Method for receiving physical control channel in wireless communication system and apparatus using same

Abstract

A method for receiving a physical control channel in a wireless communication system and an apparatus using the same are provided. Each base station for wireless communication comprises: a communication module; and a processor. The processor is configured to determine a number of dynamic slot format information (SFI) bits based on a maximum value of a slot format combination index that can be indicated by the dynamic SFI transmitted to the terminal, and monitor a physical downlink control channel (PDCCH) including the dynamic SFI based on the number of dynamic SFI bits. The slot format combination index identifies a slot format combination configured for the terminal. The slot format combination indicates a type of a symbol included in the one or more slots, and the type of the symbol is one of a downlink symbol, an uplink symbol, and a flexible symbol.

Description

[0001] This application is a divisional application of a patent application with application number 201980052821.0 (PCT / KR2019 / 010604), which was submitted to the China Patent Office on February 8, 2021, with an international application date of August 20, 2019, and the invention name is "Method for receiving a physical control channel in a wireless communication system and a device using the same". Technical Field

[0002] The present disclosure relates to a wireless communication system and more particularly to a method for receiving a physical control channel in a wireless communication system and a device using the method. Background Art

[0003] After the commercialization of the fourth generation (4G) communication system, in order to meet the increasing demand for wireless data services, efforts are being made to develop a new fifth generation (5G) communication system. The 5G communication system is referred to as an ultra-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 in a millimeter wave (mmWave) band of 6 GHz or higher, and includes a communication system operating in a band of 6 GHz or lower in terms of ensuring coverage, so that the implementation in the base station and the terminal is under consideration.

[0004] The 3rd Generation Partnership Project (3GPP) NR system improves the spectrum efficiency of the network and enables communication providers to provide more data and voice services over a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to supporting a large amount of voice. 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 low operating costs due to 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 reduce the path loss of radio waves and increase the transmission distance of radio waves in the mmWave band, in the 5G communication system, beamforming, massive multiple input / output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming combining analog beamforming and digital beamforming, and massive antenna technology are discussed. In addition, for the network improvement of the system, in the 5G communication system, technology development related to evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), mobile networks, cooperative communication, coordinated multipoint (CoMP), interference cancellation, etc. is being carried out. 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 being developed.

[0007] Meanwhile, in a human-centered connection network where humans 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 emerging. In order to realize IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are required, so that in recent years, technologies such as sensor networks, machine-to-machine (M2M) and machine type communication (MTC) have been studied to connect between objects. In the IoT environment, it is possible to provide intelligent Internet technology (IT) services that collect and analyze data generated from connected objects to create new value in human life. Through the integration and mixing of existing information technology (IT) and various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart home 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. The application of cloud RAN, which is the above-mentioned big data processing technology, is an example of the fusion of 5G technology and IoT technology. In general, mobile communication systems are developed to provide voice services while ensuring the activities of users.

[0009] However, mobile communication systems are gradually expanding not only voice services 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 receiving a physical control channel in a wireless communication system.

[0012] Technical Solution

[0013] A user equipment in 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: determine the number of dynamic SFI bits based on the maximum value of the slot format combination index that can be indicated by the dynamic slot format information (SFI) sent to the user equipment, and monitor the physical downlink control channel (PDCCH) including the dynamic SFI based on the number of dynamic SFI bits. The slot format combination index indicated by the dynamic SFI sent to the user equipment identifies the slot format combination configured for the user equipment. The slot format combination indicates the type of symbol included in one or more slots, and the type of symbol is any one of a downlink symbol, an uplink symbol, and a flexible symbol.

[0014] The processor may be configured to determine the number of dynamic SFI bits to be 1 when the maximum value is 0.

[0015] The processor can be configured to 2 (maxSFIindex+1)) determines the number of dynamic SFI bits. max(a, b) represents the larger value of "a" and "b", and maxSFIindex represents the maximum value.

[0016] The processor may be configured to: when the user equipment receives the dynamic SFI, determine a time slot format combination configured for the user equipment based on a value of the dynamic SFI, and may perform transmission or reception based on the determined time slot format combination.

[0017] The processor may be configured to, when the maximum value is 0 and the value of the dynamic SFI received by the user equipment is 1, perform an operation corresponding to a case where the PDCCH including the dynamic SFI has failed to be received.

[0018] The processor may be configured to, when the maximum value is 0 and the value of the dynamic SFI received by the user equipment is 1, cancel transmission and reception of a measurement signal configured by a semi-static radio resource control (RRC).

[0019] The processor may be configured to not expect the dynamic SFI value to be 1 when the maximum value is 0.

[0020] A method for operating a user equipment in a wireless communication system according to an embodiment of the present invention includes: determining the number of dynamic SFI bits based on a maximum value of a slot format combination index that can be indicated by a dynamic SFI sent to the user equipment, and monitoring a PDCCH including a dynamic SFI based on the number of dynamic SFI bits. The slot format combination index indicated by the dynamic SFI sent to the user equipment identifies the slot format combination configured for the user equipment. The slot format combination indicates the type of symbol included in one or more slots, and the type of symbol is any one of a downlink symbol, an uplink symbol, and a flexible symbol.

[0021] Determining the number of dynamic SFI bits may include: when the maximum value is 0, determining the number of dynamic SFI bits to be 1.

[0022] Determining the number of dynamic SFI bits to be 1 may include: determining the number of dynamic SFI bits to be 1 according to max(ceil(log 2 (maxSFIindex+1)) determines the number of dynamic SFI bits. max(a, b) represents the larger value of "a" and "b", and maxSFIindex represents the maximum value.

[0023] The operation method may further include: when the user equipment receives the dynamic SFI, determining a time slot format combination configured for the user equipment based on a value of the dynamic SFI, and performing transmission or reception based on the determined time slot format combination.

[0024] The operation method may further include: when the maximum value is 0 and the value of the dynamic SFI is 1, performing an operation corresponding to a case where the PDCCH including the dynamic SFI fails to be received.

[0025] The operating method may further include: when the maximum value is 0 and the value of the dynamic SFI is 1, canceling transmission and reception of a measurement signal configured by a semi-static radio resource control (RRC).

[0026] The operating method may further include: when the maximum value is 0, the value of the undesired dynamic SFI is 1.

[0027] Beneficial Effects

[0028] Embodiments of the present invention provide a method for efficiently receiving a physical control channel in a wireless communication system and a device using the method.

[0029] 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

[0030] Figure 1 An example of a radio frame structure used in a wireless communication system is illustrated.

