Data sending method and receiving method of wireless communication system and device thereof

Abstract

Disclosed are a data transmission method and a data reception method of a wireless communication system and a device thereof. A terminal of the wireless communication system includes a communication module and a processor, and the processor is configured to control the communication module. The processor receives a radio resource control (RRC) signal from a base station of the wireless communication system through the communication module, and determines a time-frequency resource corresponding to at least one resource set indicated by the RRC signal. The processor receives a physical control channel from a base station through the communication module, determines a time-frequency resource domain in which a physical data channel of a terminal is scheduled to be received through the physical control channel, and receives a physical data channel based on the time-frequency resource in which the physical data channel of the terminal receives the scheduled time-frequency resource and the time-frequency resource in which at least one resource set overlaps. The resource set is a collection of time-frequency resources.

Description

[0001] This application is a divisional application of a patent application with application number 201880064924.4 (PCT / KR2018 / 010576), which was submitted to the China Patent Office on April 3, 2020, with an international application date of September 10, 2018, and the invention name is "Data sending method and receiving method for wireless communication system and device using the method". Technical Field

[0002] The present invention relates to a wireless communication system, and in particular to a data sending method, a data receiving method and a device using the method in a wireless communication system. Background Art

[0003] After the commercialization of the fourth generation (4G) communication system, efforts are being made to develop a new fifth generation (5G) communication system in order to meet the growing demand for wireless data services. The 5G communication system is referred to as a beyond-4G network communication system, a post-LTE system, or a new radio (NR) system. In order to achieve high data transmission rates, the 5G communication system includes a system operating using a millimeter wave (mmWave) frequency band of 6 GHz or higher, and includes a communication system operating using a frequency band of 6 GHz or lower in terms of ensuring coverage, so that implementation in base stations and terminals is being considered.

[0004] The 3rd Generation Partnership Project (3GPP) NR system enhances the spectrum efficiency of the network and enables communications providers to provide more data and voice services over a given bandwidth. Therefore, in addition to supporting a large amount of voice, the 3GPP NR system is also designed to meet the needs of high-speed data and media transmission. The advantages of the NR system are higher throughput and lower latency on the same platform, support for frequency division duplex (FDD) and time division duplex (TDD), and lower operating costs with an enhanced end-user environment and simple architecture.

[0005] For more efficient data processing, the dynamic TDD of the NR system can use a method for changing the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used in the uplink and downlink according to the data service direction of the cell user. For example, when the downlink service of the cell is greater than the uplink service, the base station can allocate multiple downlink OFDM symbols to the time slot (or subframe). Information about the time slot configuration should be sent to the terminal.

[0006] In order to mitigate the path loss of radio waves and increase the transmission distance of radio waves in the millimeter wave band, in the 5G communication system, beamforming, massive multiple input / output (massive MIMO), full-size MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming combining analog beamforming and digital beamforming, and massive antenna technology are discussed. In addition, in order to improve the network systematically, in the 5G communication system, technology development related to evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), mobile network, cooperative communication, multi-point coordination (CoMP), interference cancellation, etc. is underway. In addition, in the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM) schemes and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced connection technologies are under development.

[0007] Meanwhile, in a human-centered connected network where people generate and consume information, the Internet has evolved into an Internet of Things (IoT) network that exchanges information between distributed components such as objects. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology through connection with a cloud server, is also on the rise. In order to implement IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, so in recent years, technologies such as sensor networks, machine-to-machine (M2M), and machine type communication (MTC) have been studied for connections between objects. In the IoT environment, an intelligent Internet technology (IT) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. Through the integration and hybridization of existing information technology (IT) and various industries, the IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services.

[0008] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M), and machine-type communications (MTC) are implemented through technologies such as beamforming, MIMO, and array antennas. Cloud RAN as an application of the above-mentioned big data processing technology is an example of the fusion of 5G technology and IoT technology. In general, mobile communication systems have been developed to provide voice services while ensuring user activities.

[0009] However, mobile communication systems are gradually expanding not only voice but also data services, and have now developed to the extent of providing high-speed data services. However, in the mobile communication systems currently providing services, due to resource shortages and users' high-speed service requirements, more advanced mobile communication systems are needed. Summary of the invention

[0010] Technical issues

[0011] An object of the embodiments of the present invention is to provide a method and device for effectively transmitting a signal in a wireless communication system. Another object of the embodiments of the present invention is to provide a data transmitting method, a receiving method and a device using the method in a wireless communication system.

[0012] Technical Solution

[0013] A terminal of a wireless communication system according to an embodiment of the present invention includes: a communication module; and a processor configured to control the communication module. The processor is configured to receive a radio resource control (RRC) signal from a base station of the wireless communication system through the communication module, determine a time-frequency resource corresponding to at least one resource set indicated by the RRC signal, receive a physical control channel from the base station through the communication module, determine a time-frequency resource domain in which the physical control channel schedules the physical data channel of the terminal to receive, and receive the physical data channel based on the time-frequency resource in which the physical data channel of the terminal receives the scheduled time-frequency resource and the time-frequency resource in which at least one resource set overlaps. A resource set is a collection of time-frequency resources.

[0014] The overlapping time-frequency resources may be divided into a plurality of sub-resource sets. The processor may be configured to: obtain a rate matching indicator indicating whether physical data channel reception is unavailable for each of the plurality of sub-resource sets from a physical control channel, and receive a physical data channel by determining, for each of the sub-resource sets, in a time-frequency resource corresponding to the sub-resource set whether physical data channel reception is unavailable based on the rate matching indicator.

[0015] The sub-resource sets may be divided based on the frequency domain among the overlapping time-frequency resources without making distinction in the time domain.

[0016] At least one resource set may be respectively identified by indexes different from each other. The rate matching indicator may consist of a plurality of bits, and a sub-resource set indicated by each of the plurality of bits may be determined based on the index.

[0017] When the time-frequency resources in which the physical data channel of the terminal receives scheduled and at least one resource set are all non-overlapping, the processor can be configured to: receive the physical data channel in the time-frequency resource domain in which the physical data channel of the terminal receives scheduled, regardless of the rate matching indicator.

[0018] A physical control channel may be received in a first time slot. When, in a second time slot in which a physical data channel is received, a time-frequency resource in which the physical data channel is scheduled overlaps with at least one resource set, the processor may be configured to perform rate matching to receive the physical data channel in time-frequency resources other than time-frequency resources in which the time-frequency resource in which the physical data channel is scheduled overlaps with at least one resource set among the time-frequency resources in which the physical data channel is scheduled in the second time slot. In this case, the first time slot and the second time slot may be different from each other.

[0019] A terminal of a wireless communication system according to an embodiment of the present invention comprises: a communication module; and a processor configured to control the communication module. The processor is configured to: receive a physical control channel, and when the physical control channel schedules the reception of a physical data channel of the terminal in multiple time slots, receive the physical data channel based on a constant orthogonal frequency division multiplexing (OFDM) symbol position in all time slots in which the physical data channel is transmitted.

[0020] The physical control channel may be transmitted in the first time slot. The processor may be configured to: receive a radio resource control (RRC) signal from a base station of the wireless communication system through the communication module, and determine a time-frequency resource corresponding to at least one resource set indicated by the RRC signal, and when the time-frequency resource in which the physical data channel is scheduled overlaps with at least one resource set in a second time slot included in a plurality of time slots, perform rate matching to receive the physical data channel in a time-frequency resource other than a time-frequency resource in which the time-frequency resource in which the physical data channel is scheduled in the second time slot overlaps with at least one resource set in the time-frequency resource in which the physical data channel is scheduled in the second time slot. The first time slot and the second time slot may be different from each other.

[0021] The position of the time-frequency resources corresponding to the resource set in which the physical data channel reception is unavailable in each of the multiple time slots may be constant. Rate matching may be performed to receive the physical data channel in the time-frequency resources corresponding to the physical data channel scheduled in each of the multiple time slots except the time-frequency resources corresponding to the position.

[0022] The OFDM symbol positions may be indicated by a physical control channel.

[0023] The operation method of the terminal of the wireless communication system according to the embodiment of the present invention includes: receiving a radio resource control (RRC) signal from a base station of the wireless communication system through a communication module; determining a time-frequency resource corresponding to at least one resource set indicated by the RRC signal; receiving a physical control channel from the base station through the communication module; determining a time-frequency resource domain in which the physical control channel schedules the reception of the physical data channel of the terminal; and receiving the physical data channel based on the time-frequency resource in which the physical data channel reception of the terminal is scheduled and overlaps with at least one resource set. A resource set is a collection of time-frequency resources.

[0024] The overlapping time-frequency resources may be divided into a plurality of sub-resource sets. Determining a time-frequency resource domain in which the physical data channel reception of the terminal is scheduled by the physical control channel may include: obtaining from the physical control channel a rate matching indicator indicating whether the physical data channel reception is unavailable for each of the plurality of sub-resource sets. Receiving the physical data channel may include: receiving the physical data channel by determining, for each of the sub-resource sets, in a time-frequency resource corresponding to the sub-resource set, according to the rate matching indicator, whether the physical data channel reception is unavailable.

[0025] The sub-resource sets may be divided based on the frequency domain among the overlapping time-frequency resources without making distinction in the time domain.

[0026] At least one resource set may be respectively identified by indexes different from each other. The rate matching indicator may consist of a plurality of bits, and a sub-resource set indicated by each of the plurality of bits may be determined based on the index.

[0027] Receiving the physical data channel may include: when the time-frequency resources in which the physical data channel of the terminal receives scheduled time-frequency resources do not overlap with at least one resource set, receiving the physical data channel in the time-frequency resource domain in which the physical data channel of the terminal receives scheduled time-frequency resources, regardless of the rate matching indicator.

[0028] The physical control channel may be received in the first time slot. Receiving the physical data channel may include: when in the second time slot in which the physical data channel is received, the time-frequency resources in which the physical data channel is scheduled overlap with at least one resource set, performing rate matching to receive the physical data channel in time-frequency resources other than time-frequency resources in which the time-frequency resources in which the physical data channel is scheduled overlap with at least one resource set among the time-frequency resources in which the physical data channel is scheduled in the second time slot. The first time slot and the second time slot may be different from each other.

[0029] An operating method of a terminal of a wireless communication system according to an embodiment of the present invention includes: receiving a physical control channel; and when the physical data channel reception of the terminal is scheduled by the physical control channel in multiple time slots, receiving the physical data channel based on a constant orthogonal frequency division multiplexing (OFDM) symbol position in all time slots in which the physical data channel is transmitted.

[0030] The physical control channel may be transmitted in the first time slot. The operation method may further include receiving a radio resource control (RRC) signal from a base station of the wireless communication system through the communication module, and determining time-frequency resources corresponding to at least one resource set indicated by the RRC signal.

[0031] Receiving the physical data channel may include: when the time-frequency resource in which the physical data channel is scheduled overlaps with the at least one resource set in a second time slot included in the plurality of time slots, performing rate matching to receive the physical data channel in time-frequency resources other than time-frequency resources in which the time-frequency resource in which the physical data channel is scheduled overlaps with the at least one resource set in the second time slot. The first time slot and the second time slot may be different from each other.

[0032] The position of the time-frequency resources corresponding to the resource set unavailable for reception of the physical data channel in each of the plurality of time slots may be constant. Receiving the physical data channel may include: performing rate matching to receive the physical data channel in time-frequency resources other than the time-frequency resources corresponding to the position among the time-frequency resources corresponding to the physical data channel scheduled in each of the plurality of time slots.

[0033] The OFDM symbol positions may be indicated by a physical control channel.

[0034] Beneficial Effects

[0035] Embodiments of the present invention provide a method for efficiently transmitting data, a method for receiving data, and a device using the method in a wireless communication system.

[0036] Effects obtainable from various embodiments of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned above can be clearly derived and understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 An example of a radio frame structure used in a wireless communication system is illustrated;

[0038] Figure 2 An example of a downlink (DL) / uplink (UL) time slot structure in a wireless communication system is illustrated;

[0039] Figure 3is a schematic diagram for explaining physical channels used in a 3GPP system and a typical signal transmission method using the physical channels;

[0040] Figure 4 FIG. 1 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system;

[0041] Figure 5 FIGURE 1 illustrates a process for transmitting control information and control channels in a 3GPP NR system;

[0042] Figure 6 FIGURE 1 illustrates a control resource set (CORESET) in which a physical downlink control channel (PUCCH) may be transmitted in a 3GPP NR system;

[0043] Figure 7 A method for configuring a PDCCH search space in a 3GPP NR system is illustrated;

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

[0045] Fig. 9 It is a schematic diagram for explaining signal carrier communication and multi-carrier communication;

[0046] Fig.10 is a schematic diagram showing an example of applying a cross-carrier scheduling technology;

[0047] Fig.11 is a block diagram showing the configuration of a UE and a base station according to an embodiment of the present disclosure;

[0048] Fig.12 A resource set used in a wireless communication system according to an embodiment of the present invention is illustrated.

[0049] Fig.13 FIG. 1 illustrates a time-frequency resource region in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention.

[0050] Fig.14 FIG. 1 illustrates a time-frequency resource region in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention.

[0051] Figure 15 to Figure 16 It is illustrated that a terminal of a wireless communication system according to an embodiment of the present invention receives a PDSCH in a RESET configured for the terminal.

[0052] Fig.17 It is illustrated that a terminal receives a PDSCH when cross-slot scheduling is performed in a wireless communication system according to an embodiment of the present invention.

[0053] Fig.18 and Fig.19 It is illustrated that a terminal receives a PDSCH when slot aggregation-based scheduling is performed in a wireless communication system according to an embodiment of the present invention.

[0054] Fig. 20 An example of a sub-resource set used in a wireless communication system according to an embodiment of the present invention is illustrated.

[0055] Fig.21 FIG. 1 illustrates that a terminal receives a PDSCH based on overlapping RESETs in a wireless communication system according to an embodiment of the present invention.

[0056] Figure 22 to Figure 24 The diagram shows a situation where time-frequency resources indicated as being occupied by different RESETs overlap.

[0057] Fig.25 A time slot configuration used in a wireless communication system according to an embodiment of the present invention is illustrated.

[0058] Fig.26 The diagram shows that a UE-specific PDCCH in a wireless communication system indicates scheduled resources to a terminal according to an embodiment of the present invention.

[0059] Fig. 27 The diagram illustrates that, in a wireless communication system according to an embodiment of the present invention, a base station sends two RIVs to a terminal to indicate a scheduled time-frequency domain to the terminal.

[0060] Fig.28 The diagram illustrates that, in a wireless communication system according to an embodiment of the present invention, a base station sends two RIVs to a terminal to indicate a scheduled time-frequency domain to the terminal.

[0061] Figure 29 to Figure 33 An OFDM symbol corresponding to a physical data channel scheduled for a terminal indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention is illustrated. DETAILED DESCRIPTION

[0062] The terms used in the specification adopt general terms, which are currently used as widely as possible by considering the functions in the present invention, but these terms may be changed according to the intentions, habits and emergence of new technologies of the technicians in the field. In addition, in specific cases, there are terms arbitrarily selected by the applicant, and in this case, their meanings will be described in the corresponding description part of the present invention. Therefore, it is intended to reveal that the terms used in the specification should be analyzed not only based on the names of the terms, but also based on the substantial meanings of the terms and contents in the specification.

[0063] Throughout the specification and the claims that follow, when an element is described as being “connected” to another element, the element may 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 “comprising” will be understood to imply the inclusion of the stated elements, but not the exclusion of any other elements, unless otherwise specified. Furthermore, in some exemplary embodiments, limitations such as “greater than or equal to” or “less than or equal to” based on specific thresholds may be appropriately replaced with “greater than” or “less than”, respectively.

[0064] The following technologies can be used for 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. CDMA can be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA can be implemented by radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate (EDGE) GSM Evolution. OFDMA can be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of the Evolved UMTS (E-UMTS) using the Evolved UMTS Terrestrial Radio Access (E-UTRA) and LTE Advanced (A) is an evolved version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A, and is a system for supporting enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC) and massive machine type communication (mMTC) services, which are requirements of IMT-2020. For the sake of clear description, 3GPP NR is mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0065] Unless otherwise specified herein, the base station may include a next generation node B (gNB) defined in 3GPP NR. In addition, unless otherwise specified, the terminal may include a user equipment (UE). In the following, to help understand the description, the embodiments describe each content separately, but each embodiment may be used in combination with each other. In this specification, the configuration of the UE may indicate the configuration of the base station. In more detail, the base station may configure the value of a parameter used in the operation of the UE or the wireless communication system by sending a channel or a signal to the UE.

[0066] Figure 1An example of a radio frame structure used in a wireless communication system is illustrated.

[0067] refer to Figure 1 , a radio frame (or radio frame) used in a 3GPP NR system may have a length of 10 ms (Δf max N f / 100)*T c ). In addition, a radio frame includes 10 subframes (SFs) of equal size. Here, Δf max =480*10 3 Hz,N f =4096,T c =1 / (Δf ref *N f,ref ), Δf ref =15*10 3 Hz, and N f,ref =2048. Numbers from 0 to 9 can be respectively assigned to 10 subframes within a radio frame. Each subframe has a length of 1 ms and can include one or more time 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 subcarrier spacing configurations. That is, 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz can be used for subcarrier spacing. A subframe with a length of 1ms can include 2 μ In this case, the length of each time slot is 2 -μ ms. From 0 to 2 μ-1 The numbers can be assigned to the 2 μ In addition, 0 to 10*2 μ Numbers of -1 may be respectively allocated to time slots within a subframe. Time resources may 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 time slot number (or a time slot index).

[0068] Figure 2 An example of a downlink (DL) / uplink (UL) time slot structure in a wireless communication system is illustrated. In particular, Figure 2 The structure of the resource grid of the 3GPP NR system is shown.

[0069] There is one resource grid per antenna port. Figure 2, a time slot includes multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. OFDM symbol also means a symbol section. Unless otherwise specified, OFDM symbol may be simply referred to as symbol. One RB includes 12 consecutive subcarriers in the frequency domain. Figure 2 , the signal transmitted from each time slot can be composed of N size,μ grid,x *N RB sc subcarriers and N slot symb Here, when the signal is a DL signal, x=DL, and when the signal is a UL signal, x=UL. N size,μ grid,x represents the number of resource blocks (RBs) that make up μ (x is DL or UL) according to the subcarrier spacing, and N slot symb N represents the number of OFDM symbols in a time slot. RB sc is the number of subcarriers that make up one RB and N RB sc = 12. Depending on the multiple access scheme, an OFDM symbol may be called a cyclic shifted OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol.

