Method, apparatus and system for transmitting and receiving a physical uplink shared channel (PUSCH) in a wireless communication system

Abstract

A method for a terminal to transmit a physical uplink shared channel (PUSCH) to a base station in a wireless communication system is disclosed. The terminal can receive, from the base station, configuration information for the PUSCH transmission and a physical downlink control channel (PDCCH) for scheduling a repeated transmission of the PUSCH. Thereafter, the terminal can determine one or more invalid symbols for the repeated transmission of the PUSCH, and can repeatedly transmit the PUSCH on symbols other than the determined symbols.

Description

TECHNICAL FIELD

[0001] The present application relates to a wireless communication system, and more particularly, to a method for transmitting and receiving a physical uplink shared channel (PUSCH) in a wireless communication system. BACKGROUND

[0002] 3GPP LTE(-A) defines uplink / downlink physical channels to transmit physical layer signals. For example, a physical uplink shared channel (PUSCH) as a physical channel for transmitting data through an uplink, a physical uplink control channel (PUCCH) for transmitting control signals, a physical random access channel (PRACH), etc. are defined, and there are a physical downlink shared channel (PDSCH) for transmitting data to a downlink, and a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), etc. for transmitting L1 / L2 control signals.

[0003] Among the above-described channels, a downlink control channel (PDCCH / EPDCCH) is a channel for a base station to transmit uplink / downlink scheduling allocation control information, uplink transmission power control information, and other control information to one or more user equipments. Since resources available for a PDCCH that can be transmitted by a base station at one time are limited, different resources cannot be allocated to each user equipment, and control information should be transmitted to an arbitrary user equipment by sharing resources. For example, in 3GPP LTE(-A), four resource elements (REs) can be grouped to form a resource element group (REG), nine control channel elements (CCEs) can be generated, a resource capable of combining and transmitting one or more CCEs can be notified to a user equipment, and a plurality of user equipments can share and use the CCEs. Here, the number of combined CCEs is referred to as a CCE aggregation level, and a resource to which CCEs are allocated according to possible CCE aggregation levels is referred to as a search space. The search space can include a common search space defined for each base station and a terminal-specific or UE-specific search space defined for each user equipment. A user equipment performs decoding for a plurality of cases of all possible CCE combinations in the search space, and can identify whether the user equipment belongs to the PDCCH by a user equipment (UE) identifier included in the PDCCH. Accordingly, such an operation of the user equipment requires a long time to decode the PDCCH, and inevitably causes a large amount of energy consumption.

[0004] Efforts are being made to develop an improved 5G communication system or a pre-5G communication system to meet the increasing demand for wireless data traffic after the commercialization of the 4G communication system. To this end, the 5G communication system or the pre-5G communication system is called a beyond 4G network communication system or a post LTE system. Consideration is given to implementing the 5G communication system in an ultra-high frequency (mmWave) band (e.g., a 60-GHz band) to achieve a high data transmission rate. To reduce a radio propagation path loss and increase a transmission distance of a radio wave in the ultra-high frequency band, beamforming, massive MIMO, full dimensional MIMO (FD-MIMO), array antenna, analog beam forming, and large scale antenna techniques are discussed in the 5G communication system field. Further, to improve network of the system, technologies such as a small cell, cloud radio access network (cloud RAN), ultra-dense network, device to device communication (D2D), wireless backhaul, moving network, cooperative communication, coordinated multi-point (CoMP), interference cancellation, etc. are developed in the 5G communication system field. In addition, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) that are an advanced coding modulation (ACM) scheme, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) that are an advanced access technology are developed in the 5G system field.

[0005] Meanwhile, in a human centered connectivity network where humans generate and consume information, the Internet has evolved into an Internet of Things (IoT) network through which distributed components such as objects exchange information. Internet of Everything (IoE) technology, which is a combination of the IoT technology and big data processing technology through connection with a cloud server, is also on the rise. To implement the IoT, technology elements such as a sensing technology, a wired / wireless communication and network infrastructure, a service interface technology, and a security technology are required, and in recent years, a technique such as a sensor network, a machine to machine (M2M), and machine type communication (MTC) has been researched to connect objects with each other in the IoT environment. In the IoT environment, an intelligent Internet technology (IT) service that collects and analyzes generated data to create new value in a human life is provided, and through convergence of the existing IT and various industries, the IoT can be applied to fields such as a smart home, a smart building, a smart city, a smart car or a connected car, a smart grid, health care, a smart home appliance, and an advanced medical service.

[0006] Here, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, Machine-to-Machine (M2M) and Machine Type Communication (MTC) are implemented using the 5G communication technology, i.e., beamforming, MIMO, array antenna, etc. Application of a cloud Radio Access Network (cloud RAN) as the above-described big data processing technology can be an example of convergence of the 5G technology and the IoT technology.

[0007] In general, a mobile communication system has been developed to provide a voice service while protecting the activities of users. However, the field of the mobile communication system has been expanded not only to the voice service but also to the data service, and has been developed to provide a high-speed data service at the present time. However, in the mobile communication system for providing a service at the present time, a resource shortage phenomenon occurs, and users need a more high-speed service. Therefore, a more advanced wireless communication system is required.

[0008] As described above, with the advent of new applications such as real-time control and tactile Internet, the future 5G technology requires a lower data transmission delay, and it is expected that the required delay of 5G data is reduced to 1 ms. The purpose of 5G is to provide a data delay that is reduced by about 10 times compared to the existing technology. In order to solve this problem, it is expected to propose a 5G communication system that uses a mini-slot having a shorter TTI interval (for example, 0.2 ms) in addition to the existing slot (or subframe).

[0009] In Rel-16 enhanced URLLC (eURLLC), various techniques for providing a lower delay time and a higher reliability are discussed. In order to provide a lower delay, transmission of an uplink control channel including two or more HARQ-ACKs in a single slot is supported. The user equipment is able to transmit the HARQ-ACK as a response to successful reception of a downlink shared channel as fast as possible, thereby ensuring a lower delay time. SUMMARY

[0010] TECHNICAL PROBLEM

[0011] An object of embodiments of the present application is to provide a method for a user equipment to repeatedly transmit a physical uplink shared channel (PUSCH) to a base station in a wireless communication system and a user equipment thereof.

[0012] TECHNICAL SOLUTION

[0013] A method for a user equipment to transmit a physical uplink shared channel (PUSCH) to a base station in a wireless communication system includes the following steps: receiving configuration information from the base station for PUSCH transmission, the configuration information including resource information related to a control resource set for an initial access procedure; receiving a physical downlink control channel (PDCCH) for scheduling repeated transmissions of the PUSCH; determining one or more invalid symbols for repeated transmissions of the PUSCH; and repeatedly transmitting the PUSCH on at least one symbol scheduled by the PDCCH, excluding the invalid symbols, wherein the one or more invalid symbols are indicated by the resource information related to the control resource set for the initial access procedure.

[0014] Furthermore, in this invention, the configuration information is indicated by the PBCH, and the control resource set has an index value of 0.

[0015] Furthermore, in this invention, one or more invalid symbols further include: symbols indicated by semi-static downlink symbols for downlink reception and synchronization signals (SS), and / or symbols for receiving the physical broadcast channel (PBCH) in a cell in which PUSCH is performed repeatedly.

[0016] Furthermore, in this invention, the semi-static downlink symbols and the symbols used for receiving the PBCH are indicated by configuration information.

[0017] Furthermore, in this invention, when the user equipment only supports half-duplex mode, one or more invalid symbols further include: symbols indicating the reception of downlink channels and signals, and / or symbols indicated by semi-static downlink symbols in cells different from those in which repeated transmissions of PUSCH are performed.

[0018] Furthermore, in this invention, one or more invalid symbols further include gap symbols, and the gap symbols are at least one symbol positioned after a symbol indicating downlink reception.

[0019] Furthermore, in this invention, the subcarrier spacing of the gap symbol is a reference subcarrier spacing included in the semi-static uplink and / or downlink configuration information of the cell in which the gap symbol is applied to the repeated transmission of PUSCH.

[0020] Furthermore, in this invention, the symbol indicated for downlink reception is a semi-static downlink symbol, a symbol for receiving SSB / PBCH blocks, or a symbol included in the control resource set.

[0021] Further, in the present application, when symbols in which the repetition transmission of the PUSCH is performed and symbols for transmitting a physical uplink control channel (PUCCH) overlap each other on at least one symbol, uplink control information (UCI) of the PUSCH and the PUCCH is multiplexed and transmitted on a first symbol set among at least one symbol set including at least one symbol, and the at least one symbol set is a resource in which the repetition transmission of the PUSCH is performed.

[0022] Further, in the present application, the PUSCH transmitted on the first symbol set satisfies a processing time for multiplexing with the UCI.

[0023] Further, in the present application, the PUSCH and the UCI are multiplexed only when the number of symbols for repeatedly transmitting the PUSCH exceeds one in each slot.

[0024] Further, the present application provides a user equipment comprising: a communication module; and a processor for controlling the communication module, wherein the processor: receives configuration information for a PUSCH transmission from a base station, the configuration information including resource information related to a control resource set for an initial access procedure; receives a physical downlink control channel (PDCCH) for scheduling a repetition transmission of the PUSCH; determines one or more invalid symbols for the repetition transmission of the PUSCH; and repeatedly transmits the PUSCH on at least one symbol scheduled by the PDCCH except for the invalid symbols, wherein the one or more invalid symbols are indicated by the resource information related to the control resource set for the initial access procedure.

[0025] Advantageous Effects

[0026] According to an embodiment of the present application, according to the method for repeatedly transmitting a PUSCH by a user equipment to a base station, it is possible to achieve the target performance of the 5G wireless communication system to provide a low-delay high-reliability service by enabling the user equipment to repeatedly transmit the PUSCH to the base station as quickly as possible.

[0027] Effects obtainable from this disclosure are not limited to what has been particularly described hereinabove and other effects which are not specifically described will be readily apparent to those skilled in the art from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 FIG. illustrates an example of a radio frame structure used in a wireless communication system.

[0029] Figure 2 FIG. illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.

[0030] Figure 3is a diagram for explaining a physical channel used in a 3GPP system and a typical signal transmission method using the physical channel.

[0031] Figure 4 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system.

[0032] Figure 5 illustrates a procedure for transmitting control information and a control channel in a 3GPP NR system.

[0033] Figure 6 illustrates a control resource set (CORESET) in which a physical uplink control channel (PUCCH) can be transmitted in a 3GPP NR system.

[0034] Figure 7 illustrates a method for configuring a PDCCH search space in a 3GPP NR system.

[0035] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0036] Figure 9 is a diagram for explaining signal carrier communication and multi-carrier communication.

[0037] Figure 10 is a diagram showing an example in which a cross-carrier scheduling technique is applied.

[0038] Figure 11 is a block diagram illustrating a configuration of a user equipment and a base station according to an embodiment of the present application.

[0039] Figure 12 is a flowchart illustrating an example of transmitting / receiving a physical uplink shared channel (PUSCH) according to an embodiment of the present application.

[0040] Figures 13 to 18 is a diagram illustrating an example in which a PUSCH includes four PUSCH repetitions according to an embodiment of the present application.

[0041] Figures 19 to 22 is a diagram illustrating an example of a slot format for repetition transmission of a PUSCH according to an embodiment of the present application.

[0042] Figure 23 and Figure 24 is a diagram illustrating another example of a symbol in which repetition transmission of a PUSCH cannot be performed according to an embodiment of the present application.

[0043] Figure 25 illustrates an example of a method for determining an invalid symbol according to an embodiment of the present application.

[0044] Figure 26FIG. 13 is a flowchart illustrating an example of a method for determining symbols of a repetition transmission of a PUSCH according to an embodiment of the present application.

[0045] Figure 27 FIG. 14 is another example of a method for determining symbols of a repetition transmission of a PUSCH according to an embodiment of the present application.

[0046] Figure 28 FIG. 15 is another example of a method for determining symbols of a repetition transmission of a PUSCH according to an embodiment of the present application.

[0047] Figure 29 FIG. 16 is a flowchart illustrating an example of a method for a user equipment to perform a repetition transmission of a PUSCH according to an embodiment of the present application.

[0048] Figure 30 FIG. 17 is a flowchart illustrating an example of a method for a base station to receive a repetition transmission of a PUSCH according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] The terms used in the specification are adopted to describe the present application as much as possible in consideration of functions in the application, but can be changed according to the intention of those skilled in the art, customs, and the emergence of new technologies. In addition, in specific cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning thereof will be described in the corresponding description part of the present application. Therefore, it is intended that the terms used in the specification should not be analyzed based only on the name of the term, but should be analyzed based on the substantial meaning of the term and the context in the entire specification.

[0050] Throughout the specification and the subsequent claims, when it is described that one element is "connected" to another element, the one element can be "directly connected" to the other element or "electrically connected" to the other element through a third element. In addition, unless explicitly described to the contrary, the word "comprise" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. Furthermore, in some example embodiments, a limitation such as "greater than or equal to" or "less than or equal to" based on a specific threshold value can be appropriately replaced with "greater than" or "less than", respectively.

[0051] The following techniques 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), single carrier-FDMA (SC-FDMA), etc. The CDMA can be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. The TDMA can be implemented by a radio technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). The OFDMA can be implemented by a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), etc. The UTRA is a part of a universal mobile telecommunications system (UMTS). A 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of an evolved UMTS (E-UMTS) using the evolved UTRA (E-UTRA), and LTE-advanced (A) is an evolved version of the 3GPP LTE. The 3GPP new radio (NR) is a system designed separately from the LTE / LTE-A, and is a system for supporting enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine type communication (mMTC) services as requirements of IMT-2020. For clarity, the 3GPP NR is mainly described, but the technical idea of the present application is not limited thereto.

[0052] Unless otherwise specified in the present specification, a base station can refer to a next-generation node B (gNB) defined in the 3GPP NR. Also, unless otherwise specified, a terminal can refer to a user equipment (UE). Although the detailed embodiments are classified into embodiments to help understanding, the embodiments can be used in combination. In the present disclosure, the configuration of a user equipment can mean a configuration by a base station. In detail, the base station can transmit a signal to the user equipment to set a parameter value used in the operation of the user equipment or a wireless communication system.

[0053] Figure 1 FIG. 1 illustrates an example of a radio frame structure used in a wireless communication system.

[0054] Reference Figure 1 A radio frame (or radio frame) used in the 3GPP NR system can have a length of 10 ms (Δf max N f / 100)*T c ) of 10 ms. Also, the radio frame includes 10 subframes (SFs) of equal size. Here, Δf max = 480*10 3 Hz, Nf = 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 respectively assigned to 10 subframes within one radio frame. The length of each subframe is 1 ms and can include one or more slots according to the subcarrier spacing. More specifically, in the 3GPP NR system, the subcarrier spacing that can be used is 15*2 μ kHz, and μ can have values of μ = 0, 1, 2, 3, 4 as a subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for the subcarrier spacing. One subframe of 1 ms in length can include 2 μ slots. In this case, the length of each slot is 2 -μ ms. Numbers from 0 to 2 μ -1 can be respectively assigned to 2 μ slots within one subframe. Also, numbers from 0 to 10*2 μ -1 can be respectively assigned to slots within one radio frame. The time resources can be distinguished by at least one of a radio frame number (also referred to as a radio frame index), a subframe number (also referred to as a subframe index), and a slot number (or slot index).

[0055] Figure 2 An example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system is illustrated. In particular, Figure 2 the structure of a resource grid of a 3GPP NR system is shown.

[0056] There is one resource grid per antenna port. Referring to Figure 2 , a slot includes a plurality of orthogonal frequency-division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. One OFDM symbol also refers to one symbol interval. Unless otherwise specified, the OFDM symbol can be simply referred to as a symbol. One RB includes 12 consecutive subcarriers in the frequency domain. Referring to Figure 2 , a signal transmitted per slot can be represented by a resource grid including N size,μ grid,x *N RB sc subcarriers and N slot symb OFDM symbols. Here, x = DL when the signal is a DL signal, and x = UL when the signal is an UL signal. N size,μ grid,xdenotes the number of resource blocks (RBs) according to the subcarrier spacing component p (x is DL or UL), and N slot symb denotes the number of OFDM symbols in a slot. N RB sc is the number of subcarriers that constitute one RB and N RB sc = 12. The OFDM symbols can be referred to as cyclic-shifted OFDM (CP-OFDM) symbols or discrete Fourier transform-spread OFDM (DFT-s-OFDM) symbols, depending on the multiple access scheme.

[0057] The number of OFDM symbols included in one slot can vary depending on the length of a cyclic prefix (CP). For example, one slot includes 14 OFDM symbols in the case of a normal CP, but one slot can include 12 OFDM symbols in the case of an extended CP. In certain embodiments, the extended CP can only be used with a 60 kHz subcarrier spacing. In Figure 2 For convenience of description, one slot is configured with 14 OFDM symbols as an example in the present disclosure, but embodiments of the present disclosure can be applied to a slot having a different number of OFDM symbols in a similar manner. Referring to Figure 2 , each OFDM symbol includes N size,μ grid,x * N RB sc subcarriers in the frequency domain. The types of subcarriers can be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of a reference signal, and a guard band. The carrier frequency is also referred to as a center frequency (fc).

[0058] One RB can be defined by N RB sc (e.g., 12) consecutive subcarriers in the frequency domain. For reference, a resource configured with one OFDM symbol and one subcarrier can be referred to as a resource element (RE) or a tone. Accordingly, one RB can be configured with N slot symb * N RB sc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) in one slot. k can be an index assigned from 0 to N size,μ grid,x * N RB sc - 1 in the frequency domain, and l can be an index assigned from 0 to N slot symb - 1 in the time domain.

[0059] To let the UE receive a signal from or transmit a signal to the base station, the time / frequency of the UE can be synchronized with that of the base station. This is because when the base station and the UE are synchronized, the UE is able to determine the time and frequency parameters necessary to demodulate a DL signal at the right time and transmit a UL signal.

[0060] Each symbol of a radio frame used in time division duplex (TDD) or unpaired spectrum can be configured with at least one of a DL symbol, a UL symbol, and a flexible symbol. A radio frame used as a DL carrier in frequency division duplex (FDD) or paired spectrum can be configured with a DL symbol or a flexible symbol, and a radio frame used as a UL carrier can be configured with a UL symbol or a flexible symbol. In a DL symbol, a DL transmission is possible, but a UL transmission is not possible. In a UL symbol, a UL transmission is possible, but a DL transmission is not possible. The flexible symbol can be determined to be used as a DL or a UL according to a signal.

[0061] Information on the type of each symbol, i.e., information indicating any one of a DL symbol, a UL symbol, and a flexible symbol, can be configured with a cell-specific or common radio resource control (RRC) signal. In addition, the information on the type of each symbol can be additionally configured with a UE-specific or dedicated RRC signal. The base station signals i) a period of a cell-specific slot configuration, ii) a number of slots having only DL symbols from the beginning of the period of the cell-specific slot configuration, iii) a number of DL symbols from the first symbol of a slot immediately after the slot having only DL symbols, iv) a number of slots having only UL symbols from the end of the period of the cell-specific slot configuration, and v) a number of UL symbols from the last symbol of a slot immediately before the slot having only UL symbols, by using the cell-specific RRC signal. Here, a symbol not configured with any one of a UL symbol and a DL symbol is a flexible symbol.

[0062] When the information on the symbol type is configured with the UE-specific RRC signal, the base station can signal whether a flexible symbol is a DL symbol or a UL symbol with the cell-specific RRC signal. In this case, the UE-specific RRC signal cannot change a DL symbol or a UL symbol configured with the cell-specific RRC signal into another symbol type. The UE-specific RRC signal can signal a number of DL symbols among N slot symb symbols of a corresponding slot of each slot and a number of UL symbols among N slot symbthe number of UL symbols among the symbols. In this case, the DL symbols of the slot can be consecutively configured with the first symbol to the i-th symbol of the slot. Also, the UL symbols of the slot can be consecutively configured with the j-th symbol to the last symbol of the slot (where i < j). In the slot, the symbol which is not configured with any one of the UL symbols and the DL symbols is a flexible symbol.

[0063] The symbol type configured by the RRC signal can be referred to as a semi-static DL / UL configuration. In the semi-static DL / UL configuration configured by the RRC signal, the flexible symbol can be indicated as a downlink symbol, an uplink symbol, or a flexible symbol by dynamic slot format information (SFI) transmitted via a physical downlink control channel (PDCCH). In this case, the downlink symbol or the uplink symbol configured by the RRC signal does not change into another symbol type. Table 1 illustrates the dynamic SFI that the base station can indicate to the user equipment.

[0064] Figure 3 is a diagram for explaining a physical channel used in a 3GPP system (for example, NR) and a typical signal transmission method using the physical channel.

[0065] If the power of the UE is turned on or the UE camps on a new cell, the UE performs an initial cell search (S101). Specifically, the UE can be synchronized 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 be synchronized 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.

[0066] Upon completion of the initial cell search, the UE receives a physical downlink shared channel (PDSCH) according to 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 user equipment is cell common system information for normal operation of the user equipment in a physical layer in radio resource control (RRC) and is referred to as remaining system information or system information block (SIB) 1.

[0067] When the UE initially accesses the base station or does not have a radio resource for signal transmission, the UE can perform a random access procedure on the base station (operations S103 to S106). First, the UE is able to transmit a preamble through a physical random access channel (PRACH) (S103) and receive a response message for the preamble through a PDCCH and a corresponding PDSCH from the base station (S104). When the UE receives a valid random access response message, the UE transmits data including an identifier of the UE or the like to the base station through a physical uplink shared channel (PUSCH) indicated by a UL grant transmitted through the PDCCH from the base station (S105). Next, the UE waits for reception of a PDCCH as an indication of the base station for collision resolution. If the UE successfully receives the PDCCH through the identifier of the UE (S106), the random access procedure is terminated. The user equipment can obtain terminal-specific system information required for the user equipment to correctly operate in a physical layer in an RRC layer during the random access procedure. When the user equipment obtains the terminal-specific system information from the RRC layer, the user equipment enters an RRC connected mode.

[0068] The RRC layer is used to generate or manage messages between the user equipment and a radio access network (RAN). In more detail, the base station and the user equipment can perform, in the RRC layer, cell system information required for all user equipments in a broadcast cell, management of transmission of a paging message, mobility management and handover, measurement reporting and control thereof of the user equipment, and storage management including user equipment capability management and device management. In general, since an update of a signal (hereinafter, an RRC signal) transmitted in the RRC layer is longer than a transmission / reception period (i.e., a transmission time interval (TTI)) in the physical layer, the RRC signal can be maintained for a long period and not changed.

[0069] After the above-described procedure, the UE receives a PDCCH / PDSCH (S107) and transmits a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general UL / DL signal transmission procedure. In particular, the UE can receive downlink control information (DCI) through a PDCCH. The DCI can include control information such as resource allocation information for the UE. In addition, a format of the DCI can vary according to a predetermined use. Uplink control information (UCI) transmitted by the UE to the base station through a UL includes a DL / UL ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and the like. Here, the CQI, the PMI, and the RI can be included in channel state information (CSI). In the 3GPP NR system, the UE can transmit control information such as the HARQ-ACK and the CSI described above through the PUSCH and / or the PUCCH.

