Method, device and system for transmitting and receiving control channels in a wireless communication system

Abstract

To provide a method for informing a terminal of information about slot configuration, a communication method using the slot configuration, and a device therefor.SOLUTION: In a wireless communication system, a method includes steps of: receiving configuration information about a periodic signal via upper layer signals, in which the transmitting / receiving position of the periodic signal is made up of a first set of symbols in each periodically set slot; monitoring a PDCCH relating to the slot configuration of a first slot in order to receive the slot configuration information for the first slot in which the transmitting / receiving position of the periodic signal is located; and performing a process for transmitting / receiving the periodic signal in the first slot. If the first set of symbols in the first slot is designated as flexible symbols by the upper layer, then the transmission / reception of the periodic signal in the first slot is selectively performed according to detection results of the PDCCH.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to wireless communication systems, and more particularly, the present invention relates to a method and apparatus for transmitting and receiving a control channel in a wireless communication system supporting time division multiple access. [Background technology]

[0002] The 3GPP NR (3rd Generation Partnership Project New Radio) system improves the spectrum efficiency of the network, allowing carriers to provide more data and voice services with a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to large-capacity voice support. The advantages of the NR system are that it has a simple architecture and low operating costs, such as high throughput, low latency, support for FDD (Frequency Division Duplex) and TDD (Time Division Duplex), and improved end user environment on the same platform.

[0003] For more efficient data processing, the Dynamic TDD of the NR system uses a method of varying the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols used for uplink and downlink depending on the data traffic direction of the user of the cell. For example, if the downlink traffic of a cell is larger than the uplink traffic, the base station allocates a large number of downlink OFDM symbols to a slot (or subframe). Information about the slot configuration should be transmitted to the terminal. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2019-528633) [Non-patent literature]

[0005] [Non-licensed document 1] Samsung,On UE-Group Common PDCCH[online],3GPP TSG RAN WG1 adhoc_NR_AH_1709 R1-1715981,Internet:<URL:http: / / www.3gpp.org / ftp / tsg_ran / WG1_RL1 / TSGR1_AH / NR_AH_1709 / Docs / R1-1715981.zip> ,September 12, 2017 [Non-licensed document 2] Qualcomm Incorporated,Contents of group common PDCCH[online],3GPP TSG RAN WG1 #88b R1-1705604,Internet:<URL:http: / / www.3gpp.org / ftp / tsg_ran / WG1_RL1 / TSGR1_88b / Docs / R1-1705604.zip> ,March 25, 2017 [Non-licensed document 3] NTT DOCOMO, INC.,Remaining issues on group-common PDCCH[online],3GPP TSG RAN WG1 adhoc_NR_AH_1709 R1-1716096,Internet:<URL:http: / / www.3gpp.org / ftp / tsg_ran / WG1_RL1 / TSGR1_AH / NR_AH_1709 / Docs / R1-1716096.zip> ,September 12, 2017

Non-licensed Document 4

[0006] An object of the present invention is to provide a method for informing a terminal of information regarding a slot configuration, a communication method according to the slot configuration, and an apparatus therefor.

[0007] The technical problems to be solved by the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0008] As a first aspect of the present invention, there is provided a method for a terminal in a wireless communication system to determine reception of a downlink signal, the method comprising the steps of: receiving configuration information regarding a periodic signal via an upper layer signal, the reception position of the periodic signal consisting of a first symbol set in each slot that is periodically set; monitoring a physical downlink control channel (PDCCH) regarding a slot configuration of the first slot to receive slot configuration information for the first slot in which the reception position of the periodic signal exists; and performing a process for receiving the first periodic signal in the first slot, wherein if the first symbol set in the first slot is designated as flexible symbols by an upper layer, reception of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH, and the flexible symbol means a symbol whose usage is redesignated to DL (downlink), UL (uplink), or flexible according to the slot configuration information of the PDCCH.

[0009] As a second aspect of the present invention, there is provided a method for a terminal used in a wireless communication system, comprising: a communication module; and a processor, the processor being configured to receive configuration information regarding a periodic signal via an upper layer signal, the reception position of the periodic signal consisting of a first symbol set in each slot set periodically; monitor a PDCCH related to a slot configuration of the first slot to receive slot configuration information for the first slot in which the reception position of the periodic signal exists; and perform a process for receiving the first periodic signal in the first slot; if the first symbol set in the first slot is designated as flexible symbols by an upper layer, reception of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH; and the flexible symbol means a symbol whose usage is redesignated to DL, UL, or flexible according to the slot configuration information of the PDCCH.

[0010] In the first and second aspects, the downlink periodic signal includes a channel status information reference signal (CSI-RS).

[0011] In the first and second aspects, the PDCCH includes a GC (group common)-PDCCH having a slot configuration for the first slot, and if the first symbol set in the first slot is designated as flexible symbols by a higher layer, reception of the periodic signal in the first slot is skipped if the GC-PDCCH is not detected.

[0012] In the first and second aspects, the PDCCH includes a GC-PDCCH having a slot configuration for the first slot, and if the first symbol set in the first slot is designated as a flexible symbol by an upper layer, if slot configuration information detected from the GC-PDCCH indicates the first symbol set as flexible, reception of the periodic signal in the first slot is skipped.

[0013] In the first and second aspects, reception of the periodic signal from the first slot occurs only if slot configuration information detected from the GC-PDCCH indicates the first symbol set to DL symbols.

[0014] In the first and second aspects, the PDCCH includes a user specific (US)-PDCCH having downlink scheduling information, and when the first symbol set in the first slot is designated as a flexible symbol by a higher layer, if a DL signal is scheduled in the first symbol set by the US-PDCCH, reception of the periodic signal is performed in the first slot.

[0015] As a third aspect of the present invention, there is provided a method for a terminal in a wireless communication system to determine transmission of an uplink signal, the method comprising the steps of: receiving configuration information regarding a periodic signal via an upper layer signal, the transmission position of the periodic signal consisting of a first symbol set in each slot that is periodically set; monitoring a PDCCH regarding a slot configuration of the first slot to receive slot configuration information for the first slot in which the transmission position of the periodic signal exists; and performing a process for transmitting the first periodic signal in the first slot, wherein if the first symbol set in the first slot is designated as flexible symbols by an upper layer, transmission of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH, and the flexible symbol means a symbol whose usage is redesignated to DL, UL, or flexible according to the slot configuration information of the PDCCH.

[0016] In a fourth aspect of the present invention, there is provided a terminal for use in a wireless communication system, comprising a communication module and a processor, wherein the processor is configured to receive configuration information regarding a periodic signal via an upper layer signal, a transmission position of the periodic signal consisting of a first symbol set in each slot set periodically, monitor a PDCCH related to a slot configuration of the first slot to receive slot configuration information for the first slot in which the transmission position of the periodic signal exists, and perform a process for transmitting the first periodic signal in the first slot, and if the first symbol set in the first slot is designated as a flexible symbol by an upper layer, transmission of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH, and the flexible symbol means a symbol whose usage is redesignated to DL, UL, or flexible according to the slot configuration information of the PDCCH.

[0017] In the third and fourth aspects, the periodic signal includes a sounding reference signal (SRS).

[0018] In the third and fourth aspects, the PDCCH includes a GC-PDCCH having slot configuration information for the first slot, and if the first symbol set in the first slot is designated as flexible symbols by an upper layer, transmission of the periodic signal in the first slot is skipped if the GC-PDCCH is not detected.

[0019] In the third and fourth aspects, the PDCCH includes a GC-PDCCH having slot configuration information for the first slot, and if the first symbol set in the first slot is designated as a flexible symbol by an upper layer, if the slot configuration information detected from the GC-PDCCH indicates that the first symbol set is flexible, transmission of the periodic signal in the first slot is skipped.

[0020] In the third and fourth aspects, the periodic signal is transmitted from the first slot only if slot configuration information detected from the GC-PDCCH indicates the first symbol set as an UL symbol.

[0021] In the third and fourth aspects, the PDCCH includes a US-PDCCH having uplink scheduling information, and when the first symbol set in the first slot is designated as flexible symbols by an upper layer, if an UL signal is scheduled in the first symbol set by the US-PDCCH, the periodic signal is transmitted in the first slot. Effect of the Invention

[0022] According to the present invention, information regarding the slot configuration can be efficiently notified to a terminal, and signals can be efficiently transmitted and received between a base station and a terminal according to the slot configuration.

[0023] The effects obtained by the present invention are not limited to those described above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is a diagram illustrating an example of a radio frame structure used in a wireless communication system. [Diagram 2] 1 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Diagram 3] A diagram to explain the physical channels used in the 3GPP system and a general signal transmission method using the physical channels. [Figure 4] FIG. 1 is a diagram of an SS / PBCH block for initial cell connection in a 3GPP NR system. [Diagram 5] A diagram showing a CORESET (control resource set) in which a PDCCH is transmitted in a 3GPP NR system. [Figure 6] FIG. 1 is a conceptual diagram explaining carrier aggregation. [Figure 7] FIG. 1 is a diagram for explaining single carrier communication and multi-carrier communication. [Figure 8] A diagram showing an example in which a cross-carrier scheduling technique is applied. [Figure 9] 13A is a diagram relating to a control information transmission procedure in LTE(-A), and FIG. 13B is a diagram relating to CCE aggregation of PDCCH and multiplexing of PDCCH. [Figure 10] A diagram showing search space allocation per CCE aggregation for a common search space and a UE specific (or Terminal specific) search space. [Figure 11] FIG. 1 is a diagram showing possible slot configurations for time division multiple access. [Figure 12] FIG. 1 is a diagram showing possible slot configurations for time division multiple access. [Figure 13] 1 is a diagram showing a case where multiple slot configurations are signaled in a group common (GC) PDCCH in time division multiple access. [Figure 14] FIG. 1 is a block diagram showing a slot configuration for scheduling in a UE-specific PDCCH that conveys scheduling information in time division multiple access. [Figure 15] This figure shows that a user scheduled for DL-only in one embodiment of the present invention knows the slot configuration using a group-common PCDDH of the scheduled slot in order to check whether the immediately following slot is UL-only. [Figure 16] This figure shows that a user scheduled for DL-only in one embodiment of the present invention knows the slot configuration by using the previous group common PCDDH closest to the scheduled slot to check whether the immediately following slot is UL-only. [Figure 17] This figure shows that a user scheduled in UL-only in one embodiment of the present invention knows the slot configuration by using a group common PCDDH of the slot immediately preceding the scheduled slot to determine whether the immediately preceding slot is DL-only. [Figure 18] This figure shows that a user scheduled for UL-only in one embodiment of the present invention knows the slot configuration by using the previous group common PCDDH closest to the scheduled slot to check whether the previous slot is DL-only. [Figure 19] FIG. 11 is a diagram relating to determining the slot configuration of a scheduled terminal. [Figure 20]1 is a block diagram showing a process for determining a scheduled slot structure using a group-common PDCCH for scheduled slots in cross-slot scheduling according to an embodiment of the present invention. FIG. [Figure 21] FIG. 13 is a block diagram illustrating a process for determining a scheduled slot structure using a previous group common PCDDH closest to a scheduled slot during cross-slot scheduling according to an embodiment of the present invention. [Figure 22] FIG. 11 is a diagram relating to determining a slot configuration when a terminal that periodically transmits and receives signals does not have scheduling information. [Figure 23] FIG. 11 is a diagram relating to determining a slot configuration when a terminal that periodically transmits and receives signals has scheduling information. [Figure 24] 4 is a block diagram showing a procedure for acquiring slot configuration information according to one embodiment of the present invention. [Diagram 25] A block diagram showing a procedure for receiving a PDCCH including slot configuration information according to one embodiment of the present invention. [Figure 26] A diagram showing a case where a base station and a terminal use different slot configurations in time division multiple access. [Figure 27] A diagram relating to changing a CORESET for monitoring a group common PDCCH according to one embodiment of the present invention. [Figure 28] 2 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The terms used in this specification are selected as common terms currently widely used as much as possible in consideration of the functions in the present invention, but this may vary depending on the intentions, customs, or the emergence of new technologies of the engineers in this field. In addition, in certain cases, the applicant may arbitrarily select some terms, and in this case, the meaning will be described in the description of the relevant invention. Therefore, it is clear that the terms used in this specification should be analyzed based on the substantial meaning of the terms and the contents of this specification as a whole, rather than simply the names of the terms.

[0026] Throughout the specification, when a certain component is "connected" to another component, this includes not only "direct connection" but also "electrical connection" through other components in between. Furthermore, when a certain component is "included" in a certain component, this does not mean excluding other components, but further includes other components, unless otherwise specified to the contrary. In addition, limitations such as "more than" or "less than" based on a specific threshold may be appropriately replaced with "more than" or "less than", respectively, depending on the embodiment.

[0027] The following technologies are 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 frequency division multiple access (SC-FDMA), etc. CDMA is implemented in radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA is implemented in radio technologies such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rates for GSM Evolution (EDGE). OFDMA is implemented in radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, Evolved UTRA (E-UTRA), etc. UTRA is a part of the Universal Mobile Telecommunication System (UMTS). 3GPP LTE (Long term evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A, and is a system for supporting eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. For clarity of explanation, the following description will focus on 3GPP NR, but the technical idea of ​​the present invention is not limited thereto.

[0028] In this specification, unless otherwise specified, a base station refers to a gNB (next generation node B) defined in 3GPP NR. Also, unless otherwise specified, a terminal refers to a UE (user equipment).

[0029] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a wireless communication system.

[0030] Referring to FIG. 1, the radio frame used in the 3GPP NR system is 10 ms (Δf max N f / 100)*T c ) and the radio frame consists of 10 equally sized subframes (SF). Here, Δf max =480*10 3 HZ, N f =4096, T c =1 / (Δf ref *N f、ref ), Δf ref =15*10 3 Hz, N f、ref = 2048. The 10 subframes in one radio frame are numbered from 0 to 9. Each subframe has a length of 1 ms and consists of one or more slots depending on the subcarrier spacing. More specifically, the subcarrier spacing that can be used in the 3GPP NR system is 15*2 μ kHz, and μ is a subcarrier spacing configuration factor, μ=0, 1, 2, 3, 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz are used as the subcarrier spacing. One subframe having a length of 1 ms is 2 μ slots, each of which is 2 -μ ms. μ The slots range from 0 to 2μ The slots in one subframe are numbered from 0 to 10*2. μ The time resources are numbered from -1 to -1. The time resources are divided by at least one of a radio frame number (or a radio frame index), a subframe number (or a subframe number), and a slot number (or a slot index).

[0031] 2 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system, in particular, a resource grid structure of a 3GPP NR system.

[0032] There is one resource grid per antenna port. Referring to FIG. 2, a slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol may mean one symbol period. Unless otherwise specified, an OFDM symbol may simply be referred to as a symbol. Referring to FIG. 2, a signal transmitted from each slot is N size、μ grid、x *N RB SC subcarriers and N slot Symb It is represented by a resource lattice consisting of OFDM symbols, where x=DL for the downlink resource lattice and x=UL for the uplink resource lattice. size、μ grid、x indicates the number of resource blocks (RBs) depending on the subcarrier spacing factor μ (downlink or uplink depending on x), and N slot Symb N denotes the number of OFDM symbols in a slot. RB SC is the number of subcarriers that make up one RB, and N RB SC= 12. Depending on the multiple access method, the OFDM symbol is called a cyclic shift OFDM (CP-OFDM) symbol or a Discrete Fourier transform spreading OFDM (DFT-s-OFDM) symbol. The number of OFDM symbols included in one slot may vary depending on the length of the cyclic prefix (CP). For example, in a normal CP, one slot includes 14 OFDM symbols, while in an extended CP, one slot includes 12 OFDM symbols. In a specific embodiment, the extended CP is used only with a subcarrier spacing of 60 kHz. For convenience of explanation, FIG. 2 illustrates a slot consisting of 14 OFDM symbols, but the embodiment of the present invention is also applicable to slots having a different number of OFDM symbols in the same manner. Referring to FIG. 2, each OFDM symbol is represented by N size、μ grid、x *N RB SC The subcarriers are classified into data subcarriers for transmitting data, reference signal subcarriers for transmitting a reference signal, and guard bands. The carrier frequency is also called the center frequency.

[0033] RB is N in the time domain. slot Symb is defined as N (e.g., 14) consecutive OFDM symbols in the frequency domain. RB SC A RB is defined by N (e.g., 12) consecutive subcarriers. Incidentally, a resource consisting of one OFDM symbol and one subcarrier is called a Resource Element (RE) or a tone. Therefore, one RB is N slot Symb *N RB SCEach resource element in the resource lattice is uniquely defined by an index pair (k, l) within one slot, where k runs from 0 to N in the frequency domain. size、μ grid、x *N RB SC is an index given from -1 to l in the time domain from 0 to N slot Symb This is an index up to -1.

[0034] Meanwhile, one RB is mapped to one physical resource block (PRB) and one virtual resource block (VRB). A PRB is N slot Symb A PRB is defined as N consecutive OFDM symbols (e.g., 14 symbols) in the frequency domain. RB SC A PRB is defined by N (e.g., 12) consecutive subcarriers. RB SC *N slot Symb It consists of resource elements.

[0035] In order for a terminal to receive a signal from a base station or transmit a signal to a base station, the time / frequency synchronization of the terminal should be aligned with the time / frequency synchronization of the base station, because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters required to demodulate DL signals and transmit UL signals at the correct time.

[0036] FIG. 3 is a diagram for explaining a physical channel used in a 3GPP system (e.g., NR) and a general signal transmission method using the physical channel. When a terminal is powered on or newly enters a cell, the terminal performs an initial cell search (S301). More specifically, the terminal synchronizes with a base station through the initial cell search. To this end, the terminal receives a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) from the base station to synchronize with the base station and acquire information such as a cell ID. Then, the terminal receives a Physical Broadcast Channel from the base station to acquire broadcast information within the cell. After completing the initial cell search, the terminal receives a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) according to the information carried on the PDCCH to acquire more specific system information than the system information acquired through the initial cell search (S302). When the terminal first connects to the base station or there is no radio resource for transmitting a signal, the terminal performs a random access procedure to the base station (S303 to S306). To this end, the terminal transmits a specific sequence to a preamble via a physical random access channel (PRACH) (S303 to S305) and receives a response message to the preamble from the base station via a PDCCH and a corresponding PDSCH (S304 and S306). In the case of a contention-based RACH, a contention resolution procedure is additionally performed. After the above procedures, the terminal receives a PDCCH / PDSCH (S307) and transmits a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) as a general uplink / downlink signal transmission procedure (S308).In particular, the terminal receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the terminal. The format of the DCI may vary depending on the purpose of use of the DCI. Control information that the terminal transmits to the base station via the uplink or that the terminal receives from the base station includes downlink / uplink ACK / NACK signals, a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), etc. In the case of a 3GPP NR system, the terminal transmits control information such as the above-mentioned HARQ-ACK and CSI via the PUSCH and / or PUCCH.

[0037] FIG. 4 is a diagram of an SS / PBCH block for initial cell connection in a 3GPP NR system.

