Method, apparatus, and system for transmitting and receiving control channel of wireless communication system

Abstract

To provide a method for informing a terminal with information on a slot configuration, a communication method based on slot configuration, and a device therefor.SOLUTION: The method includes a step in which a transmission / reception position of a periodic signal is composed of a first symbol set within each slot that is set periodically, a step of monitoring a PDCCH in order to receive slot configuration information for a first slot on which the transmission / reception position of the periodic signal exists, and a step of performing a process for transmitting / receiving a periodic signal in the first slot. If the first symbol set in the first slot is designated as a flexible symbol by a higher level, the transmission / reception of the periodic signal in the first slot is selectively performed in accordance with the detection result of the PDCCH. The flexible symbol means a symbol whose application is re-designated as DL, UL or flexible in accordance with the slot configuration information of the PDCCH.SELECTED DRAWING: Figure 12

Description

Technical Field

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

Background Art

[0002] The 3GPP NR (3rd Generation Partnership Project New Radio) system improves the spectral efficiency of the network so that a communication operator can provide more data and voice services with a given bandwidth. Therefore, the 3GPP NR system is designed to satisfy the requirements for high-speed data and media transmission in addition to supporting a large volume of voice. The advantages of the NR system are a simple architecture with low operating costs, such as high throughput, low latency, support for FDD (Frequency Division Duplex) and TDD (Time Division Duplex), and an improved end-user environment on the same flat platform.

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

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Non-Patent Documents

[0005] [Non-Patent 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-Patent 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-Patent 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-Patent Document 4] Qualcomm, Offline discussion on GC-PDCCH for SFI [online], 3GPP TSG RAN WG1 adhoc_NR_AH_1709 R1-1716883, Internet: <URL: http: / / www.3gpp.org / ftp / tsg_ran / WG1_RL1 / TSGR1_AH / NR_AH_1709 / Docs / R1-1716883.zip>, September 21, 2017

Non-Patent Document 5

Non-Patent Document 6

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to provide a method for notifying a terminal of information related to slot configuration, a communication method based on slot configuration, and an apparatus therefor.

[0007] The technical problems to be solved by the present invention are not limited to the above technical problems, and other technical problems not mentioned should be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from the following description.

Means for Solving the Problems

[0008] As a first aspect of the present invention, in a method for a terminal to determine the reception of a downlink signal in a wireless communication system, configuration information regarding a periodic signal is received via a higher layer signal, and the reception position of the periodic signal consists of a first symbol set within each periodically set slot, and in order to receive slot configuration information for a first slot where the reception position of the periodic signal exists, a PDCCH (physical downlink control channel) regarding the slot configuration of the first slot is monitored, and a process for receiving the first periodic signal in the first slot is performed, and if the first symbol set within the first slot is designated as a flexible symbol by a higher layer, the reception of the periodic signal in the first slot is selectively performed according to the detection result of the PDCCH, and the flexible symbol means a symbol whose use is re-designated as DL (downlink), UL (uplink), or flexible according to the slot configuration information of the PDCCH, a method is provided.

[0009] As a second aspect of the present invention, in a terminal used in a wireless communication system, including a communication module and a processor, the processor receives configuration information regarding a periodic signal via a higher layer signal, the reception position of the periodic signal consists of a first symbol set within each periodically set slot, and in order to receive slot configuration information for a first slot where the reception position of the periodic signal exists, the PDCCH regarding the slot configuration of the first slot is monitored, and is configured to perform a process for receiving the first periodic signal in the first slot, and if the first symbol set within the first slot is designated as a flexible symbol by a higher layer, the reception of the periodic signal in the first slot is selectively performed according to the detection result of the PDCCH, and the flexible symbol means a symbol whose use is re-designated as DL, UL, or flexible according to the slot configuration information of the PDCCH, a method is provided.

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

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

[0012] In the first and second aspects, the PDCCH includes a GC-PDCCH having a slot configuration related to the first slot. When the first symbol set within the first slot is designated as a flexible symbol by a higher layer, if the 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 is performed only when the slot configuration information detected from the GC-PDCCH indicates the first symbol set as a DL symbol.

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

[0015] As a third aspect of the present invention, in a method for a terminal to determine uplink signal transmission in a wireless communication system, configuration information regarding a periodic signal is received via a higher layer signal, and the transmission position of the periodic signal consists of a first symbol set within each periodically set slot, and to receive slot configuration information for a first slot where the transmission position of the periodic signal exists, monitoring a PDCCH regarding the slot configuration of the first slot, and performing a process for transmitting the first periodic signal in the first slot, and if the first symbol set within the first slot is designated as a flexible symbol by a higher 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 use is re-designated as DL, UL, or flexible according to the slot configuration information of the PDCCH.

[0016] As a fourth aspect of the present invention, a terminal used in a wireless communication system includes a communication module and a processor, and the processor is configured to receive configuration information regarding a periodic signal via a higher layer signal, the transmission position of the periodic signal consists of a first symbol set within each periodically set slot, to receive slot configuration information for a first slot where the transmission position of the periodic signal exists, monitor a PDCCH regarding the slot configuration of the first slot, and perform a process for transmitting the first periodic signal in the first slot, and if the first symbol set within the first slot is designated as a flexible symbol by a higher 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 use is re-designated as DL, UL, or flexible according to the slot configuration information of the PDCCH.

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

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

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

[0020] In the third and fourth aspects, transmission of the periodic signal from the first slot is performed only when the slot configuration information detected from the GC-PDCCH indicates the first symbol set as a UL symbol.

[0021] In the third and fourth aspects, the PDCCH includes a US-PDCCH having uplink scheduling information. When the first symbol set within the first slot is designated as a flexible symbol by a higher layer, if a UL signal is scheduled for the first symbol set by the US-PDCCH, transmission of the periodic signal in the first slot is performed.

Advantages of the Invention

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

[0023] The effects obtained by the present invention are not limited to the above-described effects, and other effects not mentioned should be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from the following description.

Brief Description of the Drawings

[0024]

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Mode for Carrying Out the Invention

[0025] The terms used in this specification are chosen to be as general as currently widely used, taking into account the functions in the present invention, but this may vary depending on the intentions, conventions of those skilled in the art, or the emergence of new technologies. In some specific cases, there are also those arbitrarily selected by the applicant, and in such cases, the meaning is described in the corresponding invention description part. Therefore, it is clarified that the terms used in this specification should be analyzed based not only on the mere names of the terms but also on the substantial meanings they have and the content throughout this specification.

[0026] Throughout the specification, when it is stated that a certain configuration is "connected" to another configuration, this includes not only the case where they are "directly connected" but also the case where they are "electrically connected" with other intervening components therebetween. Also, when a certain configuration "includes" a specific component, this means that, unless otherwise stated to the contrary, it does not exclude other components but further includes other components. In addition, the limiting terms "above" or "below" based on a specific threshold may be appropriately replaced by "more than" or "less than" respectively depending on the embodiments.

[0027] The following technologies are used in various wireless connection systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access). CDMA is implemented by radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented by radio technologies such as GSM (registered trademark) (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM (registered trademark) Evolution). OFDMA is implemented by radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, E-UTRA (Evolved UTRA). UTRA is part of UMTS (Universal Mobile Telecommunication System). 3GPP LTE (Long term evolution) is part of E-UMTS (Evolved UMTS) that uses 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 the 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 the sake of clarity, the description will focus on 3GPP NR, but the technical idea of the present invention is not limited to this.

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

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

[0030] Referring to FIG. 1, the radio frame (or radio frame) used in the 3GPP NR system is 10 ms (Δf max N f / 100)*T c ) in length. Also, the radio frame consists of 10 subframes (Subframe, SF) of equal size. Here, Δf max = 480 * 10 3 HZ, N f = 4096, T c = 1 / (Δf ref * N f、ref )), Δf ref = 15 * 10 3 Hz, N f、ref = 2048. The 10 subframes in one radio frame are each assigned numbers 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, in the 3GPP NR system, the subcarrier spacing that can be used is 15 * 2 μ kHz, where μ is the subcarrier spacing configuration factor and has values of μ = 0, 1, 2, 3, 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz are used as the subcarrier spacing. One subframe with a length of 1 ms contains 2 μ slots. At this time, the length of each slot is 2 -μ ms. The 2 μ slots in one subframe are each numbered from 0 to 2μ Numbers up to -1 are assigned. Also, the slots within one subframe are each numbered from 0 to 10*2 μ Numbers up to -1 are assigned. The time resources are divided by at least one of the radio frame number (or also called radio frame index), subframe number (or also called subframe index), and slot number (or also called slot index).