[0070] Figure 4 The SS / PBCH block is illustrated for initial cell access in a 3GPP NR system.

[0071] When a power is turned on or wants to access a new cell, a UE can obtain time and frequency synchronization with the cell and perform an initial cell search procedure. The UE can detect a physical cell identity N cell ID . To this end, the UE can receive a synchronization signal, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from a base station and synchronize with the base station. In this case, the UE is able to obtain information such as a cell identity (ID).

[0072] Referring to Figure 4 (a), a synchronization signal (SS) will be described in more detail. The synchronization signal can be classified into a PSS and an SSS. The PSS can be used to obtain time domain synchronization and / or frequency domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS can be used to obtain frame synchronization and a cell group ID. Referring to Figure 4 (a) and Table 2, the SS / PBCH block can be configured with 20 consecutive RBs (= 240 subcarriers) on a frequency axis and can be configured with 4 consecutive OFDM symbols on a time axis. In this case, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol and the SSS is transmitted in the third OFDM symbol through the 56th to 182nd subcarriers. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit a signal through the remaining subcarriers, that is, the 0th to 55th subcarriers and the 183rd to 239th subcarriers. Further, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit a signal through the 48th to 55th subcarriers and the 183rd to 191st subcarriers. The base station transmits a physical broadcast channel (PBCH) through the remaining REs other than the above signals in the SS / PBCH block.

[0073] [Table 1]

[0074]

[0075] The SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each including three unique identifiers, specifically, such that each physical layer cell ID will be only a part of one physical layer cell identifier group, by the combination of three PSS and SSS. Thus, the physical layer cell ID N cell ID = 3N (1) ID + N(2) ID an index N ranging from 0 to 335 indicating a group of physical layer cell identifiers (1) ID and an index N ranging from 0 to 2 indicating a physical layer identifier in the group of physical layer cell identifiers (2) ID is uniquely defined. The UE can detect the PSS and identify one of the three unique physical layer identifiers. In addition, the UE can detect the SSS and identify one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d PSS (n) is as follows.

[0076] d PSS (n) = 1 - 2x(m)

[0077] 0≤n<127

[0078] Here, x(i+7) = (x(i+4) + x(i)) mod 2 and is given as

[0079] [x(6) x(5) x(4) x(3) x(2) x(1) x(0)] = [1 1 1 0 1 1 0]

[0080] In addition, the sequence d SSS (n) of the SSS is as follows.

[0081] d SSS (n) = [1 - 2x0((n + m0) mod 127) I1 - 2x1((n + m1) mod 127)]

[0082]

[0083] 0≤n<127

[0084] Here, and is given as

[0085]

[0086] A radio frame with a length of 10 ms can be divided into two half-frames with a length of 5 ms. With reference to Figure 4Section (b) 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.

[0087] Figure 5 The diagram illustrates the process of transmitting control information and using the control channel in a 3GPP NR system. (Reference) Figure 5of (a), the base station can add a cyclic redundancy check (CRC) masked (e.g., exclusive-OR operation) with a radio network temporary identifier (RNTI) to control information (e.g., downlink control information (DCI)) (S202). The base station can scramble the CRC with an RNTI value determined according to a purpose / target of each control information. A common RNTI used by one or more UEs can include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). Also, a UE-specific RNTI can include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. Thereafter, the base station can perform rate matching according to a resource amount for PDCCH transmission after performing channel coding (e.g., polar coding) (S204). Thereafter, the base station can multiplex the DCI based on a control channel element (CCE)-based PDCCH structure (S208). Also, the base station can apply additional procedures such as scrambling, modulation (e.g., QPSK), interleaving, etc. to the multiplexed DCI (S210), and then map the DCI to a resource to be transmitted. The CCE is a basic resource unit for the PDCCH, and one CCE can include a plurality of (e.g., six) resource element groups (REGs). One REG can be configured with a plurality of (e.g., 12) REs. The number of CCEs used for one PDCCH can be defined as an aggregation level. In the 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 can be used. Figure 5 of (b) is a diagram related to a CCE aggregation level and multiplexing of PDCCHs, and illustrates a type of a CCE aggregation level for one PDCCH and CCEs transmitted in a control region therefrom.

[0088] Figure 6 A control resource set (CORESET) in which a physical downlink control channel (PUCCH) can be transmitted in a 3GPP NR system is illustrated.

[0089] 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 monitoring all frequency bands used for PDCCH reception, and decode the PDCCH mapped to the CORESET. The base station can configure one or more CORESETs for each cell for the UE. A CORESET can be configured with up to three consecutive symbols on the time axis. Additionally, CORESETs can be configured in units of six consecutive PRBs on the frequency axis. Figure 5 In this embodiment, CORESET#1 is configured with consecutive PRBs, while CORESET#2 and CORESET#3 are configured with discontinuous PRBs. A CORESET can reside in any symbol within a time slot. For example, in... Figure 5 In one embodiment, 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.

[0090] Figure 7 The diagram illustrates a method for setting up the PDCCH search space in a 3GPP NR system.

[0091] 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 PDCCH includes blind decoding of PDCCH candidates in the search space. When blind decoding is successful, it can be expressed as (successfully) detecting / receiving a PDCCH, and when blind decoding fails, it can be expressed as not detecting / receiving or not successfully detecting / receiving a PDCCH.

[0092] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI known by a UE previously is referred to as a group common (GC) PDCCH or a common PDCCH to transmit DL control information to one or more UEs. Also, a PDCCH scrambled with a specific terminal's RNTI known by a specific UE is referred to as a PDCCH for the specific UE to transmit UL scheduling information or DL scheduling information to the specific UE. The common PDCCH can be included in a common search space, and the UE-specific PDCCH can be included in the common search space or a UE-specific search space.

[0093] The base station can signal information (i.e., a DL grant) about resource allocation for a paging channel (PCH) and a downlink shared channel (DL-SCH) as a transport channel or information (i.e., a UL grant) about resource allocation for an uplink shared channel (UL-SCH) and a hybrid automatic repeat request (HARQ) to each UE or a group of UEs through a PDCCH. The base station can transmit a PCH transport block and a DL-SCH transport block through a PDSCH. The base station can transmit data excluding specific control information or specific service data through a PDSCH. Also, the UE can receive data excluding specific control information or specific service data through a PDSCH.

[0094] The base station can include information about to which UE (one or more UEs) PDSCH data is transmitted and how the PDSCH data is to be received and decoded by the corresponding UE in a PDCCH and transmit the PDCCH. For example, it is assumed that DCI transmitted through a specific PDCCH is CRC-masked with an RNTI 'A' and the DCI indicates that a PDSCH is allocated to a radio resource 'B' (e.g., a frequency location) and indicates transport format information 'C' (e.g., a transport block size, a modulation scheme, coding information, etc.). The UE monitors the PDCCH using RNTI information that the UE has. In this case, if there is a UE that performs blind decoding of the PDCCH using the 'A' RNTI, the UE receives the PDCCH and receives the PDSCH indicated by 'B' and 'C' through the information of the received PDCCH.

[0095] Table 2 shows an embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0096] [Table 2]

[0097] PUCCH format Length 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

[0098] The PUCCH can be used to transmit the following UL control information (UCI).

[0099] - Scheduling Request (SR): information for requesting UL UL-SCH resources.

[0100] - HARQ-ACK: a response to PDCCH (indicating DL SPS release) and / or a response to a DL transport block (TB) on PDSCH. The HARQ-ACK indicates whether information transmitted on PDCCH or PDSCH is received. The HARQ-ACK response includes a positive ACK (referred to as ACK), a negative ACK (hereinafter, NACK), a discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. In general, ACK can be represented by a bit value of 1, and NACK can be represented by a bit value of 0.

[0101] - Channel State Information (CSI): feedback information about a DL channel. The UE generates it based on a CSI-reference signal (RS) transmitted by the base station. Multiple-input multiple-output (MIMO)-related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). The CSI can be divided into CSI part 1 and CSI part 2 according to information indicated by the CSI.

[0102] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, various channel environments, and frame structures.

[0103] PUCCH format 0 is a format that can transmit 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on a time axis and one PRB on a frequency axis. When PUCCH format 0 is transmitted through two OFDM symbols, the same sequence on the two symbols can be transmitted through different RBs. Here, the sequence can be a sequence that is cyclic-shifted (CS) from a base sequence used in PUCCH format 0. In this way, the user equipment can obtain a frequency diversity gain. In more detail, the user equipment can determine a cyclic shift (CS) value m bit bits of UCI (M bit = 1 or 2) to 1. cs In addition, a sequence obtained by cyclic-shifting a base sequence having a length of 12 based on the determined CS value m cs may be mapped to 12 REs of one OFDM symbol and one RB to be transmitted. When the number of cyclic shifts available to the user equipment is 12 and M bit = 1, 1-bit UCI 0 and 1 can be mapped to two cyclic shift sequences whose cyclic shift values differ by 6, respectively. In addition, when M bitWhen MUCI=2, 2-bit UCI 00, 01, 11, and 10 can be mapped to four cyclic shift sequences whose cyclic shift values differ by 3, respectively.

[0104] PUCCH format 1 can deliver 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 can be transmitted through one PRB on a frequency axis and consecutive OFDM symbols on a time axis. Here, the number of OFDM symbols occupied by PUCCH format 1 can be one of 4 to 14. More specifically, the UE can modulate M bit = 1-bit UCI with BPSK. The UE can modulate M bit = 2-bit UCI with QPSK. The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a length-12 sequence. In this case, the sequence can be a base sequence used for PUCCH format 0. The UE transmits the obtained signal by time-axis orthogonal cover code (OCC) spreading even-numbered OFDM symbols to which PUCCH format 1 is assigned. PUCCH format 1 determines the maximum number of different UEs multiplexed in one RB according to the length of the OCC to be used. A demodulation reference signal (DMRS) can be spread with the OCC and mapped to odd-numbered OFDM symbols of PUCCH format 1.

[0105] PUCCH format 2 can deliver more than 2-bit UCI. PUCCH format 2 can be transmitted through one or two OFDM symbols on a time axis and one or more RBs on a frequency axis. When PUCCH format 2 is transmitted in two OFDM symbols, sequences transmitted in different RBs through the two OFDM symbols can be identical to each other. Here, the sequence can be a plurality of modulated complex-valued symbols d(0),..., d(M symbol-1 ) Here, M symbol may be M bit / 2. Through this, the UE can obtain frequency diversity gain. More specifically, M bit -bit UCI (M bit > 2) is bit-level scrambled, QPSK-modulated, and mapped to the RB of one or two OFDM symbols. Here, the number of RBs can be one of 1 to 16.

[0106] PUCCH format 3 or PUCCH format 4 can deliver more than 2-bit UCI. PUCCH format 3 or PUCCH format 4 can be transmitted through consecutive OFDM symbols on a time axis and one PRB on a 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 modulates Mbit one bit UCI (M bit ) is modulated to generate complex-valued symbols d(0) to d(M symb-1 ). Here, when π / 2-BPSK is used, M symb = M bit , and when QPSK is used, M symb = M bit / 2. The UE can not apply block-wise spreading for PUCCH format 3. However, the UE can apply block-wise spreading for one RB (i.e., 12 subcarriers) using PreDFT-OCC of length 12, so that PUCCH format 4 can have two or four multiplexing capability. The UE performs transmit precoding (or DFT precoding) on the spread signal and maps it to each RE to transmit the spread signal.

[0107] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 can be determined according to the length of UCI transmitted by the UE and the maximum coding rate. When the UE uses PUCCH format 2, the UE can transmit HARQ-ACK information and CSI information together through the PUCCH. When the number of RBs that the UE can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the UE can transmit only the remaining UCI information according to the priority of the UCI information without transmitting some UCI information.

[0108] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured by an RRC signal to indicate frequency hopping in a slot. When frequency hopping is configured, the index of the RB to be frequency-hopped can be configured by an RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted through N OFDM symbols in the time axis, the first hop can have floor(N / 2) OFDM symbols and the second hop can have ceiling(N / 2) OFDM symbols.

[0109] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted can be configured by an RRC signal. The repeatedly transmitted PUCCH must start from the OFDM symbol at a constant position in each slot and have a constant length. When one of the OFDM symbols among the OFDM symbols of the slot in which the UE should transmit the PUCCH is indicated as a DL symbol by an RRC signal, the UE can not transmit the PUCCH in the corresponding slot and delay the transmission of the PUCCH to the next slot to transmit the PUCCH.

[0110] Meanwhile, in the 3GPP NR system, a user equipment can perform transmission / reception using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). To this end, the user can receive a configuration of a bandwidth part (BWP) configured with a partial continuous bandwidth in the carrier bandwidth. A user equipment operating according to a TDD or in an unpaired spectrum can receive a configuration of up to four pairs of DL / UL BWPs in one carrier (or cell). Also, the user equipment can activate one pair of DL / UL BWPs. A user equipment operating according to an FDD or in a paired spectrum can receive up to four DL BWPs in a downlink carrier (or cell) and up to four UL BWPs in an uplink carrier (or cell). The user equipment can activate one DL BWP and one UL BWP per carrier (or cell). The user equipment can not receive or transmit in time-frequency resources other than the activated BWP. The activated BWP can be referred to as an active BWP.

[0111] A base station can indicate an activated BWP among the configured BWPs for a user equipment through downlink control information (DCI). The BWP indicated through the DCI is activated, and the other configured BWPs are deactivated. In a carrier (or cell) operating according to a TDD, the base station can add a bandwidth part indicator (BPI) indicating a BWP to be activated to DCI scheduling a PDSCH or a PUSCH to change a pair of DL / UL BWPs of the user equipment. The user equipment can receive the DCI scheduling the PDSCH or the PUSCH and can identify a pair of DL / UL BWPs activated based on the BPI. In the case of a downlink carrier (or cell) operating according to an FDD, the base station can add a BPI indicating a BWP to be activated to DCI scheduling a PDSCH to change a DL BWP of the base station. In the case of an uplink carrier (or cell) operating according to an FDD, the base station can add a BPI indicating a BWP to be activated to DCI scheduling a PUSCH to change a UL BWP of the base station.

[0112] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0113] Carrier aggregation is a method in which a UE uses a plurality of frequency blocks or (logically) cells configured with UL resources (or component carriers) and / or DL resources (or component carriers) as one large logical frequency band so that a wireless communication system uses a wider frequency band. One component carrier can also be referred to as a term called a primary cell (PCell) or a secondary cell (SCell) or a primary SCell (PScell). However, hereinafter, for convenience of description, the term "component carrier" is used.

[0114] Reference Figure 8As an example of the 3GPP NR system, the entire system band can include a maximum of 16 component carriers, and each component carrier can have a bandwidth of a maximum of 400 MHz. A component carrier can include one or more physically contiguous subcarriers. Although it is shown in Figure 8 that each component carrier has the same bandwidth, this is merely an example, and each component carrier can have a different bandwidth. In addition, although each component carrier is shown as being adjacent to each other in the frequency axis, the drawing is shown in a logical concept, and each component carrier can be physically adjacent to each other, or can be spaced apart.

[0115] A different center frequency can be used for each component carrier. In addition, one common center frequency can be used in physically adjacent component carriers. Assuming that all component carriers are physically adjacent in the embodiment of Figure 8 , center frequency A can be used in all component carriers. In addition, assuming that respective component carriers are not physically adjacent to each other, center frequency A and center frequency B can be used in each component carrier.

[0116] When the total system band is extended by carrier aggregation, a frequency band for communication with each UE can be defined in units of component carriers. UE A can use 100 MHz as the total system band, and perform communication using all five component carriers. UEs B1 to B5 can perform communication using only a 20 MHz bandwidth and using one component carrier. UEs C1 and C2 can perform communication using a 40 MHz bandwidth and using two component carriers, respectively. The two component carriers can be logically / physically adjacent or not adjacent. UE C1 represents a case of using two non-adjacent component carriers, and UE C2 represents a case of using two adjacent component carriers.

[0117] Figure 9 is a diagram for explaining single carrier communication and multi-carrier communication. In particular, Figure 9 (a) shows a single carrier subframe structure and Figure 9 (b) shows a multi-carrier subframe structure.

[0118] Referring to Figure 9 (a), in an FDD mode, a general wireless communication system can perform data transmission or reception through one DL band and one UL band corresponding thereto. In another specific embodiment, in a TDD mode, a wireless communication system can divide a radio frame into UL time units and DL time units in the time domain, and perform data transmission or reception through the UL / DL time units. Referring to Figure 9(b), which is capable of aggregating three 20MHz component carriers (CCs) into each of the UL and the DL, enabling support of a bandwidth of 60MHz. Each CC can be adjacent or non-adjacent to each other in the frequency domain. Figure 9 (b) shows a case where the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetric, 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. A DL / UL CC allocated / configured to a specific UE through RRC can be referred to as a serving DL / UL CC of the specific UE.

[0119] The base station can perform communication with the UE by activating some or all of the serving CCs of the UE or deactivating some of the CCs. The base station is capable of changing the CCs to be activated / deactivated and 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 is not deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. One CC that is not deactivated by the UE is referred to as a primary CC (PCC) or a primary cell (PCell), and the CC that the base station is free to activate / deactivate is referred to as a secondary CC (SCC) or a secondary cell (SCell).

[0120] Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of DL resources and UL resources, i.e., a combination of DL CCs and UL CCs. A cell can be configured with DL resources only, or can be configured with a combination of DL resources and UL resources. When carrier aggregation is supported, the linkage between the carrier frequency of the DL resources (or DL CCs) and the carrier frequency of the UL resources (or UL CCs) can be indicated by system information. The carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is referred to as a PCell, and a cell corresponding to an SCC is referred to as an SCell. The carrier corresponding to the PCell in the DL is a DL PCC, and the carrier corresponding to the PCell in the UL is a UL PCC. Similarly, the carrier corresponding to the SCell in the DL is a DL SCC, and the carrier corresponding to the SCell in the UL is a UL SCC. According to the UE capability, a serving cell can be configured with one PCell and zero or more SCells. In the case of a UE in an RRC_CONNECTED state but not configured for carrier aggregation or not supporting carrier aggregation, only one serving cell is configured with a PCell only.

[0121] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" indicating a certain geographical area provided with a communication service by one base station or one antenna group. That is, one component carrier can also be referred to as a scheduling cell, a scheduled cell, a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, in order to distinguish the cell indicating a certain geographical area and the cell of carrier aggregation, in the present disclosure, the cell of carrier aggregation is referred to as a CC, and the cell of a geographical area is referred to as a cell.

[0122] Figure 10 is a diagram illustrating an example in which a cross-carrier scheduling technique is applied. When cross-carrier scheduling is set, a control channel transmitted through a first CC can schedule a data channel transmitted through the first CC or a second CC using a carrier indicator field (CIF). The CIF is included in DCI. In other words, a scheduling cell is set, and a DL grant / UL grant transmitted in a PDCCH region of the scheduling cell schedules a PDSCH / PUSCH of a scheduled cell. That is, there is a search region for a plurality of component carriers in the PDCCH region of the scheduling cell. The PCell can basically be the scheduling cell, and a specific SCell can be designated as the scheduling cell by an upper layer.

[0123] In Figure 10 In an embodiment of, it is assumed that three DL CCs are merged. Here, it is assumed that a DL component carrier #0 is a DL PCC (or a PCell), and a DL component carrier #1 and a DL component carrier #2 are DL SCCs (or SCells). Further, it is assumed that the DL PCC is set as a PDCCH monitoring CC. When cross-carrier scheduling is not configured through UE-specific (or UE group-specific or cell-specific) higher layer signaling, the CIF is disabled, and each DL CC is able to transmit only a PDCCH for scheduling its PDSCH according to the NR PDCCH rule without the CIF (non-cross-carrier scheduling, self-carrier scheduling). Meanwhile, if cross-carrier scheduling is configured through UE-specific (or UE group-specific or cell-specific) higher layer signaling, the CIF is enabled, and a specific CC (for example, a DL PCC) can use the CIF to transmit not only a PDCCH for scheduling a PDSCH of a DL CC A but also a PDCCH for scheduling a PDSCH of another CC (cross-carrier scheduling). On the other hand, a PDCCH is not transmitted in another DL CC. Accordingly, the UE monitors a PDCCH not including the CIF to receive a self-carrier scheduled PDSCH according to whether cross-carrier scheduling is configured for the UE, or monitors a PDCCH including the CIF to receive a cross-carrier scheduled PDSCH.

[0124] On the other hand, Figure 9 andFigure 10 FIG. 3GPP LTE-A system is illustrated, and the same or similar configuration can be applied to the 3GPP NR system. However, in the 3GPP NR system, Figure 9 and Figure 10 a subframe can be replaced with a slot.

[0125] Figure 11 is a block diagram illustrating a configuration of a UE and a base station according to an embodiment of the disclosure. In an embodiment of the disclosure, the UE can be implemented with 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. Further, in an embodiment of the disclosure, the base station controls and manages a cell (e.g., a macro cell, a femto cell, a pico cell, etc.) corresponding to a service area, and performs functions of signal transmission, channel designation, channel monitoring, self-diagnosis, relaying, etc. The base station can be referred to as a next-generation node B (gNB) or an access point (AP).

[0126] As shown in the drawings, the UE 100 according to an embodiment of the disclosure can include a processor 110, a communication module 120, a memory 130, a user interface 140, and a display unit 150.

[0127] First, the processor 110 can execute various instructions or processes within the UE 100 and process data. Further, the processor 110 can control the entire operation of each unit including the UE 100, and can control transmission / reception of data between the units. Here, the processor 110 can be configured to perform operations according to the embodiments described in the disclosure. For example, the processor 110 can receive slot configuration information, determine a slot configuration based on the slot configuration information, and perform communication according to the determined slot configuration.

[0128] Next, the communication module 120 can be an integrated module that performs wireless communication using a wireless communication network and performs wireless LAN access using a wireless LAN. To this end, the communication module 120 can include a plurality of network interface cards (NICs), such as cellular communication interface cards 121 and 122 and a license-exempt band communication interface card 123, in an internal or external form. In the drawings, the communication module 120 is shown as an integrated module as a whole, but each network interface card can be independently arranged according to a circuit configuration or usage, unlike the drawings.

[0129] The cellular communication interface card 121 can transmit or receive radio signals with at least one of the base station 200, the external device, and the server by using a mobile communication network and provide a cellular communication service in a first frequency band based on an instruction from the processor 110. According to an embodiment, the cellular communication interface card 121 can include at least one NIC module using a frequency band less than 6 GHz. The at least one NIC module of the cellular communication interface card 121 can independently perform cellular communication with at least one of the base station 200, the external device, and the server in a sub-6 GHz band supported by the corresponding NIC module in accordance with a cellular communication standard or protocol.