[0038] When a terminal is powered on or attempts to connect to a new cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. In the cell search process, the terminal obtains the physical cell identity N cell IDIn order to do so, the terminal receives a synchronization signal, for example, a PSS and a subsynchronization signal SSS from the base station and synchronizes with the base station. At this time, the terminal acquires information such as a cell identity (ID). The synchronization signal will be described in more detail with reference to FIG. 4(a). The synchronization signal is divided into a PSS and an SSS. The PSS is used to obtain time domain synchronization such as OFDM symbol synchronization, slot synchronization, and / or frequency domain synchronization. The SSS is used to obtain frame synchronization and a cell group ID. Referring to FIG. 4(a) and Table 1, the SS / PBCH block is composed of 20 RBs (=240 subcarriers) on the frequency axis and 4 OFDM symbols on the time axis. Here, in the SS / PBCH block, the first OFDM symbol, the SSS, is transmitted from subcarriers 56, 57, ... 182 in the third OFDM symbol. Here, the lowest subcarrier index of the SS / PBCH block is numbered starting from 0. In the first OFDM symbol transmitted by the PSS, the base station does not transmit signals on the remaining subcarriers, i.e., subcarriers 0, 1, . . . 55, 183, 184, . . . 239. In the third OFDM symbol transmitted by the SSS, the base station does not transmit signals on subcarriers 48, 49, . . . 55, 183, 184, . . . 191. The base station transmits PBCH signals on the remaining REs in the SS / PBCH block excluding the above signals.

[0039] [Table 1]

[0040] The SS indicates a total of 1008 unique physical layer cell IDs through a combination of three PSSs and 336 SSs. In particular, the physical layer cell IDs are grouped into 336 physical layer cell ID groups, each group including three unique identifiers, such that each physical layer cell ID is part of only one physical layer cell ID group. Thus, the physical layer cell ID N cellID =3N (1) ID +N (2) ID is a number in the range from 0 to 335 that indicates a physical-layer cell-identifier group. (1) ID and a number N from 0 to 2 indicating said physical-layer cell-identifier within a physical-layer cell-identifier group. (2) ID The PSS is uniquely defined by the following: The terminal detects the PSS and identifies one of three unique physical-layer cell-identifiers. The terminal also detects the SSS and identifies one of 336 physical layer cell IDs related to the physical-layer cell-identifier. The PSS signal is as follows:

[0041]

number

[0042] Where:

[0043]

number

[0044] and

[0045]

number

[0046] The SSS is given by:

[0047]

number

[0048] Where:

[0049]

number

[0050] and

[0051]

number

[0052] is given by:

[0053] A radio frame having a duration of 10 ms is divided into two half frames having a duration of 5 ms. The slots in each half frame in which the SS / PBCH block is transmitted are described with reference to FIG. 4(b). The slots in which the SS / PBCH block is transmitted are any one of Cases A, B, C, D, and E. In Case A, the subcarrier spacing is 15 kHz, and the start point of the SS / PBCH block is {2, 8}+14*n symbols. In this case, n=0, 1 for carrier frequencies below 3 GHz. In the range from 3 GHz to 6 GHz, n=0, 1, 2, 3. In Case B, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is {4, 8, 16, 20}+28*n. In this case, n=1 for carrier frequencies below 3 GHz. In the range from 3 GHz to 6 GHz, n=0, 1. In case C, the subcarrier spacing is 30 kHz and the start point of the SS / PBCH block is {2, 8}+14*n, where n=0, 1 for carrier frequencies below 3 GHz. For frequencies above 3 GHz and below 6 GHz, n=0, 1, 2, 3. In case D, the subcarrier spacing is 120 kHz and the start point of the SS / PBCH block is {4, 8, 16, 20}+28*n, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 for carrier frequencies above 6 GHz. In case E, the subcarrier spacing is 240 kHz and the start point of the SS / PBCH block is {8, 12, 16, 20, 32, 36, 40, 44}+56*n. In this case, n=0, 1, 2, 3, 5, 6, 7, 8 for carrier frequencies of 6 GHz or higher.

[0054] FIG. 5 relates to a procedure for transmitting control information and a control channel in a 3GPP NR system. Referring to FIG. 5(a), a base station adds a CRC (Cyclic Redundancy Check) masked (e.g., XORed) with a Radio Network Temporary Identifier (RNTI) to control information (e.g., DCI) (S502). The base station scrambles the CRC with an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more terminals includes at least one of a System Information RNTI (SI-RNTI), a Paging RNTI (P-RNTI), a Random Access RNTI (RA-RNTI), and a Transit Power Control RNTI (TPC-RNTI). In addition, the terminal-specific RNTI includes at least one of a Cell temporary RNTI (C-RNTI) and an SPS Semi-Persistent Scheduling C-RNTI. Next, the base station performs channel coding (e.g., polar coding) (S504), and then performs rate matching according to the amount of resource(s) used for PDCCH transmission (S506). Next, the base station multiplexes DCI(s) based on a PDCCH structure based on CCE (Control Channel Element) (S508), applies an additional process (e.g., scrambling, modulation (e.g., QPSK), interlink) (S910) to the multiplexed DCI(s), and then maps it to the resource to be transmitted. A CCE is a basic resource unit for PDCCH, and one CCE consists of a plurality of (e.g., 6) REGs (Resource Element Groups). One REG consists of a plurality of (e.g., 12) REs. The number of CCEs used for one PDCCH is defined as an aggregation level. In the 3GPP NR system, 1, 2, 4, 8, and 16 are used.FIG. 5(b) is a diagram relating to CCE aggregation levels and PDCCH multiplexing, showing the types of CCE aggregation levels used for one PDCCH and the CCE(s) transmitted from the control area accordingly.

[0055] FIG. 6 is a diagram showing a CORESET in which a PDCCH is transmitted in a 3GPP NR system.

[0056] CORESET is a time-frequency resource in which PDCCH, which is a control signal for a terminal, is transmitted. Referring to FIG. 6, a terminal does not receive all frequency bands and attempt to decode PDCCH, but receives only time-frequency resources defined as CORESET and decodes PDCCH mapped in CORESET. A base station configures one or more CORESETs for each cell in a terminal. A CORESET is composed of up to three consecutive symbols on the time axis. Also, a CORESET is configured consecutively or discontinuously in units of 6 PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET#1 is composed of consecutive PRBs, and CORESET#2 and CORESET#3 are composed of discontinuous PRBs. A CORESET may be located at any symbol in a slot. For example, CORESET#1 in FIG. 5 starts from the first symbol of a slot, CORESET#2 starts from the fifth symbol of a slot, and CORESET#9 starts from the ninth symbol of a slot.

[0057] FIG. 7 is a diagram related to the setting of a PDCCH search space in a 3GPP NR system. In order to transmit a PDCCH to a terminal, at least one search space exists in each CORESET. In the present invention, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) in which the PDCCH of the terminal can be transmitted. The search space includes a common search space that 3GPP NR terminals should commonly search, and a terminal-specific or UE-specific search space that a specific terminal should search. The common search space is set to monitor a PDCCH that is set to be commonly searched by all terminals in a cell belonging to the same base station, and the terminal-specific search space is set for each terminal to monitor a PDCCH assigned to each terminal at different search space positions according to the terminal. The terminal-specific search space may be assigned with a partial overlap between terminal search spaces due to a limited control region that may be assigned to the PDCCH. Monitoring the PDCCH includes blind decoding PDCCH candidates in the search space. If the blind decoding is successful, the PDCCH is said to be (successfully) detected / received, and if the blind decoding is unsuccessful, the PDCCH is said to be undetected / unreceived or not successfully detected / received.

[0058] For ease of explanation, a PDCCH scrambled with a group common (GC) RNTI (or common control RNTI, CC-RNTI) already known to transmit uplink scheduling information or downlink scheduling information to one or more terminals is referred to as a (UE) group common (GC) PDCCH or a common PDCCH. Also, a PDCCH scrambled with a terminal-specific RNTI already known by a specific terminal to transmit uplink scheduling information or downlink scheduling information to one specific terminal is referred to as a user-specific (US) PDCCH.

[0059] The PDCCH informs each terminal or a terminal group of at least one of information on resource allocation (DL Grant) of the transmission channels PCH (Paging channel) and DL-SCH (Downlink-shared channel), resource allocation (Uplink Grant) of the UL-SCH, and HARQ information. The base station transmits PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station transmits data excluding specific control information or specific service data via the PDSCH. In addition, the terminal receives data excluding specific control information or specific service data via the PDSCH.

[0060] The base station transmits information about which terminal (one or more terminals) the PDSCH data is transmitted to and how the corresponding terminal should receive and decode the PDSCH by including it in the PDCCH. For example, assume that a specific PDCCH is CRC masked with RNTI "A", and information about data to be transmitted using radio resource "B" (e.g., frequency location) and DCI format "C", i.e., transmission format information (e.g., transmission block size, modulation method, coding information), is transmitted through a specific subframe. In this case, a terminal in a cell monitors the PDCCH using its own RNTI information, and if there is one or more terminals with RNTI "A", the corresponding terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the received PDCCH information.

[0061] Table 2 relates to a physical uplink control channel (PUCCH) used in a wireless communication system.

[0062] [Table 2]

[0063] The PUCCH is used to transmit the following control information: -SR (Scheduling Request): Information used to request uplink UL-SCH resources. -HARQ-ACK: A response to a PDCCH (indicating DL SPS release) and / or a response to a downlink data packet on a PDSCH. It indicates whether the PDCCH or PDSCH has been successfully received. The HARQ-ACK response includes a positive ACK (simply ACK), a negative ACK (hereinafter, NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK. In general, ACK is expressed as 1, and NACK is expressed as 0. -CSI (Channel State Information): Feedback information for a downlink channel. It is generated by a terminal based on CSI-RS (Reference Signal) transmitted by a base station. MIMO (Multiple Input Multiple Output)-related feedback information includes RI (Rank Indicator) and PMI (Precoding Matrix Indicator). CSI is divided into CSI part 1 and CSI part 2 according to the information indicated by CSI.

[0064] In the 3GPP NR system, five PUCCH formats are used to support various service scenarios, various channel environments, and frame structures.

[0065] PUCCH format0 is a format that carries 1 or 2 bits of HARQ-ACK information. PUCCH format0 is transmitted using 1 or 2 OFDM symbols on the time axis and 1 PRB on the frequency axis. If PUCCH format0 is transmitted using 2 OFDM symbols, the same sequence is transmitted using different PRBs for two symbols. Through this, the terminal obtains frequency diversity gain. More specifically, the terminal bit bits UCI(M bit=1 or 2) to determine the cyclic shift value m cs Determine the base sequence of length 12 and set it to a given value m cs The sequence cyclically shifted by is mapped to 12REs of 1 PRB of 1 OFDM symbol and transmitted. The number of cyclic shifts available to the terminal is 12, and M bit If M = 1, when the terminal transmits UCI0 and UCI1, the terminal sets the difference between the two cyclic shift values ​​to 6. bit If = 2 and the terminal transmits UCI00, UCI01, UCI11, and UCI10, the terminal sets the difference between the four cyclic shift values ​​to 3.

[0066] PUCCH format1 carries 1-bit or 2-bit HARQ-ACK information. PUCCH format1 is transmitted in consecutive OFDM symbols on the time axis and in one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format1 is one of 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14. bit =1 UCI is BPSK modulated. bit =2 UCI is modulated with quadrature phase shift keying (QPSK) to generate complex valued symbol d(0), which is then multiplied with a sequence of length 12 to obtain a signal. The terminal transmits the resulting signal by spreading it with a time-domain orthogonal cover code (OCC) on the even-numbered OFDM symbol to which PUCCH format1 is assigned. For PUCCH format1, the maximum number of different terminals that can be multiplexed onto the same PRB is determined according to the length of the OCC used. The Demodulation RS (DMRS) is spread onto the OCC and mapped onto the resulting OFDM symbol of PUCCH format1.

[0067] PUCCH format 2 transmits UCI (Uplink Control Information) exceeding 2 bits. PUCCH format 2 is transmitted with one or two OFDM symbols on the time axis and one PRB on the frequency axis. If PUCCH format 2 is transmitted with two OFDM symbols, the same sequence is transmitted with different PRBs through the two OFDM symbols. Through this, the terminal obtains frequency diversity gain. bit bits UCI(M bit >2) is bit-level scrambled, QPSK modulated and mapped to the PRB(s) of the OFDM symbol, where the number of PRBs is one of 1, 2,...,16.

[0068] PUCCH format 3 or PUCCH format 4 carries UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted via consecutive OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is one of 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14. bit bits UCI(M bit >2) with π / 2-BPSK (Binary Phase Keying) or QPSK to generate complex symbols d(0), , d(M symb The terminal generates a PUCCH format 3 subcarrier (1RB-1-1) for PUCCH format 3. The terminal does not apply block-wise spreading to PUCCH format 3. However, the terminal applies block-wise spreading to 1 RB (12 subcarriers) using PreDFT-OCC of length-12 so that PUCCH format 4 has a multiplexing capacity of 2 or 4. The terminal performs transmit precoding (or DFT-precoding) on ​​the spread signal, maps it to each RE, and transmits the spread signal.

[0069] In this case, the number of PRBs occupied by PUCCH format2, PUCCH format3, or PUCCH format4 is determined according to the length of UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format2, the terminal transmits both HARQ-ACK information and CSI information via PUCCH. If the number of PRBs that the terminal can transmit is greater than the maximum number of PRBs that PUCCH format2, PUCCH format3, or PUCCH format4 can use, the terminal does not transmit some UCI information according to the priority of the UCI information and transmits only the remaining UCI information.

[0070] PUCCH format1, PUCCH format3, or PUCCH format4 is configured via RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, the PRB index for frequency hopping is configured via RRC signaling. If PUCCH format1, PUCCH format3, or PUCCH format4 is transmitted over Nth OFDM symbol on the time axis, the first hop has floor(N / 2) OFDM symbols and the second hop has ceiling(N / 2) OFDM symbols.

[0071] PUCCH format1, PUCCH format3, or PUCCH format4 is configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted is configured by an RRC signal. The repeatedly transmitted PUCCH should start from the same OFDM symbol position in each slot and have the same length. If the RRC signal indicates that another OFDM symbol in the slot in which the UE should transmit the PUCCH is a DL symbol, the UE does not transmit the PUCCH in the corresponding slot, but extends it to the next slot for transmission.

[0072] In the 3GPP NR system, the terminal performs transmission and reception using a bandwidth smaller than or equal to the bandwidth of the carrier (or cell). Therefore, the terminal constitutes a Bandwidth part (BWP) consisting of a part of the continuous bandwidth within the carrier bandwidth. A terminal operating by TDD or operating in an unpaired spectrum constitutes up to 4 DL / UL BWP pairs for one carrier (or cell). Also, the terminal activates one DL / UL BWP pair. A terminal operating by FDD or operating in a paired spectrum constitutes up to 4 DL BWPs for the downlink carrier (or cell) and up to 4 UL BWPs for the uplink carrier (or cell). The terminal activates one DL BWP and one UL BWP for each carrier (or cell). The terminal does not receive or attempt to receive on time-frequency resources other than the activated BWP. The activated BWP is referred to as the active BWP.

[0073] The base station uses DCI to indicate that the terminal moves from one BWP to another BWP. The terminal moves from one BWP to another BWP, which indicates that the terminal deactivates the BWP used by the terminal and activates a new BWP. In a carrier (or cell) operating in TDD, the base station includes a BPI (Bandwidth part indicator) indicating the activated BWP in DCI for scheduling PDSCH or PUSCH to change the DL / UL BWP pair of the terminal. The terminal receives the DCI for scheduling PDSCH or PUSCH and identifies the activated DL / UL BWP pair based on the BPI. In the case of a downlink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in DCI for scheduling PDSCH to change the DL BWP of the terminal. In the case of an uplink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in DCI for scheduling PDSCH to change the UL BWP of the terminal.

[0074] The carrier aggregation technique will be described below. Figure 6 is a conceptual diagram illustrating carrier aggregation.

[0075] Carrier aggregation refers to a method in which a terminal uses multiple frequency blocks or (logical) cells consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers) as one large logical frequency band in order for a wireless communication system to use a wider frequency band. Hereinafter, for convenience of explanation, the term "component carrier" will be used.

[0076] Referring to FIG. 8, as an example of a 3GPP NR system, the entire system band includes a maximum of 16 component carriers, each of which has a maximum bandwidth of 400 MHz. The component carrier includes one or more physically contiguous subcarriers. Although FIG. 8 shows each component carrier having the same bandwidth, this is merely an example, and each component carrier may have a different bandwidth. Also, although each component carrier is shown adjacent to each other on the frequency axis, the figure is shown in a logical external view, and each component carrier may be physically adjacent to each other or separated from each other.

[0077] A different center carrier (conter frequency) is used in each component carrier. Also, a common center carrier is used in physically adjacent component carriers. In the embodiment of FIG. 8, if it is assumed that all component carriers are physically adjacent, center carrier A is used for all component carriers. Also, if it is assumed that each component carrier is not physically adjacent, center carrier A and center carrier B are used for each component carrier.

[0078] If the entire system bandwidth is expanded by carrier aggregation, the frequency band used for communication with each terminal is defined on a component carrier basis. Terminal A can use the entire system bandwidth of 100 MHz, and communicates using all five component carriers. Terminal B 1 ~B 5 Terminal C can only use a 20 MHz bandwidth and communicates using one component carrier. 1 and C 2 Terminal C can only use 40 MHz bandwidth and communicates using two component carriers each. The two component carriers may or may not be logically / physically adjacent. 1indicates the case where two non-adjacent component carriers are used, and terminal C 2 indicates the case where two adjacent component carriers are used.

[0079] 9 is a diagram for explaining single carrier communication and multi-carrier communication. In particular, FIG. 9(a) shows a subframe structure of a terminal carrier, and FIG. 9(b) shows a subframe structure of a multi-carrier.

[0080] Referring to FIG. 9(a), a general wireless communication system transmits or receives data through one DL band and one corresponding UL band (in the case of frequency division duplex (FDD) mode). In another specific embodiment, the wireless communication system divides a radio frame into an uplink time unit and a downlink time unit in the time domain, and transmits or receives data through the uplink / downlink time unit (in the case of time division duplex (TDD) mode). Referring to FIG. 9(b), three 20 MHz CCs are aggregated in each of the UL and DL to support a bandwidth of 60 MHz. The respective CCs are adjacent or non-adjacent to each other in the frequency domain. Although FIG. 9(b) illustrates a case in which the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetrical for convenience, the bandwidth of each CC may be determined independently. Also, asymmetric carrier aggregation in which the number of UL CCs and the number of DL CCs are different is possible. A DL / UL CC assigned to a specific UE via RRC is called a configured serving UL / DL CC in a specific UL.