[0070] The number of OFDM symbols included in one slot may vary depending on the length of the cyclic prefix (CP). For example, in the case of a normal CP, one slot includes 14 OFDM symbols, but in the case of an extended CP, one slot may include 12 OFDM symbols. In a specific embodiment, the extended CP may be used only with a 60kHz subcarrier spacing. Figure 2 In the embodiment, for the convenience of description, as an example, one time slot is configured with 14 OFDM symbols, but the embodiments of the present invention can be applied in a similar manner to time slots with different numbers of OFDM symbols. Figure 2 , each OFDM symbol includes N size ,μ grid,x *N RB sc subcarriers. The types of subcarriers can be divided into data subcarriers for data transmission, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0071] An RB can be composed of N RB scFor reference, a resource configured with one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB can be configured with N slot symb *N RB sc rc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) in a time slot. k can be a random number from 0 to N in the frequency domain. size,μ grid,x *N RB sc –1 assigned index, and l can be from 0 to N in the time domain slot symb –1 Assigned index.

[0072] In order for a UE to receive or send signals from or to a base station, the UE's time / frequency may be synchronized with that of the base station. This is because when the base station and the UE are synchronized, the UE can determine the time and frequency parameters required to demodulate DL signals and send UL signals at the correct time.

[0073] Each symbol of a radio frame used in a time division duplex (TDD) or unpaired spectrum may be configured with at least one of a DL symbol, a UL symbol, and a flexible symbol. A radio frame that may be used as a DL carrier in a frequency division duplex (FDD) or paired spectrum may be configured with a DL symbol or a flexible symbol, while a radio frame used as a UL carrier may be configured with a UL symbol or a flexible symbol. In a DL symbol, DL transmission is possible, but UL transmission is not possible. In a UL symbol, UL transmission is possible, but DL transmission is not possible. A flexible symbol may be determined to be used as DL or UL according to a signal.

[0074] Information about the type of each symbol, that is, information indicating any one of a DL symbol, a UL symbol, and a flexible symbol, may be configured with a cell-specific or common radio resource control (RRC) signal. In addition, information about the type of each symbol may be additionally configured with a UE-specific or dedicated RRC signal. The base station notifies, by using a cell-specific RRC signal, i) the period of the cell-specific time slot configuration, ii) the number of time slots having only DL symbols from the beginning of the period of the cell-specific time slot configuration, iii) the number of DL symbols starting from the first symbol of the time slot immediately following the time slot having only DL symbols; iv) the number of time slots having only UL symbols starting from the end of the period of the cell-specific time slot configuration; and v) the number of UL symbols starting from the last symbol of the time slot immediately before the time slot having only UL symbols. Here, a symbol that is not configured with any of the UL symbol and the DL symbol is a flexible symbol.

[0075] When information about the symbol type is configured with a UE-specific RRC signal, the base station may signal whether the flexible symbol is a DL symbol or a UL symbol in the cell-specific RRC signal. In this case, the UE-specific RRC signal cannot change the DL symbol or UL symbol configured with the cell-specific RRC signal to another symbol type. The UE-specific RRC signal may signal the N of the corresponding time slot for each time slot. slot symb The number of DL symbols among the symbols, and the N of the corresponding time slot slot symb The number of UL symbols among the symbols. In this case, the DL symbols of the time slot can be continuously configured with the first symbol to the i-th symbol of the time slot. In addition, the UL symbols of the time slot can be continuously configured with the j-th symbol to the last symbol of the time slot (where i < j). In the time slot, the symbol that is not configured with any of the UL symbol and the DL symbol is a flexible symbol.

[0076] The type of symbol configured with the above RRC signal may be referred to as a semi-static DL / UL configuration. In a semi-static DL / UL configuration previously configured with an RRC signal, a flexible symbol may be indicated by a DL symbol, a UL symbol, or a flexible symbol through dynamic slot format information (SFI) sent on a physical DL control channel (PDCCH). In this case, a DL symbol or UL symbol configured with an RRC signal will not be changed to another symbol type. Table 1 illustrates the dynamic SFI that the base station may indicate to the UE.

[0077] [Form 1]

[0078]

[0079] In Table 1, D represents a DL symbol, U represents a UL symbol, and X represents a flexible symbol. As shown in Table 1, a maximum of two DL / UL switchings may be allowed in one slot.

[0080] Figure 3 is a diagram for explaining physical channels used in a 3GPP system (e.g., NR) and a typical signal transmission method using the physical channels.

[0081] If the power of the UE is turned on or the UE resides in a new cell, the UE performs an initial cell search (S101). Specifically, the UE may be synchronized with the BS in the initial cell search. To this end, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as a cell ID. Thereafter, the UE may receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0082] After completing the initial cell search, the UE receives a physical downlink shared channel (PDSCH) according to the physical downlink control channel (PDCCH) and the information in the PDCCH, so that the UE can obtain more specific system information than the system information obtained through the initial cell search (S102). Here, the system information received by the UE is cell common system information for normal operation of the UE in the physical layer in the radio resource control (RRC), and is called residual system information, or system information block (SIB) 1.

[0083] When the UE initially accesses the base station or does not have radio resources for signal transmission (i.e., a UE in RRC_IDLE mode), the UE may perform a random access procedure on the base station (operations S103 to S106). First, the UE may send a preamble through a physical random access channel (PRACH) (S103), and receive a response message for the preamble from the base station through a PDCCH and a corresponding PDSCH (S104). When the UE receives a valid random access response message, the UE sends data including an identifier of the UE, etc. to the base station through a physical uplink shared channel (PUSCH) indicated by a UL grant sent from the base station by the PDCCH (S105). Next, the UE waits to receive the PDCCH as an indication of the base station for conflict resolution. If the UE successfully receives the PDCCH through the UE's identifier (S106), the random access procedure terminates. The UE may obtain UE-specific system information for normal operation of the UE in the physical layer in the RRC layer during the random access procedure. When the UE obtains the UE-specific system information, the user enters the RRC connected mode (RRC_CONNECTED mode).

[0084] The RRC layer is used to generate or manage messages for controlling the connection between the UE and the radio access network (RAN). In more detail, in the RRC layer, the base station and the UE can perform broadcasting cell system information required for each UE in the cell, management of mobility and switching, measurement reporting of the UE, storage management including UE capability management and device management. Generally, because the update period of the signal transmitted in the RRC layer is longer than the transmission time interval (TTI) in the physical layer, the RRC signal is not changed and maintained for a considerable interval.

[0085] After the above process, the UE receives PDCCH / PDSCH (S107) and sends a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a regular UL / DL signal transmission process. In particular, the UE can receive downlink control information (DCI) through the PDCCH. The DCI may include control information, such as resource allocation information for the UE. In addition, the format of the DCI may vary depending on the intended use. The uplink control information (UCI) sent by the UE to the base station through the UL includes DL / UL ACK / NACK signals, channel quality indicators (CQI), precoding matrix indexes (PMI), rank indicators (RI), and the like. Here, CQI, PMI, and RI may be included in channel state information (CSI). In a 3GPP NR system, the UE can send control information such as the above-mentioned HARQ-ACK and CSI through PUSCH and / or PUCCH.

[0086] Figure 4 Illustration of SS / PBCH blocks used for initial cell access in a 3GPP NR system.

[0087] When the power is turned on or when accessing a new cell is desired, the UE may acquire time and frequency synchronization with the cell and perform an initial cell search procedure. The UE may detect the physical cell identifier N of the cell during the cell search procedure. cell ID To this end, the UE may receive a synchronization signal, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station and synchronize with the base station. In this case, the UE may obtain information such as a cell identifier (ID).

[0088] refer to Figure 4 (a), the synchronization signal (SS) will be described in more detail. The synchronization signal can be classified into PSS and SSS. PSS can be used to obtain time domain synchronization and / or frequency domain synchronization, such as OFDM symbol synchronization and time slot synchronization. SSS can be used to obtain frame synchronization and cell group ID. Figure 4(a) and Table 2, the SS / PBCH block can be configured with 20 consecutive RBs (=240 subcarriers) on the frequency axis, and can be configured with 4 consecutive OFDM symbols on the time axis. In this case, in the SS / PBCH block, the PSS is sent in the first OFDM symbol through the 56th to 182nd subcarriers, and the SSS is sent in the third OFDM symbol. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol in which the PSS is sent, the base station does not send signals through the remaining subcarriers (i.e., the 0th to 55th and 183rd to 239th subcarriers). In addition, in the third OFDM symbol in which the SSS is sent, the base station does not send signals through the 48th to 55th and 183rd to 191st subcarriers. The base station sends the physical broadcast channel (PBCH) through the remaining REs other than the above-mentioned signals in the SS / PBCH block.

[0089] [Table 2]

[0090]

[0091] The combination of the three PSS and SSS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each group including three unique identifiers. Specifically, each physical layer cell ID is only part of one physical layer cell identifier group. cell ID =3N (1) ID +N (2) ID The physical layer cell identifier group may be represented by an index N ranging from 0 to 335. (1) ID and an index N ranging from 0 to 2 indicating a physical layer identifier in the physical layer cell identifier group (2) ID The UE can detect the PSS and identify one of 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 of the PSS PSS (n) are as follows.

[0092] d PSS (n) = 1-2x(m)

[0093]

[0094] 0≤n<127

[0095] Here, x(i+7)=(x(i+4)+x(i))mod2 and is given as [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0]

[0096] In addition, the sequence d of SSS SSS (n) are as follows.

[0097]

[0098]

[0099]

[0100] 0≤n<127

[0101] Here, and is given as

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

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

[0104] A radio frame having a length of 10 ms may be divided into two half frames having a length of 5 ms. Figure 4(b) The time slot in which the SS / PBCH block is sent in each half frame will be described. The time slot in which the SS / PBCH block is sent can be any of cases A, B, C, D and E. In case A, the subcarrier spacing is 15kHz, and the starting time point of the SS / PBCH block is the ({2, 8}+14*n)th symbol. In this case, n=0 or 1 at a carrier frequency of 3GHz or less. In addition, at a carrier frequency higher than 3GHz and lower than 6GHz, it may be n=0, 1, 2, 3. In case B, the subcarrier spacing is 30kHz, and the starting time point of the SS / PBCH block is {4, 8, 16, 20}+28*n. In this case, at a carrier frequency of 3GHz or less, n=0. In addition, at a carrier frequency higher than 3GHz and lower than 6GHz, it may be n=0, 1. In case C, the subcarrier spacing is 30kHz, and the start time point of the SS / PBCH block is the ({2, 8}+14*n)th symbol. In this case, n=0 or 1 at a carrier frequency of 3GHz or lower. In addition, at a carrier frequency higher than 3GHz and lower than 6GHz, it may be n=0, 1, 2, 3. In case D, the subcarrier spacing is 120kHz, and the start time point of the SS / PBCH block is the ({4, 8, 16, 20}+28*n)th symbol. In this case, at a carrier frequency of 6GHz 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 240kHz, and the start time point of the SS / PBCH block is the ({8, 12, 16, 20, 32, 36, 40, 44}+56*n)th symbol. In this case, at a carrier frequency of 6 GHz or higher, n=0, 1, 2, 3, 5, 6, 7, 8.

[0105] Figure 5 Figure 1 shows a process for transmitting control information and control channels in a 3GPP NR system. Figure 5(a), the base station may add a cyclic redundancy check (CRC) masked with a radio network temporary identifier (RNTI) (e.g., an XOR operation) to control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more UEs may 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). In addition, the UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. Thereafter, the base station may perform rate matching according to the amount of resources used for PDCCH transmission after performing channel coding (e.g., polarity coding) (S206). Thereafter, the base station may multiplex DCI according to a PDCCH structure based on a control channel element (CCE) (S208). In addition, the base station may apply additional processing (S210) such as scrambling, modulation (e.g., QPSK), interleaving, etc. to the multiplexed DCI, and then map the DCI to the resource to be transmitted. CCE is a basic resource unit for PDCCH, and one CCE may include multiple (e.g., six) resource element groups (REGs). One REG may be configured with multiple (e.g., 12) REs. The number of CCEs used for one PDCCH may be defined as an aggregation level. In a 3GPP NR system, an aggregation level of 1, 2, 4, 8, or 16 may be used. Figure 5 (b) is a schematic diagram related to CCE aggregation levels and multiplexing of PDCCHs, and illustrates types of CCE aggregation levels for one PDCCH and CCEs transmitted in the control region according thereto.

[0106] Figure 6 Illustration of a control resource set (CORESET) where a physical downlink control channel (PUCCH) can be sent in a 3GPP NR system.

[0107] CORESET is a time-frequency resource in which PDCCH (i.e., a control signal for UE) is transmitted. In addition, the search space described later can be mapped to one CORESET. Therefore, the UE can monitor the time-frequency domain designated as the CORESET instead of monitoring all frequency bands for PDCCH reception, and decode the PDCCH mapped to the CORESET. The base station can configure one or more CORESETs for each cell to the UE. The CORESET can be configured with up to three consecutive symbols on the time axis. In addition, the CORESET can be configured in units of six consecutive PRBs on the frequency axis. Figure 5In the embodiment of FIG. 1 , CORESET#1 is configured with continuous PRBs, and CORESET#2 and CORESET#3 are configured with discontinuous PRBs. A CORESET can be located in any symbol in a time slot. For example, in Figure 5 In the embodiment of the present invention, CORESET#1 starts from the first symbol of the time slot, CORESET#2 starts from the fifth symbol of the time slot, and CORESET#9 starts from the ninth symbol of the time slot.

[0108] Figure 7 A method for setting a PUCCH search space in a 3GPP NR system is illustrated.

[0109] In order to send the PDCCH to the UE, each CORESET may have at least one search space. In an embodiment of the present disclosure, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) through which the PDCCH of the UE can be sent. The search space may include a common search space that requires UEs of 3GPP NR to search together, and a terminal-specific or UE-specific search space that requires a specific UE to search. In the common search space, the UE can monitor the set PDCCH so that all UEs in the cell belonging to the same base station search together. In addition, a UE-specific search space can be set for each UE so that the UE monitors the PDCCH allocated to each UE at different search space positions according to the UE. In the case of a UE-specific search space, due to the limited control area in which the PDCCH can be allocated, the search space between UEs can be partially overlapped and allocated. Monitoring the PDCCH includes blind decoding of the PDCCH candidates in the search space. When the blind decoding is successful, it can be expressed that the PDCCH is detected / received (successfully), and when the blind decoding fails, it can be expressed that the PDCCH is not detected / received or not successfully detected / received.

[0110] For ease of explanation, a PDCCH that is scrambled with a group common (GC) RNTI previously known to one or more UEs so that DL control information is sent to one or more UEs is referred to as a group common (GC) PDCCH or a common PDCCH. In addition, a PDCCH that is scrambled with a specific terminal RNTI that is already known to a specific UE so that UL scheduling information or DL ​​scheduling information is sent to a specific UE is referred to as a specific UE PDCCH. The common PDCCH may be included in a common search space, and the UE-specific PDCCH may be included in a common search space or a UE-specific PDCCH.

[0111] The base station may signal information about resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH) as transport channels (i.e., DL grant) or information about resource allocation of an uplink shared channel (UL-SCH) and a hybrid automatic repeat request (HARQ) (i.e., UL grant) to each UE or UE group through the PDCCH. The base station may send a PCH transport block and a DL-SCH transport block through the PDSCH. The base station may send data that does not include specific control information or specific service data through the PDSCH. In addition, the UE may receive data that does not include specific control information or specific service data through the PDSCH.

[0112] The base station can include information about which UE (one or more UEs) the PDSCH data is sent to and how the corresponding UE receives and decodes the PDSCH data in the PDCCH, and send the PDCCH. For example, assume that the DCI sent on a specific PDCCH is a CRC masked with an RNTI of "A", and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., frequency position) of "B" and indicates the transmission format information of "C" (e.g., transport block size, modulation scheme, coding information, etc.). The UE monitors the PDCCH using the 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 received PDCCH information.

[0113] Table 3 shows an embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0114] [Table 3]

[0115]

[0116] PUCCH can be used to transmit the following UL control information (UCI).

[0117] - Scheduling Request (SR): information for requesting UL UL-SCH resources.

[0118] -HARQ-ACK: A response to the PDCCH (indicating a DL SPS release) and / or a response to a DL transport block (TB) on the PDSCH. HARQ-ACK indicates whether the information sent on the PDCCH or PDSCH is received. The HARQ-ACK response includes a positive ACK (simple ACK), a negative ACK (hereinafter referred to as NACK), a discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used in a mixed manner with HARQ-ACK / NACK and ACK / NACK. Generally, ACK can be represented by a bit value of 1, while NACK can be represented by a bit value of 0.

[0119] - Channel State Information (CSI): Feedback information about DL channels. The UE generates feedback information about DL channels based on the CSI Reference Signal (RS) sent by the base station. Feedback information related to Multiple Input Multiple Output (MIMO) includes Rank Indicator (RI) and Precoding Matrix Indicator (PMI). According to the information indicated by the CSI, the CSI can be divided into CSI Part 1 and CSI Part 2.

[0120] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, various channel environments, and frame structures.

[0121] PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on the time axis and one PRB on the frequency axis. When PUCCH format 0 is transmitted in two OFDM symbols, the same sequence on the two symbols can be transmitted through different RBs. In this case, the sequence can be a sequence (CS) cyclically shifted from the basic sequence used in PUCCH format 0. As a result, the UE can obtain frequency diversity gain. In more detail, the UE can select the optimal frequency diversity gain according to the M bit UCI(M bit =1 or 2) to determine the cyclic shift (CS) value m cs In addition, the CS value m can be calculated by cs The cyclic shift sequence is mapped to one OFDM symbol and 12 REs of one RB to transmit a basic sequence of length 12. When the number of cyclic shifts available to the UE is 12 and M bit =1, the 1-bit UCI 0 and 1 can be mapped to two cyclic shift sequences, which have a difference of 6 in cyclic shift value. In addition, when M bit =2, the 2-bit UCI 00, 01, 11 and 10 may be mapped to four cyclic shift sequences having a difference of 3 in the cyclic shift value, respectively.

[0122] PUCCH format 1 can convey 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 can be transmitted through continuous OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 can be one of 4 to 14. More specifically, M bit =1 UCI is modulated by BPSK. The UE can use quadrature phase shift keying (QPSK) to modulate M bit =2 UCI. The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a sequence of length 12. In this case, the sequence can be the basic sequence for PUCCH format 0. The UE spreads the even-numbered OFDM symbols of PUCCH format 1 allocated by the time axis orthogonal cover code (OCC) to send the obtained signal. PUCCH format 1 determines the maximum number of different UEs multiplexed in one RB according to the length of the OCC used. The demodulation reference signal (DMRS) can be spread together with the OCC and mapped to the odd-numbered OFDM symbols of PUCCH format 1.