[0130] The cellular communication interface card 122 can transmit or receive radio signals with at least one of the base station 200, the external device, and the server by using a mobile communication network and provide a cellular communication service in a second frequency band based on an instruction from the processor 110. According to an embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band greater than 6 GHz. The at least one NIC module of the cellular communication interface card 122 can independently perform cellular communication with at least one of the base station 200, the external device, and the server in a above-6 GHz band supported by the corresponding NIC module in accordance with a cellular communication standard or protocol.

[0131] The unlicensed band communication interface card 123 transmits or receives radio signals with at least one of the base station 200, the external device, and the server by using a third frequency band that is an unlicensed band and provides an unlicensed band communication service based on an instruction from the processor 110. The unlicensed band communication interface card 123 can include at least one NIC module using an unlicensed band. For example, the unlicensed band can be a 2.4 GHz or 5 GHz frequency band. The 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, the external device, and the server in accordance with an unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0132] The memory 130 stores control programs used in the UE 100 and various data used therefor. Such control programs can include prescribed programs needed to perform wireless communication with at least one of the base station 200, the external device, and the server.

[0133] Next, the user interface 140 includes various input / output means provided in the UE 100. In other words, the user interface 140 can receive a user input using various input means, and the processor 110 can control the UE 100 based on the received user input. Furthermore, the user interface 140 can perform output based on an instruction from the processor 110 using various output means.

[0134] Next, the display unit 150 outputs various images on the display screen. The display unit 150 can output various display objects, such as content or a user interface executed by the processor 110, based on a control instruction from the processor 110.

[0135] In addition, the base station 200 according to an embodiment of the disclosure can include a processor 210, a communication module 220, and a memory 230.

[0136] First, the processor 210 can execute various instructions or programs and process internal data of the base station 200. In addition, the processor 210 can control the entire operation of each unit in the base station 200 and control transmission and reception of data between the units. Here, the processor 210 can be configured to perform operations according to the embodiments described in the disclosure. For example, the processor 210 can signal a slot configuration and perform communication according to the signaled slot configuration.

[0137] Next, the communication module 220 can be an integrated module that performs wireless communication using a wireless communication network and performs wireless LAN access using a wireless LAN. To this end, the communication module 120 can include a plurality of network interface cards, such as cellular communication interface cards 221 and 222 and a license-exempt band communication interface card 223, in an internal or external form. In the drawing, the communication module 220 is shown as an integrated module as a whole, but unlike the drawing, each network interface card can be independently arranged according to a circuit configuration or usage.

[0138] The cellular communication interface card 221 can transmit or receive radio signals with at least one of the base station 100, an external device, and a server by using a mobile communication network and provide a cellular communication service in a first frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 221 can include at least one NIC module that uses a frequency band less than 6 GHz. The at least one NIC module of the cellular communication interface card 221 can independently perform cellular communication with at least one of the base station 100, the external device, and the server in a frequency band less than 6 GHz supported by the corresponding NIC module in accordance with a cellular communication standard or protocol.

[0139] The cellular communication interface card 222 can transmit or receive radio signals with at least one of the base station 100, the external device, and the server by using a mobile communication network and provide a cellular communication service in a second frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 222 can include at least one NIC module using a frequency band of 6 GHz or more. The at least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the base station 100, the external device, and the server in a frequency band of 6 GHz or more supported by the corresponding NIC module in compliance with a cellular communication standard or protocol.

[0140] The license-exempt band communication interface card 223 transmits or receives radio signals with at least one of the base station 100, the external device, and the server by using a third frequency band that is a license-exempt band, and provides a license-exempt band communication service based on an instruction from the processor 210. The license-exempt band communication interface card 223 can include at least one NIC module using a license-exempt band. For example, the license-exempt band can be a frequency band of 2.4 GHz or 5 GHz. The at least one NIC module of the license-exempt band communication interface card 223 can independently or dependently perform wireless communication with at least one of the base station 100, the external device, and the server in compliance with a license-exempt band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0141] Figure 11 FIG. 1 is a block diagram illustrating a UE 100 and a base station 200 according to an embodiment of the disclosure, and the separately illustrated blocks are logically divided elements of the devices. Accordingly, the aforementioned elements of the devices can be mounted in a single chip or a plurality of chips according to the design of the devices. Also, a part of the configuration of the UE 100, e.g., the user interface 140, the display unit 150, etc., can be selectively provided in the UE 100. Also, the user interface 140, the display unit 150, etc. can be additionally provided in the base station 200 if necessary.

[0142] In an NR wireless communication system, a user equipment can transmit a codebook including hybrid automatic repeat request (HARQ)-ACK information to signal whether reception of a downlink signal or channel is successful. The HARQ-ACK codebook includes one or more bits indicating whether reception of a downlink signal or channel is successful. Here, the downlink channel can include at least one of a physical downlink shared channel (PDSCH), a semi-persistent scheduling (SPS) PDSCH, and a PDCCH for releasing the SPS PDSCH. The HARQ-ACK codebook can be divided into a semi-static HARQ-ACK codebook (or a first type codebook) and a dynamic HARQ-ACK codebook (or a second type codebook). A base station can set one of the two HARQ-ACK codebooks for a user equipment. The user equipment can use the HARQ-ACK codebook set for the user equipment.

[0143] When using the semi-static HARQ-ACK codebook, the base station can use an RRC signal to configure the number of bits of the HARQ-ACK codebook and information of each bit of the HARQ-ACK codebook used to determine which downlink signal or channel is successfully received. Thus, the base station does not have to signal the information required to transmit the HARQ-ACK codebook to the user equipment every time the HARQ-ACK codebook needs to be transmitted.

[0144] When the dynamic HARQ-ACK codebook is used, the base station can signal information required to generate the HARQ-ACK codebook through the PDCCH (or DCI). In detail, the base station can signal information required to generate the HARQ-ACK codebook through a downlink assignment index (DAI) field of the PDCCH (or DCI). In certain embodiments, the DAI indicates information about the number of bits of the HARQ-ACK codebook and information about which channel or signal each bit of the HARQ-ACK codebook indicates reception success or failure for. The user equipment can receive the DAI field through the PDCCH (or DCI) for scheduling the PDSCH. The value of the DAI field can be divided into a counter-DAI and a total-DAI. The total-DAI indicates the number of downlink signals or channels, whose reception success or failure is indicated through the HARQ-ACK codebook, until the current monitoring occasion (MO). The counter-DAI indicates the HARQ-ACK codebook bit indicating reception success or failure of the downlink signal or channel among the downlink signals or channels, whose reception success or failure is indicated through the HARQ-ACK codebook, of the current cell until the current monitoring occasion. The PDCCH (or DCI) for scheduling the PDSCH can include the value of the counter-DAI corresponding to the scheduled PDSCH. Also, the PDCCH (or DCI) for scheduling the PDSCH can include the value of the total-DAI corresponding to the scheduled PDSCH. The user equipment can determine the number of bits of the dynamic HARQ-ACK codebook based on the information signaled by the PDCCH (or DCI). In detail, the user equipment can determine the number of bits of the dynamic HARQ-ACK codebook based on the DAI of the PDCCH (or DCI).

[0145] Figure 12 is a flowchart illustrating an example of transmitting / receiving a physical uplink shared channel (PUSCH) according to an embodiment of the present application,

[0146] Referring to Figure 12 , the user equipment (UE) receives RRC configuration information including information for receiving downlink control information (DCI) from the base station (S12010).

[0147] For example, the RRC configuration information can include information about a search space and a control resource set (CORESET) for the user equipment to detect a PDCCH including downlink control information. Here, the information about the control resource set can include at least one of an identifier (ID) of a control resource set for the user equipment to detect a PDCCH including DCI, control channel element (CCE) configuration information, and duration or frequency resource information of the control resource set. Here, the information about the search space can include at least one of an identifier (ID) of a search space for the user equipment to detect a PDCCH including DCI, a format of DCI detectable in each search space, a detection duration, or resource information.

[0148] Thereafter, the user equipment can receive DCI by detecting a PDCCH in a monitoring occasion based on the RRC configuration information (S12020). The user equipment can obtain DCI by detecting a PDCCH in a specific search space of a monitoring occasion according to a type of service and / or data based on the RRC configuration information.

[0149] Here, for the DAI included in the DCI, different bits can be set according to a format of the DCI. For example, in the DCI format 1_0, the DAI can be set with 2 bits, and in the DCI format 1_1, the DAI can be set with 1 bit for a semi-static HARQ-ACK codebook and 2 bits for a dynamic HARQ-ACK codebook.

[0150] Table 3 shown below shows an example of bits of the DAI according to the DCI format.

[0151] [Table 3]

[0152]

[0153] Further, the user equipment can be allocated resources for receiving a PDSCH or transmitting a PUSCH through a PDCCH (or DCI).

[0154] Thereafter, the user equipment can receive a PDSCH or transmit a PUSCH to a base station through the allocated resources (S12030). If the user equipment has received a PDSCH from the base station, the user equipment can generate a HARQ-ACK codebook indicating ACK / NACK of the received PDSCH based on a DAI value included in a PDCCH (or DCI) for scheduling the PDSCH, and can add the generated HARQ-ACK codebook to uplink control information (UCI) to transmit it to the base station. Here, the PUSCH can be repeatedly transmitted between slots through resources allocated by the DCI.

[0155] The symbols allocated to the user equipment for repeating transmission of the PUSCH by the base station through the DCI can be allocated by the position of the starting symbol, the length of the allocated resource, and the number of repetitions, and when the allocated symbols are invalid or overlap with a specific symbol, the PUSCH can not be transmitted on the corresponding symbol or can be transmitted by multiplexing with a signal transmitted through the specific symbol.

[0156] For example, when the symbols for repeating transmission of the PUSCH overlap with the symbols for transmitting the PUCCH, the user equipment can transmit the PUSCH and the PUCCH to the base station by multiplexing the PUSCH and the PUCCH. In addition, when the symbols allocated for repeating transmission of the PUSCH overlap with the symbols described below, the corresponding symbols are determined (or identified) as invalid symbols, and repeating transmission of the PUSCH is not performed on the corresponding symbols.

[0157] - symbols of CORESET#0

[0158] - in the case of a half-duplex user equipment, symbols for transmitting a downlink signal of another cell and symbols on which SS / PBCH is transmitted

[0159] - a semi-static downlink symbol of a Pcell

[0160] - a gap symbol after a semi-static downlink symbol of a Pcell

[0161] - when a pattern of invalid symbols is indicated by the DCI to be applied, invalid symbols configured by a bitmap of RRC signaling

[0162] - symbols for receiving SS / PBCH

[0163] UL preemption indication

[0164] The preemption indication indicates an indicator that the base station has scheduled a downlink signal to another user equipment by pre-empting (or puncturing) some resources in the PDSCH that has been scheduled. Likewise, the base station can transmit an indicator for transmitting an uplink signal to another user equipment by pre-empting (or puncturing) some resources in the PUSCH that has been scheduled.

[0165] This is referred to as an UL pre-emption indication or an UL cancellation indication. The present invention relates to the design of the UL pre-emption indication and the operation of the user equipment that has received the UL pre-emption indication.

[0166] In an embodiment of the disclosure, a user equipment can be configured with an RRC signal to receive the UL preemption indication, and the UL preemption indication can be transmitted through a group common PDCCH. That is, the user equipment receives a configuration of a search space, a monitoring period, an RNTI value, and a duration for the UL preemption indication through the RRC signal, and the user equipment blindly decodes a DCI scrambled with the RNTI value and the duration. When the DCI scrambled with the RNTI value is found, the user equipment can determine that the DCI is the UL preemption indication.

[0167] The UL preemption indication can convey the following information. First, a reference UL resource can be determined as follows. The reference UL resource can include all PRBs of the UL BWP. When the monitoring period of the UL preemption indication is TINT, the reference UL resource of the UL preemption indication received at the m-th period can be determined by Mathematical Expression 1 shown below.

[0168] [Mathematical Expression 1]

[0169] {mT INT +1+Δ offset ,mT INT +2+Δ offset ,…,(m+1)T INT +1+Δ offset ,}

[0170] In Mathematical Expression 1, the offset value Δoffset can be configured with an RRC or can be determined as a fixed value. Preferably, the offset value can be a multiple of the number of symbols of a slot. In addition, the Δoffset value can be determined according to a PUSCH processing time. For example, when it is assumed that Tproc,2 is the minimum time taken to receive a PDCCH for scheduling a PUSCH and to generate the PUSCH, Δoffset can be a value that increases in proportion to the Tproc,2 value. For example, Δoffset can be given as a value of ceil(Tproc,2 / Symbol_duration). Here, Symbol_duration is the duration of one OFDM symbol. In addition, the user equipment can determine Δoffset considering a timing advance (TA). That is, when determining Δoffset, the user equipment can consider a time difference between an uplink (UL) frame boundary and a downlink (DL) frame boundary due to a TA value. In addition, in the reference UL resource, a downlink symbol can be excluded according to a semi-static DL / UL assignment configured through a cell-specific RRC signal. Furthermore, a flexible symbol positioned immediately after the above-described downlink symbol can be excluded. Here, the number of excluded flexible symbols can be 1, or can be configured in an RRC signal.

[0171] The UL preemption indication can divide the reference UL resource into N pieces to inform which symbol has been preempted (or punctured), and can use a bitmap indicated with 1 bit to indicate whether each piece has been preempted. Preferably, the length of the bitmap is 14 bits. Preferably, the reference UL resource can be divided into 14 parts on the time axis or 7 parts on the time axis, and each part can be divided into two parts on the frequency axis. Preferably, regarding the method of grouping symbols into N sets when the reference UL resource has S symbols, in an embodiment of the present application, the user equipment can be designed such that the difference between the number of symbols included in each set when N groups are configured is allowed to be at most 1.

[0172] The S symbols included in the reference UL resource can be assigned numbers 1, 2,..., S in time order. In this case, the N sets are configured as follows according to the above method. The first mod(S, N) sets among the total N sets can include ceil(S / N) symbols, and the remaining N-mod(S, N) sets can include floor(S / N) symbols. Here, mod(a, b) is a function that returns the remainder when "a" is divided by "b", ceil(x) is a function that returns the smallest integer among numbers greater than or equal to X, and floor(x) is a function that returns the largest integer among numbers less than or equal to X. Here, mod(S, N) can be expressed as S-floor(S / N)*N.

[0173] When the user equipment receives the UL preemption indication, the user equipment does not transmit the PUSCH corresponding to the symbols indicated as pre-empted by the UL preemption indication through the uplink. The user equipment can transmit the PUSCH through the symbols not indicated as pre-empted in the UL preemption indication. For a method of transmitting the PUSCH, when the user equipment performs transmission through the symbols other than the symbols indicated as pre-empted in the UL preemption indication, the user equipment can drop the PUSCH overlapping the pre-empted symbols without transmitting the PUSCH, and can transmit the PUSCH overlapping the non-pre-empted symbols. For another method, the user equipment can sequentially transmit the PUSCH on the transmittable symbols, and can drop the remaining PUSCH without transmitting the remaining PUSCH. When the user equipment receives the scheduled PUSCH on 14 symbols, and the UL preemption indication indicates that the fifth symbol has been pre-empted, the user equipment does not transmit the uplink signal on the fifth symbol. Instead, the user equipment needs to transmit the PUSCH through symbols 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14. The resource elements (REs) of the PUSCH to be transmitted by the user equipment can be divided into PUSCH#1, PUSCH#2, …, PUSCH#14 according to the OFDM symbols. That is, PUSCH#1 indicates the PUSCH REs transmitted in the PUSCH on the first OFDM symbol. The PUSCH transmitted through symbols 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14 can be PUSCH#1, PUSCH#2, PUSCH#3, PUSCH#4, PUSCH#6, PUSCH#7, PUSCH#8, PUSCH#9, PUSCH#10, PUSCH#11, PUSCH#12, PUSCH#13, and PUSCH#14 other than PUSCH#5. The PUSCH transmitted through symbols 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 can be PUSCH#1, PUSCH#2, PUSCH#3, PUSCH#4, PUSCH#5, PUSCH#6, PUSCH#7, PUSCH#8, PUSCH#9, PUSCH#10, PUSCH#11, PUSCH#12, and PUSCH#13 in this order, and can not transmit PUSCH#14.

[0174] When the user equipment receives the UL preemption indication, the user equipment can transmit the PUSCH that cannot be transmitted on the symbols indicated as pre-empted by the UL preemption indication on another resource. Here, the other resource is different from the scheduled PUSCH resource and is an uplink resource later in time than the scheduled PUSCH resource. For convenience, this resource is referred to as an additional resource. Preferably, the scheduled PUSCH and the additional resource have the same PRB in the frequency domain. In embodiments of the present application, the additional resource can be an uplink symbol according to the latest semi-static DL / UL assignment after the allocated PUSCH resource. In embodiments of the present application, the additional resource can be a flexible symbol or an uplink symbol according to the latest RRC configured semi-static DL / UL assignment after the allocated PUSCH resource. In embodiments of the present application, the additional resource can follow symbol A after the allocated PUSCH resource. Preferably, symbol A can be configured by a RRC signal or can be fixed.

[0175] In embodiments of the present application, when the PUCCH is not transmitted by the UL preemption indication or the PUCCH transmission fails, the user equipment can determine whether to retransmit the PUCCH according to the uplink control information (UCI) to be transmitted by the PUCCH. For example, when the transmission of the PUCCH is affected by the UL preemption indication (e.g., when the resource elements (REs) that are the time and frequency resources allocated for transmitting the PUCCH overlap with the REs that are the time and frequency resources indicated by the UL preemption indication), the user equipment can retransmit the PUCCH including the UCI on the additional resource according to the uplink control information (e.g., HARQ-ACK, etc.) included in the PUCCH, without transmitting the PUCCH on the resources overlapping with the resources indicated by the UL preemption indication.

[0176] In another embodiment of the present application, when the user equipment has received a first PDCCH for scheduling the transmission of a first PUSCH at a first time point and a second PDCCH for scheduling the transmission of a second PUSCH at a second time point after the first time point, if the transmission of the first PUSCH and the transmission of the second PUSCH are scheduled for transmitting the same transport block (TB), the user equipment only transmits the second PUSCH scheduled by the second PDCCH without transmitting the first PUSCH scheduled by the first PDCCH.

[0177] Here, it can be determined whether the TBs to be transmitted through the first and second PUSCHs are the same based on the PDCCHs transmitted by the user equipment. In detail, when the HARQ process IDs of the DCIs included in the two PDCCHs, i.e., the first and second PDCCHs, so as to be transmitted are the same, and the values of the new data indicator fields indicating whether the data is new data are the same, the user equipment can recognize (or determine) that the TBs to be transmitted through the first and second PUSCHs are the same.

[0178] Whether to perform or cancel the transmission of the first PUSCH can be determined according to the PUSCH processing time of the user equipment. In detail, when part or all of the first PUSCH is scheduled to be transmitted between a specific time (or symbol) and the last symbol of the second PDCCH, the transmission of the first PUSCH cannot be canceled. That is, the user equipment can perform the transmission of the first PUSCH. In contrast, part or all of the first PUSCH after a specific time (or symbol) from the last symbol of the second PDCCH can not be transmitted.

[0179] In another embodiment of the present application, when the user equipment has received the first PDCCH for scheduling the transmission of the first PUSCH at a first time point, and has received the second PDCCH for scheduling the transmission of the second PUSCH at a second time point, if the two PUSCHs are scheduled to overlap and be transmitted on at least one symbol, the user equipment transmits the second PUSCH without performing the transmission of the first PUSCH. The user equipment can determine whether to perform the transmission for the untransmitted PUSCH according to the PUSCH processing time. In more detail, when part or all of the transmission of the PUSCH is scheduled between a specific time (or symbol) and the last symbol of the second PDCCH, this transmission cannot be canceled. That is, the user equipment can perform the transmission. In contrast, part or all of the PUSCH after a specific time (or symbol) from the last symbol of the second PDCCH is not transmitted.

[0180] However, when receiving a PDCCH for scheduling the transmission of a PUSCH including the same TB, canceling the entire previously scheduled PUSCH transmission in terms of frequency efficiency can be a waste of frequency. In addition, completely canceling the transmission of the scheduled PUSCH can cause a waste in terms of frequency efficiency. Furthermore, depending on the situation, it can be necessary to cancel the transmission of the PUSCH on some symbols for transmitting the PUSCH.

[0181] To solve this problem, the present application proposes a method of canceling only a part of a PUSCH according to a code block group (CBG) to be transmitted. In an embodiment of the present application, when the user equipment receives a configuration for CBG-based transmission from a higher layer, the user equipment can perform the following operations.

[0182] First, the user equipment can receive a configuration of the number of CBGs from a higher layer. The user equipment can receive a code block group transmission indicator (CBGTI) field having the same bit length as the configured number of CBGs in DCI format 0_1. The DCI format 0_1 is a DCI for scheduling a PUSCH. The CBGTI field can include a bitmap of CBGs to be transmitted, and the user equipment can identify CBGs to be transmitted through the bitmap of CBGs. The user equipment transmits CBGs indicated to be transmitted by the CBGTI field, but should not transmit CBGs not indicated to be transmitted.

[0183] In an embodiment of the disclosure, when the user equipment receives a first PDCCH for scheduling transmission of a first PUSCH at a first time point and a second PDCCH for scheduling transmission of a second PUSCH at a second time point after the first time point, the two PUSCHs can be scheduled to transmit the same transport block (TB). In this case, the same CBGs as those transmitted by being included in the PUSCH scheduled by the second PDCCH can be transmitted on the first PUSCH. During transmission of the first PUSCH, the user equipment can not perform transmission of a symbol to which the same CBG as that indicated to be transmitted on the PUSCH scheduled by the second PDCCH is mapped. Instead, during transmission of the first PUSCH, the user equipment can continue to transmit the remaining symbols except for the symbol to which the same CBG as that indicated to be transmitted on the PUSCH scheduled by the second PDCCH is mapped.

[0184] When scheduling the same TB, if the previously scheduled PUSCH is multiplexed with UCI, even if the user equipment receives the later scheduled PUSCH, the later scheduled PUSCH can be transmitted by being multiplexed with the UCI.

[0185] Specifically, when the same TB is included in the first PUSCH and the second PUSCH, and the user equipment receives the second PDCCH for scheduling the second PUSCH, the transmission of the first PUSCH scheduled by the first PDCCH can be cancelled. However, when the first PUSCH, which is scheduled earlier than the second PUSCH, is multiplexed with UCI, the UCI multiplexed with the first PUSCH is not transmitted unless the first PUSCH is transmitted, and thus, the user equipment cannot receive the UCI. Therefore, because the UCI cannot be transmitted to the base station if the first PUSCH is multiplexed with the UCI when a part or all of the previously scheduled PUSCH has not been transmitted, the user equipment can receive the second PDCCH and can multiplex the UCI with the second PUSCH to transmit the UCI to the base station. Here, the entire information of the UCI can be transmitted by being multiplexed with the second PUSCH, or only partial information can be transmitted by being multiplexed with the second PUSCH. The partial information can include HARQ-ACK information.