[0031] Figure 2 An example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system is illustrated.

[0032] Figure 3 A diagram for explaining physical channels used in a 3GPP system and a typical signal transmission method using the physical channels.

[0033] Figure 4 Illustration of SS / PBCH blocks used for initial cell access in a 3GPP NR system.

[0034] Figure 5 Illustration of a procedure for transmitting control information and control channels in a 3GPP NR system.

[0035] Figure 6 Illustration of a control resource set (CORESET) in which a physical downlink control channel (PUCCH) can be transmitted in a 3GPP NR system.

[0036] Figure 7 A method for configuring a PDCCH search space in a 3GPP NR system is illustrated.

[0037] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0038] Fig. 9 It is a diagram for explaining signal carrier communication and multi-carrier communication.

[0039] Fig.10 is a diagram showing an example in which a cross-carrier scheduling technology is applied.

[0040] Fig.11 is a block diagram showing the configuration of a UE and a base station according to an embodiment of the present invention.

[0041] Fig.12 The format of the slot format combination indicator according to an embodiment of the present invention is shown.

[0042] Fig.13The operation of the user equipment according to the embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] The terms used in the specification adopt the currently widely used general terms as much 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 certain 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 disclose that the terms used in the specification should not be analyzed based only on the names of the terms, but should be analyzed based on the substantial meanings of the terms and contents in the entire specification.

[0044] Throughout the specification and the claims that follow, when it is described that an element is "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 elements without implying the exclusion of any other elements. Furthermore, in some exemplary embodiments, limitations such as "greater than or equal to" or "less than or equal to" based on a specific threshold value may be appropriately replaced with "greater than" or "less than", respectively.

[0045] The following technologies can be used in various wireless access systems: such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier-FDMA (SC-FDMA), etc. CDMA can be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by wireless technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, 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 Evolved UMTS (E-UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA), and LTE Advanced (A) is an evolved version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A, and is a system for supporting enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine type communication (mMTC) services as requirements of IMT-2020. For the sake of clear description, 3GPP NR is mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0046] 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, in order to help understand the description, each embodiment describes 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 by 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.

[0047] Figure 1 An example of a radio frame structure used in a wireless communication system is illustrated.

[0048] refer to Figure 1 , the radio frame (or radio frame) used in the 3GPP NR system may have a 10ms (Δf max N f / 100)*T c ) length. In addition, the wireless frame includes 10 subframes (SF) of equal size. Here, Δf max =480*10 3 Hz,Nf =4096,T c =1 / (Δf ref *N f,ref ), Δf ref =15*10 3 Hz, and N f,ref =2048. Numbers from 0 to 9 can be assigned to 10 subframes in one radio frame respectively. 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 configuration. That is, 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz can be used for subcarrier spacing. One subframe with a length of 1ms may include 2 μ time slots. In this case, the length of each time slot is 2 -μ ms. It can be from 0 to 2 μ -1 are assigned to the 2 μ In addition, the time slots from 0 to 10*2 μ Numbers of -1 are respectively allocated to time slots in a radio frame. 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).

[0049] 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.

[0050] 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. An OFDM symbol also refers to a symbol interval. Unless otherwise specified, an OFDM symbol may be referred to as a symbol. An RB includes 12 consecutive subcarriers in the frequency domain. Reference Figure 2 , the signal transmitted from each time slot can be composed of N size,μ grid,x *N RB sc subcarriers and N slot symb Here, when the signal is a DL signal, x=DL, and when the signal is a UL signal, x=UL. N size,μ grid,xrepresents the number of resource blocks (RBs) according to the subcarrier spacing component μ (x is DL or UL), and N slot symb N represents the number of OFDM symbols in a time slot. RB sc is the number of subcarriers constituting one RB and N RB sc = 12. The OFDM symbol may be called a cyclic shift OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol according to a multiple access scheme.

[0051] 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 at a 60kHz subcarrier spacing. Figure 2 In the embodiment, for the convenience of description, one time slot is configured with 14 OFDM symbols as an example, but the embodiments of the present disclosure can be applied to time slots with different numbers of OFDM symbols in a similar manner. 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 transmission of reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0052] An RB can be composed of N RB sc For reference, a resource configured with one OFDM symbol and one subcarrier may be referred to as a resource element (RE) or tone. Thus, one RB can be configured with N slot symb *N RB sc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) in 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 is the assigned index, and l can be from 0 to N in the time domain slot symb –1 The assigned index.

[0053] 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 is able to determine the time and frequency parameters necessary to demodulate the DL signal and send the UL signal at the correct time.

[0054] 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 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, and 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 unavailable. In a UL symbol, UL transmission is possible, but DL transmission is unavailable. A flexible symbol may be determined to be used as DL or UL according to a signal.

[0055] Information about the type of each symbol, i.e., information indicating any one of a DL symbol, a UL symbol, and a flexible symbol, may be configured using a cell-specific or common radio resource control (RRC) signal. In addition, information about the type of each symbol may be additionally configured using 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 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 from the end of the period of the cell-specific time slot configuration, and v) the number of UL symbols from the last symbol of the time slot immediately preceding the time slot having only UL symbols. Here, a symbol that is not configured with any one of the UL symbol and the DL symbol is a flexible symbol.

[0056] When the 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 with a 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 corresponding time slot N slot symbThe number of UL symbols among the symbols. In this case, the DL symbols of the time slot can be continuously configured as the first symbol to the i-th symbol of the time slot. In addition, the UL symbols of the time slot can be continuously configured as 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 symbols and DL symbols is a flexible symbol.

[0057] Figure 3 It is a diagram for explaining the physical channels used in a 3GPP system (e.g., NR) and a typical signal transmission method using the physical channels.

[0058] If the power of the UE is turned on or the UE camps on a new cell, the UE performs initial cell search (S101). Specifically, the UE can synchronize with the BS during the initial cell search. To this end, the UE can receive the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as the cell ID. Thereafter, the UE can receive the physical broadcast channel from the base station and obtain the broadcast information in the cell.

[0059] After the initial cell search is completed, the UE receives the 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 the cell common system information for the normal operation of the UE in the physical layer of the radio resource control (RRC), and is called the remaining system information, or is called the system information block (SIB) 1.

[0060] When the UE initially accesses the base station or does not have radio resources for signal transmission (i.e., the UE is in RRC_idle mode), the UE can perform a random access procedure on the base station (operations S103 to S106). First, the UE can 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 through the PDCCH (S105). Next, the UE waits for the reception of the PDCCH as an indication of the base station for conflict resolution. If the UE successfully receives the PDCCH (S106) through the UE's identifier, the random access procedure is terminated. The UE can 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 UE-specific system information, the UE enters the RRC connection mode (RRC_connection mode).