[0123] PUCCH format 2 can convey more than 2 bits of UCI. PUCCH format 2 can be transmitted through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted in two OFDM symbols, the sequences transmitted in different RBs through the two OFDM symbols can be identical to each other. Here, the sequence can be a plurality of modulated complex-valued symbols d(0), ..., d(M symbol -1). Here, M symbol It can be M bit / 2. Through this, the UE can obtain frequency diversity gain. More specifically, M bit UCI (M bit >2) RBs that are bit-level scrambled, QPSK modulated, and mapped to one or two OFDM symbols. Here, the number of RBs can be one of 1 to 16.

[0124] PUCCH format 3 or PUCCH format 4 can convey more than 2 bits of UCI. PUCCH format 3 or PUCCH format 4 can be transmitted through continuous OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 can be one of 4 to 14. Specifically, the UE modulates M with π / 2 binary phase shift keying (BPSK) or QPSK. bit The UCI of Mbit (Mbit>2) is used to generate complex-valued symbols d(0) to d(Mbit). symb -1). Here, when π / 2-BPSK is used, M symb =Mbit , and when using QPSK, M symb =M bit / 2. The UE may not apply block unit extension to PUCCH format 3. However, the UE may apply block unit extension to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length 12, so that PUCCH format 4 can have two or four multiplexing capabilities. The UE performs transmit precoding (or DFT precoding) on ​​the extended signal and maps it to each RE to transmit the extended signal.

[0125] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may 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 may 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 can be used by PUCCH format 2, PUCCH format 3, or PUCCH format 4, the UE may transmit only the remaining UCI information without transmitting some UCI information according to the priority of the UCI information.

[0126] PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured by RRC signaling to indicate frequency hopping in a time slot. When frequency hopping is configured, the index of the RB to be frequency hopped may be configured with an RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted through N OFDM symbols on the time axis, the first hop may have a lower limit of (N / 2) OFDM symbols and the second hop may have an upper limit of (N / 2) OFDM symbols.

[0127] PUCCH format 1, PUCCH format 3 or PUCCH format 4 can be configured to be repeatedly transmitted in multiple time slots. In this case, K time slots for repeated transmission of PUCCH can be configured by RRC signaling. The repeatedly transmitted PUCCH must start from an OFDM symbol at a constant position in each time slot and have a constant length. When one OFDM symbol among the OFDM symbols of the time slot in which the UE should send PUCCH is indicated as a DL symbol by RRC signaling, the UE may not send PUCCH in the corresponding time slot and delay the transmission of PUCCH to the next time slot to send PUCCH.

[0128] Meanwhile, in the 3GPP NR system, the UE can perform transmission / reception using a bandwidth equal to or less than the bandwidth of the carrier (or cell). To this end, the UE can receive a bandwidth portion (BWP) of a continuous bandwidth configured with some bandwidths in the carrier bandwidth. A UE operating according to TDD or in an unpaired spectrum can receive up to four DL / UL BWP pairs in one carrier (or cell). In addition, the UE can activate one DL / UL BWP pair. A UE operating according to FDD or in a paired spectrum can receive up to four DL BWPs on a DL carrier (or cell) and up to four ULBWPs on a UL carrier (or cell). The UE can activate one DL BWP and one UL BWP for each carrier (or cell). In addition to the activated BWP, the UE may not perform reception or transmission in the time-frequency resources. The activated BWP may be referred to as an active BWP.

[0129] The base station may indicate the activated BWP among the BWPs configured by the UE through downlink control information (DCI). The BWP indicated by the DCI is activated, and the other configured BWPs are deactivated. In a carrier (or cell) operating in TDD, the base station may include a bandwidth part indicator (BPI) in the DCI for scheduling PDSCH or PUSCH, which indicates the BWP to be activated to change the DL / UL BWP pair of the UE. The UE may receive the DCI for scheduling PDSCH or PUSCH, and may identify the DL / UL BWP pair activated based on the BPI. For a DL carrier (or cell) operating in FDD, the base station may include a BPI indicating the BWP to be activated in the DCI for scheduling PDSCH to change the DL BWP of the UE. For a UL carrier (or cell) operating in FDD, the base station may include a BPI indicating the BWP to be activated in the DCI for scheduling PUSCH to change the UL BWP of the UE.

[0130] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0131] Carrier aggregation is a method in which a UE uses multiple frequency blocks or cells configured with UL resources (or component carriers) and / or DL ​​resources (or component carriers) (logically) as one large logical frequency band so that the wireless communication system uses a wider frequency band. One component carrier may also be referred to as a primary cell (PCell) or a secondary cell (SCell) or a primary SCell (PScell). However, hereinafter, for ease of description, the term "component carrier" is used.

[0132] refer to Figure 8As an example of a 3GPP NR system, the entire system band may include up to 16 component carriers, and each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically contiguous subcarriers. Figure 8 In the figure, each component carrier is shown to have the same bandwidth, which is only an example, and each component carrier may have a different bandwidth. Moreover, although each component carrier is shown as being adjacent to each other on the frequency axis, the drawings are shown in a logical concept, and each component carrier may be physically adjacent to each other or may be spaced apart.

[0133] A different center frequency can be used for each component carrier. Alternatively, a common center frequency can be used in physically adjacent component carriers. Figure 8 In the embodiment of the present invention, all component carriers are physically adjacent, and the center frequency A can be used in all component carriers. In addition, assuming that the component carriers are not physically adjacent to each other, the center frequency A and the center frequency B can be used in each component carrier.

[0134] When the entire system frequency band is extended by carrier aggregation, the frequency band used to communicate with each UE can be defined in units of component carriers. UE A can use 100 MHz as the entire system frequency band and perform communication using all five component carriers. UE B1~B5 can only use 20 MHz bandwidth and perform communication using one component carrier. UE C1 and C2 can use 40 MHz bandwidth and perform communication using two component carriers respectively. The two component carriers can be logically / physically adjacent or non-adjacent. UE C1 represents the case of using two non-adjacent component carriers, and UE C2 represents the case of using two adjacent component carriers.

[0135] Fig. 9 is a diagram for explaining signal carrier communication and multi-carrier communication. In particular, Fig. 9 (a) shows a single carrier subframe structure and Fig. 9 (b) shows a multi-carrier subframe structure.

[0136] refer to Fig. 9 (a), in FDD mode, a general wireless communication system may perform data transmission or reception through one DL frequency band and one UL frequency band corresponding thereto. In another specific embodiment, in TDD mode, a wireless communication system may divide a radio frame into UL time units and DL time units in the time domain, and perform data transmission or reception through UL / DL time units. Fig. 9 (b), three 20MHz component carriers (CCs) can be aggregated into each of UL and DL, so that a bandwidth of 60MHz can be supported. Each CC may be adjacent or non-adjacent to each other in the frequency domain. Fig. 9 (b) shows the case where the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetrical, but the bandwidth of each CC can be determined independently. In addition, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CC allocated / configured to a specific UE through RRC may be referred to as a serving DL / UL CC for the specific UE.

[0137] The base station can perform communication with the UE by activating some or all of the UE's serving CCs or deactivating some CCs. The base station can change the CC to be activated / deactivated, and can change the number of CCs to be activated / deactivated. If the base station allocates CC allocations available for the UE as cell-specific or UE-specific, at least one of the allocated CCs can be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is switched. One CC that is not deactivated by the UE is called a primary CC (PCC) or a primary cell (PCell), and a CC that the base station can freely activate / deactivate is called a secondary CC (SCC) or a secondary cell (SCell).

[0138] At the same time, 3GPP NR uses the concept of cells to manage radio resources. A cell is defined as a combination of DL resources and UL resources, that is, a combination of DL CCs and UL CCs. A cell can be configured with DL resources alone, or a combination of DL resources and UL resources. When carrier aggregation is supported, the link between the carrier frequency of DL resources (or DL ​​CCs) and the carrier frequency of UL resources (or UL CCs) can be indicated by system information. The carrier frequency refers to the center frequency of each cell or CC. The cell corresponding to the PCC is called PCell, and the cell corresponding to the SCC is called SCell. The carrier corresponding to the PCell in the DL is the DL PCC, and the carrier corresponding to the PCell in the UL is the UL PCC. Similarly, the carrier corresponding to the SCell in the DL is the DL SCC, and the carrier corresponding to the SCell in the UL is the UL SCC. Depending on the capabilities of the UE, the serving cell can be configured with one PCell and zero or more SCells. For a UE that is in the RRC_CONNECTED state but is not configured for carrier aggregation or does not support carrier aggregation, there is only one serving cell configured with only the PCell.

[0139] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" referring to a specific geographical area where communication services are provided by one base station or one antenna group. That is, one component carrier may 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 between a cell referring to a certain geographical area and a cell of carrier aggregation, in the present disclosure, a cell of carrier aggregation is referred to as a CC, and a cell of a geographical area is referred to as a cell.

[0140] Fig.10 : is a schematic diagram showing an example in which cross-carrier scheduling technology is applied. When cross-carrier scheduling is set, the control channel sent through the first CC can use the carrier indicator field (CIF) to schedule the data channel sent through the first CC or the second CC. The CIF is included in the DCI. In other words, a scheduling cell is set, and the DL grant / UL grant sent in the PDCCH area of ​​the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, there are search areas for multiple component carriers in the PDCCH area of ​​the scheduling cell. The PCell can basically be a scheduling cell, and a specific SCell can be designated as a scheduling cell by the upper layer.

[0141] exist Fig.10 In the embodiment of the present invention, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCC (or SCell). In addition, it is assumed that DL PCC is set as PDCCH monitoring CC. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) higher signaling, CIF is disabled, and each DL CC can only send PDCCH for scheduling PDSCH of DL CC without CIF according to NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). At the same time, if cross-carrier scheduling is configured by UE-specific (or UE group-specific or cell-specific) higher layer signaling, CIF is enabled, and a specific CC (e.g., DL PCC) can send not only PDCCH for scheduling PDSCH of DL CC A using CIF but also PDCCH for scheduling PDSCH of another CC (cross-carrier scheduling). On the other hand, PDCCH is not sent in another DL CC. Therefore, the UE monitors the PDCCH not including the CIF to receive the PDSCH scheduled by the self-carrier, or monitors the PDCCH including the CIF to receive the PDSCH scheduled by the cross-carrier, depending on whether the cross-carrier scheduling is configured for the UE.

[0142] on the other hand, Fig. 9 and Fig.10The subframe structure of the 3GPP LTE-A system is shown in the figure, and the same or similar configuration can be applied to the 3GPP NR system. However, in the 3GPP NR system, Fig. 9 and Fig.10 The subframes may be replaced by time slots.

[0143] Fig.11 is a block diagram showing the configuration of a UE and a base station according to an embodiment of the present disclosure. In an embodiment of the present disclosure, the UE can be implemented by various types of wireless communication devices or computing devices that are guaranteed to be portable and mobile. The UE may be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), etc. In addition, in an embodiment of the present disclosure, the base station controls and manages cells (e.g., macro cells, femto cells, micro cells, etc.) corresponding to the service area, and performs functions such as signal transmission, channel designation, channel monitoring, self-diagnosis, relaying, etc. The base station may be referred to as a next generation node B (gNB) or an access point (AP).

[0144] As shown in the drawings, the UE 100 according to an embodiment of the present disclosure may include a processor 110 , a communication module 120 , a memory 130 , a user interface 140 , and a display unit 150 .

[0145] First, the processor 110 may execute various instructions or programs within the UE 100 and process data. In addition, the processor 110 may control the entire operation of each unit including the UE 100, and may control the transmission / reception of data between the units. Here, the processor 110 may be configured to perform operations according to the embodiments described in the present disclosure. For example, the processor 110 may receive time slot configuration information, determine the time slot configuration based on the time slot configuration information, and perform communication according to the determined time slot configuration.

[0146] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards (NICs) in an internal or external form, such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123. In the drawings, the communication module 120 is shown as an integrally integrated module, but unlike the drawings, each network interface card may be independently arranged according to a circuit configuration or purpose.

[0147] The cellular communication interface card 121 may send or receive a radio signal 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 may include at least one NIC module using a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 121 may independently perform cellular communication with at least one of the base station 200, the external device, and the server according to a cellular communication standard or protocol in a frequency band less than 6 GHz supported by a corresponding NIC module.

[0148] The cellular communication interface card 122 may send or receive a radio signal 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 the second frequency band based on an instruction from the processor 110. According to one embodiment, the cellular communication interface card 122 may include at least one NIC module using a frequency band greater than 6 GHz. At least one NIC module of the cellular communication interface card 122 may independently perform cellular communication with at least one of the base station 200, the external device, and the server according to a cellular communication standard or protocol in a frequency band of 6 GHz or more supported by a corresponding NIC module.

[0149] The unlicensed band communication interface card 123 transmits or receives a radio signal with at least one of the base station 200, the external device, and the server by using the third frequency band as the unlicensed frequency band, and provides a communication service of the unlicensed frequency band based on an instruction from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module using the unlicensed frequency band. For example, the unlicensed frequency band may be a frequency band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensed band communication interface card 123 may independently or non-independently perform wireless communication with at least one of the base station 200, the external device, and the server according to the unlicensed frequency band communication standard or frequency band protocol of the frequency band supported by the corresponding NIC module.

[0150] The memory 130 stores a control program used in the UE 100 and various data therefor. Such a control program may include a prescribed program required for performing wireless communication with at least one of the base station 200, an external device, and a server.

[0151] Next, the user interface 140 includes various input / output devices provided in the UE 100. In other words, the user interface 140 may receive user input using various input devices, and the processor 110 may control the UE 100 based on the received user input. In addition, the user interface 140 may perform output based on instructions from the processor 110 using various output devices.

[0152] Next, the display unit 150 outputs various images on the display screen. The display unit 150 may 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.

[0153] In addition, the base station 200 according to an embodiment of the present disclosure may include a processor 210 , a communication module 220 , and a memory 230 .

[0154] First, the processor 210 may execute various instructions or programs and process internal data of the base station 200. In addition, the processor 210 may control the overall operation of the units in the base station 200 and control data transmission and reception between the units. Here, the processor 210 may be configured to perform operations according to the embodiments described in the present disclosure. For example, the processor 210 may signal a time slot configuration and perform communication according to the signaled time slot configuration.

[0155] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards in an internal or external form, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223. In the drawings, the communication module 220 is shown as an integrally integrated module, but unlike the drawings, each network interface card may be independently arranged according to a circuit configuration or purpose.

[0156] The cellular communication interface card 221 may send or receive a radio signal 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 first frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 221 may include at least one NIC module using a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 221 may independently perform cellular communication with at least one of the base station 100, the external device, and the server according to a cellular communication standard or protocol in a frequency band less than 6 GHz supported by a corresponding NIC module.

[0157] The cellular communication interface card 222 may send or receive a radio signal 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 the second frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 222 may include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 may independently perform cellular communication with at least one of the base station 100, the external device, and the server according to a cellular communication standard or protocol in a frequency band of 6 GHz or higher supported by a corresponding NIC module.

[0158] The unlicensed band communication interface card 223 transmits or receives a radio signal with at least one of the base station 100, the external device, and the server by using the third frequency band as the unlicensed frequency band, and provides a communication service of the unlicensed frequency band based on an instruction from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module using the unlicensed frequency band. For example, the unlicensed frequency band may be a frequency band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensed band communication interface card 223 may independently or non-independently perform wireless communication with at least one of the base station 100, the external device, and the server according to the unlicensed frequency band communication standard or frequency band protocol of the frequency band supported by the corresponding NIC module.

[0159] Fig.11 1 is a block diagram illustrating a UE 100 and a base station 200 according to an embodiment of the present disclosure, and the blocks shown respectively are logically divided elements of the device. Therefore, according to the design of the device, the above-mentioned elements of the device can be installed in a single chip or multiple chips. In addition, a part of the configuration of the UE 100, for example, a user interface 140, a display unit 150, etc., can be selectively provided in the UE 100. In addition, if necessary, a user interface 140, a display unit 150, etc. can be additionally provided in the base station 200.

[0160] Fig.12 A resource set used in a wireless communication system according to an embodiment of the present invention is illustrated.

[0161] The base station may use a resource set (RESET), which is a set of time-frequency resources for indicating whether the UE can use the corresponding resources to receive the physical data channel. In more detail, the base station may use the resource set to signal the time-frequency resources that the UE cannot use to receive the physical data channel. The UE may determine the time-frequency resources corresponding to at least one RESET by using at least an RRC signal for initial cell access. In a specific embodiment, the base station may use a field of DCI to indicate in which RESET the UE cannot receive the physical data channel. For ease of description, the field of the DCI indicating whether the RESET can be used to receive the physical data channel is referred to as the RESET field. When rate matching is used for physical data channel reception, the RESET field may be referred to as a rate matching indicator. In addition, when perforation is used to receive the physical data channel, the RESET field may be referred to as a perforation indicator. The base station may use an RRC signal to indicate one or more RESETs. In more detail, the base station may indicate the time-frequency resources corresponding to the RESET by using an RRC signal. In addition, the base station may use L1 signaling or a DCI that schedules the physical data channel to indicate whether one or more RESETs cannot be used to receive the physical data channel. In this case, the base station may use an RRC signal to signal the length of the field of the DCI for indicating whether one or more RESETs may be used for physical data channel reception. In addition, depending on the RESET configuration of the base station, the RESET may include all or part of the above-mentioned CORESET. In more detail, the RESET may be specified in units of CORESET. For example, the RESET may be specified in units of a single CORESET or multiple CORESETs.