[0031] FIG. 2 is a diagram showing an example of the downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, FIG. 2 shows the structure of the resource grid of the 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 interval. Unless otherwise specified, an OFDM symbol may be simply referred to as a symbol. Referring to FIG. 2, the signal transmitted from each slot is N size、μ grid、x *N RB SC sub-carriers and is represented by a resource grid consisting of N slot Symb OFDM symbols. Here, if it is a downlink resource grid, x = DL, and if it is an uplink resource grid, x = UL. N size、μ grid、x indicates the number of resource blocks (RBs) according to the sub-carrier spacing configuration factor μ (downlink or uplink according to x), and N slot Symb indicates the number of OFDM symbols within a slot. N RB SC is the number of sub-carriers constituting one RB, and N RB SCIt is 12. The OFDM symbol is referred to as a CP-OFDM (cyclic shift OFDM) symbol or a DFT-s-OFDM (Discrete Fourier transform spreading OFDM) symbol by the multiplexing method. The number of OFDM symbols included in one slot can vary depending on the length of the CP (cyclic prefix). For example, if it is a normal CP, one slot contains 14 OFDM symbols, but if it is an extended CP, one slot contains 12 OFDM symbols. In a specific embodiment, the extended CP is only used at a subcarrier spacing of 60 kHz. In FIG. 2, for convenience of explanation, a slot consisting of 14 OFDM symbols is illustrated, but the embodiments of the present invention are applied in the same way to slots having different numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol has N size、μ grid、x *N RB SC subcarriers in the frequency domain. The types of subcarriers are divided 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] [[ID=...]]RB is defined as N slot Symb consecutive OFDM symbols (e.g., 14) in the time domain and is defined by N RB SC consecutive subcarriers (e.g., 12) in the frequency domain. 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 SCIt consists of resource elements. Each resource element in the resource grid is uniquely defined by an index pair (k, l) within one slot. k is an index given from 0 to N size、μ grid、x *N RB SC -1 in the frequency domain, and l is an index given from 0 to N slot Symb -1 in the time domain.

[0034] On the other hand, one RB is mapped to one Physical Resource Block (PRB) and one Virtual Resource Block (VRB) respectively. A PRB is defined as N slot Symb (for example, 14) consecutive OFDM symbols in the time domain. Also, a PRB is defined by N RB SC (for example, 12) consecutive subcarriers in the frequency domain. Therefore, one PRB consists of N RB SC *N slot Symb 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 that of the base station. This is because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters necessary to perform DL signal demodulation and UL signal transmission at the correct time.

[0036] FIG. 3 is a diagram for explaining physical channels used in a 3GPP system (e.g., NR) and a general signal transmission method using the physical channels. When the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation (S301). Specifically, the terminal synchronizes with the base station in the initial cell search. For this purpose, 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 obtain information such as the cell ID. Thereafter, the terminal receives a Physical Broadcast Channel from the base station and obtains in-cell broadcast information. After 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, thereby obtaining more specific system information than the system information obtained through the initial cell search (S302). If the terminal has not connected to the base station for the first time or there is no radio resource for signal transmission, the terminal performs a random access procedure on the base station (S303 to S306). For this purpose, the terminal transmits a specific sequence as a preamble via a Physical Random Access Channel (PRACH) (S303 to S305) and receives a response message for the preamble from the base station via the PDCCH and the corresponding PDSCH (S304 and S306). In the case of a contention-based RACH, an additional contention resolution procedure is performed. After the above-described procedures, the terminal receives PDCCH / PDSCH as a general uplink / downlink signal transmission procedure (S307) and transmits a Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) (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. Also, the DCI may have different formats depending on the purpose of use of the DCI. The control information transmitted by the terminal to the base station via the uplink or received by the terminal from the base station includes downlink / uplink ACK / NACK signals, CQI (Channel Quality Indicator), PMI (Precoding Matrix Index), RI (Rank Indicator), etc. In the case of the 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 related to an SS / PBCH block for initial cell connection in a 3GPP NR system.

[0038] When the terminal is powered on or attempts to newly connect to a cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. During the initial cell search process, the terminal determines the physical cell identity N of the cell cell IDDetect it. To do so, the terminal receives synchronization signals, such as PSS and SSS, from the base station and synchronizes with the base station. At this time, the terminal obtains information such as cell identifier (identity, ID). Referring to Fig. 4(a), the synchronization signal will be described in more detail. The synchronization signal is divided into PSS and SSS. PSS is used to obtain time-domain synchronization such as OFDM symbol synchronization and slot synchronization, and / or frequency-domain synchronization. SSS is used to obtain frame synchronization and 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, in the first OFDM symbol, 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 from 0. In the first OFDM symbol where PSS is transmitted, the remaining subcarriers, that is, subcarriers 0, 1, ··· 55, 183, 184, ··· 239, are not transmitted by the base station with signals. In the third OFDM symbol where SSS is transmitted, subcarriers 48, 49, ··· 55, 183, 184, ··· 191 are not transmitted by the base station with signals. The base station transmits the PBCH signal to the remaining REs in the SS / PBCH block excluding the above signals.

[0039] [Table 1]

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

[0041]

Number

[0042] Here,

[0043]

Number

[0044] is,

[0045]

Number

[0046] is given by. The SSS is as follows.

[0047]

Number

[0048] Here,

[0049]

Number

[0050] and

[0051]

Number

[0052] is given by

[0053] A radio frame having a 10 ms duration is divided into two half - frames each having a 5 ms duration. Referring to Fig. 4(b), the slots in each half - frame where the SS / PBCH block is transmitted will be described. The slot where the SS / PBCH block is transmitted is one of Case A, B, C, D, E. In Case A, the sub - carrier spacing is 15 kHz, and the starting point of the SS / PBCH block is {2, 8}+14*n symbols. At this time, for carrier frequencies below 3 GHz, n = 0, 1. For carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In Case B, the sub - carrier spacing is 30 kHz, and the starting point of the SS / PBCH block is {4, 8, 16, 20}+28*n. At this time, for carrier frequencies below 3 GHz, n = 1. For carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1. In Case C, the sub - carrier spacing is 30 kHz, and the starting point of the SS / PBCH block is {2, 8}+14*n. At this time, for carrier frequencies below 3 GHz, n = 0, 1. For carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In Case D, the sub - carrier spacing is 120 kHz, and the starting point of the SS / PBCH block is {4, 8, 16, 20}+28*n. At this time, for carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In Case E, the sub - carrier spacing is 240 kHz, and the starting point of the SS / PBCH block is {8, 12, 16, 20, 32, 36, 40, 44}+56*n. At this time, for carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

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

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

[0056] A CORESET is the time - frequency resource in which the PDCCH, which is a control signal of the terminal, is transmitted. Referring to FIG. 6, instead of receiving all frequency bands and attempting to combine the "PDCCH" complex, the terminal receives only the time - frequency resources defined as the CORESET and combines the PDCCH mapped within the CORESET. The base station configures one or more CORESETs for each cell for the terminal. The CORESET consists of up to three consecutive symbols on the time axis. Also, the CORESET is configured continuously or discontinuously in units of 6 PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET#1 consists of consecutive PRBs, and CORESET#2 and CORESET#3 consist of discontinuous PRBs. The CORESET can be located in any symbol within the slot. For example, CORESET#1 in FIG. 5 starts from the first symbol of the slot, CORESET#2 starts from the fifth symbol of the slot, and CORESET#9 starts from the ninth symbol of the slot.