[0186] Alternatively, the user equipment can add information about the UCI multiplexing to a DCI field of the second PDCCH to transmit the information. The DCI field can exist explicitly for the UCI multiplexing, or can be inferred from the value of other DCI fields, which can include a beta offset indicator field.

[0187] Whether to perform the transmission of the second PUSCH for which the transmission of the first PUSCH is not performed can be determined according to a PUSCH processing time of the user equipment. In detail, when the PDCCH for cancelling the transmission of the PUSCH is received, and there is a transmission of a part or all of the PUSCH between a certain time (or symbol) and a last symbol of the PDCCH, the transmission of the first PUSCH can not be cancelled.

[0188] That is, even when the same TB is scheduled by the first PDCCH and the second PDCCH, the user equipment cannot cancel the transmission of the first PUSCH, and if a part or all of the first PUSCH is positioned after a certain time (or symbol) from a last symbol of the PDCCH, the user equipment can transmit the first PUSCH to the base station. In contrast, a part or all of the first PUSCH positioned after a certain time (or symbol) from the last symbol of the PDCCH can be cancelled and can not be transmitted.

[0189] Repetitive transmission of PUSCH

[0190] With respect to enhanced ultra-reliable low latency communication (eURLCC) developed in 3GPP NR Release 16, various techniques for providing highly reliable services with low latency time are discussed. In particular, in order to reduce latency time and increase reliability in the case of uplink, a method of supporting a user equipment to repeatedly transmit a physical uplink shared channel (PUSCH) to a base station as fast as possible will be supported. One aspect of the present invention discloses a method of a user equipment repeatedly transmitting a physical uplink shared channel to a base station as fast as possible.

[0191] Generally, a user equipment receives scheduling information about a PUSCH from a base station. This scheduling information about the PUSCH can be received from, for example, a PDCCH (or DCI). The user equipment transmits the PUSCH through an uplink based on the received scheduling information. Here, time domain resource assignment (TDRA) information and frequency domain resource assignment (FDRA) information for PUSCH transmission included in the DCI can be used to identify time-frequency resources on which the PUSCH is to be transmitted. The time-frequency resources on which the PUSCH is transmitted are configured in consecutive symbols, and one PUSCH can be scheduled without exceeding the boundary of a slot.

[0192] In 3GPP NR Release 15, time-slot-wise repetition transmission of PUSCH is supported. First, a user equipment can receive a configuration of a number of transmission repetitions from a base station. Assume that the user equipment receives a configured number of transmission repetitions of K. When the user equipment receives a PDCCH (or DCI) for scheduling a PUSCH on a slot n and is instructed to transmit the PUSCH on a slot n+k, the user equipment can transmit the PUSCH on K consecutive slots starting from the slot n+k. That is, the PUSCH can be transmitted on the slot n+k, the slot n+k+1,..., the slot n+k+K-1. Further, the time and frequency resources in which the PUSCH is transmitted in each slot are the same as indicated in the DCI. That is, the PUSCH can be transmitted on the same symbol and the same PRB in a slot. To obtain a diversity gain in the frequency domain, a user equipment can be configured with frequency hopping. The frequency hopping can be configured as intra-slot frequency hopping performed within a slot and inter-slot frequency hopping performed for each slot. If intra-slot frequency hopping is set for the user equipment, the user equipment divides the PUSCH of each slot into two halves to transmit one half on the scheduled PRB and the other half on the PRB obtained by adding an offset value to the scheduled PRB. Here, for the offset value, two or four values can be set through a higher layer, and one of the values can be indicated through the DCI. If inter-slot frequency hopping is set for the user equipment, the user equipment transmits the PUSCH on the scheduled PRB in the odd-numbered slots and transmits the PUSCH on the PRB obtained by adding an offset value to the scheduled PRB in the even-numbered slots. When transmission is repeatedly performed in a slot, the user equipment does not transmit the PUSCH in a specific slot in which a symbol in which the PUSCH is transmitted is configured as a semi-static downlink symbol. The PUSCH that cannot be transmitted is not postponed to another slot so as to be transmitted.

[0193] The above-described repetition transmission of Release 15 is not suitable for providing an eURLLC service for the following reasons.

[0194] First, it is difficult to provide high reliability. For example, when one slot is configured with 14 symbols, and the PUSCH is transmitted on symbol 12 and symbol 13, the PUSCH is repeatedly transmitted on symbol 12 and symbol 13 in the next slot as well. Although transmission on symbols 1 to 11 in the next slot is possible, this transmission is not performed, and thus it is difficult to achieve high reliability.

[0195] Second, it is difficult to provide a high degree of low latency. For example, assume that one slot is configured with 14 symbols, and the PUSCH is transmitted on symbols 0 to 13 to achieve high reliability. The base station needs to receive the last symbol, i.e., symbol 13, of the PUSCH to successfully receive the PUSCH. Thus, the latency increases as the length of the PUSCH increases.

[0196] To solve this problem, one aspect of the present application discloses a method of repeatedly transmitting a PUSCH within a slot. In more detail, a user equipment can continuously and repeatedly transmit a scheduled PUSCH. The term "continuously" means that the PUSCH is transmitted again on a symbol next to a symbol on which a previous PUSCH ends. This method can be referred to as a mini-slot level PUSCH repetition transmission or a PUSCH repetition Type B, and the above-mentioned repetition transmission method of the 3GPP NR Release 15 can be referred to as a slot level PUSCH repetition transmission method or a PUSCH repetition Type A.

[0197] In the case of the mini-slot level PUSCH repetition transmission, the above-mentioned problem of the slot level PUSCH repetition transmission method can be solved.

[0198] First, high reliability can be provided. For example, when one slot is configured with 14 symbols, and a PUSCH is transmitted on symbol 12 and symbol 13, the PUSCH can be repeatedly transmitted on symbol 1 and symbol 2 of the next slot. Thus, because transmission is performed immediately and continuously, high reliability can be achieved.

[0199] In addition, a high degree of low latency can be provided. For example, assuming that one slot is configured with 14 symbols, a PUSCH is transmitted on symbols 0 to 1 to achieve high reliability. Because repetition transmission is performed within a slot, transmission can be performed again on symbols 2 to 3, and repetition transmission can be performed on symbols 4 to 5. Thus, reliability can be achieved similar to that achieved when a PUSCH with a slot length of 14 is transmitted. However, in this case, a base station can not need to receive all of the repetition transmissions to receive successfully, and can receive successfully during the repetition transmissions according to a channel situation. Thus, according to circumstances, because transmission is successfully performed after symbol 2 on which the first repetition transmission ends, latency time can be reduced.

[0200] However, when a PUSCH is repeatedly transmitted, if a symbol used for repetition transmission of the PUSCH and a symbol used for transmission of a PUCCH overlap each other, the PUSCH to be repeatedly transmitted can be multiplexed with the PUCCH to transmit the PUCCH. In this case, it should be determined which PUSCH among the PUSCHs to be repeatedly transmitted is to be multiplexed with the PUCCH. That is, when resources for repetition transmission of the PUSCH and resources for transmission of the PUCCH overlap each other, the user equipment can select resources for multiplexing the PUCCH from among the resources allocated for repetition transmission of the PUSCH to multiplex and transmit the PUSCH and the PUCCH to the base station. Hereinafter, in the present application, a resource can include at least one of a symbol and a PRB.

[0201] Hereinafter, in the present application, each PUSCH through which the same TB is repeatedly transmitted is referred to as a PUSCH repetition, and the PUSCH includes all the PUSCH repetitions.

[0202] Further, hereinafter, with respect to the PUSCH repetition transmission of the present application, a nominal PUSCH repetition denotes resources for the repetition transmission of the PUSCH allocated by the base station through RRC configuration information and / or downlink control information (DCI), and an actual PUSCH repetition denotes resources configured with only valid symbols except for invalid symbols among the nominal PUSCH repetition.

[0203] Figures 13 to 18 is a diagram illustrating an example in which the PUSCH according to an embodiment of the present application includes four PUSCH repetitions.

[0204] Figure 13 is a diagram illustrating an example in which the PUSCH is repeatedly transmitted four times.

[0205] Reference Figure 13 When one user equipment receives a PDCCH for scheduling a PUSCH transmission from a base station, the user equipment can perform a PUSCH repetition transmission to repeatedly transmit the same TB to reduce a delay and increase reliability.

[0206] The PUSCH repetition can include a DMRS, and hereinafter, a description is provided under the assumption that all the PUSCH repetitions include the DMRS. As Figure 13 As illustrated in FIG. 1, resources for the repetition transmission of the PUSCH and resources for the transmission of the PUCCH can overlap each other. For example, as illustrated in FIG. 1, a PUCCH for transmitting a UCI can be configured in the second slot. Here, the resources (e.g., symbols) configured for transmitting the PUCCH can overlap with the resources (e.g., symbols) of the PUSCH repetitions for repeatedly transmitting the PUSCH. If the PUCCH overlaps with the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH repetition (PUSCH rep#3), because the user equipment cannot simultaneously transmit two channels, i.e., the PUCCH and the PUSCH, on one symbol, the user equipment can multiplex and transmit the PUSCH and the PUCCH. Hereinafter, a method for multiplexing the PUSCH and the PUCCH proposed in the present application will be described. Figure 13

[0207] (Proposal 1: One PUSCH repetition multiplexed with UCI of PUSCH to be transmitted)

[0208] ​When the PUSCH is repeatedly transmitted a plurality of times on a plurality of resources included in one or more slots, if a resource for repeatedly transmitting the PUSCH overlaps with a resource for transmitting the PUCCH, the user equipment can multiplex one of the PUSCH repetitions among the resources for the repeated transmission of the PUSCH with the UCI of the PUCCH to transmit it to the base station. Here, the resource can include at least one of a symbol and a PRB.

[0209] Method 1: Multiplexing with the earliest PUSCH repetition among the PUSCH repetitions, which is the resource of the PUSCH overlapping with the PUCCH.

[0210] Figure 14 FIG. illustrates an example of a method of multiplexing the UCI of the PUCCH with a first resource among the plurality of resources when the PUSCH is transmitted through the plurality of resources according to an embodiment of the present application.

[0211] Reference Figure 14 When the resource for transmitting the PUCCH and the resource for repeatedly transmitting the PUSCH overlap with each other on at least one symbol, the UCI to be transmitted through the PUCCH can be multiplexed and transmitted in the earliest PUSCH repetition in time among all the PUSCH repetitions of the PUSCH including the overlapping PUSCH repetition.

[0212] That is, the UCI, which is control information to be transmitted from the user equipment to the base station, can always be multiplexed on the earliest PUSCH repetition in time among all the PUSCH repetitions allocated for transmitting the PUSCH by the DCI from the base station. Here, the UCI cannot be multiplexed with other PUSCH repetitions. For example, as Figure 14 illustrated in FIG., when four PUSCH repetitions (PUSCH rep#0, PUSCH rep#1, PUSCH rep#2, and PUSCH rep#3) are configured for the transmission of the PUSCH, the PUCCH can overlap with the third PUSCH (PUSCH rep#2) as well as the fourth PUSCH repetition (PUSCH rep#3).

[0213] In this case, the UE transmits the UCI by multiplexing the UCI to be transmitted through the PUCCH with the PUSCH rep#0 (the first PUSCH repetition in time), and can not additionally transmit the PUCCH to the base station.

[0214] That is, the PUSCH is repeatedly transmitted through a plurality of resources in one or more slots, and the PUCCH for the UCI (e.g., HARQ-ACK, channel state information, etc.) can be transmitted through one slot. When one or more of the resources for the repeated transmission of the PUSCH overlap with the resource for the transmission of the PUCCH, the user equipment can multiplex the UCI with the foremost one among the resources for the repeated transmission of the PUSCH to transmit.

[0215] Method 2: Multiplexing with the earliest PUSCH repetition within the slot in which the PUCCH is transmitted among the PUSCH repetitions that are resources of the PUSCH overlapping with the PUCCH.

[0216] Figure 15 FIG. illustrates an example of a method of multiplexing the UCI of the PUCCH with the resource of the repeated transmission of the first PUSCH within the slot in which the PUCCH is transmitted when the PUSCH is transmitted through a plurality of resources according to an embodiment of the present application.

[0217] Reference Figure 15 When the resource for transmitting the PUCCH and the resource for repeatedly transmitting the PUSCH overlap with each other on at least one symbol, the UCI to be transmitted through the PUCCH can be multiplexed and transmitted in the earliest PUSCH repetition among the PUSCH repetitions of the PUSCH that overlap with the PUCCH in the slot in which the PUCCH is transmitted. That is, the PUSCH repetition including in the slot in which the PUCCH is to be transmitted is first selected from the PUSCH repetitions that are resources of the PUSCH allocated by the DCI of the base station to transmit the PUSCH, and the UCI can be multiplexed with the earliest PUSCH repetition among the selected PUSCH repetitions.

[0218] Here, the UCI can not be multiplexed with the PUSCH repetition of the slot other than the slot in which the PUCCH is transmitted, and the PUSCH repetition other than the foremost one in time among the PUSCH repetitions of the slot in which the PUCCH is transmitted can not be multiplexed with the UCI.

[0219] For example, as Figure 15 illustrated in FIG., when the PUCCH is transmitted in the second slot (slot #1), the second PUSCH repetition (PUSCH rep #1), the third PUSCH repetition (PUSCH rep #2), and the fourth PUSCH repetition (PUSCH rep #3) for the repeated transmission of the PUSCH are configured in the second slot, the resource for the transmission of the PUCCH can overlap with the resource for the repeated transmission of the PUSCH.

[0220] In this case, the PUCCH can overlap with a third PUSCH repetition (PUSCH rep#2) and a fourth PUSCH repetition (PUSCH rep#3) in the second slot, the UCI for the PUCCH can be multiplexed with a second PUSCH repetition (PUSCH rep#1) which is the earliest PUSCH repetition in time among the PUSCH repetitions in the second slot, and because the UCI is transmitted by multiplexing with the PUSCH, the user equipment can not additionally transmit the PUCCH.

[0221] Figure 16 FIGURE illustrates an example of a method of determining a subcarrier spacing of a resource for transmitting a PUCCH overlapping with a resource for transmitting a PUSCH and a slot according to the subcarrier spacing when the PUSCH is transmitted through a plurality of resources according to an embodiment of the present application.

[0222] If the subcarrier spacing of a cell in which the PUCCH is transmitted is different from the subcarrier spacing of a cell in which the PUSCH is transmitted, the slot in which the PUCCH is transmitted can be interpreted in two ways in Proposal 1. First, the slot in which the PUCCH is transmitted can be a slot determined according to the subcarrier spacing of the cell in which the PUCCH is transmitted. In addition, the PUSCH repetition overlapping with the slot in which the PUCCH is transmitted can be a PUSCH repetition included in the slot in which the PUCCH is transmitted. Second, the slot in which the PUCCH is transmitted can be a slot determined according to the subcarrier spacing of the cell in which the PUSCH overlapping with the PUCCH is transmitted.

[0223] For example, as Figure 16 illustrated in Proposal 1, when the subcarrier spacing of the PUCCH is determined using the first method, the PUSCH repetition in the slot in which the PUCCH is transmitted can be a third PUSCH repetition (PUSCH rep#2) and a fourth PUSCH repetition (PUSCH rep#3). However, when the subcarrier spacing of the PUCCH is determined using the second method, the PUSCH repetition in the slot in which the PUCCH is transmitted can be a second PUSCH repetition (PUSCH rep#1), a third PUSCH repetition (PUSCH rep#2), and a fourth PUSCH repetition (PUSCH rep#3).

[0224] Method 3: Multiplexed with the earliest PUSCH repetition among the PUSCH repetitions of the PUSCH overlapping with the PUCCH.

[0225] Figure 17FIGURE illustrates an example of a method of multiplexing UCI of a PUCCH on a first located resource among resources of a repeated transmission of a PUSCH overlapping a resource on which the PUCCH is transmitted when the PUSCH is transmitted through multiple resources according to an embodiment of the present application.

[0226] Reference Figure 17 When a resource for transmitting a PUCCH and a resource for repeatedly transmitting a PUSCH overlap each other on at least one symbol, UCI to be transmitted through the PUCCH can be multiplexed on a first in time PUSCH repetition among all PUSCH repetitions of the PUSCH overlapping the PUCCH to be transmitted. That is, a PUSCH repetition overlapping a symbol on which the PUCCH is to be transmitted is first selected from PUSCH repetitions allocated by a DCI of a base station as a resource to transmit the PUSCH. Thereafter, an earliest PUSCH repetition among the selected PUSCH repetitions can be multiplexed with UCI for the PUCCH.

[0227] In this case, the UCI can not be multiplexed on a PUSCH repetition not overlapping a resource of the PUCCH, and the UCI can not be multiplexed on a PUSCH repetition other than the earliest PUSCH repetition among PUSCH repetitions overlapping a symbol (resource) on which the PUCCH is transmitted.

[0228] For example, as Figure 17 illustrated in FIGURE, when a symbol of a resource on which the PUCCH is transmitted overlaps a third PUSCH repetition (PUSCH rep#2) and a fourth PUSCH repetition (PUSCH rep#3), the user equipment can multiplex the UCI to be transmitted to the base station through the PUCCH on the third PUSCH repetition (PUSCH rep#2) that is the earliest PUSCH repetition among the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH repetition (PUSCH rep#3). In this case, the user equipment can not additionally transmit the PUCCH.

[0229] In detail, a PUSCH for a specific repetition type (e.g., a PUSCH repetition type B) can be repeatedly transmitted on multiple resources (PUSCH repetitions) allocated in one or more consecutive slots, and a PUCCH for UCI, such as HARQ-ACK and / or CSI information, can be transmitted through a single slot overlapping PUSCH transmission in the one or more slots. In this case, the user equipment can multiplex the UCI on a first in time PUSCH repetition among multiple PUSCH repetitions included in the PUSCH overlapping the PUCCH transmission. Thereafter, the user equipment can transmit the PUSCH multiplexed with the UCI to the base station.

[0230] Here, the PUSCH repeat to be multiplexed with UCI may not be the nominal PUSCH repeat as a resource allocated by the base station, but may be the first PUSCH repeat in the actual PUSCH repeat that is determined by the user equipment as a valid symbol for the repeat transmission of PUSCH.

[0231] PUSCH repetition needs to meet specific conditions to be multiplexed with UCI. For example, an actual PUSCH repetition to be multiplexed with UCI needs to include more than one symbol and meet the processing time requirements for UCI multiplexing.

[0232] That is, only actual PUSCH repetitions that include more than one symbol, achieved by excluding invalid symbols from the nominal PUSCH repetitions, are resources used for retransmitting PUSCH allocated from the base station and can be multiplexed with UCI. In other words, the user equipment does not expect the actual PUSCH repetition to be multiplexed with PUCCH to be configured with one symbol.

[0233] Method 4: Repeat the earliest PUSCH in the PUSCH repetition that is the resource in which the PUSCH is to be sent in the time slot.

[0234] Specifically, when the resources for transmitting PUCCH and the resources for retransmitting PUSCH overlap with each other on at least one symbol, the UCI for PUCCH can be multiplexed onto a PUSCH repeat preceding a PUSCH repeat that overlaps with the time slot in which the PUCCH will be transmitted. That is, the user equipment can select a PUSCH repeat that overlaps with the time slot in which the PUCCH will be transmitted from among the PUSCH repeats used for retransmitting PUSCH. The user equipment can then multiplex the UCI onto the PUSCH repeat preceding the selected PUSCH repeat to transmit it to the base station. Here, the UCI may not be multiplexed onto PUSCH repeats that do not overlap with the time slot in which the PUCCH will be transmitted, and the UCI may not be multiplexed onto any PUSCH repeat other than the earliest PUSCH repeat that overlaps with the time slot in which the PUCCH will be transmitted.

[0235] For example, such as Figure 15As illustrated in the middle, the PUCCH can be transmitted on the resources of the second slot, and the second slot can overlap with the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3) in which the PUSCH is repeatedly transmitted. In this case, the UCI to be transmitted through the PUCCH can be multiplexed on the second PUSCH repetition (PUSCH rep#1) of the earliest located PUSCH repetition among the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3) which are the second slot, and the user equipment can not additionally transmit the PUCCH.

[0236] Method 5: Multiplexing with the nearest PUSCH repetition among PUSCH repetitions which are resources of the PUSCH overlapping with the PUCCH.

[0237] Figure 18 FIG. illustrates an example of a method of multiplexing UCI of a PUCCH with a nearest resource among a plurality of resources when a PUSCH is transmitted through the plurality of resources according to an embodiment of the present application.

[0238] Reference Figure 18 When the resources for transmitting the PUCCH and the resources for repeatedly transmitting the PUSCH overlap with each other on at least one symbol, the UCI can be transmitted by being multiplexed on the nearest PUSCH repetition in time among all the PUSCH repetitions of the PUSCH overlapping with the PUCCH in order to satisfy the processing time required for multiplexing the UCI of the PUSCH and the PUCCH. That is, the PUSCH repetition overlapping with the resource (or slot) on which the PUCCH is to be transmitted can be selected from the PUSCH repetitions for the repeated transmission of the PUSCH. Thereafter, the UCI can be multiplexed on the nearest PUSCH repetition among the PUSCH repetitions selected in time. The UCI can not be multiplexed on the PUSCH repetition not overlapping with the slot in which the PUCCH is to be transmitted, and the UCI can not be multiplexed on the PUCCH repetition other than the nearest PUSCH repetition among the PUSCH repetitions overlapping with the slot (or resource) in which the PUCCH is to be transmitted.

[0239] For example, as Figure 18As illustrated in the middle, the second slot in which the PUCCH is to be transmitted can overlap with the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3). In this case, the UCI to be transmitted through the PUCCH can be multiplexed on the fourth PUSCH repetition (PUSCH rep#3) of the last positioned PUSCH repetition among the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3) which are the second slot, and the user equipment can not additionally transmit the PUCCH.

[0240] In the methods 1 to 5 in Proposal 1, when the PUCCH overlaps with the PUSCH repetition, in selecting the PUSCH repetition as a resource for multiplexing the UCI, the following two issues can be considered.

[0241] First, the PUSCH repetition needs to satisfy a processing time for multiplexing the UCI with the PUSCH repetition. Specifically, in order to multiplex the UCI with the PUSCH repetition, a processing time until the multiplexing is completed is required. If there is a PUSCH repetition that does not satisfy the processing time, the PUSCH repetition that does not satisfy the processing time can be excluded, and the PUSCH repetition with which the UCI is to be multiplexed can be selected from among the PUSCH repetitions that satisfy the processing time.

[0242] If all the PUSCH repetitions do not satisfy the processing time for multiplexing, the PUSCH repetition can not be multiplexed with the UCI. In this case, the user equipment can transmit the UCI to the base station through the PUCCH without multiplexing the UCI with the PUSCH repetition, and can not transmit the PUSCH on the PUSCH repetition overlapping with the PUCCH.

