCH is indicated 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 in the resources assigned in the time slot.

[0238] As another example, a terminal can transmit a second-type PUCCH, discard, or suspend the transmission based on a comparison between the number of UL symbols configured according to the time slot in which the transmission is indicated for the second-type PUCCH and the number of UL symbols required for the transmission. Specifically, if the number of UL symbols configured according to the time slot in which the transmission is indicated for the second-type PUCCH is less than the number of UL symbols required for the transmission, the terminal can discard the second-type PUCCH transmission in the indicated time slot. For example, if the time slot indicated for the PUCCH transmission corresponds to multiple time slots, the terminal can transmit the second-type PUCCH in the second time slot that satisfies the number of UL symbols required for the transmission. On the other hand, if the time slot indicated for the PUCCH transmission is a single time slot, the terminal can discard or suspend the scheduled second-type PUCCH transmission.

[0239] As another example, a terminal may transmit a second-type PUCCH based on a comparison of the number of UL symbols configured according to the time slot in the time slot indicated for transmission of the second-type PUCCH, the number of flexible symbols, and the number of UL symbols assigned to the transmission of the second-type PUCCH. Specifically, if the sum of the number of UL symbols configured according to the time slot in the time slot indicated for transmission of the second-type PUCCH and the number of symbols including flexible symbols 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 in the allocated resources of the time slot.

[0240] As another example, a terminal can transmit a second-type PUCCH, discard, or suspend the transmission based on a comparison of the number of UL symbols configured according to the time slot, the number of flexible symbols, and the number of UL symbols required for the transmission of the second-type PUCCH in the time slot indicated for the transmission of the second-type PUCCH. Specifically, if the sum of the number of UL symbols configured according to the time slot and the number of flexible symbols in the time slot indicated for the transmission of the second-type PUCCH is less than the number of UL symbols required for the transmission of the second-type PUCCH, the terminal can discard the transmission of the second-type PUCCH in the indicated time slot. For example, if the time slot indicated for the transmission of the PUCCH corresponds to multiple time slots, 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 the time slot indicated for the transmission of the PUCCH is a single time slot, the terminal can discard or suspend the scheduled second-type PUCCH transmission.

[0241] (Method 2) — A method for processing PUCCH in a time slot different from the indicated time slot.

[0242] In the description of the PUCCH processing method according to Method 2, if the configuration of the time slot indicated for PUCCH transmission changes, the terminal may perform PUCCH transmission in another time slot after the indicated time slot. That is, if the UL symbol carrying the PUCCH in the allocated PUCCH time slot overlaps with the DL symbol in the time slot due to the changed time slot configuration, the terminal may postpone or delay the PUCCH transmission to another time slot where PUCCH transmission is possible, rather than the indicated time slot.

[0243] In another delayed time slot, a PUCCH of the same type as the allocated specific type can be sent, or a PUCCH of a different type can be sent. In another delayed time slot, the resources used for sending a PUCCH of the same type as the allocated specific type can be different from the resources in the time domain used for the transmission of a pre-allocated PUCCH of that specific type.

[0244] This specification will first describe the PUCCH handling method under conflicting time slot configurations when the assigned PUCCH is a Type 1 PUCCH. Type 1 PUCCHs may include... Figure 3 The UCIs described herein, particularly HARQ-ACK, RI, CSI, etc., are used. Since the information mapped to the first type of PUCCH is UCI, the PUCCHs described in this specification can be used interchangeably with UCIs.

[0245] Figure 15 is a diagram illustrating an example of a configuration for sending PUCCH in another time slot based on a change in time slot configuration.

[0246] Referring to Figure 15(a), the terminal can identify, via receiving the group common PDCCH and / or UE-specific PDCCH indicating a change in the time slot configuration, that the UL-symbol-centered time slot N, in which the first type PUCCH (long PUCCH) was allocated, has been changed by the base station to a DL-symbol-centered time 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 time slot N+K instead of in time slot N. That is, in the delayed time slot N+K, the first type PUCCH of the same type as the allocated first type PUCCH is transmitted. Here, time slot N+K is the most recent time slot in which the allocated first type PUCCH can be transmitted, and it can be a UL-symbol-centered time slot.

[0247] In other words, even if the base station changes the configuration of the time slot allocated for the first type PUCCH and the terminal successfully receives the group public PDCCH and UE-specific PDCCH including time slot configuration information, if the time slot configuration corresponds to a time slot in which the first type PUCCH cannot be sent, the terminal may not send the first type PUCCH in that time slot, and may send the first type PUCCH in the most recent time slot in a subsequent time slot where the first type PUCCH can be sent.

[0248] Referring to Figure 15(b), the terminal can identify, via receiving the group common PDCCH and / or UE-specific PDCCH indicating a change in time slot configuration, that the UL symbol-centered time slot N, where a first type PUCCH (long PUCCH) was allocated, has been changed by the base station to a time slot configuration in which the first type PUCCH cannot be transmitted. In this case, the terminal can transmit a second type PUCCH (short PUCCH) in time slot N+K instead of transmitting the first type PUCCH in time slot N. In the delayed time slot N+K, a second type PUCCH with a type different from the allocated first type PUCCH is transmitted. That is, in the delayed time slot N+K, a second type PUCCH with a type changed from the allocated first type PUCCH is transmitted. Here, time slot N+K is the most recent time slot where the second type PUCCH can be transmitted, and it can be a time slot centered on the DL symbol.

[0249] In other words, even if the base station changes the configuration of the time slot allocated for the first type PUCCH and the terminal successfully receives the group public PDCCH and UE-specific PDCCH including time slot configuration information, if the time slot configuration corresponds to a time slot in which the first type PUCCH cannot be sent, the terminal may not send the first type PUCCH in that time slot, and may send the second type PUCCH in the nearest time slot in a subsequent time slot where the second type PUCCH can be sent.

[0250] Here, the UCI sent via the second type of PUCCH may include only a portion of the UCI originally scheduled for transmission, depending on its importance, and may not include the remainder.

[0251] The terminal can send certain information based on the importance of the UCI to be transmitted via the first type of PUCCH. For example, the importance or priority of information 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) (i.e., HARQ-ACK > RI > CSI > BRI). As another example, the importance or priority of information 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 (i.e., HARQ-ACK > BRI > RI > CSI). As yet another example, the importance or priority of information 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 (i.e., BRI > HARQ-ACK > RI > CSI).

[0252] The terminal can send some highly important information via the second type PUCCH based on the amount of UCI that can be sent via the second type PUCCH.

[0253] When the information to be transmitted in the first type of PUCCH includes information about the primary cell (PCell) and secondary cell (SCell), the terminal can transmit some information based on the importance or priority between the PCell and SCell. For example, the terminal can transmit information related only to the PCell through the second type of PUCCH. As another example, when the information to be transmitted in the first type of PUCCH includes information about the PCell or the primary / secondary cell (PSCell), the terminal can transmit information related only to the PCell or PSCell through the second type of PUCCH.

[0254] Terminals can preferentially transmit UCIs for DLs associated with cells that can be transmitted via PUCCH (e.g., SIB-linked DL cells) on each PUCCH group via Type II PUCCH.

[0255] The terminal can transmit the second type of PUCCH based on the importance between the SCell and PCell and the importance of the UCI. For example, the terminal can transmit UCI types with high priority among those related to the primary cell (HARQ-ACK, beam-related information, RI, CSI, etc.) via the second type of PUCCH. In c-5, it is not the type of UCI to be transmitted via the second type of PUCCH, but rather the serving cell to which the UCI is related that priority is given. Of course, the type of UCI to be transmitted via the second type of PUCCH can be prioritized over the serving cell to which the UCI is related. The priority between the serving cell and the UCI can be sent to the terminal by the base station while being included in configuration information such as RRC signaling, or it can be defined separately according to the payload size of the second type of PUCCH.

[0256] The terminal can transmit up to a specific number of bits of UCI via Type 2 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 Type 2 PUCCH, where X can be from 2 to several tens of bits.

[0257] The terminal can be configured to send HARQ-ACK or BRI up to X bits via a second type of PUCCH based on a specific type of UCI (i.e., HARQ-ACK or BRI), where X can be 2 to tens of bits.

[0258] (Method 3) — A method for handling HARQ-ACK in a time slot different from the indicated time slot.

[0259] In the description of the HARQ-ACK processing method, the base station can change the configuration of the allocated PUCCH in time slot N, and the terminal can receive a group common PDCCH and / or a UE-specific PDCCH including information about the changed time slot configuration. If the allocated PUCCH cannot be transmitted under the changed time slot configuration (i.e., if the changed time slot configuration contradicts the allocated PUCCH), the terminal can send the allocated PUCCH with the HARQ-ACK information delayed by K time slots from time slot N (i.e., N+K). The "allocated PUCCH" can be a first-type PUCCH or a second-type PUCCH. The value K can be determined based on the time taken by the base station to schedule the PUCCH feedback from the PDSCH. After time slot N+K, a PUCCH for HARQ-ACK feedback from another terminal may not be allocated in the time slot where the PUCCH can be transmitted. For example, when a terminal and a base station communicate with each other based on Frequency Division Duplex (FDD), the PUCCH for HARQ-ACK of other terminals may not be sent (or allocated) in the transmission time slot after 4ms (common for 3GPP LTE, LTE-A, and NR). The value K can be provided via the RRC signal.

[0260] In another HARQ-ACK processing method, the base station can change the configuration of the time slot N allocated with the first type of PUCCH, and the terminal can receive a group common PDCCH and / or a UE-specific PDCCH including information about the changed time slot configuration. If the first type of PUCCH cannot be sent based on the changed time slot configuration, but the second type of PUCCH can be sent, the terminal can wait for or request the base station to reallocate the PUCCH without sending the first type of PUCCH. For example, the base station can retransmit the PDSCH to a terminal that has not yet sent a first type of PUCCH including a HARQ-ACK, and can assign resources for retransmitting the first type of PUCCH in the PDCCH used for PDSCH scheduling.

[0261] In another HARQ-ACK processing method, the base station can change the configuration of slot N for which a PUCCH is allocated. If the terminal fails to receive a group common PDCCH for the transmission of configuration information for slot N but has received a UE-specific PDCCH for scheduling PDSCH (or PUSCH) and thus knows the slot configuration of slot N, the terminal can selectively transmit the PUCCH based on the slot configuration. For example, if the slot configuration is one in which the allocated PUCCH can be transmitted, the terminal can transmit the PUCCH. As another example, if the 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.

[0262] [Third Embodiment]

[0263] The third embodiment relates to information regarding time slot configuration sent from a base station to a terminal, and a method for operating the terminal and the base station based on this information. The base station can notify the terminal of the time slot configuration information using various information and procedures.

[0264] (Method 1) — Information about time slot configuration

[0265] Information regarding time slot configuration includes semi-static DL / UL assignment information. For example, a base station can send a default time slot format or semi-static DL / UL assignment information (or semi-static time slot format information (SFI)) to the terminal in a cell-specific manner, and can 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 the default time slot format), the terminal can know the time slot configuration for subsequent time slots. Specifically, the semi-static DL / UL assignment information (or the default time slot format) indicates whether each symbol in the time slot is a DL symbol, a UL symbol, or a flexible symbol other than DL and UL symbols. Here, the terminal can assume, via the semi-static DL / UL assignment information (or the default time slot format), that a symbol indicated as neither a DL symbol nor a UL symbol is indicated as "flexible."

[0266] Information regarding slot configuration includes Dynamic Slot Format Information (SFI), which is included in the group common PDCCH for transmission. SFI indicates whether each symbol in the slot is a DL symbol, UL symbol, or a flexible symbol other than DL and UL symbols. Flexible symbols can replace slots and can be used for different purposes besides slots. The group common PDCCH in which SFI is transmitted can be scrambled with SFI-RNTI. Whether a terminal monitors SFI can be configured or indicated by an RRC message. Terminals not indicated by an RRC message for monitoring may not monitor SFI.

[0267] Information regarding time slot configuration can be scheduling information included in the downlink control information (DCI) mapped to a UE-specific PDCCH. For example, if information about the start position and length of the PDSCH is included in the DCI, the symbol in which the PDSCH is scheduled can be assumed to be a DL symbol. If information about the start position and length of the PUSCH is included in the DCI, the symbol in which the PUSCH is scheduled can be assumed to be a UL symbol. If information about the start position and length of the PUCCH used for HARQ-ACK transmission is included in the DCI, the symbol in which the PUCCH is scheduled can be assumed to be a UL symbol.

[0268] (Method 2) — Methods for determining the sign direction and processing PUCCH

[0269] Because various information regarding time slot configurations exist as described above, the terminal can receive information about different types of time slot configurations for the same time slot. Furthermore, the base station can allow information about each time slot configuration to indicate different symbol directions within the same time slot. In this case, the change or determination of symbol direction by the terminal and the base station can follow the rules below.

[0270] The orientation of the DL and UL symbols in the semi-static DL / UL assignment information (or default time slot format) is not changed by 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 regardless of the dynamic time slot configuration information or scheduling information. If at least one of the symbols for which the PUCCH is assigned overlaps with a DL symbol in the default time slot format, the terminal may not send the corresponding PUCCH, or it may change the length of the PUCCH according to the length of the remaining symbols other than the corresponding DL symbol in order to send the PUCCH. Here, the assigned PUCCH can be a first-type PUCCH or a second-type PUCCH.

[0271] The direction of flexible symbols configured by semi-static DL / UL assignment information (or default time slot format) can be determined or changed by dynamic time slot configuration information or scheduling information. If at least one of the symbols assigned to a PUCCH overlaps with a flexible symbol in the semi-static DL / UL assignment information (or default time slot format), the terminal can determine whether to send a PUCCH based on the type (HARQ-ACK, RI, SR, CSI, etc.) of the information transmitted via the PUCCH (i.e., UCI). The PUCCH can be a first-type PUCCH or a second-type PUCCH. For example, if the information transmitted via the PUCCH includes a HARQ-ACK for the PDSCH, the terminal sends the PUCCH at the determined location, regardless of the dynamic time slot configuration information indicated by the group common PDCCH. Here, the determined location is indicated in the DCI used for scheduling the PDSCH. If the information transmitted via the PUCCH does not include a 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 time slot configuration information.

[0272] If at least one of the symbols assigned to a PUCCH is indicated by dynamic timeslot configuration information as a different symbol from a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit a PUCCH. Alternatively, if the terminal fails to receive dynamic timeslot configuration information for the symbol assigned to the PUCCH, the terminal does not transmit a PUCCH.

[0273] If at least one of the symbols assigned to a PUCCH overlaps with a flexible symbol configured via semi-static DL / UL assignment, the terminal can determine whether to send a PUCCH based on the signaling that triggered the PUCCH transmission. For example, if the PUCCH is triggered via DCI, the terminal sends the PUCCH at a determined location regardless of the dynamic timeslot configuration information. Here, the determined location is indicated in the DCI. If the PUCCH is triggered via a UE-specific RRC message, the terminal sends the PUCCH when the symbol assigned to the PUCCH is indicated as a UL symbol via the dynamic timeslot configuration information.

[0274] If at least one of the symbols assigned to a PUCCH is indicated by dynamic timeslot configuration information as a different symbol from a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit a PUCCH. Alternatively, if the terminal fails to receive dynamic timeslot configuration information for the symbol assigned to the PUCCH, the terminal does not transmit a PUCCH.

[0275] (Method 3) — A method for handling duplicate PUCCHs

[0276] A terminal may repeatedly transmit PUCCH over several time slots. In this specification, this PUCCH is described as a repeated PUCCH. A repeated PUCCH can be either a Type 1 PUCCH or a Type 2 PUCCH. The base station may configure the number of time slots in which the repeated PUCCH is transmitted to the terminal via an RRC message. Within each time slot, the start and end symbols of the PUCCH may be the same for each repeated time slot. Depending on whether the DL symbol, UL symbol, and flexible symbol are configured via RRCs such as semi-static DL / UL assignment information (or default time slot mode) and dynamic time slot configuration information, the terminal may or may not transmit repeated PUCCHs. The method for handling repeated PUCCHs in each case will be described below.

[0277] (Method 3-1) — When the repeated PUCCH and UL symbol overlap

[0278] If a UL symbol configured with semi-static DL / UL assignment information (or a default time slot pattern) is located in each time slot indicated for repeated PUCCH transmission, the terminal can transmit PUCCH in the time slot where the UL symbol is located, regardless of the reception of dynamic time slot configuration information or scheduling information. Here, the directions of the DL and UL symbols configured according to the time slots configured via RRC messages such as semi-static DL / UL assignment information (or a default time slot pattern) are not changed by dynamic time slot configuration information or scheduling information.

[0279] (Method 3-2) — When the repeated PUCCH and DL symbols overlap

[0280] If at least one of the symbols assigned to the repeated PUCCH in each of the time slots indicated for the transmission of the repeated PUCCH overlaps with a DL symbol according to the semi-static DL / UL assignment information, the terminal does not transmit the PUCCH in the time slot including the overlapping DL symbol, or transmits the PUCCH by changing its length according to the length of the remaining symbols other than the overlapping DL symbol. Alternatively, if at least one of the symbols assigned to the repeated PUCCH in one of the time slots indicated for the transmission of the repeated PUCCH overlaps with a DL symbol configured with semi-static DL / UL assignment information (or the default time slot pattern), the terminal does not transmit the repeated PUCCH in subsequent time slots or in time slots including the overlapping DL symbol.

[0281] (Method 3-3) — When repeating PUCCH overlaps with flexible notation

[0282] In each time slot designated for the transmission of a repeated PUCCH, at least one of the symbols allocated for the repeated PUCCH can overlap with flexible symbols configured via semi-static DL / UL assignment. In this case, i) the terminal can determine whether to transmit the repeated PUCCH based on the type of information (i.e., UCI) sent via the repeated PUCCH (HARQ-ACK, RI, CSI, etc.). ii) the terminal can determine whether to transmit the repeated PUCCH based on the signaling that triggers the PUCCH transmission. iii) the terminal can determine whether to transmit the repeated PUCCH based on dynamic time slot configuration information. The repeated PUCCH can be either a first-type PUCCH or a second-type PUCCH.