[0057] FIG. 7 is a diagram related to the setting of PDCCH search spaces in a 3GPP NR system. In order to transmit PDCCH to a terminal, there is at least one or more search spaces in each CORESET. In the present invention, a search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) where the PDCCH of a terminal can be transmitted. The search space includes a common search space that all 3GPP NR terminals should commonly search, and a terminal-specific search space that a specific terminal should search. The common search space is set to monitor PDCCHs that are set so that all terminals in cells belonging to the same base station commonly search. The terminal-specific search space is set for each terminal to monitor the PDCCH assigned to each terminal at different search space positions according to the terminal. The terminal-specific search space may be assigned with the search spaces partially overlapping among terminals due to the limited control regions that can be assigned to PDCCHs. Monitoring the PDCCH includes blindly decoding PDCCH candidates in the search space. When the blind decoding is successful, it is expressed that the PDCCH is (successfully) detected / received. When the blind decoding fails, it is expressed that the PDCCH is not detected / not received, or not successfully detected / received.

[0058] For the sake of convenience in description, in order to transmit uplink scheduling information or downlink scheduling information to one or more terminals, a PDCCH scrambled with a group common (GC) RNTI (or common control RNTI, CC-RNTI) that is already known is referred to as a (UE) group common (GC) PDCCH, or a common PDCCH. Also, in order to transmit uplink scheduling information or downlink scheduling information to a specific terminal, a PDCCH scrambled with a user-specific RNTI that the specific terminal already knows is referred to as a user-specific (US) PDCCH.

[0059] The PDCCH notifies each terminal or terminal group of at least one of information regarding resource allocation (DL Grant) of the PCH (Paging channel) and DL-SCH (Downlink-shared channel) which are transport channels, resource allocation (Uplink Grant) of the UL-SCH, and HARQ information. The base station transmits the PCH transport block and the DL-SCH transport block via the PDSCH. The base station transmits data except for specific control information or specific service data via the PDSCH. Also, the terminal receives data except for specific control information or specific service data via the PDSCH.

[0060] The base station includes in the PDCCH and transmits information regarding to which terminal (one or more terminals) the PDSCH data is to be transmitted and how the corresponding terminal should receive and decode the PDSCH. For example, assume that a specific PDCCH is CRC masked with an RNTI "A" and information regarding the data transmitted using a radio resource "B" (e.g., frequency position) and a DCI format "C", i.e., transmission format information (e.g., transmission block size, modulation method, coding information), etc., is transmitted via a specific subframe. In this case, the terminals in the cell monitor the PDCCH using the RNTI information they possess. If there is one or more terminals with the "A" RNTI, the corresponding terminals receive the PDCCH and receive the PDSCH indicated by "B" and "C" via the information of the received PDCCH.

[0061] Table 2 relates to the PUCCH (physical uplink control channel) 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: Response to the PDCCH (indicating DL SPS release) and / or response to the downlink data packet on the PDSCH. It indicates whether the PDCCH or PDSCH has been successfully received. The HARQ-ACK response includes positive ACK (simply ACK), negative ACK (hereinafter NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ ACK / NACK, ACK / NACK. Generally, ACK is represented as 1 and NACK is represented as 0. -CSI (Channel State Information): Feedback information for the downlink channel. It is generated by the terminal based on the CSI-RS (Reference Signal) transmitted by the base station. The MIMO (Multi Input Multi 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 for transmitting 1-bit or 2-bit HARQ-ACK information. PUCCH format0 is transmitted via 1 OFDM symbol or 2 OFDM symbols on the time axis and 1 PRB on the frequency axis. If PUCCH format0 is transmitted with 2 OFDM symbols, the same sequence is transmitted on different PRBs for the two symbols. Through this, the terminal obtains a frequency diversity gain. More specifically, the terminal transmits M bit bits UCI (M bitDetermine the value m of the cyclic shift according to (m = 1 or 2), and cyclically shift the base sequence of length 12 by the determined value m cs and map the cyclically shifted sequence to 12 REs of 1 PRB of 1 OFDM symbol for transmission. The number of cyclic shifts available for the terminal is 12, and if M cs = 1, when the terminal transmits UCI0 and UCI1, the terminal arranges the difference between the values of the two cyclic shifts to be 6. Also, if M bit = 2 and the terminal transmits UCI00, UCI01, UCI11, UCI10, the terminal arranges the difference between the values of the four cyclic shifts to be 3. bit

[0066] PUCCH format1 transmits 1-bit or 2-bit HARQ-ACK information. PUCCH format1 is transmitted in 1 PRB on the frequency axis and in OFDM symbols consecutive on the time 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. More specifically, if M bit = 1, the UCI is BPSK modulated. The terminal bit = 2 modulates the UCI by QPSK (Quadrature Phase Shift Keying) to generate a complex valued symbol d(0), and multiplies the generated d(0) by a sequence of length 12 to obtain a signal. The terminal spreads the obtained signal with time-axis OCC (orthogonal cover code) on the even-numbered OFDM symbol to which PUCCH format1 is assigned for transmission. PUCCH format1 determines the maximum number of different terminals multiplexed on the same PRB according to the length of the OCC used. DMRS (Demodulation RS) is spread and mapped to the OCC on the last OFDM symbol of PUCCH format1.

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

[0068] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted via consecutive OFDM symbols on the time axis and 1 PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is any one of 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14. Specifically, the terminal bit bits UCI (M bit > 2) is modulated with π / 2-BPSK (Binary Phase Keying) or QPSK to generate complex symbols d(0), ···, d(M symb - 1). 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 a length-12 PreDFT-OCC so that PUCCH format 4 has two or four multiplexing capacities. The terminal transmit precodes (or DFT-precodes) the spread signal, maps it to each RE, and transmits the spread signal.

[0069] At this time, the number of PRBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format 2, the terminal transmits both HARQ-ACK information and CSI information via PUCCH. If the number of PRBs available for the terminal to transmit is greater than the maximum number of PRBs that can be used by PUCCH format 2, PUCCH format 3, or PUCCH format 4, 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 format 1, PUCCH format 3, or PUCCH format 4 is configured via an RRC signal to indicate frequency hopping within a slot. When frequency hopping is configured, the PRB indexes for frequency hopping are configured by the RRC signal. If PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over the 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 format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted in multiple slots. At this time, the number of slots K in which PUCCH is repeatedly transmitted is configured by the RRC signal. The repeatedly transmitted PUCCH should start from the OFDM symbol at the same position within each slot and have the same length. If even one of the OFDM symbols of the OFDM symbols in the slot where the terminal should transmit PUCCH is indicated as a DL symbol by the RRC signal, the terminal does not transmit PUCCH in the corresponding slot and extends the transmission to the next slot.

[0072] In the 3GPP NR system, the terminal performs transmission and reception using a bandwidth smaller than or the same as that of the carrier (or cell). For this purpose, 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 a maximum of four 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 a maximum of four DL BWPs for the downlink carrier (or cell) and a maximum of four 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 in 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 instruct the terminal to move from one BWP to another. The terminal moving from one BWP to another indicates that the BWP used by the terminal is deactivated and a new BWP is activated. In a carrier (or cell) operating in TDD, the base station includes a BPI (Bandwidth part indicator) that indicates the BWP to be activated in the DCI that schedules PDSCH or PUSCH in order to change the DL / UL BWP pair of the terminal. The terminal receives the DCI that schedules PDSCH or PUSCH and identifies the DL / UL BWP pair to be activated based on the BPI. In the case of a downlink carrier (or cell) operating in FDD, the base station includes a BPI that notifies the BWP to be activated in the DCI that schedules 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 that indicates the BWP to be activated in the DCI that schedules PDSCH to change the UL BWP of the terminal.

[0074] Hereinafter, the carrier aggregation technique will be described. FIG. 6 is a conceptual diagram for explaining carrier aggregation.

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

[0076] Referring to FIG. 8, as an example of a 3GPP NR system, the overall system bandwidth includes up to 16 component carriers, and each component carrier has a bandwidth of up to 400 MHz. A component carrier includes one or more consecutive sub-carriers that are physically continuous. FIG. 8 shows that each component carrier has the same bandwidth, but this is merely an illustration, and each component carrier may have a different bandwidth. Also, although it is shown that each component carrier is adjacent to each other on the frequency axis, the drawing is shown in a logical outer surface, and each component carrier may be physically adjacent to each other or may be separated from each other.