[0081] The base station activates some or all of the serving CCs configured in the terminal, or deactivates some of the CCs to be used for communication with the terminal. The base station changes the CCs to be activated / deactivated and the number of CCs to be activated / deactivated. When the base station allocates CCs available to the terminal to cell-specific or terminal-specific, at least one of the CCs once allocated is not deactivated unless the CC allocation to the terminal is completely reconfigured or the terminal is handed over. A CC that is not deactivated by the terminal is called a Primary CC (PCC), and a CC that the base station activates / deactivates freely is called a Secondary CC (SCC). PCCs and SCCs may be distinguished based on control information. For example, specific control information is set to be transmitted and received only through a specific CC, and such a specific CC may be called a PCC and the remaining CC(s) may be called SCC(s).

[0082] Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of downlink resources (DL resources) and uplink resources (UL resources), i.e., a combination of DL CC and UL CC. A cell consists of DL resources alone or a combination of DL resources and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of DL resources (or DL ​​CC) and the carrier frequency of UL resources (or UL CC) is indicated by system information. For a UE in RRC_CONNECTED state but with no carrier aggregation configured or that does not support carrier aggregation, there is only one serving cell configured with only a PCell.

[0083] As described above, the term cell used in carrier aggregation is distinguished from the term cell indicating a certain geographical area to which communication services are provided by one base station or one antenna group. In order to distinguish between a cell indicating a certain geographical area and a cell of carrier aggregation, in the present invention, a cell of carrier aggregation is referred to as CC, and a cell of a geographical area is referred to as cell.

[0084] Figure 10 is a diagram showing an example in which the cross-carrier scheduling technique is applied. In particular, in Figure 10, the number of allocated cells (or component carriers) is three, and the cross-carrier scheduling technique is performed using the CIF as described above. Here, it is assumed that the downlink cell #0 is a downlink primary component carrier (i.e., Primary Cell, PCell), and the remaining component carriers #1 and #2 are secondary component carriers (i.e., Secondary Cell, SCell).

[0085] The present invention proposes an effective management method of uplink resources for a primary component carrier (or Primary Cell or PCell) or a secondary component carrier (or SCell) during carrier aggregation operation of a terminal. In the following, a case where a terminal operates by aggregating two component carriers will be described, but it is obvious that the method can also be applied to a case where three or more component carriers are aggregated.

[0086] 9 and 10 are mainly illustrated with respect to the subframe structure of the 3GPP LTE-A system, but are also applicable to the 3GPP NR system. In the 3GPP NR system, the subframes in FIG. 9 and FIG. 10 may be replaced with slots.

[0087] The present invention will be described below. For the sake of helping understanding of the description, each content will be separately described in examples, but each example may be used in combination with each other.

[0088] Example 1: Configuration of Slot and Signaling Therefor FIGS. 11 to 12 show an example of slot configuration in a mobile communication system using TDD.

[0089] In the 3GPP NR system, the base station flexibly changes the slot configuration according to the user's traffic, and configures the information on the slot configuration (simply, slot - format information) (SFI) for the terminal as an RRC signal, or indicates it in an L1 (Layer 1) (e.g., PDCCH) signal. Here, the information on the slot configuration indicates the configuration information regarding the symbols in the slot. Here, a symbol means an OFDM symbol, and the OFDM symbol includes a CP - OFDM symbol or a DFT - s - OFDM symbol (or, an SC - FDM(A) symbol). Referring to FIGS. 11 to 12, each symbol in the slot is composed of one of a downlink (DL) symbol, an uplink (UL) symbol, and an Unknown symbol. Here, the Unknown symbol means a symbol that is neither a DL symbol nor a UL symbol, and the usage, transmission direction, or symbol type (e.g., DL, UL, X) is changed (here, X indicates Unknown). For example, the Unknown symbol is a symbol that is neither a DL symbol nor a UL symbol, and may be changed to a DL symbol, a UL symbol, or an Unknown symbol. Some / all of the Unknown symbols in the slot are used as a gap (gqp) for DL - UL switching, or used for other purposes other than the gap. The Unknown symbol may be expressed as a Flexible symbol, and in the present invention, the Flexible symbol and the Unknown symbol are used interchangeably.

[0090] Referring to FIG. 11, a slot includes a plurality of symbols, each of which is a DL symbol, an unknown symbol, and a UL symbol. Although a slot includes 14 symbols as shown in FIG. 2, the number of symbols is assumed to be 7 for convenience of explanation. The unknown in FIG. 11 is understood as a symbol for ensuring a DL-UL switching gap. In the case of FIG. 11, eight slot formats are defined. Slot format 0 includes all downlink OFDM symbols. Slot format 1 includes six downlink symbols and one unknown symbol. Slot format 2 includes five downlink symbols, one unknown symbol, and one uplink symbol. Slot format 3 includes four downlink symbols, one unknown symbol, and two uplink symbols. Slot format 4 includes three downlink symbols, one unknown symbol, and three uplink symbols. Slot format 5 includes two downlink symbols, one unknown symbol, and four uplink symbols. Slot configuration 6 consists of one downlink symbol, one unknown symbol, and five uplink symbols. Slot configuration 7 consists of seven uplink symbols. For convenience of explanation in this invention, slot configuration 0 is called DL-only slot, and slot configuration 7 is called UL-only slot. The slot structure in FIG. 11 is used by expanding it to a slot consisting of 12 or 14 OFDM symbols. In addition, in the slot structure in FIG. 11, one slot includes one or more unknown symbols.

[0091] Hereinafter, a method in which the base station informs the terminal of slot configuration information based on the slot structure of FIG. 12 will be described.

[0092] As a first method of notifying the UE of slot configuration information, the base station notifies the UE of semi-static DL / UL allocation information. Here, the semi-static DL / UL allocation information includes information on DL / UL configuration within a slot, and is called semi-static slot-format information (semi-static SFI). The base station transmits the semi-static DL / UL allocation information (or semi-static SFI) cell-specifically (e.g., in a system information block' transmission or cell-specific RRC information transmission) or through a UE-specific RRC signal. After receiving the semi-static DL / UL allocation information (or semi-static SFI), the UE can later know what slot configuration the slot(s) have. The semi-static SFI includes slot configuration information for a slot set corresponding to a slot configuration period, and the slot configuration information is repeatedly applied in slot set units. The semi-static DL / UL allocation information (or semi-static SFI) includes information on the slot configuration, for example, information on whether each symbol in the slot is a downlink symbol (hereinafter, DL), an uplink symbol (hereinafter, UL), or an unknown symbol that is neither a downlink symbol nor an uplink symbol. Incidentally, the terminal assumes that "Unknown" is specified for a symbol for which semi-static DL / UL allocation information (or semi-static SFI) is not specified.

[0093] As an embodiment of the present invention, as a method of signaling semi-static DL / UL allocation information (or semi-static SFI), the base station and the terminal always assume that a slot has a DL symbol, an unknown symbol, and a UL symbol in that order, and the number of DL symbols in each slot, N DL The terminal notifies the number of unknown symbols in that slot, N Unknown The terminal knows the number of UL symbols in that slot as max(0, N symbol -N DL -N Unknown ) where N symbolis the total number of symbols included in one slot, and max(x, y) is a function that returns the larger value of x and y. The number of unknown symbols configured through the other RRC signal is the same as the number of symbols corresponding to the GAP for DL-UL switching of the UE. In this case, if the number of bits required to indicate semi-static DL / UL allocation information (or semi-static SFI) of one slot in the above method is K, then N symbol = 14, N DL can have one of the values ​​0, 1, ..., 14, so K = 4 is possible.

[0094] As an embodiment of the present invention, as another method of signaling semi-static DL / UL allocation information (or semi-static SFI), the base station and the terminal always assume that a slot has a DL symbol, an unknown symbol, and a UL symbol in that order, and the number of DL symbols in each slot, N DL and the number of unknown symbols, N Unknown The terminal informs the user that the number of UL symbols in that slot is max(0,N symbol -N DL -N Unknown ) where N symbol is the total number of symbols contained in one slot, and max(x, y) is a function that returns the larger value of x and y. Unknown Assuming that the number of bits required to indicate the semi-static DL / UL allocation information (or semi-static SFI) of one slot in the above method is K, then N symbol = 14, N DL Four bits are needed to indicate the possible values ​​of 0, 1, ..., 14, and two N Unknown Since one bit is needed to indicate the value, K=5 can be used.

[0095] As an embodiment of the present invention, as another method of signaling semi-static DL / UL allocation information (or semi-static SFI), the base station and the terminal always assume that a slot has a DL symbol, an unknown symbol, and a UL symbol in that order, and the number of DL symbols in each slot, N DL and the number of UL symbols, N UL The terminal informs the user that the number of unknown symbols in that slot is max(0, N symbol -N DL -N UL ) where N symbol is the total number of symbols included in one slot, and max(x, y) is a function that returns the larger value of x and y. In the above method, if the number of bits required to indicate semi-static DL / UL allocation information (or semi-static SFI) of one slot is K, then N symbol = 14, N DL as 0, 1, . . . , 14, N UL Assuming we use 0, 1, ..., 14 as K, then K = 8.

[0096] As another method of signaling semi-static DL / UL allocation information (or semi-static SFI), the base station and the terminal always assume that a slot has the order of DL symbols, unknown symbols, and UL symbols, and inform X and Y, which correspond to the number of DL symbols and UL symbols. In addition, they further inform whether the slot format is UL-centric or DL-centric through one bit. Here, the range that X can have is larger than the range that Y can have. For example, X is X min ~N symbol where Y is a number between 0 and Y max where X min is greater than or equal to 0 and N symbol Preferably, X is greater than or equal to min = 7, where Y max is greater than or equal to 0 and X min It is smaller than or equal to Y. maxIf an additional bit indicates that the slot is DL-centric, N DL = X and N UL = Y. If an additional bit indicates that the slot is UL-centric, then N DL = Y and N UL =X. The terminal determines the number of unknown symbols in a slot as max(0, N symbol -N DL -N UL ) where N symbol is the total number of symbols included in one slot, and max(x, y) is a function that returns the larger value of x and y. In the above method, if the number of bits required to indicate semi-static DL / UL allocation information (or semi-static SFI) of one slot is K, then N symbol = 14, assume that X = 7, 8, 9, 10, 11, 12, 13, 14 and Y = 0, 1, 2, 3, 4, 5, 6, 7, then 3 bits are required for each, and 1 bit is required to determine whether it is a DL-carrier or a UL-carrier, so K = 7.

[0097] As another method of signaling semi-static DL / UL allocation information (or semi-static SFI) according to an embodiment of the present invention, the base station and the terminal always assume that a slot has a DL symbol, an unknown symbol, and a UL symbol in that order, and inform the base station and the terminal of the start position and length of the unknown symbols in a slot. symbol Let N start is the position of the OFDM symbol where the unknown symbol begins in the slot, L symbols Let be the number of consecutively allocated unknown symbols. Also, assume that the OFDM symbol position starts from 0. In one slot, the value for notifying information that an unknown symbol is allocated, the symbol indication value (SIV), is determined as follows:

[0098]

number

[0099] Here, floor(x) is a function that returns the largest integer that is smaller than or equal to x. Also, the SIV value ranges from 0 to N. symbol *(N symbol +1) / 2-1. For example, if a slot has 14 symbols, all of which are unknown symbols, then N start =0, L symbols = 14, so SIV = 27. If the unknown symbols are located in OFDM symbols 4, 5, and 6, N start =4, L symbols = 3, so SIV = 32. 0~N symbol *(N symbol SIV values ​​between 0x1 and 0x2 assume that there is at least one Unknown symbol in a slot and cannot indicate DL-only slots (i.e., slots where all symbols are DL symbols) and UL-only slots (i.e., slots where all symbols are UL symbols).

[0100] On the other hand, an additional value can be added to the SIV value to indicate that a slot is made up entirely of DL symbols or entirely of UL symbols. For example, to indicate a slot that is made up entirely of DL symbols, SIV=N symbol *(N symbol +1) / 2 to indicate a slot consisting entirely of UL symbols, and SIV=N symbol *(N symbol As another example, to indicate a slot consisting entirely of UL symbols, SIV=N symbol *(N symbol +1) / 2 to indicate a slot consisting entirely of DL symbols, and SIV=N symbol *(N symbol +1) / 2+1 may be specified. In this method, SIV is 0 to Nsymbol *(N symbol +1) / 2+1. Therefore, the number of bits required is ceil(log 2 (N symbol *(N symbol +1) / 2+2)) bits. Here, ceil(x) is a function that returns the smallest integer that is greater than or equal to x. Therefore, N symbol = 14 then 7 bits are needed.

[0101] On the other hand, 0 to N symbol *(N symbol Some SIV values ​​between (+1) / 2+1 are interpreted as indicating that a slot consists entirely of DL symbols. For example, an SIV value indicating that the first OFDM symbol of a slot is an Unknown symbol and the rest are all UL is interpreted as indicating a slot consisting entirely of UL symbols. Also, an SIV value indicating that the last OFDM symbol of a slot is Unknown and the rest are all DL is interpreted as indicating a slot consisting entirely of DL symbols.

[0102] When specifying the slot configuration using the SIV method, the position of the symbol where the unknown can be located is restricted as a method of reducing the bits used for SIV. For example, if a total of N symbol If there are OFDM symbols, the Unknown may be restricted to always be located only between OFDM symbol A and OFDM symbol B. Thus, the SIV method indicates the start position and length of the Unknown symbol within the B-A+1 symbols between OFDM symbol A and OFDM symbol B. For example, if A=6 and B=11, the SIV value can be expressed from 0 to 20, requiring 5 bits.

[0103] When specifying a slot configuration using the SIV method, the granularity of the symbols occupied by unknown is limited as a way to reduce the bits used for SIV. In the above, the symbols occupied by unknown were in units of 1 symbol, but this can be extended to P symbol units. SIV notifies the start position and the number of consecutive unknown symbols bundled into P symbols. For example, if P=2, the number of bits required for SIV is reduced to 5 bits.

[0104] As yet another method for signaling semi-static DL / UL allocation information (or semi-static SFI), a slot is assumed to consist of two sub-slots, and the base station and terminal assume that each sub-slot always has the order DL symbol, Unknown symbol, and UL symbol. The SIV method is used as a method for notifying the configuration of each sub-slot. In other words, the start and end positions of the UL symbol in each sub-slot are notified. In more detail, the number of symbols in a sub-slot is set to N. sub-symbol Let N sub-start is the position of the OFDM symbol where the unknown symbol begins within the sub-slot, L sub-symbols Let be the number of consecutively allocated OFDM symbols. Also, assume that the position of the OFDM symbols starts from 0. In one sub-slot, the value SIV for informing the information that an unknown symbol is allocated is determined as follows:

[0105]

number

[0106] Here, the SIV value is 0 to N sub-symbol *(N sub-symbol +1) / 2-1. 0~N sub-symbol *(N sub-symbol SIV values ​​between 0 and 2 (+1) / 2-1 assume that there is at least one Unknown symbol in a sub-slot.

[0107] On the other hand, an additional value can be added to the SIV value to indicate that a sub-slot consists entirely of DL symbols or entirely of UL symbols. For example, to indicate a sub-slot consisting entirely of DL symbols, SIV=N sub-symbol *(N sub-symbol +1) / 2 to indicate a sub-slot consisting entirely of UL symbols, and SIV=N sub-symbol *(N sub-symbol As another example, to indicate a sub-slot consisting entirely of UL symbols, SIV=N sub-symbol *(N sub-symbol +1) / 2 to indicate a sub-slot consisting entirely of DL symbols, and SIV=N sub-symbol *(N sub-symbol +1) / 2+1. Thus, the number of bits required to indicate the format of a sub-slot is N sub-symbol *ceil(log 2 (N sub-symboll *(N sub-symbol +1) / 2+2)) bits. Here, ceil(x) is a function that returns the smallest integer that is greater than or equal to x. Therefore, N symbol =14 and N sub-symbol If = 7, then 5 bits are required per sub-slot, and 10 bits are required for one slot.

[0108] On the other hand, 0 to N sub-symbol *(N sub-symbol Some SIV values ​​between (+1) / 2-1 are interpreted as indicating that a sub-slot consists entirely of DL symbols. For example, an SIV value indicating that the first OFDM symbol of a sub-slot is an Unknown symbol and the rest are all UL is interpreted as indicating a sub-slot consisting entirely of UL symbols. Also, an SIV value indicating that the last OFDM symbol of a sub-slot is Unknown and the rest are all DL is interpreted as indicating a sub-slot consisting entirely of DL symbols.

[0109] When one slot consists of two sub-slots, the slot configuration information of one slot is expressed and transmitted as the configuration information of the two sub-slots. In other words, if the SIV indicating the configuration information of the first sub-slot is SVI1 and the SIV indicating the configuration information of the second sub-slot is SVI12, the terminal can know the configuration information of the entire slot through SIV1 and SIV2. Incidentally, SIV1 and SIV2 are jointly coded and transmitted. As an example of joint coding, the slot configuration information is SIV joint-encoding =SIV1*Q+SIV2, where Q is one greater than the maximum value that SIV2 can have. joint-encoding We obtain SIV2 through the remainder of dividing by Q, and (SIV joint-encoding -SIV2) / Q to obtain SIV1.

[0110] In the above description, the SIV indicates the start and end symbols of the unknown symbols. In the same manner, the last DL symbol and the first UL symbol of the slot can be indicated by the SIV.

[0111] As a second method for notifying the UE of slot configuration information, SFI, i.e., information on whether the symbol of the slot is a downlink symbol (DL), an uplink symbol (UL), or neither a downlink symbol nor an uplink symbol (Unknown), is transmitted via the GC-PDCCH. Here, the GC-PDCCH having the SFI is scrambled to a new GC-RNTI to distinguish it from the conventional GC-PDCCH. For convenience, this is referred to as SFI-RNTI. Hereinafter, the SFI transmitted via the GC-PDCCH is referred to as Dynamic SFI from GC-PDCCH or SFI_GC-PDCCH.

[0112] Referring to FIG. 13, the base station changes the slot configuration (or slot format) using the L1 signal, and transmits information about the changed slot configuration (i.e., Dynamic SFI) to the terminal via the GC-PDCCH. The terminal receives the slot configuration information from the GC-PDCCH, and transmits and receives radio signals according to the slot configuration information. The slot configuration information conveys information about the current slot configuration in which the SFI_GC-PDCCH is detected. In addition, the slot configuration information conveys not only the current slot configuration in which the SFI_GC-PDCCH is detected, but also information about the configuration of the next slot(s) all at once, conveys information indicating that the current slot configuration has the same configuration up to the next few slots, or conveys configuration information of the current slot and the next slot.

[0113] To notify the terminal of the slot format via SFI_GC-PDCCH, the base station notifies the terminal in advance of the slot formats that can be indicated by SFI_GC-PDCCH. At this time, the slot formats that can be indicated by SFI_GC-PDCCH are provided to the terminal using the terminal-specific RRC signal. That is, the mapping table of the slot formats for the terminal to receive SFI_GC-PDCCH and know the slot format is pre-configured with the terminal-specific RRC signal. The method of notifying the terminal of the slot formats that can be indicated by SFI_GC-PDCCH with the terminal-specific RRC signal is a method of notifying whether each symbol is a DL symbol, a UL symbol, or an Unknown symbol, and is the SIV method of notifying the slot configuration information in the semi-static DL / UL allocation information (or semi-static SFI) method described above. As another method, as a method of notifying the terminal of the slot formats that can be indicated by SFI_GC-PDCCH with the terminal-specific RRC signal, DL / UL is indicated for the symbols indicated as Unkown with the semi-static DL / UL allocation information (or semi-static SFI). For example, if five "Unknown" symbols are indicated with the semi-static DL / UL allocation information (or semi-static SFI), SFI_GC-PDCCH notifies whether the five "Unknown" symbols are DL, UL, or "Unknown". Next, the slot format of SFI_GC-PDCCH is pre-defined between the base station and the terminal.