[0283] The terminal can determine whether to send a duplicate PUCCH based on the type (HARQ-ACK, RI, CSI, etc.) of the information (i.e., UCI) sent via the duplicate PUCCH. For example, if the information sent via the duplicate PUCCH includes a HARQ-ACK for a PDSCH scheduled via PDCCH, the terminal sends the duplicate PUCCH at the determined location, regardless of the dynamic slot configuration information indicated via the group common PDCCH. Here, the determined location is indicated in the DCI used for PDSCH scheduling. If the information sent via the duplicate PUCCH does not include a HARQ-ACK for the PDSCH or includes a HARQ-ACK for a PDSCH configured via RRC, the terminal sends the duplicate PUCCH when the flexible symbol overlapping with the duplicate PUCCH is indicated as a UL symbol via the dynamic slot configuration information. As another example, if at least one of the symbols assigned to a repeated PUCCH in each of the time slots designated for the transmission of a repeated PUCCH is indicated by dynamic time slot configuration information as a symbol different from a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit a repeated PUCCH in that time slot. Alternatively, if the terminal fails to receive dynamic time slot configuration information for the symbol assigned to the repeated PUCCH, the terminal does not transmit a repeated PUCCH in that time slot. Even if a repeated PUCCH is not transmitted in the corresponding time slot, the terminal also transmits a repeated PUCCH in a subsequent time slot if a specific condition is met in a subsequent time slot (when a flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by dynamic time slot configuration information).

[0284] If a terminal fails to transmit a duplicate PUCCH in any of the time slots instructed to do so, the terminal will not perform duplicate PUCCH transmissions even in subsequent time slots. Examples of failure to transmit a duplicate PUCCH may include sign direction discrepancies caused by dynamic time slot configuration information, or the terminal failing to receive dynamic time slot configuration information.

[0285] If at least one of the symbols assigned to a repeated PUCCH overlaps with a flexible symbol configured via semi-static DL / UL assignment, the terminal can determine whether to send a repeated PUCCH based on the signaling that triggered the transmission of the repeated PUCCH. For example, if the repeated PUCCH is triggered via DCI, the terminal sends the repeated PUCCH at a determined location, regardless of the dynamic timeslot configuration information. Here, the determined location is indicated in the DCI. If the repeated PUCCH is triggered via a UE-specific RRC message, the terminal sends the repeated PUCCH when the symbol assigned to the repeated PUCCH is indicated as a UL symbol via the dynamic timeslot configuration information.

[0286] In each time slot designated for the transmission of a repeated PUCCH, if at least one of the symbols assigned to the repeated PUCCH is indicated as a different symbol from the UL symbol (e.g., a DL symbol or a flexible symbol) via dynamic time slot configuration information, the terminal does not transmit the repeated PUCCH in that time slot. Alternatively, if the terminal fails to receive dynamic time slot configuration information for the symbol assigned to the repeated PUCCH, 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 may transmit the repeated PUCCH in a subsequent time slot if certain conditions are met in a subsequent time slot. Examples of such conditions may include indicating a flexible symbol overlapping with the repeated PUCCH as a UL symbol via dynamic time slot configuration information.

[0287] If a terminal does not transmit a repeated PUCCH in a time slot designated for a repeated PUCCH transmission for some reason (symbol direction inconsistency caused by dynamic time slot configuration information or failure of the terminal to receive dynamic time slot configuration information), the terminal will not perform repeated PUCCH transmission even in subsequent time slots.

[0288] Here, the number K of slots in which PUCCH transmissions are repeated (or attempted) can be configured / defined as follows.

[0289] i) The K time slots configured for the transmission of repeated PUCCHs are not necessarily consecutive. For example, if the terminal is configured to repeatedly transmit PUCCHs over K time slots, the PUCCHs can be transmitted repeatedly until the count of the number of time slots actually transmitted, excluding the time slots in which repeated PUCCHs are not transmitted, reaches K.

[0290] ii) The K time slots configured for the transmission of repeated PUCCHs should be consecutive. For example, if a terminal is configured to repeatedly transmit PUCCHs over K time slots, it can repeatedly transmit PUCCHs starting from time slot N, which is indicated for the transmission of repeated PUCCHs, until the count of the number of time slots in which PUCCHs have been attempted to be transmitted (including time slots in which repeated PUCCHs were not transmitted) reaches K. That is, a terminal that has first attempted to transmit a PUCCH in time slot N will attempt to transmit a PUCCH until time slot (N+K-1), and even if the actual number of repeated PUCCH transmissions (or time slots) is less than K, the terminal will no longer transmit PUCCHs in time slot (N+K).

[0291] iii) The terminal attempts to transmit PUCCH in K consecutive time slots starting from time slot N, which is instructed to be used for the transmission of PUCCH, wherein the K consecutive time slots are the remaining time slots excluding the time slot in which PUCCH cannot be transmitted according to the semi-static DL / UL assignment information.

[0292] Figure 16 This is a diagram illustrating the time slots that perform repeated PUCCH transmissions according to the time slot configuration.

[0293] refer to Figure 16 (a) describes the case where the terminal transmits Type 1 PUCCH 1500 when it is configured (according to the semi-static DL / UL assigned time slot configuration) to repeatedly transmit Type 1 PUCCH 1500 over two time slots. Here, flexible symbols can be changed to DL symbols or UL symbols by means of dynamic time slot configuration information or scheduling information of UE-specific DCI. The symbols in which Type 1 PUCCH 1500 is transmitted are assumed to be symbols 8 to 13 within the time slot. A time slot includes 14 symbols, and the symbols are indexed from 0 to 13.

[0294] Examining each slot configuration based on the semi-static DL / UL assignment, in slot 0, symbol 0 is the DL symbol while symbols 7-13 are UL symbols. In slot 1, symbols 0-10 are DL symbols, while symbols 12-13 are UL symbols. In slot 2, symbols 0-1 are DL symbols, while symbols 10-13 are UL symbols. In slot 3, symbol 0 is the DL symbol, while symbols 7-13 are UL symbols. All other symbols besides the UL and DL symbols are flexible symbols.

[0295] Therefore, the first type PUCCH 1500 can be transmitted in slots 0 and 3 regardless of the dynamic slot configuration information, but cannot be transmitted in slot 1 regardless of the dynamic slot configuration information. Furthermore, the first type PUCCH 1500 can be transmitted if symbols 8 and 9 are indicated as UL symbols in slot 2 by the dynamic slot configuration information; otherwise, the first type PUCCH 1500 may not be transmitted.

[0296] Figure 16 The terminal in illustration (a) attempts to transmit the first type PUCCH 1500 in the time slot described in i). In this case, since symbols 8 and 9 of time slot 2 are not indicated as UL symbols via dynamic time slot configuration information, it is assumed that the terminal cannot transmit 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 transmits the first type PUCCH 1500 repeatedly after time slot 3.

[0297] Figure 16The illustration in (b) attempts to transmit the first type PUCCH 1500 in a time slot using the aforementioned ii). Since the first type PUCCH 1500 is configured to be transmitted repeatedly 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 cannot transmit it due to overlap with the DL symbol according to the configuration of the semi-static DL / UL assignment information.

[0298] Figure 16 The illustration in (c) attempts to transmit the first type PUCCH 1500 in a time slot using the aforementioned repetition iii). The first type PUCCH 1500 is configured to be transmitted repeatedly in two time slots (K=2), but time slot 1 is the time slot in which the first type PUCCH 1500 cannot be transmitted due to semi-static DL / UL assignment information. Therefore, the terminal attempts to transmit the first type PUCCH 1500 in time slots 0 and 2. As indicated by the dynamic time slot configuration information, time slot 2 may or may not actually transmit the first type PUCCH 1500.

[0299] [Fourth Embodiment]

[0300] The fourth embodiment relates to 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 configurations including TDD-based DL symbols, flexible symbols, and UL symbols. The physical channels transmitted by the terminal are physical uplink channels and include PRACH, PUCCH, PUSCH, SRS, etc. The physical channels transmitted by the base station are physical downlink channels and include PDSCH, PDCCH, PBCH, etc. Hereinafter, this specification defines procedures for repeated transmission of PUCCH for both the terminal and the base station, procedures for repeated transmission of PUSCH for both the terminal and the base station, and procedures for repeated transmission of PDSCH for both the terminal and the base station. The PUCCH or repeated PUCCH described below can be a first type PUCCH or a second type PUCCH.

[0301] (Method 1) — Resource determination process for repeated transmission of PUCCH by terminal and base station

[0302] The number of time slots in which PUCCH is transmitted or the number of times PUCCH transmissions are repeated can be one of predetermined values ​​(e.g., 1, 2, 4, and 8), and the value actually configured for the terminal is sent via an RRC message. If the number of times PUCCH transmissions are repeated is configured to 1, this indicates a normal PUCCH transmission rather than a repeatedly transmitted PUCCH.

[0303] The start point and length of symbols in the time slot where PUCCH is transmitted are included in information related to a PUCCH resource configured by the base station. Information related to PUCCH resources can be configured via RRC parameters. A set of PUCCH resources, including at least one PUCCH resource, can be configured or assigned to the terminal via RRC signaling. The base station can indicate at least one PUCCH resource index in 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. The PRI can have a size of 2 bits or 3 bits.

[0304] In this way, the configured PUCCH resource set or PUCCH resource index can be kept the same over multiple time slots in which PUCCHs are repeatedly transmitted. The terminal determines whether to transmit a PUCCH indicated by the DCI, and this determination is based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information may include at least one of UL-DL configuration common information (TDD-UL-DL-ConfigurationCommon) that can be indicated via RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) that can be additionally indicated to the terminal via RRC signaling.

[0305] For example, i) the UL-DL configuration public information may indicate the period in which semi-static DL / UL assignment information is applied, and may indicate the number of DL symbols, UL symbols, and flexible symbols configured on multiple time slots included in the period. ii) UL-DL configuration specific information may include information for overriding the flexible symbols in the semi-static DL / UL time slot configuration provided through the UL-DL configuration public information with UL symbols, DL symbols, and flexible symbols. That is, the terminal may overridden the flexible symbols in the time slot format provided through the UL-DL configuration public information with another type of symbol based on the UL-DL configuration specific information.

[0306] If the symbol to be transmitted for PUCCH 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) in each time slot indicated by the base station for PUCCH transmission, the terminal determines whether to transmit the PUCCH based on the direction of the indicated symbol. For example, if the symbol in the time slot indicated by the base station is a DL symbol, the terminal postpones the transmission of the PUCCH to a subsequent time slot, while if one of the indicated symbols is a UL symbol and a flexible symbol, the terminal transmits the PUCCH in the corresponding time slot. As another example, if the symbol in the time slot indicated by the base station is a DL symbol or a flexible symbol, the terminal postpones the transmission of the PUCCH to a subsequent time slot, while if the indicated symbol is a UL symbol, the terminal transmits the PUCCH in the corresponding time slot. PUCCH that is not transmitted in the corresponding time slot can be postponed to a subsequent time slot.

[0307] The terminal repeatedly transmits PUCCH across multiple time slots until the number of repetitions of PUCCH transmission indicated / configured via RRC messages is reached. The terminal can determine the time slots for transmitting PUCCH across the multiple time slots based on UL symbols and unknown (or flexible) symbols, according to information transmitted via RRC messages. For example, the terminal can determine time slots that include the starting position of the symbols used for PUCCH transmission and the number of UL symbols as time slot resources for performing PUCCH transmission. These time slots include UL symbols and flexible symbols configured via RRC messages. The base station can receive the PUCCH repeatedly transmitted by the terminal across multiple time slots based on at least one of UL-DL configuration public information and UL-DL configuration private information.

[0308] If at least one of the symbols used to transmit PUCCH in the first time slot of a time slot assigned to repeat PUCCH transmission overlaps with a DL symbol, the terminal cancels the PUCCH transmission and does not transmit PUCCH in the corresponding time slot. That is, if the symbols used to transmit PUCCH in the first time slot of a time slot assigned to repeat PUCCH transmission are configured with UL symbols and flexible symbols, the terminal can transmit PUCCH in the corresponding time slot. If at least one of the symbols used to transmit PUCCH overlaps with a DL symbol or a flexible symbol after PUCCH transmission in a time slot following the first time slot of a time slot assigned to repeat PUCCH transmission, the terminal cancels the PUCCH transmission and does not transmit PUCCH in that time slot. That is, if the time slot for PUCCH transmission is indicated by the base station in a time slot following the first time slot of a time slot assigned to repeat PUCCH transmission, and the symbols in that time slot are configured with UL symbols, i.e., symbols indicated for PUCCH transmission, the terminal can transmit PUCCH in the corresponding time slot.

[0309] The following section describes the PUCCH processing method related to the gap symbol.

[0310] There may be a gap between the DL symbol and the UL symbol for DL-UL handover. The gap can be located in a flexible symbol. That is, some symbols in the flexible symbol between the DL symbol and the UL symbol may be used for the DL-UL handover gap and may not be used for DL ​​reception or UL transmission. If the number of symbols used for the gap is represented as G, then G can be fixed to a specific value such as 1 or 2, can be set / configured to the terminal via an RRC message, and can be obtained via a timing advance (TA) value.

[0311] If a symbol to be transmitted in a PUCCH slot overlaps with a symbol configured in each time slot indicated by the base station for PUCCH transmission via semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration specific information), the terminal determines whether to transmit the PUCCH based on the type (or direction) of the indicated symbol. For example, if all indicated symbols are UL symbols, the terminal transmits the PUCCH; however, if at least one of the indicated symbols includes a DL symbol or one of the G consecutive flexible symbols immediately following that DL symbol, the terminal does not transmit the PUCCH in the corresponding time slot. The terminal may defer the PUCCH not transmitted in the corresponding time slot to a subsequent time slot. In other words, in a time slot indicated by the base station for PUCCH transmission, if the symbol to be transmitted in a PUCCH slot is a UL symbol, the terminal transmits the PUCCH; however, if the symbol to be transmitted in a PUCCH slot overlaps with a DL symbol or at least one of the G consecutive flexible symbols immediately following that DL symbol, the terminal does not transmit the PUCCH in that time slot. The terminal can postpone PUCCH transmissions that are not scheduled to be sent in the corresponding time slot to a later time slot. That is, if a PUCCH overlaps with any of the DL symbols or any of the G symbols that can be used as gaps, the PUCCH is not sent and the transmission is postponed to a later time slot.

[0312] Regarding the PUCCH processing method across multiple time slots, the terminal repeatedly transmits PUCCH until the number of repetitions of PUCCH transmission set / configured via RRC messages is reached across multiple time slots. The terminal can determine the time slots for PUCCH transmission across multiple time slots based on the type and number of symbols according to the information sent via RRC messages.

[0313] 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 set / configured through semi-static UL / DL assignment information. For example, if the "number of UL symbols + number of flexible symbols - number of gap symbols" in a time slot includes the PUCCH transmission start symbol position and the number of UL symbols in which the PUCCH is to be transmitted, then the terminal can determine the corresponding time slot as the time slot for PUCCH transmission and can 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 PUCCH transmission start symbol position and the number of UL symbols in which the PUCCH is to be transmitted, then the terminal can determine the corresponding time slot as the time slot for PUCCH transmission and can transmit the PUCCH.

[0314] In this scenario, the base station can receive PUCCHs repeatedly transmitted by the terminal via multiple time slots based on at least one of UL-DL configuration public information and UL-DL configuration private information.

[0315] Figure 17 The diagram shows whether PUCCH is sent according to the time slot configuration.

[0316] refer to Figure 17 The time slot configuration, based on the semi-static DL / UL assignment information, sequentially includes five DL symbols (represented as "D"), three flexible symbols (represented as "X"), and six UL symbols (represented as "U").

[0317] For PUCCH allocation #0, symbols 8 through 14 are configured as resources for PUCCH transmission; for PUCCH allocation #1, symbols 7 through 14 are configured as resources for PUCCH transmission; and for PUCCH allocation #3, symbols 6 through 14 are configured as resources for PUCCH transmission.

[0318] Figure 17 The diagram in (a) shows the case where the gap corresponds to one symbol (G=1). If G=1, PUCCH allocation #0 and PUCCH allocation #1, excluding the flexible symbol immediately following the DL symbol, are transmittable, but PUCCH allocation #2, including the flexible symbol immediately following the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH allocation #2 can be postponed to a subsequent time slot. Of course, the terminal also determines whether to transmit PUCCH allocation #2 in a subsequent time slot according to the same criteria.

[0319] Figure 17The diagram in (b) shows the gap corresponding to the case of two symbols (G=2). If G=2, PUCCH allocation #0, excluding the two consecutive or flexible symbols immediately following the DL symbol, is transmittable, but PUCCH allocation #1 and PUCCH allocation #2, including the 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 a subsequent time slot. Of course, the terminal also determines whether to transmit PUCCH allocation #1 and #2 in a subsequent time slot based on the same criteria.

[0320] (Method 2) — Resource determination process for repeated transmission of PUSCH by terminal and base station

[0321] The number of time slots in which PUSCH is transmitted, or the number of times PUSCH transmissions are repeated, can be one of, for example, predetermined values ​​(e.g., 1, 2, 4, and 8), and the value actually configured for the terminal is sent via an RRC message. If the number of times PUSCH transmissions is repeated is configured to 1, this indicates a regular PUSCH transmission rather than a repeatedly transmitted PUSCH.

[0322] In the case of PUSCH transmission, PUSCH transmission is performed only in the slot configuration suitable for PUSCH transmission among K consecutive slots, without performing the PUSCH transmission delay operation.

[0323] The start symbol and length (transmission duration) of a PUSCH transmission within a time slot are indicated by a DCI and can be maintained the same across all time slots. The terminal determines whether to transmit the PUSCH indicated by the DCI, and this determination can be based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used to determine whether to transmit the PUSCH may include at least one of UL-DL configuration common information (TDD-UL-DL-ConfigurationCommon) that can be indicated via RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) that can be additionally indicated to the terminal via RRC signaling. For example, the UL-DL configuration common information may indicate the period for which the semi-static DL / UL assignment information is applied. The UL-DL configuration common information can be used to configure the number of UL / DL symbols configured per time slot across multiple time slots included in the period, the time slot format configured by the number of UL / DL symbols per time slot, and the number of flexible symbols and time slots per time slot. In other words, the terminal can configure the time slot format for each time slot by using the number of time slots indicated by the UL-DL configuration public information. As another example, the UL-DL configuration specific information may include information for overriding the flexible symbols in the semi-static DL / UL time 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 time slot format provided by the UL-DL configuration public information with another type of symbol based on the UL-DL configuration specific information.