[0077] In each component carrier, different center frequencies are used. Also, in physically adjacent component carriers, one common center carrier is used. In the embodiment of FIG. 8, assuming that all component carriers are physically adjacent to each other, center carrier A is used for all component carriers. Also, assuming that each component carrier is not physically adjacent to each other, center carrier A and center carrier B are used for each component carrier.

[0078] If the overall system bandwidth is extended by carrier aggregation, the frequency band used for communication with each terminal is defined in units of component carriers. Terminal A can use 100 MHz, which is the overall system bandwidth, and communicates using all five component carriers. Terminals B1 to B5 can only use a bandwidth of 20 MHz and communicate using one component carrier. Terminals C1 and C2 can only use a bandwidth of 40 MHz and communicate using two component carriers each. The two component carriers may or may not be logically / physically adjacent. Terminal C1 shows the case of using two non-adjacent component carriers, and Terminal C2 shows the case of using two adjacent component carriers.

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

[0080] Referring to FIG. 9(a), a general wireless communication system performs data transmission or reception via one DL band and one corresponding UL band (in the case of the frequency division duplex (FDD) mode). In other specific embodiments, the wireless communication system divides a radio frame in the time domain into an uplink time unit and a downlink time unit, and performs data transmission or reception via the uplink / downlink time unit (in the case of the time division duplex (TDD) mode). Referring to FIG. 9(b), three 20 MHz CCs are aggregated in UL and DL respectively to support a bandwidth of 60 MHz. Each CC is adjacent or non-adjacent to each other in the frequency domain. FIG. 9(b) shows, for convenience, the case where the bandwidths of the UL CC and the DL CC are both the same and symmetric, but the bandwidth of each CC may be determined independently. Also, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CCs limited to a specific UE via RRC are referred to as the configured serving UL / DL CCs in a specific UL.

[0081] The base station activates some or all of the serving CCs configured in the terminal, or deactivates some CCs, and uses them for communication with the terminal. The base station changes the CCs to be activated / deactivated and changes the number of CCs to be activated / deactivated. When the base station allocates the CCs available to the terminal on a cell-specific or terminal-specific basis, at least one of the CCs once allocated is not deactivated unless the CC allocation for the terminal is completely reconfigured or the terminal performs a handover. One CC that is not deactivated in the terminal is called the Primary CC (PCC), and the CCs that the base station can freely activate / deactivate are called the Secondary CCs (SCCs). The PCC and SCCs may be classified based on control information. For example, specific control information may be set to be transmitted and received only via a specific CC, and such a specific CC may be called the PCC, and the remaining CC(s) may be called the SCC(s).

[0082] On the other hand, 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), that is, a combination of DL CCs and UL CCs. 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 the DL resources (or DL CCs) and the carrier frequency of the UL resources (or UL CCs) is indicated by the system information. In the case of a UE in the RRC_CONNECTED state but with carrier aggregation not configured or not supported, there is only one serving cell composed only of the PCell.

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

[0084] FIG. 10 is a diagram showing an example to which a cross-carrier scheduling technique is applied. In particular, in FIG. 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 (that is, a Primary Cell, PCell), and the remaining component carriers #1 and #2 are secondary component carriers (that is, Secondary Cells, SCell).

[0085] In the present invention, a method for effectively managing uplink resources for a primary component carrier (primary component carrier or Primary Cell or PCell) or a secondary component carrier (secondary component carrier or SCell) while a terminal is performing a carrier aggregation operation is proposed. Hereinafter, the case where a terminal operates by combining two component carriers will be described, but it is obvious that it is also applicable to the case of combining three or more component carriers.

[0086] FIGS. 9 to 10 mainly illustrate the subframe structure of the 3GPP LTE-A system, but it is also applicable to the 3GPP NR system. In the 3GPP NR system, the subframes in FIGS. 9 to 10 may be replaced by slots.

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

[0088] Embodiment 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 (Layer1) (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 its usage purpose, 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. A part / whole of the Unknown symbols in the slot is 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, the slot contains a plurality of symbols, and each symbol is a DL symbol, an Unknown symbol, or a UL symbol. Although the slot contains 14 symbols as shown in FIG. 2, for the convenience of explanation, it is assumed that the number of symbols is 7. The Unkown in FIG. 11 is understood to be a symbol for ensuring the DL-UL switching gap. In the case of FIG. 11, eight slot configurations (formats) are defined. Slot configuration 0 consists entirely of downlink OFDM symbols. Slot configuration 1 consists of six downlink symbols and one Unknown symbol. Slot configuration 2 consists of five downlink symbols, one Unknown symbol, and one uplink symbol. Slot configuration 3 consists of four downlink symbols, one Unknown symbol, and two uplink symbols. Slot configuration 4 consists of three downlink symbols, one Unknown symbol, and three uplink symbols. Slot configuration 5 consists of 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. In the present invention, for the convenience of explanation, slot configuration 0 is referred to as a DL-only slot, and slot configuration 7 is referred to as a UL-only slot. The slot structure in FIG. 11 is extended and used for slots consisting of 12 or 14 OFDM symbols. Also, in the slot structure of FIG. 11, one slot contains one or more Unknown symbols.

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

[0092] As a first method of notifying a terminal of slot configuration information, the base station notifies the terminal of semi-static DL / UL allocation information. Here, the semi-static DL / UL allocation information includes information regarding the DL / UL configuration within a slot, which is referred to as 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., transmitted by a system information block or cell-specific RRC information), or transmits it via a terminal-specific RRC signal. If the terminal receives the semi-static DL / UL allocation information (or semi-static SFI), it can later know what slot configuration the slot(s) have. The semi-static SFI includes slot configuration information for a set of slots corresponding to a slot configuration period, and the slot configuration information is repeatedly applied in units of slot sets. The semi-static DL / UL allocation information (or semi-static SFI) includes information regarding slot configuration, e.g., whether each symbol in a 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 symbols for which the semi-static DL / UL allocation information (or semi-static SFI) is not indicated are indicated as "Unknown".

[0093] As an example of 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 the configuration of one slot has the order of DL symbols, Unknown symbols, and UL symbols, and the number of DL symbols, N, in each slot DL is notified. The terminal knows the number of Unknown symbols, N, in that slot via another RRC signal Unknown . The terminal determines that the number of UL symbols in that slot is max(0, N symbol - N DL - N Unknown ). Here, N symbolis the number of overall 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 via the other RRC signal is the same as the number of symbols corresponding to the GAP for DL-UL switching of the terminal. Incidentally, if the number of bits required to indicate the semi-static DL / UL allocation information (or semi-static SFI) of one slot in the said manner is K, then when N symbol = 14, since the possible value of N DL is one of the values 0, 1, ···, 14, K can be 4.

[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 the configuration of one slot has the order of DL symbols, Unknown symbols, and UL symbols, and the number of DL symbols, N DL and the number of Unknown symbols, N Unknown of each slot are notified. The terminal determines that the number of UL symbols in that slot is max(0, N symbol - N DL - N Unknown ). Here, N symbol is the number of overall symbols included in one slot, and max(x, y) is a function that returns the larger value of x and y. Assuming that the base station uses two N Unknown s, if the number of bits required to indicate the semi-static DL / UL allocation information (or semi-static SFI) of one slot in the said manner is K, then when N symbol = 14, since 4 bits are required to indicate the possible values of N DL which are 0, 1, ···, 14, and 1 bit is required to indicate the two N Unknown values, K can be 5.