[0114] Table 3 illustrates the SFI_GC-PDCCH indicated by the base station to the terminal. In Table 3, D indicates a DL symbol, U indicates a UL symbol, and X indicates an Unknown symbol. As shown in Table 3, a maximum of two DL / UL switchings are allowed in one slot.

[0115]

Table 3

[0116] SFI_GC-PDCCH includes information regarding the slot configuration of one slot or a plurality of slots.

[0117] If the SFI_GC-PDCCH includes one slot configuration, the SFI_GC-PDCCH includes / indicates 'Slot_index_offset' and 'Slot_format_index'. If the SFI_GC-PDCCH indicates Slot_index_offset=k and Slot_format_index=i, the UE parses the SFI_GC-PDCCH as follows: If the SFI_GC-PDCCH is received in slot n, slot n+k follows slot format i. Here, slot format i means the i-th slot format among multiple slot formats pre-specified by an RRC signal. 'Slot_index_offset' is not indicated by the SFI_GC-PDCCH and is pre-configured in the RRC layer. The UE uses the 'Slot_index_offset' value pre-configured by the RRC layer to parse the SFI_GC-PDCCH.

[0118] When the UE informs the UE of multiple slot configuration information, the SFI_GC-PDCCH includes / indicates 'Slot_numbers' and one 'Slot_format_index'. If the SFI_GC-PDCCH indicates Slot_numbers=k and Slot_format_index=i, the UE parses the SFI_GC-PDCCH as follows: If the SFI_GC-PDCCH is received in slot n, k slots from slot n follow slot format i. Here, slot format i means the i-th slot format in Table 3 or the i-th slot format among multiple slot formats designated in advance by an RRC signal.

[0119] When the terminal notifies multiple slot configuration information, the SFI_GC-PDCCH includes / indicates multiple 'Slot_format_index'. 1 , i 2 , , i jIf the SFI_GC-PDCCH is received in slot n, slot n to slot n+k-1 are in slot format i 1 , slot format i 2 , , slot format i j Here, the slot format i 1 , , i j is i in Table 3 1 , , i j th slot format, or among multiple slot formats designated in advance by RRC signaling, 1 , , i j This means the th slot format.

[0120] When the terminal notifies multiple slot configuration information, the SFI_GC-PDCCH includes / indicates “Slot_numbers” and multiple “Slot_format_index”. 1 , i 2 , , i j ], the terminal analyzes the SFI_GC-PDCCH as follows: If the SFI_GC-PDCCH is received in slot n, it is processed from slot n to slot n+j*k-1 in [slot format i 1 , slot format i 2 , , slot format i j ] is repeated k times. Another analysis is that if j is a divisor of k, then from slot n to slot n+k-1, [slot format i 1 , slot format i 2 , , slot format i j ] is repeated k / j times. Here, slot format i 1 , , i j is i in Table 3 1 , , i jth slot format, or among multiple slot formats designated in advance by RRC signaling, 1 , ,i j This means the th slot format.

[0121] When the terminal notifies multiple slot configuration information, the SFI_GC-PDCCH includes / indicates “Slot_numbers” and multiple “Slot_format_index”. 1 , i 2 , ,i j If the SFI_GC-PDCCH is received in slot n, slots n to n+k-1 are in slot format i. 1 , slot n+k to slot n+2*k-1 are slot format i 2 , , , slot n+(j-1)*k to slot n+j*k-1 are slot format i j Another analysis is that if j is a divisor of k, then slot n to slot n+k / j-1 are in slot format i 1 , slot n+k / j~slot n+2*k / j-1 are slot format i 2 , , , slot n+(j-1)*k / j~slot n+k-1 is slot format i j where slot format i 1 , ,i j is i in Table 3 1 , ,i j th slot format, or among multiple slot formats designated in advance by RRC signaling, 1 , ,i j This means the th slot format.

[0122] When the terminal notifies multiple slot configuration information, the SFI_GC-PDCCH includes multiple 'Slot_format_index', multiple 'Applied_slot_form', and rmat_index" is included / indicated. SFI_GC-PDCCH includes / indicates Slot_format_index=[i 1 , i 2 , , i j ], Applied_slot_format_index=[a(1), a(2), . . . , a(j)], the terminal analyzes the SFI_GC-PDCCH as follows: If the SFI_GC-PDCCH is received in slot n, slot n is assigned slot format i a(1) , slot n+1 is slot format i a(2) , , , slot n+k-1 is slot format i a(k) where a(1), , , a(k) have one of the values ​​1, , j. Here, the slot format i 1 , , i j is i in Table 3 1 , , i j th slot format, or among multiple slot formats designated in advance by RRC signaling, 1 , , i j This means the th slot format.

[0123] When the terminal notifies multiple slot configuration information, the SFI_GC-PDCCH includes / indicates multiple 'Slot_format_index' and multiple 'Applied_slot_index'. 1 , i 2 , , i j ], Applied_slot_index=[b(1), b(2), . . . , b(j)], the terminal analyzes the SFI_GC-PDCCH as follows: If the SFI_GC-PDCCH is received in slot n, slot n+b(1) is in slot format i 1 , slot n+b(2) is slot format i 2 , , , slot n+b(j) is slot format i jwhere b(1), , b(j) are sequentially increasing and each has a non-negative integer value. That is, b(1) <b(2)<···<b(j)。また、スロットフォーマットi 1 , , i j is i in Table 3 1 , , i j th slot format, or among multiple slot formats designated in advance by RRC signaling, 1 , , i j This means the th slot format.

[0124] When the terminal notifies multiple slot configuration information, the SFI_GC-PDCCH includes / indicates multiple 'Slot_format_index' and multiple 'Applied_slot_index'. 1 , i 2 , , i j ], Applied_slot_index=[b(1), b(2), . . . , b(j)], the terminal analyzes the SFI_GC-PDCCH as follows: If the SFI_GC-PDCCH is received in slot n, slot n+b(1) is in slot format i 1 , slot n+b(1)+b(2) is slot format i 2 , , slot n+b(1)+b(2)+···+b(j) is slot format i j where b(1), , b(k) each have a non-negative integer value. Another analysis is that if SFI_GC-PDCCH is received in slot n, then slot n-1+b(1) is a slot format i 1 , slot n-1+b(1)+b(2) is slot format i 2 , , slot n-1+b(1)+b(2)+···+b(j) is slot format i j where b(1), , and b(k) have natural values. 1 , , i j is i in Table 31 , , i j th slot format, or among multiple slot formats designated in advance by RRC signaling, 1 , , i j This means the th slot format.

[0125] In the above method, Slot_numbers is notified by an RRC signal and is not included in the SFI_GC-PDCCH. In this case, when the terminal receives the SFI_GC-PDCCH, the terminal knows slot configuration information by using "Slot_numbers" obtained through the RRC signal. Alternatively, Slot_numbers is determined according to the period in which the SFI_GC-PDCCH is transmitted. For example, if the terminal monitors the GC-PDCCH in which the Dynamic SFI is transmitted every 4 slots, Slot_numbers is 4 slots.

[0126] In the method, the slots may be described in terms of slots including at least one unknown symbol configured with a semi-static SFI, i.e., the slot format indicated by the SFI_GC-PDCCH is sequentially applied to slots including at least one unknown symbol configured with a semi-static SFI.

[0127] As a third method for notifying the UE of slot configuration information, the UE may know the configuration of the scheduled slot by using the DCI of the US-PDCCH. For example, if the DCI includes DL signal or channel (e.g., PDSCH or CSI-RS) scheduling information, the UE assumes that the symbol in the slot where the DL signal or channel is scheduled is the DL symbol. Although not limited thereto, the DCI may include information on the start position and length of the PDSCH. Also, if the DCI includes UL signal or channel (e.g., PUSCH or SRS) scheduling information, the UE assumes that the symbol in the slot where the UL signal or channel is scheduled is the UL symbol. Although not limited thereto, the DCI may include information on the start position and length of the PUSCH. The (DL / UL grant) DCI is a DCI scrambled by the C-RNTI. Hereinafter, the slot configuration information transmitted via the US-PDCCH is referred to as Dynamic SFI from US-PDCCH, or SFI_US-PDCCH. The SFI_US-PDCCH provides configuration information on the OFDM symbol(s) scheduled in the slot. In this specification, a distinction is made between signals and channels to aid in understanding the invention, but signals generally include signals transmitted through channels, and signals / channels are commonly referred to as signals.

[0128] Referring to FIG. 14, in the SFI_US-PDCCH in which the base station transmits downlink scheduling information, the start OFDM symbol index and the end OFDM symbol index of the PDSCH, or information that can be used to obtain such information, are notified. When the terminal successfully receives the SFI_US-PDCCH, it knows the start OFDM symbol index and the end OFDM symbol index of the PDSCH, or information that can be used to obtain such information, and receives the PDSCH by rate-matching according to the scheduling information. Referring to FIG. 14, the slot in which the PDSCH for the terminal is scheduled is slot n, which is the same slot as the SFI_US-PDCCH transmission slot. Also, the slot in which the PDSCH for the terminal is scheduled may be the (n + k)th slot after the SFI_US-PDCCH is transmitted (where k is an integer greater than or equal to 1), or may be the slots from the nth slot in which the SFI_US-PDCCH is transmitted to n + L - 1 (where L represents the number of slots in which the PDSCH allocated to the terminal is transmitted, assuming slot aggregation). The index of the slot in which the PDSCH for the terminal is scheduled is transmitted from the SFI_US-PDCCH that schedules the PDSCH. Therefore, the terminal assumes that the symbols in which the PDSCH is formed are DL symbols.

[0129] Referring to Figure 14, the base station informs the start OFDM symbol index and end OFDM symbol index of the PUSCH, or information from which the information can be known, in the SFI_US-PDCCH which transmits uplink scheduling information. If the terminal successfully receives the SFI_US-PDCCH, the terminal knows the start OFDM symbol index and end OFDM symbol index of the PUSCH, or information from which the information can be known, and receives the PUSCH by performing rate-matching according to the scheduling information. Referring to Figure 14, the slot in which the PUSCH for the terminal is scheduled is slot n, which is the same slot as the SFI_US-PDCCH transmission slot. Also, the slot in which the PUSCH for the terminal is scheduled may be the n+k (where k is an integer equal to or greater than 1) th slot after the SFI_US-PDCCH is transmitted, or may be from the n+k (where k is an integer equal to or greater than 0) th slot in which the SFI_US-PDCCH is transmitted to n+k+L-1 (where L means the number of slots in which the PUSCH allocated to the terminal is transmitted, assuming slot aggregation). The index of the slot in which the PUSCH is scheduled for the terminal is transmitted from the SFI_US-PDCCH that schedules the PUSCH. Thus, the terminal assumes that the symbol in which the PUSCH is formed is a UL symbol.

[0130] As another example, the base station transmits a part of the slot configuration information via the SFI_GC-PDCCH and transmits the SFI_US-PDCCH that transmits the remaining part of the scheduling information. When the terminal receives the SFI_GC-PDCCH and the SFI_US-PDCCH, it knows the slot format / configuration. Specifically, the configurable slot configuration indication information is transmitted by being divided into two steps. In the first step (group common), a set of a part of the overall configuration is indicated, and in the second step, a specific configuration within the corresponding set is indicated. Referring to FIG. 11, the base station bundles eight slot configurations two by two, sends four slot configuration information via the SFI_GC-PDCCH, and transmits one of the two slot configurations via the SFI_US-PDCCH. The terminal knows the overall slot configuration by using the slot configuration information transmitted in bundles of two received from the SFI_GC-PDCCH and the information indicating one of the two slot configurations received from the SFI_US-PDCCH. Through the above method, the control overhead of transmitting the slot configuration information via the SFI_GC-PDCCH and the SFI_US-PDCCH can be reduced.

[0131] Due to the propagation delay, the terminal transmits the uplink signal earlier than the downlink signal. This is called Timing advance (TA), and the value for TA is set in the RRC signal. Therefore, if the uplink symbol is arranged immediately after the downlink symbol, the terminal must perform reception in the downlink symbol and transmission in the uplink symbol simultaneously. To solve this, the terminal needs a GAP symbol for DL-to-UL switching between the downlink symbol and the uplink symbol. The GAP symbol may be indicated by an Unknown symbol. Therefore, if the slot is configured without an Unknown symbol between the DL symbol and the UL symbol for the terminal, it is necessary to insert an Unknown symbol into the slot.

[0132] 15 and 16, when a terminal that is assigned a DL-only slot (e.g., slot n+k) knows that the next slot (e.g., slot n+k+1) is a UL-only slot, the last G OFDM symbols of the DL-only slot are punctured or not received. Here, G is the gap between DL and UL, and may be a different value for each terminal or cell, or may be a value that is known in advance by the terminal and the base station. G is expressed as the number of OFDM symbols or a certain time period.

[0133] 17, the UE is assigned UL-only as the configuration of a future slot (e.g., slot n+k+1) via a GC-PDCCH or a US-PDCCH containing scheduling information at the time of scheduling (e.g., slot n), and the GC-PDCCH is transmitted / received in the slot (e.g., slot n+k) immediately before the assigned UL-only slot. In this case, the GC-PDCCH of the slot (e.g., slot n+k) immediately before the UL-only slot indicates the slot configuration before the UL-only slot, and the UE uses slot configuration information of the GC-PDCCH received from the slot (e.g., slot n+k) immediately before the UL-only slot to know whether the slot (e.g., slot n+k) immediately before the UL-only slot is a DL-only slot.

[0134] 18, the UE is assigned UL-only as the configuration of a future slot (e.g., slot n+k+1) via a GC-PDCCH or a US-PDCCH containing scheduling information at the time of scheduling (e.g., slot n), and the GC-PDCCH is transmitted / received in at least one (e.g., slot n+ki) of the slots (e.g., slots n+k, n+k-1, ...) before the assigned UL-only slot. In this case, the GC-PDCCH indicates the slot configuration immediately before the UL-only slot (e.g., slot n+k+1), and the UE uses slot configuration information of the GC-PDCCH received from the closest slot immediately before the assigned UL-only slot to know whether the slot immediately before the UL-only slot (e.g., slot n+k) is a DL-only slot.

[0135] 17 and 18, when a terminal to which a UL-only slot is assigned knows that the previous slot is a DL-only slot, it punctures or does not transmit the first G OFDM symbols of the UL-only slot. Here, G is a gap between DL and UL, and may be a different value for each terminal or cell, or a different value for each cell, or may be a value that is known in advance by the terminal and the base station. G is expressed as the number of OFDM symbols or a certain time period. As an example, if G has a different value for each terminal, G is determined using a TA value set between the base station and the terminal. The G value of a terminal with a small TA value is given by one OFDM symbol, and the G value of a terminal with a large TA value is given by two OFDM symbols.

[0136] Example 2: Slot configuration information override As described above, there are three methods for notifying the UE of slot configuration information: (i) semi-static SFI, (ii) SFI_GC-PDCCH, and (iii) SFI_US-PDCCH. As described above, the semi-static SFI is slot configuration information consisting of an RRC signal, and the SFI_GC-PDCCH and SFI_US-PDCCH are slot configuration information consisting of an L1 signal. The semi-static SFI has information for indicating the symbol of the slot as a DL symbol, a UL symbol, or an Unknown symbol. The SFI_GC-PDCCH has information for indicating the symbol of the slot as a DL symbol, a UL symbol, or an Unknown symbol. The SFI_US-PDCCH has information for indicating the symbol of the slot as a DL symbol or a UL symbol. When the UE receives the RRC signal and the L1 signal, it should determine whether the symbol of the slot is a DL symbol, a UL symbol, or an Unknown symbol, and should determine whether to transmit a signal according to the determined symbol.

[0137] In the present invention, downlink symbols and uplink symbols configured in semi-static SFI are either instructed in the other direction by SFI_GC-PDCCH or SFI_US-PDCCH or are not instructed as unknown. However, unknown symbols configured in semi-static SFI are instructed in the other direction by SFI_GC-PDCCH or SFI_US-PDCCH. Therefore, the problem to be solved by the present invention is related to symbols configured as unknown in semi-static SFI unless otherwise specified.

[0138] SFI_GC-PDCCH override One of the problems to be solved by the present invention relates to a method for a terminal to analyze multiple SFI_GC-PDCCHs when configuration information for one slot is configured to be received on multiple SFI_GC-PDCCHs.

[0139] 13 and 19, the base station includes slot configuration information for only the current slot, (ii) configuration information for the current slot and the next slot, or (iii) slot configuration information for the current slot and N future slots via the SFI_GC-PDCCH. The terminal is configured to know the current slot or the N slot configurations after the current slot when receiving the SFI_GC-PDCCH according to the slot configuration information transmitted from the SFI_GC-PDCCH. Here, N is an integer of 1 or more. N is dynamically changed, configured in the RRC, or dynamically instructed to the terminal by the base station within the set configured in the RRC. Referring to FIG. 19, when the SFI_GC-PDCCH carries multiple slot configuration information, the slot configuration information of one slot is transmitted by multiple SFI_GC-PDCCHs. As an example of the present invention, if the base station receives multiple SFI_GC-PDCCHs related to configuration information of one slot from the terminal, the base station and the terminal operate as follows. - Using information on the most recently successfully received SFI_GC-PDCCH among multiple SFI_GC-PDCCHs, the terminal determines whether to receive downlink transmission or transmit uplink transmission as a DL symbol, UL symbol, or unknown symbol. That is, if one of multiple SFI_GC-PDCCHs is successfully received, the terminal determines whether to receive DL symbol, UL symbol, or unknown symbol using information on the SFI_GC-PDCCH. That is, the terminal assumes that multiple SFI_GC-PDCCHs for one slot indicate the same DL symbol, UL symbol, or unknown symbol configuration. -The UE receives downlink transmission or transmits uplink by determining DL symbol, UL symbol, or unknown symbol using information of the SFI_GC-PDCCH configured to be received most recently among the multiple SFI_GC-PDCCHs. That is, if the most recent SFI_GC-PDCCH of the multiple SFI_GC-PDCCHs is successfully received, the UE determines DL symbol, UL symbol, or unknown symbol using information of the SFI_GC-PDCCH. The UE assumes that the DL symbol, UL symbol, or unknown symbol indicated by the previous SFI_GC-PDCCH may be changed by the subsequent SFI_GC-PDCCH.