[0162] The UE may receive a physical data channel based on a time-frequency resource, in which the time-frequency resource scheduled for the UE's physical data channel reception overlaps with the time-frequency resource corresponding to a RESET indicated as unavailable for physical data channel reception. In this case, the time-frequency resource scheduled for the UE's physical data channel reception may indicate the time-frequency resource scheduled by the DCI of the physical control channel for the UE's physical data channel reception. In more detail, the DCI for scheduling the physical data channel may indicate to the UE the time-frequency resource in which the physical data channel reception is scheduled by the time domain information and frequency domain information of the time-frequency resource in which the physical data channel reception is scheduled. In this case, the time domain information may include the index of the starting OFDM symbol of the time slot in which the physical data channel reception is scheduled. In addition, the DCI for scheduling the physical data channel may use information indicating the frequency band in which the UE's physical data channel reception is scheduled to indicate the time-frequency resource in which the UE's physical data channel reception is scheduled. In this case, information may be indicated in units of PRBs or PRB groups, which indicates the frequency band in which the physical data channel reception is scheduled. In more detail, the UE may determine the remaining time-frequency resources, except for the RESET indicated as unavailable for receiving the physical data channel, among the time-frequency resources scheduled for the physical data channel reception as resources for receiving the physical data channel. The UE determines the time-frequency resources scheduled for the UE's physical data channel reception according to the DCI that schedules the physical data channel. Through this, the UE can determine the time-frequency resources, in which the time-frequency resources corresponding to the RESET configured with the RRC signal overlap with the time-frequency resources scheduled for the physical data channel reception indicated by the DCI. For ease of description, the time-frequency resources in which the time-frequency resources corresponding to the RESET configured for the UE overlap with the time-frequency resources scheduled for the physical data channel reception are referred to as overlapping resource sets (overlapping-RESET). If the time-frequency resources corresponding to the RESET that can be used for the physical data channel reception do not overlap with the time-frequency resources scheduled for the physical data channel reception, the UE can determine that the physical data channel reception is available among all the time-frequency resources scheduled for the physical data channel reception. Specifically, when the time-frequency resources corresponding to RESET that can be used for physical data channel reception overlap with the time-frequency resources scheduled for physical data channel reception, the UE can receive the physical data channel by performing rate matching based on the RESET field transmitted in the DCI that schedules the physical data channel. In this case, the UE can receive the physical data channel by performing rate matching in time-frequency resources other than the time-frequency resources corresponding to RESET, wherein the RESET field indicates that physical data channel reception is unavailable in the frequency resources in which the physical data channel is scheduled.In another specific embodiment, when the time-frequency resources corresponding to the RESET that cannot be used for physical data channel reception overlap with the time-frequency resources scheduled for physical data channel reception, the UE can perform puncturing based on the RESET field. In this case, the UE can receive the physical data channel by performing puncturing on the time-frequency resources corresponding to the RESET in which the RESET field indicates that the physical data channel reception is not available in the time-frequency resources in which the physical data channel is scheduled. In addition, if the time-frequency resources corresponding to the RESET that cannot be used for physical data channel reception and the time-frequency resources scheduled for physical data channel reception do not overlap, the UE can determine that the physical data channel reception is available in all time-frequency resources scheduled for physical data channel reception, regardless of the value of the RESET field.

[0163] According to the above description, time-frequency resources can be configured for the UE, and the time-frequency resources may not be able to receive the physical data channel according to the RRC signal, and the UE can determine the time-frequency resources that cannot be actually used for the reception of the physical data channel among the corresponding time-frequency indicated by the DCI. If the base station only uses the RRC signal to configure the time-frequency resources that cannot be used for the reception of the physical data channel, because the availability of the resources changes over time, even if the resources are actually available for the reception of the physical data channel, the resources may not always be available. Therefore, the spectrum efficiency may be reduced. If the base station only indicates the time-frequency resources that should not be used for the reception of the physical data channel through the DCI, because the base station must send all the information related to the time-frequency resources that cannot be used for the reception of the physical data channel through the DCI signal each time, the overhead of the physical control channel may increase. Therefore, according to an embodiment of the present invention, the base station can increase the spectrum efficiency or reduce the overhead of the physical control channel through a combination of DCI and RRC signals.

[0164] exist Fig.12 In the embodiment of , the first RESET RESET#1 and the second RESET RESET#2 are configured in the nth time slot through the RRC signal. Fig.12 In the embodiment of (a), the time-frequency resources scheduled for PDSCH reception by the UE through DCI overlap with the first RESET RESET#1. Therefore, the UE determines the time-frequency resources in which the time-frequency resources scheduled for PDSCH reception by the UE through DCI overlap with the first RESET RESET#1 as overlapping RESET. Fig.12In the embodiment of (b), the time-frequency resources scheduled for PDSCH reception by the UE through DCI overlap with a portion of the first RESET RESET#1. In addition, the time-frequency resources scheduled for PDSCH reception by the UE through DCI overlap with a portion of the second RESET RESET#2. Accordingly, the UE determines the time-frequency resources in which the PDSCH reception of the UE scheduled by DCI overlaps with each of the first RESET RESET#1 and the second RESET RESET#2 as overlapping RESETs.

[0165] The UE may not be able to determine the time-frequency resources occupied by the RESET that is not configured for the UE in the current time slot, or the time-frequency resources may be determined only by separate signaling. In addition, it may be difficult for the UE to determine whether the RESET configured for the UE can receive the physical data channel in a future time slot. In addition, it may be difficult for the UE to determine the time-frequency resources occupied by the physical control channel of the CORESET included in the RESET configured for the UE in the future time slot. As a result, it may be difficult for the UE to determine the time-frequency resources used for the UE to perform physical data channel reception. Therefore, the UE may receive the starting symbol information of the position of the OFDM symbol indicating the start of the physical data channel transmission from the base station. In more detail, the UE may receive the starting symbol information from the base station by scheduling the DCI of the physical data channel. If the number of positions of the OFDM symbol that can be designated as the starting symbol of the start of the physical data channel transmission is K, the base station may use ceil (log2K) bits to send the starting symbol information. In this case, ceil (x) represents the smallest integer equal to or greater than x. In this case, the starting symbol can be specified for each time slot. Moreover, the UE can determine the position of the OFDM symbol at the start of the physical data channel transmission based on the starting symbol information. For example, when the OFDM symbol that can be designated as the start symbol is any one of the first to fourth OFDM symbols of the time slot, the base station can use 2 bits of DCI to send the start symbol information. In this case, when the value of the 2 bits corresponding to the start symbol information of the DCI is 00 b In this case, the UE can determine the starting symbol as the first OFDM symbol of the time slot. In addition, when the value of the two bits corresponding to the starting symbol information of the DCI is 01 b In addition, when the value of the 2 bits corresponding to the start symbol information of the DCI is 10 b When the UE determines the starting symbol as the third OFDM symbol of the time slot, the UE can determine the starting symbol as the third OFDM symbol of the time slot. In addition, when the value of the 2 bits corresponding to the starting symbol information of the DCI is 11 bWhen the UE determines the starting symbol as the fourth OFDM symbol of the time slot, the UE can receive the physical data channel based on the starting symbol information. In more detail, the UE can determine the time-frequency resource to start receiving the physical data channel based on the starting symbol information. Figures 13 to 24 A method for receiving a data channel by a UE is described. A method for determining time-frequency resources in which a UE receives a physical data channel will be described in detail.

[0166] Fig.13 FIG. 1 illustrates a time-frequency resource domain in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention.

[0167] The base station can determine the starting symbol information sent to the UE by signaling based on the RESET that overlaps with the time-frequency resources for scheduling the physical data channel in the time slot corresponding to the starting symbol information. Specifically, the base station can make a determination based on the nearest time resource among the time-frequency resources corresponding to the RESET, which overlaps with the time-frequency resources scheduled for the physical data channel in the time slot corresponding to the starting symbol information. In this case, the base station can determine the starting symbol information of the physical data channel based on the time-frequency resources of the RESET configured for the UE through the RRC configuration, so as not to overlap with the RESET configured for the UE that is not available for physical data channel reception. If the RESET does not overlap with the time-frequency resources corresponding to the frequency band scheduled for the physical data channel, the base station can start the physical data channel transmission from the first OFDM symbol of the corresponding frequency band. Specifically, if there is a frequency band in the time slot that is not configured with RESET, the base station can start the physical data channel transmission from the first OFDM symbol of the frequency band. Fig.12 The figure shows seven OFDM symbols of the nth time slot. Fig.12 In the embodiment of the present invention, the first RESET RESET#1 and the second RESET RESET#2 are configured in the nth time slot. In the frequency domain, the time-frequency resources scheduled for PDSCH reception of the UE overlap with the first RESET RESET#1, but do not overlap with the second RESET RESET#2. In addition, because the first RESET RESET#1 ends in the second OFDM symbol of the nth time slot, the base station can start PDSCH transmission from the third OFDM symbol of the nth time slot. In this case, the base station can set the value of the field indicating the starting symbol information of the DCI to 10b.

[0168] When at least some of the time-frequency resources scheduled for the physical data channel reception of the UE overlap with RESET, the base station may designate the OFDM symbol after the last OFDM symbol of the corresponding RESET as the starting symbol. The UE may not expect the reception of the physical data channel in the OFDM symbol corresponding to the RESET, which is not available for the physical data channel reception configured for the UE. In addition, the UE may expect the physical data channel reception from the OFDM symbol next to the last OFDM symbol of the RESET, which is not available for the physical data channel reception configured for the UE. In more detail, the UE may receive the physical data channel from the OFDM symbol next to the last OFDM symbol of the RESET, which is not available for the physical data channel reception.

[0169] In such an embodiment, even if the time-frequency resources are not used for other purposes, they may not be used for physical data channel transmission. In order to maximize the use of time-frequency resources, the UE may distinguish between the frequency bands in which the UE's physical data channel reception is scheduled, the frequency bands that overlap with the RESET configured for the UE and are not available for physical data channel reception, and the frequency bands that do not overlap with the RESET configured for the UE and are not available for physical data channel reception, and determine the starting time point of the physical data channel reception. In addition, the base station may specify the starting symbol information based on the last OFDM symbol among the OFDM symbols corresponding to the RESET not configured for the UE. Reference Fig.14 Describe this.

[0170] Fig.14 FIG. 1 illustrates a time-frequency resource region in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention.

[0171] As described above, the UE can distinguish between a frequency band overlapping with a RESET configured for the UE and not available for physical data channel reception among the frequency bands in which the physical data channel reception of the UE is scheduled and a frequency band not overlapping with the RESET configured for the UE, and determine the start time of the physical data channel reception. In addition, the base station can specify the starting symbol information based on the last OFDM symbol among the OFDM symbols corresponding to the RESET not configured for the UE. In more detail, the base station can indicate the OFDM symbol next to the last OFDM symbol among the OFDM symbols corresponding to the RESET not configured for the UE as the starting symbol. In a specific embodiment, in a frequency band overlapping with a RESET that is not available for physical data channel reception configured for the UE among the frequency bands in which the physical data channel reception of the UE is scheduled, the UE can expect physical data channel reception starting from the OFDM symbol next to the last OFDM symbol of the RESET in which the physical data channel reception configured for the UE is unavailable. In a specific embodiment, the UE may expect physical data channel reception from the OFDM symbol indicated by the start symbol information in a frequency band that does not overlap with a RESET that is not available for physical data channel reception configured for the UE among frequency bands for scheduling physical data channel reception. The reason for indicating the start symbol of the physical data channel is because the UE may determine a RESET that is not available for physical data channel reception configured for the UE, but may not determine a RESET configured for another UE.

[0172] Fig.14 The figure shows seven OFDM symbols of the nth time slot. Fig.14 In an embodiment, a first RESET CORESET#1 and a second RESET CORESET#2 are configured in the nth time slot. In this case, the first RESET CORESET#1 is a RESET that is not available for PDSCH reception configured for the UE, and the second RESET RESET#2 is a RESET configured for another UE. The PRB scheduled for PDSCH reception of the UE overlaps with the first RESET RESET#1, but does not overlap with the second RESET RESET#2. In this case, the last OFDM symbol of the first RESET RESET#1 is the second OFDM symbol of the nth time slot. In addition, the last OFDM symbol of the second RESET RESET#2 is the first OFDM symbol of the nth time slot. Fig.14 In the embodiment of (a), the base station designates the second OFDM symbol as the start symbol, and the second OFDM symbol is the OFDM symbol next to the last symbol of the second RESET RESET#2 not configured for the UE. In this case, the field value of the DCI corresponding to the start symbol information can be 01 b. In a frequency band overlapping with the first RESET RESET#1 among frequency bands for scheduling PDSCH reception of the UE, the UE starts receiving the PDSCH from the OFDM symbol next to the last OFDM symbol of the first RESET RESET#1. In addition, in a frequency band not overlapping with the first RESET RESET#1 among frequency bands for scheduling PDSCH reception of the UE, the UE starts receiving the PDSCH from the second OFDM symbol which is the OFDM symbol indicated by the start symbol information.

[0173] In another specific embodiment, when the time-frequency resources in which the physical data channel reception of the UE is scheduled overlap with the RESET not configured for the UE, the base station may indicate the OFDM symbol next to the last OFDM symbol of the RESET not configured for the UE as the starting symbol. When there is no RESET not configured for the UE that overlaps with the time-frequency resources scheduled for the physical data channel reception of the UE, the base station may designate the first OFDM symbol of the time slot as the starting symbol. Fig.14 In the embodiment of (b), since there is no RESET configured for the UE that overlaps with the PRB scheduled for PDSCH reception of the UE, the base station designates the first OFDM symbol as the start symbol. In this case, the field value of the DCI corresponding to the start symbol information may be 00. b . In a frequency band overlapping with the first RESET RESET#1 among frequency bands for scheduling PDSCH reception of the UE, the UE starts PDSCH monitoring from the OFDM symbol next to the last OFDM symbol of the first RESET RESET#1. In addition, in a frequency band not overlapping with the first RESET RESET#1 among frequency bands for scheduling PDSCH reception of the UE, the UE starts receiving PDSCH from the first OFDM symbol which is the OFDM symbol indicated by the start symbol information.

[0174] Only a portion of the time-frequency resources corresponding to the CORESET included in the RESET can be used for physical control channel transmission. In addition, the UE can determine the time-frequency resources in which the physical control channel of the UE is transmitted among the time-frequency resources corresponding to the RESET, in which the physical data channel reception configured for the UE is unavailable. Therefore, the frequency resources not used for physical control channel transmission among the time-frequency resources corresponding to the RESET can be used for physical data channel transmission. In this case, the UE can assume that the physical data channel will not be sent to the time-frequency resources in which the physical control channel is received among the time-frequency resources corresponding to the RESET in which the physical data channel reception configured for the UE is unavailable. The UE can receive the physical data channel by performing rate matching on the remaining time-frequency resources except the corresponding time-frequency resources or by puncturing the time-frequency resources. Reference Figure 15 to Figure 16 Describe this.

[0175] Figure 15 to Figure 16 It is illustrated that a UE of a wireless communication system according to an embodiment of the present invention receives a PDSCH in a RESET configured for the UE.

[0176] Regardless of whether the physical data channel reception configured for the UE overlaps with an unavailable RESET, the UE can receive the physical data channel from the OFDM symbol indicated by the start symbol information in the frequency band in which the physical data channel reception of the UE is scheduled. In this case, when the RESET configured for the UE includes a CORESET and the physical control channel is received in the CORESET, the UE can puncture the time-frequency resources used for physical control channel transmission to receive the physical data channel. In addition, when the RESET configured for the UE includes a CORESET, and the UE receives a physical control channel in the corresponding CORESET, the UE can receive the physical data channel by performing rate matching on the remaining time-frequency resources except the time-frequency resources used for the corresponding physical control channel transmission.

[0177] Figure 15 to Figure 16 The figure shows seven OFDM symbols of the nth time slot. Figure 15 to Figure 16 In an embodiment, a first RESET RESET#1 and a second RESET RESET#2 are configured in the nth time slot. In this case, the first RESETCORESET#1 is a RESET for which PDSCH reception configured for the UE is unavailable, and the second RESET RESET#2 is a RESET configured for another UE. The PRB scheduled for PDSCH reception of the UE overlaps with the first RESET RESET#1, but does not overlap with the second RESET RESET#2. In this case, the last OFDM symbol of the first RESET RESET#1 is the second OFDM symbol of the nth time slot. In addition, the last OFDM symbol of the second RESET RESET#2 is the first OFDM symbol of the nth time slot. Fig.15 In an embodiment of the present invention, in a frequency band in which PDSCH reception of the UE is scheduled, the PDSCH is received from the second OFDM symbol indicated by the start symbol information. In this case, the UE punctures the PRB used for PDCCH transmission in the RESET configured for the UE and receives the PDSCH.

[0178] In another specific embodiment, the UE may receive the physical data channel from the first OFDM symbol of a frequency band overlapping a RESET in which the physical data channel reception configured for the UE is unavailable, among the frequency bands in which the physical data channel reception is scheduled. In this case, the UE may puncture the time-frequency resources used for physical control channel transmission in the RESET configured for the UE, and receive the physical data channel. In addition, the UE may receive the physical data channel by performing rate matching on the remaining time-frequency resources other than the time-frequency resources used for physical control channel transmission in the RESET configured for the UE. The UE may receive the physical data channel from the OFDM symbol indicated by the start symbol information in a frequency band in which the physical data channel reception is scheduled, among the frequency bands in which the physical data channel reception configured for the UE does not overlap with the unavailable RESET.

[0179] exist Fig.16 In an embodiment, the UE receives the PDSCH from the first OFDM symbol of a frequency band overlapping with a RESET in which the PDSCH reception configured for the UE is unavailable, among the frequency bands in which the PDSCH reception of the UE is scheduled. In this case, the UE may puncture the PRB for PDCCH transmission in the RESET in which the PDSCH reception configured for the UE is unavailable, and receive the PDSCH. In addition, the UE may receive the PDSCH by performing rate matching on the remaining time-frequency resources except the PRB for PDCCH transmission in the RESET in which the PDSCH reception configured for the UE is unavailable. In addition, the UE monitors the PDSCH from the second OFDM symbol indicated by the start symbol information in a frequency band that does not overlap with a RESET in which the PDSCH reception configured for the UE is unavailable, among the frequency bands in which the PDSCH reception of the UE is scheduled.

[0180] In such an embodiment, the base station may Figure 13 to Figure 14 The described embodiments configure the start symbol.

[0181] The base station may divide a time slot into multiple frequency bands and send a start symbol with a signal in each of the multiple frequency bands. The base station may send multiple start symbol information corresponding to the multiple start symbols with a signal through DCI. In this case, the UE may receive the physical data channel based on the information of the multiple start symbols. This is because multiple RESETs may be configured in a time slot, and the multiple RESETs may be configured in different PRBs and OFDM symbols. In this case, the base station may configure the start symbol of the corresponding frequency band based on the latest OFDM symbol among the last OFDM symbol of the unavailable RESET received by the physical data channel, which overlaps with the time-frequency resources scheduled for the physical data channel reception of the UE in the corresponding frequency band. In more detail, the base station may configure the OFDM symbol next to the latest OFDM symbol among the last OFDM symbol of the unavailable RESET received by the physical data channel in the corresponding frequency band, which overlaps with the time-frequency resources scheduled for the physical data channel reception of the UE as the start symbol of the corresponding frequency band. In this case, when there is no RESET in the corresponding frequency band in which physical data channel reception is unavailable and which overlaps time-frequency resources with a physical data channel scheduled for the UE, the base station may configure the first OFDM symbol as the starting symbol of the corresponding frequency band.