[0243] The PUSCH that is not transmitted due to the transmission of the PUCCH can be transmitted after the transmission of the PUCCH.

[0244] Second, there can be a delay limitation condition for the UCI. That is, when there is a delay time limit for the transmission of the UCI within a fixed time, the user equipment can select the PUSCH repetition to multiplex the UCI with the selected PUSCH repetition only from among the PUSCH repetitions that satisfy such a delay time.

[0245] For example, when a delay time limit condition for transmitting UCI is configured as a specific value from a higher layer, the user equipment needs to transmit UCI to the base station within a delay time according to the configured specific value. Accordingly, the user equipment can exclude PUSCH repetitions that do not satisfy (violate) the delay time limit condition, and can select a PUSCH repetition to be multiplexed with UCI from among PUSCH repetitions that satisfy the delay time limit condition.

[0246] That is, UCI cannot be multiplexed on a PUSCH repetition positioned on a symbol other than a symbol given by a higher layer as a delay time limit condition.

[0247] (Proposal 2: Multiple PUSCH repetitions multiplexed with UCI of PUSCH to be transmitted)

[0248] When transmitting PUSCH multiple times repeatedly on multiple resources of one or more consecutive slots, if resources for repeatedly transmitting PUSCH overlap with resources for transmitting PUCCH, the user equipment can multiplex multiple PUSCH repetitions among resources for repeatedly transmitting PUSCH with PUCCH to transmit to the base station. Here, the resources can include at least one of a symbol and a PRB.

[0249] Method 0: Transmit UCI of PUCCH on all PUSCH repetitions of PUSCH overlapping with PUCCH

[0250] When resources for transmitting PUCCH and PUSCH repetitions overlap with each other on at least one symbol, UCI can be transmitted by multiplexing on all PUSCH repetitions of PUSCH overlapping with PUCCH. In other words, UCI can be transmitted by multiplexing on all repetitions of one or more PUSCHs included in one PUSCH.

[0251] Method 1: Transmit UCI of PUCCH on PUSCH repetitions overlapping with PUCCH

[0252] When resources for transmitting PUCCH and PUSCH repetitions overlap with each other on at least one symbol, UCI can be transmitted by multiplexing on all PUSCH repetitions overlapping with PUCCH. In other words, PUSCH repetitions overlapping with a symbol on which PUCCH is to be transmitted can be selected from among PUSCH repetitions of PUSCH, and UCI for PUCCH can be transmitted by multiplexing with the selected PUSCH repetitions. Here, PUSCH repetitions not overlapping with a symbol on which PUCCH is to be transmitted can not be multiplexed with UCI.

[0253] Method 2: Transmit UCI of PUCCH on all PUSCH repetitions included in a slot in which PUCCH is to be transmitted

[0254] When the resource for transmitting the PUCCH and the PUSCH repetition overlap each other on at least one symbol, the UCI for the PUCCH can be transmitted by being multiplexed on all the PUSCH repetitions of the slot in which the PUCCH is to be transmitted. In other words, the PUSCH repetition included in the slot in which the PUCCH is to be transmitted can be selected from among the PUSCH repetitions of the PUSCH, and the UCI for the PUCCH can be transmitted by being multiplexed with the selected PUSCH repetition. That is, the slot in which the PUCCH is to be transmitted can be selected from among the PUSCH repetitions of the PUSCH, and the UCI can be transmitted by being multiplexed on the PUSCH repetition included in the selected slot. Here, the PUSCH repetition of the slot in which the PUCCH is not transmitted can not be multiplexed with the UCI.

[0255] Method 3: Transmitting the UCI for the PUCCH by multiplexing on the foremost PUSCH repetition of each slot overlapping with the PUCCH

[0256] When the resource for transmitting the PUCCH and the PUSCH repetition overlap each other on at least one symbol, the slot in which the PUCCH is to be transmitted can be first selected in the cell in which the PUSCH is to be transmitted. Thereafter, the UCI can be transmitted by being multiplexed on the foremost PUSCH repetition in time among the PUSCH repetitions of each selected slot.

[0257] Method 4: Transmitting the UCI for the PUCCH by multiplexing on the foremost PUSCH repetition of each slot overlapping with the PUCCH slot

[0258] When the PUCCH and the PUSCH repetition for the repeated transmission of the PUSCH overlap each other on at least one symbol, the slot overlapping with the slot in which the PUCCH is to be transmitted can be first selected in the cell in which the PUSCH is to be transmitted. Thereafter, the UCI can be transmitted by being multiplexed on the foremost PUSCH repetition in time among the selected slots.

[0259] When the UCI is multiplexed on a plurality of PUSCH repetitions, the UCI can be transmitted by the following methods.

[0260] Method 1: When all the same UCI is multiplexed with a plurality of PUSCH repetitions, respectively, all the same UCI can be repeatedly transmitted in each PUSCH repetition. That is, if the user equipment receives the multiplexed UCI in one PUSCH repetition, the user equipment can successfully receive the UCI even if another PUSCH repetition is not received, because all the UCI is included in one PUSCH repetition.

[0261] Method 2: When UCI is multiplexed in multiple PUSCH repetitions, UCI can be transmitted by being divided as equally as possible among the PUSCH repetitions. That is, when UCI is multiplexed in multiple PUSCH repetitions, UCI can be transmitted by being divided into equal bits and included in the multiple PUSCH repetitions to be multiplexed.

[0262] Here, UCI can be equally multiplexed in the PUSCH repetitions so that a difference of at most 1 bit occurs. For example, when UCI includes HARQ-ACK, CSI Type 1, and CSI Type 2, UCI can be divided into X bits so as to be equally included in N PUSCH repetitions. Here, ceil(X / N) bits of UCI can be multiplexed with mod(X,N) PUSCH repetitions, and floor(X / N) bits of UCI can be multiplexed with N-mod(X,N) PUSCH repetitions.

[0263] Method 3: UCI can be transmitted by being divided as equally as possible among the PUSCH repetitions included in one slot. That is, UCI can be multiplexed by being divided into equal bits in the PUSCH repetitions included in the same slot, and UCI can not be divided among the PUSCH repetitions of different slots so as to be transmitted.

[0264] In another embodiment of the present application, when PUCCH and PUSCH overlap each other on at least one symbol, the user equipment can transmit PUCCH without transmitting PUSCH in the following cases.

[0265] First: When the priority of UL-SCH transmitted through PUSCH is lower than the priority of UCI transmitted through PUCCH, PUSCH overlapping with PUCCH can not be transmitted, and only PUCCH can be transmitted. Here, the priority can be indicated by PDCCH for scheduling PUSCH and PUCCH, and can be configured by a higher layer.

[0266] Second: When a resource for PUSCH for transmitting UCI by multiplexing UCI with PUSCH does not exist or is insufficient, PUSCH overlapping with PUCCH can not be transmitted, and only PUCCH can be transmitted. For example, when the DMRS symbol of PUSCH and 1 symbol of PUSCH are positioned on the last symbol of PUSCH, and it is necessary to multiplex UCI on the symbol next to the DMRS symbol, a resource for multiplexing and transmitting UCI does not exist. In this case, because UCI cannot be multiplexed with PUSCH, the user equipment can transmit PUCCH without transmitting PUSCH.

[0267] That is, when PUSCH repetition is multiplexed with UCI (e.g., HARQ-ACK and / or CSI information), the PUSCH repetition can be configured with two or more symbols. In other words, the user equipment can assume that the PUSCH repetition overlapping with the PUCCH includes at least one symbol.

[0268] When a resource for a PUSCH used to transmit UCI by multiplexing the UCI with the PUSCH does not exist or is insufficient (e.g., when 1 symbol of the PUSCH and a DMRS symbol of the PUSCH are positioned on the last symbol of the PUSCH, and the UCI needs to be multiplexed on a symbol next to the DMRS symbol), the UCI can be multiplexed with the PUSCH because there is no resource for transmitting the UCI. In this case, the user equipment can transmit the PUCCH on a resource overlapping with the PUCCH without transmitting the PUSCH. Alternatively, the user equipment can transmit the PUSCH on the resource without transmitting the PUCCH. Alternatively, a channel to be transmitted among the PUSCH and the PUCCH can be indicated to the user equipment through the PDCCH. For example, a channel indicated by a later transmitted PDCCH can be transmitted while the other channel can not be transmitted, or the channel to be transmitted can be determined through DCI transmitted by the PDCCH.

[0269] In detail, when a specific field included in DCI for scheduling the PUSCH indicates a specific codepoint, the PUCCH can not be transmitted and the PUSCH can be transmitted. Here, a specific codepoint can be indicated so that a value of beta_offset becomes 0. The beta_offset is a parameter indicated by a DCI field called a beta_offset indicator, and is used to determine the number of REs occupied when UCI of the beta_offset is multiplexed with the PUSCH.

[0270] In the above second method, when resources for transmitting UCI by multiplexing UCI with PUSCH do not exist or are insufficient in the symbols next to the DMRS symbol of PUSCH (for example, when there are no symbols next to the DMRS because the DMRS symbol of PUSCH is the last symbol of PUSCH, or when UCI cannot be transmitted while satisfying a sufficient code rate because the number of REs of the symbols is insufficient even though the symbols next to the DMRS symbol of PUSCH exist), UCI can be multiplexed using additional REs of the symbols positioned next to the DMRS symbol. For example, UCI is multiplexed by being sequentially mapped to the symbols after the symbol to which the DMRS of PUSCH is mapped, starting from the symbol next to the symbol to which the DMRS of PUSCH is mapped. When the REs required to multiplex UCI are insufficient while mapping UCI, UCI is multiplexed by being sequentially mapped to the symbols before the symbol to which the DMRS is mapped, starting from the symbol next to the symbol to which the DMRS is mapped to the previous symbol.

[0271] For another example, UCI can be multiplexed with PUSCH by alternately mapping UCI to the symbols after the symbol to which the DMRS is mapped and the symbols before the symbol to which the DMRS is mapped. That is, UCI is first mapped to the symbols next to the symbol to which the DMRS is mapped so as to be multiplexed. If the REs required to multiplex UCI are insufficient, UCI is mapped to the symbol next to the symbol to which the DMRS is mapped. Thereafter, when the REs required for multiplexing are still insufficient, UCI is multiplexed by being mapped to the next symbol of the symbol next to the symbol to which the DMRS is mapped. Thereafter, when the REs are still insufficient because not all of UCI is mapped, it can be multiplexed by being mapped to the previous symbol of the symbol next to the symbol to which the DMRS is mapped. As described above, UCI can be alternately mapped to the symbols before and after the symbol to which the DMRS is mapped. For another example, UCI can be multiplexed by being sequentially mapped to the symbols starting from the earliest symbol in time except for the symbol to which the DMRS is mapped.

[0272] If resources (for example, REs) not mapped to the DMRS exist in the symbol to which the DMRS is mapped, the resources can be used to multiplex UCI. For example, first, UCI can be multiplexed by being sequentially mapped to the symbols from the symbol next to the DMRS symbol to the following symbols. If the REs required to multiplex UCI are insufficient, UCI is multiplexed by being mapped to the REs not mapped to the DMRS in the symbol to which the DMRS is mapped. Thereafter, when the REs required for multiplexing are insufficient, UCI can be multiplexed by being sequentially mapped to the symbols before the symbol to which the DMRS is mapped, starting from the symbol next to the symbol to which the DMRS is mapped to the previous symbol.

[0273] In another embodiment, a plurality of UCI can be first mapped to the symbols next to the symbols to which DMRS is mapped. Thereafter, when REs for multiplexing UCI are insufficient, UCI can be multiplexed by mapping UCI to resources (e.g., REs) to which DMRS is not mapped in the symbols to which DMRS is mapped. If REs required for multiplexing UCI are insufficient, UCI can be multiplexed by mapping UCI to the symbols next to the symbols to which DMRS is mapped.

[0274] If REs required for multiplexing UCI are additionally required, UCI can be multiplexed by sequentially mapping to the symbols after the symbols next to the symbols to which DMRS is mapped and the symbols before the symbols next to the symbols to which DMRS is mapped. As described above, UCI can be alternately mapped to the symbols after the symbols to which DMRS is mapped and the symbols before the symbols to which DMRS is mapped.

[0275] In another embodiment, UCI can be multiplexed by sequentially mapping to the symbols starting from the earliest symbol in time among all symbols.

[0276] Another problem to be addressed by the present disclosure relates to a method of transmitting UCI when a PUCCH for transmitting HARQ-ACK having a low priority overlaps with a PUCCH for transmitting a scheduling request (SR) having a high priority on at least one symbol.

[0277] In NR Rel-15, when a PUCCH for transmitting SR and a PUCCH for transmitting HARQ-ACK overlap with each other on at least one symbol, the following operations are performed.

[0278] In the case of SR having PUCCH format 0 + HARQ-ACK having PUCCH format 1, that is, when the resources of PUCCH format 0 for transmitting SR overlap with the resources of PUCCH format 1 for transmitting HARQ-ACK, the user equipment transmits HARQ-ACK with PUCCH format 1, and does not transmit SR with PUCCH format 0 (here, SR can be limited to positive SR). However, since SR has a high priority, not transmitting SR can not be the correct operation.

[0279] To address this situation, the following methods are proposed.

[0280] Method 1: Information of SR can be added to the remaining bits of PUCCH format 1 to be transmitted.

[0281] In detail, in the case of PUCCH format 1, information of up to 2 bits can be transmitted. If the HARQ-ACK is 1 bit, 1 bit remains. The SR transmitted through the PUCCH format 0 can be expressed with 1 bit. For example, 0 indicates a negative SR, and 1 indicates a positive SR. The 1-bit HARQ-ACK and the 1-bit SR can be connected to generate 2-bit information by adding the information of the SR to the remaining 1 bit of the PUCCH format 1, and the 2-bit HARQ-ACK and SR can be transmitted through the PUCCH format.

[0282] If the HARQ-ACK has 2 bits, the 2-bit HARQ-ACK can be bundled to have 1 bit, and the bundled 1-bit HARQ-ACK and the 1-bit SR can be connected so that information including the 2-bit HARQ-AC and the SR is generated. The generated information can be added to the PUCCH format 1 so as to be transmitted to the user equipment. Here, the HARQ-ACK bundling means that the 2-bit HARQ-ACK is set to 1 when both bits indicate ACK, and is set to 0 for other cases.

[0283] Method 2: According to the PUCCH format to be transmitted, the information of the HARQ-ACK and the SR can be differently determined. In detail, according to the PUCCH format 0, the information can be transmitted according to 12 cyclic shift (CS) values. In the case of a positive SR, the user equipment can transmit the PUCCH format 1 having a preset (or predetermined determined) CS value among the 12 CSs. In the case of a negative 2 SR, the PUCCH format 1 for transmitting the HARQ-ACK information can be transmitted to the base station as it is. In the case of a positive SR, the HARQ-ACK information and the SR information can be transmitted through the PUCCH format 0 having different CS values. Here, the case of 1-bit HARQ-ACK is described below.

[0284] The difference between the CS value corresponding to NACK and the CS value corresponding to ACK can be 6. Here, determining two CS values such that the difference therebetween is 6 can be the same as determining two farthest CS values. Further, the CS value corresponding to NACK can be a CS value not overlapping with the HARQ-ACK, and is used only for transmitting a positive SR.

[0285] Here, the case of 2-bit HARQ-ACK is described below.

[0286] The CS values corresponding to NACK, NACK, NACK, ACK, ACK, and ACK, NACK can sequentially have a difference of 3. Here, determining the four CS values so that the difference therebetween is 3 can be the same as determining the four most equal CS values.

[0287] In addition, the values of 2 bits of HARQ-ACK corresponding to two adjacent CS values among the four CS values can differ by at most 1 bit value only, and the CS value corresponding to NACK, NACK can be a CS value for transmitting only a positive SR without overlapping with HARQ-ACK. The base station first determines the PUCCH format transmitted through the uplink among PUCCH format 0 and PUCCH format 1. If it is determined that PUCCH format 0 has been transmitted, it can be identified that a positive SR has been transmitted, and if it is determined that PUCCH format 1 has been transmitted, it can be identified that a negative SR has been transmitted. That is, the type of SR can be identified according to the PUCCH format. Thereafter, HARQ-ACK information can be determined. For example, when PUCCH format 1 is transmitted, HARQ-ACK information can be determined by decoding PUCCH format 1, and when PUCCH format 0 is transmitted, HARQ-ACK information can be determined using the CS value of PUCCH format 0.

[0288] Another problem to be addressed by the present application is a case where an SR having a high priority and a PUSCH having a low priority overlap each other on at least one symbol. The following operation is defined in NR Rel-15. If a PUSCH is scheduled at an SR occasion (transmittable symbol in the case of a positive SR), the user equipment transmits the PUSCH without transmitting the SR. This is because the user equipment is already able to transmit information through the PUSCH, and thus does not need to transmit an SR for requesting information through the uplink. However, as described above, if the SR has a high priority, the SR transmission is required for the high-priority uplink transmission in addition to the PUSCH that has been scheduled to be transmitted. For this, the following method is proposed.

[0289] Some resources in the scheduled PUSCH can be reserved as resources for SR transmission. In addition, the PUSCH does not use the resources for SR transmission, and performs rate matching or puncturing on the corresponding resources. The resources for SR transmission can be determined as follows.

[0290] First, resources for SR transmission can be reserved in the same symbol as the SR occasion. For example, when resources for SR transmission are positioned in even-numbered symbols of a slot, some resources of the PUSCH can be reserved as SR transmission resources in even-numbered symbols. That is, resources for SR transmission can be reserved in the PUSCH using the period of the SR occasion. Resources for SR transmission can be reserved in the PUSCH in the same period as the SR occasion. In addition, some resources of the PUSCH, which are the same number of symbols as the symbols of the SR occasion, can be reserved as resources for SR transmission.

[0291] In addition, in the case of positive SR, on the resources for SR transmission, an SR having the same PUCCH format as that transmitted in the SR occasion can be transmitted. If the resources reserved for SR transmission overlap with resources used as DMRS of the PUSCH, the resources reserved for SR transmission can be discarded. That is, this resource can not be reserved for SR transmission.

[0292] In another embodiment, the user equipment can transmit a DMRS on a symbol other than the resources for SR transmission, and can use PRBs positioned on the end side of the PUSCH as PRBs of the resources reserved for SR transmission. For example, the lowest indexed PRB or the highest indexed PRB can be used. In another embodiment, the PRBs of the resources reserved for SR transmission can be the PRBs most adjacent to the SR occasion.

[0293] In another embodiment of the present application, when resources for PUCCH mapped from a user equipment to a base station overlap or collide with resources of another PUCCH, multiple pieces of UCI of each PUCCH can be transmitted through multiplexing or through a new PUCCH resource. That is, a method of selecting a new PUCCH resource when UCI includes time-sensitive information is proposed.

[0294] Method 1: When resources for transmitting PUCCH overlap or collide with each other, the user equipment can select PUCCH resources for transmitting multiple pieces of UCI in one slot through the following method. In the first step, the user equipment excludes PUCCH resources of symbols after the last symbol of resources mapped to PUCCH for transmitting UCI (or UCI having high priority) from PUCCH resources configured in the corresponding slot. That is, PUCCH resources later than the end of UCI of URLLC can be excluded.

[0295] Thereafter, in a second step, the user equipment sequentially checks whether it is possible to transmit a plurality of pieces of UCI on PUCCH resources in a certain order among PUCCH resources in which the last symbol is positioned before or at the same position of the last symbol of a PUCCH resource for transmitting UCI (or UCI having a high priority). Here, the certain order can be determined based on the number of REs included in each PUCCH and the modulation order and / or code rate.

[0296] Specifically, the certain order can be determined as an ascending order of values obtained by multiplying the number of REs, the modulation order, and the code rate. If the lengths of the plurality of pieces of UCI to be transmitted are smaller than the size of bits that can be transmitted through the PUCCH, it can be determined that the plurality of pieces of UCI can be transmitted on the PUCCH resources.

[0297] The PUCCH resource for transmitting a plurality of pieces of UCI in one slot can be selected from among PUCCH resources other than PUCCH resources that do not satisfy a processing timeline. Through this process, the user equipment can select one PUCCH resource to transmit a plurality of pieces of UCI.

[0298] Method 2: When resources for transmitting PUCCH overlap or collide with each other, the user equipment can select a PUCCH resource for transmitting a plurality of pieces of UCI in one slot through the following method. In a first step, the user equipment selects the earliest symbol among the last symbols of PUCCH resources configured in the corresponding slot. In a second step, the user equipment selects a PUCCH resource corresponding to the symbol selected in the first step. If two or more PUCCH resources correspond to the selected symbol, the PUCCH resources can be ordered in a certain order. Here, the certain order can be determined in the same manner as in Method 1. Thereafter, a PUCCH resource for transmitting UCI can be selected from among the PUCCH resources ordered in the certain order.

[0299] The user equipment can transmit UCI on the selected PUCCH resource selected through the first and second steps. If the user equipment cannot transmit UCI on the selected PUCCH (for example, when the selected PUCCH resource exceeds the code rate and does not satisfy the processing time of the user equipment, or does not satisfy the delay condition of the UCI), the user equipment can select one PUCCH resource among PUCCH resources other than the corresponding PUCCH resource through the first and second steps. Through these steps, the user equipment can select one PUCCH resource to transmit UCI.

[0300] Method 3: The user equipment can transmit UCI by selecting a PUCCH resource for multiplexing a plurality of pieces of UCI other than URLLC UCI (or UCI having a high priority).

[0301] Method 3 uses a scheme of Rel-15. According to the scheme of Rel-15, time-domain overlapping PUCCH resources are ordered in ascending order based on a value obtained by multiplying the number of REs, the modulation order, and / or the code rate in the PUCCH resource, and it is sequentially determined whether UCI transmission is possible on the PUCCH resource.

[0302] In this way, the first PUCCH resource for multiplexing and transmitting multiple pieces of UCI other than the URLLC UCI (or UCI having a high priority) and the second PUCCH through which the URLLC UCI (or UCI having a high priority) is transmitted can be multiplexed as follows. First, when the first PUCCH resource ends earlier than or simultaneously with the second PUCCH resource (for example, when the last symbol of the first PUCCH resource is the same as or precedes the last symbol of the second PUCCH resource), and the URLLC UCI of the second PUCCH resource can be multiplexed with the first PUCCH resource, the user equipment can multiplex the URLLC and multiple pieces of UCI of the first PUCCH resource to transmit both on the first PUCCH resource. In this case, the first PUCCH resource needs to satisfy the processing time for transmitting the URLLC UCI. Otherwise, the URLLC UCI cannot be multiplexed with the UCI of the first resource.

[0303] If the first PUCCH resource ends later than the second PUCCH resource (for example, when the last symbol of the first PUCCH resource is positioned after the last symbol of the second PUCCH resource), and multiple pieces of UCI cannot be multiplexed with the first PUCCH resource, the user equipment can transmit the URLLC resource through the second PUCCH resource without transmitting the first PUCCH resource.