[0140] For example, when GC-PDCCH related to change of slot configuration information is received in two consecutive slots or in slots of consecutive periods, one may be received but the other may not be received. For example, 1) in two slots, SFI_GC-PDCCH may not be received in the first slot and SFI_GC-PDCCH may be received in the second slot, or 2) conversely, in two slots, SFI_GC-PDCCH may be received in the first slot and SFI_GC-PDCCH may not be received in the second slot. In this case, the terminal uses the configuration information indicated by the successfully received SFI_GC-PDCCH for terminal operation. On the other hand, in the cases of 1) and 2), it is assumed that the terminal fails to receive slot configuration information from the base station. As a result, the terminal does not change / update the slot configuration information, but uses the slot configuration information currently held by the terminal to perform scheduled downlink reception and uplink transmission. Alternatively, even in the cases of 1) and 2), the terminal receives downlink and transmits uplink using the following three methods, just as when it receives SFI_GC-PDCCH regarding a change in slot configuration information consecutively from the base station, based on the slot in which SFI_GC-PDCCH is received. From the slot next to the slot in which the GC-PDCCH is received, the base station performs downlink transmission or uplink reception using the changed slot configuration information, and the terminal assumes the changed slot configuration information to perform downlink reception and uplink transmission. In the periodically set transmission interval, starting from the slot of the next period after receiving the GC-PDCCH, the base station performs downlink transmission or uplink reception using the changed slot configuration information, and the terminal performs downlink reception and uplink transmission assuming the changed slot configuration information. Starting from the slot in which the GC-PDCCH is received, the base station performs downlink transmission or uplink reception using the changed slot configuration information, and the terminal performs downlink reception and uplink transmission assuming the changed slot configuration information.

[0141] Override between SFI_GC-PDCCH and SFI_US-PDCCH In the proposal of the present invention, slot configuration information is transmitted from SFI_GC-PDCCH and / or SFI_US-PDCCH. Another problem to be solved by the present invention relates to the operation of a terminal when a terminal receives SFI_GC-PDCCH and SFI_US-PDCCH and the information on the slot configuration indicated by SFI_GC-PDCCH is different from the information on the slot configuration indicated by SFI_US-PDCCH.

[0142] 13 and 14, the terminal knows the slot configuration through the slot configuration information of SFI_GC-PDCCH (e.g., symbol configuration information within a slot) (FIG. 13), and knows the scheduled slot configuration using the scheduling information of SFI_US-PDCCH (e.g., DL / UL scheduled OFDM symbol set) (FIG. 14). For the same slot, the slot configurations obtained through the two pieces of information may be the same or different.

[0143] Meanwhile, if the slot configuration information transmitted from the SFI_GC-PDCCH and the slot configuration information transmitted from the SFI_US-PDCCH (for a scheduled symbol) do not match, the terminal prioritizes the SFI_US-PDCCH and discards the slot configuration information transmitted from the successfully received SFI_GC-PDCCH. That is, the terminal assumes that the slot configuration information in the SFI_GC-PDCCH is not detected (e.g., skips / cancels the operation after the SFI_GC-PDCCH is detected) and performs a downlink reception operation or an uplink transmission operation according to the scheduling information and the slot configuration information in the SFI_US-PDCCH. That is, regardless of whether the SFI_GC-PDCCH and the SFI_US-PDCCH collide, the terminal always transmits the PUSCH or receives the PDSCH as scheduled via the SFI_US-PDCCH. Meanwhile, this method is applied on a symbol-by-symbol basis. For example, the terminal assumes that the SFI_GC-PDCCH is not detected only for the colliding symbol.

[0144] As another solution, if the scheduling information received from the SFI_US-PDCCH (for a scheduled symbol) differs from the configuration information received from the SFI_GC-PDCCH, the terminal ignores the scheduling information from the SFI_US-PDCCH and does not perform uplink transmission (e.g., PUSCH) or downlink reception (e.g., PDSCH) according to the corresponding scheduling.

[0145] As an example, if the PDSCH reception period (OFDM symbol) indicated by the scheduling information of SFI_US-PDCCH does not match the DL configuration according to the slot configuration information of SFI_GC-PDCCH, the terminal determines that the scheduling information received from SFI_US-PDCCH is different from the (slot configuration) information received from GC-PDCCH. For example, referring to Figures 11 and 14, if SFI_GC-PDCCH indicates slot configuration 3, it is determined that the slot configuration information of SFI_GC-PDCCH and the scheduling information of SFI_US-PDCCH match only if SFI_US-PDCCH indicates that the end position of the PDSCH is the 4th OFDM symbol, and the terminal receives the PDCCH according to the scheduling information of SFI_US-PDCCH.

[0146] Similarly, if the PUSCH transmission period (OFDM symbol) indicated by the scheduling information of the SFI_US-PDCCH does not match the DL configuration according to the slot configuration information of the GC-PDCCH, the UE determines that the scheduling information received from the SFI_US-PDCCH is different from the (slot configuration) information received from the SFI_GC-PDCCH. For example, referring to Figures 11 and 14, if the SFI_GC-PDCCH indicates slot configuration 3, it is determined that the slot configuration information of the SFI_GC-PDCCH and the scheduling information of the SFI_US-PDCCH match only when the SFI_US-PDCCH indicates that the starting position of the PUSCH is the 6th OFDM symbol, and the UE transmits the PUCCH according to the scheduling information of the SFI_US-PDCCH.

[0147] As another example, if the start position, length, or end position of the OFDM symbol indicated by the DL scheduling information of the SFI_US-PDCCH is not included in the DL configuration according to the slot configuration information of the SFI_GC-PDCCH and overlaps with an unknown symbol, the UE determines that the scheduling information received from the SFI_US-PDCCH is different from the information received from the SFI_GC-PDCCH. For example, if the SFI_GC-PDCCH indicates that the downlink DL transmission consists of the fourth OFDM symbol and the SFI_US-PDCCH indicates that the PDSCH exists in the seventh OFDM symbol beyond the corresponding section, the UE does not receive the PDSCH (e.g., skips / cancels the reception operation).

[0148] Similarly, if the start position, length, or end position of the OFDM symbol indicated by the UL scheduling information of SFI_US-PDCCH is not included in the UL configuration according to the slot configuration information of SFI_GC-PDCCH and overlaps with an unknown symbol, the UE determines that the scheduling information received from SFI_US-PDCCH is different from the information received from SFI_GC-PDCCH. For example, if the SFI_GC-PDCCH indicates slot configuration 3 in FIG. 11 and the SFI_US-PDCCH indicates that the start position of the PUSCH is the 5th OFDM symbol, the UE does not transmit the PUSCH (e.g., skips / cancels the receiving operation).

[0149] For ease of explanation, hereinafter, a case where "the scheduling information received from the SFI_US-PDCCH differs from the (slot configuration) information received from the SFI_GC-PDCCH" is expressed as the occurrence of a "(slot configuration) violation."

[0150] Referring to FIG. 20, if a base station transmits an SFI_US-PDCCH from an n-th slot to a terminal and the SFI_US-PDCCH allocates a PDSCH to the (n+k)-th slot (where k is an integer equal to or greater than 1), the terminal to which the PDSCH is allocated from the received SFI_US-PDCCH should determine whether or not the slot configuration is violated in order to determine whether or not the PDSCH can be received. As an example of the present invention, if an SFI_GC-PDCCH is transmitted in a slot in which downlink is scheduled, the terminal determines whether or not there is a violation using slot configuration information from the SFI_US-PDCCH and scheduling information of the SFI_US-PDCCH. In FIG. 20, if an SFI_US-PDCCH is transmitted from slot n and transmission of a PDSCH is scheduled in slot n+k, the terminal checks whether or not there is a violation using the SFI_GC-PDCCH received in slot n+k.

[0151] Referring to Figure 21, if the SFI_GC-PDCCH is not transmitted or received in a slot where the PUSCH (PDSCH) is scheduled (in the case of a UL-only slot), the UE determines whether or not the scheduled slot is violated by using the slot configuration information of the most recently received SFI_GC-PDCCH and the scheduling information of the SFI_US-PDCCH. As shown in Figure 21, if slots n to n+k are scheduled, SFI_GC-PDCCH is received in slot n+ki, and SFI_GC-PDCCH is not received in slots n+k-i+1 to n+k, the UE determines whether or not slots n+k-i+1 to n+k are violated by using the SFI_GC-PDCCH received in slot n+ki.

[0152] The UE is assigned DL-only as the configuration of a future slot (e.g., slot n+k) via the SFI_GC-PDCCH or SFI_US-PDCCH containing scheduling information at the time of scheduling (e.g., slot n), and the SFI_GC-PDCCH is transmitted / received in the assigned DL-only slot (e.g., slot n+k). In this case, the SFI_GC-PDCCH of the DL-only slot indicates the slot configuration after the DL-only slot, and the UE uses the slot configuration information of the SFI_GC-PDCCH to know whether the slot immediately after the DL-only slot (e.g., slot n+k+1) is a UL-only slot.

[0153] The UE is assigned DL-only as the configuration of a future slot (e.g., slot n+k) via a GC-PDCCH or a US-PDCCH containing scheduling information at the time of scheduling (e.g., slot n), and the GC-PDCCH is not transmitted / received in the assigned DL-only slot (e.g., slot n+k). In this case, the GC-PDCCH received in the closest slot before the DL-only slot (e.g., slot n+ki) indicates the slot configuration after the DL-only slot, and the UE uses the slot configuration information of the GC-PDCCH to know whether the slot immediately after the DL-only slot (e.g., slot n+k+1) is a UL-only slot.

[0154] If cross-slot scheduling is configured, the operation of the terminal receiving UL (or DL) scheduling information from the base station is as follows. When the terminal receives scheduling information for a specific slot (i.e., US-PDCCH), it monitors the GC-PDCCH from the slot after the slot in which the US-PDCCH was received from the base station to the scheduled slot to check whether the configuration of the corresponding slot has changed. The monitored slots are called a monitoring interval. If the terminal cannot receive the GC-PDCCH during the monitoring interval, it transmits a PUSCH (or receives a PDSCH) from the scheduled slot according to the scheduling information of the US-PDCCH. If the terminal receives one or more GC-PDCCHs during the monitoring interval, it receives a PDSCH and transmits a PUSCH or not (e.g., skips / cancels related operations) according to the slot configuration and the scheduling information notified from the most recently received GC-PDCCH (based on the scheduled slot).

[0155] 19, 22, and 23 show the operation of a terminal that receives scheduling information. The terminal is scheduled to receive a PDSCH or transmit a PUSCH in slot n+3 via a US-PDCCH in slot n. At this time, the US-PDCCH indicates that the slot configuration of slot n+3 is A. The terminal sets the slots from the slot after receiving the US-PDCCH to the scheduled slot, that is, slot n+1, slot n+2, and slot n+3, as a monitoring period. The terminal monitors the GC-PDCCH during the monitoring period. At this time, the GC-PDCCH that transmits slot configuration information of slot n+3 is received in slot n+1, slot n+2, and slot n+3, respectively. Here, the GC-PDCCHs of slot n+1, slot n+2, and slot n+3 indicate the slot configuration of slot n+3 to be slot format B, slot format C, and slot format D, respectively. In this case, the terminal determines that the information closest to slot n+3, i.e., the slot configuration of n+3, is slot format D. As a result, the terminal determines whether to receive a PDSCH or transmit a PUSCH in slot n+3 (e.g., skip / cancel related operations) based on (i) the slot configuration according to slot format D and (ii) the scheduling information received in slot n. If a GC-PDCCH is not received during the monitoring period, the terminal receives a PDSCH or transmits a PUSCH in slot n+3 according to the scheduled information in slot n.

[0156] As an example of whether to receive PDSCH or transmit PUSCH according to the scheduling information, when PDSCH (PUSCH) is scheduled, if the OFDM symbol to which PDSCH (PUSCH) is assigned is still configured as DL (UL) in the GC-PDCCH most recently received in the monitoring period, the terminal receives PDSCH (transmits PUSCH). As another example of whether to receive PDSCH or transmit PUSCH according to the scheduling information, if the slot configuration known when PDSCH (PUSCH) is scheduled is the same as the slot configuration known through the GC-PDCCH most recently received in the monitoring period, the terminal receives PDSCH (transmits PUSCH), and if they are different, the terminal does not receive PDSCH (transmits PUSCH). If the slot configuration information of GC-PDCCH and US-PDCCH is different, UL transmission may be prohibited because it may generate an interference signal, and only DL reception may be allowed. Although the present invention has been described above with reference to PDSCH / PUSCH scheduled via US-PDCCH, it is also applicable to uplink / downlink control signals such as reference signals, UCI, SRS, etc., which are transmitted (non-)periodically. In this case, the same operation is performed in units of OFDM symbols or RBs in which the corresponding control signals are transmitted. Here, the transmission of non-periodic signals is scheduled via US-PDCCH.

[0157] In another embodiment, slot configuration information is transmitted together with downlink or uplink scheduling information via US-PDCCH. In this case, the UE's slot determination method is as follows.

[0158] FIG. 24 illustrates an operation when slot configuration information is included in the US-PDCCH. When the slot format of FIG. 11 is notified, the bit size of the slot configuration information in the US-PDCCH is 3 bits. Meanwhile, the format / configuration of the slot is not limited to DL and UL only, and may be DL, UL, any, sidelink, blank, etc. In this case, the bit size of the slot configuration information is determined depending on the number of slot configuration information. Referring to FIG. 24, if the reception / detection of the GC-PDCCH (slot configuration information) is successful through the CRC check (S2402, S2404, yes), the terminal(s) does not use the slot configuration information (e.g., 3-bit information) transmitted from the US-PDCCH, but performs uplink transmission and downlink reception in the corresponding slot according to the slot configuration information of the GC-PDCCH (S2406). Meanwhile, if the reception / detection of the GC-PDCCH fails through the CRC check (S2402, S2404, no), but the CRC check of the US-PDCCH is successful (S2408), the terminal uses the slot configuration information (e.g., 3-bit information) in the US-PDCCH to know the uplink / downlink / unknown configuration of the symbols in the slot (S2410, yes), and performs uplink transmission and downlink reception in the corresponding slot based on the information (S2412). If the slot configuration information cannot be read from the US-PDCCH, the terminal does not perform uplink transmission and downlink reception in the corresponding slot (S2414). Meanwhile, unlike the example of the drawing, the terminal does not receive the GC-PDCCH (slot configuration information), but receives only the US-PDCCH to know the slot configuration. In other words, if the reception / detection of the US-PDCCH (slot configuration information) is successful, the terminal does not need to receive the GC-PDCCH (slot configuration information). Here, not receiving the GC-PDCCH (slot configuration information) includes skipping decoding of the GC-PDCCH or skipping / canceling an operation based on the slot configuration information even if the GC-PDCCH is successfully detected (for a symbol set scheduled by the US-PDCCH (slot configuration information)).Also, if the GC-PDCCH (slot configuration information) has configuration information related to multiple slots, not receiving the GC-PDCCH is strictly applicable only to the slots scheduled by the US-PDCCH.

[0159] Meanwhile, slot configuration information in the US-PDCCH in which uplink or downlink scheduling information is transmitted is determined according to the number of slot configuration cases that the base station can transmit. More specifically, the slot configuration information transmitted from the US-PDCCH is the same as the slot configuration information transmitted from the GC-PDCCH. Referring to FIG. 11, the slot configuration information in the GC-PDCCH indicates one of eight slot configurations, and the slot configuration information in the US-PDCCH transmits the same information. Meanwhile, through the slot configuration information in the US-PDCCH, a number of cases that is less than the number of cases that can be transmitted from the GC-PDCCH is transmitted. As an example, referring to FIG. 11, the slot configuration information in the GC-PDCCH indicates one of eight slot configurations, and the slot configuration information in the US-PDCCH indicates one of four slot configurations (e.g., four specific slot configurations among eight slot configurations 0 to 7) by two bits.

[0160] As another example, in the US-PDCCH where downlink scheduling information is transmitted, the slot configuration information indicates the position where the downlink OFDM symbol ends in the slot. For example, if the base station uses slot configuration 5, it indicates that the downlink is transmitted up to the second OFDM symbol. A terminal scheduled in the downlink knows the end point of the downlink OFDM symbol from the slot configuration information (e.g., 3 bits) and successfully receives the downlink using the information. Also, a terminal scheduled in the uplink knows the end point of the downlink OFDM symbol from the slot configuration information and knows the start point of the uplink OFDM symbol according to the GP configuration.

[0161] In addition, in the US-PDCCH where the uplink scheduling information is transmitted, the slot configuration information indicates the position where the uplink OFDM symbol starts in the slot. For example, if slot configuration 5 is used, it indicates that the uplink transmission starts from the 4th OFDM symbol. A terminal scheduled in the uplink knows the start time of the uplink OFDM symbol from the slot configuration information and successfully transmits the uplink using the information. Similarly, a terminal scheduled in the downlink knows the start time of the uplink OFDM symbol from the slot configuration information and knows the end time of the downlink OFDM symbol according to the GP configuration.

[0162] If the base station and the terminal know the semi-static SFI, the above-mentioned slot configuration information indicates by 1 bit whether the slot configuration used by the base station is the same as the semi-static SFI. If the slot configuration information is 0, the slot configuration used by the base station is the same as the semi-static SFI, and if the slot configuration information is 1, the slot configuration used by the base station is different from the semi-static SFI. The terminal determines whether to perform an operation according to the scheduled information in the US-PDCCH according to the slot configuration information. If the slot configuration information is 0, the slot configuration used by the base station is the same as the semi-static SFI, so the terminal performs scheduled uplink transmission or downlink reception based on the semi-static SFI. If the slot configuration information is 1, the slot configuration used by the base station is different from the semi-static SFI, so the terminal does not perform scheduled uplink transmission or downlink reception.

[0163] If the base station and the terminal know the semi-static SFI, the above-mentioned slot configuration information is determined according to the semi-static SFI. For example, if the semi-static SFI indicates slot configuration information i and the slot configuration information for indicating four different slot configurations in the US-PDCCH is 2-bit information, 00 indicates slot configuration information i and 01 indicates slot configuration information i+j. 1 , 10 is slot configuration information i+j 2 11 is slot configuration information i+j3 Here, i 1 , i 2 , i 3 is used to inform different slot configuration information, which is predetermined according to the semi-static SFI and configuration information. That is, four different slot format information is informed, one of which is set to be the same as the semi-static SFI (bit 00). The terminal uses the semi-static SFI to transmit uplink or receive downlink scheduled by the US-PDCCH. As another example, a method of specifying an increase or decrease in the number of DL or UL symbols, different from the indication of slot configuration information, is considered. That is, this operation is an operation of changing the slot configuration compared to the slot configuration indicated by the semi-static SFI, for example, specifying an increase in DL. As an example, if the semi-static SFI is DL(a) / Unknown(1) / UP(6-a), the base station has four options for a: increase by 1 / increase by 2 / decrease by 1 / no change. The base station transmits the selected option to the terminal as 2-bit information, thereby flexibly changing the number of DL / UL, instead of changing the pre-defined slot format and configuration information.