[0061] 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 relatively long interval.

[0062] After the above procedure, the UE receives PDCCH / PDSCH (S107) and sends a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general UL / DL signal transmission procedure. In particular, the UE can receive downlink control information (DCI) through 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 according to 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), etc. Here, CQI, PMI and RI may be included in the channel state information (CSI). In the 3GPP NR system, the UE can send control information such as the above-mentioned HARQ-ACK and CSI through PUSCH and / or PUCCH.

[0063] Figure 4Illustration of SS / PBCH blocks used for initial cell access in a 3GPP NR system.

[0064] When the power is turned on or when the UE wants to access a new cell, it can obtain time and frequency synchronization with the cell and perform an initial cell search process. During the cell search process, the UE can detect the physical cell identity N of the cell. 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 is able to obtain information such as a cell identity (ID).

[0065] 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 and the SSS is sent in the third OFDM symbol through the 56th to 182nd subcarriers. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol in which the PSS is sent, the base station does not send signals through the remaining subcarriers, i.e., the 0th to 55th subcarriers and the 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 subcarriers and the 183rd to 191st subcarriers. The base station sends the physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block except for the above signals.

[0066] [Table 1]

[0067]

[0068] The SS 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, through a combination of three PSS and SSS, specifically so that each physical layer cell ID will be part of only one physical layer cell identifier group. cell ID =3N (1) ID +N (2) IDThe physical layer cell identifier group can be indicated 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 the three unique physical layer identifiers. In addition, the UE can detect the SSS and identify one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d of the PSS PSS (n) are as follows.

[0069] d PSS (n) = 1-2x(m)

[0070]

[0071] 0≤n<127

[0072] Here, x(i+7)=(x(i+4)+x(i))mod2 and is given as

[0073] [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[ 1 1 1 0 1 1 0].

[0074] In addition, the sequence d of SSS SSS (n) are as follows.

[0075] d SSs (n) = [1-2x 0 ((n+m 0 )mod127)][1-2x 1 ((n+m 1 )mod127)]

[0076]

[0077] 0≤n<127

[0078] x 0 (i+7)=(x 0 (i+4)+x 0 (i))mod2

[0079] Here, x 1 (i+7)=(x 1 (i+1)+x 1 (i))mod2, and is given by

[0080] [x 0 (6) x 0 (5) x0 (4) x 0 (3) x 0 (2) x 0 (1) x 0 (0)] = [0 0 0 0 0 0 1]

[0081] [x 1 (6) x 1 (5) x 1 (4) x 1 (3) x 1 (2) x 1 (1) x 1 (0)] = [0 0 0 0 0 0 1].

[0082] 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 transmitted in each half frame will be described. The time slot in which the SS / PBCH block is transmitted may be any one 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, at a carrier frequency of 3GHz or lower, n=0 or 1. 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 lower, 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 starting time point of the SS / PBCH block is the ({2, 8}+14*n)th symbol. In this case, at a carrier frequency of 3 GHz or lower, n=0 or 1. In addition, at a carrier frequency higher than 3 GHz and lower than 6 GHz, it can be n=0, 1, 2, 3. In case D, the subcarrier spacing is 120 kHz and the starting 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 6 GHz or higher, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In case E, the subcarrier spacing is 240 kHz and the starting 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.

[0083] Figure 5 This figure shows the process of sending control information and control channels in the 3GPP NR system. Figure 5 (a), the base station may add a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC with an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more UEs can include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). 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) (S204) (S206). Thereafter, the base station may multiplex DCI based on a PDCCH structure based on a control channel element (CCE) (S208). In addition, the base station may apply additional processes such as scrambling, modulation (e.g., QPSK), interleaving, etc. to the multiplexed DCI (S210), 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 diagram related to multiplexing of a CCE aggregation level and a PDCCH, and illustrates the type of CCE aggregation level for one PDCCH and CCEs transmitted in the control region accordingly.

[0084] Figure 6 Illustration of a control resource set (CORESET) in which a physical downlink control channel (PUCCH) can be transmitted in a 3GPP NR system.

[0085] CORESET is a time-frequency resource in which PDCCH (i.e., a control signal for UE) is transmitted. In addition, the search space to be 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 a maximum of 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 5 In the embodiment of FIG. 1 , CORESET#1 is configured with continuous PRBs, while 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 an embodiment of the present invention, CORESET#1 starts at the first symbol of the time slot, CORESET#2 starts at the fifth symbol of the time slot, and CORESET#9 starts at the ninth symbol of the time slot.

[0086] Figure 7 A method for setting a PUCCH search space in a 3GPP NR system is illustrated.

[0087] 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 referred to as PDCCH candidates) that can be used to send the PDCCH of the UE. The search space may include a common search space that requires UEs of 3GPP NR to search together and a terminal-specific search space or a UE-specific search space that requires a specific UE to search. In the common search space, the UE may monitor the PDCCH that is set so that all UEs in the cell belonging to the same base station search together. In addition, a UE-specific search space may be set for each UE so that the UE monitors the PDCCH assigned to each UE at a search space position that is different according to the UE. In the case of a UE-specific search space, since the limited control region to which the PDCCH can be allocated can be allocated, the search space between the UEs may partially overlap and be 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 as (successfully) detecting / receiving the PDCCH, and when the blind decoding fails, it can be expressed as not detecting / not receiving or not successfully detecting / receiving the PDCCH.

[0088] For convenience of explanation, a PDCCH that is scrambled with a group common (GC) RNTI previously known to one or more UEs in order to send DL control information 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 an RNTI of a specific terminal that is already known to a specific UE in order to send UL scheduling information or DL ​​scheduling information to a specific UE is referred to as a PDCCH of a specific UE. A common PDCCH may be included in a common search space, and a UE-specific PDCCH may be included in a common search space or a UE-specific PDCCH.

[0089] The base station may signal each UE or UE group through the PDCCH about information related to resource allocation of the paging channel (PCH) and the downlink shared channel (DL-SCH) as transmission channels (i.e., DL grant) or information related to resource allocation of the uplink shared channel (UL-SCH) and the hybrid automatic repeat request (HARQ) (i.e., UL grant). The base station may send the PCH transport block and the DL-SCH transport block through the PDSCH. The base station may send data excluding specific control information or specific service data through the PDSCH. In addition, the UE may receive data excluding specific control information or specific service data through the PDSCH.