[0095] As an example 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 the configuration of one slot has the order of DL symbols, Unknown symbols, and UL symbols, and the number of DL symbols, N DL and the number of UL symbols, N UL are notified. The terminal determines that the number of Unknown symbols in that slot is max(0, N symbol -N DL -N UL ). Here, 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. If the number of bits required to indicate the semi-static DL / UL allocation information (or semi-static SFI) of one slot in the above manner is K, when N symbol =14, assuming that 0, 1, ···, 14 are used for N DL and 0, 1, ···, 14 are used for N UL , K can be 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 the configuration of one slot has the order of DL symbols, Unknown symbols, and UL symbols, and notify X and Y corresponding to the number of DL symbols and UL symbols. Further, it is notified whether it is a UL-centric slot format or a DL-centric slot format via 1 bit. Here, the range that X can have is larger than the range that Y can have. For example, X may have a value of X min ~N symbol , and Y may have a restricted value such as 0~Y max . Here, X min is greater than or equal to 0, and is less than or equal to N symbol . Preferably, X min =7. Here, Y max is greater than or equal to 0, and is less than or equal to X min . Preferably, Y max= 7. If an additional 1 bit indicates that it is a DL-centric slot, then N DL = X, and N UL = Y. If an additional 1 bit indicates that it is a UL-centric slot, then N DL = Y, and N UL = X. The number of Unkown symbols in a slot for the terminal is obtained by max(0, N symbol - N DL - N UL ). Here, 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. Let the number of bits required to indicate the semi-static DL / UL allocation information (or semi-static SFI) of one slot in the above manner be K. When N symbol = 14, assuming X = 7, 8, 9, 10, 11, 12, 13, 14 and Y = 0, 1, 2, 3, 4, 5, 6, 7, 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 can be obtained.

[0097] As an embodiment of the present invention, as another method for signaling semi-static DL / UL allocation information (or semi-static SFI), the base station and the terminal always assume that the configuration of one slot has the order of DL symbols, Unknown symbols, and UL symbols, and notify the starting point and the length of the symbols occupied by the Unknown symbols within one slot. Specifically, let the number of symbols in the slot be N symbol and N start be the position of the OFDM symbol where the Unknown symbol starts in the slot, and L symbols be the number of continuously allocated Unknown symbols. Also, assume that the position of the OFDM symbol starts from 0. In one slot, the value for notifying the information that the Unknown symbol is allocated, SIV (Symbol indication value), is determined as follows.

[0098]

Number

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

[0100] On the other hand, by adding an additional value to the SIV value, it is possible to indicate that a slot consists of only DL symbols or only UL symbols. For example, to indicate a slot consisting of only DL symbols, SIV = N symbol *(N symbol +1) / 2 can be indicated. To indicate a slot consisting of only UL symbols, SIV = N symbol *(N symbol +1) / 2 + 1 can be indicated. As another example, to indicate a slot consisting of only UL symbols, SIV = N symbol *(N symbol +1) / 2 can be indicated. To indicate a slot consisting of only DL symbols, SIV = N symbol *(N symbol +1) / 2 + 1 can be indicated. In this method, SIV is between 0 and Nsymbol *(N symbol +1) / 2 + 1. Thus, the required number of bits is ceil(log2(N symbol *(N symbol +1) / 2 + 2)). Here, ceil(x) is a function that returns the smallest integer greater than or equal to x. Thus, if N symbol = 14, 7 bits are required.

[0101] On the other hand, some of the SIV values between 0 and N symbol *(N symbol +1) / 2 + 1 are analyzed as indicating that one slot consists entirely of DL symbols only. 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 analyzed 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 analyzed as indicating a slot consisting entirely of DL symbols.

[0102] When indicating the slot configuration using the SIV method, as a method for reducing the bits used in the SIV, the position of the symbol where Unknown can be located is restricted. For example, if there are a total of N symbol symbols in one slot, it may be restricted that Unknown can 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 B - A + 1 symbols between OFDM symbol A and OFDM symbol B. For example, if A = 6 and B = 11, the SIV value is represented from 0 to 20, and 5 bits are required.

[0103] When instructing the slot configuration using the SIV method, as a method for reducing the number of bits used in the SIV, the granularity of the symbols occupied by Unknown is restricted. As described above, the symbol occupied by Unkown was in units of 1 symbol, and this can be extended to units of P symbols. The SIV notifies the start position and the consecutive number of a group of Unknown symbols bundled in P. For example, if P = 2, the number of bits required for the SIV is reduced to 5 bits.

[0104] As yet another method of signaling semi-static DL / UL allocation information (or semi-static SFI), assume that a slot consists of two sub-slots, and the base station and the terminal always have the order of DL symbols, Unknown symbols, and UL symbols in each sub-slot. As a method of notifying the configuration of each sub-slot, the SIV method is used. That is, it notifies the start position and the end position of the UL symbol in each sub-slot. Specifically, let the number of symbols in the sub-slot be N sub-symbol and, N sub-start be the position of the OFDM symbol at which the Unknown symbol starts in the sub-slot, and L sub-symbols be the number of consecutively allocated OFDM symbols. Also assume that the position of the OFDM symbol starts from 0. In one sub-slot, the value SIV for notifying the information that the Unknown symbol is allocated is determined as follows.

[0105]

Number

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

[0107] On one hand, an additional value can be added to the SIV value to indicate that one sub - slot consists of only DL symbols or only UL symbols. For example, to indicate a sub - slot consisting of only DL symbols, SIV = N sub-symbol *(N sub-symbol +1) / 2 can be indicated. To indicate a sub - slot consisting of only UL symbols, SIV = N sub-symbol *(N sub-symbol +1) / 2+1 can be indicated. As another example, to indicate a sub - slot consisting of only UL symbols, SIV = N sub-symbol *(N sub-symbol +1) / 2 can be indicated. To indicate a sub - slot consisting of only DL symbols, SIV = N sub-symbol *(N sub-symbol +1) / 2+1 can be indicated. Therefore, the number of bits required to indicate the sub - slot format is N sub-symbol *ceil(log2(N sub-symboll *(N sub-symbol +1) / 2+2)) bit. Here, ceil(x) is a function that returns the smallest integer greater than or equal to x. Thus, if N symbol =14 and N sub-symbol =7, 5 bits are required per sub - slot and 10 bits are required for one slot.

[0108] On the other hand, some of the SIV values between 0 and N sub-symbol *(N sub-symbol +1) / 2 - 1 are parsed as indicating that one sub - slot consists of only 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 parsed as indicating a sub - slot consisting of only 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 parsed as indicating a sub - slot consisting of only DL symbols.

[0109] When one slot consists of two sub - slots, the slot configuration information of one slot is represented and transmitted by the configuration information of the two sub - slots. That is, 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 whole slot via SIV1 and SIV2. Incidentally, SIV1 and SIV2 are jointly encoded and transmitted. As an example of joint encoding, the slot configuration information is expressed in the form of SIV joint-encoding =SIV1*Q + SIV2. At this time, Q is a value one greater than the largest value that SIV2 can have. The terminal obtains SIV2 via the remainder of dividing SIV joint-encoding by Q, and obtains SIV1 via (SIV joint-encoding - SIV2) / Q.

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

[0111] As a second method of notifying the terminal of the slot configuration information, SFI, that is, information regarding 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 GC - PDCCH. Here, the GC - PDCCH with SFI is scrambled with a new GC - RNTI for the purpose of distinguishing it from the conventional GC - PDCCH. For convenience, this is referred to as SFI - RNTI. Hereinafter, the SFI transmitted via 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 regarding 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 regarding the current slot configuration in which the SFI_GC-PDCCH is detected. Further, the slot configuration information transmits, at once, information regarding the configuration of the next slot(s) in addition to the current slot configuration in which the SFI_GC-PDCCH is detected, or transmits information indicating that the current slot configuration has the same configuration up to several next slots, or conveys the configuration information of the current slot and the next slot.

[0113] To inform the terminal of the slot format via SFI_GC-PDCCH, the base station pre-informs the terminal 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 the SFI_GC-PDCCH and know the slot format is pre-configured with the terminal-specific RRC signal. The method of informing the terminal of the slot formats that can be indicated by SFI_GC-PDCCH with the terminal-specific RRC signal is a method of informing whether each symbol is a DL symbol, a UL symbol, or an Unknown symbol, and is an SIV method of informing the slot configuration information in the above-described semi-static DL / UL allocation information (or semi-static SFI) method. As another method, as a method of informing 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), the SFI_GC-PDCCH informs whether the five "Unknown" symbols are DL, UL, or "Unknown". Next, the slot format of the SFI_GC-PDCCH is pre-defined between the base station and the terminal.

[0114] Table 3 illustrates the SFI_GC-PDCCH that the base station indicates 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] The SFI_GC-PDCCH includes information on 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 terminal analyzes 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 a plurality of slot formats pre-specified by the RRC signal. "Slot_index_offset" is not indicated by the SFI_GC-PDCCH but is pre-configured at the RRC layer. The terminal uses the "Slot_index_offset" value pre-configured by the RRC layer to analyze the SFI_GC-PDCCH.