[0164] If the base station and the terminal know the semi-static SFI, the slot configuration information is determined according to the terminal operation and the semi-static SFI notified by the US-PDCCH. For example, the US-PDCCH informs the terminal whether downlink reception or uplink transmission according to the scheduling information can be performed assuming the semi-static SFI. More specifically, if the 1-bit slot configuration information in the US-PDCCH is set to 0, the terminal performs the downlink reception operation or the uplink transmission operation according to the scheduling information of the US-PDCCH assuming the semi-static SFI. On the other hand, if the 1-bit slot configuration information in the US-PDCCH is set to 1, the terminal does not perform any operation related to downlink reception or uplink transmission regardless of the scheduling information of the US-PDCCH.

[0165] Referring to FIG. 11, if the slot configuration configured with the semi-static SFI is 4 and the base station uses slot configuration 5, the uplink scheduled terminal performs uplink transmission using the 5th, 6th, and 7th OFDM symbols. In this case, the base station assigns the 4th OFDM symbol to the uplink, but the terminal uses it in the DL-UL switching gap. Therefore, in this case, the base station sets 1-bit slot configuration information in the US-PDCCH to 0 so that the terminal transmits uplink in the corresponding slot, and the base station receives the corresponding uplink from the terminal. However, if the slot configured with the semi-static SFI is 4 and the base station uses slot configuration 3, the uplink scheduled terminal may not be able to transmit in the slot configuration configured with the semi-static SFI. Therefore, in this case, the base station sets 1-bit slot configuration information in the US-PDCCH to 1 so that the terminal does not transmit uplink in the corresponding slot. Referring to FIG. 11, if the slot configuration configured with the semi-static SFI is 4 and the base station uses slot configuration 3, the uplink scheduled terminal uses the second and third OFDM symbols to receive the downlink. In this case, the base station assigns the fourth OFDM symbol to the downlink, but the terminal ignores it and receives it. Therefore, in this case, the base station sets 1-bit slot configuration information in the US-PDCCH to 0 so that the terminal receives in the downlink in the corresponding slot, and the base station receives the corresponding downlink from the terminal. However, if the slot configured with the semi-static SFI is 4 and the base station uses slot configuration 5, the downlink scheduled terminal may not be able to receive the downlink. In this case, the base station sets 1-bit slot configuration information in the US-PDCCH to 1 so that the terminal does not receive in the downlink in the corresponding slot.

[0166] If the terminal knows the semi-static SFI, the base station determines the slot configuration information in the US-PDCCH according to whether the US-PDCCH is related to uplink transmission or downlink transmission and the semi-static SFI. For example, the base station informs the downlink scheduled terminal of only the slot configuration for monitoring the downlink transmission and monitoring the unusable interval (e.g., UL) according to the semi-static SFI, and informs the uplink scheduled terminal of only the slot configuration for transmitting the uplink to the unusable interval (e.g., DL) according to the semi-static SFI. For example, referring to FIG. 11, if the slot configuration 4 is used as the slot configuration configured by the semi-static SFI, the base station transmits only the information on the slot configurations 5, 6, and 7 as slot configuration information to the uplink scheduled terminal, and transmits only the slot configuration information on the slot configurations 0, 1, and 2 to the downlink scheduled terminal. In this method, the size of the required slot configuration information may differ depending on the slot configuration configured by the semi-static SFI. Furthermore, the size of the required slot configuration information may differ depending on the uplink and downlink.

[0167] In order to inform the terminal of the slot configuration, the US-PDCCH is scrambled to a different RNTI and transmitted. To inform one terminal of the slot configuration, one or more RNTIs are assigned, or multiple RNTIs are generated using one assigned RNTI. For example, several RNTIs may be generated from one RNTI using an interleaver with a predetermined pattern. Also, several RNTIs may be generated from one RNTI using scrambling with a predetermined pattern. In the terminal, the pattern for generating RNTIs is pre-agreed between the base station and the terminal. By detecting the US-PDCCH scrambled to a certain RNTI from among the different RNTIs, the slot format and slot configuration can be known.

[0168] The RNTI used in this method is determined according to the slot configuration. Here, the RNTI means a terminal-specific RNTI defined to indicate slot configuration information. Referring to FIG. 5 and FIG. 11, the base station selects one of eight RNTIs according to the current slot configuration and scrambles the US-PDCCH. As an example, the RNTI used for the US-PDCCH that schedules the downlink is determined according to the position where the downlink OFDM symbol ends. Also, the RNTI used for the PDCCH that schedules the uplink is determined according to the position where the uplink OFDM symbol starts. Also, in this method, the RNTI is determined according to the slot configuration configured with the semi-static SFI. If the base station and the terminal know the slot configuration configured with the semi-static SFI, referring to FIG. 5 and FIG. 11, the RNTI is determined according to the relative difference between the current slot configuration of the base station and the slot configuration configured with the semi-static SFI. For example, if a slot configuration configured with semi-static SFI can use four RNTIs in slot configuration i, the first RNTI is the slot configuration configured with semi-static SFI i, the second RNTI is the slot configuration i+j. 1 The third RNTI is slot configuration i+j 2 The fourth RNTI is slot configuration i+j 3 Here, j 1 , j 2 , j 3is predetermined to inform different slot configurations. That is, four different slot format information is informed, one of which is set to be the same as the semi-static SFI (for example, bit 00). If the base station and the terminal know the slot configuration configured with the semi-static SFI, in this method, the RNTI is determined according to the operation of the terminal informed by the US-PDCCH and the slot configuration configured with the semi-static SFI. As an example, when two RNTIs can be used, if the first RNTI is used, the operation scheduled by the US-PDCCH is performed assuming the slot configuration configured with the semi-static SFI, and if the second RNTI is used, the operation scheduled by the US-PDCCH is not performed. As another example, an increase or decrease in the number of DL or UL symbols is specified differently from the indication of slot configuration information. That is, it is for the operation of changing the slot format compared to the semi-static SFI, for example, an increase in DL is specified. For example, if the semi-static SFI is DL(a) / Unknown(1) / UP(6-a), the base station has four options for a: increase by 1 / increase by 2 / decrease by 1 / no change. The base station transmits one of the four options with 2-bit information to flexibly change the number of DL / UL, instead of changing the pre-defined slot format and configuration information.

[0169] 25 is a block diagram of a receiver when notifying a slot configuration using an RNTI. The receiver includes a step of estimating and compensating a channel using a DM-RS pattern (S2502), a (QPSK) demodulation step (S2504), a channel decoding step (S2506), a step of checking CRCs with as many RNTIs as possible (S2508), and a step of determining whether PDCCH decoding is successful according to the CRC check (S2510). The receiver checks the CRCs using all RNTIs that can be used to notify a slot configuration. In this case, if only one CRC is valid and all remaining CRCs are invalid, the receiver obtains slot configuration information and corresponding operations from the RNTI that provided the valid CRC. Here, the RNTI means a terminal-specific RNTI defined to indicate slot configuration information.

[0170] FIG. 26 shows a situation that may occur when the slot configuration used by the base station and the slot configuration used by the terminal are different. In FIG. 26, the actual slot format is the slot configuration used by the base station in practice, and the UE decision is the slot configuration recognized by the terminal. As described above, the base station transmits the GC-PDCCH (Dynamic SFI) to inform the terminal(s) of the slot configuration. However, a specific terminal fails to receive the GC-PDCCH (Dynamic SFI) transmitted from the base station. In this case, the terminal does not know whether the base station transmitted the GC-PDCCH to inform the terminal of the slot configuration, so the terminal operates with the slot configuration expected to be used by the base station.

[0171] Referring to FIG. 26(a), when the base station uses slot configuration 2 and the terminal uses slot configuration 0 (see FIG. 11), the downlink scheduled terminal determines that all slots are downlink OFDM symbols and receives signals. Therefore, the terminal receives signals even for two OFDM symbols not assigned to the downlink, which increases the probability of failing to decode the downlink signal, and wastes terminal energy. In addition, if the LLR (Log Likelihood Ratio) values ​​corresponding to the two OFDM symbols not assigned to the downlink are stored in a soft buffer, performance degradation may occur during retransmission. In addition to the above problem, resource consumption may occur due to downlink retransmission. Referring to FIG. 26(b), when the base station uses slot configuration 4 and the terminal uses slot configuration 5 (see FIG. 11), the uplink scheduled terminal starts uplink transmission from the fourth OFDM symbol. However, according to the slot configuration of the base station, uplink transmission starts from the fifth OFDM symbol, so it is difficult for the base station to receive the uplink signal due to the uplink transmission of the incorrect terminal. In addition, since an incorrect uplink signal is transmitted to a GP intended to prevent downlink-uplink buffering, buffering may occur in neighboring terminals receiving the downlink, which may result in degradation of the downlink receiving performance of the neighboring terminals.

[0172] As an example for solving the above problem, if the terminal cannot successfully receive slot configuration information transmitted from the GC-PDCCH (i.e., does not detect the GC-PDCCH), the terminal does not transmit in the scheduled uplink symbol, does not receive the scheduled downlink symbol, or does not transmit the uplink and receive the downlink. If the user does not receive the scheduled downlink symbol in the downlink, the base station transmits further information through HARQ retransmission. If the user does not transmit the scheduled uplink symbol in the uplink, the base station transmits further uplink scheduling information so that the terminal performs uplink transmission. However, the above method does not use the resources allocated in the scheduled slot, which causes resource waste, and requires a retransmission or rescheduling method, which causes additional delay time.

[0173] As another example, the base station predefines a semi-static SFI to be used. If the terminal successfully receives slot configuration information transmitted via the GC-PDCCH (i.e., detects the GC-PDCCH), it operates according to the indicated slot format. On the other hand, if the terminal does not successfully receive slot configuration information transmitted via the GC-PDCCH (i.e., does not detect the GC-PDCCH), it performs uplink transmission or downlink reception according to the semi-static SFI.

[0174] Override between SFI and periodic signals #1 One of the problems to be solved by the present invention is a method for determining whether a terminal can transmit / receive a periodic signal configured by RRC, and relates to a terminal operation for determining a symbol direction using information about the slot configuration of SFI_GC-PDCCH. The problem addressed here includes a case where the terminal fails to receive SFI_GC-PDCCH. Also, the problem addressed here is a case where the terminal does not receive SFI_US-PDCCH.

[0175] A periodic signal refers to all DL / UL signals set by a higher layer (RRC) to be transmitted periodically. In a 3GPP NR system, UL signals transmitted periodically set by the RRC layer include periodic SRS (sounding reference signal), SR (scheduling request), periodic CSI, SPS-PUSCH (semi-persistent PUSCH), etc., and DL signals transmitted periodically include CSI-RS (channel state information reference signal), SPS-PDSCH, etc. SR and periodic CSI are transmitted via PUCCH. In particular, the base station informs the terminal of the slot-period / offset and transmission resource (e.g., OFDM symbol(s) in a slot) of the periodic signal via an RRC signal.

[0176] Unlike when scheduling information is received via SFI_US-PDCCH, if a terminal configured to transmit or receive a periodic signal does not have scheduled information, there is no SFI_US-PDCCH for obtaining slot configuration information for a slot in which a periodic signal is scheduled to be transmitted / received. Therefore, if scheduling information is not received via SFI_US-PDCCH, a terminal operation for transmitting a periodic UL or receiving a periodic DL needs to be defined. In addition, a method for determining a slot configuration is required to determine whether a terminal configured to transmit / receive periodically without scheduling information transmits / receives a periodic signal or receives a periodic signal in a slot set for periodic transmission / reception (hereinafter, a periodic slot).

[0177] The operation of a terminal that periodically transmits / receives without receiving scheduling information via the SFI_US-PDCCH is as follows. First, the terminal defines a slot from a slot in which a periodic signal of the current period is transmitted / received to a slot in which a periodic signal of the next period is transmitted / received as a monitoring period. The terminal knows the monitoring period via an RRC signal or determines it according to the period in which the SFI_GC-PDCCH is transmitted. Next, the terminal monitors the SFI_GC-PDCCH including slot configuration information for the transmission / reception slot of the next period during the monitoring period. As an example, when the terminal is configured to periodically transmit an uplink signal (e.g., periodic SRS, SR, periodic CSI, SPS-PUSCH) on a specific time-frequency resource (e.g., OFDM symbol(s)) (within each periodically configured slot), if the terminal is instructed that the time-frequency resource of the periodic signal (within the periodically configured slot) is an uplink configuration via the SFI_GC-PDCCH, the terminal transmits the periodic signal (in the corresponding slot) on the time-frequency resource. Meanwhile, when a particular time-frequency resource (within each periodically configured slot) is configured to periodically transmit an uplink signal (e.g., periodic SRS, SR, periodic CSI, SPS-PUSCH), if the terminal is instructed via the SFI_GC-PDCCH that the time-frequency resource of the periodic signal (within the periodically configured slot) is not an uplink configuration (e.g., a downlink (DL) symbol or an unknown symbol), the terminal shall transmit the periodic signal (in the corresponding slot). (e.g., skip / cancel transmission operation). Similarly, when configured to receive downlink signals (e.g., CSI-RS, SPS-PDSCH) periodically on a specific time-frequency resource (e.g., OFDM symbol(s)) (in each periodically configured slot), if the time-frequency resource of the periodic signal (in the periodically configured slot) is indicated as a downlink configuration via the SFI_GC-PDCCH, the terminal receives the periodic signal (in the corresponding slot) on the time-frequency resource. On the other hand, when configured to receive downlink signals (e.g., CSI-RS, SPS-PDSCH) periodically on a specific time-frequency resource (in each periodically configured slot), if the time-frequency resource of the periodic signal (in the periodically configured slot) is indicated as not a downlink configuration via the SFI_GC-PDCCH (e.g., an uplink (UL) symbol or an unknown symbol), the terminal does not receive the periodic signal (in the corresponding slot) (e.g., skip / cancel reception operation). Furthermore, if the terminal fails to receive an SFI_GC-PDCCH for a time-frequency resource (e.g., OFDM symbol(s)) of the periodic signal (in a periodically configured slot) (i.e., if the SFI_GC-PDCCH is not detected), the terminal does not transmit the periodic signal (in the corresponding slot) (e.g., skips / cancels the transmission operation). Here, the specific time-frequency resource includes an uplink / downlink transmission / reception resource in units of an OFDM symbol and / or RB. For example, the specific time-frequency resource is defined as a specific OFDM symbol or set of OFDM symbols in a slot.

[0178] As another example, the terminal transmits and receives signals that are originally configured to be performed periodically (i.e., periodic signals) regardless of whether the terminal receives / confirms the GC-PDCCH during the monitoring period. Here, the terminal transmits and receives some / all of the periodic signals, such as RS, ACK / NACK, SRS, and other high-importance signals, without checking slot configuration information (e.g., SFI_GC-PDCCH). In this case, the terminal performs transmission and reception operations assuming that the base station appropriately schedules the transmission and reception of the corresponding periodic signals and that no collision occurs.

[0179] Furthermore, the UE always transmits the ACK / NACK (among the periodic signals) without checking the slot configuration information of the GC-PDCCH. The PUCCH for transmitting the ACK / NACK is allocated to one or more last OFDM symbols in a slot, and the UE always transmits the PUCCH on the assumption that the symbol corresponding to the PUCCH is allocated to at least the UL (regardless of the slot configuration information of the GC-PDCCH). Here, the periodic ACK / NACK refers to an ACK / NACK that indicates whether the SPS-PDSCH configured to be received periodically is successfully received.

[0180] FIG. 22 illustrates a terminal operation when transmitting and receiving periodically without receiving scheduling information for a certain period. Referring to FIG. 22, the terminal is configured to transmit and receive periodic signals in slot n and slot n+3. In order to determine whether or not a periodic signal can be transmitted and received in slot n+3, a monitoring period is defined as slot n+1, slot n+2, and slot n+3. In this case, the GC-PDCCHs of slot n+1, slot n+2, and slot n+3 indicate the slot configuration of slot n+3 in slot format B, slot format C, and slot format D, respectively. In this case, the terminal determines that the slot configuration (i.e., slot configuration D) indicated by the SFI_GC-PDCCH transmitted from the slot closest to the periodic slot n+3 (i.e., slot n+2) is the slot configuration of slot n+3, and determines whether or not to transmit and receive a periodic signal in slot n+3 based on slot configuration D.

[0181] Override between SFI and periodic signals #2 One of the problems to be solved by the present invention is a method for determining whether a terminal can transmit / receive a periodic signal configured by RRC, and relates to a terminal operation for determining a symbol direction using information on a slot configuration of SFI_US-PDCCH. Here, a method is described for a terminal configured to transmit or receive a periodic signal / channel from a base station, when the terminal is scheduled to transmit a downlink data channel or a downlink shared channel (e.g., PDSCH) or an uplink data channel or an uplink shared channel (e.g., PUSCH) from a base station in a slot (hereinafter, a periodic slot) in which the periodic signal and channel are transmitted or received. The problem addressed here is a case in which the terminal is configured not to monitor the GC-PDCCH (dynamic SFI) or is configured to monitor the GC-PDCCH (dynamic SFI) but fails to receive it (e.g., fails to detect the GC-PDCCH (dynamic SFI)).

[0182] A periodic signal refers to all DL / UL signals set by a higher layer (RRC) to be transmitted periodically. In a 3GPP NR system, UL signals transmitted periodically set by the RRC layer include periodic SRS, SR, periodic CSI, SPS-PUSCH, etc., and DL signals transmitted periodically include CSI-RS, SPS-PDSCH, etc. SR and periodic CSI are transmitted via PUCCH. In particular, the base station informs the terminal of the slot-period / offset and transmission resource (e.g., OFDM symbol(s) in a slot) of the periodic signal via an RRC signal.

[0183] When the base station transmits a US-PDCCH instructing scheduling for the same symbol as the symbol for transmitting and receiving a periodic signal / channel (within a periodically configured slot), the terminal determines the configuration of the periodic slot according to the slot configuration information received most recently among the GC-PDCCH(s) and SFI_US-PDCCH received in the monitoring period. This is because the base station manages both the transmission of periodic signals / channels and also the transmission of scheduling information (US-PDCCH), so the base station scheduler may not schedule different operations in the same slot. Therefore, the periodic slot configuration is determined according to the slot configuration information received most recently among the PDSCH scheduled by the most recently received SFI_GC-PDCCH. The terminal determines whether it is possible to receive the PDSCH scheduled by the SFI_US-PDCCH (or transmit the PUSCH) according to the determined slot configuration, and determines whether it is possible to receive the corresponding PDSCH (or transmit the PUSCH) or transmit or receive the periodic signal / channel, and transmits or receives the periodic signal / channel.

[0184] Here, whether or not it is possible to receive a PDSCH (or transmit a PUSCH) (in a slot in which transmission and reception of a periodic signal is scheduled) is determined as follows. - If the US-PDCCH is received earlier than the GC-PDCCH, the terminal receives the PDSCH (or PUSCH) scheduled by the US-PDCCH (DCI). -If there is a GC-PDCCH received more recently than the US-PDCCH, the terminal receives the PDSCH (or transmits the PUSCH) if the OFDM symbol(s) to which the PDSCH (or PUSCH) is assigned according to the scheduling information of the US-PDCCH is DL (or UL) according to the slot configuration information of the GC-PDCCH most recently received within the monitoring period. When a PDSCH (or PUSCH) is scheduled via a US-PDCCH, if the slot configuration received by the terminal is the same as the slot configuration received by the terminal via the slot configuration information of the GC-PDCCH most recently received within the monitoring period, the terminal receives the PDSCH (or transmits the PUSCH). Otherwise, the terminal does not receive the PDSCH (or transmit the PUSCH) (e.g., skips / cancels the related operation).