[0304] The present application provides a method of transmitting SR and HARQ-ACK when HARQ-ACK is scheduled to be transmitted through PUCCH format 0 of 2 symbols in a case where a corresponding PUCCH overlaps with two PUCCHs for SR transmission. Here, the format of the PUCCH for transmitting the SR can include PUCCH format 0. In Rel-15 NR, when one PUCCH for transmitting the SR overlaps in time with PUCCH format 0 for transmitting HARQ-ACK, the following method can be used to transmit the SR and UCI.

[0305] When HARQ-ACK is transmitted through 1 bit of PUCCH, and the PUCCH for transmitting the SR overlaps with the PUCCH for transmitting HARQ-ACK, if the SR is a negative SR, the HARQ-ACK can be transmitted as one of 9 (NACK) and 6 (ACK) as a cyclic shift value.

[0306] When the PUCCH for transmitting the SR overlaps with the PUCCH for transmitting the HARQ-ACK and the SR is the positive SR, the user equipment can transmit one of 3 (NACK + positive SR) and 9 (ACK + positive SR) as the cyclic shift value to the base station. That is, when the positive SR overlaps with the HARQ-ACK, the user equipment can add 3 to the CS value to transmit the CS value for the case where the negative SR overlaps with the HARQ-ACK.

[0307] When the HARQ-ACK is transmitted by 2 bits of the PUCCH, and the PUCCH for transmitting the SR overlaps with the PUCCH for transmitting the HARQ-ACK, the HARQ-ACK can transmit one of 0 (NACK, NACK), 3 (NACK, ACK), 6 (ACK, ACK), and / or 9 (ACK, NACK) as the cyclic shift value. When the SR overlaps with the HARQ-ACK and is the positive SR, the UCI can be transmitted by the cyclic shift value. For example, one of 1 (NACK, NACK, positive SR), 4 (NACK, ACK, positive SR), 7 (ACK, ACK, positive SR), and / or 10 (ACK, NACK, positive SR) can be transmitted as the cyclic shift value, and the HARQ-ACK and the SR can be identified according to the transmitted cyclic shift value. In this case, the CS value of the positive SR can be a value obtained by adding 1 to the CS value of the negative SR case in the case of overlapping with the positive SR.

[0308] Rel-15 NR does not consider the case where two or more SRs and the PUCCH format 0 for transmitting the HARQ-ACK overlap with each other in the time domain. However, it is necessary to configure a shorter period of the SR through the uplink to provide the URLLC service of Rel-16. Therefore, when the PUCCH format 0 for transmitting the HARQ-ACK is a 2-symbol format, it can overlap with the PUCCH for transmitting two SRs. In this case, a method of transmitting two SRs and the HARQ-ACK is required.

[0309] Method 1: One of the two SRs can be transmitted together with the HARQ-ACK, and the other SR can be discarded without being transmitted. In addition, the one SR and the HARQ-ACK can be transmitted using the CS value in the same manner as used in Rel-15. The SR among the two SRs to be transmitted together with the HARQ-ACK can be determined by the following three methods.

[0310] 1) The IDs of the SRs can be used to determine the SRs to be transmitted with the HARQ-ACK and the SRs to be discarded without transmission. For example, the SR with a lower ID can be determined as the SR to be always transmitted, or the SR with a higher ID can be determined as the SR to be always transmitted.

[0311] 2) The allocation information of the time domain can be used to determine the SR to be transmitted. For example, the PUCCH earlier in the time domain among the PUCCHs for transmitting two SRs, respectively, can be determined as the SR to be always transmitted. In contrast, the SR of the PUCCH later in the time domain among the PUCCHs for transmitting two SRs, respectively, can be determined as the SR to be always transmitted.

[0312] 3) The SR to be transmitted can be determined according to the priority of the SR. The priority of the SR can be set by a higher layer (e.g., RRC signaling). The user equipment can determine the SR always having a high priority as the SR to be always transmitted.

[0313] Method 2: The two SRs and the HARQ-ACK can be distinguished by CS so as to be transmitted. When the HARQ-ACK is 2 bits, the two SRs and the HARQ-ACK can be transmitted using CS by the following method. Here, the HARQ-ACK value of 0 indicates NACK, and the HARQ-ACK value of 1 indicates ACK.

[0314] The first SR and the second SR can be determined according to 1) ascending order of the SR ID, 2) ascending order of the symbol of the PUCCH for transmitting the SR, or 3) ascending order of the priority of the SR. That is, when the first SR among the two SRs is positive, the CS obtained by adding 1 to the CS value for transmitting a negative SR can be transmitted in the same manner as the method of transmitting the SR and the 2-bit HARQ-ACK in the above-described Rel-15, and, when the second SR is positive, the CS obtained by adding 2 to the CS value for transmitting a negative SR can be transmitted.

[0315] Table 4 below shows an example of the CS value according to the SR and the HARQ-ACK.

[0316] [Table 4]

[0317] HARQ-ACK value {0,0} {0,1} {1,1} {1,0} Sequence cyclic shift if first SR is positive m CS = 1 m CS = 4 m CS = 7 m CS = 10 Sequence cyclic shift if second SR is positive m CS = 2 m CS = 5 m CS = 8 m CS = 11

[0318] When the HARQ-ACK is 1 bit, two SRs and 1 bit of HARQ-ACK can be transmitted using a CS value determined according to whether the SR is positive or negative. For example, when the first SR among the two SRs is positive, a value obtained by adding 3 to a CS value for transmitting a negative SR can be transmitted in the same manner as a method of transmitting an SR and 1 bit of HARQ-ACK in Rel-15, and when the second SR is positive, a value obtained by adding 4 to the CS value for transmitting a negative SR can be transmitted.

[0319] Table 5 below shows an example of a CS value according to SR and HARQ-ACK.

[0320] [Table 5]

[0321] HARQ-ACK value 0 1 Sequence cyclic shift if first SR is positive m CS = 3 m CS = 9 Sequence cyclic shift if second SR is positive m CS = 4 m CS = 0

[0322] Through this method, that is, PUCCHs for transmitting SR and HARQ-ACK, respectively, overlap each other, information about HARQ-ACK and SR can also be transmitted to the user equipment through a CS value, and the user equipment can identify whether the HARQ-ACK is ACK or NACK and whether the SR is positive or negative through the received SR value.

[0323] <Proposal 3: Repetition of PUSCH is performed only on valid symbols except for invalid special symbols on resources for repetition of PUSCH>

[0324] Figures 19 to 22 FIG. 1 is a diagram illustrating an example of a slot format for repetition transmission of PUSCH according to an embodiment of the present application.

[0325] Figure 19 FIG. 2 is a diagram illustrating an example of allocating resources for repetition transmission of PUSCH.

[0326] Referring to Figure 19 The resources for repetition transmission of PUSCH can be allocated by transmitting a starting symbol index and an allocated resource length from the base station.

[0327] Specifically, the base station transmits resource allocation information for a time domain of a first PUSCH repetition for repetition transmission of PUSCH to the user equipment. The resource allocation information can include a starting symbol index S, a symbol length L, and a repetition number K. The user equipment determines a symbol for the PUSCH repetition transmission based on the resource allocation information. Here, a next PUSCH repetition can be continuously transmitted on a symbol next to the first PUSCH repetition. That is, in Figure 19In this case, a first PUSCH repetition (repetition #0) for the repetition transmission of the PUSCH is determined based on the resource allocation information, and on the next symbol, a second PUSCH repetition (repetition #1) for the repetition transmission can be determined.

[0328] When a PUSCH repetition for the repetition transmission of the PUSCH exceeds a boundary of a slot, the PUSCH repetition can be divided based on the boundary of the slot.

[0329] In addition, when one PUSCH repetition overlaps with a downlink symbol or an SS / PBCH block configured by a semi-static UL / DL configuration, the PUSCH repetition can transmit the PUSCH repetition on a symbol that does not overlap with the downlink symbol. In addition, the user equipment can also exclude a flexible symbol next to the downlink symbol configured by the semi-static UL / DL configuration from the PUSCH repetition.

[0330] For example, as illustrated in Figure 19 In this case, a first PUSCH repetition (repetition #0) for the repetition transmission of the PUSCH is determined based on the resource allocation information, and on the next symbol, a second PUSCH repetition (repetition #1) for the repetition transmission can be determined.

[0331] This method can cause a disadvantage that the number of symbols of one PUSCH repetition is too small when the PUSCH repetition is divided at the boundary of the slot. To solve this problem, in an embodiment of the present application, if a PUSCH repetition is configured with only one symbol, the user equipment can not transmit this PUSCH repetition. This is because when a PUSCH repetition is configured with only one symbol, data other than DMRS cannot be transmitted on the symbol. In addition, when the number of symbols transmitted by a PUSCH repetition is less than or equal to the number of DMRS symbols to be transmitted in the PUSCH repetition, the user equipment can not transmit the corresponding PUSCH repetition.

[0332] Figure 20 is a diagram illustrating another example of allocating resources for repetition transmission of the PUSCH.

[0333] Referring to Figure 20 , resources for repetition transmission of the PUSCH can be differently configured according to the boundary of the slot.

[0334] Specifically, the base station transmits resource allocation information for time domain of repeated transmission of PUSCH to the user equipment. The resource allocation information can include a starting symbol index S, a symbol length L, a repetition number K. The user equipment confirms whether L*K symbols from the starting symbol exceed a slot boundary. If the L*K symbols do not exceed the slot boundary, a first PUSCH repetition can be configured with L symbols from the starting symbol, and thereafter, K-1 PUSCH repetitions can successively start after the first PUSCH repetition and can occupy L symbols.

[0335] If the L*K symbols from the starting symbol exceed the slot boundary, the user equipment can divide the PUSCH repetition of the L*K symbols based on the slot boundary. For example, as illustrated in Figure 20 , when the user equipment is given resource allocation information indicating a starting symbol index of PUSCH as 4, a length as 4, and a transmission repetition number as 5, because 20 symbols from the starting symbol index 4 exceed the slot boundary, the user equipment can divide the 20 symbols based on the slot boundary. Accordingly, in Figure 20 , two PUSCH repetitions can be transmitted.

[0336] Figure 21 is a diagram illustrating another example of allocating resources for repeated transmission of PUSCH.

[0337] Referring to Figure 21 , when the resources allocated for repeated transmission of PUSCH include a slot boundary, the PUSCH can not be transmitted on the boundary.

[0338] Specifically, the base station transmits resource allocation information for time domain of repeated transmission of PUSCH to the user equipment. The resource allocation information can include a starting symbol index S, a symbol length L, a repetition number K. The user equipment determines symbols on which to transmit PUSCH repetitions for repeated transmission of PUSCH based on the resource allocation information. That is, as illustrated in Figure 21 , a first PUSCH repetition (repetition #0) can be determined based on the starting symbol index and the symbol length included in the resource allocation information. Thereafter, the next PUSCH repetition can be successively transmitted on the symbols next to the first PUSCH repetition.

[0339] However, because only two symbols are included in a slot after the second PUSCH repetition (repetition #1), two symbols need to be additionally allocated in the next slot beyond the slot boundary. That is, due to the slot boundary, two symbols are allocated to the first slot, and two symbols are additionally needed in the next slot. In this case, the user equipment can not transmit the PUSCH on the last two symbols of the previous slot and the first two symbols of the next slot as corresponding resources, and can resume the repeated transmission of the PUSCH in the third PUSCH repetition (repetition #2) allocated in the next symbol. That is, in Figure 21 , the last two symbols of the first slot (which can be transmitted by the third PUSCH repetition if transmission is possible at the slot boundary) and the first two symbols of the second slot overlap with the slot boundary, and thus are not transmitted.

[0340] Further, when one PUSCH repetition overlaps with a downlink symbol or an SS / PBCH block configured by a semi-static UL / DL configuration, the PUSCH repetition can transmit the PUSCH repetition on a symbol that does not overlap with the downlink symbol. Further, the user equipment can also exclude a flexible symbol next to the downlink symbol configured by the semi-static UL / DL configuration from the PUSCH repetition.

[0341] Figure 22 is a diagram illustrating another example of allocating resources for repeated transmission of a PUSCH.

[0342] Referring to Figure 22 , when a resource allocated for repeated transmission of a PUSCH includes a slot boundary, a symbol position on the slot boundary can be included in a previous PUSCH repetition and a next PUSCH repetition.

[0343] Specifically, a base station transmits resource allocation information of a time domain for repeated transmission of a PUSCH to a user equipment. The resource allocation information can include a start symbol index S, a symbol length L, and a repetition number K. The user equipment determines symbols on which to transmit a PUSCH repetition for repeated transmission of the PUSCH based on the resource allocation information.

[0344] Here, a next PUSCH repetition is continuously transmitted on a symbol next to a first PUSCH repetition (repetition #0). If a symbol allocated to one PUSCH repetition exceeds a slot boundary, the user equipment can divide the symbol allocated to the corresponding PUSCH repetition based on the slot boundary, and can include the divided symbols in adjacent PUSCH repetitions of the same slot. If there is no adjacent PUSCH repetition, the user equipment cannot transmit the PUSCH repetition on the above-described symbol.

[0345] For example, as Figure 22As illustrated in the middle, symbols allocated to the third PUSCH repetition exceed the slot boundary. The symbols can be divided into two groups according to the slot boundary, each group including two symbols, and the last two symbols of the first slot can be included in the previous PUSCH repetition (repetition #1), and the first two symbols of the second slot can be included in the next PUSCH repetition (repetition #2).

[0346] In Figures 19 to 22 In the middle, when determining a PUSCH repetition for a repeated transmission of a PUSCH, a downlink symbol and / or an SS / PBCH block configured by a semi-static UL / DL configuration of a cell in which the PUSCH repetition is transmitted is used. In addition, when a symbol described below overlaps with a symbol for a PUSCH repetition, a user equipment can consider the corresponding symbol as the same symbol as a symbol in which a downlink symbol and / or an SS / PBCH block configured by a semi-static UL / DL configuration of a cell in which the PUSCH repetition is transmitted overlaps.

[0347] That is, when a resource allocated for a PUSCH repetition overlaps with a specific symbol, the corresponding symbol can be identified as an invalid symbol, and a PUSCH repetition can be transmitted only on a valid symbol. Here, a resource allocated to a base station is referred to as a nominal PUSCH repetition, and a resource in which a PUSCH can be actually repeatedly transmitted is referred to as an actual PUSCH repetition excluding an invalid symbol from the nominal PUSCH repetition.

[0348] 1) Semi-static DL symbol and symbol for receiving SS / PBCH block

[0349] When a symbol allocated by resource allocation information for transmitting a PUSCH repetition overlaps with a downlink symbol configured by a semi-static UL / DL configuration, a user equipment can identify the corresponding symbol as an invalid symbol, and can transmit a PUSCH repetition on a symbol in which a downlink symbol configured by a semi-static UL / DL configuration does not overlap. In addition, a symbol (e.g., a flexible symbol, etc.) after a symbol indicated as a downlink by a semi-static UL / DL configuration can also be identified as an invalid symbol.

[0350] For example, a symbol indicated as a downlink by higher layer signaling (e.g., RRC configuration) can be considered as an invalid symbol for a PUSCH repetition. In addition, at least one symbol after a last symbol of a symbol indicated as a downlink can be considered as an invalid symbol. Here, the at least one symbol can be a gap symbol for changing a transmission direction from a downlink to an uplink.

[0351] Further, a symbol overlapping with a symbol for receiving an SS / PBCH block can also be considered as an invalid symbol. For example, a symbol indicated for receiving an SS / PBCH block through system information or configuration information can be considered as an invalid symbol for a PUSCH repetition.

[0352] 2) a symbol overlapping with CORESET#0

[0353] A symbol overlapping with CORESET#0 indicated through a PBCH is determined as an invalid symbol, and even if a base station allocates this symbol through a PUSCH transmission, a user equipment cannot repeatedly transmit a PUSCH on a symbol overlapping with CORESET#0. Here, CORESET#0 indicated through a PBCH should be used by a user equipment for initial cell access. Accordingly, a symbol in which CORESET#0 is configured is not to be used for transmission of an uplink channel or signal. Accordingly, through resource allocation information including a starting index and a length of a symbol to be transmitted by a user equipment from a base station, the user equipment can identify a nominal PUSCH repetition as a resource allocated for a repeated transmission of a PUSCH. Thereafter, the user equipment can identify a symbol related to CORESET#0 as an invalid symbol and can exclude this symbol from the nominal PUSCH repetition.

[0354] That is, a symbol of CORESET#0 as a resource set for an initial access procedure indicated by resource information transmitted from a base station can be identified as an invalid symbol.

[0355] For example, with respect to a PUSCH repetition of a specific type (e.g., Type B), a user equipment can determine a symbol invalid for a PUSCH repetition transmission. In detail, a symbol indicated as a search space of a specific type of PDCCH for detecting initial access in CORESET#0 as a CORESET for initial connection can be considered as a symbol invalid for transmitting a PUSCH repetition.

[0356] Here, CORESET#0 and a search space of a specific type of PDCCH for detecting initial connection can be indicated by a parameter of a master information block (MIB) or a system information block (SIB) received through a PBCH.

[0357] Here, a PDCCH monitored in CORESET#0 indicated by a PBCH can schedule a system information block and can be scrambled with an SI-RNTI.

[0358] That is, a symbol overlapping with CORESET#0 can be determined as an invalid symbol, such as a symbol in which a semi-static UL / DL configuration of a cell in which a PUSCH repetition is transmitted is indicated for downlink transmission or a symbol indicated for reception of an SS / PBCH, with reference toFigures 19 to 22 In the above description.

[0359] 3) Downlink symbols of another cell

[0360] When the user equipment has only half-duplex capability (i.e., when the user equipment is a user equipment that cannot simultaneously receive in one cell and transmit in another cell), if the reception of downlink channels and signals is indicated or set in another cell, the user equipment cannot transmit an uplink signal to the base station on a symbol overlapping with a symbol for receiving the downlink channels and signals. Therefore, when a symbol configured for PUSCH repetition is configured (or indicated) as a downlink symbol in another cell, a user equipment supporting only half-duplex capability will identify the corresponding symbol as an invalid symbol and not use this symbol for transmission of PUSCH repetition.

[0361] For example, a symbol overlapping with a symbol configured as a downlink symbol by a semi-static UL / DL configuration of a Pcell is an invalid symbol that cannot be used for PUSCH repetition transmission. Here, the Pcell (or primary cell) is a cell among carrier aggregation in which multiple cells are configured for a user equipment. A cell having the lowest index among the multiple cells can be referred to as a Pcell (or primary cell).

[0362] For example, when the user equipment satisfies the following conditions for supporting only half-duplex operation, if a symbol allocated by resource allocation information for PUSCH repetition transmitted from the base station overlaps with a symbol indicating reception of an SS / PBCH block in another cell, the user equipment can consider the corresponding symbol to be an invalid symbol.

[0363] In addition, a symbol overlapping with a symbol indicated as a downlink by configuration information of a higher layer in one cell or a symbol configured by one cell for reception of a downlink channel and a signal (e.g., CSI-RS, PDCCH, or PDSCH) can be considered to be an invalid symbol for PUSCH repetition transmission.

[0364] Alternatively, at least one of a symbol configured for reception of an SS / PBCH block of a cell different from a serving cell in which the user equipment will transmit PUSCH or a symbol configured for monitoring of a PDCCH in a CORESET #0 indicated by a PBCH can be considered to be an invalid symbol for PUSCH repetition transmission.

[0365] 4) Symbols configured by RRC

[0366] The user equipment can not transmit PUSCH repetition on a symbol configured by a higher layer parameter as an invalid symbol for PUSCH repetition transmission.

[0367] The user equipment can be configured with the pattern information on the invalid symbols for the PUSCH repetition in bitmap form through the parameters of the higher layer signal. Each bit of the bitmap form of the pattern indicates the validity of each symbol. For example, when the bit value of the bitmap is 1, this value indicates that the symbol corresponding to the bit value is an invalid symbol.

[0368] The pattern information on the invalid symbols configured by the higher layer can be applied by an indicator included in the DCI transmitted by the PDCCH. That is, the DCI can include an indicator indicating whether to apply the pattern information on the invalid symbols configured by the higher layer signal, and the user equipment can apply the pattern information on the symbols configured by the higher layer signal according to the value of the indicator received through the DCI.

[0369] For example, when the value of the indicator received by the DCI is 1, the user equipment can apply the pattern information on the invalid symbols, and can identify the symbols corresponding to each bit of the bitmap of the pattern information as symbols that are invalid for the PUSCH repetition transmission. The user equipment can transmit the PUSCH repetition on the symbols allocated for the PUSCH repetition, except for the symbols determined to be invalid symbols based on the pattern information.

[0370] 5) At least G symbols after the symbols corresponding to one of 1) to 4)

[0371] The G symbols positioned after the last symbol of the symbols corresponding to the above-described 1) to 4) and thus considered as invalid symbols can be identified as invalid symbols. For example, at least one of the G symbols (G is an integer) after the last symbol of the semi-static DL symbols described in 1), the symbols for receiving the SS / PBCH block, the G symbols after the last symbol of the symbols for monitoring the PDCCH in the CORESET#0 indicated by the PBCH described in 2), the G symbols after the last symbol of the downlink symbols of another cell when the user equipment supports only the half duplex operation described in 3), and the G symbols after the last symbol of the symbols configured as invalid symbols by the RRC described in 4) can be considered as symbols that are invalid for the PUSCH repetition transmission.

[0372] Here, the symbols of 2) to 5) can be determined among the symbols other than at least the symbols described in 1). That is, the symbols of 2) to 5) can be determined among the symbols configured as flexible symbols or uplink symbols through the semi-static UL / DL configuration of the cell in which the PUSCH repetition is transmitted or among all symbols when there is no semi-static UL / DL configuration. This is to prevent the symbols determined in 1) from overlapping with the symbols determined in 2) to 5).

[0373] As described above, the symbols that cannot be used for transmission of the PUSCH repetition can include at least one of the following symbols.

[0374] 1) Semi-static DL symbols and symbols for receiving SS / PBCH block

[0375] 2) Symbols overlapping with CORESET#0

[0376] 3) Downlink symbols of another cell

[0377] 4) Symbols configured as invalid symbols by RRC

[0378] 5) At least G symbols after the last symbol of the symbols corresponding to 1) to 4)

[0379] The user equipment can repeatedly transmit the PUSCH on actual PUSCH repetitions, which are resources obtained by excluding invalid symbols such as the above-described invalid symbols from nominal PUSCH repetitions, which are resources allocated for the PUSCH repetition by resource allocation information of the base station.

[0380] The five types of symbols described in 1) to 5) cannot be used for transmission of the PUSCH even if they correspond to symbols allocated by the base station for repeated transmission of the PUSCH, and can be distinguished according to whether it is the base station that performs scheduling / transmission as follows. Hereinafter, symbols corresponding to 1) to 5) are defined as an invalid symbol set.