[0182] In addition, the UE may start physical data channel reception based on a RESET in which physical data channel reception configured for the UE is unavailable or a time-frequency resource scheduled for physical data channel reception of the UE that overlaps with a physical data channel sent to the UE. In a specific embodiment, the UE may receive the physical data channel from the OFDM symbol immediately following the last OFDM symbol of the RESET in which the physical data channel reception configured for the UE is unavailable, which overlaps with the time-frequency resource scheduled for physical data channel reception of the UE in the corresponding frequency band, regardless of the starting symbol of the corresponding frequency band. In another specific embodiment, the UE may receive the physical data channel from the OFDM symbol immediately following the last OFDM symbol of the physical control channel sent to the UE, which overlaps with the time-frequency resource scheduled for physical data channel reception of the UE in the corresponding frequency band, regardless of the starting symbol of the corresponding frequency band.

[0183] The base station can send a physical control channel and a physical data channel scheduled by the corresponding physical control channel through different time slots. This scheduling scheme is called cross-slot scheduling. For example, the base station can send a physical control channel in the CORESET of the nth time slot. In this case, the physical control channel can schedule the physical data channel of the (n+k)th time slot. In this case, n is a natural number, and k is a natural number greater than 1. The position of the time-frequency resources occupied by the physical control channel mapped to the CORESET configured for the UE may vary in each time slot. Because whether the CORESET is used for the physical data channel is determined according to the physical control channel allocation of the base station, whether the RESET including the corresponding CORESET is unavailable for physical data channel reception may vary in each time slot. Therefore, when cross-slot scheduling is performed, it may be difficult for the base station or UE to determine the time-frequency resources used for physical data channel transmission in the time slot in which the physical data channel scheduled by the cross-slot scheduling is sent. Therefore, when cross-slot scheduling is used, the starting symbol configuration method and signaling method corresponding to the physical data channel are problematic. Reference will be made to Fig.17 Describe this.

[0184] Fig.17 It is illustrated that a UE receives a PDSCH when cross-slot scheduling is performed in a wireless communication system according to an embodiment of the present invention.

[0185] When the physical data channel is scheduled by cross-slot scheduling, the position of the start symbol can be fixed to a specific OFDM symbol of the time slot in which the physical data channel is transmitted. In this case, a specific OFDM symbol can be configured based on the last OFDM symbol of the RESET configured for the UE. In more detail, the specific OFDM symbol can be the OFDM symbol next to the last OFDM symbol of the RESET configured for the UE. For example, when the last symbol of the RESET configured for the UE is the third OFDM symbol of the corresponding time slot, the specific OFDM symbol can be the fourth OFDM symbol. The base station can signal a specific OFDM symbol through an RRC signal or periodically transmitted system information. In this case, the UE can determine the start symbol corresponding to the physical data channel scheduled by time slot scheduling based on the RRC signal or the system information. In addition, the start symbol corresponding to the physical data channel scheduled by cross-slot scheduling can be configured for each of the multiple frequency bands. In more detail, the start symbol corresponding to the physical data channel scheduled by cross-slot scheduling can be configured for each PRB or each specific number of continuous PRBs. In another specific embodiment, a start symbol corresponding to a physical data channel scheduled by cross-slot scheduling may be commonly configured in all frequency bands of a cell. In another specific embodiment, a base station may signal a start symbol by performing DCI of a physical control channel scheduled across time slots.

[0186] The UE can receive the physical data channel by performing rate matching on time-frequency resources other than time-frequency resources in which the physical data channel is scheduled and RESET overlap among the time-frequency resources of the physical data channel scheduled by cross-time slot scheduling. In addition, the UE can receive the physical data channel by performing rate matching on time-frequency resources in which the physical data channel is scheduled and RESET overlap among the time-frequency resources of the physical data channel scheduled by cross-time slot scheduling. In addition, the operation of the UE to receive the physical data channel can be applied to the above reference Fig.17 The embodiments described in the previous figures.

[0187] As described above, the DCI that schedules the physical data channel can indicate whether RESET can be used for physical data channel reception by using the RESET field. In this case, the RESET field can be used for purposes other than the above. In detail, when the physical data channel is scheduled by cross-slot scheduling, the RESET field can indicate in which time slot the physical data channel is scheduled. This is because when the physical data channel is scheduled in a future time slot by cross-slot scheduling, it may be difficult for the base station to determine which RESET cannot be used in the time slot in which the physical data channel is scheduled during cross-slot scheduling. When the RESET field is used for other purposes, the UE can assume that the time-frequency resources corresponding to the configured RESET are not available for the physical data channel.

[0188] exist Fig.17 In the embodiment of , the PDCCH transmitted in the nth time slot schedules the PDSCH transmitted in the (n+1)th time slot. The position of the starting symbol used when receiving the PDSCH scheduled by cross-slot scheduling in all frequency bands in the corresponding cell is the third OFDM symbol, which is the symbol next to the last symbol of RESET#1 overlapping with the PDSCH in the frequency domain. Therefore, the UE receives the PDSCH starting from the third OFDM symbol in the (n+1)th time slot. In addition, the RESET field indicates that the PDSCH is scheduled in the (n+1)th time slot. Therefore, the UE receives the PDSCH starting from the third OFDM symbol in the (n+1)th time slot.

[0189] The base station can use one physical control channel to schedule PDSCHs sent in multiple time slots. This scheduling scheme is called slot aggregation-based scheduling. For example, the base station can send a physical control channel in the RESET of the nth time slot. In this case, the physical control channel can schedule the physical data channels of the nth time slot, the (n+1)th time slot...the (n+k)th time slot. In this case, n is a natural number, and k is a natural number greater than 1. The position of the time-frequency resources occupied by the physical control channel mapped to the RESET configured for the UE may vary in each time slot. Therefore, when performing scheduling based on slot aggregation, it may be difficult for the base station or UE to determine the time-frequency resources used for physical data channel transmission in the time slot in which the physical data channel scheduled by the scheduling based on slot aggregation is sent. Therefore, when using scheduling based on slot aggregation, the starting symbol configuration method and signaling method corresponding to the physical data channel are problematic. Reference will be made to Figure 18 to Figure 19 Describe this.

[0190] Fig.18 and Fig.19 It is illustrated that a UE receives a PDSCH when slot aggregation-based scheduling is performed in a wireless communication system according to an embodiment of the present invention.

[0191] When scheduling physical data channels in multiple future time slots, the UE can start physical data channel reception based on a constant OFDM symbol position in multiple time slots. Specifically, when scheduling physical data channels by scheduling based on time slot aggregation, the UE can start physical data channel reception based on a constant OFDM symbol position in all time slots where the physical data channels scheduled by scheduling based on time slot aggregation are transmitted. Specifically, when scheduling physical data channels by scheduling based on time slot aggregation, the position of the starting symbol corresponding to all time slots where the physical data channels scheduled by scheduling based on time slot aggregation are transmitted can be configured to the same specific OFDM symbol of the time slot where the corresponding physical data channel is transmitted. In this case, a specific OFDM symbol can be configured based on the last OFDM symbol where RESET can be located in each time slot. In more detail, the specific OFDM symbol can be the OFDM symbol of the last OFDM symbol of RESET configured for the UE. For example, when the last symbol of the configured RESET is the third OFDM symbol of the corresponding time slot, the specific OFDM symbol can be the fourth OFDM symbol. The base station may signal a specific OFDM symbol through an RRC signal or periodically transmitted system information. In this case, the UE may determine the starting symbol corresponding to all time slots in which the physical data channels scheduled by scheduling based on slot aggregation are transmitted based on the RRC signal or the system information. In addition, the starting symbol corresponding to all time slots in which the physical data channels scheduled by scheduling based on slot aggregation are transmitted may be configured for multiple frequency bands. In more detail, the starting symbol corresponding to all time slots in which the physical data channels scheduled by scheduling based on slot aggregation are transmitted may be configured for each PRB or a specific number of consecutive PRBs. In another specific embodiment, the starting symbol corresponding to all time slots in which the physical data channels scheduled by scheduling based on slot aggregation are transmitted may be commonly configured in all frequency bands of the cell. According to another specific embodiment, the base station may signal the starting symbol through the DCI of the physical control channel for performing scheduling based on slot aggregation.

[0192] When physical data channels are scheduled in multiple future time slots, the UE may receive the physical data channels in the same RESET in each of the multiple future time slots. In more detail, the RESET field may be equally applied to all time slots where physical data channels scheduled by scheduling based on time slot aggregation are transmitted. According to another specific embodiment, the DCI for the physical control channel for scheduling based on time slot aggregation may indicate a start symbol corresponding to any one of all time slots, in which the physical data channels scheduled by scheduling based on time slot aggregation are transmitted. The RESET field may indicate whether RESET may be used for physical data channel reception in any one of the multiple time slots, in which the physical data channels scheduled by scheduling based on time slot aggregation are transmitted. In this case, any one time slot may be a time slot in which the physical control channel including the DCI for scheduling the physical data channel is transmitted. When scheduling based on time slot aggregation is used, the UE may assume that it cannot be used for physical data channel reception in the time-frequency resource corresponding to RESET in the time slot not indicated by the RESET field among the time slots where the physical data channels scheduled by scheduling based on time slot aggregation are transmitted.

[0193] exist Fig.18 In the embodiment of the present invention, the PDCCH transmitted in the nth time slot schedules the PDSCH transmitted in the nth time slot and the PDSCH transmitted in the (n+1)th time slot. The position of the starting symbol used when receiving the PDSCH scheduled by the time slot aggregation-based scheduling in all frequency bands in the corresponding cell is the third OFDM symbol. Therefore, the UE receives the PDSCH starting from the third OFDM symbol in the nth time slot and the (n+1)th time slot.

[0194] In the above-mentioned embodiment, the position of the starting symbol corresponding to all time slots in which the physical data channel scheduled by scheduling based on time slot aggregation is transmitted is the same. According to another specific embodiment, the DCI for the physical control channel for scheduling based on time slot aggregation may indicate the starting symbol corresponding to any one of all time slots in which the physical data channel scheduled by scheduling based on time slot aggregation is transmitted. In more detail, the DCI for the physical control channel for scheduling based on time slot aggregation may indicate the starting symbol corresponding to the first time slot among all time slots in which the physical data channel scheduled by scheduling based on time slot aggregation is transmitted. In another specific embodiment, the DCI for the physical control channel for scheduling based on time slot aggregation may indicate the starting symbol of the time slot in which the physical control channel for scheduling based on time slot aggregation is transmitted. In these embodiments, the starting symbol of the time slot may be fixed to a constant specific OFDM symbol, in which the physical data channel for which the DCI for the physical control channel for scheduling based on time slot aggregation does not indicate the position of the starting symbol is transmitted. For ease of description, the starting symbol corresponding to the physical data channel in which the DCI for the physical control channel for scheduling based on slot aggregation does not indicate the position of the starting symbol is referred to as the remaining starting symbol. In the method and signaling method for configuring the position of the remaining starting symbol, the above embodiment can be applied in the same manner to the embodiment in which the position of the starting symbol corresponding to all time slots in which the physical data channel scheduled by scheduling based on slot aggregation is transmitted is the same. Specifically, a specific OFDM symbol can be configured based on the last OFDM symbol of the configured RESET. In more detail, the specific OFDM symbol can be the OFDM symbol of the last OFDM symbol of the RESET configured for the UE. The base station can signal a specific OFDM symbol through an RRC signal or periodically transmitted system information. In this case, the UE can determine the position of the remaining starting symbol based on the RRC signal or the system information. In addition, the remaining starting symbols can be configured for multiple frequency bands. In more detail, the remaining starting symbols can be configured for each PRB or each specific number of continuous PRBs. In another specific embodiment, the remaining starting symbols can be configured to be common to all frequency bands of the cell.

[0195] exist Fig.19In an embodiment of the present invention, the PDCCH transmitted in the nth time slot schedules the PDSCH transmitted in the nth time slot and the PDSCH transmitted in the (n+1)th time slot. In this case, the PDCCH indicates the starting symbol of the nth time slot as the first OFDM symbol. In addition, the position of the starting symbol used when receiving the remaining PDSCH for which the starting symbol is not indicated in the PDCCH is the second OFDM symbol. Therefore, the UE monitors the PDSCH from the first OFDM symbol in the nth time slot and monitors the PDSCH from the second OFDM symbol in the (n+1)th time slot.

[0196] In a time slot after a time slot in which a physical control channel for scheduling based on time slot aggregation is transmitted, the UE can receive a physical data channel by performing rate matching on time-frequency resources other than time-frequency resources in which the physical data channel is scheduled and RESET overlap among time-frequency resources for scheduling the physical data channel based on time slot aggregation. As described above, the value of the RESET field can be applied to a time slot after a time slot in which a physical control channel for scheduling based on time slot aggregation is transmitted. In this case, the UE can perform rate matching on time-frequency resources other than time-frequency resources in which the physical data channel is scheduled and RESET overlaps among time-frequency resources for scheduling the physical data channel based on time slot aggregation. In addition, in a time slot after the time slot in which the physical control channel for scheduling based on time slot aggregation is transmitted, the UE can receive the physical data channel by puncturing time-frequency resources other than the time-frequency resources in which the physical data channel is scheduled and the RESET overlap among the time-frequency resources in which the physical data channel is scheduled through scheduling based on time slot aggregation. As described above, the value of the RESET field can be applied to the time slot after the time slot in which the physical control channel for scheduling based on time slot aggregation is transmitted. In this case, the UE can puncture the time-frequency resources in which the physical data channel is scheduled and the RESET overlap with the time-frequency resources for receiving an unavailable physical data channel among the time-frequency resources in which the physical data channel is scheduled through scheduling based on time slot aggregation. In addition, the operation of the UE to receive the physical data channel can be applied to the above reference Fig.17 The embodiments described in the previous figures.

[0197] The base station may divide the overlapping RESET into multiple sub-resource sets and indicate whether each sub-resource set is unavailable for physical data channel reception. In addition, the UE may also determine whether each sub-resource set is unavailable for physical data channel reception. In more detail, the UE may receive a DCI including an N-bit field indicating N sub-resource sets from the base station. In this case, each bit of the N-bit field may indicate whether each of the N sub-resource sets is unavailable for physical data channel reception. Fig. 20 Describe this.

[0198] Fig. 20 An example of a sub-resource set used in a wireless communication system according to an embodiment of the present invention is illustrated.

[0199] As described above, the base station can indicate whether a sub-resource set can be used for physical data channel reception by using an N-bit field. For ease of description, this field is referred to as a sub-resource set bitmap. If there is an overlapping RESET, the corresponding overlapping RESET can be divided into N sub-resource sets. In this case, each bit of the sub-resource set bitmap can indicate whether each of the N sub-resource sets can be used for physical data channel reception. When the number of overlapping RESETs is less than N, each overlapping RESET can be configured into at least one sub-resource set. When the number of overlapping RESETs is greater than N, multiple overlapping RESETs can be configured into one sub-resource set. In addition, when the number of overlapping RESETs is N, each of the N overlapping RESETs can be configured into a sub-resource set.

[0200] When an overlapping RESET is configured into multiple sub-resource sets, the sub-resource sets can be configured based on the time domain without distinguishing in the frequency domain. In this case, the sub-resource sets can be configured based on the ODFM symbols occupied by the overlapping RESET. Fig. 20 (a) illustrates an example of sub-resource sets configured based on the time domain.

[0201] In addition, when an overlapping RESET is configured into multiple sub-resource sets, the sub-resource set can be configured based on the frequency domain without distinguishing in the time domain. In this case, the sub-resource set can be configured based on the PRB occupied by the overlapping RESET. In this case, the sub-resource set may include only continuous PRBs. In another specific embodiment, the sub-resource set may include non-continuous PRBs. In a specific embodiment, the overlapping RESET may be configured into M sub-resource sets. In this case, when the overlapping RESET occupies X PRBs, M-1 sub-resource sets may be configured to occupy floor(X / M) PRBs, and one sub-resource set may be configured to occupy X-(M-1)*floor(X / M) PRBs. In this case, floor(x) represents the maximum natural number equal to or less than x. Fig. 20 (b) and 20(d) illustrate examples of sub-resource sets configured based on the frequency domain.

[0202] In addition, when an overlapping RESET is configured into multiple sub-resource sets, the sub-resource sets may be configured based on the frequency domain. In this case, the sub-resource sets may be configured based on the OFDM symbols and the PRBs occupied by the overlapping RESETs. In this case, the sub-resource sets may include only consecutive PRBs. In another specific embodiment, the sub-resource sets may include non-consecutive PRBs. Fig. 20 (c) and 20(e) illustrate examples of sub-resource sets configured based on the time-frequency domain.

[0203] If the overlapping RESET includes multiple RESETs, the multiple RESETs may be preferably configured into a sub-resource set. In more detail, bits of the overlapping RESET bitmap may be first allocated to the multiple RESETs.

[0204] According to another specific embodiment, the base station may distinguish the time-frequency resources scheduled for physical data channel reception of the UE regardless of the overlapping RESET, and may signal whether the distinguished resources can be used for physical data channel reception. In more detail, the time-frequency resources scheduled for physical data channel reception of the UE may be equally divided into 2 based on the frequency domain. N In this case, the base station may use the N-bit field of L1 signaling or the N-bit field of DCI to signal whether it can be used for physical data channel reception of the UE. The UE may determine the time-frequency resources that can be used for physical data channel reception based on the value of the N-bit field of L1 signaling or the N-bit field of DCI.

[0205] Fig.21 It is illustrated that a UE according to an embodiment of the present invention receives a PDSCH based on overlapping RESET in a wireless communication system.

[0206] As described above, if the subresource set bitmap included in the DCI that schedules the physical data channel indicates that the PDSCH is transmitted in the subresource set, the UE can receive the physical data channel in the subresource set. When the PDCCH is received in the time-frequency domain corresponding to the subresource set, the UE can receive the physical data channel by puncturing the time-frequency domain occupied by the physical control channel. In addition, when the physical control channel is received in the time-frequency domain corresponding to the subresource set, the UE can receive the physical data channel by performing rate matching on the remaining subresource sets except the time-frequency domain occupied by the physical control channel. Fig.21 In the embodiment of , the first RESET RESET#1 and the second RESET RESET#2 are configured by the RRC signal in the nth time slot. Fig.21 In an embodiment, the time-frequency resources scheduled for PDSCH reception of the UE through DCI overlap with a portion of the first RESET RESET # 1. In addition, the DCI does not indicate that the first RESET RESET # 1 is not available for PDSCH reception. Therefore, the UE determines the time-frequency resources in which the time-frequency resources for PDSCH reception of the UE are scheduled and overlap with the first RESET RESET # 1 as overlapping RESETs through DCI. In this case, the PDCCH is received through the time-frequency resources corresponding to the overlapping RESET. The UE can receive the PDSCH by puncturing the time-frequency domain occupied by the PDCCH. In addition, the UE can receive the PDSCH by performing rate matching in the overlapping RESETs other than the time-frequency domain occupied by the PDCCH.