[0090] The base station can include information in the PDCCH about which UE (one or more UEs) the PDSCH data is sent to and how the PDSCH data will be received and decoded by the corresponding UE, and send the PDCCH. For example, assume that the DCI sent on a specific PDCCH is CRC-masked with RNTI "A", and the DCI indicates that the PDSCH is allocated to radio resources "B" (e.g., frequency position) and indicates transmission format information "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 on the PDCCH using the "A" RNTI, the UE receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the information of the received PDCCH.

[0091] Table 2 shows an embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0092] [Table 2]

[0093] PUCCH format Length of 0FDM symbol Number of bits 0 1-2 ≤2 1 4-14 ≤2 2 1-2 ＞2 3 4-14 ＞2 4 4-14 ＞2

[0094] PUCCH can be used to transmit the following UL control information (UCI).

[0095] - Scheduling Request (SR): information for requesting UL UL-SCH resources.

[0096] -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 was successfully received. The HARQ-ACK response includes a positive ACK (abbreviated as 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.

[0097] - Channel State Information (CSI): Feedback information about the DL channel. The UE generates it based on the CSI-Reference Signal (RS) sent by the base station. Multiple Input Multiple Output (MIMO) related feedback information includes Rank Indicator (RI) and Precoding Matrix Indicator (PMI). The CSI can be divided into CSI Part 1 and CSI Part 2 according to the information indicated by the CSI.

[0098] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, various channel environments, and frame structures.

[0099] PUCCH format 0 is a format capable of delivering 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 that is cyclically shifted (CS) from the base sequence used in PUCCH format 0. As a result, the UE can obtain frequency diversity gain. In more detail, the UE can obtain frequency diversity gain based on M bit BitUCI(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 base sequence of length 12. When the number of cyclic shifts available to the UE is 12 and M bit =1, 1-bit UCI 0 and 1 can be mapped to two cyclic shift sequences respectively, and the cyclic shift values ​​of the two cyclic shift sequences have a difference of 6. In addition, when M bit=2, 2-bit UCI 00, 01, 11 and 10 may be mapped to four cyclic shift sequences having a difference of 3 in cyclic shift value, respectively.

[0100] PUCCH format 1 can deliver 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 BPSK modulated. The UE can use quadrature phase shift keying (QPSK) to modulate M bit =2 for 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 may be the base sequence for PUCCH format 0. The UE extends the even-numbered OFDM symbols to which PUCCH format 1 is allocated by a 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 to be used. The demodulation reference signal (DMRS) may be extended with the OCC and mapped to the odd-numbered OFDM symbols of PUCCH format 1.

[0101] PUCCH format 2 can deliver more than 2 bits of UCI. PUCCH format 2 can be sent through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is sent in two OFDM symbols, the sequences sent in different RBs through the two OFDM symbols can be the same as 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, for M bit UCI(M bit >2) Perform bit-level scrambling, QPSK modulation, and map it to RBs of one or two OFDM symbols. Here, the number of RBs can be one of 1 to 16.

[0102] PUCCH format 3 or PUCCH format 4 can deliver more than 2 bits of UCI. PUCCH format 3 or PUCCH format 4 can be transmitted 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 uses π / 2-binary phase shift keying (BPSK) or QPSK to transmit the OFDM symbol. bit UCI(M bit >2) is modulated to generate complex-valued symbols d(0) to d(M symb -1). Here, when π / 2-BPSK is used, M symb =M bit , and when 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 may 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.

[0103] 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 may transmit is greater than the maximum number of RBs that may be used by PUCCH format 2, PUCCH format 3, or PUCCH format 4, the UE may not transmit some UCI information according to the priority of the UCI information, but may transmit only the remaining UCI information.

[0104] 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 by RRC signaling. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted by N OFDM symbols of the time axis, the first hop may have floor(N / 2) OFDM symbols and the second hop may have ceiling(N / 2) OFDM symbols.

[0105] PUCCH format 1, PUCCH format 3 or PUCCH format 4 can be configured to be repeatedly transmitted in multiple time slots. In this case, the number K of time slots in which PUCCH is repeatedly transmitted can be configured by RRC signal. The repeatedly transmitted PUCCH must start at 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 transmit the PUCCH is indicated as a DL symbol by RRC signal, the UE may not transmit the PUCCH in the corresponding time slot and delay the transmission of the PUCCH to the next time slot to transmit the PUCCH.

[0106] 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 operation 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 operation or in paired spectrum operation 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). The UE may not perform reception or transmission in time-frequency resources other than the activated BWP. The activated BWP may be referred to as an active BWP.

[0107] 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 with 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 with 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 with 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.

[0108] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0109] Carrier aggregation is a method in which a UE uses multiple frequency blocks or cells (in a logical sense) configured with UL resources (or component carriers) and / or DL ​​resources (or component carriers) as one large logical frequency band so that a wireless communication system uses a wider frequency band. One component carrier may also be referred to as a primary cell (PCell) or a secondary cell (SCell) or a primary SCell (PScell). However, hereinafter, for the convenience of description, the term "component carrier" is used.

[0110] refer to Figure 8 As 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, but this is only an example, and each component carrier may have a different bandwidth. In addition, 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.

[0111] A different center frequency may be used for each component carrier. Alternatively, a common center frequency may be used in physically adjacent component carriers. Figure 8 In the embodiment of the present invention, all component carriers are physically adjacent, then the center frequency A can be used in all component carriers. In addition, assuming that the respective 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.

[0112] When the total system frequency band is extended by carrier aggregation, the frequency band used for communication with each UE can be defined in units of component carriers. UE A can use 100 MHz as the total system frequency band and perform communication using all five component carriers. UE B 1 ~B 5 It is possible to perform communication using only a 20 MHz bandwidth and one component carrier. 1 and C 2 The 40 MHz bandwidth and two component carriers may be used to perform communication. The two component carriers may be logically / physically adjacent or non-adjacent. 1 represents the case of using two non-adjacent component carriers, and UE C 2 Indicates the case of using two adjacent component carriers.

[0113] 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.

[0114] refer to Fig. 9 (a), in FDD mode, a general wireless communication system can perform data transmission or reception through a DL frequency band and a UL frequency band corresponding thereto. In another specific embodiment, in TDD mode, a wireless communication system can divide a radio frame into a UL time unit and a DL time unit in the time domain, and perform data transmission or reception through the UL / DL time unit. 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 ULCC 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.