[0324] If the symbol to be transmitted for PUSCH 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) in each time slot indicated by the base station for PUSCH transmission, the terminal determines whether to transmit PUSCH based on the type (or direction) of the indicated symbol. For example, if at least one of the indicated symbols is a DL symbol, the terminal does not perform PUSCH transmission and cancels the PUSCH transmission. If the indicated symbol is a UL symbol and a flexible symbol, the terminal transmits PUSCH in the corresponding time slot. As another example, if at least one of the indicated symbols is a DL symbol or a flexible symbol, the terminal does not perform PUSCH transmission and cancels the PUSCH transmission. If the indicated symbol is a UL symbol, the terminal transmits PUSCH in the corresponding time slot.

[0325] If at least one of the symbols used for PUSCH transmission in the first time slot of the time slot indicated for repeated PUSCH transmission overlaps with a DL symbol, the terminal does not transmit PUSCH in the corresponding time slot and cancels the PUSCH transmission. That is, if the symbols used for PUSCH transmission in the first time slot of the time slot indicated for repeated PUSCH transmission are configured with both UL and flexible symbols, the terminal can transmit PUSCH in the corresponding time slot. If at least one of the symbols used for PUSCH transmission in a time slot following the first time slot of the time slot indicated for repeated PUSCH transmission overlaps with either a DL symbol or a flexible symbol, the terminal does not transmit PUSCH in the corresponding time slot and cancels the PUSCH transmission. That is, if the symbols configured / indicated for PUSCH transmission in a time slot following the first time slot of the time slot indicated for repeated PUSCH transmission are configured with UL symbols, the terminal can transmit PUSCH in the corresponding time slot.

[0326] The following section describes the PUSCH processing method related to gap symbols.

[0327] There may be a gap between the DL symbol and the UL symbol for DL-UL handover. The gap can be located in a flexible symbol. Some symbols in the flexible symbols between the DL symbol and the UL symbol can be used for the DL-UL handover gap and may not be used for DL ​​reception or UL transmission. If the number of symbols used for the gap is represented as G, then G can be fixed to a specific value such as 1 or 2, can be configured to the terminal via an RRC message, and can be obtained via a timing advance (TA) value.

[0328] If a symbol to be transmitted for PUSCH 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 specific information) in each time slot indicated by the base station for PUSCH transmission, the terminal can determine whether to transmit PUSCH based on the type (or direction) of the indicated symbol. For example, if all indicated symbols are UL symbols, the terminal transmits PUSCH; if at least one of the indicated symbols is a DL symbol or G consecutive flexible symbols immediately following that DL symbol, the terminal does not transmit PUSCH in the corresponding time slot. That is, in each time slot indicated by the base station for PUSCH transmission, if the symbol to be transmitted for PUSCH is a UL symbol, the terminal transmits PUSCH; if at least one of the symbols to be transmitted for PUSCH overlaps with a DL symbol or at least one of G consecutive flexible symbols immediately following that DL symbol, the terminal does not transmit PUSCH and cancels PUSCH transmission. In other words, if it overlaps with a DL symbol and any of the G symbols that can be used as a gap, PUSCH is not transmitted and PUSCH transmission is canceled.

[0329] (Method 3) — Resource determination process for repeated reception of PDSCH by terminal and base station

[0330] The number of time slots in which PDSCH is received, or the number of times PDSCH is received, can be one of, for example, predetermined values ​​(e.g., 1, 2, 4, and 8), and the actual value configured for the terminal among these values ​​is sent via an RRC message. If the number of times PDSCH is received is configured to be 1, this indicates a normal PDSCH rather than a repeatedly transmitted PDSCH.

[0331] The starting symbol and symbol duration (length) of the PDSCH received in a time slot are indicated by the DCI and 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 this determination may include at least one of UL-DL configuration common information (TDD-UL-DL-ConfigurationCommon) that can be indicated via RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) that can be additionally indicated to the terminal via RRC signaling. For example, the UL-DL configuration common information may indicate the period in which the semi-static UL / DL assignment information is applied. The UL-DL configuration common information can be used to configure the number of UL / DL symbols configured per time slot across multiple time slots included in the period, the time slot format configured by the number of UL / DL symbols per time slot, and the number of flexible symbols and time slots per time slot. In other words, the terminal can configure the time slot format for each time slot by using the number of time slots indicated by the UL-DL configuration public information. As another example, the UL-DL configuration specific information may include information for overriding the flexible symbols in the semi-static DL / UL time 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 time slot configuration provided by the UL-DL configuration public information with another type of symbol based on the UL-DL configuration specific information.

[0332] If a terminal intends to receive a PDSCH symbol that 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) in a time slot designated by the base station for PDSCH reception, the terminal can determine whether to receive the PDSCH based on the type (or direction) of the indicated symbol. For 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 symbol is a DL symbol and a flexible symbol, the terminal can receive the PDSCH in the corresponding time slot. 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 perform PDSCH reception. If the indicated symbol is a DL symbol, the terminal receives the PDSCH in the corresponding time slot.

[0333] If at least one of the symbols used for PDSCH reception in the first time slot of the time slot indicated for repeated PDSCH reception overlaps with a UL symbol, the terminal does not receive PDSCH in the corresponding time slot. That is, if the symbols used for PDSCH reception in the first time slot of the time slot indicated for repeated PDSCH reception are configured with DL symbols and flexible symbols, the terminal can receive PDSCH in the corresponding time slot. If at least one of the symbols used for PDSCH reception in a time slot following the first time slot of the time slot indicated for repeated PDSCH reception overlaps with a UL symbol or a flexible symbol, the terminal does not receive PUSCH in the corresponding time slot. That is, if the time slot indicated by the base station for PDSCH reception in a time slot following the first time slot of the time slot indicated for repeated PDSCH reception and the symbols in that time slot are configured with DL symbols (i.e., symbols indicated for PDSCH reception), the terminal can receive PDSCH in the corresponding time slot. The terminal can receive PDSCH that was not additionally received in a delayed subsequent time slot.

[0334] The following section describes the PDSCH processing method related to gap symbols.

[0335] There may be a gap between the DL symbol and the UL symbol for DL-UL handover. The gap can be located in a flexible symbol. Some symbols in the flexible symbols between the DL symbol and the UL symbol can be used for the DL-UL handover gap and may not be used for DL ​​reception or UL transmission. If the number of symbols used for the gap is represented as G, then G can be fixed to a specific value such as 1 or 2, can be configured to the terminal via an RRC message, and can be obtained via a timing advance (TA) value.

[0336] If a symbol for which PDSCH is to be received 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) in a time slot designated by the base station for PDSCH reception, the terminal determines whether to receive the PDSCH based on the type (or direction) of the indicated symbol. For example, if all indicated symbols are DL symbols, the terminal receives the PDSCH; if at least one of the indicated symbols is a UL symbol or G consecutive flexible symbols immediately preceding that UL symbol, the terminal does not receive the PDSCH.

[0337] In other words, in a 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; however, if the symbol to be received overlaps with a UL symbol or at least one of the G consecutive flexible symbols immediately preceding that UL symbol, the terminal does not perform PDSCH reception. Specifically, if the symbol to be transmitted in that slot overlaps with either a UL symbol or any of the G symbols that can be used as a gap, the base station does not transmit the PDSCH and cancels its transmission. The base station then postpones the transmission of the PDSCH to a subsequent time slot.

[0338] If the terminal cancels the reception of PDSCH based on the semi-static DL / UL assignment information, then a new HARQ-ARQ timing configuration method needs to be defined because the HARQ-ARQ timing can be changed.

[0339] If the reception of a PDSCH is cancelled, a new HARQ-ARQ timing can be determined based on the received PDSCH without the cancellation itself. That is, 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 included in the DCI indicating PDSCH reception and the cancelled PDSCH. For example, a terminal indicated to have four time slots for HARQ-ACK timing can send the HARQ-ACK four time slots after the time slot in which the last PDSCH was received.

[0340] Even if PDSCH reception is cancelled, the HARQ-ARQ timing remains unchanged and can be determined by assuming PDSCH has been received. That is, to determine the time slot in which the actual HARQ-ACK is sent, the terminal can perform calculations based on the last PDSCH before cancellation and the HARQ-ACK timing included in the DCI indicating PDSCH reception. For example, even if PDSCH reception is cancelled, a terminal instructed to have four time slots for HARQ-ACK timing can still send the HARQ-ACK four time slots after the last time slot of the allocated PDSCH.

[0341] Terminals can be configured to perform inter-slot frequency hopping to achieve frequency diversity. Therefore, even when a terminal repeatedly transmits PUCCH (or PDSCH or PUSCH) via multiple time slots, a method for performing inter-slot frequency hopping by the terminal needs to be defined. Below, this specification provides a description of the Physical Resource Block (PRB) through which PUCCH (or PDSCH or PUSCH) is transmitted in each time slot during inter-slot frequency hopping. This specification also provides a description of an algorithm for determining the PRB based on the difference between the time slot in which the PUCCH was first transmitted and the current time slot, regardless of the number of repeated PUCCH transmissions.

[0342] The inter-slot frequency hopping method during PUCCH transmission may include the terminal determining the resource block (RB) for PUCCH transmission based on the index of a first time slot in which repeated PUCCH is first transmitted and the index of a second time slot. In this case, the first time slot is the time slot indicated by the base station for PUCCH transmission, and the second time slot is the time slot in which PUCCH is transmitted after the first time slot during repeated PUCCH transmission. Here, the value in time slot n can be obtained through Equation 1 below. s The RB or the starting RB index of the RB that sends the PUCCH.

[0343] [Equation 1]

[0344]

[0345] In Equation 1, RB1 and RB2 are the starting RB indices of the first and second hops, respectively, and are signaled to the terminal via RRC messages for terminal setup / configuration. s,0 It is the index of the slot in which the PUCCH is first sent. In this scheme, based on the delay of repeated PUCCHs, transmission can be performed with only one hop while PUCCHs are being repeatedly sent.

[0346] The inter-slot frequency hopping method during PUCCH transmission may include performing a hopping whenever the terminal actually transmits a repeated PUCCH. The RB can be determined by the slot index of the PUCCH transmitted via it and the actual number of repetitions. More specifically, this can be obtained through Equation 2 for slot n. s The RB or the starting RB index of the RB that sends the PUCCH.

[0347] [Equation 2]

[0348]

[0349] In Equation 2, RB1 and RB2 are the starting RB indices of the first and second hops, respectively, and are signaled to the terminal via RRC messages for terminal setup / configuration. repeat(n s ) is in time slot n s The previous number of PUCCH retransmissions. In this scheme, PUCCH can be sent via two different hops, regardless of the delay of the repeated PUCCH.

[0350] [Fifth Embodiment]

[0351] In addition to the method and determination process of repeatedly transmitting PUCCH over multiple time slots to improve PUCCH coverage, the fifth embodiment also describes a method for determining, from multiple time slots, the time slots through which repeated PUCCH transmissions will be performed. Specifically, a method is described for a terminal to determine, from multiple time slots, the time slots used for PUCCH transmissions.

[0352] 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 access. SS / PBCH blocks can be transmitted at the determined locations, and configuration regarding the transmission of SS / PBCH blocks can be sent from the base station to the terminal via RRC messages (e.g., SSB_transmitted-SIB1 information or SSB_transmitted) to set / configure the terminal. Among the time slots indicated by the configuration regarding the transmission of SS / PBCH blocks, there may be flexible symbols where the transmission of SS / PBCH blocks is possible. 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 overlap between at least one of the flexible symbols where PUCCH transmission is possible and the flexible symbols used for the transmission of SS / PBCH blocks. For example, the terminal can determine the time slots for repeated PUCCH transmissions by excluding time slots containing overlapping symbols from the time slots used for repeated PUCCH transmissions, thereby preventing collisions. Therefore, the terminal can determine multiple time slots for PUCCH transmission based on SSB_transmitted-SIB1 and SSB_transmitted, and if PUCCH is repeatedly transmitted over multiple time slots, the base station can receive repeated PUCCH from the terminal.

[0353] The terminal can determine the time slots for PUCCH transmission based on semi-static DL / UL assignment information and gaps.

[0354] In this specification, it is assumed that the gap is located in the symbol immediately preceding the symbol used for PUCCH transmission, and that the gap includes one or two symbols. However, in addition to the above description, the number and position of the symbols for 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 taking into account two or more gap symbols, the terminal may determine the time slot used for PUCCH transmission or may determine whether to postpone PUCCH transmission.

[0355] A time slot can be determined based on at least one of the following: whether a PDSCH is allocated in the time slot, whether a control resource set (CORESET) for PDCCH monitoring is assigned to a DL symbol in the time slot, whether a CSI-RS is assigned in the time slot, whether an SS / PBCH block is assigned in the time slot, and semi-static DL / UL assignment information. For example, if the symbol immediately preceding a flexible symbol is a DL symbol and a PDSCH is allocated to that DL symbol, the terminal does not consider the flexible symbol as a resource for PUCCH transmission. Alternatively, the terminal can determine a time slot that includes other UL symbols and flexible symbols as a time slot for PUCCH transmission. If the symbol immediately preceding a flexible symbol is a DL symbol and a PDSCH is not allocated to that DL symbol, the flexible symbol is an unassigned symbol. Therefore, the terminal will not identify an unassigned symbol as a slot for DL-UL handover. The terminal can then consider 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. As another example, if the symbol immediately preceding the flexible symbol is a DL symbol and a CORESET or search space for PDCCH monitoring is assigned to that DL symbol, the terminal can exclude time slots containing that flexible symbol from the time slots used for repeated PUCCH transmissions in order to monitor the allocated PDCCH. As another example, if the symbol immediately preceding the flexible symbol is a DL symbol and a CORESET or search space for PDCCH monitoring is assigned to that DL symbol, the terminal can choose not to monitor the allocated PDCCH and can consider that flexible symbol as a resource capable of repeated PUCCH transmissions and determine it as a time slot for PUCCH transmissions.

[0356] As another example, a terminal can determine the time slot for PUCCH transmission using semi-static DL / UL assignment information. The terminal can identify the time slot and symbol for performing the PUCCH transmission 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 repeating the PUCCH transmission so that the PUCCH can be transmitted in the corresponding time slot. If the symbol immediately preceding the symbol indicated for PUCCH transmission is a DL symbol indicated in the semi-static DL / UL assignment information, the terminal may not transmit the repeat PUCCH in the corresponding time slot and can defer the PUCCH transmission to a later available time slot. In other words, if the terminal can identify the symbols used for PUCCH transmission in each time slot via RRC messages and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with the DL symbol of the semi-static DL / UL assignment information, or if the symbol immediately preceding the symbol in which the PUCCH is to be transmitted is the DL symbol of the semi-static DL / UL assignment information, 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. PUCCHs that fail to be transmitted can be postponed for transmission in subsequent available time slots.

[0357] As another example, a terminal can determine the time slot for PUCCH transmission using information scheduled from the base station. The terminal can identify the time slot and symbols for PUCCH transmission 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 no PDSCH is scheduled in the symbols immediately preceding the symbol indicated for PUCCH transmission, the terminal can determine the corresponding time slot as the time slot for PUCCH transmission so that PUCCH can be transmitted in the corresponding time slot. If PDSCH is scheduled in the symbols immediately preceding the symbol indicated for PUCCH transmission, the terminal can postpone PUCCH transmission to a subsequent available time slot instead of transmitting PUCCH in the corresponding time slot. In other words, the terminal can identify the symbols in each time slot to which PUCCH should be transmitted via RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if a PDSCH is scheduled in a symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal may not transmit the PUCCH in the corresponding time slot; otherwise, the terminal may transmit the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUCCHs that fail to be transmitted can be postponed for transmission in a later available time slot.

[0358] As another example, a terminal can determine the time slot for PUCCH transmission using CSI-RS information set / configured from the base station. The terminal can identify, via RRC messages and dynamic signaling (e.g., PRI), which symbol in which time slot the PUCCH should be transmitted. 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. If CSI-RS reception is configured in the symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal can postpone PUCCH transmission to a subsequent available time slot instead of transmitting the PUCCH in the corresponding time slot. In other words, the terminal can identify, via RRC messages and / or dynamic signaling (e.g., PRI), which symbol in each time slot should transmit the PUCCH. If even one or more of the identified symbols overlaps with the DL symbol in the semi-static DL / UL assignment information, or if CSI-RS reception is configured in a symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal may not transmit the PUCCH in the corresponding time slot; otherwise, the terminal may transmit the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUCCHs that fail to be transmitted can be postponed for transmission in a later available time slot.

[0359] As another example, a terminal can determine the time slot for PUCCH transmission using PDCCH monitoring information configured for the terminal. The terminal can identify, via RRC messages and dynamic signaling (e.g., PRI), which symbol in which time slot the PUCCH should be transmitted. If at least one of the symbols indicated for PUCCH transmission overlaps with a flexible symbol in the semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or assigned) in the symbols 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. If PDCCH monitoring is configured (or assigned) in the symbols immediately preceding the symbol indicated for PUCCH transmission, the terminal can postpone the PUCCH transmission to a later available time slot instead of transmitting the PUCCH in the corresponding time slot. In other words, if the terminal can identify the symbols to be transmitted in each time slot based on RRC messages and / or dynamic signaling (e.g., PRI), 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 indicated for PUCCH transmission, the terminal may not transmit PUCCH in the corresponding time slot; otherwise, the terminal may transmit PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUCCHs that fail to be transmitted can be postponed for transmission in subsequent available time slots.

[0360] As another example, a terminal can identify the time slot and symbol in which a PUCCH should be transmitted via RRC messages and dynamic signaling (e.g., PRI). There may be cases where 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 symbol immediately preceding the symbol indicated for PUCCH transmission does not overlap with the SS / PBCH block. In this case, the terminal can determine the corresponding time slot as the time slot for PUCCH transmission so that it can transmit the PUCCH in that time slot. If the symbol immediately preceding the symbol indicated for PUCCH transmission overlaps with the SS / PBCH block, the terminal can postpone the PUCCH transmission to a subsequent available time slot instead of transmitting the PUCCH in the corresponding time slot. In other words, the terminal can identify the symbol in each time slot to be transmitted in based on RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if a symbol immediately preceding the symbol indicated for PUCCH transmission overlaps with an SS / PBCH block, the terminal may not transmit the PUCCH in the corresponding time slot; otherwise, the terminal may transmit the PUCCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUCCHs that fail to be transmitted can be postponed for transmission in a later available time slot.

[0361] In this specification, when describing whether PUCCH transmission is performed and whether a delay is made, the description is primarily based on at least one symbol, considering the symbol immediately preceding the symbol used for PUCCH transmission. However, the handover gap between DL and UL can be configured / applied differently depending on the configuration of the base station and the terminal; therefore, the number of gap symbols is not limited to one symbol and can certainly be configured / applied to various symbols.