[0118] When the terminal notifies 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 terminal analyzes the SFI_GC-PDCCH as follows. If the SFI_GC-PDCCH is received in slot n, k slots starting 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 a plurality of slot formats pre-specified by the RRC signal.

[0119] When the terminal notifies multiple slot configuration information, the SFI_GC-PDCCH includes / indicates multiple "Slot_format_index". If the SFI_GC-PDCCH has [i1, i2, ···, i jIf a value corresponding to ] is indicated, the terminal analyzes the SFI_GC-PDCCH as follows. If the SFI_GC-PDCCH is received in slot n, slots n to n + k - 1 follow slot format i1, slot format i2, ···, slot format i j in sequence. Here, slot formats i1, ···, i j are the i1, ···, i j th slot formats in Table 3, or among the multiple slot formats specified in advance by the RRC signal, the i1, ···, i j 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". If the SFI_GC-PDCCH indicates Slot_numbers = k and a value corresponding to [i1, i2, ···, i j for Slot_format_index, the terminal analyzes the SFI_GC-PDCCH as follows. If the SFI_GC-PDCCH is received in slot n, from slot n to slot n + j * k - 1, [slot format i1, slot format i2, ···, slot format i j is repeated k times. As another analysis, if j is a divisor of k, from slot n to slot n + k - 1, [slot format i1, slot format i2, ···, slot format i j is repeated k / j times. Here, slot formats i1, ···, i j are the i1, ···, i j th slot formats in Table 3, or among the multiple slot formats specified in advance by the RRC signal, the i1, ···, i j th slot format.

[0121] When the terminal notifies multiple slot configuration information, SFI_GC-PDCCH includes / indicates "Slot_numbers" and multiple "Slot_format_index". When SFI_GC-PDCCH indicates Slot_numbers = k and [i1, i2, ···, i j for Slot_format_index, the terminal analyzes the SFI_GC-PDCCH as follows. If the SFI_GC-PDCCH is received in slot n, then slots n to n + k - 1 are slot format i1, slots n + k to n + 2*k - 1 are slot format i2, ···, slots n + (j - 1)*k to n + j*k - 1 are slot format i j according to. As another analysis, if j is a divisor of k, then slots n to n + k / j - 1 are slot format i1, slots n + k / j to n + 2*k / j - 1 are slot format i2, ···, slots n + (j - 1)*k / j to n + k - 1 are slot format i j according to. Here, slot formats i1, ···, i j are the i1, ···, i j th slot formats in Table 3, or the i1, ···, i j th slot formats among the multiple slot formats specified in advance by the RRC signal.

[0122] When the terminal notifies multiple slot configuration information, SFI_GC-PDCCH includes / indicates multiple "Slot_format_index" and multiple "Applied_slot_fo rmat_index". When SFI_GC-PDCCH indicates Slot_format_index = [i1, i2, ···, i j and 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, then slot n is slot format i a(1) , slot n + 1 is slot format ia(2) , ···, Slot n + k - 1 follows slot format i a(k) . Here, a(1), ···, a(k) have one value among the values of 1, ···, j. Here, slot formats i1, ···, i j are the i1, ···, i j - th slot formats in Table 3, or the i1, ···, i j - th slot formats among a plurality of slot formats specified in advance by the RRC signal.

[0123] When the terminal notifies a plurality of slot configuration information, SFI_GC - PDCCH includes / indicates a plurality of "Slot_format_index" and a plurality of "Applied_slot_index". If SFI_GC - PDCCH indicates Slot_format_index = [i1, i2, ···, i j ], Applied_slot_index = [b(1), b(2), ···, b(j)], the terminal analyzes SFI_GC - PDCCH as follows. If SFI_GC - PDCCH is received in slot n, slot n + b(1) follows slot format i1, slot n + b(2) follows slot format i2, ···, slot n + b(j) follows slot format i j . Here, b(1), ···, b(j) increase sequentially and each has a non - negative integer value. That is, b(1) < b(2) < ··· < b(j). Also, slot formats i1, ···, i j are the i1, ···, i j - th slot formats in Table 3, or the i1, ···, i j - th slot formats among a plurality of slot formats specified in advance by the RRC signal.

[0124] When the terminal notifies a plurality of slot configuration information, SFI_GC-PDCCH includes / indicates a plurality of "Slot_format_index" and a plurality of "Applied_slot_index". When SFI_GC-PDCCH indicates Slot_format_index = [i1, i2, ···, i j , Applied_slot_index = [b(1), b(2), ···, b(j)], the terminal analyzes the SFI_GC-PDCCH as follows. If SFI_GC-PDCCH is received in slot n, slot n + b(1) is slot format i1, slot n + b(1) + b(2) is slot format i2, ···, slot n + b(1) + b(2) + ··· + b(j) is slot format i j . Here, b(1), ···, b(k) each have one of non-negative integer values. As another analysis, if SFI_GC-PDCCH is received in slot n, slot n - 1 + b(1) is slot format i1, slot n - 1 + b(1) + b(2) is slot format i2, ···, slot n - 1 + b(1) + b(2) + ··· + b(j) is slot format i j . Here, b(1), ···, b(k) each have natural number values. Slot formats i1, ···, i j are the i1, ···, i j -th slot formats in Table 3, or the i1, ···, i j -th slot formats among a plurality of slot formats specified in advance by the RRC signal.

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

[0126] In the above method, the slot may be described in contrast to a slot including at least one Unknown symbol configured with semi-static SFI. That is, the slot format indicated by the SFI_GC-PDCCH is sequentially applied to the slots including at least one Unknown symbol configured with semi-static SFI.

[0127] As a third method of notifying the terminal of the slot configuration information, the configuration of the slot scheduled using the DCI of the US-PDCCH can be known. For example, if the DCI contains DL signal or channel (e.g., PDSCH or CSI-RS) scheduling information, the terminal assumes that the symbol in the slot where the DL signal or channel is scheduled is a DL symbol. Not limited to this, the DCI may contain information regarding the start position and length of the PDSCH. Also, if the DCI contains UL signal or channel (e.g., PUSCH or SRS) scheduling information, the terminal assumes that the symbol in the slot where the UL signal or channel is scheduled is a UL symbol. Not limited to this, the DCI may contain information regarding the start position and length of the PUSCH. The (DL / UL grant) DCI is DCI scrambled with 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. SFI_US-PDCCH provides configuration information regarding the OFDM symbol(s) scheduled in the slot. Although signals and channels are described separately in this specification to assist in understanding the invention, signals generally include signals transmitted via channels, and signals / channels are collectively 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 know 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 know such information, and performs rate matching according to the scheduling information to receive the PDSCH. 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 (where k is an integer greater than or equal to 1) after the SFI_US-PDCCH is transmitted, or may be the slots from the n-th slot in which the SFI_US-PDCCH is transmitted to n + L - 1 (where L, assuming slot aggregation, means the number of slots in which the PDSCH allocated to the terminal is transmitted). The index of the slot in which the PDSCH is scheduled for the terminal is transmitted from the SFI_US-PDCCH that schedules the PDSCH. Therefore, the terminal assumes that the symbol in which the PDSCH is formed is a DL symbol.

[0129] Referring to FIG. 14, in the SFI_US-PDCCH in which the base station transmits uplink scheduling information, the start OFDM symbol index and the end OFDM symbol index of the PUSCH, or information that can know 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 PUSCH, or information that can know such information, and receives the PUSCH by rate-matching according to the scheduling information. Referring to FIG. 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)th slot after the SFI_US-PDCCH is transmitted (where k is an integer of 1 or more), or from the (n + k)th slot (where k is an integer greater than 0) in which the SFI_US-PDCCH is transmitted to the (n + k + L - 1)th slot (where L means the number of slots in which the PUSCH assigned 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. Therefore, 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 divided into two steps for transmission. 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 in pairs, 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 pairs 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 for 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] Referring to FIGS. 15 and 16, when a terminal assigned a DL-only slot (e.g., slot n+k) knows that the next slot (e.g., slot n+k+1) consists of UL-only slots, the last G OFDM symbols of the DL-only slot are punctured or not received. Here, G is the gap between DL and UL, which may be different for each terminal or cell, or may be a value known in advance to the terminal and the base station. G is expressed in terms of the number of OFDM symbols or a fixed time interval.