[0115] 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 is able to change the CCs to be activated / deactivated and change the number of CCs to be activated / deactivated. If the base station allocates CCs available to the UE as cell-specific or UE-specific, at least one of the allocated CCs will not be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is 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).

[0116] 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 may be configured with DL resources alone, or may be configured with a combination of DL resources and UL resources. When carrier aggregation is supported, the link between the carrier frequency of the DL resources (or DL ​​CC) and the carrier frequency of the UL resources (or UL CC) may 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 the PCell, and the cell corresponding to the SCC is called the 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 UE capabilities, the serving cell may be configured with one PCell and zero or more SCells. In the case of a UE that is in the RRC_CONNECTED state but is not configured for carrier aggregation or does not support carrier aggregation, only one serving cell is configured with only the PCell.

[0117] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" referring to a certain 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 representing 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.

[0118] Fig.10 is a 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 is a search area 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 an upper layer.

[0119] exist Fig.10In 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 a PDCCH monitoring CC. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) higher layer signaling, CIF is disabled, and each DL CC is able to send only the PDCCH for scheduling its PDSCH without CIF according to the NR PDCCH rule (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 use CIF to send not only the PDCCH for scheduling the PDSCH of DL CC A but also the PDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling). On the other hand, PDCCH is not sent in another DL CC. Therefore, the UE monitors a PDCCH not including a CIF to receive a PDSCH scheduled by a self-carrier, or monitors a PDCCH including a CIF to receive a PDSCH scheduled by a cross-carrier, according to whether cross-carrier scheduling is configured for the UE.

[0120] on the other hand, Fig. 9 and Fig.10 The 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.

[0121] 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 using various types of wireless communication devices or computing devices that ensure portability and mobility. The UE may be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), and the like. In addition, in an embodiment of the present disclosure, the base station controls and manages cells (e.g., macro cells, femto cells, micro cells, and the like) corresponding to a service area, and performs functions such as signal transmission, channel designation, channel monitoring, self-diagnosis, and relaying. The base station may be referred to as a next generation Node B (gNB) or an access point (AP).

[0122] 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 .

[0123] 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 overall 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.

[0124] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and performs wireless LAN access using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123 in an internal or external form. In the drawings, the communication module 120 is shown as an integrally integrated module, but unlike the drawings, each network interface card can be independently arranged according to a circuit configuration or usage.

[0125] 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 in accordance with a cellular communication standard or protocol in a frequency band below 6 GHz supported by the corresponding NIC module.

[0126] 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 an 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 in accordance with a cellular communication standard or protocol in a frequency band greater than 6 GHz supported by the corresponding NIC module.

[0127] 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 an unlicensed frequency band communication service 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 protocol of the frequency band supported by the corresponding NIC module.

[0128] The memory 130 stores a control program and various data thereof used in the UE 100. Such a control program may include a prescribed program required to perform wireless communication with at least one of the base station 200, an external device, and a server.

[0129] Next, the user interface 140 includes various input / output means provided in the UE 100. In other words, the user interface 140 may receive user input using various input means, 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 means.

[0130] 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.

[0131] 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 .

[0132] First, the processor 210 may execute various instructions or programs and process the internal data of the base station 200. In addition, the processor 210 may control the entire operation of each unit in the base station 200 and control the transmission and reception of data 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 time slot configuration notified by the signal.

[0133] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and performs wireless LAN access using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223 in an internal or external form. In the drawings, the communication module 220 is shown as an integrally integrated module, but unlike the drawings, each network interface card can be independently arranged according to a circuit configuration or usage.

[0134] 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 in accordance with a cellular communication standard or protocol in a frequency band less than 6 GHz supported by the corresponding NIC module.

[0135] 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 in accordance with a cellular communication standard or protocol in a frequency band of 6 GHz or higher supported by the corresponding NIC module.

[0136] 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 an unlicensed frequency band communication service 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 perform wireless communication with at least one of the base station 100, the external device, and the server independently or dependently in accordance with the unlicensed frequency band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0137] Fig.111 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 separately are logically divided elements of the device. Therefore, the aforementioned elements of the device can be installed in a single chip or multiple chips according to the design of the device. 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, the user interface 140, the display unit 150, etc. can be additionally provided in the base station 200 when necessary.

[0138] The base station may specify the type of each symbol as one of an uplink symbol, a downlink symbol, and a flexible symbol. In this case, the type of the symbol indicates the purpose of the symbol. The base station may configure the type of each symbol through system information block 1 (SIB1). Configuring the type of each symbol in the above manner is called "semi-static slot configuration". The UE may perform transmission or reception based on the type of symbol configured by the base station for the UE. Through the dynamic slot format information (SFI) sent via the PDCCH, the symbol configured as a flexible symbol for the UE according to the semi-static slot configuration may be specified as one of an uplink symbol, a downlink symbol, and a flexible symbol. The UE may not expect to receive downlink transmission in a symbol indicated as an uplink symbol by the semi-static slot configuration and the dynamic SFI. The UE may not expect to schedule uplink transmission in a symbol indicated as a downlink symbol by the semi-static slot configuration and the dynamic SFI. The UE may not expect to receive downlink transmission or schedule uplink transmission in a symbol indicated as a flexible symbol by the dynamic SFI. In addition, the symbol configured as a downlink symbol or an uplink symbol by the RRC signal may not be allowed to change to another symbol type.

[0139] The UE may monitor the PDCCH including the dynamic SFI in each periodic monitoring period. Specifically, the DCI includes the dynamic SFI, and the PDCCH includes the DCI. In this case, the monitoring period may be configured by the base station. The UE may perform blind decoding in order to receive the PDCCH in each monitoring period. If the UE fails to receive the PDCCH, the UE cannot determine whether the flexible symbol specified in the semi-static timeslot configuration is an uplink symbol, a downlink symbol, or a flexible symbol. If the UE fails to receive the PDCCH, the UE may perform operations different from the case of obtaining the dynamic SFI through the PDCCH.

[0140] The base station can use RRC signals to configure a slot format combination that can be indicated by a dynamic SFI. The slot format combination can be defined by a slot format index. The slot format index indicates a slot format that indicates the type of symbol included in a slot. The slot format combination configured by the RRC signal can indicate the slot format of a slot. In addition, the slot format combination configured by the RRC signal can indicate the slot format of multiple slots. Each slot can be assigned the slot format shown in Table 3.

[0141] [Table 3]

[0142]

[0143] In Table 3, "D" represents a downlink symbol, "U" represents an uplink symbol, and "X" represents a flexible symbol. As shown in Table 3, a maximum of two DL / UL switchings may be allowed within one slot.