[0207] As described above, the base station may use an RRC signal to configure a RESET. When the base station uses an RRC signal to configure a RESET, a method of indicating a time-frequency resource corresponding to at least one RESET may be problematic. Figure 22 to Figure 24 Describe this.

[0208] The base station may signal the index of the PRB occupied by RESET and the index of the OFDM symbol occupied by RESET to indicate the time-frequency resources corresponding to RESET. When RESET occupies continuous time-frequency resources, the base station may use an indication value to indicate the continuous time-frequency resources. In this case, the indication value is referred to as a resource indication value (RIV), and the indication method is referred to as a RIV method. In more detail, the base station may generate one RIV by combining the starting position of the continuous resources and the number of continuous resources. In more detail, when RESET occupies continuous OFDM symbols, the base station may generate the RIV using the starting index of the OFDM symbol and the index of the last OFDM symbol. In addition, when RESET occupies continuous PRBs and continuous OFDM symbols, the base station may generate one RIV based on the index of the PRB, and generate the RIV based on the index of the OFDM symbol. In this case, the base station may send two RIV values. In another specific embodiment, one value may be generated by encoding two RIVs. In this case, the base station may signal the time-frequency resources occupied by RESET by sending only one generated value. Reference will be made to Figures 27 to 30 The method of generating RIV is described in detail.

[0209] If the time-frequency resources occupied by RESET are non-continuous, the base station may signal the time-frequency resources occupied by RESET using a bitmap. In addition, when the base station signals the time-frequency resources occupied by RESET, the base station may also signal a monitoring period corresponding to RESET. For example, when the monitoring period of RESET is two time slots, the UE may determine that there is a corresponding RESET every two time slots. In addition, when the base station signals the time-frequency resources occupied by RESET, the base station may signal information about the CORESET included in the RESET. The information about the CORESET may include at least one of information about resource element group (REG) bundling and information about mapping of control channel elements (CCE) to REGs.

[0210] The base station needs to signal a connection relationship between RESET and a bit field of L1 signaling indicating RESET. At this time, the bit field may be the above-mentioned RESET field. The base station may indicate a bit field index of L1 signaling corresponding to RESET to signal a connection relationship between RESET and a bit field of L1 signaling indicating RESET. L1 signaling may be a DCI for scheduling a physical data channel. In addition, L1 signaling may be a group common DCI transmitted in a time slot in which a physical data channel is transmitted. According to a specific embodiment, regardless of the physical data channel allocation information, the base station may signal a connection relationship between RESET and a bit field of L1 signaling indicating RESET. For example, the RESET field may be n bits. In order for the base station to signal the i-th bit of the RESET field to indicate whether the RESET is not available for physical data reception, the base station may signal i through an RRC signal for configuring the corresponding RESET. If the value of the i-th bit of the RESET field is 1, the UE may determine that the time-frequency resources corresponding to the corresponding RESET cannot be used for physical data channel reception. In addition, when the value of the i-th bit of the RESET field is 0, the UE may determine that the physical data channel is received from the time-frequency resource corresponding to the RESET. The bit of the RESET field corresponding to the RESET that does not overlap with the time-frequency resource in which the physical data channel is scheduled may be used for other purposes. In this case, the time-frequency resource in which the physical data channel is scheduled may be indicated by the resource allocation (RA) field. In more detail, it may indicate whether the time-frequency resources corresponding to different RESETs are not available in the physical data channel reception. For example, the first bit of the RESET field may indicate whether the physical data channel reception is available in the first RESET RESET#1 and the second RESET RESET#2, and the second bit may indicate whether the physical data channel reception is available in the third RESET RESET#3 and the fourth RESET RESET#4. In this case, the first RESET RESET#1 and the second RESET RESET#2 overlap with the time-frequency resource in which the physical data channel is scheduled. The third RESET RESET#3 and the fourth RESET RESET#4 do not overlap with the time-frequency resource in which the physical data channel is scheduled. In this case, the first bit of the RESET field may not indicate whether the physical data channel reception is available in the first RESET RESET#1 and the second RESET RESET#2, but may indicate whether the physical data channel reception is available in the first RESET RESET#1.In addition, the first bit of the RESET field may not indicate whether the physical data channel reception is available in the third RESET RESET#3 and the fourth RESET RESET#4, but may indicate whether the physical data channel reception is available in the second RESET RESET#2. If all RESETs indicated by any one bit of the RESET field do not overlap with the time-frequency resources in which the physical data channel is scheduled, the corresponding bit may indicate whether a specific CORESET or a RESET including the CORESET is used for the physical data channel reception.

[0211] In another specific embodiment, the base station may signal a connection relationship between a bit field of a RESET and a L1 signaling indicating a RESET based on a time-frequency resource in which a physical data channel is scheduled. For example, the base station may signal time-frequency resource information corresponding to the RESET to the UE. In this case, the UE may signal the connection relationship between the overlapping RESET and the L1 signaling using an RRC signal. Alternatively, the base station may implicitly signal the connection relationship between the overlapping RESET and the L1 signaling. Specifically, when the overlapping RESET is divided into a plurality of sub-resource sets, each of the RESETs may be identified by a different index. In this case, the bit indicating the sub-resource set among the plurality of bits constituting the rate matching indicator may be determined based on the index for identifying the RESET. In a specific embodiment, the UE may map the sub-resource sets to the bits of the RESET field in sequence. For example, the jth sub-resource set may be mapped to the ((j mod B)+1)th bit of the RESET field. In this case, B may indicate the number of bits of the RESET field. In addition, X mod Y may represent the remainder when X is divided by Y.

[0212] The time-frequency resources corresponding to different RESETs may overlap. In this case, the physical data channel reception method may be a problem in the time-frequency resources corresponding to the RESET of the UE. Figure 22 to Figure 24 Describe this.

[0213] Figure 22 to Figure 24 The diagram illustrates a situation in which time-frequency resources indicated as being occupied by different RESETs overlap.

[0214] When the base station configures RESET for the UE, the UE may assume that the RESETs do not overlap with each other. In detail, when the time-frequency resources corresponding to different RESETs overlap, the UE may determine that the corresponding time-frequency resources are included in one RESET and are not included in the remaining RESETs. In more detail, the UE may determine that the time-frequency resources overlapping in the RESET are included in any one of the RESETs based on the priority of the RESET. In this case, the priority of the RESET may be explicitly indicated in the RRC signal. In another specific embodiment, the priority of the RESET may be determined based on the order in which the RESETs are configured in the RRC signal. In another specific embodiment, the priority of the RESET may be determined based on the bit index of the RESET field to which the RESET is mapped. Moreover, the priority of the RESET including the CORESET receiving the physical control channel monitored by the UE may always be the highest. In addition, the priority of the RESET including the CORESET in which the UE receives the PDCCH may always be the highest.

[0215] exist Fig. 22 In the embodiment of , the time-frequency resources indicated as occupied by the first RESET RESET#1 overlap with the time-frequency resources indicated as occupied by the second RESET RESET#2. Fig. 22 In the embodiment of (a), the priority of the second RESET RESET#2 is higher than the priority of the first RESET RESET#1. Therefore, the time-frequency resources indicated as occupied by the first RESET RESET#1 overlap with the time-frequency resources indicated as occupied by the second RESET RESET#2 are included in the second RESET RESET#2 and are not included in the first RESET RESET#1. Fig. 22 In the embodiment of (b), the priority of the first RESET RESET#1 is higher than the priority of the second RESET RESET#2. Therefore, the time-frequency resources indicated as occupied by the first RESET RESET#1 overlap with the time-frequency resources indicated as occupied by the second RESET RESET#2 are included in the first RESET RESET#1 and are not included in the second RESET RESET#2.

[0216] In another specific embodiment, when the base station configures RESET for the UE, the UE may assume that the RESETs may overlap with each other. In this case, it is a problem when the bits of the RESET field corresponding to different RESETs indicate different information. For example, the bits of the bit field of the L1 signaling corresponding to the first RESET indicate whether it is not available for physical data channel reception in the first RESET, and the bits of the bit field of the L1 signaling corresponding to the second RESET may indicate whether it is available for physical data channel reception in the second RESET. In this case, the UE may give priority to any information. In more detail, priority may be given to information indicating that it can be used for physical data channel reception. Figure 23 to Figure 24 In the embodiment, Fig.23 As shown in (a), the time-frequency resources indicated as being occupied by the first RESET RESET#1 overlap with the time-frequency resources indicated as being occupied by the second RESET RESET#2. Fig.23 In the embodiment of (b), the RESET field indicates that the first RESET RESET #1 is not available for PDSCH reception, and indicates that the second RESET RESET #2 is available for PDSCH reception. Therefore, the UE receives the PDSCH in the second RESET RESET #2, which includes the time-frequency resources overlapped by the first RESET RESET #1 and the second RESET RESET #2. Fig.23 In the embodiment of (c), the RESET field indicates that the first RESET RESET#1 is available for PDSCH reception, and indicates that the second RESET RESET#2 is not available for PDSCH reception. Therefore, the UE receives the PDSCH in the first RESET RESET#1, which includes the time-frequency resources overlapped by the first RESET RESET#1 and the second RESET RESET#2.

[0217] In more detail, priority may be given to information indicating that it is not available for physical data channel reception. Fig.24 In the embodiment of (a), the RESET field indicates that the first RESET RESET#1 is not available for PDSCH reception, and indicates that the second RESET RESET#2 is available for PDSCH reception. Therefore, the UE receives the PDSCH in the second RESET RESET#2 excluding the time-frequency resources overlapped by the first RESET RESET#1 and the second RESET RESET#2. Fig.24In the embodiment of (b), the RESET field indicates that the first RESET RESET#1 is available for PDSCH reception and indicates that the second RESET RESET#2 is not available for PDSCH reception. Therefore, the UE receives the PDSCH in the first RESET RESET#1 excluding the time-frequency resources overlapped by the first RESET RESET#1 and the second RESET RESET#2.

[0218] In addition, when different RESETs overlap and the L1 signaling bit fields corresponding to different RESETs indicate different information, the UE can determine whether to give priority to information indicating that physical data channel reception is unavailable or to information indicating that physical data channel reception is available based on the RRC signal. In addition, the UE can independently determine which information to give priority to for each RESET. The UE can give priority to information that physical data channel reception is unavailable in the time-frequency resources corresponding to the first RESET, and can give priority to information that indicates that physical data channel reception is available in the time-frequency resources corresponding to the second RESET.

[0219] Fig.25 A time slot configuration used in a wireless communication system according to an embodiment of the present invention is illustrated.

[0220] A time slot may include seven OFDM symbols. In another specific embodiment, a time slot may include 14 OFDM symbols. The time slot may include a DL symbol for DL ​​transmission. In addition, the time slot may include a UL symbol for UL transmission. In addition, when a time slot changes from DL transmission to UL transmission or from UL transmission to DL transmission, it may include a GAP symbol that is not used for DL ​​transmission or UL transmission. This is because the base station and the UE need time to change from a transmit mode to a receive mode or from a receive mode to a transmit mode. The GAP symbol may be an OFDM symbol. In addition, the time slot may include an OFDM symbol for sending DL control information.

[0221] Fig.25Eight slot configurations are shown. In format 0, the slot includes only DL symbols DL. In format 1, the slot includes six DL symbols DL and one GAP symbol GP. In format 2, the slot includes five DL symbols DL, one GAP symbol GP and one UL symbol UL. In format 3, the slot includes four DL symbols DL, one GAP symbol GP and two UL symbols UL. In format 4, the slot includes three DL symbols DL, one GAP symbol GP and three UL symbols UL. In format 5, the slot includes two DL symbols DL, one GAP symbol GP and four UL symbols UL. In format 6, the slot includes one DL symbol DL, one GAP symbol GP and five UL symbols UL. In format 7, the slot includes six UL symbols UL and one GAP symbol GP. In format 8, the slot includes only UL symbols UL. For ease of description, a slot including only DL symbols, such as format 0, is referred to as a DL-only slot. A slot including only UL symbols, such as format 7, is referred to as an UL-only slot. A time slot including both DL and UL symbols, such as format 1 to format 6, is referred to as a mixed time slot. In a time slot other than a UL-only time slot, a CORESET for PDCCH transmission may be configured. In this case, a group-common PDCCH and a UE-specific PDCCH may be sent in the CORESET. One or more UEs may receive a group-common PDCCH. In addition, the group-common PDCCH may include time slot configuration information indicating a time slot configuration. In this case, the group-common PDCCH may include time slot configuration information for a time slot in which the PDCCH is transmitted. In addition, the group-common PDCCH may include time slot configuration information for a time slot in which the PDCCH is transmitted and a time slot in which the PDCCH is transmitted. In addition, the group-common PDCCH may include N future time slots and time slot configuration information for a time slot in which the PDCCH is transmitted. In this case, a future time slot corresponds to a time slot that is later in time than a time slot in which the PDCCH is transmitted. In addition, N is a natural number of 1 or greater. N may be changed dynamically. In addition, N may be configured by an RRC signal. In addition, the base stations may be dynamically indicated to the UE in a set configured in the RRC signal.

[0222] Will refer to Figure 26 to Figure 33 A method for signaling timeslot configuration information is described.

[0223] Fig.26 The diagram illustrates a UE-specific PDCCH in a wireless communication system according to an embodiment of the present invention that indicates scheduled resources to a UE.

[0224] exist Fig.26In an embodiment, a UE-specific PDCCH for a first UE UE1 indicates a time-frequency resource in which PDSCH reception of the first UE UE1 is scheduled. In addition, a UE-specific PDCCH for a second UE UE2 indicates a time-frequency resource scheduled for PUSCH reception of the second UE UE2. In this case, the base station may use an indication value to indicate continuous time-frequency resources. In more detail, in an LTE system, a base station uses an indication value to indicate continuous time-frequency resources. In this case, the indication value is referred to as a resource indication value (RIV), and the indication method is referred to as a RIV method. In more detail, the RIV may indicate the starting position of continuous resources and the number of continuous resources. The UE may determine the starting position of continuous resources allocated to the UE and the number of corresponding resources based on the RIV.

[0225] In the type 2 resource allocation of the LTE system, RIV is used as follows. If the DCI format of the PDCCCH is any one of 1A, 1B, and 1D, or the DCI format of the EPDCCH is any one of 1A, 1B, and 1D, or the DCI format of the MPDCCH is 6-1A, the DCI includes RIV. The base station can use RIV to indicate continuous resources in the frequency domain in which the physical data channel reception of the UE is scheduled. In this case, the UE can obtain the RB that is the starting RB of the continuous resources in the frequency domain scheduled by the DCI based on the RIV included in the DCI. start and L as the number of RBs of contiguous resources CRBs Therefore, the base station can determine the value of RIV according to the following equation.

[0226] if but

[0227]

[0228] otherwise

[0229]

[0230] Where L CRBs ≥1 and will not exceed

[0231] In this case, N DL RB is the total number of RBs that can be used for resource allocation for DL ​​transmission. When the second type (Type 2) resource allocation scheme is used for UL transmission, N DL RB Replace with N UL RB , N UL RB is the total number of RBs that can be used for resource allocation for UL transmission.

[0232] When the format of the PDCCH is 1C, the base station may indicate the scheduled resources to the UE in units of multiple RBs according to the second type (type 2) resource allocation scheme. Indicates the number of multiple RBs. In this case, the base station can configure the starting position of the continuous resources indicated by RIV as follows.

[0233]

[0234] In addition, the base station may configure the starting position of the continuous resources indicated by the RIV as follows.

[0235]

[0236] In this case, the base station can determine the value of RIV according to the following equation.

[0237] if but

[0238]

[0239] otherwise

[0240]

[0241] In this case, N DL RB is the total number of RBs that can be used for resource allocation for DL ​​transmission. When the second type (Type 2) resource allocation scheme is used for UL transmission, N DL RB Replace with N UL RB , which is the total number of RBs that can be used for resource allocation for UL transmission.

[0242] The base station can use the RIV to indicate the continuous resources in the time domain where the physical data channel reception of the UE is scheduled. In this case, the UE can obtain the S of the starting OFDM symbol as the continuous resources in the frequency domain scheduled by the DCI based on the RIV included in the DCI. start and L as the number of OFDM symbols of consecutive resources symbols . S start can be interpreted as the position in the time slot. For example, when S start = 0, S start It can indicate the first OFDM symbol of the time slot. symbol When is the total number of symbols received by the physical data channel allocated to the UE scheduled by DCI, the value of RIV is determined according to the following equation.

[0243] if but

[0244] RIV=N symbols (L symbols -1)+S start

[0245] otherwise

[0246] RIV=N symbols (N symbols -L symbols +1)+(N symbols -1-S start )

[0247] Where L symbols ≥1 and will not exceed N symbols -S start

[0248] The base station may indicate the scheduled resources to the UE in units of multiple OFDM symbols. Indicates the number of OFDM symbols. In this case, the base station can configure the starting position of the continuous resources indicated by RIV as follows.

[0249]

[0250] In addition, the number of consecutive OFDM symbols of consecutive resources indicated by RIV that the base station can configure is as follows.

[0251]

[0252] The base station can configure the value of RIV according to the following equation.

[0253] if but

[0254] RIV=N′ symbols (L′ symbols -1)+S′ start

[0255] otherwise

[0256] RIV=N′ symbols (N′ symbols -L′ symbols +1)+(N′ symbols -1-S′ start )

[0257] in and

[0258] where L′ symbols ≥1 and will not exceed N′ symbols -S′ start .

[0259] Fig. 27 The diagram illustrates sending two RIVs to a UE in a wireless communication system to indicate a scheduled time-frequency domain to the UE according to an embodiment of the present invention.

[0260] As described above, the base station can use RIV to indicate the time-frequency resources scheduled for PDSCH reception of the UE or the time-frequency resources scheduled for PUSCH transmission of the UE. In this case, the UE can receive PDSCH or send PUSCH in the time-frequency resources indicated by RIV. The base station can use the values ​​of RIV in the frequency domain and RIV in the time domain to indicate the scheduled resources to the UE. Specifically, the base station can indicate the time-frequency resources scheduled for the UE by independently indicating the RIV value in the frequency domain and the RIV value in the time domain. For ease of description, the RIV in the frequency domain is represented by RIV freq Indicates that the RIV in the time domain is represented by RIV time In a specific embodiment, the base station can send a RIV including two RIVs, namely, RIV freq and RIV time The DCI is used to indicate the time-frequency resources to which the PDSCH is allocated to schedule PDSCH reception.

[0261] exist Fig. 27 In the embodiment of the present invention, the base station sends RIV via DCI freq and RIV time In this case, the UE can determine the RIV freq and RIV time Specifically, according to the above embodiment, the UE receives the time-frequency domain indicated by RIV freq Get L CRB and RB start In addition, UE from RIV time Get L symbol and S start .