[0133] Referring to FIG. 17, at the time of being scheduled (e.g., slot n), a terminal 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, and the GC-PDCCH is transmitted / received in the slot immediately preceding the assigned UL-only slot (e.g., slot n+k). At this time, the GC-PDCCH in the slot immediately preceding the UL-only slot (e.g., slot n+k) notifies the slot configuration before the UL-only slot, and the terminal uses the slot configuration information of the GC-PDCCH received from the slot immediately preceding the UL-only slot (e.g., slot n+k) to know whether the slot immediately preceding the UL-only slot (e.g., slot n+k) is a DL-only slot.

[0134] Referring to FIG. 18, when the terminal is scheduled (e.g., at slot n), it 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 carrying scheduling information, and a GC-PDCCH is transmitted / received at at least one of the slots before the assigned UL-only slot (e.g., slots n + k, n + k - 1, ···) (e.g., slot n + k - i). In this case, the GC-PDCCH notifies the slot configuration immediately before the UL-only slot (e.g., slot n + k + 1), and the terminal uses the slot configuration information of the GC-PDCCH received from the closest slot 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] Referring to FIGS. 17 and 18, when a terminal assigned a UL-only slot knows that the previous slot consists of DL-only slots, it either punctures or does not transmit the first G OFDM symbols of the UL-only slot. Here, G is the gap between DL and UL, which may be a different value for each terminal or cell, or may be a value that is different for each cell and is known in advance by the terminal and the base station. G is expressed in terms of the number of OFDM symbols or a certain time interval. As an example, if G has different values for each terminal, G is determined using the 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] Embodiment 2: Slot Configuration Information Override As described above, there are three ways to notify the terminal 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 RRC signals, and SFI_GC-PDCCH and SFI_US-PDCCH are slot configuration information consisting of L1 signals. The semi-static SFI contains information indicating whether the symbols of a slot are DL symbols, UL symbols, or Unknown symbols. The SFI_GC-PDCCH contains information indicating whether the symbols of a slot are DL symbols, UL symbols, or Unknown symbols. The SFI_US-PDCCH contains information indicating whether the symbols of a slot are DL symbols or UL symbols. When the terminal receives RRC signals and L1 signals, it should determine which symbol among DL symbols, UL symbols, and Unknown symbols the symbols of the slot are, and should determine whether signal transmission is possible according to the determined symbols.

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

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

[0139] Referring to FIGS. 13 and 19, the base station includes slot configuration information for (i) only the current slot, (ii) configuration information regarding the current slot and the next slot, or (iii) slot configuration information for the current slot and the next N slots via SFI_GC-PDCCH. The terminal is configured to know the configuration of the current slot or the N slot configurations after the current slot when receiving SFI_GC-PDCCH according to the slot configuration information transmitted from SFI_GC-PDCCH. Here, N is an integer of 1 or more. N is dynamically changed, set in RRC, or dynamically indicated by the base station to the terminal within a set set in RRC. Referring to FIG. 19, when SFI_GC-PDCCH transmits a plurality of slot configuration information, the slot configuration information of one slot is transmitted by a plurality of SFI_GC-PDCCHs. As an example of the present invention, if the terminal receives a plurality of SFI_GC-PDCCHs regarding the configuration information of one slot from the base station, the base station and the terminal operate as follows. - Use the information of the SFI_GC-PDCCH that was most recently successfully received among the plurality of SFI_GC-PDCCHs to determine a DL symbol, a UL symbol, or an Unknown symbol and receive a downlink transmission or perform an uplink transmission. That is, if the reception of one of the plurality of SFI_GC-PDCCHs is successful, use the information of that SFI_GC-PDCCH to determine a DL symbol, a UL symbol, or an Unknown symbol. That is, it is assumed that a plurality of SFI_GC-PDCCHs for one slot indicate the same configuration of a DL symbol, a UL symbol, or an Unknown symbol. - Use the information of the SFI_GC-PDCCH configured to be received most recently among multiple SFI_GC-PDCCHs to determine whether to receive a downlink transmission or perform an uplink transmission by determining a DL symbol, a UL symbol, or an Unknown symbol. That is, if the reception of the most recent SFI_GC-PDCCH among multiple SFI_GC-PDCCHs is successful, use the information of that SFI_GC-PDCCH to determine a DL symbol, a UL symbol, or an Unknown symbol. The terminal 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 receiving GC-PDCCH related to slot configuration information in two consecutive slots or in consecutive periodic slots, it may be impossible to receive one while receiving the other. For example, 1) in two slots, the SFI_GC-PDCCH cannot be received in the previous slot, and the SFI_GC-PDCCH is received in the subsequent slot, or 2) conversely, in two slots, the SFI_GC-PDCCH may be received in the previous slot but not in the subsequent slot. In this case, the terminal utilizes the configuration information indicated by the successfully received SFI_GC-PDCCH for terminal operation. On the other hand, in cases 1) and 2), the terminal assumes that it has failed to receive slot configuration information from the base station. As a result, the terminal uses the slot configuration information currently available to the terminal without changing / updating the slot configuration information to perform scheduled downlink reception or uplink transmission. Or, even in cases 1) and 2), based on the slot in which the SFI_GC-PDCCH was received, similar to the case where SFI_GC-PDCCH related to the change of slot configuration information is continuously received from the base station, the terminal performs downlink reception and uplink transmission in the following three ways. - 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 performs downlink reception and uplink transmission assuming the changed slot configuration information. - In a periodically set transmission period, starting from the slot in the next period in which the GC-PDCCH is received, the base station performs downlink transmission or uplink reception using the configuration information of the changed slot, 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, the slot configuration information is transmitted from SFI_GC-PDCCH and / or SFI_US-PDCCH. Another one of the problems to be solved by the present invention relates to the operation of the terminal when, if a terminal receives SFI_GC-PDCCH and SFI_US-PDCCH, 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] Referring to FIGS. 13 and 14, the terminal knows the configuration of the slot via the slot configuration information (e.g., symbol configuration information in the slot) of SFI_GC-PDCCH (FIG. 13), and knows the configuration of the scheduled slot using the scheduling information (e.g., DL / UL scheduled OFDM symbol set) of SFI_US-PDCCH (FIG. 14). For the same slot, the configuration of the slot obtained via the two pieces of information may be the same or different.

[0143] On one hand, if the slot configuration information transmitted from SFI_GC-PDCCH and the slot configuration information transmitted from SFI_US-PDCCH do not match for a (scheduled symbol), the terminal gives priority to 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 SFI_GC-PDCCH is not detected (for example, skips / cancels the operations after SFI_GC-PDCCH detection), and performs the downlink reception operation or the uplink transmission operation according to the scheduling information and the slot configuration information in SFI_US-PDCCH. That is, regardless of whether there is a collision between SFI_GC-PDCCH and SFI_US-PDCCH, the terminal always performs PUSCH transmission or PDSCH reception as scheduled via SFI_US-PDCCH. On the other hand, this solution is applied on a symbol-by-symbol basis. For example, the terminal assumes that SFI_GC-PDCCH is not detected only for the colliding symbols.

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

[0145] As an example, if the PDSCH reception interval (OFDM symbol) notified 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 SFI_GC-PDCCH. For example, referring to FIGS. 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 when SFI_US-PDCCH notifies 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 interval (OFDM symbol) notified 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 SFI_GC-PDCCH. For example, referring to FIGS. 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 when SFI_US-PDCCH notifies that the start position of the PUSCH is the 6th OFDM symbol, and the terminal transmits the PUCCH according to the scheduling information of SFI_US-PDCCH.