[0144] As described above, the base station can use the dynamic SFI to configure the slot format of one time slot or the slot format of multiple time slots. The value of the dynamic SFI may indicate an entry representing a combination of specific time slot formats. In this case, the entry may be referred to as a "time slot format combination index". The slot format of one time slot or the slot format of multiple time slots indicated by the dynamic SFI may be referred to as a "time slot format combination". That is, the time slot format combination indicates the type of symbols included in one or more time slots. The UE may determine the time slot configuration configured for the UE based on the dynamic SFI. When the time slot format combination indicated by the value of the dynamic SFI is different from the time slot format combination previously configured for the UE, the UE may determine that the time slot format combination configured for the UE has changed.

[0145] Specifically, the slot format combination that can be indicated by the dynamic SFI configured as an RRC signal can indicate the slot format of one slot or the slot format of multiple slots. To this end, as shown in Table 4, the base station can configure the slot format combination for the slot format of one slot or multiple slots in Table 3. In Table 4, the slot format combination index 0 of the dynamic SFI can indicate the slot format of one slot Slot#0, and the slot format of the corresponding slot Slot#0 can be configured as a slot format corresponding to the slot format index value "4". Referring to Table 3, the index 4 of the slot format combination represents the slot format {D, D, D, D, D, D, D, D, D, D, X, X} corresponding to the slot format index value "4" in Table 3. In Table 4, the slot format combination index value 1 of the dynamic SFI represents the slot format of two slots Slot#0 and Slot#1. The first time slot Slot#0 follows the time slot format corresponding to the time slot format index value "31", and the second time slot Slot#1 is configured as a time slot format corresponding to the time slot format index value "10". The time slot format corresponding to the index value "31" in Table 3 is {D, D, D, D, D, D, D, D, D, D, D, X, U, U}, and the time slot format corresponding to the index value "10" is {X, U, U, U, U, U, U, U, U, U, U, U, U, U}. As described above, the base station can configure the time slot format combination for the UE through the dynamic SFI. In this case, the dynamic SFI represents the time slot format combination index indicating the time slot format combination. The base station can configure the time slot format combination that can be indicated by the dynamic SFI through RRC configuration. The UE can receive the dynamic SFI and can obtain the time slot format combination index indicated by the dynamic SFI. The UE can determine that the time slot format has been configured for the UE based on the time slot format combination corresponding to the obtained time slot format combination index.

[0146] [Table 4]

[0147] index Time slot #0 Time Slot #1 Time Slot #2 ... Time slot #255 0 4 - - - - 1 31 10 - - - 2 12 8 7 - - 3 17 5 5 ... 10 ... 4095 11 20 55 ... 1

[0148] The UE can determine the number of dynamic SFI bits to be monitored by the UE based on the number of time slot format combinations that the base station can indicate through the dynamic SFI. The UE can determine the number of dynamic SFI bits to be monitored by the UE as ceil(log2(N)). In this case, "N" is the number of time slot format combinations that the base station can indicate through the dynamic SFI. In addition, ceil(x) represents the smallest number among the integers equal to or greater than "x". If the number of time slot format combinations that the base station can indicate through the dynamic SFI is 1, there may be problems with the operation of the UE. For example, if the number of time slot format combinations that the base station can indicate through the dynamic SFI is 1, the number of dynamic SFI bits to be monitored by the UE can be determined to be 0. In this case, because the number of dynamic SFI bars is 0, the UE cannot monitor the PDCCH that sends the dynamic SFI. Therefore, there may be a problem that the UE cannot perform operations based on the success or failure of the reception of the dynamic SFI.

[0149] In an embodiment of the present disclosure, if the number of slot format combinations that the base station can indicate through the dynamic SFI is 1, the UE can determine that the number of dynamic SFI bits to be monitored by the UE is 1. If the number of slot format combinations that the base station can indicate through the dynamic SFI is greater than 1, the UE can determine the number of dynamic SFI bits to be monitored by the UE as ceil(lOg 2 (N / 2))+1. Here, "N" is the number of slot format combinations that the base station can indicate through the dynamic SFI. In addition, ceil(x) represents the smallest number among integers equal to or greater than "x". In addition, regardless of the number of slot format combinations that the base station can indicate through the dynamic SFI, the UE can determine that the number of dynamic SFI bits to be monitored by the UE is ceil(log 2 (N / 2))+1. In addition, regardless of the number of time slot format combinations that the base station can indicate through the dynamic SFI, the UE can determine that the number of dynamic SFI bits to be monitored by the UE is max(ceil(log2(N)), 1). Here, max(a, b) represents the larger value of "a" and "b". In this embodiment, the number of dynamic SFI bits according to the number of time slot format combinations of the UE can be shown in Table 5. According to Table 5, the above ceil(log2(N)) is 2 (N / 2))+1 and max(ceil(log 2 (N)), 1) represents the number of the same dynamic SFI bits. If the number of slot format combinations is 1, the number of dynamic SFI bits is 1. Therefore, the UE may expect at least one bit of the dynamic SFI to be transmitted and may monitor the PDCCH in which the dynamic SFI is transmitted.

[0150] [Table 5]

[0151]

[0152] When the number of time slot format combinations that the base station can indicate through the dynamic SFI is 1, depending on the value of the dynamic SFI, the UE can operate as follows. When the value of the dynamic SFI is 0, the UE can determine that the time slot has been configured based on the entry of a time slot format combination configured by the base station for the UE through the RRC signal. In addition, the UE may not expect the value of the dynamic SFI to be 1. Specifically, when the value of the dynamic SFI is 1, the UE can ignore the dynamic SFI. Specifically, if the value of the dynamic SFI is 1, the UE can determine that the dynamic SFI corresponds to an error. In another specific embodiment, when the value of the dynamic SFI is 1, the UE can perform an operation corresponding to a situation where the PDCCH including the dynamic SFI fails to be received. In another specific embodiment, when the value of the dynamic SFI is 1, the UE can cancel the transmission and reception of all semi-static RRC-configured measurement signals. The RRC-configured measurement signal may include at least one of CSI-RS measurement, periodic SRS transmission, and PDCCH monitoring.

[0153] In another embodiment of the present invention, the UE may not expect that the number of slot format combinations that the base station can indicate through the dynamic SFI is 1. In this case, the UE may determine that the number of dynamic SFI bits to be monitored by the UE is ceil(log 2 N). Here, "N" is the number of slot format combinations that the base station can indicate through the dynamic SFI. In addition, ceil(x) represents the smallest number among integers equal to or greater than "x".