[0262] If the maximum value that RIV can represent is Q, then the length of the bit representing RIV is If the maximum number of RBs that the base station can use to schedule a UE is 6 and the maximum number of OFDM symbols is 9, then RIV freq The value of RIV is any one from 0 to 20. In this case, RIV time The value of RIV is any one from 0 to 44. Therefore, 5 bits are required to indicate RIV freq , and 6 bits are required to indicate RIV time Therefore, a total of 11 bits are required to indicate the scheduled time-frequency resources to the UE. If multiple RIVs can be encoded into one RIV, the number of bits used to send the RIV can be reduced. Fig.28 Describe this.

[0263] Fig.28 The diagram illustrates that in a wireless communication system according to an embodiment of the present invention, a base station sends two RIVs to a UE to indicate a scheduled time-frequency domain to the UE.

[0264] The base station can indicate the scheduled time-frequency resources to the UE by sending a RIV. In this case, the RIV can be a value generated by encoding two RIVs RIV1 and RIV2. The two RIVs can be the above-mentioned RIVs freq and RIV time The maximum value that RIV1 can have is denoted as RIV1 max In addition, the RIV generated by encoding two RIVs is called the final RIV RIV total The base station can determine the final RIV RIV according to the following equation total The value of .

[0265]

[0266] In addition, the UE can obtain the final RIV according to the following equation total Obtain RIV1 and RIV2.

[0267]

[0268]

[0269] In this case, RIV1 can be RIV freq Alternatively, RIV2 can be RIV time When the base station schedules time-frequency resources to the UE in units of one RB, the RIV can be determined according to the following equation: freq Maximum RIV freq max .

[0270]

[0271] When the base station schedules time-frequency resources to the UE in units of multiple RBs and the number of multiple RBs is expressed as When RIV is freq max .

[0272]

[0273] in this case, In this case, N DL RBis the total number of RBs that can be used for resource allocation for DL ​​transmission. If RIV is used for resources for UL transmission, N DL RB Replace with N UL RB , which is the total number of RBs that can be used for resource allocation for UL transmission.

[0274] In this case, RIV2 can be RIV time Alternatively, RIV1 may be RIV freq When the base station schedules time-frequency resources to the UE in units of one OFDM, the RIV can be determined according to the following equation: time The maximum RIV time max .

[0275]

[0276] When the base station schedules time-frequency resources to the UE in units of multiple OFDM symbols and the number of multiple RBs is expressed as When RIV is freq max .

[0277]

[0278] in this case,

[0279] exist Fig.28 In the embodiment, the base station sends a final RIV RIV via the DCI of the UE-specific PDCCH total According to the above embodiment, the UE obtains the final RIV RIV total Get RIV time and RIV freq UE from RIV freq Get L CRB and RB start In addition, UE from RIV time Get L symbols and S start .

[0280] In another specific embodiment, the base station may encode three or more RIVs to generate a final RIVRIV total , and DCI can be used to send the final RIV RIV total In this case, the base station can encode the two RIVs sequentially to generate the final RIV RIV totalFor example, the base station may encode three RIVs RIV1, RIV2, and RIV3 to generate the final RIV RIV total In this case, the base station may first encode the two RIVs RIV1 and RIV2 to generate an intermediate RIV. Thereafter, the base station may generate a final RIV RIV by encoding the intermediate RIV and the remaining RIV RIV3. total .

[0281] Through these embodiments, the base station can reduce the number of bits used for RIV transmission. For example, the UE can schedule six RBs and the UE can schedule nine OFDM symbols. In this case, RIV freq Can have any value from 0 to 20. In addition, RIV time It can have any value from 0 to 44. As in the above embodiment, when RIV is encoded freq and RIV time Generate final RIV RIV total When, the final RIV RIV total Can have a value from 0 to 944. Therefore, 10 bits are required to send the final RIV RIV total Specifically, when RIV follows this embodiment, it is different from when the base station sends RIV freq and RIV time Compared with each of the above, the DCI bits used for RIV transmission can be reduced by one bit. Table 4 shows the DCI bits used for RIV transmission according to the UE sending RIV freq and RIV time The number of RBs and OFDM symbols that can be scheduled when RIV is transmitted is the number of DCI bits required for RIV transmission. In addition, Table 5 shows the number of DCI bits required for RIV transmission according to the number of RBs and OFDM symbols that can be scheduled when RIV is transmitted. freq and RIV time Come send the final RIV RIV total The number of RBs and OFDM symbols that can be scheduled is the number of DCI bits required for RIV transmission. Through Tables 4 and 5, when the final RIV is transmitted by encoding multiple RIVs RIV total , it can be confirmed that the number of DCI bits required for RIV transmission can be reduced.

[0282] [Table 4]

[0283]

[0284] [Table 5]

[0285]

[0286] In the above-mentioned embodiment, only the final RIV RIV has been described. total Generating and Final RIV RIV total The transmission indication is a case where the time-frequency resources scheduled by DCI. However, the above embodiment is not limited to this and can also be applied to the case where the time-frequency resources are indicated by RIV. For example, when the base station schedules the time-frequency resources through the RRC signal, the above embodiment can be applied. In addition, when the base station indicates the pre-occupied time-frequency resources to the UE, the above embodiment can be applied. In this case, the pre-occupied time-frequency resources can indicate that the part of the time-frequency resources that have been scheduled for the UE is not scheduled for the UE.

[0287] According to the following embodiments, the base station may indicate to the UE the time resources for scheduling. In more detail, the base station may use an RRC signal to configure a time resource mapping table indicating the mapping of the physical data channel scheduled for the UE to the time resource. In this case, the RRC signal may be a UE-specific RRC signal. In addition, the base station may use any field included in the DCI to signal the state of the mapping table, which schedules the physical data channel reception or physical data channel transmission of the UE. The UE may determine the mapping table of the time resources configured by the base station based on the RRC signal, and determine the time resource domain in which the corresponding data channel is scheduled based on a field included in the DCI that schedules the physical data channel reception or physical data channel transmission of the UE. The number of states of the time resource mapping table may be 16. In this case, any one of the fields included in the DCI may be 4 bits. The time resource mapping table may include a K1 value indicating a HARQ-ACK transmission time slot, a time slot in which the physical data channel is transmitted, a first OFDM symbol scheduled for the physical data channel in the time slot in which the physical data channel is transmitted, and the number of OFDM symbols scheduled for the physical data channel, and a mapping type of the physical data channel. In this case, the mapping type of the physical data channel may indicate whether the position of the demodulation reference signal (DMRS) is determined independently of the position of the physical data channel. In a specific embodiment, the base station may configure the time slot in which the physical data channel is transmitted, the first OFDM symbol scheduled for the physical data channel in the time slot in which the physical data channel is transmitted, and the number of OFDM symbols scheduled for the physical data channel by using 6 bits of the RRC signal. For example, 2 bits out of 6 bits may represent the time slot in which the physical data channel is transmitted. The two bits indicating the time slot in which the physical data channel is transmitted are referred to as K0. K0 may represent the index difference between the time slot in which the UE receives the DCI and the time slot in which the physical data channel scheduled for the UE is transmitted. The value that K0 may have may be 00. b 、01 b , 10 b and 11 bWhen the value of K0 is 0, the time slot in which the UE receives the DCI and the time slot in which the scheduled physical data channel is sent to the UE may be the same. In addition, 4 bits of the 6 bits may indicate the first OFDM symbol scheduled for the physical data channel and the number of OFDM symbols scheduled for the physical data channel in the time slot in which the physical data channel is sent. In this case, the number of OFDM symbols scheduled for the physical data channel may be any one of 2, 4, 7, and 14. In more detail, according to the first OFDM symbol scheduled for the physical data channel and the number of OFDM symbols scheduled for the physical data channel, 4 bits may be mapped as shown in Table 6.

[0288] [Table 6]

[0289] state Starting symbol index length 0 0 2 1 2 2 2 4 2 3 6 2 4 8 2 5 10 2 6 12 2 7 0 4 8 2 4 9 4 4 10 6 4 11 8 4 12 10 4 13 0 7 14 7 7 15 0 14

[0290] When the OFDM symbol index of one slot is configured with 0 to 15, each state may represent the following OFDM symbols. The OFDM symbol indicated by the state value may be as follows. 0: {0, 1}, 1: {2, 3}, 2: {4, 5}, 3: {6, 7}, 4: {8, 9}, 5: {10, 11}, 6: {12, 13}, 7: {0, 1, 2, 3}, 8: {2, 3, 4, 5}, 9: {4, 5, 6, 7}, 10: {6, 7, 8, 9}, 11: {8, 9, 10, 11}, 12: {10, 11, 12, 13}, 13: {0, 1, 2, 3, 4, 5, 6}, 14: {7, 8, 9, 10, 11, 12, 13}, 15: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}. In this case, in X:{Y}, X represents a state value, and Y represents an OFDM symbol indicated by the X state.

[0291] In another specific embodiment, one of the six bits may indicate the time slot in which the physical data channel is transmitted. One bit indicating the time slot in which the physical data channel is transmitted is called K0. K0 may represent the index difference between the time slot in which the UE receives the DCI and the time slot in which the physical data channel scheduled for the UE is transmitted. The value that K0 may have may be any one of 0 and 1. If the value of K0 is 0, the time slot in which the UE receives the DCI and the time slot in which the scheduled physical data channel is transmitted to the UE may be the same. If the value of K0 is 1, the difference between the index of the time slot in which the UE receives the DCI and the index of the time slot in which the physical data channel scheduled for the UE is transmitted may be E. In this case, E may be fixed to 1 or other natural numbers. In addition, 5 of the 6 bits may indicate the first OFDM symbol scheduled for the physical data channel in the time slot in which the physical data channel is transmitted and the number of OFDM symbols scheduled for the physical data channel. In this case, the number of OFDM symbols scheduled for the physical data channel may be any one of 1, 2, 4, 7, and 14. In more detail, 5 bits may be mapped as shown in Table 7 according to the first OFDM symbol scheduled for the physical data channel and the number of OFDM symbols scheduled for the physical data channel.

[0292] [Table 7]

[0293] state Starting symbol index length state Starting symbol index length 0 0 2 16 0 1 1 2 2 17 1 1 2 4 2 18 2 1 3 6 2 19 3 1 4 8 2 20 4 1 5 10 2 21 5 1 6 12 2 22 6 1 7 0 4 23 7 1 8 2 4 24 8 1 9 4 4 25 9 1 10 6 4 26 10 1 11 8 4 27 11 1 12 10 4 28 12 1 13 0 7 29 13 1 14 7 7 30 - - 15 0 14 31 - -

[0294] 0: {0, 1}, 1: {2, 3}, 2: {4, 5}, 3: {6, 7}, 4: {8, 9}, 5: {10, 11}, 6: {12, 13}, 7: {0, 1, 2, 3}, 8: {2, 3, 4, 5}, 9: {4, 5, 6, 7}, 10: {6, 7, 8, 9}, 11: {8, 9, 10, 11}, 12: {10, 11, 12, 13}, 13: {0, 1, 2, 3, 4, 5, 6}, 14 : {7, 8, 9, 10, 11, 12, 13}, 15: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}, 16: {0}, 17: {1}, 18: {2}, 19: {3}, 20: {4}, 21: {5}, 22: {6}, 23: {7}, 24: {8}, 25: {9}, 26: {10}, 27: {11}, 28: {12}, 29: {13}. In this case, in X: {Y}, X represents a state value, and Y represents an OFDM symbol indicated by the X state. In addition, state values ​​30 and 31 may be reserved. State values ​​30 and 31 may represent all semi-statically configured DL symbols and semi-statically configured unknown symbols, respectively. In this case, the unknown symbol may indicate a symbol that is not configured as a UL symbol or a DL symbol. In addition, among all semi-statically configured DL symbols and all semi-statically configured unknown symbols, state values ​​30 and 31 may respectively represent all OFDM symbols except a specified number of OFDM symbols at the end of the time slot. In such a case, the specified number may be a fixed number. For example, the specified number may be 1. In addition, the specified number may be specified for each UE, respectively. Specifically, the specified number may be configured for each UE through an RRC signal.

[0295] In another specific embodiment, 1 bit of the 6 bits may indicate the reference position of the time slot in which the physical data channel is transmitted. In this case, 1 bit may indicate whether the reference position of the time slot in which the physical data channel is transmitted is the first OFDM symbol of the time slot or the OFDM symbol immediately after the CORESET. 5 bits of the 6 bits may be the number of OFDM symbols scheduled for the physical data channel. If 1 bit of the 6 bits indicates the starting time point of the time slot, and the index of the OFDM start symbol indicated by 5 bits of the 6 bits is A, the physical data channel is transmitted in the OFDM symbol corresponding to the number of OFDM symbols in which the physical data channel is transmitted. If 1 bit of the 6 bits indicates the OFDM symbol immediately after the CORESET, and the index of the OFDM start symbol indicated by 5 bits of the 6 bits is A, the physical data channel is transmitted in the OFDM symbol corresponding to the number of OFDM symbols in which the physical data channel is transmitted starting from A+B. In this case, B is the index of the OFDM symbol corresponding to the OFDM symbol immediately following CORESET.

[0296] Figure 29 to Figure 33 An OFDM symbol corresponding to a physical data channel scheduled for a UE indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention is illustrated.

[0297] According to a specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE can indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1, 2 states in which the number of OFDM symbols scheduled for the physical data channel is 7, and 28 states in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2. In this case, the state in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2 can follow the RIV scheme in which 14 OFDM symbols are bundled and indicated. According to a specific embodiment, the OFDM symbol that can be represented by 6 bits can be related to Fig.29 The same as in.

[0298] According to another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE can indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1, 8 states in which the number of OFDM symbols scheduled for the physical data channel is 7, and 28 states in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2. In this case, the state in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2 indicates that the state starts with an even OFDM symbol index. According to a specific embodiment, the OFDM symbol that can be represented by 6 bits can be the same as Fig.30 The same as in.

[0299] According to another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE can indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1 and 49 states in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2. In this case, 28 states of the 49 states in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2 indicate starting from an even OFDM symbol index, and 21 states indicate starting from an odd OFDM symbol index. According to a specific embodiment, the OFDM symbol that can be represented by 6 bits can be the same as Fig.31 The same as in.

[0300] According to another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE can indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1 and 48 states in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2. In this case, 28 states out of the 48 states in which the number of OFDM symbols scheduled for the physical data channel is a multiple of 2 can indicate starting from an even OFDM symbol index, and 20 states can indicate starting from an odd OFDM symbol index. According to a specific embodiment, the OFDM symbol that can be represented by 6 bits can be the same as Fig.32 The same as in.

[0301] In another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE can indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1, 8 states in which the number of OFDM symbols scheduled for the physical data channel is 7, 13 states in which the number of OFDM symbols scheduled for the physical data channel is 2, 11 states in which the number of OFDM symbols scheduled for the physical data channel is 4, one state in which the number of OFDM symbols scheduled for the physical data channel is 14, 4 states in which the number of OFDM symbols scheduled for the physical data channel is 3, and 13 states in which the number of OFDM symbols scheduled for the physical data channel is 2. The OFDM symbols scheduled for the physical data channel are 2 states in which the number of OFDM symbols scheduled for the physical data channel is 5, 2 states in which the number of OFDM symbols scheduled for the physical data channel is 6, one state in which the number of OFDM symbols scheduled for the physical data channel is 8, one state in which the number of OFDM symbols scheduled for the physical data channel is 9, one state in which the number of OFDM symbols scheduled for the physical data channel is 10, one state in which the number of OFDM symbols scheduled for the physical data channel is 11, one state in which the number of OFDM symbols scheduled for the physical data channel is 12, and one state in which the number of OFDM symbols scheduled for the physical data channel is 13. In this case, all states in which the number of OFDM symbols scheduled for the physical data channel is 3 may start from an OFDM symbol index corresponding to a multiple of 3. According to a specific embodiment, an OFDM symbol that can be represented by 6 bits may be represented by an OFDM symbol index corresponding to a multiple of 3. Fig.33 The same as in.

[0302] According to another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE may indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1, 8 states in which the number of OFDM symbols scheduled for the physical data channel is 7, 13 states in which the number of OFDM symbols scheduled for the physical data channel is 2, 11 states in which the number of OFDM symbols scheduled for the physical data channel is 4, 1 state in which the number of OFDM symbols scheduled for the physical data channel is 14, 10 states in which the number of OFDM symbols scheduled for the physical data channel is 5, and 7 states in which the number of OFDM symbols scheduled for the physical data channel is 8. In this case, the state indication in which the number of OFDM symbols scheduled for the physical data channel is 1 starts from all possible OFDM symbol indexes.

[0303] According to another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE may indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1, 8 states in which the number of OFDM symbols scheduled for the physical data channel is 7, 13 states in which the number of OFDM symbols scheduled for the physical data channel is 2, 11 states in which the number of OFDM symbols scheduled for the physical data channel is 4, 1 state in which the number of OFDM symbols scheduled for the physical data channel is 14, 12 states in which the number of OFDM symbols scheduled for the physical data channel is 3, and 5 states in which the number of OFDM symbols scheduled for the physical data channel is 10. In this case, the state indication in which the number of OFDM symbols scheduled for the physical data channel is 1 starts from all possible OFDM symbol indices.

[0304] According to another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled for the UE may indicate: 14 states in which the number of OFDM symbols scheduled for the physical data channel is 1, 8 states in which the number of OFDM symbols scheduled for the physical data channel is 7, 13 states in which the number of OFDM symbols scheduled for the physical data channel is 2, 11 states in which the number of OFDM symbols scheduled for the physical data channel is 4, 1 state in which the number of OFDM symbols scheduled for the physical data channel is 14, 9 states in which the number of OFDM symbols scheduled for the physical data channel is 6, 6 states in which the number of OFDM symbols scheduled for the physical data channel is 9, and 2 states in which the number of OFDM symbols scheduled for the physical data channel is 11. In this case, the state indication in which the number of OFDM symbols scheduled for the physical data channel is 1 starts from all possible OFDM symbol indexes.

[0305] In the above, a method of using RIV to represent time-frequency resources scheduled for UE has been described. The base station can use RIV to indicate continuous resources in the time domain scheduled for the UE. In this case, the base station can use the index of the reference OFDM symbol to indicate to the UE the position of the starting symbol of the scheduled continuous resources. The index of the starting OFDM symbol indicated by RIV is obtained by subtracting the index of the reference OFDM symbol from the starting OFDM symbol of the time-frequency resources scheduled for the UE. In more detail, the base station can use RRC signaling to signal the index of the reference OFDM symbol. In addition, the base station can determine the RIV value according to the following equation.