[0362] It is possible that a symbol designated as a DL symbol by dynamic signaling (e.g., SFI) in a time slot ends at a symbol immediately preceding the symbol used for repeated PUCCH transmission, and the PUCCH resource is configured to perform transmission for repeated PUCCH from the subsequent symbol. The terminal may not transmit PUCCH in that time slot and postpone transmission to a subsequent time slot, and the postponed time slot could be the earliest of the time slots where PUCCH can be transmitted.

[0363] A more concrete example will be used to describe the method of determining the time slot for PUCCH transmission based on whether the terminal allocates PDSCH in the time slot. Here, it is assumed that a time slot consists of 14 symbols.

[0364] For example, suppose the UL symbol resources for PUCCH are configured with the last 12 symbols of a time slot, and a specific time slot sequentially includes 2 DL symbols, 2 flexible symbols, and 10 UL symbols. If PDSCH is allocated to the 2 DL symbols immediately preceding the 2 flexible symbols, the terminal implicitly considers the first flexible symbol as the handover gap between DL and UL. The terminal determines whether the remaining 1 flexible symbol and 10 UL symbols after excluding the first flexible symbol are configurable as resources for PUCCH transmission. However, since the UL symbol resources for PUCCH are configured with the last 12 symbols of a time slot, the terminal can exclude that time slot from the time slot resources for PUCCH transmission (because the UL symbols (including flexible symbols) available for PUCCH transmission are the last 11 symbols). In the example above, if the UL symbol resources for PUCCH were configured with the last 11 symbols of a time slot, the terminal could identify that time slot as a time slot resource for PUCCH transmission.

[0365] As another example, suppose the UL symbol resource for PUCCH is configured with the last 6 symbols of a time slot, and a specific time slot sequentially includes 8 DL symbols, 2 flexible symbols, and 4 UL symbols. If PDSCH is allocated to the first 8 DL symbols, the terminal implicitly considers the first flexible symbol as the handover gap between DL and UL. The terminal determines whether the remaining 1 flexible symbol and 4 UL symbols after excluding the first flexible symbol are configurable as PUCCH resources. However, since the UL symbol resource for PUCCH is configured with the last 6 symbols of a time slot, the terminal can exclude that time slot from the time slot resources available for PUCCH transmission (because the UL symbols (including flexible symbols) available for PUCCH transmission are the last 5 symbols). In the example above, if the UL symbol resource for PUCCH is configured with the last 5 symbols of a time slot, the terminal can identify that time slot as a time slot resource for PUCCH transmission.

[0366] [Sixth Embodiment]

[0367] In addition to the method and determination process of repeatedly transmitting PUSCH over multiple time slots to improve PUSCH coverage, the sixth embodiment also relates to a method for determining, from multiple time slots, the time slots through which repeated PUSCH transmissions are to be performed.

[0368] The time slot for PUSCH transmission can be determined based on at least one of the following: whether a PDSCH is allocated in the time slot, whether a control resource set (CORESET) for PDCCH monitoring is assigned to a DL symbol in the time slot, whether a CSI-RS is assigned in the time slot, whether an SS / PBCH block is assigned in the time slot, and semi-static DL / UL assignment information. For example, the terminal can determine the time slot for PUSCH transmission using semi-static DL / UL assignment information. The terminal can identify the time slot and symbol for PUSCH transmission 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 the 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 so that PUSCH can be transmitted in the corresponding time slot. If the symbol immediately preceding the symbol indicated for PUSCH transmission is a DL symbol as indicated in the semi-static DL / UL assignment information, the terminal may not transmit PUSCH in the corresponding time slot and may postpone PUSCH transmission to a subsequent available time slot. In other words, the terminal can identify the symbol to be transmitted in each time slot based on RRC messages and / or dynamic signaling (e.g., PRI). If even at least one of the identified symbols overlaps with the DL symbol in the semi-static DL / UL assignment information, or if the symbol immediately preceding the symbol to be transmitted in the time slot is a DL symbol in the semi-static DL / UL assignment information, the terminal may not transmit PUSCH in the corresponding time slot; otherwise, the terminal may transmit PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUSCH that fails to be transmitted can be postponed for transmission in a subsequent available time slot.

[0369] As another example, a terminal can determine the time slots for PUSCH transmission using information scheduled to the terminal. The terminal can identify the time slots and symbols in which PUSCH should be transmitted 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 no PDSCH is scheduled in the symbols immediately preceding the symbols indicated for PUSCH transmission, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission so that PUSCH can be transmitted in the corresponding time slot. If PDSCH is scheduled in the symbols immediately preceding the symbols indicated for PUSCH transmission, the terminal can defer PUSCH transmission to a later available time slot instead of transmitting PUSCH in the corresponding time slot. In other words, the terminal can identify the symbols in each time slot to which PUSCH should be transmitted based on RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if a PDSCH is scheduled in a 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; otherwise, the terminal transmits the PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUSCHs that fail to be transmitted can be postponed for transmission in a later available time slot.

[0370] As another example, a terminal can determine the time slot for PUSCH transmission using CSI-RS information set / configured from the base station. The terminal can know, via RRC messages and dynamic signaling (e.g., PRI), which symbol in which time slot the PUSCH should be transmitted. 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 to transmit the PUSCH in that time slot. If CSI-RS reception is configured in the symbol immediately preceding the symbol indicated for PUSCH transmission, the terminal does not transmit the PUSCH in the corresponding time slot. In other words, the terminal can identify the symbol in each time slot to which PUSCH should be transmitted based on RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if CSI-RS reception is configured in a symbol immediately preceding the symbol indicated for PUSCH transmission, the terminal may not transmit PUSCH in the corresponding time slot; otherwise, the terminal may transmit PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUSCH that fails to be transmitted can be postponed for transmission in a later available time slot.

[0371] As another example, a terminal can determine the time slots for PUSCH transmission using PDCCH monitoring information set / configured from the base station. The terminal can identify the time slots and symbols in which PUSCH should be transmitted 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 symbols immediately preceding the symbol indicated for PUSCH transmission, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission in order to transmit PUSCH in the corresponding time slot. If PDCCH monitoring is configured (or assigned) in the symbols immediately preceding the symbol indicated for PUSCH transmission, the terminal may not transmit PUSCH in the corresponding time slot. In other words, the terminal can identify the symbols in each time slot to which PUSCH should be transmitted via RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if PDCCH monitoring is configured in a symbol immediately preceding the symbol in which PUSCH is to be transmitted, the terminal does not transmit PUSCH in the corresponding time slot; otherwise, the terminal transmits PUSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PUSCH that fails to be transmitted can be postponed for transmission in a later available time slot.

[0372] As another example, a terminal can identify the time slot and symbols in which PUSCH should be transmitted 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 symbol immediately preceding the symbol indicated for PUSCH transmission does not overlap with the SS / PBCH block, the terminal can determine the corresponding time slot as the time slot for PUSCH transmission so that PUSCH can be transmitted in the corresponding time slot. If the symbol immediately preceding the symbol indicated for PUSCH transmission overlaps with the SS / PBCH block, the terminal does not transmit PUSCH in the corresponding time slot. In other words, the terminal can know the symbols in each time slot to be transmitted via RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if the symbol immediately preceding the symbol in which PUSCH is to be transmitted overlaps with an SS / PBCH block, the terminal will not transmit PUSCH in the corresponding 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. PUSCH that fails to be transmitted can be postponed for transmission in a later available time slot.

[0373] In this disclosure, when describing PUSCH transmission and delay, the description is primarily based on examples of at least one symbol, considering the symbol immediately preceding the symbol used for PUSCH transmission. However, the DL-UL handover gap can be configured differently depending on the base station and terminal configurations, so one or more symbols can certainly be considered to determine whether to perform PUSCH transmission and delay.

[0374] [Seventh Embodiment]

[0375] In addition to the method and determination process of repeatedly transmitting PDSCH over multiple time slots to improve PDSCH coverage, the seventh embodiment also relates to a method for determining, from multiple time slots, the time slots through which repeated PDSCH transmissions are to be performed.

[0376] The time slot in which PDSCH is to be received can be determined based on at least one of the following: whether PUSCH is allocated in the time slot, whether PUCCH is allocated, whether SRS transmission is assigned, whether PRACH transmission is assigned, and semi-static DL / UL assignment information.

[0377] For example, a terminal can determine the time slot in which to receive PDSCH using semi-static DL / UL assignment information. The terminal can identify the time slot and symbol in which PDSCH should be received 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 the symbol immediately following the symbol indicated for 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 to receive PDSCH in that time slot. If the symbol immediately following the symbol indicated for 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, the terminal can identify the symbol in each time slot to transmit PDSCH based on RRC messages and / or dynamic signaling (e.g., PRI). If at least one of the identified symbols overlaps with the UL symbol of the semi-static DL / UL assignment information, or if the symbol immediately following the symbol in which the PDSCH is to be transmitted is the UL symbol of the semi-static DL / UL assignment information, then the terminal does not receive the PDSCH in the corresponding time slot; otherwise, the terminal receives the PDSCH in the corresponding time slot.

[0378] As another example, a terminal can determine the time slot for PDSCH reception using uplink information (PUSCH, PUCCH, PRACH, SRS, etc.) scheduled from the base station. The terminal can identify the time slot and symbols in which PDSCH should be received 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 PUSCH, PUCCH, PRACH, or SRS is not scheduled in the symbols immediately following the symbol indicated for PDSCH reception, the terminal can determine the corresponding time slot as the time slot for PDSCH reception to receive PDSCH in that time slot. If PUSCH, PUCCH, PRACH, or SRS is scheduled in the symbols immediately following the symbol indicated for PDSCH reception, the terminal does not receive PDSCH in the corresponding time slot. In other words, the terminal can identify the symbols in each time slot to receive PDSCH via RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with the UL symbol of the semi-static DL / UL assignment information, or if PUSCH, PUCCH, PRACH, or SRS is scheduled in a symbol immediately following the symbol in which PDSCH is to be transmitted, the terminal does not receive PDSCH in the corresponding time slot; otherwise, the terminal receives PDSCH in the corresponding time slot. Here, PUCCH can be used for the transmission of HARQ-ACK. Alternatively, PUCCH can be used for the transmission of scheduling requests (SR).

[0379] As another example, a terminal can determine the time slots for PDSCH transmission using CSI-RS information set / configured from the base station. The terminal can identify the time slots and symbols in which PDSCH should be transmitted 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 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 in that time slot. If CSI-RS reception is configured in the symbol immediately preceding the symbol indicated for PDSCH reception, the terminal can postpone PDSCH transmission to a subsequent available time slot instead of transmitting PDSCH in the corresponding time slot. In other words, the terminal can identify the symbols in each time slot to which PDSCH should be transmitted via RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if CSI-RS reception is configured in a symbol immediately preceding the symbol in which PDSCH is to be transmitted, the terminal does not transmit PDSCH in the corresponding time slot; otherwise, the terminal transmits PDSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PDSCH that fails to be transmitted can be postponed for transmission in a later available time slot.

[0380] As another example, a terminal can determine the time slots for PDSCH transmission using PDCCH monitoring information set / configured from the base station. The terminal can identify the time slots and symbols in which PDSCH should be transmitted via RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PDSCH 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 in which PDSCH is to be transmitted, the terminal can determine the corresponding time slot as the time slot for PDSCH transmission and transmit PDSCH in that time slot. If PDCCH monitoring is configured (or assigned) in the symbol immediately preceding the symbol indicated for PDSCH reception, the terminal can postpone PDSCH transmission to a subsequent available time slot instead of transmitting PDSCH in the corresponding time slot. In other words, the terminal can identify the symbols in each time slot to which PDSCH should be transmitted via RRC messages and / or dynamic signaling (e.g., PRI). If even one or more of the identified symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if PDCCH monitoring is configured in a symbol immediately preceding the symbol in which PDSCH is to be transmitted, the terminal does not transmit PDSCH in the corresponding time slot; otherwise, the terminal transmits PDSCH in the corresponding time slot. This is because a handover gap between DL and UL may be required. PDSCH that fails to be transmitted can be postponed for transmission in a later available time slot.

[0381] As another example, the SS / PBCH block can be configured to overlap with the DL symbol, flexible symbol, and UL symbol of the semi-static DL / UL assignment information associated with the terminal. In this case, the terminal can consider the symbol overlapping with the SS / PBCH block as a semi-static DL symbol. That is, if a semi-static UL symbol is configured to 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 corresponds to a semi-static flexible symbol.

[0382] When describing whether to perform PDSCH transmission and postponement, the description is provided based on at least one symbol, considering the symbol immediately preceding the symbol used for PDSCH transmission. However, the DL-UL handover gap can be configured differently depending on the base station and terminal configurations, so it is certainly possible to consider one or more symbols to determine whether to perform PDSCH transmission and postponement.

[0383] [Eighth Embodiment]

[0384] The eighth embodiment addresses a situation where the gap between the DL symbol requiring downlink reception and the UL symbol requiring uplink transmission is insufficient, thus preventing the terminal from performing both downlink reception and uplink transmission. At least a DL-UL handover gap is required between the terminal's downlink reception and uplink transmission. Here, the DL-UL handover gap can be described interchangeably as a handover gap or simply as a gap.

[0385] The length of the DL-UL handover gap can vary depending on the carrier frequency. For example, if the carrier frequency is 6 GHz or lower (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.

[0386] The DL-UL handover gap is also affected by the timing advance (TA) value and the TA offset value. The DL-UL handover gap may be affected by the subcarrier spacing (SCS). 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 length (duration) of a symbol is X μs, the number of symbols (G) necessary for the DL-UL handover gap can be given as G = ceil((Rx2Tx + TA + TA_offset) / X). Here, Rx2Tx is the time taken for the RF circuit to switch from reception to transmission, and its value can vary depending on the carrier frequency. If the carrier frequency is 6 GHz or lower (FR1), then Rx2Tx can be 13 μs, while if the carrier frequency is 6 GHz or higher (FR2), then Rx2Tx can be 7 μs. The TA can be a TA value configured by the base station for the terminal or the maximum value among the TA values ​​configurable by the base station for the terminal. TA_offset can be 39936*Tc or 25600*Tc in FR1, while it can be 13792*Tc in FR2. Here, Tc = 1 / (480*103*4096). Here, the switching interval can be the RF interrupt time.

[0387] Table 3 provides an example of the number of symbols required for the DL-UL handover gap based on the subcarrier spacing.

[0388] [Table 3]

[0389] Subcarrier spacing configuration for active UL BWP G 15kHz or 30kHz 1 60kHz or 120kHz 2

[0390] Table 4 is another example of the number of symbols required for the DL-UL handover gap based on the subcarrier spacing.

[0391] [Table 4]

[0392] Subcarrier spacing configuration for active UL BWP G 15kHz or 30kHz 2 60kHz or 120kHz 2

[0393] The following describes a method for processing the transmission of uplink channels or uplink signals based on downlink signals received by the terminal and UL-DL handover gaps (G). Downlink signals may include SS / PBCH blocks, PDSCH, PDCCH, periodic signals, measurement signals, etc. Uplink channels may include PUSCH, PUCCH, PRACH, etc., and uplink signals may include SRS, periodic signals, measurement signals, etc.

[0394] (Method 1) — Symbols used for SS / PBCH block transfers and uplink transfers

[0395] Method 1 is a method for processing uplink transmission by a terminal, wherein the terminal can determine whether at least one of the symbols indicated for uplink channel transmission or uplink signal transmission is configured to overlap (i.e., contradict) with a symbol indicated for receiving an SS / PBCH block from a base station (or a symbol for SS / PBCH block transmission), and can transmit the uplink channel or uplink signal based on this determination. Here, if at least some of the symbols in which the SS / PBCH block is received 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.

[0396] Method 1 is another method for processing uplink transmissions by a terminal, wherein the terminal can determine whether at least one of the symbols indicated for uplink channel transmission or uplink signal transmission is configured to overlap with a symbol assigned to indicate an SS / PBCH block to be received from the base station, and can transmit 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.

[0397] (Method 2) — Symbols used for downlink and uplink transmissions

[0398] Method 2 is a method for processing uplink transmission by a terminal, wherein the terminal can determine whether at least one of the symbols indicated for uplink channel transmission or uplink signal transmission is configured to overlap with a symbol (or symbol used for downlink transmission) indicated to receive downlink transmission from the base station, and can transmit the uplink channel or uplink signal based on this determination. Here, if at least some of the symbols in which downlink transmission is received 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.

[0399] Method 2 is another method for processing uplink transmissions by a terminal, wherein the terminal can determine whether at least one of the symbols indicated for uplink channel transmission or uplink signal transmission is configured to overlap with G symbols following the symbol indicated for receiving downlink transmission from the base station, and can transmit 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.

[0400] In addition to the methods described, the base station can also perform scheduling (e.g., Layer 1 (L1) dynamic scheduling) 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, it can configure uplink transmission based on symbol G. In this case, the terminal may not expect the base station to configure its uplink transmission in symbol G.

[0401] If uplink transmission based on RRC configuration is configured instead of L1 dynamic scheduling, the terminal can determine whether the uplink transmission configured via RRC overlaps with symbol G, and based on this determination, the terminal may or may not perform uplink channel or signal transmission.

[0402] The following describes a method for a terminal to handle downlink reception and transmission of uplink channels (or uplink signals) based on UL-DL handover gaps (G). Downlink signals may include SS / PBCH blocks, PDSCH, PDCCH, CSI-RS, etc. Uplink channels may include PUSCH, PUCCH, PRACH, etc., and uplink signals may include SRS, etc.

[0403] (Method 3) — Processing downlink signals based on whether flexible symbols and uplink signals overlap.

[0404] In symbols configured by flexible symbols via semi-static DL / UL assignment information or symbols not configured via semi-static DL / UL assignment information, the terminal may receive or may fail to receive downlink signals configured by UE-specific RRC messages (e.g., downlink periodic signals or measurement signals). In this case, the terminal may process the configured downlink reception based on the arrangement relationship (e.g., overlap relationship) between the UL-DL handover gap and the uplink signals.

[0405] When describing a method for a terminal to process configured downlink reception, the terminal can determine whether it is configured to transmit an uplink signal within G symbols following the last symbol of the configured downlink signal, and can receive the configured downlink signal based on this 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 can receive the configured downlink signal. Conversely, if the uplink signal overlaps within the G symbols, the terminal does not receive the configured downlink signal. That is, if there are no at least G gap symbols between the last DL symbol configured via 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.