[0381] The first type of invalid symbol set corresponds to a symbol set in which the user equipment is absolutely impossible to perform uplink transmission.

[0382] For example, the first type of invalid symbol set can be a symbol set configured with some of the symbols described in 1) among the symbols included in the invalid symbol set. The user equipment cannot perform uplink transmission on downlink symbols configured by a semi-static DL / UL configuration among the symbols corresponding to 1).

[0383] Alternatively, the first type of invalid symbol set can be a symbol set configured with some of the symbols described in 1) among the symbols included in the invalid symbol set. The symbols for receiving SS / PBCH blocks among the symbols corresponding to 1) can be included in the first type of invalid symbol set. Since the base station uses the symbols for receiving SS / PBCH blocks to perform downlink transmission, the user equipment needs to receive the SS / PBCH blocks on the corresponding symbols. Therefore, the user equipment cannot perform uplink transmission on the corresponding symbols.

[0384] Alternatively, the first type of invalid symbol set can be a symbol set configured with symbols corresponding to 3) among symbols included in the invalid symbol set. Because the symbols corresponding to 3) are used for receiving downlink symbols of one cell when the user equipment supports only half duplex operation, the user equipment supporting only half duplex operation cannot perform uplink transmission on the corresponding symbols.

[0385] Alternatively, the first type of invalid symbol set can be a symbol set configured with at least one of symbols corresponding to 1) or 3) among symbols included in the invalid symbol set. That is, at least one of the semi-static DL symbols described in 1) and symbols for receiving SS / PBCH blocks and / or symbols for transmitting downlink signals of a reference cell when the user equipment supports only half duplex operation described in 3) can be included in the first type of invalid symbol set. That is, the first type of invalid symbol set can be configured with all symbols corresponding to 1) and 3), or can be configured with only some symbols corresponding to 1) and 3).

[0386] The second type of invalid symbol set is a symbol set in which uplink transmission of the user equipment is not necessarily impossible (i.e., uplink transmission is possible according to circumstances).

[0387] For example, the second type of invalid symbol set can be a symbol set configured with symbols corresponding to 2) among the above invalid symbols. The above symbols corresponding to 2) indicate symbols for monitoring PDCCH in CORESET #0 indicated by PBCH. The base station can or can not transmit PDCCH in CORESET #0. Therefore, when the base station does not transmit PDCCH on the corresponding symbols, the user equipment can transmit an uplink signal on the symbols for monitoring PDCCH.

[0388] In addition, when the PDCCH has been detected, the user equipment can transmit an uplink signal on symbols after the symbols in which the PDCCH has been detected among the symbols for monitoring the PDCCH, and thus, the user equipment can repeatedly transmit PUSCH on the corresponding symbols.

[0389] Here, as described above, symbols for receiving 1) SS / PBCH blocks to symbols corresponding to 5) indicate symbols other than symbols in which the semi-static DL / UL configuration of a cell in which PUSCH repetition is transmitted is configured as downlink symbols.

[0390] In addition, the second type of invalid symbol set can be a symbol set configured with symbols corresponding to 5) among the above invalid symbols. The symbols corresponding to 5) indicate at least G symbols positioned after the last symbols corresponding to 1) to 4).

[0391] The symbol corresponding to 5) is a symbol for switching from downlink reception to uplink transmission (RX to TX switching) for uplink transmission after the user equipment receives the signal transmitted on the symbols corresponding to 1) to 4). However, because the user equipment does not always receive a downlink channel or signal on the symbols corresponding to 1) to 4), the symbol for switching from downlink reception to uplink transmission can not be necessary when a downlink channel or signal is not received.

[0392] For example, only when a downlink channel / signal is scheduled or configured, a downlink signal is transmitted and received on a symbol configured as a downlink symbol by the semi-static DL / UL configuration in 1), and thus, a downlink signal is not always transmitted on this symbol. Also, although the base station transmits an SS / PBCH block in 1), in a special case, the user equipment can skip reception of the SS / PBCH block without receiving the SS / PBCH block. Also in the case of 2), for a symbol for monitoring a PDCCH in CORESET #0 indicated by a PBCH, the base station can or can not transmit a PDCCH on the symbol for monitoring. Thus, in a specific case, the user equipment can skip a PDCCH on the corresponding symbol without receiving the PDCCH. Also, when the user equipment supports only a half duplex operation in 3), even if a downlink signal is transmitted in one cell, in a specific case, the user equipment can skip reception of the transmitted signal without receiving the signal. Also, also in the case of 4), because the base station configures a symbol as an invalid symbol, pattern information regarding the invalid symbol can not be applied by an indicator of a DCI through a higher layer signal, and a downlink signal can not be transmitted on the corresponding symbol. Thus, in this case, because a symbol for RX to TX switching is not necessary, the user equipment can perform uplink transmission on the corresponding symbol.

[0393] Alternatively, the second type invalid symbol set can be a symbol set configured with at least one of the symbols corresponding to 2) to 5) among the symbols included in the invalid symbol set. That is, the second type invalid symbol set can be configured with all symbols corresponding to 2) to 5), or can be configured with only some symbols corresponding to 2) to 5).

[0394] There is no symbol repeated between the first type invalid symbol set and the second type invalid symbol set, and the union set of the two symbol sets can be a set of all invalid symbols. That is, the second type invalid symbol set can include only symbols other than the symbols included in the first type invalid symbol set.

[0395] Preferably, the first type of invalid symbol set can be configured with symbols corresponding to 1) and 3) among the symbols included in the invalid symbol set, and the second type of invalid symbol set can be configured with symbols included in the invalid symbol set other than the symbols corresponding to the first type.

[0396] The base station can schedule a PUSCH repetition for a user equipment for a repeated transmission of a PUSCH. Here, a PDCCH (or DCI) for scheduling the PUSCH repetition can include a starting symbol index and a length of a first nominal PUSCH repetition, and can further include a number of repetitions of the transmission of the PUSCH repetition. The user equipment can receive the PDCCH (or DCI), and can obtain information on the number of repetitions of the transmission of the PUSCH repetition and a symbol in which the first nominal PUSCH repetition is scheduled based on the starting symbol index and the length of the received PDCCH (or DCI).

[0397] The user equipment can determine a symbol in which a second nominal PUSCH repetition having a length L is scheduled immediately after the symbol in which the first nominal PUSCH repetition is scheduled. Here, the length L is equal to the length of the first nominal PUSCH repetition. Further, the user equipment can determine a symbol in which a third nominal PUSCH repetition having a length L is scheduled immediately after the symbol in which the second nominal PUSCH repetition is scheduled. This process can be repeated until a symbol in which a corresponding PUSCH repetition is scheduled is determined based on the number of repetitions of the PUSCH repetition obtained from the PDCCH (or DCI).

[0398] The user equipment determines whether the determined symbol scheduled as a nominal PUSCH repetition overlaps with a symbol included in an invalid symbol set, and identifies an overlapping symbol as an invalid symbol to exclude this symbol from the scheduled symbol. That is, the user equipment does not transmit a PUSCH repetition on a symbol overlapping with the invalid symbol. The user equipment can determine an actual PUSCH repetition for an actual transmission of a PUSCH by grouping consecutive symbols not exceeding a slot boundary among symbols other than the overlapping symbol.

[0399] Some symbols corresponding to the invalid symbol set can be used for the transmission of the PUSCH repetition in a special case, but can always be excluded from the transmission of the PUSCH repetition. For example, it is preferable to exclude a symbol in which uplink transmission is necessarily impossible (a symbol included in the first type of invalid symbol set) among the symbols corresponding to 1) to 5) described above in the process of determining an actual PUSCH repetition for an actual transmission of a PUSCH. However, it is preferable to selectively exclude a symbol in which uplink transmission is not necessarily impossible (a symbol included in the second invalid symbol set) in a special condition during the process of determining an actual PUSCH repetition.

[0400] In the first embodiment of the present application, when a symbol in which the determined first nominal PUSCH repetition is scheduled overlaps with a symbol included in the first type of invalid symbol set, the user equipment excludes the corresponding symbol from the symbols in which the nominal PUSCH repetition is scheduled. However, a symbol overlapping with a symbol included in the second type of invalid symbol set is not excluded from the symbols in which the first nominal PUSCH repetition is scheduled. That is, the user equipment does not transmit the nominal PUSCH repetition only on the symbols overlapping with the first type of invalid symbol set. The user equipment can determine the actual PUSCH repetition for the actual transmission of the PUSCH by grouping the consecutive symbols not exceeding the slot boundary among the symbols other than the symbols overlapping with the first type of invalid symbol.

[0401] The user equipment excludes the nominal PUSCH repetition after the determined first nominal PUSCH repetition from the symbols in which the PUSCH repetition is scheduled and the symbols overlapping with the symbols included in the first type of invalid symbol set or the second type of invalid symbol set. That is, the user equipment does not transmit the nominal PUSCH repetition on the symbols overlapping with the first type of invalid symbol set and the symbols overlapping with the second type of invalid symbol set. The user equipment can determine the actual PUSCH repetition by grouping the consecutive symbols not exceeding the slot boundary among the symbols other than the symbols overlapping with the first type and the second type of invalid symbol set.

[0402] When the base station schedules the PUSCH repetition for the user equipment, the base station indicates the symbols allocated to the first nominal PUSCH repetition, and the next PUSCH repetition is determined by the symbols after the first nominal PUSCH repetition. Accordingly, the base station can indicate the symbols on which the first nominal PUSCH repetition is transmitted in the PDCCH (or DCI). If the symbols included in the second type of invalid symbol set cannot be used for the first nominal PUSCH repetition, the base station can indicate the first nominal PUSCH repetition on the symbols other than the symbols included in the second type of invalid symbol set. Conversely, the base station can schedule the first nominal PUSCH repetition on the symbols included in the second type of invalid symbol set. In this case, the symbols included in the second type of invalid symbol set can be available for the first nominal PUSCH repetition.

[0403] Figure 23 and Figure 24 is a diagram illustrating another example of a symbol in which the repetition transmission of the PUSCH cannot be performed according to an embodiment of the present application.

[0404] Figure 23 is a diagram illustrating an example of excluding an invalid symbol from the symbols allocated for the repetition transmission of the PUSCH in an embodiment of the present application.

[0405] Reference Figure 23 In the above invalid symbol set, among the symbols corresponding to 1), the symbols configured as downlink by the semi-static DL / UL configuration and the at least G symbols (G is assumed to be 2 in this embodiment) corresponding to 5) for switching from downlink to uplink can be excluded as invalid symbols.

[0406] Here, the symbols corresponding to 1) can belong to the first type, and the symbols corresponding to 5) can belong to the second type.

[0407] Reference Figure 23 (a), all symbols can be considered as invalid symbols and can be excluded from the nominal PUSCH repetition without distinguishing the first type and the second type. That is, from among the symbols in which a certain nominal PUSCH repetition is scheduled, the symbols overlapping with the symbols included in the invalid symbol set (the union set of the first type and the second type) can be excluded. For example, as illustrated in (a) of Figure 23 (a) of the above, the user equipment can receive a PDCCH (or DCI) for scheduling a PUSCH repetition from the base station. Here, the PDCCH (or DCI) can include at least one of the index value of the starting symbol of the first nominal PUSCH repetition (S = 5), the length (L = 5), and the repetition number (K = 3).

[0408] The first nominal PUSCH repetition (PUSCH rep#0) does not overlap with the invalid symbols of the first type (i.e., the semi-static downlink symbols), but overlaps with the symbols corresponding to 5) and belonging to the second type (i.e., the G = 2 symbols after the semi-static downlink symbols). Therefore, in the first nominal PUSCH repetition, the user equipment can determine three consecutive symbols except for the two symbols corresponding to 5) as the actual PUSCH repetition to be actually transmitted.

[0409] The second nominal PUSCH repetition (PUSCH rep#1) has the last symbol overlapping with the downlink symbols of the first type (i.e., the semi-static downlink symbols). Therefore, in the second nominal PUSCH repetition, the user equipment can determine four consecutive symbols except for one semi-static downlink symbol corresponding to the first type as the actual PUSCH repetition to be actually transmitted.

[0410] The third nominal PUSCH repetition (PUSCH rep#2) has the first two symbols overlapping with the symbols belonging to the first type and has the third and fourth symbols overlapping with the symbols corresponding to 5) of the second type. Therefore, in the third nominal PUSCH repetition, the user equipment can determine one consecutive symbol except for the symbols corresponding to 1) and 5) as the actual PUSCH repetition to be actually transmitted.

[0411] ReferenceFigure 23 of (b), the symbols included in the first type and the second type of invalid symbol set can be excluded differently. That is, among the symbols in which a certain nominal PUSCH repetition is scheduled, the symbols overlapping with the symbols included in the invalid symbol set (the union set of the first type and the second type) can be excluded differently. In other words, among the symbols in which the first nominal PUSCH repetition is scheduled, the symbols overlapping with the symbols included in the first type of invalid symbol set can be excluded. However, among the symbols in which the nominal PUSCH repetition subsequent to the first nominal PUSCH repetition is scheduled, the symbols overlapping with the symbols included in the first type and the second type of invalid symbol set can be excluded.

[0412] For example, as illustrated in (b) of FIG. 11, Figure 23 of (b), the user equipment can receive a PDCCH (or DCI) for scheduling a PUSCH repetition from a base station. Here, the PDCCH (or DCI) can include at least one of an index value of a starting symbol of the first nominal PUSCH repetition (S = 5), a length (L = 5), and a repetition number (K = 3).

[0413] The first nominal PUSCH repetition (PUSCH rep#0) does not overlap with the invalid symbols of the first type (i.e., the semi-static downlink symbols), but overlaps with the symbols corresponding to 5) and belonging to the second type (i.e., G = 2 symbols after the semi-static downlink symbols). In this case, because only the symbols corresponding to the first type are excluded from the scheduled symbols, the symbols (G = 2) corresponding to the second type of 5) are not excluded. Accordingly, the user equipment can determine five consecutive symbols of the first nominal PUSCH repetition as actual PUSCH repetitions to be actually transmitted.

[0414] The second nominal PUSCH repetition (PUSCH rep#1) has a last symbol overlapping with the invalid symbols of the first type (i.e., the semi-static downlink symbols). Accordingly, in the second nominal PUSCH repetition, the user equipment can determine four consecutive symbols except for one semi-static downlink symbol corresponding to the first type as actual PUSCH repetitions to be actually transmitted.

[0415] The third nominal PUSCH repetition (PUSCH rep#2) has the first two symbols overlapping with the symbols belonging to the first type and has the third and fourth symbols overlapping with the symbols corresponding to 5) of the second type. Accordingly, in the third nominal PUSCH repetition, the user equipment can determine one consecutive symbol except for the symbols corresponding to 1) and 5) as actual PUSCH repetitions to be actually transmitted. That is, in the third nominal PUSCH repetition, unlike in the second nominal PUSCH repetition, the gap symbol corresponding to 5) can be selectively applied as an invalid symbol.

[0416] In the second embodiment of the present application, a symbol among symbols included in a second type of invalid symbol set that overlaps with a symbol in which a first nominal PUSCH repetition is scheduled can be used for the first nominal PUSCH repetition, and in addition, in a nominal PUSCH repetition after the first nominal PUSCH repetition, a symbol to be used is determined according to a result of the first nominal PUSCH repetition.

[0417] That is, a symbol among symbols included in the second type of invalid symbol set that is scheduled and used in the first nominal PUSCH repetition can be regarded as a symbol used also in the next nominal PUSCH repetition.

[0418] For example, the second type of invalid symbol set can include the above-described symbol corresponding to 5). In the present embodiment, G symbols after a last symbol of a semi-static downlink symbol are exemplarily described as belonging to the second type of invalid symbol. If the first nominal PUSCH repetition is scheduled to overlap with some of the G symbols, the user equipment can not exclude the overlapping symbols among the G symbols from symbols in which the nominal PUSCH repetition is scheduled, and can use them for transmitting the nominal PUSCH repetition. Thereafter, when symbols allocated for the second nominal PUSCH repetition overlap with some of the G symbols, the user equipment needs to determine whether to exclude or use some of the G symbols overlapping with the second nominal PUSCH repetition.

[0419] Here, the G symbols can mean symbols that can be used as an RX to TX switching time for the user equipment to receive a downlink channel signal scheduled / configured on the semi-static downlink symbol and transmit an uplink channel / signal. Accordingly, when some of the overlapping symbols among the G symbols are used without being excluded in the first nominal PUSCH repetition, some of the overlapping symbols among the G symbols can also be used in the second nominal repetition.

[0420] Figure 24 is a diagram illustrating another example of excluding invalid symbols from symbols allocated for a repeated transmission of a PUSCH in an embodiment of the present application.

[0421] Referring to Figure 24 The second embodiment can be applied so that some symbols can be excluded from the PUSCH repetition. In Figure 24 The user equipment has received a PDCCH (or DCI) for scheduling a PUSCH repetition, in which the PDCCH (or DCI) indicates that an index (S) of a first symbol of a first (nominal) PUSCH repetition is 5, a length (L) is 3, and a repetition number is 2. The first 5 symbols of a slot are configured as downlink symbols by a semi-static DL / UL configuration, and the other symbols are configured as flexible or uplink symbols. In Figure 24In the invalid symbol set, the symbols corresponding to 1) (symbols configured as downlink symbols in a semi-static DL / UL configuration) and the symbols corresponding to 5) (at least 6 symbols following the last symbol of the symbol configured as a downlink symbol in a semi-static DL / UL configuration), assuming G is 4), are used as examples to provide a description. Here, the first type of invalid symbol set includes the symbols corresponding to 1), and the second type of invalid symbol set includes the symbols corresponding to 5).

[0422] exist Figure 24 In this context, all symbols can be considered invalid symbols and can be excluded from nominal PUSCH repeats without distinguishing between Type I and Type II. That is, from the symbols in which a nominal PUSCH repeat is scheduled, symbols that overlap with those included in the set of invalid symbols (the union of Type I and Type II) can be excluded. For example... Figure 24 As illustrated in (a), in the first nominal PUSCH repeat, if symbols overlapping with symbols corresponding to the first and second types are excluded, there are no remaining symbols. The first symbol of the second nominal PUSCH repeat overlaps with a symbol belonging to the second type. Therefore, in the second nominal PUSCH repeat, the user equipment can identify two consecutive symbols other than the one corresponding to (5) as the actual PUSCH repeat to be transmitted.

[0423] Unlike Figure 24 (a), in Figure 24 In (b), symbols belonging to the second type are not excluded from the first nominal PUSCH repeat. That is, the first nominal PUSCH repeat does not overlap with symbols corresponding to the first type, but rather with symbols corresponding to the second type. However, symbols corresponding to the second type can be used in the first nominal PUSCH repeat without being excluded. In this case, the three consecutive symbols included in the first nominal PUSCH repeat can be identified as the actual PUSCH repeat to be sent. The second nominal PUSCH repeat overlaps with symbols corresponding to the second type. However, since symbols corresponding to the second type have not been excluded from the first nominal PUSCH repeat, symbols corresponding to the second type are also not excluded from the second nominal PUSCH repeat. Therefore, the three consecutive symbols included in the second nominal PUSCH repeat can be identified as the actual PUSCH repeat to be sent.

[0424] <Proposal 4: Method for determining the parameter set of gap symbols>

[0425] When at least G symbols including 5) in the invalid symbol set are defined, a time point at which the G symbols start and a numerology of the G symbols (i.e., subcarrier spacing) can be determined. Hereinafter, a method of defining at least G symbols after the semi-static downlink symbol will be described with respect to scheme 4. However, this method can also be applied to at least one of at least G symbols after a symbol for receiving SS / PBCH, at least G symbols after a symbol for PDCCH monitoring of CORESET#0 indicated by PBCH, and at least G symbols after a downlink signal of another cell when the user equipment supports a half duplex operation. That is, this method can be applied to all of the above-described symbols corresponding to 5).

[0426] First, the time point at which the G symbols start can be defined as follows.

[0427] If the last time point of the last downlink symbol in the DL BWP (which is the same as the start time point of the next symbol of the last downlink symbol) is the same as the last time point of a certain uplink symbol of the UL BWP (which is the same as the start time point of the next symbol of the uplink symbol), the user equipment can determine the last time point as the time point at which the G symbols start.

[0428] If the last time point of the last downlink symbol in the DL BWP (which is the same as the start time point of the next symbol of the last downlink symbol) is different from the last time point of a certain uplink symbol of the UL BWP (which is the same as the start time point of the next symbol of the uplink symbol), the user equipment can determine the last time point of one symbol among uplink symbols overlapping the last downlink symbol as the time point at which the G symbols start. Here, the last time point of the last uplink symbol among the uplink symbols overlapping the last downlink symbol can be determined as the time point at which the G symbols start.

[0429] That is, the start symbol of the G symbols can be determined based on the last symbol of the symbols for uplink transmission.

[0430] For another example, the user equipment can determine the starting point of a symbol among the uplink symbols overlapping with the last downlink symbol as the point of G symbols starting if the last point in time of the last downlink symbol in the DL BWP (which is the same as the starting point of the next symbol of the last downlink symbol) is different from the last point in time of a certain uplink symbol of the UL BWP (which is the same as the starting point of the next symbol of the uplink symbol). Here, the starting point of the last uplink symbol among the uplink symbols overlapping with the last downlink symbol can be determined as the point of G symbols starting.

[0431] For another example, here, the starting point of the first symbol among the uplink symbols overlapping with the last downlink symbol can be determined as the point of G symbols starting.

[0432] If the last point in time of the last downlink symbol in the DL BWP (which is the same as the starting point of the next symbol of the last downlink symbol) is different from the last point in time of a certain uplink symbol of the UL BWP (which is the same as the starting point of the next symbol of the uplink symbol), the user equipment can determine the last point in time of a symbol among the uplink symbols overlapping with the next symbol of the last downlink symbol as the point of G symbols starting.

[0433] Here, the last point in time of the last symbol among the uplink symbols overlapping with the next symbol of the last downlink symbol can be determined as the point of G symbols starting. For another example, here, the last point in time of the first symbol among the uplink symbols overlapping with the next symbol of the last downlink symbol can be determined as the point of G symbols starting.

[0434] If the last point in time of the last downlink symbol in the DL BWP (which is the same as the starting point of the next symbol of the last downlink symbol) is different from the last point in time of a certain uplink symbol of the UL BWP (which is the same as the starting point of the next symbol of the uplink symbol), the user equipment can determine the starting point of a symbol among the uplink symbols overlapping with the next symbol of the last downlink symbol as the point of G symbols starting. Here, the starting point of the last symbol among the uplink symbols overlapping with the next symbol of the last downlink symbol can be determined as the point of G symbols starting.

[0435] For another example, here, the starting point of the first symbol among the uplink symbols overlapping with the next symbol of the last downlink symbol can be determined as the point of G symbols starting.