[0306] if but

[0307] RIV=N symbols (Lsymbols -1)+S start '

[0308] otherwise

[0309] RIV=N symbols (N symbols -L symbols +1)+(N symbols -1-S start ′)

[0310] Where L symbols ≥1 and will not exceed N symbols -S start ′.

[0311] L symbols represents the number of OFDM symbols of the time resources scheduled for the UE. start is the index of the starting OFDM symbol of the time resource scheduled for the UE obtained based on the index of the reference OFDM symbol. Therefore, the starting OFDM symbol index of the time resource scheduled for the UE can be obtained according to the following equation.

[0312] S start =S start '+R

[0313] In this case, R is the index of the reference OFDM symbol. When the reference OFDM symbol is used in this way, the memory size that the UE has to prepare for data channel reception can be reduced. In addition, these embodiments can reduce the number of bits used to send the field of RIV.

[0314] It has been described above that the base station can configure the index of the reference OFDM symbol by using an RRC signal. In another specific embodiment, the UE may assume the index of the reference OFDM symbol to be the first OFDM symbol of the time slot. In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the DCI sent by the physical data channel of the scheduled UE to the CORESET. For example, the UE may determine the first OFDM symbol index of the CORESET to which the DCI received by the physical data channel of the scheduled UE is sent as the index of the reference OFDM symbol. In another specific embodiment, the UE may determine the index of the OFDM symbol immediately after the last OFDM symbol of the CORESET in which the DCI of the time resource scheduled by the UE is sent as the index of the reference OFDM symbol. When the index of the first OFDM symbol of the CORESET in which the DCI received by the physical data channel of the UE is scheduled for the UE is K, and the number of OFDM symbols corresponding to the time resources occupied by the CORESET is A, the index of the reference OFDM symbol may be referred to as K+A. Compared with signaling the index of the reference OFDM symbol through the RRC signal, the number of bits required for RRC signal transmission can be reduced.

[0315] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the CORESET transmitted by the DCI received by the physical data channel scheduling the UE and the above-mentioned K0 value. K0 represents the time slot in which the PDSCH is scheduled. If K0=0, it indicates that the time slot in which the DCI received by the physical data channel scheduling the UE and the corresponding physical data channel are transmitted are the same as each other. In addition, when K0=1, it indicates that the corresponding physical data channel is transmitted to the UE in the time slot immediately after the time slot in which the DCI received by the physical data channel scheduling the UE is transmitted. In a specific embodiment, if K0 is greater than 0, the UE may determine that the index of the reference OFDM symbol is 0. In addition, if K0 is equal to 0, the UE may determine the index of the reference OFDM symbol as the first OFDM symbol of the CORESET in which the DCI received by the physical data channel scheduling the UE is transmitted. In another specific embodiment, if K0 is equal to 0, the UE may determine the index of the reference OFDM symbol as a value obtained by adding the number of OFDM symbols corresponding to the time resource occupied by the CORESET to the index of the first OFDM symbol of the CORESET to which the DCI received by the physical data channel of the scheduling UE is transmitted. In such an embodiment, the UE may perform different operations when cross scheduling is performed or not performed, thereby reducing the number of bits required for RIV transmission. In addition, the number of bits required for RRC signal transmission may be reduced compared to when the index of the reference OFDM symbol is signaled through the RRC signal.

[0316] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the mapping type of the physical data channel received by the UE. In this case, the mapping type of the physical data channel may indicate whether the position of the demodulation reference signal (DMRS) is determined independently of the position of the physical data channel. In addition, the physical channel received by the UE may be a PDSCH. In more detail, the mapping type of the physical data channel may be classified into type A and type B. Type A may indicate that the position of the DMRS is fixed at OFDM symbol index 2 or 3 in the time slot. In this case, the position of the DMRS may be indicated by a physical broadcast channel (PBCH). In addition, type B may indicate that the first DMRS is located in the first OFDM symbol of the physical data channel. When the mapping type of the physical data channel is type A, the UE may determine that the index of the reference OFDM symbol is 0. In addition, when the mapping type of the physical data channel is type B, the UE may determine the index of the reference OFDM symbol as the index of the first OFDM symbol of the CORESET in which the DCI received by the physical data channel of the scheduling UE is transmitted. In another specific embodiment, when the mapping type of the physical data channel is type B, the UE may determine the index of the reference OFDM symbol as a value obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the corresponding CORESET to the index of the first OFDM symbol of the CORESET to which the DCI received by the physical data channel of the scheduling UE is sent.

[0317] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the position of the DCI received by the physical data channel of the scheduling UE. In more detail, when the DCI received by the physical data channel of the scheduling UE is located before the predetermined OFDM symbol, the UE may determine the index of the reference OFDM symbol to be 0. In addition, when the DCI received by the physical data channel of the scheduling UE is located before the predetermined OFDM symbol, the UE may determine the index of the reference OFDM symbol as the index of the first OFDM symbol of the CORESET in which the DCI of the physical data channel of the scheduling UE is transmitted. In another specific embodiment, when the DCI received by the physical data channel of the scheduling UE is located before the predetermined OFDM symbol, the UE may determine the index of the reference OFDM symbol as the sum obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the corresponding CORESET to the index of the first OFDM symbol of the CORESET to which the DCI received by the physical data channel of the scheduling UE is transmitted. When the mapping type of the physical data channel received by the UE configured by the PBCH is type A, the position of the predetermined OFDM symbol may be the same as the position of the DMRS. In more detail, when the mapping type of the physical data channel is type A and the PBCH indicates the second OFDM symbol by the position of the DMRS, the position of the predetermined OFDM symbol may be the second OFDM symbol. In addition, when the mapping type of the physical data channel is type A and the PBCH indicates the third OFDM symbol by the position of the DMRS, the position of the predetermined OFDM symbol may be the third OFDM symbol.

[0318] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the CORESET in which the DCI received by the physical data channel of the scheduled UE is transmitted, the above-mentioned K0 value, and whether the DCI received by the physical data channel of the scheduled UE is located before the predetermined OFDM symbol. K0 represents the time slot in which the PDSCH is scheduled. In a specific embodiment, when K0 is greater than 0 or the DCI received by the physical data channel of the scheduled UE is located before the predetermined OFDM symbol, the UE may determine that the index of the reference OFDM symbol is 0. In addition, when K0 is equal to 0 or the DCI received by the physical data channel of the scheduled UE is not located before the predetermined OFDM symbol, the UE may determine the index of the reference OFDM symbol as the first OFDM symbol of the CORESET in which the DCI received by the physical data channel of the scheduled UE is transmitted. In another specific embodiment, when K0 is equal to 0 and the DCI received by the physical data channel of the scheduling UE is not located before the predetermined OFDM symbol, the UE may determine the index of the reference OFDM symbol as the sum obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the CORESET and the index of the first OFDM symbol of the CORESET in which the DCI received by the physical data channel of the scheduling UE is transmitted. In such an embodiment, the UE may perform different operations when cross scheduling is performed or not performed, thereby reducing the number of bits required for RIV transmission. In addition, the number of bits required for RRC signal transmission may be reduced compared to when the index of the reference OFDM symbol is signaled through the RRC signal.

[0319] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the CORESET monitored by the UE. Specifically, when multiple CORESETs monitored by the UE are configured in one time slot, the UE may determine the index of the reference OFDM symbol as the earliest OFDM symbol among the OFDM symbols occupied by the multiple CORESETs. This is because it may be difficult for the UE to determine through which CORESET of the multiple CORESETs the base station transmits the physical control channel. According to this embodiment, the UE may receive the physical data channel even if the physical control channel is transmitted to any one of the multiple CORESETs.

[0320] In another specific embodiment, when the CORESET in which the DCI for physical data channel reception of the scheduling UE is transmitted is located in a time slot different from the time slot in which the corresponding physical data channel is transmitted, the UE may determine the index of the reference OFDM symbol to be 0. In addition, when the CORESET in which the DCI for physical data channel reception of the scheduling UE is transmitted is located in the same time slot as the time slot in which the corresponding physical data channel is transmitted, the UE may determine the index of the reference OFDM symbol to be the first OFDM symbol of the CORESET in which the DCI for physical data channel reception of the scheduling UE is transmitted. According to another specific embodiment, when the CORESET in which the DCI for physical data channel reception of the scheduling UE is transmitted is located in the same time slot as the time slot in which the corresponding physical data channel is transmitted, the UE may determine the index of the reference OFDM symbol to be a value obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the CORESET to the index of the first OFDM symbol of the CORESET in which the DCI for physical data channel reception of the scheduling UE is transmitted.

[0321] In addition, when the DCI schedules the reception of the physical data channel of the UE, the UE may not expect that the first OFDM symbol and the last OFDM symbol of the time-frequency resource in which the physical data channel reception of the UE is scheduled are located in different time slots. Specifically, the UE may determine the last OFDM symbol of the time-frequency resource in which the reception of the physical data channel of the UE is scheduled as the last OFDM symbol of the time slot in which the starting OFDM symbol of the time-frequency resource scheduled for the physical data channel reception of the UE is located or the symbol before the last OFDM symbol. For example, the number of OFDM symbols included in the time slot may be 14, and the DCI may indicate the first OFDM symbol of the time-frequency resource in which the physical data channel reception of the UE is scheduled as the seventh OFDM symbol. In this case, when the number of OFDM symbols occupied by the time-frequency resource scheduled for the physical data channel reception of the UE indicated by the DCI is 7, the UE may determine the OFDM symbol scheduled for the physical data channel reception of the UE as the seventh OFDM symbol to the fourteenth OFDM symbol. In the above embodiment, the physical data channel received by the UE may be a PDSCH.

[0322] The embodiment in which the base station indicates the position of the starting symbol of the continuous resources scheduled for the UE using the index of the reference OFDM symbol can also be applied to the case in which the base station schedules the physical channel transmission of the UE. In more detail, the UE can determine the index of the reference OFDM symbol as the first OFDM symbol of the time slot. The OFDM symbol mentioned about the physical channel transmission of the UE can be a DFT-S-OFDM symbol.

[0323] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the mapping type of the physical data channel sent by the UE. In this case, the mapping type of the physical data channel sent by the UE may indicate whether the position of the DMRS is determined independently of the position of the physical data channel. In addition, the physical channel sent by the UE may be a PUSCH. In addition, the mapping type of the physical data channel sent by the UE may be configured by UL-DMRS-config-type sent by the RRC signal. In more detail, the mapping type of the physical data channel may be classified into type A and type B. Type A may indicate that the position of the first DMRS is fixed in the time slot. In addition, type B may indicate that the first DMRS is located in the first OFDM symbol of the physical data channel. When the mapping type of the physical data channel is type A, the UE may determine the index of the reference OFDM symbol as the index of the first OFDM symbol corresponding to the physical data channel. When the mapping type of the physical data channel is type B, the UE may determine that the index of the reference OFDM symbol is 0.

[0324] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on the mapping type and UL transmission waveform of the physical data channel sent by the UE. The UE may perform UL transmission using any one of CP-OFDM and DFT-S-OFDM. The base station may use an RRC signal to configure whether the UE uses one of CP-OFDM and DFT-S-OFDM. When the mapping type of the physical data channel is type B, the UE may determine that the index of the reference OFDM symbol is 0. If the mapping type of the physical data channel is type A and the UE is configured to use a DFT-S-OFDM waveform, the UE may determine the index of the reference OFDM symbol to be the index of the OFDM symbol next to the OFDM symbol in which the first DMRS is located. This is because the DFT-S-OFDM symbol used as the UL DMRS may not be used for physical data channel UL transmission. In addition, if the mapping type of the physical data channel is type A and the UE is configured to use a CP-OFDM waveform, the UE may determine the index of the reference OFDM symbol to be the index of the OFDM symbol in which the first DMRS is located.

[0325] In another specific embodiment, the UE may determine the index of the reference OFDM symbol based on a semi-statically configured symbol configuration. In more detail, the UE may determine the index of the reference OFDM symbol as the index of the unknown symbol immediately following the DL symbol in the time slot in which the physical data channel of the UE is scheduled. In another specific embodiment, the UE may determine the index of the reference OFDM symbol as a value obtained by adding the number of GAP symbols to the index of the unknown symbol immediately following the DL symbol in the time slot in which the physical data channel of the UE is scheduled. The number of GAP symbols may be determined based on a timing advance (TA) value and an OFDM symbol length. In another specific embodiment, the number of GAP symbols may be configured by a base station. In addition, when a DL data channel is scheduled for an unknown symbol, the UE may treat the unknown symbol as a DL symbol. In addition, when a UL data channel is scheduled for an unknown symbol, the UE may treat the unknown symbol as a UL symbol.

[0326] In addition, when the DCI schedules the transmission of the physical data channel of the UE, the UE may not expect the first OFDM symbol and the last OFDM symbol of the time-frequency resource in which the physical data channel transmission of the UE is scheduled to be located in different time slots. Specifically, the UE may determine the last OFDM symbol of the time-frequency resource in which the transmission of the physical data channel of the UE is scheduled as the last OFDM symbol of the time slot in which the starting OFDM symbol of the time-frequency resource scheduled for the transmission of the physical data channel of the UE is located or the symbol before the last OFDM symbol. For example, the number of OFDM symbols included in the time slot may be 14 and the DCI may indicate the first OFDM symbol of the time-frequency resource in which the physical data channel transmission of the UE is scheduled as the seventh OFDM symbol. In this case, when the number of OFDM symbols occupied by the time-frequency resource scheduled for the physical data channel transmission of the UE indicated by the DCI is 7, the UE may determine the OFDM symbol scheduled for the physical data channel transmission of the UE as the seventh OFDM symbol to the fourteenth OFDM symbol. In the above embodiment, the physical data channel sent by the UE may be a PUSCH.

[0327] In the above embodiments, the physical data channel may include PDSCH or PUSCH. In addition, the physical control channel may include PDCCH or PUCCH. In addition, in the embodiments described using PUSCH, PDCCH, PUCCH and PDCCH, other types of data channels and control channels may be applied.

[0328] The method and system of the present disclosure are described with respect to specific embodiments, and a computer system having a general hardware architecture may be used to implement configuration elements, part, or all operations of the present disclosure.

[0329] The foregoing description of the present disclosure has been given for the purpose of illustration and description. It is obvious to those of ordinary skill in the art to which the present disclosure relates that the present disclosure can be easily modified into other detailed forms without changing the technical principles or basic features of the present disclosure. Therefore, these embodiments as described above are proposed only for illustrative purposes and do not limit the present disclosure. For example, each component described as a single type can be implemented in a distributed manner. Similarly, components described as distributed can be implemented in a combined manner.

[0330] The scope of the present disclosure is set forth by the appended claims rather than the foregoing description. It should be understood that all changes or modifications derived from the definition and scope of the claims and their equivalents fall within the scope of the present disclosure.

Claims

1. A terminal of a wireless communication system, the terminal comprising: Communication module; and a processor configured to control the communication module, Wherein, the processor is configured to: receiving a radio resource control (RRC) signal from a base station of the wireless communication system through the communication module, determining a first time-frequency resource corresponding to at least one resource set indicated by the RRC signal, wherein each of the at least one resource set is identified by at least one index, receiving a physical control channel from the base station through the communication module, wherein the physical control channel schedules a physical data channel in a plurality of time slots, determining a second time-frequency resource in which the physical data channel of the terminal is scheduled to be received by the physical control channel, wherein the first time-frequency resource overlaps with the second time-frequency resource in at least one overlapping time-frequency resource, wherein the at least one overlapping time-frequency resource includes a plurality of sub-resource sets, obtaining a rate matching indicator from the physical control channel, wherein the rate matching indicator comprises a plurality of bits, wherein each of the plurality of bits indicates whether reception of the physical data channel in each of the plurality of sub-resource sets is unavailable, wherein a bit in the plurality of bits indicating whether reception of the physical data channel in one of the plurality of sub-resource sets is unavailable is determined based on an index of a particular resource set comprising the sub-resource set in the plurality of sub-resource sets, and receiving the physical data channel according to the rate matching indicator, The resource set is a collection of time-frequency resources.

2. The terminal according to claim 1, wherein: In the case where no distinction is made in the time domain, each of the plurality of sub-resource sets is divided based on the frequency domain among the overlapping time-frequency resources.

3. The terminal according to claim 1, wherein: When the second time-frequency resources do not overlap with all of the at least one resource set, the processor is configured to receive the physical data channel in the second time-frequency resources regardless of the rate matching indicator.

4. The terminal according to claim 1, wherein: receiving the physical control channel in a first time slot, wherein, when the second time-frequency resource overlaps with the at least one resource set in a second time slot in which the physical data channel is received, the processor is configured to perform rate matching to receive the physical data channel in time-frequency resources other than time-frequency resources in which the at least one resource set overlaps with the time-frequency resources in which the physical data channel is scheduled in the second time slot, The first time slot and the second time slot are different from each other.

5. A method for operating a terminal of a wireless communication system, the method comprising: receiving a radio resource control (RRC) signal from a base station of the wireless communication system; determining a first time-frequency resource corresponding to at least one resource set indicated by the RRC signal, wherein each of the at least one resource set is identified by at least one index; receiving a physical control channel from the base station, wherein the physical control channel schedules a physical data channel in a plurality of time slots; Determine a second time-frequency resource in which the physical data channel of the terminal is scheduled to be received by the physical control channel, wherein the first time-frequency resource overlaps with the second time-frequency resource in at least one overlapping time-frequency resource, wherein the at least one overlapping time-frequency resource includes a plurality of sub-resource sets; obtaining a rate matching indicator from the physical control channel, wherein the rate matching indicator comprises a plurality of bits, wherein each of the plurality of bits indicates whether reception of the physical data channel in each of the plurality of sub-resource sets is unavailable, wherein a bit in the plurality of bits indicating whether reception of the physical data channel in one of the plurality of sub-resource sets is unavailable is determined based on an index of a particular resource set comprising the sub-resource set in the plurality of sub-resource sets; and receiving the physical data channel according to the rate matching indicator, The resource set is a collection of time-frequency resources.

6. The operating method according to claim 5, wherein: In the case where no distinction is made in the time domain, each of the plurality of sub-resource sets is divided based on the frequency domain among the overlapping time-frequency resources.

7. The operating method according to claim 5, wherein: The receiving the physical data channel includes receiving the physical data channel in the second time-frequency resources when the second time-frequency resources do not overlap with all of the at least one resource set, regardless of the rate matching indicator.

8. The operating method according to claim 5, wherein: receiving the physical control channel in a first time slot, wherein receiving the physical data channel comprises, when the second time-frequency resource overlaps with the at least one resource set in a second time slot in which the physical data channel is received, performing rate matching to receive the physical data channel in time-frequency resources other than time-frequency resources in which the at least one resource set overlaps with the time-frequency resources in which the physical data channel is scheduled in the second time slot, The first time slot and the second time slot are different from each other.

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