[0406] Uplink signals may include uplink signals configured via cell-specific RRC messages. For example, uplink signals configured via cell-specific RRC messages may include PRACH.

[0407] Uplink signaling may include uplink signals indicated by L1 signaling. For example, uplink signals indicated by L1 signaling may include a PUSCH scheduled in DCI format 0_0 or 0_1. Uplink signals indicated by L1 signaling may include a PUCCH that includes a HARQ-ACK response to a PDSCH scheduled in DCI format 1_0 or 1_1. Uplink signals indicated by L1 signaling may include an SRS signal indicated by DCI. Uplink signals indicated by L1 signaling may include a first transmission transmitted via an uplink semi-persistent scheduling (SPS) PDSCH indicated by DCI scrambled with CS-RNTI.

[0408] Downlink signals may include CSI-RS configured via UE-specific RRC messages. For example, downlink signals may include CORESET for PDCCH monitoring configured via UE-specific RRC messages. Downlink signals may include downlink SPS PDSCH transmissions scrambled with CS-RNTI (excluding the first transmission).

[0409] In another method for processing downlink reception by the terminal, the terminal can determine whether the UL symbols configured via semi-static DL / UL assignment information overlap within G symbols following the last symbol of the downlink signal, and can receive the downlink signal based on this determination. As a result of this determination, if the UL symbols configured via 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. That is, if there are no at least G gap symbols between the last DL symbol configured via 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.

[0410] In another method for processing configured downlink reception by the terminal, the terminal can determine whether the UL symbol indicated by the dynamic SFI overlaps within G symbols following the last symbol of the configured downlink signal, and can receive the configured downlink signal based on this determination. As a result of this 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. That is, 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.

[0411] In another method for processing configured downlink reception by the terminal, the terminal can determine whether the DL symbols configured via semi-static DL / UL assignment information overlap within G symbols preceding the first symbol of the uplink signal, and the terminal can receive the configured downlink signal based on this determination. As a result of this determination, if the DL symbols configured via 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. That is, if there are no at least G gap symbols between the last DL symbol configured via 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.

[0412] In another method for processing configured downlink reception by the terminal, the terminal can determine whether the DL symbol indicated by the dynamic SFI overlaps within G symbols preceding the first symbol of the uplink signal, and can receive the configured downlink signal based on this determination. As a result of this determination, if the downlink 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. That is, 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.

[0413] The aforementioned method for processing uplink transmissions by a terminal may include operations in which the terminal does not intend to configure or indicate an uplink signal via L1 signaling during a period of G symbols following a downlink signal (downlink periodic signal or measurement signal) configured via a UE-specific RRC message, in symbols configured by flexible symbols via semi-static DL / UL assignment information or in symbols not configured via semi-static DL / UL assignment information.

[0414] (Method 4) — Processing uplink signals based on whether flexible symbols and downlink signals overlap.

[0415] In symbols configured by flexible symbols via semi-static DL / UL assignment information or symbols not configured via semi-static DL / UL assignment information, the terminal may transmit or may fail to transmit uplink signals configured via UE-specific RRC messages (e.g., uplink periodic signals or measurement signals). In this case, the method by which the terminal handles uplink transmissions may include making a determination based on the arrangement relationship (e.g., overlap relationship) between the UL-DL handover gap and the downlink signals.

[0416] In a method for processing configured uplink transmissions by a terminal, the terminal may transmit the configured uplink signal based on whether it has received 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 the G symbols, the terminal may transmit the configured uplink signal. Conversely, if the downlink signal overlaps within the 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 via 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.

[0417] Here, downlink signals may include downlink signals configured via cell-specific RRC messages. Downlink signals configured via cell-specific RRC messages may include SS / PBCH blocks. Downlink signals configured via 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). Downlink signals configured via cell-specific RRC messages may include a Type-0A common search space. The Type-0A common search space is the search space used to receive PRACH responses during the random access procedure.

[0418] Downlink signaling may include downlink signals indicated by L1 signaling. For example, uplink signals indicated by L1 signaling may include PDSCH scheduled via DCI format 1_0 or 1_1. Uplink signals indicated by L1 signaling may include aperiodic CSI-RS indicated by DCI. Uplink signals indicated by L1 signaling may include a first transmission transmitted via uplink semi-persistent scheduling (SPS) PDSCH indicated by DCI scrambled with CS-RNTI.

[0419] Uplink signals may include SRS configured via UE-specific RRC messages. Uplink signals may include periodic PUCCH and PUSCH configured via UE-specific RRC messages. Uplink signals may include SR configured via UE-specific RRC messages.

[0420] In another method for processing the configured uplink transmission by the terminal, the terminal can determine whether the DL symbols configured via semi-static DL / UL assignment information overlap within G symbols preceding the first symbol of the configured uplink signal, and the terminal can transmit the configured uplink signal based on this determination. As a result of this determination, if the DL symbols configured via semi-static DL / UL assignment information do not overlap within G symbols, the terminal transmits the configured uplink signal; otherwise, the terminal does not transmit the configured uplink signal. That is, if there are no at least G gap symbols between the first UL symbol configured via 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.

[0421] The aforementioned method may additionally include operations in which the terminal does not intend to configure or indicate a downlink signal via L1 signaling during a period of G symbols following a downlink signal (downlink periodic signal or measurement signal) configured via UE-specific RRC message, either in a symbol configured by flexible symbols via semi-static DL / UL assignment information or in a symbol not configured via semi-static DL / UL assignment information.

[0422] In the case of symbols configured by flexible symbols via semi-static DL / UL assignment information or symbols not configured via semi-static DL / UL assignment information, if the number of symbols between the last symbol of the downlink signal configured via cell-specific RRC message or indicated via L1 signaling and the first symbol of the uplink signal configured via cell-specific RRC message or indicated via L1 signaling is less than G, the terminal operates as follows.

[0423] The terminal can receive downlink signals configured via cell-specific RRC messages, but may not send uplink signals configured via cell-specific RRC messages or indicated via L1 signaling.

[0424] The terminal can send uplink signals configured via cell-specific RRC messages and may not receive downlink signals configured via cell-specific RRC messages or indicated via L1 signaling.

[0425] The terminal can operate based on L1 signaling. That is, if L1 signaling indicates downlink reception and a cell-specific RRC message configures uplink transmission, the terminal can perform downlink reception and may 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 and may not perform downlink reception.

[0426] The reception of the synchronization signal block (SSB) in the SS-block-based RRM measurement timing configuration (SMTC) will be described below.

[0427] When the SSB is fully included in the active bandwidth of the terminal, the terminal should be able to perform measurements without measurement gaps. If the subcarrier spacing of the measurement signal differs from that of the PDSCH / PDCCH, or if it falls within the FR2 frequency range, there may be limitations in scheduling flexibility.

[0428] Specifically, if the subcarrier spacing of the measurement signal in frequency range FR1 is the same as that of PDSCH / PDCCH, there are no limitations on scheduling availability. However, if the subcarrier spacing of the measurement signal in frequency range FR1 is different from that of PDSCH / PDCCH, scheduling availability limitations may exist, which will be described later. First, if the terminal is able to receive data signals with different subcarrier spacings and SSBs (that is, if the terminal supports simultaneousRxDataSSB-DiffNumerology), there are no scheduling availability limitations. Conversely, if the terminal cannot receive data signals with different subcarrier spacings and synchronization signal blocks (SSBs) (that is, if the terminal does not support simultaneousRxDataSSB-DiffNumerology), the terminal has limited scheduling availability. In this case, the following scheduling availability limitations apply to SS-RSRP / RSRQ / SINR measurements.

[0429] i) If deriveSSB_IndexFromCell is enabled, the terminal expects to neither receive PDCCH / PDSCH nor send PUCCH / PUSCH within the SMTC window for consecutive SSB symbols, as well as the symbol immediately preceding and following the consecutive SSB symbols.

[0430] ii) If deriveSSB_IndexFromCell is disabled, the terminal expects to neither receive PDCCH / PDSCH nor send PUCCH / PUSCH in any symbol within the SMTC window.

[0431] The deriveSSB_IndexFromCell parameter indicates whether the UE can use the timing of a cell with the same SSB frequency and subcarrier spacing in order to derive the SSB index for the cell with the indicated SSB frequency and subcarrier spacing.

[0432] The following scheduling availability constraints apply to SS-RSRP / SINR measurements in frequency range FR2.

[0433] i) The terminal expects to neither receive PDCCH / PDSCH nor send PUCCH / PUSCH within the SMTC window of consecutive SSB symbols, the symbol immediately preceding the consecutive SSB symbol, and the symbol immediately following the consecutive SSB symbol.

[0434] The following scheduling availability constraints apply to SS-RSRQ measurements in frequency range FR2.

[0435] i) The terminal expects to neither receive PDCCH / PDSCH nor send PUCCH / PUSCH within the SMTC window of consecutive SSB symbols, RSSI measurement symbols, and the symbols immediately preceding and following consecutive SSB / RSSI symbols.

[0436] In the above description, if smtc2 is configured from a higher level, the SMTC window follows smtc2; otherwise, the SMTC window follows smtc1.

[0437] This specification describes a method for determining time slots for repetitive PUCCH transmissions based on scheduling availability constraints when there are limitations on the scheduling availability of receiving measurement signals. Specifically, when a terminal is configured to repeatedly transmit PUCCH K times, the terminal needs to determine K time slots for the repetitive PUCCH transmissions.

[0438] The terminal is configured with carrier aggregation or dual connectivity for transmitting from two or more cells in a bundle, where for convenience it is assumed that two cells are configured. Even when two or more cells are configured, the following description applies. One of the two cells is a Pcell, in which the terminal transmits PUCCH. The other cell is an Scell, in which the terminal does not transmit PUCCH. Measurement signals can be configured in the Scell.

[0439] The terminal can be set / configured from a higher layer using MeasObjectNR IE (Information Element). MeasObjectNRIE includes information for intra-frequency / inter-frequency measurements. This includes ssbFrequency (information about the SSB frequency), ssbFrequencySpacing (information about the SSB subcarrier spacing), and ssb-ToMeasure (information about the time-domain configuration information of the SSB to be measured). smtc1 or smtc2 (information about the SMTC window configuration) is also included in the MeasObjectNR IE.

[0440] The following is a method for determining the K time slots for PUCCH transmission when a terminal is set / configured to repeatedly transmit PUCCH in K time slots: i) If a symbol assigned to PUCCH transmission in a time slot overlaps with a measurement signal (SSB configured in MeasObjectNR) within the SMTC window, the terminal does not include that time slot in the K time slots for PUCCH transmission. ii) If a symbol assigned to PUCCH transmission in a time slot overlaps with a measurement signal (SSB configured in MeasObjectNR) within the SMTC window in the symbol immediately following the measurement signal, the terminal does not include that time slot in the K time slots for PUCCH transmission. iii) If a symbol assigned to PUCCH transmission in a time slot overlaps with a measurement signal (SSB configured in MeasObjectNR) within the SMTC window in the symbol immediately following or immediately preceding the measurement signal, the terminal does not include that time slot in the K time slots for PUCCH transmission. Descriptions i) through iii) apply only when scheduling availability is limited.

[0441] The following describes the method for transmitting PUCCH within an SMTC window after the terminal is set / configured to repeatedly transmit PUCCH in K time slots and the K time slots for PUCCH transmission are determined: i) If a symbol assigned to PUCCH transmission in a time slot overlaps with a measurement signal (SSB configured in MeasObjectNR) and a symbol immediately following the measurement signal within the SMTC window, the terminal does not transmit PUCCH in that time slot. ii) If a symbol assigned to PUCCH transmission in a time slot overlaps with a measurement signal (SSB configured in MeasObjectNR) and a symbol immediately following the measurement signal within the SMTC window, the terminal does not transmit PUCCH in that time slot. iii) If a symbol assigned to PUCCH transmission in a time slot overlaps with a measurement signal (SSB configured in MeasObjectNR) and a symbol immediately following or immediately preceding the measurement signal within the SMTC window, the terminal does not transmit PUCCH in that time slot. Descriptions i) through iii) apply only when scheduling availability is limited.

[0442] This specification describes a method for determining time slots for repeated PUCCH transmissions when the terminal has only half-duplex capability. If the terminal has only half-duplex capability, it cannot perform both transmission and reception simultaneously. That is, when the terminal is transmitting in one cell, it cannot be receiving in another cell. Similarly, when the terminal is receiving in one cell, it cannot be transmitting in another cell. Therefore, the terminal should operate in only one direction—transmission and reception—within a single cell.

[0443] This specification describes a method by which a terminal determines the K time slots for PUCCH transmission when there are measurement signals that the terminal should receive in the Pcell / Scell ​​and the terminal is set / configured to repeatedly transmit PUCCH in the Pcell in K time slots. If the terminal determines the K time slots for transmitting PUCCH in the Pcell without considering the measurement signals that need to be received in the Pcell / Scell, then the terminal should transmit PUCCH in the Pcell and should receive measurement signals in the Pcell / Scell ​​in some time slots. This operation is possible for terminals with full-duplex capability, but the problem arises because this operation is not possible for terminals with only half-duplex capability. Therefore, the terminal should consider the measurement signals in the Pcell / Scell ​​to determine the time slots in which to transmit PUCCH.

[0444] In a method for determining K time slots for repeated PUCCH transmission in a half-duplex terminal, if a symbol assigned to PUCCH transmission in a time slot overlaps with the measurement signal of the Pcell / Scell ​​within the SMTC window, the terminal can exclude that time slot from the K time slots in which PUCCH is to be repeatedly transmitted.

[0445] In a method for determining K time slots for repeated PUCCH transmission in a half-duplex terminal, if a symbol assigned to PUCCH transmission in a time slot overlaps with the measurement signal of the Pcell / Scell ​​and the symbol immediately following the measurement signal within the SMTC window, the terminal can exclude that time slot from the K time slots in which PUCCH is to be repeatedly transmitted.

[0446] In a method for determining K time slots for repeated PUCCH transmission in a half-duplex terminal, if a symbol assigned to PUCCH transmission in a time slot overlaps with a measurement signal of the Pcell / Scell ​​and a symbol immediately following or immediately preceding the measurement signal within the SMTC window, the terminal can exclude that time slot from the K time slots in which PUCCH is to be repeatedly transmitted.

[0447] Measurement signals can include SSBs configured in MeasObjectNR. Measurement signals can also include CSI-RS configured in MeasObjectNR. CSI-RS can be configured via csi-rs-ResourceConfigMobility in the MeasObjectNR IE.

[0448] In 3GPP NR Release 16 Enhanced URLLC (eURLLC), technologies for providing services with high reliability and low latency will be introduced. Specifically, in the uplink case, methods can be implemented to enable terminals to repeatedly transmit the Physical Uplink Shared Channel (PUSCH) to the base station as quickly as possible to reduce latency and improve reliability. Hereinafter, this specification describes methods for terminals to repeatedly transmit the Physical Uplink Data Channel as quickly as possible.

[0449] The terminal receives PUSCH scheduling information from the base station via PDCCH (or DCI). Based on the received scheduling information, the terminal transmits PUSCH in the uplink. The terminal can identify the time-frequency resources in which to transmit PUSCH by using the time-domain assignment information (time-domain resource assignment) and frequency-domain assignment information (frequency-domain resource assignment) included in the DCI for PUSCH transmission. The time resources in which PUSCH is transmitted include consecutive symbols, and a PUSCH cannot be scheduled across time slot boundaries.

[0450] 3GPP NR Release 15 supports repetitive PUSCH transmissions between time slots. First, the terminal can receive the configured number of repetitive transmissions from the base station. For example, the value configured for the terminal is assumed to be K. When the terminal receives a PDCCH (or DCI) for PUSCH scheduling in time slot n and is instructed / configured to transmit PUSCH in time slot n+k, the terminal can transmit PUSCH in K consecutive time slots starting from time slot n+k. That is, the terminal can transmit PUSCH in time slots n+k, n+k+1, ..., n+k+K-1. The time and frequency resources for transmitting PUSCH in each time slot are the same as those indicated / configured via the DCI. In other words, PUSCH can be transmitted in the same symbols and the same PRBs within the time slots. To obtain diversity gain in the frequency domain, frequency hopping can be configured for the terminal. Frequency hopping includes intra-time slot hopping (performing frequency hopping within a time slot) and inter-time slot hopping (performing frequency hopping for each time slot). If intra-slot frequency hopping is configured for the terminal, the terminal splits the PUSCH in the time domain in each time slot, then transmits one half in the scheduled PRB and the other half in a PRB obtained by adding an offset value to the scheduled PRB. Here, for the offset value, two or four values ​​can be configured via a higher layer, and one of these values ​​can be indicated via DCI. If inter-slot frequency hopping is configured for the terminal, the terminal transmits the PUSCH in the scheduled PRB in odd-numbered time slots in which it transmits the PUSCH, and transmits the PUSCH in the PRB obtained by adding an offset value to the scheduled PRB in even-numbered time slots. When the terminal performs repetitive transmissions in a time slot, if a symbol that should be transmitted in a particular time slot is configured via semi-static DL symbols, the terminal does not transmit the PUSCH in that time slot. The PUSCH that fails to be transmitted is deferred to another time slot and is not transmitted.

[0451] The repetitive transmissions described in version 15 are unsuitable for providing eURLLC services. This is because there are two main problems: i) difficulty in providing high reliability, and ii) long latency. Specifically, if a time slot includes 14 symbols and PUSCH is transmitted in symbols 12 and 13, then PUSCH should also be repeatedly transmitted in symbols 12 and 13 in subsequent time slots. Therefore, although PUSCH transmission is possible in symbols 1 to 11 of subsequent time slots, it is not performed, and thus high reliability is difficult to achieve. Furthermore, assuming a time slot includes 14 symbols and PUSCH is transmitted in symbols 0 to 13 to achieve high reliability, the last symbol of the PUSCH, i.e., symbol 13, should be received for the base station to successfully receive the PUSCH. Therefore, there is a problem that the latency becomes longer depending on the length of the PUSCH.

[0452] To address this issue, this specification describes a method for repeatedly transmitting PUSCH within a time slot. Specifically, the terminal may transmit scheduled PUSCH continuously and repeatedly. Continuously means retransmitting PUSCH starting from the symbol immediately following the end of a PUSCH. This can be described as micro-timeslot-level PUSCH repetition, and the aforementioned 3GPP NR Release 15 retransmission method can be described as timeslot-level PUSCH repetition.