[0436] The numerology of G symbols (e.g., subcarrier spacing) can be determined as follows. For reference, the length of G symbols is determined according to the numerology, and the determined length of G symbols starts from the point in time where the G symbols determined from the above embodiment start.

[0437] Through the first method, the numerology of G symbols can be determined as the subcarrier spacing of the active UL BWP.

[0438] Through the second method, the numerology of G symbols can be determined as the subcarrier spacing of the active DL BWP.

[0439] Through the third method, the numerology of G symbols can be determined as the maximum or minimum of the subcarrier spacing of the active DL BWP and the subcarrier spacing of the active UL BWP.

[0440] Through the fourth method, the numerology of G symbols can be determined as the maximum or minimum of a list of subcarrier spacings that can be used in a cell where G symbols are to be applied.

[0441] Through the fifth method, the numerology of G symbols can be determined as a reference subcarrier spacing used in a semi-static UL / DL configuration of a cell in which G symbols are to be applied. The reference subcarrier spacing is a subcarrier spacing used to determine the duration of a downlink symbol or the duration of an uplink symbol according to the semi-static UL / DL configuration of the cell.

[0442] Through the sixth method, the numerology of G symbols can be determined as a fixed number. This fixed value varies in FR1 and FR2. In addition, this value can be the minimum or maximum among the subcarrier spacings that can be used in each FR. For example, when the fixed value is the minimum of the subcarrier spacings that can be used in each FR, the fixed value is a 15-kHz subcarrier spacing for FR1 and a 60-kHz subcarrier spacing for FR2. For example, when the fixed value is the maximum of the subcarrier spacings that can be used in each FR, the fixed value is a 60-kHz subcarrier spacing for FR1 and a 120-kHz subcarrier spacing for FR2.

[0443] Through the seventh method, the numerology of G symbols can be set from a base station. That is, the base station can transmit a subcarrier spacing to be used in G symbols to the user equipment, and the user equipment can use the value received from the base station as the subcarrier spacing of G symbols.

[0444] Figure 25 An example of a method for determining invalid symbols according to an embodiment of the present application is illustrated.

[0445] Reference Figure 25The user equipment can be instructed by the DCI of the PDCCH to retransmit the PUSCH, and the user equipment can determine the symbols that cannot be retransmitted for the PUSCH retransmission corresponding to the retransmission of the PUSCH, so that the retransmission of the PUSCH is performed by the allocated resources.

[0446] In detail, the user equipment can identify (or determine) the symbols in which PUSCH repetition cannot be transmitted. When an uncancellable uplink channel or signal exists, the user equipment can determine the resources for PUSCH repetition transmission based on its processing time capability. Furthermore, the user equipment can identify the symbols in which PUSCH repetition transmission cannot be performed, such as PRACH timings. Although the following description is based on uncancellable uplink signals or channels, the invention is not limited thereto and can be equally applied to other situations such as PRACH timings.

[0447] like Figure 25 As illustrated in the diagram, the PDCCH can instruct the user equipment to repeatedly transmit the PUSCH. That is, the base station can add the resource allocation information and the number of transmission repetitions information for the PUSCH retransmission to the DCI of the PDCCH for transmission, and the user equipment can receive the time-frequency resources for the first PUSCH retransmission and the number of repetitions via the PDCCH. Here, the resource allocation information may include the start symbol index and length of the first PUSCH retransmission.

[0448] The user equipment performs a first PUSCH repeat transmission on the time / frequency resources indicated by the PDCCH, and performs PUSCH repeat transmissions as many times as the transmission repeats. For example, as Figure 25 As illustrated, the PDCCH can schedule a first PUSCH retransmission with a length of 2 starting from the ninth symbol of the first time slot. That is, in order to indicate the retransmission of the PUSCH, the DCI of the PDCCH can include index information and length information regarding the starting symbol index of the first PUSCH retransmission being 9 and having a length of 2, and can further include transmission repetition number information regarding the transmission repetition number being 4, so as to indicate that the transmission repetition number is 4.

[0449] The user equipment may perform a first repeat transmission on the 9th and 10th symbols of the first time slot. In addition, the user equipment may perform a second repeat transmission on the 11th and 12th symbols of the first time slot, a third repeat transmission on the 13th and 14th symbols of the first time slot, and a fourth repeat transmission on the 1st and 2nd symbols of the second time slot.

[0450] Here, when the transmission of the uplink signal or channel is scheduled or configured on the 11th symbol of the first slot, the user equipment needs at least N2 symbols (or time T2) from the end of the PDCCH to the symbol where the uplink signal or channel is allocated in order to cancel (or drop) the configured transmission of the uplink signal or channel. That is, the transmission of the uplink signal or channel within N2 symbols (or time T2) from the end of the PDCCH cannot be canceled (or dropped) due to the processing time of the user equipment.

[0451] In this case, the user equipment can perform the PUSCH repetition transmission by the following method.

[0452] In the first embodiment, the user equipment can determine the symbols on which the PUSCH repetition transmission is to be performed regardless of whether the uplink signal or channel is canceled (or dropped).

[0453] Figure 26 FIG. 13 illustrates an example of a method for determining symbols of a PUSCH repetition transmission according to an embodiment of the present application.

[0454] Reference Figure 26 , the user equipment can determine the symbols on which the PUSCH repetition transmission is to be performed regardless of whether the uplink signal or channel is canceled or dropped. In addition, when a symbol of one PUSCH repetition transmission overlaps with an uplink signal or channel that cannot be canceled (or dropped), the PUSCH repetition transmission can not be performed on the overlapping symbol, and the uplink signal or channel that cannot be canceled (or dropped) can be transmitted.

[0455] Here, the redundancy value (RV) of each PUSCH repetition transmission can be determined regularly regardless of each PUSCH repetition transmission. For example, if the indicated RVs are a, b, c, d in order, the RVs of "a", "b", "c", and "d" can be allocated to the first, second, third, and fourth PUSCH repetition transmissions, respectively.

[0456] In Figure 26 , the symbol for the second PUSCH repetition transmission (Rep#1) overlaps with the symbol for transmitting the SRS as a non-cancelable signal. Accordingly, the user equipment can transmit the SRS on the corresponding symbol without transmitting the second PUSCH repetition transmission (Rep#1).

[0457] According to this method, the RVs can be simply allocated, and the PUSCH can be repeatedly transmitted. However, because the PUSCH is repeatedly transmitted a number of times less than the number of transmission repetitions indicated by the DCI of the base station through the PDCCH, the reliability can be deteriorated. Also, because the PUSCH repeated transmission corresponding to one of the indicated RVs is cancelled (or dropped) without being performed, the related reliability can also be deteriorated.

[0458] In the second embodiment, the user equipment can determine the symbols for the PUSCH repeated transmission to perform the PUSCH repeated transmission after confirming whether the uplink signal or channel is cancelled (or dropped).

[0459] Figure 27 Another example of a method for determining symbols of a PUSCH repeated transmission according to an embodiment of the present application is illustrated.

[0460] Reference Figure 27 , the user equipment can determine the symbols for the PUSCH repeated transmission to transmit the PUSCH according to the number of PUSCH transmission repetitions after confirming whether the uplink signal or channel is cancelled (or dropped). Also, the RVs to be applied to each of the PUSCH repeated transmissions can be sequentially determined as "a", "b", "c", and "d" according to the determined symbols of the PUSCH repeated transmission.

[0461] As Figure 27 illustrated in the first embodiment, because the SRS signal as the non-cancellable uplink signal or channel is positioned on the 11th symbol of the first slot, the repeated transmission of the PUSCH can be possible on the symbols except for the corresponding symbol. Thus, according to the symbol on which the non-cancellable SRS signal is positioned, the symbol for the second PUSCH repeated transmission can be delayed by one symbol compared to when there is no SRS signal.

[0462] Also, thereafter, the symbol allocation for the third PUSCH repeated transmission and the symbol allocation for the fourth PUSCH repeated transmission can follow. According to this method, compared to the first embodiment of Figure 26 , the PUSCH repeated transmission can be performed according to the number of PUSCH transmission repetitions indicated by the DCI of the base station through the PDCCH. Also, because the omission of the RVs does not occur, high reliability can be provided. However, in this case, the entire PUSCH repeated transmission can be delayed in time, thereby increasing the delay.

[0463] In the third embodiment, the user equipment can determine the symbols on which the PUSCH repeated transmission is to be performed regardless of whether the uplink signal or channel (or channel) is cancelled.

[0464] Figure 28FIG. 13 illustrates another example of a method for determining symbols of a PUSCH repetition transmission according to an embodiment of the present application.

[0465] Referring to Figure 28 When the symbols for one PUSCH repetition transmission overlap with the symbols of an uplink signal or channel that cannot be cancelled (or dropped), the PUSCH repetition transmission can not be performed on the overlapping symbols, and the uplink signal or channel that cannot be cancelled (or dropped) can be transmitted. In addition, when there is a cancelled PUSCH repetition transmission, the next PUSCH repetition transmission can be performed on the symbol among the remaining symbols on which transmission can be performed the fastest.

[0466] As Figure 28 As illustrated in FIG. 13, when the second PUSCH repetition transmission (Rep#1) overlaps with the symbols of the non-cancellable SRS signal, the PUSCH repetition transmission is cancelled (or dropped). Thereafter, the symbols on which the PUSCH repetition transmission (Rep#2, Rep#3) is to be transmitted can be newly determined as the symbols among the remaining symbols on which transmission can be performed the fastest. That is, the third PUSCH repetition transmission (Rep#2) is generally allocated to the 13th and 14th symbols of the first slot, but can be transmitted on the 12th and 13th symbols that are the symbols transmitted the fastest after the second PUSCH repetition transmission (Rep#1) is cancelled. That is, the third PUSCH repetition transmission can be transmitted one symbol earlier.

[0467] Compared to the first method, this method provides the same reliability and provides low latency because transmission is performed at the earliest possible symbol.

[0468] In another embodiment of the present application, the base station can change the uplink beam used to transmit each PUSCH repetition transmission to the user equipment. This is because when the base station transmits a signal to the user equipment using beamforming in a high frequency band, reliability can be improved by using different uplink beams.

[0469] This can be referred to as beam diversity. In an embodiment of the present application, at least one symbol gap can be inserted between PUSCH repetition transmissions transmitted using different beams, thereby guaranteeing the time for the user equipment to change the beam. Here, the number of symbols of the gap can vary according to the uplink subcarrier spacing. That is, as the uplink subcarrier spacing increases, the number of symbols that can be used for the gap can increase.

[0470] Another problem addressed by this invention relates to a method for calculating the size of a transport block (TB) when sending PUSCH repeats. According to TS38.214, the size of the TB can be proportional to the number of REs (Resources) allocating the PUSCH. That is, a PUSCH with a larger number of allocated REs may have a larger TB size. However, as described above regarding embodiments related to PUSCH repeats, the number of REs that each PUSCH can occupy can vary. For example, a first PUSCH repeat may occupy two symbols, and a second PUSCH repeat may occupy 10 symbols. In this case, it is necessary to determine which number of REs the TB size should be based on.

[0471] A preferred embodiment of the present invention relates to a method for determining the size of a TB such that a first PUSCH is decodable. The reason for using PUSCH repetition is to reduce latency by enabling fast decoding success. Therefore, it is important to transmit the first PUSCH decodably. For this purpose, the user equipment can determine the size of the TB based on the number of REs (Repeated Entries) of the first PUSCH. In general, the user equipment can determine the size of the TB based on the minimum number of REs corresponding to a PUSCH repetition with an RV value of 0. However, when the size of the TB is always determined based on the number of REs for the first PUSCH, the optimal TB size may not be determined because the number of REs occupied by another PUSCH is not considered.

[0472] For example, when the number of REs occupied by the first PUSCH is greater than the number of REs occupied by the second PUSCH, if the size of the TB is determined based on the number of REs occupied by the first PUSCH, the bitrate increases due to the smaller number of REs occupied by the second PUSCH, resulting in performance degradation.

[0473] According to a preferred embodiment of the solution to the problem, if the number of REs repeated in the first PUSCH is less than the average number of REs repeated in all PUSCHs (i.e., the value obtained by dividing the number of REs repeated in all PUSCHs by the number of repetitions), the size of the TB can be determined based on the number of REs in the first PUSCH; otherwise, the size of the TB for the PUSCH can be determined based on the average number of REs repeated in all PUSCHs.

[0474] According to a preferred embodiment for solving this problem, if the TB size based on the number of REs repeated according to the first PUSCH is less than the average of the TB sizes based on the number of REs repeated across all PUSCHs (i.e., the sum of the TB sizes based on the number of REs repeated across each PUSCH divided by the number of repetitions), then the size of TB is determined based on the number of REs in the first PUSCH; otherwise, the size of TB is determined based on the average of the TB sizes based on the number of REs repeated across all PUSCHs.

[0475] The method can be used to determine the size of a TB for repeated transmission of a PUSCH.

[0476] Figure 29 is a flowchart illustrating an example of a method for a user equipment to perform repeated transmission of a PUSCH according to an embodiment of the present application.

[0477] Referring to Figure 29 , the user equipment can determine resources for a specific type of repeated transmission of a PUSCH to perform repeated transmission of a PUSCH. Here, the repeated transmission of a PUSCH can be performed by resources configured with symbols other than invalid symbols.

[0478] Specifically, first, the user equipment can receive configuration information for a PUSCH transmission from a base station (S29010). Here, the configuration information can include resource information related to a control resource set for an initial access procedure and / or bitmap information indicating a symbol pattern of invalid symbols.

[0479] In addition, the configuration information can further include information indicating a semi-static downlink symbol and information indicating a symbol for receiving an SS / PBCH block.

[0480] Thereafter, the user equipment can receive a PDCCH including DCI for scheduling repeated transmission of a PUSCH from a base station (S29020). The DCI can include at least one of a starting symbol index, a length, and a repetition number of a first PUSCH repetition.

[0481] In addition, the DCI can further include an indicator related to whether to apply bitmap information indicating invalid symbols transmitted through the configuration information.

[0482] Thereafter, the user equipment can determine one or more invalid symbols for repeated transmission of a PUSCH (S29030). The one or more invalid symbols can include the above-described symbols corresponding to 1) to 5).

[0483] That is, the one or more invalid symbols can include the following symbols.

[0484] 1) a semi-static DL symbol and a symbol for receiving an SS / PBCH block

[0485] 2) a symbol overlapping with a CORESET #0

[0486] 3) a downlink symbol of another cell

[0487] 4) a symbol configured as an invalid symbol by RRC

[0488] 5) at least G symbols after the last symbol of the symbols corresponding to 1) to 4)

[0489] For example, the one or more invalid symbols can include a symbol indicated by resource information related to a resource set for an initial access procedure.

[0490] Thereafter, the user equipment can repeatedly transmit the PUSCH on at least one symbol of each slot scheduled by the PDCCH except for the invalid symbol (S29040).

[0491] Here, the invalid symbol can be classified as the first type or the second type as described above, and the symbol belonging to the first type can be necessarily excluded from the symbol allocated for the repeated transmission of the PUSCH, and the symbol belonging to the second type can be excluded or can not be excluded according to the situation.

[0492] In addition, the subcarrier spacing of the gap symbol can be a reference subcarrier spacing included in the semi-static uplink and / or downlink configuration information of the cell to which the gap symbol applies for the repeated transmission of the PUSCH.

[0493] Figure 30 is a flowchart illustrating an example of a method of a base station repeatedly receiving a PUSCH according to an embodiment of the present application.

[0494] Referring to Figure 30 , the base station can repeatedly receive the PUSCH from the user equipment through the resource determined for the repeated transmission of a specific type of PUSCH. Here, the repeated transmission of the PUSCH can be performed through the resource configured with the symbol except for the invalid symbol.

[0495] Specifically, first, the base station can transmit configuration information for PUSCH transmission to the user equipment (S30010). Here, the configuration information can include resource information related to a control resource set for an initial access procedure and / or bitmap information indicating a symbol pattern of an invalid symbol.

[0496] In addition, the configuration information can further include information for indicating a semi-static downlink symbol and information indicating a symbol for receiving an SS / PBCH block.

[0497] Thereafter, the base station can transmit a PDCCH including DCI for scheduling the repeated transmission of the PUSCH to the user equipment (S30020). The DCI can include at least one of a starting symbol index, a length, and a repetition number of the first PUSCH repetition.

[0498] In addition, the DCI can further include an indicator related to whether to apply the bitmap information indicating the invalid symbol transmitted through the configuration information.

[0499] Thereafter, the base station can repeatedly receive the PUSCH on at least one symbol of each slot scheduled by the PDCCH except for the invalid symbol (S30040).

[0500] The one or more invalid symbols can include the above-described symbols corresponding to 1) to 5).

[0501] That is, the one or more invalid symbols can include the following symbols.

[0502] 1) A semi-static DL symbol and a symbol for receiving an SS / PBCH block

[0503] 2) A symbol overlapping with CORESET #0

[0504] 3) A downlink symbol of another cell

[0505] 4) A symbol configured as an invalid symbol by RRC

[0506] 5) At least G symbols after a last symbol of the symbols corresponding to 1) to 4)

[0507] For example, the one or more invalid symbols can include a symbol indicated by resource information related to a resource set for an initial access procedure.

[0508] Here, the invalid symbol can be classified as the first type or the second type as described above, and the symbol belonging to the first type can be necessarily excluded from the symbol allocated for the repeated transmission of the PUSCH, and the symbol belonging to the second type can be excluded or can not be excluded according to the situation.

[0509] In addition, the subcarrier spacing of the gap symbol can be a reference subcarrier spacing included in the semi-static uplink and / or downlink configuration information of the cell to which the gap symbol applies for the repeated transmission of the PUSCH.

[0510] Through this method, the base station can repeatedly receive the PUSCH from the user equipment only on the valid symbol.

[0511] The above description of the present application is only exemplary, and it is easily understood by those of ordinary skill in the art that modifications can be easily made without departing from the technical concept of the present application or changing the essential features. Therefore, the above-described embodiments should be considered illustrative rather than limiting. For example, each component described as a single type can be distributed, and likewise, components described as distributed can be implemented in a combined form.

[0512] The scope of the present application is indicated by the appended claims rather than the detailed description, and it is understood that all changes or modifications derived from the meaning and scope of the claims and equivalents thereof are included in the scope of the present application.

Claims

1. A method for transmitting a Physical Uplink Shared Channel (PUSCH) performed by a user equipment in a wireless communication system, the method comprising: Receive the physical downlink control channel (PDCCH) for scheduling repeated transmissions of the PUSCH; Determine invalid symbol groups for repeated transmissions of the PUSCH; as well as Repeated transmission of the PUSCH is performed on at least one symbol scheduled by the PDCCH, excluding the invalid symbol group. Wherein, when multiple PUSCH repetitions in the repeated transmission of the PUSCH overlap with the Physical Uplink Control Channel (PUCCH), the User Equipment (UE) transmits the Uplink Control Information (UCI) associated with the PUCCH through the earliest PUSCH repetition that meets certain conditions among the overlapping multiple PUSCH repetitions. These conditions include: - Processing time for multiplexing with the UCI, and - The earliest PUSCH repeat with multiple symbols.

2. The method according to claim 1, in, The invalid symbol group includes one or more symbols of the overlapping CORESET when one or more symbols of the PUSCH retransmission and control resource set CORESET overlap, and when the overlapping CORESET is indicated by the physical broadcast channel PBCH among a plurality of CORESETs associated with the user equipment.

3. The method according to claim 2, in, When the overlapping CORESET is not CORESET#0, the invalid symbol group does not include one or more symbols of the overlapping CORESET.

4. The method according to claim 1, in, The invalid symbol group further includes: symbols indicated as semi-static downlink symbols, and / or symbols used to receive synchronization signal / physical broadcast channel (SS / PBCH) blocks.

5. The method according to claim 1, in, When the user equipment supports half-duplex capability, the invalid symbol group further includes: symbols allocated for downlink channels and signals, and / or symbols indicated as semi-static downlink symbols in a cell different from the cell in which the repeated transmission of the PUSCH is performed.

6. The method according to claim 1, in, The invalid symbol group further includes gap symbols, and The gap symbol is at least one symbol positioned after the symbol indicated for downlink reception.

7. The method according to claim 6, in, The subcarrier spacing of the gap symbol is a reference subcarrier spacing included in the semi-static uplink and downlink configuration information of the cell in which the gap symbol is applied to the repeated transmission of the PUSCH.

8. The method according to claim 6, in, The symbol indicated for downlink reception is a semi-static downlink symbol, a symbol for receiving SS / PBCH blocks, or a symbol included in the control resource set.

9. A user equipment configured to operate in a wireless communication system, the user equipment comprising: Communication module; and The processor is used to control the communication module. The processor is configured as follows: Receive the physical downlink control channel (PDCCH) used to schedule repeated transmissions of the physical uplink shared channel (PUSCH); Determine invalid symbol groups for repeated transmissions of the PUSCH; and Repeated transmission of the PUSCH is performed on at least one symbol scheduled by the PDCCH, excluding the invalid symbol group. Wherein, when multiple PUSCH repetitions in the repeated transmission of the PUSCH overlap with the Physical Uplink Control Channel (PUCCH), the processor is configured to transmit the uplink control information (UCI) associated with the PUCCH by the earliest PUSCH repetition among the overlapping multiple PUSCH repetitions that meets certain conditions, the conditions including: - Processing time for multiplexing with the UCI, and - The earliest PUSCH repeat with multiple symbols.

10. The user equipment according to claim 9, in, The invalid symbol group includes one or more symbols of the overlapping CORESET when one or more symbols of the PUSCH retransmission and control resource set CORESET overlap, and when the overlapping CORESET is indicated by the physical broadcast channel PBCH among a plurality of CORESETs associated with the user equipment.

11. The user equipment according to claim 10, in, When the overlapping CORESET is not CORESET#0, the invalid symbol group does not include one or more symbols of the overlapping CORESET.

12. The user equipment according to claim 9, in, The invalid symbol group further includes: symbols indicated as semi-static downlink symbols, and / or symbols used to receive synchronization signal / physical broadcast channel (SS / PBCH) blocks.

13. The user equipment according to claim 9, in, When the user equipment supports half-duplex capability, the invalid symbol group further includes: symbols allocated for downlink channels and signals, and / or symbols indicated as semi-static downlink symbols in a cell different from the cell in which the repeated transmission of the PUSCH is performed.

14. The user equipment according to claim 9, in, The invalid symbol group further includes gap symbols, and The gap symbol is at least one symbol positioned after the symbol indicated for downlink reception.

15. The user equipment according to claim 14, in, The subcarrier spacing of the gap symbol is a reference subcarrier spacing included in the semi-static uplink and downlink configuration information of the cell in which the gap symbol is applied to the repeated transmission of the PUSCH.

16. The user equipment according to claim 14, in, The symbol indicated for downlink reception is a semi-static downlink symbol, a symbol for receiving SS / PBCH blocks, or a symbol included in the control resource set.

Images