[0154] In another embodiment of the present invention, when the number of slot format combinations that the base station can indicate through the dynamic SFI is 1, the UE can determine that the number of dynamic SFI bits to be monitored by the UE is 0. In this case, the UE may not monitor the PDCCH including the dynamic SFI. The UE may not monitor the PDCCH including the dynamic SFI, and may determine that the slot has been configured according to an entry of a slot format combination configured by the base station for the UE through an RRC signal.

[0155] In the above embodiment, the UE can determine the length of the dynamic SFI based on the maximum value of the slot format combination index that can be indicated by the dynamic SFI sent to the UE. For ease of description, the indicator of the slot format combination will be referred to as "SlotFormatCombinationId", and the maximum value of the slot format combination index indicated by the indicator of the slot format combination will be referred to as "maxSFIindex". For example, if 0, 1, 2, and 3 are configured as SlotFormatCombinationId that can be indicated by the dynamic SFI for any one UE, the UE can determine maxSFIindex to be 3.

[0156] Fig.12 The format of the indicator of the slot format combination according to an embodiment of the present invention is shown.

[0157] In an embodiment of the present invention, when maxSFIindex is 0, the UE may determine that the number of dynamic SFI bits to be monitored by the UE is 1. When maxSFIindex is greater than 0, the UE may determine that the number of dynamic SFI bits to be monitored by the UE is ceil(log 2 (maxSFIindex+1)). Here, ceil(x) represents the smallest number among integers equal to or greater than "x". Regardless of the number of slot format combinations that the base station can indicate through dynamic SFI, the UE can determine that the number of dynamic SFI bits to be monitored by the UE is max(ceil(log 2 (maxSFIindex+1)), 1). Here, max(a, b) represents a larger value of "a" and "b". Table 6 shows an example of the number of dynamic SFI bits according to maxSFIindex. According to Table 6, if maxSFIindex according to an embodiment of the present invention is greater than 0, the UE determines the number of dynamic SFI bits to be monitored by the UE as ceil(log 2 (maxSFIindex+1)) or max(ceil(log 2 (maxSFIindex+1)), 1), which indicates the number of the same dynamic SFI bits. In addition, if the value of maxSFIindex is 0, it indicates one bit. The UE may expect that at least one bit of the dynamic SFI will be transmitted, and may monitor the PDCCH in which the dynamic SFI is transmitted.

[0158] [Table 6]

[0159]

[0160] When maxSFIindex is 0, depending on the value of the dynamic SFI, the UE may operate as follows. When the dynamic SFI value is 0, the UE may determine that the time slot has been configured based on a time slot entry configured for the UE by the base station through an RRC signal. In addition, the UE may not expect the dynamic SFI value to be 1. In another specific embodiment, when the value of the dynamic SFI is 1, the UE may perform an operation corresponding to a situation where the PDCCH including the dynamic SFI fails to be received. In another specific embodiment, when the value of the dynamic SFI is 1, the UE may cancel the transmission and reception of all semi-static RRC-configured measurement signals. The RRC-configured measurement signal may include at least one of CSI-RS measurement, periodic SRS transmission, and PDCCH monitoring.

[0161] In another embodiment of the present invention, the UE may not expect the maxSFIindex that the base station can indicate through the dynamic SFI to be 0. In this case, the UE may determine the number of dynamic SFI bits to be monitored by the UE as ceil(log 2 (maxSFIindex+1)). Here, maxSFIindex is the maximum value among the indices of the slot format combinations that the base station can indicate through the dynamic SFI. In addition, ceil(x) represents the minimum number among integers equal to or greater than "x".

[0162] In another embodiment of the present invention, when the number of slot format combination indexes that the base station can indicate through the dynamic SFI is 0, the UE can determine that the number of dynamic SFI bits to be monitored by the UE is 0. In this case, the UE may not monitor the PDCCH including the dynamic SFI. The UE may not monitor the PDCCH including the dynamic SFI, and may determine that the time slot has been configured according to an entry of a slot format combination configured by the base station for the UE through an RRC signal.

[0163] The above-described embodiments may be applied to a case where a PDCCH includes a plurality of dynamic SFIs on a plurality of cells as well as a case where a PDCCH includes a dynamic SFI on one cell.

[0164] In the case where a PDCCH includes multiple dynamic SFIs on multiple cells, the UE can determine the length of the dynamic SFI as follows. In this case, the base station can configure a time slot format combination for the UE in each cell. The UE can receive the PDCCH and can determine the entry or time slot format combination index of the time slot format combination for each cell. In one embodiment of the present invention, the bit length of the dynamic SFI of a cell can be determined according to the number of time slot format combinations configured for the corresponding cell. When the number of time slot format combinations of cell "c" is N CWhen, as in the above embodiment for a cell, the UE may determine that the length of the dynamic SFI is max(ceil(log 2 (N C )), 1). In another embodiment of the present invention, the UE may determine the length of the dynamic SFI of the corresponding cell according to the maximum value of the slot format combination index configured in a cell. When the maximum value of the slot format combination index of the cell "c" is maxSFIindex C When the UE determines the length of the dynamic SFI to be max(ceil(log 2 (maxSFIindex C +1)), 1), as in the above embodiment for one cell.

[0165] In the case where the length of the dynamic SFI of at least one cell is greater than or equal to 1 bit, even if the length of the dynamic SFI of another cell is 0 bits, the UE can monitor the PDCCH including multiple dynamic SFIs because the bit length of the multiple dynamic SFIs is not 0 bits. The UE can operate according to the following embodiments. When a PDCCH includes two dynamic SFIs on at least two cells, the UE can determine the bit lengths of the dynamic SFIs on the two cells as follows. The UE can determine the bit length (payload length) of the dynamic SFI on the first cell. 1 ) is determined as ceil(log 2 (N 1 )) or ceil(log 2 (maxSFIindex 1 +1)). The UE may determine the length of the dynamic SFI on the second cell as ceil(log 2 (N 2 )) or ceil(log 2 (maxSFIindex 2 +1)). When two dynamic SFI (payload 1 +payload 2 ) is greater than 0, the bit length of the first dynamic SFI is payload 1 , and the bit length of the second dynamic SFI is payload 2 The bit length of the entire dynamic SFI is payload 1 +payload 2 If two dynamic SFI (payload 1 +payload 2 ) is 0, the UE may assume that the length of the entire dynamic SFI is payload 1 +payload2 =1. That is, if the sum of the lengths of two dynamic SFIs is 0, the UE may monitor the PDCCH under the assumption that the total number of dynamic SFI bits included in the PDCCH is at least 1. In this case, when the UE successfully receives the PDCCH, the UE may determine the slot format in each cell according to the slot format combination corresponding to each cell. When the UE fails to receive the PDCCH, the UE may perform an operation corresponding to a case in which the dynamic SFI is not received in both cells. Fig.13 The operation of the UE according to the embodiment of the present invention is shown.