[0453] The aforementioned problems can be solved by applying a micro-slot-level PUSCH repetition method. Specifically, i) high reliability can be provided. For example, if a time slot includes 14 symbols and PUSCH is transmitted in symbols 12 and 13, PUSCH can be repeatedly transmitted in symbols 1 and 2 of subsequent time slots. Therefore, high reliability can be achieved because PUSCH is transmitted directly and continuously. Additionally, ii) delay time can be reduced. For example, suppose a time slot includes 14 symbols, and PUSCH is transmitted in symbols 0 to 1 for high reliability. Since PUSCH is repeatedly transmitted in the time slot, PUSCH can be transmitted in symbols 2-3 and can be repeatedly transmitted in symbols 4-5. Therefore, reliability similar to that of PUSCH transmission with a time slot length of 14 can be obtained. However, in this case, the base station can achieve successful reception not only when receiving all repeated transmissions according to channel conditions, but also in the middle of repeated transmissions. Therefore, after symbol 2, where the first repeated transmission ends, the terminal can successfully receive PUSCH depending on the conditions, thus reducing delay time.

[0454] The following describes the case of repeatedly transmitting micro-slot-level PUSCH repetitions across time slots in another time slot. As mentioned above, in micro-slot-level PUSCH repetitions, subsequent repetitions of PUSCHs begin with the symbol immediately following the end of a PUSCH transmission. However, continuous transmission may not be possible in the following situations.

[0455] i) First, when a repeated PUSCH transmission is performed from a symbol immediately following the end of the first PUSCH transmission, the symbol used for the PUSCH transmission overlaps with the semi-static DL symbol. In this case, due to the overlap with the semi-static DL symbol, PUSCH cannot be sent from the immediately following symbol. Therefore, PUSCH can be repeatedly sent in another symbol.

[0456] ii) Next, when a repeated PUSCH transmission is performed from the symbol immediately following the end of the first PUSCH transmission, the repeatedly transmitted PUSCH crosses a slot boundary. Since a PUSCH is not allowed to cross a slot boundary, the PUSCH can be transmitted via another symbol.

[0457] In this specification, the method of repeated PUSCH transmission taking into account situations i) and ii) will be described.

[0458] Figure 18 The illustration shows a repeated micro-slot-level PUSCH transmission according to an embodiment of the present disclosure.

[0459] If the terminal is configured to perform micro-slot-level PUSCH repetition, the terminal transmits the PUSCH in the symbol immediately following a PUSCH transmission. If a PUSCH cannot be transmitted (as described above, in cases of overlap with a semi-static DL symbol or crossing a slot boundary), the terminal may transmit the PUSCH in the earliest symbol available for transmission. Here, the earliest symbol available for transmission refers to the case where the PUSCH does not overlap with a semi-static DL symbol and does not cross a slot boundary. (See reference...) Figure 18 The terminal can be configured to repeatedly perform transmissions four times per micro-slot level PUSCH, and can be configured / instructed to send PUSCH via four symbols starting from the fifth symbol of the slot, according to the PDCCH (or DCI). Figure 18 In this context, D, U, and F refer to the downlink symbol, uplink symbol, and flexible symbol in the semi-static DL / UL configuration. The terminal can transmit the first PUSCH in time slot symbols 5 through 8 and can determine whether a second PUSCH can be transmitted in symbols 9 through 12 immediately following the repeated PUSCH transmission period. If transmission is possible (i.e., if the PUSCH does not overlap with the semi-static DL symbol and does not cross time slot boundaries), the terminal can transmit the second PUSCH in symbols 9 through 12. In this case, the PUSCH starting in symbol 13, which is the subsequent symbol to the last symbol in which the second PUSCH is transmitted (symbol 12), crosses a time slot boundary and overlaps with the semi-static DL symbol, so a third PUSCH transmission cannot be performed. The subsequent transmittable symbols are symbols 3 through 6 in the following time slots, and since these symbols are flexible symbols, PUSCH transmission is possible. Therefore, a third repeated PUSCH transmission is performed in the corresponding symbols. Subsequently, a fourth repeated PUSCH transmission is performed in symbols 7 through 10. Since the terminal has completed four repeated transmissions, no further repeated transmissions are performed.

[0460] Figure 19 The illustration shows a repeating micro-slot-level PUSCH transmission according to another embodiment of this disclosure.

[0461] If the terminal is configured / instructed to perform micro-slot-level PUSCH repetition, the terminal transmits the PUSCH in the symbol immediately following a PUSCH transmission. If a PUSCH cannot be transmitted (if it overlaps with a semi-static DL symbol or X flexible symbols immediately following a semi-static DL symbol, or crosses a slot boundary), the terminal may transmit the PUSCH in the earliest symbol available for transmission. Here, the earliest symbol available for transmission is the symbol in which the PUSCH does not overlap with a semi-static DL symbol, does not overlap with X flexible symbols immediately following a semi-static DL symbol, and does not cross a slot boundary. (See reference) Figure 19 Assume that the terminal can be configured to repeatedly perform transmissions 4 times at the micro-slot level PUSCH, and can be instructed by the PDCCH (or DCI) to send PUSCH via 4 symbols starting from the fifth symbol of the slot. Figure 19 D, U, and F refer to the downlink symbol, uplink symbol, and flexible symbol in a semi-static DL / UL configuration. According to Figure 19 The terminal can transmit a PUSCH in symbols 5 to 8 of the first time slot and can determine whether a PUSCH can be transmitted in symbols 9 to 12, which are immediately following the repeated PUSCH transmission period. If transmission is possible (that is, if the PUSCH does not overlap with the semi-static DL symbol, does not overlap with the X flexible symbols immediately following the semi-static DL symbol, and does not cross a time slot boundary), the terminal can perform a second repeated PUSCH transmission in symbols 9 to 12. The duration of the third PUSCH transmission, starting from the subsequent symbol 13, crosses a time slot boundary and overlaps with the semi-static DL symbol, making it impossible to transmit the third PUSCH. Figure 19 (a) is the case where X = 1 and Figure 19 (b) represents the case where X = 2. (See reference) Figure 19 In (a), the subsequent duration for which PUSCH can be transmitted is symbols 4 through 7 of the subsequent time slot. These symbols are flexible symbols, and therefore transmission is possible. Therefore, a third repeated PUSCH transmission is performed in the corresponding symbols. A fourth repeated PUSCH transmission is performed in symbols 8 through 11. Since the terminal has completed 4 repeated transmissions, no further repeated transmissions are performed. (See reference...) Figure 19 (b) wherein the subsequent duration for which PUSCH can be transmitted is symbols 5 through 8 of the subsequent time slot. These symbols are flexible symbols or semi-static UL symbols, and therefore transmission is possible. Therefore, a third repeated PUSCH transmission is performed in the corresponding symbols. A fourth repeated PUSCH transmission is performed in symbols 9 through 12. Since the terminal has completed 4 repeated transmissions, no further repeated transmissions are performed.

[0462] If an SS / PBCH block is configured for repeated PUSCH transmission in a cell, or if an SS / PBCH block for measurement is configured in another cell and measurement needs to be performed, the terminal processes the symbols corresponding to the SS / PBCH block in the same way as semi-static DL symbols. For example, as described above, in addition to cases where PUSCH cannot be transmitted, cases where it overlaps with a semi-static DL symbol or X flexible symbols immediately following a semi-static DL symbol, or crosses a slot boundary, may also include symbols overlapping with an SS / PBCH block and X flexible symbols immediately following a symbol overlapping with an SS / PBCH block.

[0463] A terminal configured to repeatedly send PUSCH K times can postpone the PUSCH until a symbol available for transmission is found before the PUSCH is sent K times. However, postponing the PUSCH for too long does not satisfy the purpose of micro-timeslot-level PUSCH repetition. Micro-timeslot-level PUSCH repetition is a method used to support uplink URLLC services, and if the PUSCH is postponed for too long, this does not meet the requirements of URLLC services. In addition, the operation of PUSCH transmission caused by postponing the PUSCH for too long prevents the base station from using the corresponding resources for other terminals, resulting in a waste of network resources. Therefore, the conditions for terminating repeated transmission in micro-timeslot-level PUSCH repetition will be described in this specification.

[0464] Figure 20 This is a diagram illustrating the conditions for the termination of repeated micro-slot-level PUSCH transmission according to an embodiment of the present disclosure.

[0465] i) If a new PUSCH with the same HARQ procedure number (HPN) as the repeatedly sent PUSCH is scheduled, the terminal can stop the previous PUSCH repetition. Specifically, refer to... Figure 20 (a) The scheduling information for scheduling recurring PUSCHs includes HPN = . If another PDCCH (or DCI) (DCI format 0_0 or 0_1) used for scheduling PUSCHs has the same HPN as HPN (HPN = i), or if a New Data Indicator (NDI) is additionally switched, then recurring PUSCH transmissions may not be performed after the PDCCH. Receiving a PDCCH and canceling a PUSCH requires processing time, such that PUSCHs before a predetermined time after the last symbol of the PDCCH may not be canceled, while PUSCHs only after the predetermined time may be canceled.

[0466] ii) If another PUSCH is scheduled within the same symbol of a repeatedly transmitted PUSCH, the terminal may not perform the repeated transmission of the PUSCH. (See reference) Figure 20(b) If the PDCCH is scheduled to overlap with a previously scheduled PUSCH in the time domain, the repeated transmission of the PUSCH can be terminated.

[0467] iii) If the terminal receives an explicit HARQ-ACK for a repeatedly transmitted PUSCH, the terminal may stop performing the repeated transmission. An explicit HARQ-ACK is information provided by the base station to the terminal via a separate channel to indicate whether the PUSCH transmission was successfully performed.

[0468] iv) The terminal may stop sending PUSCH after a predetermined time. For example, if the URLLC service via which it sends PUSCH requires transmission to be completed within 1 ms, the terminal may stop sending PUSCH after 1 ms. The predetermined time can be an absolute time, such as 1 ms, or it can be determined based on time slots, such as two time slots. The predetermined time is a configurable value by the base station.

[0469] A terminal configured to repeatedly send PUSCH K times can count the number of times PUSCH is repeatedly sent K times. Normally, the terminal only increments the number of repeatedly sent PUSCHs when a PUSCH is actually sent. However, as mentioned above, sending PUSCH K times may result in excessive delays. To address this issue, a counting rule will be described in this specification.

[0470] Figure 21 This is a diagram illustrating the counting rules for repeated micro-slot-level PUSCH transmissions according to an embodiment of the present disclosure.

[0471] i) When a PUSCH is actually transmitted, the terminal counts the number of PUSCHs. If a PUSCH cannot be transmitted within Y symbols, the terminal performs a count. If the count exceeds the number of PUSCH repetitions K, no more PUSCHs are transmitted. Here, Y symbols can refer to the number of symbols allocated to the PUSCH. Y symbols can be the number of symbols included in a time slot. Y symbols can correspond to a value set / configured from a higher layer.

[0472] Figure 21 (a) shows the number of repeated PUSCH transmissions obtained according to (i). Reference Figure 21In case (a), assume the terminal is configured / instructed to repeatedly send (K=4) PUSCH 4 times, and Y=5 is configured. The terminal fails to perform repeated PUSCH transmissions in the last symbol of the first time slot and the first 4 symbols of the second time slot, but fails to perform transmissions for Y=5 symbols (from the last symbol of the first time slot to the fourth symbol of the second time slot), therefore the terminal needs to count the number of PUSCHs. The final fourth repeated PUSCH transmission can be performed in symbols 4, 5, 6, and 7 of the second time slot.

[0473] ii) When a PUSCH is actually transmitted, the terminal counts the number of PUSCHs. If no repeated PUSCH transmission is performed even once in slot Z, the number of PUSCHs is counted. If the counted number of PUSCHs exceeds the number of PUSCH repetitions K, no more PUSCHs are transmitted. Here, slot Z can correspond to slot 1. Slot Z can correspond to a value configured from a higher layer.

[0474] Figure 21 (b) shows the number of repeated PUSCH transmissions obtained according to (ii). It is assumed that the terminal is configured / instructed to repeatedly send (K=4) PUSCH 4 times, and Z=1 is set / configured. Even if the terminal is in the second time slot ( Figure 21 In the attached figure, reference numeral 3) indicates that a repeated PUSCH transmission has not yet been performed, and the number of PUSCHs is also counted because the terminal failed to perform a PUSCH transmission during one time slot. A final fourth repeated PUSCH transmission can be performed in symbols 10, 11, 12, and 13 of the third time slot.

[0475] Referring to 3GPP standard documents, PUSCHs used by terminals to transmit uplink data cannot cross slot boundaries. That is, the start and end symbols of a scheduled PUSCH should always be located in the same slot. (In the case of repeated PUSCH transmissions, the start and end symbols can be located in different slots, but general PUSCH transmissions excluding repeated transmissions will be described in this document.) Specifically, the base station can inform the terminal about the symbols in which PUSCH transmissions are possible via a Start and Length Indication Value (SLIV). The SLIV can indicate the position of the start symbol in the slot (expressed as S and can have one of the values ​​0, 1, 2, ..., 13) and the length (expressed as L and can have one of the values ​​1, 2, ..., 14). In other words, the SLIV value has one of S+L = 1, 2, ..., 14. If a combination of S+L > 14 is used, the start and end symbols cannot be located in the same slot. For example, if S=5 and L=10, the transmission starts from the sixth symbol of the time slot and has a length of 10 symbols, making one symbol the first symbol of the subsequent time slot. Therefore, the start and end symbols are located in different time slots, which is inappropriate. SLIV can be obtained based on the following Equation 3.

[0476] [Equation 3]

[0477] If (L-1)≤7, then

[0478] SLIV = 14·(L-1) + S

[0479] otherwise

[0480] SLIV = 14·(14-L+1)+(14-1-S)

[0481] Where 0 < L ≤ 14 - S, and

[0482] To provide URLLC service, the base station needs to assign resources to terminals so that PUSCH transmission can begin as quickly as possible. A sufficient number of symbols are required to ensure reliability. However, since PUSCH cannot be scheduled outside of slot boundaries, if the number of symbols available for uplink transmission in the current slot is insufficient, PUSCH transmission should be scheduled in a subsequent slot. This is unsuitable for URLLC service due to the time delay before transmission in a subsequent slot. To address this issue, this specification describes a SLIV design approach for scheduling outside of slot boundaries.

[0483] When a terminal receives an SLIV value beyond the slot boundary (i.e., S+L>14), it cannot transmit a PUSCH that crosses the slot boundary. Therefore, the terminal can transmit a first PUSCH within the symbols included before the slot boundary and a second PUSCH within the symbols included after the slot boundary. Specifically, a first PUSCH of length L1 = 13 - S+1 is transmitted during the duration from symbol S to symbol 13 (the last symbol) before the slot boundary, and a second PUSCH of length L2 is transmitted during the duration from symbol 0 to symbol L2-1 after the slot boundary. Here, L2 = L - L1. The first and second PUSCHs can correspond to repeated transmissions of the same transport block (TB). If a symbol is unavailable for uplink transmission, the terminal can transmit the first and second PUSCHs in symbols other than those symbols. In this case, symbols that cannot be used for uplink transmission may include the DL symbol determined according to the semi-static DL / UL assignment, P flexible symbols immediately following the DL symbol, the symbol corresponding to the SS / PBCH block, and P flexible symbols immediately following the symbol corresponding to the SS / PBCH block. P can have a value of 1 or 2.

[0484] Figure 22 This is a diagram illustrating PUSCH transmission taking into account time slot boundaries according to an embodiment of the present disclosure.

[0485] refer to Figure 22 In (a), when the starting symbol is symbol 6(S) and a PUSCH of length 14 is scheduled, a first PUSCH of length 8 can be sent from symbols 6 to 13 in the first time slot, and a second PUSCH of length 6 can be sent from symbols 0 to 5 in the second time slot. (See reference) Figure 22 (b) If the first two symbols of the second time slot are symbols in which uplink transmission cannot be performed, the terminal may not send a PUSCH in those two symbols. Therefore, the second PUSCH can be sent via the four symbols starting from the third symbol of the second time slot.

[0486] As in Figure 22 As in (b), if there are symbols that cannot be used for uplink transmission, the length of the PUSCH is reduced. To prevent this, when the symbols used for PUSCH transmission overlap with symbols in which uplink transmission is impossible, the PUSCH can be sent by postponing transmission to a symbol in which uplink transmission is possible, following the symbol in which uplink transmission is impossible. For example, see reference... Figure 22(c) If the first two symbols of the second time slot are symbols in which uplink transmission cannot be performed, the terminal can send the second PUSCH via the six symbols following these two symbols in which uplink transmission is possible. In this case, the transmission of the PUSCH can be delayed for a while, but the number of symbols assigned to the PUSCH can be maintained, and thus the degradation of the PUSCH reception performance can be prevented.

[0487] The SLIV design methodology will be described below in this specification.

[0488] SLIV can be designed to meet the following conditions.

[0489] The position (S) of the starting symbol can be one of 0, 1, ..., 13, and the length (L) of the entire PUSCH can be one of 1, 2, ..., 14. The value of S+L can be any value from 1 to 27 without any separate restriction. A SLIV that satisfies this condition can be calculated as follows.

[0490] SLIV = S + 14 * (L - 1) or

[0491] SLIV = L-1 + 14*S

[0492] When using SLIV = S + 14 * (L - 1) as the equation for calculating SLIV, S can be obtained by adding 1 to the remainder of SLIV divided by 14 (S = SLIV mod 14), and L can be obtained by adding 1 to the quotient obtained by dividing SLIV by 14 (L = floor(SLIV / 14) + 1). When using SLIV = L - 1 + 14 * S as the equation for calculating SLIV, L can be obtained by adding 1 to the remainder of SLIV divided by 14 (L = (SLIV mod 14) + 1), and S can be obtained by adding 1 to the quotient obtained by dividing SLIV by 14 (S = floor(SLIV / 14)).

[0493] When SLIV is determined using the method described above, the terminal can perform scheduling beyond the slot boundaries. However, when PUSCH transmissions are scheduled in this way, scheduling may not be performed up to the last symbol of the second slot (based on slot boundaries, the preceding side is referred to as the first slot and the following side as the second slot). This presents an inefficiency in terms of frequency utilization, as only some symbols are used despite their availability in the second slot. Methods for addressing these issues will be described below in this specification.