[0185] As an example of determining whether transmission and reception of a periodic signal / channel is possible (in a periodically configured slot), if the UL / DL direction of the OFDM symbol(s) to which the periodic signal / channel is assigned for transmission and reception matches the slot configuration received by the terminal via the slot configuration information of the most recently received GC-PDCCH within the monitoring period or the UL / DL direction of the OFDM symbol(s) received by the terminal via the US DCI (US-PDCCH), the terminal transmits and receives the periodic signal / channel (in the corresponding slot); if there is no match, the terminal does not transmit and receive the periodic signal / channel (in the corresponding slot).

[0186] FIG. 23 shows the operation when a terminal configured to transmit and receive a periodic signal / channel receives scheduling information from a base station. Referring to FIG. 23, the terminal is configured to transmit and receive a periodic signal / channel in slots n and n+3, and receives a US-PDCCH indicating the scheduling information from slot n+2 to slot n+3. In order to determine whether to perform transmission and reception of the periodic signal / channel in slot n+3 and whether the terminal operation according to the scheduling information can be performed, the GC-PDCCH received within slots n+1 to n+3 and the US-PDCCH received in slot n+2 are used. The slot configuration of slot n+3 is determined by the US-PDCCH transmitted from the slot closest to slot n+3 among the US-PDCCHs or by the slot configuration according to the slot configuration information of the GC-PDCCH. In FIG. 23, the GC-PDCCH (SFI) of slot n+3 informs the slot configuration closest to slot n+3. Therefore, if the GC-PDCCH (SFI) is received in slot n+3, the terminal determines the slot configuration of slot n+3 based on the slot configuration information of the GC-PDCCH (for example, slot format D).

[0187] If a PDSCH or PUSCH is scheduled in a specific slot (i.e., a periodic slot) configured to transmit and receive a periodic signal / channel, some / all of the specific periodic signals / channels are transmitted and received without checking slot configuration information for the corresponding scheduling. In this case, the terminal performs transmission and reception of the specific periodic signal / channel, assuming that the base station properly schedules the transmission and reception of the corresponding periodic signal / channel and no collision occurs. Here, the specific periodic signal / channel includes important signals / channels such as a synchronization signal (PSS, SSS) / PBCH block, an RS (e.g., CSI-RS, Phase Tracking RS, Tracking RS), an ACK / NACK transmission channel, an SR transmission channel, a beam recovery request (RB) transmission channel, and an SRS. The specific periodic signal / channel includes all of the SS, RS, ACK / NACK transmission channel, SR transmission channel, BR transmission channel, and SRS, or a subset thereof. For example, the specific periodic signal / channel may include an ACK / NACK transmission channel. In this case, the ACK / NACK transmission channel is configured so that the terminal transmits and receives without checking slot configuration information. The PUCCH for transmitting the ACK / NACK is assigned to one or more last OFDM symbols in the slot. For example, the PUCCH (ACK / NACK) is assigned to the last OFDM symbol, the last two OFDM symbols, or the last 4 to 14 OFDM symbols in the slot. The terminal always transmits the PUCCH, assuming that the OFDM symbol corresponding to the PUCCH is assigned to at least the UL. Here, the periodic ACK / NACK refers to an ACK / NACK indicating whether or not the SPS PDSCH configured to be received periodically has been successfully received. Also, for example, the specific periodic signal / channel may include the SS, PBCH, or SSB transmitted from the base station. In this case, the terminal always receives the SS / PBCH block without checking the slot configuration information.

[0188] Override between SFI and periodic signals #3 One of the problems that the present invention aims to solve is a method for determining whether a terminal can transmit / receive a periodic signal configured by RRC, and relates to the operation of a terminal that determines the direction of a symbol using information about the slot configuration of SFI_GC-PDCCH and information about the slot configuration of SFI_US-PDCCH.

[0189] A periodic signal generally refers to all DL / UL signals set by a higher layer (RRC) to be transmitted periodically. In a 3GPP NR system, UL signals set by the RRC layer to be transmitted periodically include periodic SRS, SR, periodic CSI, SPS-PUSCH, etc., and DL signals to be transmitted periodically include CSI-RS, SPS-PDSCH, etc. SR and periodic CSI are transmitted via PUCCH. In addition, signals configured in a terminal via an RRC signal transmitted from a base station and configured to be received periodically in a downlink by the terminal include periodic SCI-RS, semi-persistent CSI-RS, TRS, or Phase Tracking RS, SPS-PDSCH, etc. In more detail, a base station informs a terminal of a slot-period / offset and a transmission resource (e.g., OFDM symbol(s) in a slot) of a periodic signal via an RRC signal.

[0190] If the symbol(s) in which the signal (i.e., periodic signal) (e.g., CSI-RS, SPS-PDSCH) configured to be periodically received by the terminal within a slot is located is indicated by a semi-static DL / UL allocation (semi-static SFI) as a DL symbol, the terminal receives the signal configured to be periodically received within the corresponding slot. If the symbol(s) in which the signal configured to be periodically received by the terminal within a slot is located is / are indicated by a semi-static DL / UL allocation (semi-static SFI) as Unknown symbol(s), the condition for the terminal to receive periodically within the corresponding slot is that 1) receive the SFI_GC-PDCCH for the symbol(s) in which the periodic signal is received, and the corresponding SFI_GC-PDCCH indicates that symbol(s) as a DL symbol, or 2) regardless of the reception of the SFI_GC-PDCCH, inform that the symbol(s) in which the signal configured to be periodically received is received is / are DL symbols via the SFI_US-PDCCH. In the case of 1), regardless of whether the SFI_US-PDCCH can be detected, the terminal receives the periodic signal within the corresponding slot. In the case of 2), if it is informed that the symbol(s) in which the signal configured to be periodically received is received is / are DL symbols via the SFI_US-PDCCH, even if the SFI_GC-PDCCH is not received (i.e., the SFI_GC-PDCCH is not detected), the terminal receives the periodic signal within the corresponding slot. Incidentally, the terminal determines whether the symbol in which the signal configured to be periodically received is received is a DL symbol or not via the scheduling information of the DL data (e.g., PDSCH) received via the SFI_US-PDCCH. Conversely, the condition for the terminal not to receive the signal configured to be periodically received within a slot is that 1) receive the SFI_GC-PDCCH for the symbol(s) in which the signal configured to be periodically received is received, and the corresponding SFI_GC-PDCCH indicates that symbol as an Unknown symbol or a UL symbol, 2) fail to receive the SFI_GC-PDCCH, or 3) fail to receive the information that the symbol(s) in which the signal configured to be periodically received is received is a DL symbol from the SFI_US-PDCCH.Considering the override situation between SFI_GC-PDCCH, SFI_US-PDCCH and periodic signals, 1) means failure to receive SFI_US-PDCCH, 2) means failure to receive both SFI_GC-PDCCH and SFI_US-PDCCH, and 3) means failure to receive SFI_GC-PDCCH.

[0191] Signals configured in a terminal through an RRC signal transmitted from a base station and periodically transmitted to an uplink include periodic SRS, semi-persistent SRS, periodic PUCCH for CSI reporting, and SPS-PUSCH. The periodic PUCCH is piggybacked on a PUSCH scheduled by a US-PDCCH. An operation for a terminal (or a user) configured to transmit a periodic signal through an RRC signal transmitted from a base station to transmit the periodic signal is as follows. If a symbol in which a signal configured to be periodically transmitted by a terminal is located in a slot is indicated as a UL symbol in a semi-static DL / UL allocation (semi-static SFI), the terminal transmits a signal (e.g., periodic SRS, semi-persistent SRS, CSI, SPS-PUSCH) configured to be periodically transmitted in the corresponding slot. In addition, if a symbol in which a signal configured to be periodically transmitted by a terminal is located in a slot is indicated as an unknown symbol in a semi-static DL / UL allocation (semi-static SFI), the conditions for transmitting the signal configured to be periodically transmitted by the terminal in the corresponding slot include 1) receiving an SFI_GC-PDCCH for a symbol in which a signal configured to be transmitted as a periodic signal is transmitted, and the corresponding SFI_GC-PDCCH indicates that the symbol is a UL symbol, or 2) indicating that the symbol in which the signal configured to be periodically transmitted is transmitted is a DL symbol in an SFI_US-PDCCH regardless of reception of an SFI_GC-PDCCH. Note that a symbol in which UL data (e.g., PUSCH) or a UL control signal (e.g., PUCCH) is scheduled through the SFI_US-PDCCH is determined to be a UL symbol. In the case of 1), regardless of whether the SFI_US-PDCCH is detected, the terminal transmits a periodic signal in the corresponding slot. In case 2), if the symbol(s) at which the signal configured to be received periodically is received is indicated as a UL symbol via the SFI_US-PDCCH, the terminal transmits a periodic signal in the corresponding slot even if the SFI_GC-PDCCH is not received (i.e., the SFI_GC-PDCCH is not detected).Conversely, conditions for the terminal not to transmit a signal configured to be transmitted periodically within a slot include 1) receiving an SFI_GC-PDCCH for a symbol on which a signal configured to be transmitted periodically is transmitted, and the corresponding SFI_GC-PDCCH indicates that the symbol is an unknown symbol or a DL symbol, 2) failing to receive an SFI_GC-PDCCH, or 3) failing to receive information from an SFI_US-PDCCH or US-PDCCH that a symbol on which a signal configured to be transmitted periodically is transmitted is a UL symbol. Considering an override situation between the SFI_GC-PDCCH, SFI_US-PDCCH, and a periodic signal, 1) means failure to receive even the SFI_US-PDCCH, 2) means failure to receive both the SFI_GC-PDCCH and SFI_US-PDCCH, and 3) means failure to receive the SFI_GC-PDCCH.

[0192] Example 3: General operation regarding slot configuration Hereinafter, as a method of notifying slot configuration information, a method in which a terminal determines symbols in a slot as DL / UL / Unknown when a semi-static SFI, SFI_GC-PDCCH, or SFI_US-PDCCH exists or exists in part will be described. In the following description, the expression that the SFI is "Nothing" means that the base station does not transmit the SFI or the terminal cannot receive it (e.g., PDCCH missing, PDCCH detection failure). In addition, the expression that the SFI is "Anything" means that certain slot configuration information is transmitted via the SFI. Unless otherwise specified, SFI="Anything" includes SFI="Nothing".

[0193] A preferred embodiment of the present invention is shown in Table 4. Referring to Table 4, the terminal determines the format / configuration for each symbol in a slot as follows: First, for DL / UL / Unknown symbols, the terminal determines in the following order of priority: -Semi-static SFI>Dynamic SFI from US-PDCCH>Dynamic SFI from GC-PDCCH

[0194] For unknown symbols, the terminal makes a decision according to the following priority order: -Dynamic SFI from US-PDCCH>Dynamic SFI from GC-PDCCH>Semi-static SFI

[0195] More specifically, referring to Table 4, the terminal determines and defines the format / configuration for the symbols in the slot according to the slot configuration information and the following symbol determination rules. - The DL / UL / Reserved symbols configured in the semi-static SFI are not changed. -Unknown symbols configured in semi-static SFI or symbols not configured in semi-static SFI are modified by the symbol configuration of SFI_GC-PDCCH or SFI_US-PDCCH. For an unknown symbol configured in semi-static SFI or a symbol not configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration, the UE follows the symbol configurations of the SFI_GC-PDCCH and SFI_US-PDCCH. For an unknown symbol configured in semi-static SFI or a symbol not configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations for the corresponding symbol, the terminal always prioritizes the SFI_GC-PDCCH to determine the corresponding symbol.

[0196] [Table 4]

[0197] Referring to Table 5, the terminal determines the format / configuration for each symbol in a slot as follows: First, the priority of DL / UL / Reserved and the priority of Unknown are configured to be different, and the terminal determines the format / configuration for DL / UL / Reserved symbols according to the following priority: -Semi-static SFI>Dynamic SFI from GC-PDCCH=Dynamic SFI from US-PDCCH

[0198] In addition, for unknown symbols, the terminal makes a decision according to the following priority order. -Dynamic SFI from GC-PDCCH=Dynamic SFI from US-PDCCH>semi-static SFI

[0199] Here, "=" indicates the same priority. Between SFIs marked with "=", the priority is determined to be different depending on the time when the terminal receives the SFI. For example, the most recently received SFI may have a higher priority.

[0200] More specifically, referring to Table 5, the terminal determines and defines the format / configuration for the symbols in the slot according to the slot configuration information and the following symbol determination rules. - The DL / UL / Reserved symbols configured in the semi-static SFI are not changed. -Unknown symbols configured in semi-static SFI or symbols not configured in semi-static SFI are modified by the symbol configuration of SFI_GC-PDCCH or SFI_US-PDCCH. For an unknown symbol configured in semi-static SFI or a symbol not configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration, the UE follows the symbol configurations of the SFI_GC-PDCCH and SFI_US-PDCCH. For an unknown symbol configured with semi-static SFI or a symbol not configured with semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the UE determines the slot format by prioritizing the most recently received SFI_GC-PDCCH or SFI_US-PDCCH. If the SFI_GC-PDCCH and SFI_US-PDCCH are received simultaneously, the UE can expect a slot format that always has the same symbol configuration. Therefore, if the SFI_GC-PDCCH and SFI_US-PDCCH are received simultaneously but indicate different symbol configurations, the UE determines this as an error case.

[0201] [Table 5]

[0202] Referring to Table 6, the terminal determines the format / configuration for each symbol in the slot as follows: First, for DL / UL / Reserved symbols, the terminal determines in the following order of priority. -Semi-static SFI>Dynamic SFI from GC-PDCCH>Dynamic SFI from US-PDCCH

[0203] For unknown symbols, the terminal makes a decision according to the following priority order: -Dynamic SFI from GC-PDCCH>Dynamic SFI from US-PDCCH>Semi-static SFI

[0204] More specifically, referring to Table 6, the terminal determines and defines the format / configuration for the symbols in the slot according to the slot configuration information and the following symbol determination rules. - The DL / UL / Reserved symbols configured in the semi-static SFI are not changed. -Unknown symbols configured in semi-static SFI or symbols not configured in semi-static SFI are modified by the symbol configuration of SFI_GC-PDCCH or SFI_US-PDCCH. For an unknown symbol configured in semi-static SFI or a symbol not configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration, the UE follows the symbol configurations of the SFI_GC-PDCCH and SFI_US-PDCCH. For an unknown symbol configured in semi-static SFI or a symbol not configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal always prioritizes the SFI_GC-PDCCH to determine the corresponding symbol.

[0205] [Table 6]

[0206] Next, a case will be described in which the priority order of the "Reserved" symbols and the priority order of the DL / UL / Unknown symbols are configured to be different.

[0207] Referring to Table 7, the terminal determines the format / configuration for each symbol in the slot as follows: First, for the reserved symbol, the terminal determines in the following order of priority. -Semi-static SFI>Dynamic SFI from GC-PDCCH=Dynamic SFI from US-PDCCH

[0208] The terminal determines the DL / UL / Unknown symbols according to the following priority order: -Dynamic SFI from GC-PDCCH=Dynamic SFI from US-PDCCH>semi-static SFI

[0209] Here, "=" indicates the same priority. Between SFIs marked with "=", the priority is determined to be different depending on the time when the terminal receives the SFI. For example, the most recently received SFI may have a higher priority.

[0210] More specifically, referring to Table 7, the terminal determines and defines the format / configuration for the symbols in the slot according to the slot configuration information and the following symbol determination rules. - A Reserved symbol configured in a semi-static SFI is always a Reserved symbol. - All symbols except for the reserved symbols configured in the semi-static SFI are changed to SFI_GC-PDCCH and SFI_US-PDCCH symbols. For all symbols except for reserved symbols configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration, the UE follows the symbol configurations of the SFI_GC-PDCCH and SFI_US-PDCCH. For all symbols except for reserved symbols configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal always prioritizes the SFI_US-PDCCH when determining the corresponding symbol.

[0211] [Table 7]

[0212] Referring to Table 8, the terminal determines the format / configuration for each symbol in the slot as follows: First, for the reserved symbol, the terminal determines in the following order of priority. -Semi-static SFI>Dynamic SFI from GC-PDCCH=Dynamic SFI from UE-specific PDCCH

[0213] The terminal determines the DL / UL / Unknown symbols according to the following priority order: -Dynamic SFI from UE-specific PDCCH>Dynamic SFI from GC-PDCCH>Semi-static SFI

[0214] More specifically, referring to Table 8, the terminal determines and defines the format / configuration for the symbols in the slot according to the slot configuration information and the following symbol determination rules. - A Reserved symbol configured in a semi-static SFI is always a Reserved symbol. - All symbols except for the reserved symbols configured in the semi-static SFI are changed to SFI_GC-PDCCH and SFI_US-PDCCH symbols. For all symbols except for reserved symbols configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration, the UE follows the symbol configurations of the SFI_GC-PDCCH and SFI_US-PDCCH. For all symbols except for reserved symbols configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal always prioritizes the SFI_US-PDCCH when determining the corresponding symbol.

[0215] [Table 8]

[0216] Referring to Table 9, the terminal determines the format / configuration for each symbol in the slot as follows: First, for the reserved symbol, the terminal determines in the following order of priority. -Semi-static SFI>Dynamic SFI from GC-PDCCH=Dynamic SFI from UE-specific PDCCH

[0217] The terminal determines the DL / UL / Unknown symbols according to the following priority order: -Dynamic SFI from GC-PDCCH>Dynamic SFI from UE-specific PDCCH>Semi-static SFI

[0218] More specifically, referring to Table 9, the terminal determines and defines the format / configuration for the symbols in the slot according to the slot configuration information and the following symbol determination rules. - A Reserved symbol configured in a semi-static SFI is always a Reserved symbol. - All symbols except for the reserved symbols configured in the semi-static SFI are changed to SFI_GC-PDCCH and SFI_US-PDCCH symbols. For all symbols except for reserved symbols configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration, the UE follows the symbol configurations of the SFI_GC-PDCCH and SFI_US-PDCCH. For all symbols except for reserved symbols configured in semi-static SFI, if the SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal always prioritizes the SFI_GC-PDCCH when determining the corresponding symbol.

[0219] [Table 9]

[0220] In the method of determining the format / configuration for each symbol in a slot to know the slot format in Tables 4 to 9, the terminal does not use the direction (e.g., DL, UL, or SL (sidelink)) of a statically or semi-statically configured periodic signal / channel. If a statically or semi-statically configured periodic signal / channel exists in the terminal, the terminal adds it to Tables 4 to 9, respectively, and applies it to the following terminal operation. - If the direction of the symbol to which the periodic signal / channel is assigned is the same as the direction of the symbol determined by the terminal, the terminal transmits / receives the periodic signal / channel. - If not (i.e., the symbol directions are different), the terminal does not transmit / receive the periodic signal / channel (e.g., skips the transmission / reception operation).