[0166] The UE determines the number of dynamic SFI bits to be monitored by the UE (S1301). In this case, according to the above embodiment, the UE can determine the number of dynamic SFI bits to be monitored by the UE. Specifically, the number of dynamic SFI bits can be determined based on the maximum value of the time slot format combination index that can be indicated by the dynamic SFI sent to the UE. When the maximum value of the time slot format combination index that can be indicated by the dynamic SFI sent to the UE is 0, the UE can determine that the number of dynamic SFI bits is 1. Specifically, the UE can determine the number of dynamic SFI bits based on max(ceil(log 2 (maxSFIindex+1)),1) determines the number of dynamic SFI bits. Here, max(a, b) may represent the larger value of "a" and "b", and maxSFIindex may represent the maximum value of the time slot format combination index that can be indicated by the dynamic SFI sent to the UE. In another specific embodiment, the UE may determine the number of dynamic SFI bits based on the number of time slot format combinations that can be indicated by the dynamic SFI sent to the UE. When the number of time slot format combinations that can be indicated by the dynamic SFI sent to the UE is 1, the UE may determine that the number of dynamic SFI bits to be monitored by the UE is 1. Specifically, the UE may determine the number of dynamic SFI bits to be monitored by the UE based on max(ceil(log 2 (N)), 1) Determine the number of dynamic SFI bits. "N" represents the number of slot format combinations that can be indicated by the dynamic SFI sent to the UE. In addition, according to the reference Fig.13 As described above in the previous figures, the UE may determine the number of dynamic SFI bits to be monitored by the UE.

[0167] The UE may monitor the PDCCH including the dynamic SFI based on the determined number of bits (S1303). When the UE receives the dynamic SFI, the UE may determine the slot format combination configured for the UE based on the value of the dynamic SFI. The UE may perform transmission or reception based on the slot format combination configured for the UE. When the base station configures only one slot format combination for the UE and the entry of the slot format combination or the slot format combination index is 0, the UE may operate as follows. In a specific embodiment, when the number of dynamic SFI bits is 1 and the value of the dynamic SFI is 1, the UE may cancel the transmission and reception of the measurement signal configured by the semi-static RRC. The measurement signal configured by the RRC may include at least one of CSI-RS measurement, periodic SRS transmission, and PDCCH monitoring. In another specific embodiment, when the number of dynamic SFI bits is 1 and the value of the dynamic SFI is 1, the UE may perform an operation corresponding to the situation where the PDCCH including the dynamic SFI fails to be received. In another specific embodiment, when the number of dynamic SFI bits is 1, the UE may not expect the value of the dynamic SFI to be 1.

[0168] 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.

[0169] The method and system of the present disclosure are described in conjunction with specific embodiments, and a computer system with a general hardware architecture may be used to implement configuration elements, part, or all of the operations of the present disclosure.

[0170] The foregoing description of the present disclosure has been presented 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 essential features of the present disclosure. Therefore, these embodiments as described above are proposed only for illustrative purposes, without limiting 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.

[0171] The scope of the present disclosure is presented 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 user equipment in a wireless communication system, the user equipment comprising: processor, wherein the processor is configured to: monitor a physical downlink control channel (PDCCH), determine the number of dynamic SFI bits of the PDCCH based on a maximum value of a slot format combination index indicated by dynamic slot format information (SFI) that can be received by the user equipment, wherein the slot format combination index indicated by the dynamic SFI received by the user equipment identifies a slot format combination configured for the user equipment, wherein the slot format combination indicates a type of symbol included in one or more slots, and wherein the type of symbol is any one of a downlink symbol, an uplink symbol, and a flexible symbol, The processor is further configured to determine the number of dynamic SFI bits according to max(ceil(log2(maxSFIindex+1)),1), where max(a, b) represents the maximum value of "a" and "b", and Among them, maxSFIindex represents the maximum value of the time slot format combination index.

2. The user equipment according to claim 1, wherein: When the user equipment receives the dynamic SFI, the processor is configured to: determine a time slot format combination configured for the user equipment based on a value of the dynamic SFI, and perform transmission or reception based on the determined time slot format combination.

3. The user equipment according to claim 1, wherein: The processor is configured to, when a maximum value of the slot format combination index is 0 and a value of the dynamic SFI received by the user equipment is 1, perform an operation corresponding to a case where a PDCCH including the dynamic SFI is not received.

4. The user equipment according to claim 2, wherein: The processor is configured to cancel transmission and reception of a measurement signal configured by a semi-static radio resource control (RRC) when a maximum value of the slot format combination index is 0 and a value of the dynamic SFI received by the user equipment is 1.

5. A method for operating a user equipment in a wireless communication system, the method comprising: Monitoring the Physical Downlink Control Channel (PDCCH); determining the number of dynamic slot format combination indexes of the PDCCH based on a maximum value of a slot format combination index indicated by dynamic slot format information (SFI) that can be received by the user equipment, wherein the slot format combination index indicated by the dynamic SFI received by the user equipment identifies a slot format combination configured for the user equipment, wherein the slot format combination indicates a type of a symbol included in one or more slots, and wherein the type of the symbol is any one of a downlink symbol, an uplink symbol, and a flexible symbol, Wherein, determining the number of the dynamic SFI bits comprises determining the number of the dynamic SFI bits according to max(ceil(log2(maxSFIindex+1)),1), where max(a, b) represents the maximum value of "a" and "b", and Among them, maxSFIindex represents the maximum value of the time slot format combination index.

6. The method according to claim 5 further comprises, when the user equipment receives the dynamic SFI, determining a time slot format combination configured for the user equipment based on the value of the dynamic SFI, and performing transmission or reception based on the determined time slot format combination. 7 . The method according to claim 5 , further comprising, when a maximum value of the slot format combination index is 0 and a value of the dynamic SFI is 1, performing an operation corresponding to a case where a PDCCH including the dynamic SFI is not received.

8. The method according to claim 6, further comprising, when a maximum value of the slot format combination index is 0 and a value of the dynamic SFI is 1, canceling transmission and reception of a measurement signal configured by a semi-static radio resource control (RRC).

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