[0494] The position (S) of the starting symbol can be one of 0, 1, ..., 13, and the length (L) of the entire PUSCH can be one of 1, 2, ..., 28. The value of S+L should be less than or equal to 28. For reference, it is possible up to L=28 in this case, but since the PUSCH transmitted according to the SLIV is divided at the slot boundary, the length of a PUSCH is equal to or less than 14 symbols. The equation used to obtain the SLIV that satisfies this condition is shown in Equation 4.

[0495] [Equation 4]

[0496] If (L-1)≤7+14, then

[0497] SLIV = 14 * (L-1) + S

[0498] otherwise

[0499] SLIV=14*14+14*(28-L+1)+(14-1-S)

[0500] Where 0 < L ≤ 28-S

[0501] Generally speaking, the position (S) of the starting symbol can be one of 0, 1, ..., B, and the length (L) of the entire PUSCH can be one of 1, 2, ..., A. The value of S+L should be less than or equal to A. The equation used to obtain the SLIV that satisfies this condition is the same as Equation 5.

[0502] [Equation 5]

[0503] If (L-1)-floor((A-(B+1)) / 2)≤floor(A / 2), then

[0504] SLIV = (B+1)*(L-1)+S

[0505] otherwise

[0506] SLIV = (B+1)*(A-L+AB)+(BS)

[0507] Where 0 < L ≤ AS

[0508] If A = 14 and B = 13, then the equation is the same as Equation 3; and if A = 28 and B = 13, then the equation is the same as Equation 4. A can be determined as the number of symbols included in a time slot. For example, if the number of symbols included in a time slot is 14, then A = 14, 28, 42, etc. B can be determined as the value obtained by subtracting 1 from a multiple of the number of symbols included in a symbol. For example, if the number of symbols included in a time slot is 14, then B = 13, 27, 41, etc.

[0509] The SLIV value that crosses the slot boundary can be obtained by multiplying the length of the SLIV value in Equation 3 by an integer. The position of the start symbol (S) can be one of 0, 1, ..., 13, and the length of the entire PUSCH (L) can be one of 2, 4, 6, ..., 28. The value of S+L should be less than or equal to 28. The equation used to obtain the SLIV that satisfies this condition is shown in Equation 6. Here, L = 2*X can be obtained, where X can be one of 1, 2, 3, ..., 14. This method doubles the length obtained from Equation 3, thereby enabling scheduling beyond the slot boundary. In general, L = A*X can be obtained, where A is determined to be one of two or more natural numbers.

[0510] [Equation 6]

[0511] If (X-1)≤7, then

[0512] SLIV = 14 * (X - 1) + S

[0513] otherwise

[0514] SLIV = 14 * (14 - X + 1) + (14 - 1 - S)

[0515] Where 0 < X ​​≤ 14-S

[0516] When using Equation 6, not only is the SLIV interpretation scheme similar to that of Equation 3, but SLIV is expressed using the same number of bits, which is advantageous in terms of overhead.

[0517] According to Equation 3, the total number of possible values ​​for SLIV is 14 * 15 / 2 = 105, which can be represented by 7 bits. Since 7 bits can represent 0, 1, ..., 127, the remaining 23 values ​​(127-105) according to Equation 3 are not used. In this case, the base station can perform scheduling beyond the time slot boundaries by using the 23 unused values ​​of SLIV. Specifically, when SLIV is one of the 23 unused values, the values ​​of the start symbol position (S) and length (L) can be predetermined. For example, if SLIV is one of the 23 values, it can be determined that S = 7 and L = 14. The values ​​of S and L can be configured / indicated via higher layers.

[0518] The following description provides a repetitive PUSCH transmission scheme in which micro-slot-level PUSCH repetition and multi-segment transmission schemes are combined.

[0519] Figures 23 to 26 This is a diagram illustrating repeated PUSCH transmission considering multi-segment transmission and repeated micro-slot-level PUSCH transmission according to an embodiment of the present disclosure.

[0520] i) Reference Figure 23 The base station sends time-domain resource assignment information (S: start symbol index, L: length) for the first repeated PUSCH transmission to the terminal. Then, it sends the repetition count (K). The terminal uses the received information to determine the symbols in which the repeated PUSCH transmission will be performed. In this case, subsequent repeated PUSCH transmissions are performed consecutively in the symbols immediately following the symbol in which the first repeated PUSCH transmission was performed. If a repeated PUSCH transmission crosses a time slot boundary, the repeated PUSCH transmission can be partitioned based on the time slot boundary. If a repeated PUSCH transmission overlaps with a DL symbol configured in an SS / PBCH block or a semi-static UL / DL configuration, the repeated PUSCH transmission can be performed in the symbols that do not overlap with the DL symbol. The terminal can exclude flexible symbols immediately following the DL symbol configured in the semi-static UL / DL configuration from the repeated PUSCH transmission. (Reference) Figure 23 When the index of the starting symbol in which the first repeated PUSCH transmission is performed is configured to be 4, the length is 4, and the number of repeated transmissions is 5, the third repeated PUSCH transmission is divided based on the time slot boundary because it crosses the time slot boundary. This method can cause the following disadvantage: when dividing repeated PUSCH transmissions at the time slot boundary, the number of symbols included in a single repeated PUSCH transmission is too small. To solve this problem, if the repeated PUSCH transmission is configured with only one symbol, the terminal may not perform the repeated PUSCH transmission. This is because if the repeated PUSCH transmission is configured with only one symbol, data other than DM-RS cannot be sent in the corresponding symbol. If the number of symbols in which the repeated PUSCH transmission is performed is equal to or less than the number of DM-RS symbols required to send via the repeated PUSCH transmission, the terminal may not perform the repeated PUSCH transmission.

[0521] ii) Reference Figure 24 The base station sends time-domain resource allocation information (S: start symbol index, L: length) for PUSCH transmission to the terminal. Then, it sends the repetition count (K). The base station determines whether L*K symbols starting from the start symbol corresponding to S have crossed the time slot boundary. If the time slot boundary has not been crossed, the first repetition PUSCH transmission is configured with L symbols starting from the start symbol, and K-1 subsequent repetition PUSCH transmissions can begin consecutively from the symbol immediately following the symbol in which the first repetition PUSCH transmission was performed, and can be configured with L symbols. If the time slot boundary has been crossed, the terminal can divide the repetition PUSCH transmission into L*K symbols based on the time slot boundary. (See reference) Figure 24When the index of the starting symbol of a given PUSCH is 4, the length is 4, and the number of retransmissions is 5, the terminal can divide the time slot into 20 symbols based on the time slot boundary because the 20 symbols starting from the symbol corresponding to index 4 cross the time slot boundary. Therefore, in Figure 24 In this case, two repeated PUSCH transfers can be performed.

[0522] iii) Reference Figure 25 The base station sends time-domain resource assignment information (S: start symbol index, L: length) for the first repeated PUSCH transmission to the terminal. Then, it sends the repetition count (K). The terminal determines, via the received information, the symbols in which the repeated PUSCH transmission will be performed. Subsequent repeated PUSCH transmissions are performed consecutively in the symbols immediately following the symbols in which the first repeated PUSCH transmission was performed. In this case, if a repeated PUSCH transmission crosses a time slot boundary, the terminal does not perform a repeated PUSCH transmission. If a repeated PUSCH transmission overlaps with an SS / PBCH block or a symbol configured for DL ​​in a semi-static UL / DL configuration, the terminal may not perform a repeated PUSCH transmission. For example, in... Figure 25 In this case, the third repeating PUSCH transmission should be performed in symbols 12 and 13 of the first time slot and in symbols 0 and 1 of the second time slot, but this crosses the time slot boundary and therefore no transmission is performed.

[0523] iv) Reference Figure 26 The base station sends time-domain resource assignment information (S: start symbol index, L: length) to the terminal for the first repeated PUSCH transmission. Then, it sends the repetition count (K). The terminal determines, based on the received information, the symbols in which the repeated PUSCH transmission will be performed. Subsequent repeated PUSCH transmissions are performed consecutively in the symbols immediately following the symbols in which the first repeated PUSCH transmission is performed. If a symbol assigned to a repeated PUSCH transmission crosses a time slot boundary, the terminal can partition the symbols assigned to the repeated PUSCH transmission based on the time slot boundary and can include the partitioned symbols in adjacent repeated PUSCH transmissions within the same time slot. If there are no adjacent repeated PUSCH transmissions in the same time slot, the terminal can use these symbols to perform the repeated PUSCH transmission. For example, assigned to... Figure 26 The symbols of the third repeated PUSCH transmission (symbols 12 and 13 of the first time slot and symbols 0 and 1 of the second time slot) span the time slot boundary. Therefore, partitioning can be performed in units of two symbols (symbols 12 and 13 and symbols 0 and 1) according to the time slot boundary, with the first two symbols being included in the preceding repeated PUSCH transmission and the latter two symbols being included in the subsequent repeated PUSCH transmission.

[0524] Figure 27 This is a diagram illustrating repeated PUSCH transmissions according to an embodiment of the present disclosure.

[0525] refer to Figure 27 The base station can additionally send information to the terminal about symbols that cannot be used for repeated PUSCH transmission. The terminal can perform repeated PUSCH transmission using the aforementioned transmission methods i) to iv), wherein if a symbol that cannot be used for repeated PUSCH transmission overlaps with a symbol that has been allocated for repeated PUSCH transmission, the symbol that cannot be used for repeated PUSCH transmission can be excluded from the repeated PUSCH transmission. If a symbol that cannot be used for repeated PUSCH transmission overlaps with a symbol that has been allocated for repeated PUSCH transmission, the terminal may not perform repeated PUSCH transmission. Information about symbols that cannot be used for repeated PUSCH transmission can be configured to the terminal via RRC signals. Symbols that cannot be used for repeated PUSCH transmission can be configured to the terminal via RRC signals, and it can be indicated which of the configured symbols that cannot be used for repeated PUSCH transmission cannot actually be used for repeated PUSCH transmission. When the base station configures symbols that cannot be used for repeated PUSCH transmission to the terminal via the Time Domain Resource Assignment (TDRA) table, the configuration can be performed differently for each entry in each table. The terminal can be configured / indicated to have an entry in the TDRA table configured via DCI, and can perform repeated PUSCH transmissions based on symbols configured in that entry that are not available for repeated PUSCH transmissions.

[0526] The method for obtaining the transport block (TB) size when performing repeated pusch transfers will be described below in this specification. According to 3GPP standard documents, the TB size can be proportional to the number of REs allocated to the pusch. That is, a pusch assigned more REs can have a larger TB size. However, as mentioned above, the number of REs available for each repeated pusch transfer may differ. For example, the first repeated pusch transfer may use 2 symbols, while the second repeated pusch transfer may use 10 symbols. In this case, it is necessary to determine which number of REs will be used to determine the TB size.

[0527] First, the method aims to determine the size of the TB (Block Byte) to enable decoding (decodeability) of the first PUSCH. The reason for using repeated PUSCH transmissions is to reduce latency through fast decoding success. Therefore, it is important that the first PUSCH is transmitted in a decodeable manner. Thus, the terminal can determine the size of the TB based on the number of REs used for the first PUSCH. The terminal can determine the size of the TB based on the minimum number of REs corresponding to a repeated PUSCH transmission with a Redundancy Version (RV) value of 0. However, when determining the size of the TB based on the number of REs used for the first PUSCH, the optimal TB size cannot be determined because the number of REs used by another PUSCH is not considered. For example, if the number of REs used for the first PUSCH transmission is greater than the number of REs used for the second PUSCH transmission, and the TB size is determined based on the number of REs used for the first PUSCH transmission, the bit rate may increase due to the fewer REs used for the second PUSCH transmission, potentially causing performance degradation.

[0528] Therefore, if the number of REs used for the first repeated PUSCH transmission is less than the average number of REs used for all repeated PUSCH transmissions (i.e., the value obtained by dividing the number of REs used for all repeated PUSCH transmissions by the number of repetitions), then the size of the TB is determined based on the number of REs used for the first repeated PUSCH transmission; otherwise, the size of the TB is determined based on the average number of REs used for all repeated transmissions. In other words, if the size of the TB determined based on the number of REs used for the first repeated PUSCH transmission is less than the average TB size determined based on the number of REs used for all repeated transmissions (i.e., the value obtained by dividing the sum of the TB sizes determined based on the number of REs used for the respective repeated PUSCH transmissions by the number of repetitions), then the size of the TB is determined based on the number of REs used for the first repeated PUSCH transmission; otherwise, the size of the TB is determined by the average TB size based on the number of REs used for all repeated transmissions.

[0529] The following section, which is part of this specification, describes a method for interpreting scheduling information from PDSCH or PUSCH.

[0530] The base station can configure a set (or table) of possible PUSCH time-domain assignment information via RRC signals to indicate the time-domain and frequency-domain assignment information of PUSCH to the terminal, and can indicate one time-domain assignment information in the configured set (or table) via DCI for PUSCH scheduling. To configure the set (or table) of PUSCH time-domain assignment information, the base station can indicate the relative PUSCH start symbol index (S) to the terminal via RRC signals using SLIV as shown in Equation 7 below. start′) and the length of PUSCH (L symbols ).

[0531] [Equation 7]

[0532] If L symbols -1≤floor(N symbols / 2) then

[0533] SLIV=N symbols (L symbols -1)+S start ′

[0534] otherwise

[0535] SLIV=N symbols (N symbols -L symbols +1)+(N symbols -1-S start ′)

[0536] Where L symbols >=1 and should not exceed N symbols -S start ′.

[0537] In this case, N symbols It is the number of symbols included in the time slot and is 14.

[0538] The terminal can obtain the relative PUSCH based on the SLIV value calculated using Equation 7.

[0539] Start symbol index (S) start ′) From S start =S start '+R obtains the index (S) of the start symbol that has actually been assigned to PUSCH. start Here, R is the PUSCH start symbol index (S). start The reference symbol index value of ′). S start The value is the index of the symbol at the start of the PUSCH transmission in a time slot, and if N is included in a time slot... symbols With OFDM symbols, there can be {0, 1, ..., N} symbols A value within the range of -1.

[0540] The method for determining the R value will be described below in this specification.

[0541] The terminal can always assume R = 0. That is, the index of the reference symbol can always be fixed to the first symbol of the time slot. This is a method in which the first symbol during the symbol duration in which the PUSCH is actually transmitted is the symbol corresponding to the symbol index indicated by SLIV.

[0542] Equation 8 can be used to calculate SLIV.

[0543] [Equation 8]

[0544] ●If L+S≤14, then

[0545] ●If (L-1)≤7

[0546] ■SLIV=14*(L-1)+S,

[0547] ●Otherwise

[0548] ■SLIV=14*(14-L+1)+(14-1-S)

[0549] ●If L+S>14, then

[0550] ●If (L-1)≤6

[0551] ■SLIV=14*(14-L+1)+(14-1-S)

[0552] ●Otherwise

[0553] ■SLIV=14*(L-1)+S

[0554] S indicates the starting symbol of the PUSCH in the time slot and has a value of 0, 1, 2, ..., 13, while L is the number of symbols occupied by the PUSCH. If the PUSCH is configured to be transmitted repeatedly, then L is the length of the first repeated transmission of the PUSCH. If L+S is less than or equal to 14 (in which case the PUSCH is located in one time slot), then L+S has the same value as SLIV in version 15, while if L+S is greater than 14 (in which case the PUSCH is located across two time slots), then a value other than SLIV in version 15 is used. Therefore, SLIV values ​​can be defined for all combinations of S = 0, 1, ..., 13 and L = 1, 2, ..., 14. The terminal can determine the S and L values ​​based on the SLIV values. The SLIV values ​​of Equation 8 are shown in Table 5 below. In Table 5 below, the horizontal axis is S = 0, 1, ..., 13, and the vertical axis is L = 1, 2, ..., 14. The values ​​in the table are SLIV values.

[0555] [Table 5]

[0556]

[0557] The terminal can determine the R value based on the semi-static DL / UL configuration. The semi-static DL / UL configuration indicates to the terminal via cell-specific RRC signals and UE-specific RRC signals whether each symbol in a time slot is used for downlink transmission (DL symbol) or uplink transmission (UL symbol). Symbols not indicated as DL or UL symbols are flexible symbols. Gap for DL / UL handover for the terminal can be located within flexible symbols. When the flexible symbol index immediately following the DL symbol in a time slot allocated for PUSCH is represented as X, the terminal can assume the reference symbol index (R) of the PUSCH is X. That is, the terminal can assume the flexible symbol immediately following the DL symbol in the time slot is the reference symbol index. When the flexible symbol index immediately following the DL symbol in a time slot allocated for PUSCH is represented as X, the terminal can assume the reference symbol index (R) of the PUSCH is X+Y. Y can be a value indicating the number of symbols used for gaps in DL and UL transmission. The number of symbols Y used for the gap can be obtained via the timing advance (TA) value and the OFDM symbol length, or it can be set / configured by the base station for the terminal. The value of Y can be 1 or 2.

[0558] The terminal can determine the R value based on the CORESET in which it receives the PDCCH. Specifically, the terminal can obtain the R value based on the index of the OFDM symbol in which the CORESET of the DCI for PUSCH scheduling, which has been received from the base station, is located. Since the CORESET is a downlink signal, PUSCH cannot be scheduled for the symbol corresponding to the CORESET. Furthermore, PUSCH transmission scheduling cannot be performed before the CORESET. Therefore, the earliest symbol for which the terminal can be scheduled to transmit PUSCH is the symbol immediately following the CORESET. Therefore, the index of the symbol immediately following the CORESET can be used as a reference symbol index for determining the starting symbol of the PUSCH. For example, if the index of the OFDM symbol starting with the CORESET of the DCI for PUSCH transmission scheduling is K and the length of the CORESET is D, the terminal can obtain the reference symbol index R via K+D. As another example, in order to transmit PUSCH immediately after receiving the CORESET, the terminal needs a gap for the Rx to Tx handover. Therefore, the gap can be taken into account when determining the reference symbol index. For example, if the index of the OFDM symbol starting at the core of the DCI scheduled for PUSCH transmission is K and the length of the core is D, the terminal can obtain the reference symbol index R via K+D+Y. Y is the number of gap symbols and can be 1 or 2. When the base station configures / instructs the terminal to transmit PUSCH using a time slot in which the PDCCH scheduled for PUSCH is received, the terminal can determine the reference symbol index using the aforementioned method. However, if the base station configures / instructs the terminal to transmit PUSCH using a time slot other than the time slot in which the PDCCH scheduled for PUSCH is received, the terminal can assume R=0. That is, the terminal can determine whether the time slot assigned to the PUSCH is the same as the time slot assigned to the PDCCH, and then determine the value of R. Time is needed to calculate the PUSCH so that the terminal can transmit the PUSCH immediately after receiving the core. The minimum time required to calculate the PUSCH after receiving the PDCCH is called the PUSCH preparation time (T). proc,2 In other words, the terminal does not expect the PUSCH transmission to be configured / instructed by the base station before the PUSCH preparation time. Using this information, the terminal can determine the reference symbol index. For example, if the index of the OFDM symbol starting with the CORESET of the DCI scheduled for the PUSCH transmission is K and the length of the CORESET is D, the terminal can determine the reference symbol index via (K+D+T) mod N. symbols Obtain the reference symbol index (R). Here, T is a value indicating the PUSCH preparation time using the number of symbols. Execute mod N. symbolsThe reason for this is to allow the reference symbol index to have one of the values ​​0, 1, ..., 13, since the reference symbol index should be located within a time slot. If the terminal is scheduled to have a PUSCH in a time slot following T symbols immediately after the CORESET, then the reference symbol index (R) can be assumed to be (K+D+T) mod N. symbols However, if a time slot following this time slot is indicated, the reference symbol index R can be assumed to be 0.