[0221] The terminal operation for the periodic signal of Table 4 according to the preferred embodiment of the present invention is illustrated in FIG.

[0222] [Table 10]

[0223] As another example, the terminal determines slot configuration information by giving top priority to the direction of the periodic signal / channel configured in the terminal, i.e., the terminal always transmits and receives the statically or semi-statically assigned periodic signal / channel without changing the direction of the periodic signal / channel statically or semi-statically assigned to the terminal.

[0224] In addition to the operations of the base station and the terminal in Tables 4 to 9, the determination of the symbols from the terminal in one embodiment of the present invention is as follows. The configuration of OFDM symbols that do not overlap with statically or semi-statically assigned periodic signals / channels can be known through Tables 4 to 9. The configuration of OFDM symbols that overlap with statically or semi-statically assigned periodic signals / channels is always determined in the direction indicated by the statically or semi-statically assigned periodic signals / channels regardless of the terminal operations in Tables 4 to 9. For example, symbols transmitting a synchronization signal, PBCH, periodic CSI-RS, etc. are always regarded as DL symbols. Also, symbols transmitting PRACH and periodic SRS are always regarded as UL symbols. Also, symbols transmitting periodic PUCCH are always regarded as UL symbols.

[0225] The terminal is configured to periodically monitor or receive a CORESET for receiving a US-PDCCH or a GC-PDCCH. In this case, if the configuration of symbols in which the CORESET is transmitted is determined to be DL, the terminal is configured to monitor or receive the CORESET. Furthermore, even if the configuration of symbols in which the CORESET is transmitted is determined to be Unknown in the semi-static SFI, the terminal is configured to monitor or receive the CORESET.

[0226] Next, a method of determining slot configuration information when the terminal monitors the GC-PDCCH at specific intervals and the monitored symbol is an UL symbol or an SFI_GC-PDCCH and is unknown will be described.

[0227] For example, when the UE monitors the GC-PDCCH at a specific period, if the symbol corresponding to the monitored CORESET is an UL symbol (e.g., when the semi-static SFI indicates UL, the previously transmitted SFI_GC-PDCCH indicates UL, or the previously transmitted SFI_US-PDCCH indicates UL), the UE operates without expecting to receive the SFI_GC-PDCCH. That is, the UE determines the slot configuration by changing the SFI_GC-PDCCH to 'Nothing' in the UE operation according to Tables 4 to 9.

[0228] As another example, when the terminal monitors the GC-PDCCH at a specific period, if the symbol corresponding to the CORESET to be monitored is an UL symbol (for example, when the semi-static SFI indicates UL, the previously transmitted SFI_GC-PDCCH indicates UL, or the previously transmitted SFI_US-PDCCH indicates UL), the terminal assumes that the GC-PDCCH is transmitted in an adjacent slot and monitors the GC-PDCCH in the adjacent slot to receive the SFI_GC-PDCCH. Preferably, the adjacent slot is the nearest common-search space in the future after the configured common-search space. Preferably, the adjacent slot is indicated by an RRC signal or an L1 signal. Referring to FIG. 27(a), the terminal is configured to monitor the SFI_GC-PDCCH every 4 slots. In this case, if the CORESET for monitoring the SFI_GC-PDCCH in slot n+5 is an UL symbol, the terminal monitors the SFI_GC-PDCCH in slot n+4 (for example, n+5) instead of slot n+4. Here, slot n+4+k indicates the slot closest to slot n+4 among the slots including DL symbols. Referring to FIG. 27(b), the terminal is configured to monitor the SFI_GC-PDCCH every four slots. In this case, if the CORESET for monitoring the SFI_GC-PDCCH in slot n+4 is a UL symbol, the terminal monitors the SFI_GC-PDCCH in slot n+4+k (e.g., n+3) instead of slot n+4. Here, slot n+4-k indicates the slot closest to slot n+4 among the slots including DL symbols.

[0229] If the monitored slot is changed, the terminal expects a different length of SFI_GC-PDCCH. More specifically, the terminal assumes that the number of slots to which the slot configuration information of the SFI_GC-PDCCH applies is the same as the monitoring period. Referring to FIG. 27, if the terminal is configured to monitor the SFI_GC-PDCCH every 4 slots, the SFI_GC-PDCCH has slot configuration information of 4 slots. If the monitored slot is changed and the terminal receives the SFI_GC-PDCCH in the changed slot, the terminal monitors the GC PDCCH assuming that the slot configuration information corresponding to the number of slots from the changed slot to the next monitored slot is transmitted to the SFI_GC-PDCCH. Referring to FIG. 27(a), since the monitored slot is changed from slot n+4 to slot n+5, the terminal assumes that the slot configuration information for three slots, that is, slot n+5, slot n+6, and slot n+7, is transmitted through the GC-PDCCH in slot n+5. 27(b), since the slot to be monitored has changed from slot n+4 to slot n+3, it is assumed that slot configuration information for four slots, i.e., slot n+4, slot n+5, slot n+6, and slot n+7, is transmitted via the GC-PDCCH in slot n+3. Here, since slot information for slot n+3 is expected to be received from slot n via the SFI_GC-PDCCH, the SFI_US-PDCCH transmitted in slot n+3 does not include slot information for slot n+3.

[0230] The terminal is configured to periodically monitor the SFI_US-PDCCH. The terminal expects that the SFI_GC-PDCCH is always transmitted via the GC-PDCCH in each monitoring period. When the terminal monitors the GC-PDCCH in each monitoring period, if the terminal fails to receive the GC PDCCH, the terminal assumes that all symbols in the slot indicated by the SFI_GC-PDCCH are "Unknown". Thus, the terminal follows the terminal operation when the SFI_GC-PDCCH indicates "Unknown". For example, referring to FIG. 27(a), if the terminal fails to receive the GC PDCCH in slot n, the terminal assumes that all symbols in slot n to slot n+3 are "Unknown" symbols.

[0231] The terminal is configured to periodically monitor the SFI_US-PDCCH. In this case, the terminal is instructed via RRC signaling with information on whether or not it expects the GC-PDCCH to be transmitted at every monitoring period. Preferably, the information is indicated by 1 bit in the RRC signaling. If the terminal is configured to expect the GC-PDCCH to be transmitted at every monitoring period, the terminal monitors the GC PDCCH at every monitoring period, and if it fails to receive the GC-PDCCH, it assumes that all symbols in the slot indicated by the SFI_GC-PDCCH are "Unknown" symbols. Thus, the terminal follows the terminal operation when the SFI_GC-PDCCH indicates "Unknown" (see FIG. 10).

[0232] On the other hand, if the terminal is configured not to always transmit the GC-PDCCH at each monitoring period, the terminal monitors the GC PDCCH at each monitoring period, but if it fails to receive the GC-PDCCH, it determines all symbols in the slot indicated by the SFI_GC-PDCCH as 'Nothing'. As a result, the symbols in the corresponding slot follow the semi-static allocation (semi-static SFI), the symbol direction of the periodically configured signal, the symbol direction indicated by the SFI_US-PDCCH or US-PDCCH (e.g. DL, UL, Unknown, reserved, or guard period).

[0233] NR supports uplink transmission without UL grant. In this case, the base station notifies the UE of resources available for uplink transmission without UL grant to the RRC or notifies the UE in an L1 signal (e.g., US-PDCCH). Notifying the RRC of resources is called type-1, and notifying the L1 signal is called type-2. The UE assumes the uplink transmission resources notified in type-1 transmission and type-2 transmission as follows. The UE always assumes that the symbols corresponding to the notified uplink resources are UL symbols regardless of the two types. That is, the UL symbols do not change depending on other slot configuration information, for example, information transmitted from SFI_US-PDCCH. Therefore, the UL symbols are considered to be the same as those notified as UL symbols in semi-static UL / DL allocation (semi-static SFI). Alternatively, the UE always assumes that the symbols corresponding to the uplink resources notified in type-1 are UL symbols. On the other hand, if the symbol corresponding to the uplink resource notified by type-2 is located in the resource notified as unknown in the semi-static DL / UL allocation, the uplink resource is changed to the downlink or unknown symbol by SFI_GC-PDCCH, SFI_US-PDCCH as well as the symbol set by RRC to transmit a periodic signal. That is, the terminal operates by regarding the symbol notified by type-1 transmission as the UL symbol notified by semi-static SFI, and operates by regarding the symbol notified by type-2 transmission as the symbol set to transmit and receive a periodic signal (see Table 10).

[0234] A terminal not in RRC connected mode (i.e., a terminal attempting an initial cell connection or a terminal attempting an RRC reconnection) assumes the slot configuration as follows. First, if the terminal fails to receive a synchronization signal or a PBCH, the terminal assumes that all symbols of the cell are DL symbols. If the terminal receives a PBCH and is assigned a CORESET for monitoring a PDCCH for scheduling RMSI (remaining minimum system information), the terminal assumes that the symbols assigned in the CORESET are downlink, and assumes that the remaining symbols without the information are unknown symbols. If the terminal monitors the CORESET and receives a PDCCH for scheduling RMSI, the terminal always determines that the symbols indicated in the PDCCH are DL symbols. If the terminal receives system information via RMSI or later configures PRACH resources for random connection from other system information, the terminal assumes that the PRACH resources are UL symbols. The terminal maintains the determination until it receives semi-static DL / UL assignment or semi-static SFI information. A terminal attempting RRC reconnection may have semi-static DL / UL allocation or semi-static SFI information already configured in the terminal. Therefore, the terminal attempting RRC reconnection assumes that the semi-static DL / UL allocation or semi-static SFI information it has is valid. A terminal attempting RRC reconnection always prioritizes new cell-specific semi-static DL / UL allocation or semi-static SFI information even if there is semi-static DL / UL allocation or semi-static SFI information already configured in a terminal-specific manner.

[0235] FIG. 28 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention.

[0236] As shown, a terminal 100 according to an embodiment of the present invention includes a processor 110 , a communication unit 120 , a memory 130 , a user interface unit 140 , and a display unit 150 .

[0237] First, the processor 110 executes various instructions or programs to process the data inside the terminal 100. Also, the processor 100 controls the overall operation including each unit of the terminal 100 and controls the transmission and reception of data between the units. Here, the processor 110 is configured to perform operations according to the embodiments described in the present invention. For example, the processor 110 receives slot configuration information, determines the configuration of the slot based on it, and performs communication according to the determined slot configuration.

[0238] Next, the communication module 120 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 120 includes a plurality of network interface cards such as cellular communication interface cards 121, 122, and a wireless LAN interface card 123 in an internal or external form. In the drawings, the communication module 120 is shown as an integrated module, but each network interface card may be independently arranged according to the circuit configuration or application different from the drawings.

[0239] The cellular communication interface card 121 transmits and receives wireless signals with at least one of a base station 200, an external device, and a server using a mobile communication network, and provides a cellular communication service in a first frequency band based on the instructions of the processor 110. Here, the wireless signal includes various forms of data or information such as a voice call signal, a video call signal, a text / multimedia message. The cellular communication interface card 121 includes at least one NIC module using an LTE-Licensed frequency band. At least one NIC module independently performs cellular communication with at least one of the base station 200, an external device, and a server according to the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0240] The cellular communication interface card 122 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server using a mobile communication network, and provides a cellular communication service in the second frequency band based on instructions from the processor 110. The cellular communication interface card 122 includes at least one NIC module that uses an LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band is a 2.4 GHz or 5 GHz band.

[0241] The WLAN interface card 123 transmits and receives wireless signals to and from at least one of the base station 200, the external device, and the server using a WLAN connection, and provides a WLAN service in a second frequency band based on instructions from the processor 110. The WLAN interface card 123 includes at least one NIC module that uses a WLAN frequency band. For example, the WLAN frequency band may be an unlicensed radio band such as the 2.4 GHz or 5 GHz band. The at least one NIC module independently performs wireless communication with at least one of the base station 200, the external device, and the server according to a WLAN standard or protocol of the frequency band supported by the corresponding NIC module.

[0242] Next, the memory 130 stores a control program and various data associated therewith used by the terminal 100. Such a control program includes a predetermined program required for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

[0243] Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface 140 receives user input using various input means, and the processor 110 controls the terminal 100 based on the received user input. Also, the user interface 140 performs output based on an instruction of the processor 110 using various output means.

[0244] The display unit 150 then outputs the image on a display screen. The display unit 150 outputs various display objects, such as a user interface, based on the contents or control instructions of the processor 110.

[0245] The base station 200 according to the embodiment of the present invention also includes a processor 210 , a communication module 220 , and a memory 230 .

[0246] First, the processor 210 executes various commands or programs to process data within the base station 200. The processor 210 also controls the overall operation of the base station 200 including each unit, and controls the transmission and reception of data between the units. Here, the processor 210 is configured to perform operations according to the embodiments described in the present invention. For example, the processor 210 signals slot configuration information and performs communication according to the signaled slot configuration.

[0247] Next, the communication module 220 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 120 includes a plurality of network interface cards, such as cellular communication interface cards 221 and 222 and a wireless LAN interface card 223, in an internal or external form. In the drawings, the communication module 220 is shown as an integrated module, but the network interface cards may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0248] The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and provides a cellular communication service through a first frequency band based on an instruction from the processor 210. Here, the wireless signals include various types of data or information, such as a voice call signal, a video call signal, and a text / multimedia message. The cellular communication interface card 221 includes at least one NIC module using an LTE-Licensed frequency band. The at least one NIC module independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol of a frequency band supported by the corresponding NIC module.

[0249] The cellular communication interface card 222 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and provides a cellular communication service in a second frequency band based on an instruction from the processor 210. The cellular communication interface card 222 includes at least one NIC module using an LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band is a 2.4 GHz or 5 GHz band. According to an embodiment of the present invention, the at least one NIC module independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol of a frequency band supported by the corresponding NIC module.

[0250] The wireless LAN interface card 223 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using a wireless LAN connection, and provides a wireless LAN service in a second frequency band based on an instruction from the processor 210. The wireless LAN interface card 223 includes at least one NIC module that uses a wireless LAN frequency band. For example, the wireless LAN frequency band may be an unlicensed radio band such as the 2.4 GHz or 5 GHz band. The at least one NIC module independently performs wireless communication with at least one of the terminal 100, an external device, and a server according to a wireless LAN standard or protocol of the frequency band supported by the corresponding NIC module.

[0251] The terminal 100 and base station 200 shown in Fig. 28 are block diagrams according to an embodiment of the present invention, and the separated blocks are used to logically distinguish the elements of the devices. Thus, the above-mentioned device elements may be mounted on one chip or multiple chips depending on the design of the device. Also, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be selectively provided in the terminal 100. Also, the user interface 140 and the display unit 150 may be additionally provided in the base station 200 as necessary.

[0252] Although the method and system of the present invention has been described with reference to a particular embodiment, some or all of the components and operations of the present invention may be implemented using a computer system having a general-purpose hardware architecture.

[0253] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. Therefore, the above-described embodiments are illustrative and restrictive in all respects. For example, each component described as a single type may be implemented in a distributed form, and each component described as a distributed form may be implemented in a combined form.

[0254] The scope of the present invention is indicated by the claims set forth below rather than by the above detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. [Industrial Applicability]

[0255] The present invention is applied to a wireless system and a communication device therefor (for example, a terminal, a base station). [Explanation of symbols]

[0256] 100 devices 110 Processor 120 Communication Module 121, 122 Cellular communication interface card 123 Wireless LAN Interface Card 130 Memory 140 User Interface Section 150 display units 200 base stations 210 Processor 220 Communication Module 221, 222 Cellular communication interface card 223 Wireless LAN Interface Card 230 Memory

Claims

1. In a user equipment (UE) for use in a wireless communication system, the UE comprises: A communication module; a processor; The processor, Receive a radio resource control (RRC) signal including a slot format configuration regarding a slot format; The slot format configuration provides a number X of downlink symbols and a number Y of uplink symbols; The slot format is configured in the order of 0 or more downlink symbols, 1 or more flexible symbols, and 0 or more uplink symbols, and the 1 or more flexible symbols are identified based on X and Y; Monitoring a group common physical downlink control channel (GC-PDCCH) including slot format information; If a set of symbols configured by a higher layer for the UE to transmit an uplink signal is within the one or more flexible symbols configured by the RRC signal, 1) Whether the GC-PDCCH is detected by the UE; 2) If the GC-PDCCH is detected by the UE, whether the slot format information indicates the set of symbols as uplink; and configured to selectively transmit the uplink signal based on:

2. The user equipment of claim 1 , wherein if the GC-PDCCH is not detected by the UE, the transmission of the uplink signal is cancelled for the set of symbols.

3. 3. The user equipment of claim 1, wherein when the GC-PDCCH is detected by the UE, the transmission of the uplink signal is canceled on the set of symbols when the slot format information indicates the set of symbols as flexible.

4. 4. The user equipment of claim 1, wherein when the GC-PDCCH is detected by the UE, the transmission of the uplink signal is performed on the set of symbols when the slot format information indicates the set of symbols as uplink.

5. The user equipment of claim 1 , wherein the uplink signal comprises a periodic uplink signal.

6. The user equipment of claim 1 , wherein the uplink signals include a Sounding Reference Signal (SRS).

7. The user equipment according to claim 1 , wherein the higher layer comprises an RRC layer.

8. The user equipment of claim 1 , wherein the RRC signal including a slot format configuration is a cell specific signal or a terminal specific signal.

9. 1. A method for use by a user equipment (UE) in a wireless communication system, the UE comprising: receiving a radio resource control (RRC) signal including a slot format configuration relating to a slot format; The slot format configuration provides a number X of downlink symbols and a number Y of uplink symbols; the slot format being configured in the order of zero or more downlink symbols, one or more flexible symbols, and zero or more uplink symbols, the one or more flexible symbols being identified based on X and Y; monitoring a Group Common Physical Downlink Control Channel (GC-PDCCH) including slot format information; If a set of symbols configured by a higher layer for the UE to transmit an uplink signal is within the one or more flexible symbols configured by the RRC signal, 1) whether the GC-PDCCH is detected by the UE; and 2) If the GC-PDCCH is detected by the UE, whether the slot format information indicates the set of symbols as uplink; selectively transmitting the uplink signal based on A method comprising:

10. The method of claim 9, wherein if the GC-PDCCH is not detected by the UE, the transmission of the uplink signal is cancelled for the set of symbols.

11. The method according to claim 9 or 10, wherein, when the GC-PDCCH is detected by the UE, the transmission of the uplink signal is canceled on the set of symbols when the slot format information indicates the set of symbols as flexible.

12. 12. The method according to claim 9, wherein, when the GC-PDCCH is detected by the UE, the transmission of the uplink signal is performed on the set of symbols when the slot format information indicates the set of symbols as uplink.

13. The method of claim 9 , wherein the uplink signal comprises a periodic uplink signal.

14. The method of claim 9 , wherein the uplink signal comprises a Sounding Reference Signal (SRS).

15. The method according to claim 9 , wherein the higher layer comprises an RRC layer.

16. 16. The method of claim 9, wherein the RRC signal including a slot format configuration is a cell specific signal or a terminal specific signal.

Images