[0559] If the subcarrier spacing (SCS) of the cell in which PDCCH is scheduled and the cell in which PUSCH is scheduled are different, the index K of the symbol starting the CORESET and the length L of the CORESET may be ambiguous. For example, if the SCS of the first cell in which PDCCH is scheduled (hereinafter SCS1) is greater than the SCS of the second cell in which PUCCH is scheduled (hereinafter SCS2), then one symbol of the first cell and multiple symbols of the second cell overlap. In this case, the symbol corresponding to the index (K) of the symbol starting the CORESET may be the earliest symbol among the symbols of the second cell that overlaps with the symbol starting the CORESET of the first cell. The length of the symbol of the second cell that overlaps with the CORESET of the first cell can be obtained by multiplying the length of the CORESET of the first cell by SCS2 / SCS1. Specifically, if the length of a symbol in the first cell is T, then the length of a symbol in the second cell is T*SCS2 / SCS1. Therefore, assuming the symbol duration of the CORESET in the first cell is 2 symbols, the symbol duration of the PUCCH in the second cell, in which the PUCCH is scheduled, is 2*SCS2 / SCS1. For example, when SCS2 is 15kHz and SCS1 is 30kHz, the CORESET of the first cell, which is 2 symbols long, overlaps with 1 symbol (2*15kHz / 30kHz) of the second cell.

[0560] The location of the DM-RS when PUSCH is repeatedly transmitted will be described below in this specification. The Time Domain Resource Assignment (TDRA) field of the DCI used for PUSCH scheduling can indicate not only the length of the PUSCH but also the location of the PUSCH DM-RS. If the terminal is indicated with PUSCH mapping type A, the PUSCH DM-RS can be transmitted at a fixed location within the time slot. If the terminal is indicated with PUSCH mapping type B, the PUSCH DM-RS can be transmitted in the first symbol among the symbols allocated with the PUSCH. That is, if the terminal is indicated with PUSCH mapping type B, the DM-RS can be transmitted in another symbol within the time slot according to the PUSCH schedule.

[0561] If the base station configures / instructs the terminal to repeatedly transmit PUSCH, and the terminal is instructed to have PUSCH mapping type A, then DM-RS should be transmitted at a fixed location (symbol) in the time slot according to PUSCH mapping type A. However, in the case of micro-timeslot-level repeated PUSCH transmission, the symbol duration for the first repeated PUSCH transmission includes the symbol to which DM-RS is located (mapped), making DM-RS transmission possible, but the symbol duration for the second repeated PUSCH transmission may not include the symbol to which DM-RS is mapped. Therefore, when the terminal performs repeated PUSCH transmission, it is necessary to determine where DM-RS is mapped so that it can be transmitted. The DM-RS transmission method will be described below in this specification.

[0562] First, a method is provided in which, in a first repeated PUSCH transmission, DM-RS is transmitted on a symbol mapped according to PUSCH mapping type A, and in the second repeated PUSCH transmission and subsequent repeated PUSCH transmissions, DM-RS is mapped to symbols according to PUSCH mapping type B for transmission. In other words, in the second repeated PUSCH transmission and subsequent repeated PUSCH transmissions, DM-RS can be transmitted on the first symbol in which each repeated PUSCH transmission is performed.

[0563] Next, a method is provided in which the terminal considers PUSCH mapping type B when sending DM-RS even if it is instructed to have PUSCH mapping type A via DCI. The difference from the method described above is that the terminal follows PUSCH mapping type B even in the first repeated PUSCH transmission, instead of following PUSCH mapping type A.

[0564] Figure 28 This is a diagram of a method for locating DM-RS during repeated PUSCH transmissions according to an embodiment of the present disclosure.

[0565] The following method is provided, in which, if a repeated PUSCH transmission includes DM-RS symbols according to PUSCH mapping type A, then DM-RS is sent according to mapping time A; otherwise, DM-RS symbols are sent according to PUSCH mapping type B. (See reference) Figure 28(a) A time slot comprises 6 symbols, and when the third symbol of each time slot corresponds to the position to which the DM-RS is mapped according to PUSCH mapping type A, the terminal transmits the DM-RS in that symbol because the symbol duration in which the first repeated PUSCH transmission (first time slot symbols 0 to 2) and the third repeated PUSCH transmission (second time slot symbols 0 to 2) are performed includes the DM-RS position according to mapping type A (the third symbol in the time slot, i.e., symbol 2 in each time slot). The remaining symbol duration in which the second repeated PUSCH transmission and the fourth repeated PUSCH transmission are performed does not include the DM-RS position, and the terminal can therefore transmit the DM-RS in the first symbol of the symbol duration in which the repeated PUSCH transmission is performed.

[0566] Subsequently, the first repeated PUSCH transmission sends DM-RS in a DM-RS symbol according to PUSCH mapping type A, while the second repeated PUSCH transmission and subsequent repeated PUSCH transmissions send DM-RS at the same position as the first repeated PUSCH transmission in the PUSCH. (See reference) Figure 28 (b) The DM-RS of PUSCH mapping type A is located in the third symbol of the symbol duration in which the first repeated PUSCH transmission is performed. Therefore, the DM-RS of PUSCH mapping type A is also located in the third symbol of the symbol duration in which repeated PUSCH transmissions are performed in the same manner in subsequent repeated PUSCH transmissions. This is to position the DM-RS at equal intervals in the time domain to minimize channel estimation errors in time-varying channels.

[0567] The location of the DM-RS of a PUSCH according to the reference symbol index will be described below in this specification. The TDRA field of the DCI used for PUSCH scheduling can indicate not only the length of the PUSCH but also the location of the DM-RS of the PUSCH. However, if the reference symbol index (R) is not fixed to 0, there may be cases where the symbols in which the PUSCH is scheduled do not include the symbols where the DM-RS of the PUSCH is located according to PUSCH mapping type A. In the current 3GPP standard, since R is always fixed to 0, the PUSCH symbols indicated by the TDRA field indicating SLIV and PUSCH mapping type A always include the symbols where the DM-RS of the PUSCH is located according to PUSCH mapping type A. The method for determining the location of the mapped DM-RS in the PUSCH will be described below in this specification.

[0568] i) If the symbol to which the DM-RS is mapped according to PUSCH mapping type A is included in the PUSCH indicated by the reference symbol index, then the DM-RS is transmitted in that symbol; otherwise, the DM-RS can be transmitted according to PUSCH mapping type B. That is, if the PUSCH determined according to the reference symbol index does not include the symbol to which the DM-RS according to PUSCH mapping type A is located, then the DM-RS can be transmitted in the first symbol of the PUSCH.

[0569] ii) If the terminal is indicated by the base station to have PUSCH mapping type A, the terminal can always assume R = 0 (that is, the symbol corresponding to the reference symbol index is the first symbol of the time slot), and when the terminal is indicated by the base station to have PUSCH mapping type B, R can be determined according to the aforementioned method. Therefore, by interpreting the reference symbol index differently according to the PUSCH mapping type, the case where the symbol to which the DM-RS is mapped will not occur even if the terminal is indicated by the base station to have PUSCH mapping type A.

[0570] The method for determining the reference symbol index of the PDSCH will be described below in this specification. As mentioned above, similar to the method for determining the reference symbol index of the PUSCH, a method for determining the reference symbol index (R) is also required in the case of the downlink PDSCH.

[0571] The terminal can determine the reference symbol index of the PDSCH based on the CORESET. Specifically, the first symbol of the CORESET in which the PDCCH for PDSCH scheduling is received can be the reference symbol index of the PDSCH. For example, if the first symbol of the CORESET in which the PDCCH is received is the R-th symbol of the time slot, and the SLIV of the TDRA field of the PDCCH indicates S and L, then the PDSCH can start from the R+S-th symbol of the time slot and can have a length of L.

[0572] In the following section of this specification, a method for determining the reference symbol index of the PDSCH when cross-carrier scheduling is indicated will be described. If the SCS of the cell in which the PDCCH is received is the same as the SCS of the cell in which the PDSCH is received, the first symbol of the CORESET in which the PDCCH is received can be determined as the reference symbol of the PDSCH. However, if the SCS of the cell in which the PDCCH is received is different from the SCS of the cell in which the PDSCH is received, the following method can be considered.

[0573] Figure 29 This is a diagram illustrating a method for determining the reference symbol index of a PDSCH according to an embodiment of the present disclosure.

[0574] i) If the SCS of the cell in which PDCCH is received is different from the SCS of the cell in which PDSCH is received, the index of the earliest symbol among the symbols of the cell in which PDSCH is transmitted that overlaps with the first symbol of the CORESET of PDCCH can be determined as the reference symbol index of PDSCH. Figure 29 (a) shows the case where the SCS of the cell receiving the PDCCH (DL cell #0) is smaller than the SCS of the cell receiving the PDSCH (DL cell #1). The first symbol of the PDCCH CORESET and two symbols (A and B) of the cell receiving the PDSCH may overlap. The index of the first symbol A of the two symbols can be determined as the reference symbol index of the PDSCH. If the first symbol of the CORESET is symbol n of the slot of the cell receiving the PDCCH, then the reference symbol index in the cell receiving the PDSCH is floor(n*2). u1-u0 )mod N symbol Here, the SCS of the cell receiving the PDCCH is 2. u1 kHz, where the SCS of the cell receiving PDSCH is 2 u2 kHz, and N symbol It is the number of symbols included in a time slot.

[0575] ii) If the SCS of the cell in which the PDCCH is received is different from the SCS of the cell in which the PDSCH is transmitted, the latest symbol among the symbols of the cell in which the PDSCH is transmitted, which overlaps with the first symbol of the PDCCH CORESET, can be determined as the reference symbol index of the PDSCH. Figure 29 (a) shows the case where the SCS of the cell receiving the PDCCH (DL cell #0) is smaller than the SCS of the cell receiving the PDSCH (DL cell #1). The first symbol of the PDCCH CORESET and the two symbols (A and B) of the cell receiving the PDSCH may overlap. In this case, the index of the last symbol (B) of the two symbols can be determined as the reference symbol index of the PDSCH. If the first symbol of the CORESET is symbol n of the time slot of the cell receiving the PDCCH, then the reference symbol index in the cell receiving the PDSCH is ceil((n+1)*2). u1-u0 )-1mod N symbol Here, the SCS of the cell receiving the PDCCH is 2. u1 kHz, where the SCS of the cell receiving PDSCH is 2 u2 kHz, and N symbolIt is the number of symbols included in a time slot.

[0576] iii) Methods i) and ii) above have the following problem: the index of a symbol starting before the CORESET of the PDCCH can be the reference symbol index of the PDSCH. If the index of a symbol starting before the CORESET of the PDCCH is the reference symbol index of the PDSCH, the terminal needs to buffer the previous symbol. For example, Figure 29 (b) illustrates the case where the SCS of the cell receiving the PDCCH (DL cell #0) is greater than the SCS of the cell receiving the PDSCH (DL cell #1). In this case, the first symbol of the CORESET overlaps with a symbol A of the cell receiving the PDSCH. When the aforementioned methods i) and ii) are applied, the index of symbol A is determined as the reference symbol index. However, symbol A begins before the first symbol of the CORESET, so the terminal needs to perform buffering, which introduces an increased complexity problem.

[0577] Therefore, to solve this problem, the index of the earliest symbol among the symbols of the cell that received the PDSCH, preceding the first symbol of the CORESET in the PDCCH, can be determined as the reference symbol index. Figure 29 In (b), symbol A begins before the first symbol of CORESET, making the index of symbol A unsuitable as the reference symbol index. Therefore, the index of the subsequent symbol B can be determined as the reference symbol index. Figure 29 In (a), the SCS of the cell receiving the PDCCH (DL cell #0) is smaller than the SCS of the cell receiving the PDSCH (DL cell #1), where symbol A and the first symbol of CORESET start simultaneously. Therefore, the index of symbol A can be determined as the reference symbol index.

[0578] The method by which the terminal determines the reference symbol index based on CORESET may not be suitable for cross-carrier scheduling. In other words, the terminal does not expect to simultaneously apply the methods for determining the reference symbol index based on both CORESET and cross-carrier scheduling in its RRC configuration. In other words, the terminal can consider this an error condition.

[0579] When a terminal is instructed to have cross-carrier scheduling, the terminal can determine the first symbol index of the time slot as the reference symbol index. In the case of self-carrier scheduling (i.e., if PDCCH and PDSCH are transmitted in the same cell), the terminal can determine the reference symbol index according to methods i) to iii). When a terminal ...

Claims

1. A user equipment configured to operate in a wireless communication system, the user equipment comprising: transceiver; and A processor configured to control the transceiver. The processor is configured as follows: Receive the Physical Downlink Control Channel (PDCCH), which includes resource information for receiving the Physical Downlink Shared Channel (PDSCH). The resource information indicates the symbol allocation length and symbol index related to the resources used for receiving the PDSCH, and Receive the PDSCH on the resource determined based on the resource information. The starting symbol index of the resource is determined based on the sum of the symbol index and the reference symbol index. When the condition is met, the reference symbol index is the index of the earliest symbol among the symbols used to monitor the PDCCH; when the condition is not met, the reference symbol index is the index of the earliest symbol in the time slot used for receiving the PDSCH. The conditions include the following: when cross-carrier scheduling is configured, the first subcarrier interval SCS in which the first bandwidth of the PDCCH is received is the same as the second SCS in which the second bandwidth of the PDCCH is received.

2. The user equipment according to claim 1, wherein The index of the earliest symbol in the time slot is 0.

3. The user equipment according to claim 1, wherein The resource information further includes the mapping type of the PDSCH associated with a first position of the demodulation-reference signal DM-RS mapped to the resource.

4. The user equipment according to claim 3, wherein The first position of the DM-RS is mapped to the earliest symbol in the resource.

5. A method performed by a user equipment in a wireless communication system, the method comprising: Receive the Physical Downlink Control Channel (PDCCH), which includes resource information for receiving the Physical Downlink Shared Channel (PDSCH). The resource information indicates the symbol allocation length and symbol index related to the resources used for receiving the PDSCH; and Receive the PDSCH on the resource determined based on the resource information. The starting symbol index of the resource is determined based on the sum of the symbol index and the reference symbol index. When the condition is met, the reference symbol index is the index of the earliest symbol among the symbols used to monitor the PDCCH; when the condition is not met, the reference symbol index is the index of the earliest symbol in the time slot used for receiving the PDSCH. The conditions include the following: when cross-carrier scheduling is configured, the first subcarrier interval SCS in which the first bandwidth of the PDCCH is received is the same as the second SCS in which the second bandwidth of the PDCCH is received.

6. The method according to claim 5, wherein, The index of the earliest symbol in the time slot is 0.

7. The method according to claim 5, wherein The resource information further includes the mapping type of the PDSCH associated with a first position of the demodulation-reference signal DM-RS mapped to the resource.

8. The method according to claim 7, wherein The first position of the DM-RS is mapped to the earliest symbol in the resource.

9. A base station configured to operate in a wireless communication system, the base station comprising: transceiver; and A processor configured to control the transceiver. The processor is configured as follows: Transmit the Physical Downlink Control Channel (PDCCH), which includes resource information for the transmission of the Physical Downlink Shared Channel (PDSCH). The resource information indicates the symbol allocation length and symbol index related to the resources used for the transmission of the PDSCH, and The PDSCH is sent on the resource determined based on the resource information. The starting symbol index of the resource is determined based on the sum of the symbol index and the reference symbol index. When the condition is met, the reference symbol index is the index of the earliest symbol among the symbols used to monitor the PDCCH; and when the condition is not met, the reference symbol index is the index of the earliest symbol in the time slot used for transmitting the PDSCH. The conditions include the following: when cross-carrier scheduling is configured, the first subcarrier interval SCS in which the first bandwidth of the PDCCH is transmitted is the same as the second SCS in which the second bandwidth of the PDCCH is transmitted.

10. The base station according to claim 9, wherein The index of the earliest symbol in the time slot is 0.

11. The base station according to claim 9, wherein The resource information further includes the mapping type of the PDSCH associated with a first position of the demodulation-reference signal DM-RS mapped to the resource.

12. The base station according to claim 11, wherein The first position of the DM-RS is mapped to the earliest symbol in the resource.

13. A method performed via a base station in a wireless communication system, the method comprising: Transmit the Physical Downlink Control Channel (PDCCH), which includes resource information for the transmission of the Physical Downlink Shared Channel (PDSCH). The resource information indicates the symbol allocation length and symbol index related to the resources used for the transmission of the PDSCH; and The PDSCH is sent on the resource determined based on the resource information. The starting symbol index of the resource is determined based on the sum of the symbol index and the reference symbol index. When the condition is met, the reference symbol index is the index of the earliest symbol among the symbols used to monitor the PDCCH; when the condition is not met, the reference symbol index is the index of the earliest symbol in the time slot used for transmitting the PDSCH. The conditions include the following: when cross-carrier scheduling is configured, the first subcarrier interval SCS in which the first bandwidth of the PDCCH is transmitted is the same as the second SCS in which the second bandwidth of the PDCCH is transmitted.

14. The method according to claim 13, wherein, The index of the earliest symbol in the time slot is 0.

15. The method according to claim 13, wherein, The resource information further includes a mapping type of the PDSCH related to a first location of a demodulation-reference signal (DM-RS) mapped to the resource.

16. The method of claim 15, wherein The first location of the DM-RS is mapped to an earliest symbol in the resource.

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