[0147] As another example, if the start position, length, or end position of the OFDM symbol notified by the DL scheduling information of SFI_US-PDCCH is not included in the DL configuration based on the slot configuration information of SFI_GC-PDCCH and overlaps with an Unkown symbol, the terminal determines that the scheduling information received from SFI_US-PDCCH is different from the information received from SFI_GC-PDCCH. For example, if SFI_GC-PDCCH indicates that the downlink DL transmission consists of the 4th OFDM symbol and SFI_US-PDCCH indicates that the PDSCH also exists in the 7th OFDM symbol beyond the corresponding section, the terminal 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 notified by the UL scheduling information of SFI_US-PDCCH is not included in the UL configuration based on the slot configuration information of SFI_GC-PDCCH and overlaps with an Unkown symbol, the terminal determines that the scheduling information received from SFI_US-PDCCH is different from the information received from SFI_GC-PDCCH. For example, if SFI_GC-PDCCH indicates the slot configuration 3 in FIG. 11 and SFI_US-PDCCH notifies that the start position of the PUSCH is the 5th OFDM symbol, the terminal does not perform PUSCH transmission (e.g., skips / cancels the reception operation).

[0149] For the sake of convenience in explanation, hereinafter, "when the scheduling information received from SFI_US-PDCCH is different from the (slot configuration) information received from SFI_GC-PDCCH" is expressed as that a "(slot configuration) violation" has occurred.

[0150] Referring to FIG. 20, when the base station transmits SFI_US-PDCCH to the terminal from the n-th slot and the SFI_US-PDCCH allocates PDSCH to the (n + k)-th slot (where k is an integer greater than or equal to 1), the terminal that has been allocated PDSCH from the received SFI_US-PDCCH should determine whether there is a violation of the above-described slot configuration by determining whether reception of the PDSCH is possible. As an example of the present invention, if SFI_GC-PDCCH is transmitted in the downlink-scheduled slot, the terminal determines whether there is a violation by using the slot configuration information of SFI_US-PDCCH and the scheduling information of SFI_US-PDCCH. In FIG. 20, if SFI_US-PDCCH is transmitted from slot n and the transmission of PDSCH is scheduled in slot n + k, the terminal uses the SFI_GC-PDCCH received in slot n + k to confirm whether there is a violation.

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

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

[0153] The terminal is allocated DL-only as the configuration of a future slot (e.g., slot n+k) via GC-PDCCH or US-PDCCH containing scheduling information at the time of scheduling (e.g., slot n), and GC-PDCCH is not transmitted / received in the allocated DL-only slot (e.g., slot n+k). In this case, the GC-PDCCH received in the nearest slot before the DL-only slot (e.g., slot n+k-i) notifies the slot configuration after the DL-only slot, and the terminal utilizes the slot configuration information of the said GC-PDCCH to determine 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 a terminal that has received UL (or DL) scheduling information from a base station is as follows. If the terminal receives scheduling information for a specific slot (i.e., US-PDCCH), in order to check whether the configuration of the corresponding slot has changed, it monitors GC-PDCCH from the slot after the slot from which US-PDCCH could be received from the base station to the scheduled slot. The slots to be monitored are referred to as the monitoring interval. If the terminal cannot receive GC-PDCCH during the monitoring interval, it performs PUSCH transmission (or PDSCH reception) from the slot scheduled according to the scheduling information of US-PDCCH. If the terminal receives one or more GC-PDCCH during the monitoring interval (based on the scheduled slot), it performs or does not perform PDSCH reception and PUSCH transmission (e.g., skips / cancels related operations) according to the slot configuration notified from the most recently received GC-PDCCH and the scheduling information.

[0155] Figures 19, 22, and 23 show the operations of a terminal that has received 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 notifies 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, slots n+1, n+2, and n+3, as the monitoring interval. The terminal monitors the GC-PDCCH during the monitoring interval. At this time, in slots n+1, n+2, and n+3, GC-PDCCHs that transmit the slot configuration information of slot n+3 are received respectively. Here, the GC-PDCCHs in slots n+1, n+2, and n+3 indicate the slot configuration of slot n+3 as 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, that is, the slot configuration of n+3, is slot format D. Thereby, the terminal performs or does not perform (for example, skips / cancels related operations) the reception of the PDSCH or the transmission of the PUSCH in slot n+3 based on (i) the slot configuration according to slot format D and (ii) the scheduling information received in slot n. If no GC-PDCCH is received during the monitoring interval, the terminal performs the reception of the PDSCH or the transmission of the PUSCH in slot n+3 according to the information scheduled in slot n.

[0156] As an example of whether to perform PDSCH reception or PUSCH transmission according to the scheduling information, when the PDSCH (PUSCH) is scheduled, if the OFDM symbol to which the PDSCH (PUSCH) is allocated is still configured with DL (UL) in the most recently received GC-PDCCH within the monitoring interval, the terminal performs PDSCH reception (PUSCH transmission). As another example of whether to perform PDSCH reception or PUSCH transmission according to the scheduling information, when the PDSCH (PUSCH) is scheduled, if the slot configuration known when the PDSCH (PUSCH) is scheduled is the same as the slot configuration known via the most recently received GC-PDCCH within the monitoring interval, the terminal performs PDSCH reception (PUSCH transmission); otherwise, it does not perform PDSCH reception (PUSCH transmission). If the slot configuration information of the GC-PDCCH and the US-PDCCH is different, UL transmission may be prohibited because it may generate interference signals, and only DL reception may be allowed. Here, the PDSCH / PUSCH scheduled via the US-PDCCH has been described as an example, but the present invention is also applicable to uplink / downlink control signals such as (non)-periodically transmitted reference signals, UCI, and SRS. At this time, the same operation is configured in terms of the OFDM symbol or RB unit in which the corresponding control signal is transmitted. Here, the transmission of the aperiodic signal is scheduled via the US-PDCCH.

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

[0158] FIG. 24 illustrates the operation when slot configuration information is included in the US-PDCCH. When notifying the slot format of FIG. 11, the bit size of the slot configuration information in the US-PDCCH is 3 bits. On the other hand, the slot format / configuration is not limited to DL and UL only, and there may be configurations such as 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 via the CRC check (S2402, S2404, yes), the terminal(s) does not use the slot configuration information transmitted from the US-PDCCH (e.g., 3-bit information), and performs uplink transmission and downlink reception in the corresponding slot according to the slot configuration information of the GC-PDCCH (S2406). On the other hand, if the reception / detection of the GC-PDCCH fails via the CRC check (S2402, S2404, no), but the CRC check of the US-PDCCH is successful (S2408), the terminal knows the uplink / downlink / Unknown configuration of the symbols in the slot using the slot configuration information in the US-PDCCH (e.g., 3-bit information) (S2410, yes), and performs uplink transmission and downlink reception in the corresponding slot based on this (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). On the other hand, different from the illustration in the drawing, the terminal does not receive the GC-PDCCH (slot configuration information) and knows the slot configuration only by receiving the US-PDCCH. That is, if the reception / detection of the US-PDCCH (slot configuration information) is successful, the terminal may not receive the GC-PDCCH (slot configuration information). Here, not receiving the GC-PDCCH (slot configuration information) means skipping the decoding of the GC-PDCCH, or (for the symbol set scheduled by the US-PDCCH (slot configuration information)) skipping / canceling the operation according to the slot configuration information even if the detection of the GC-PDCCH is successful.Also, if the GC-PDCCH (slot configuration information) has configuration information regarding a plurality of slots, the fact of not receiving the GC-PDCCH is extremely applied only to the slots scheduled by the US-PDCCH.

[0159] On the other hand, the slot configuration information in the US-PDCCH through which the uplink or downlink scheduling information is transmitted is determined according to the number of cases of the slot configuration 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 the eight slot configurations, and the slot configuration information in the US-PDCCH transmits the same information. On the other hand, through the slot configuration information in the US-PDCCH, the number of cases 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 the eight slot configurations, and the slot configuration information in the US-PDCCH indicates one of the four slot configurations (for example, specific four slot configurations among the eight slot configurations 0 to 7) with 2 bits.

[0160] As another example, in the US-PDCCH through which the downlink scheduling information is transmitted, the slot configuration information informs the position where the downlink OFDM symbol ends in the slot. For example, if the base station uses the slot configuration 5, it is informed that the downlink is transmitted up to the second OFDM symbol. The terminal scheduled in the downlink knows the end point of the downlink OFDM symbol from the slot configuration information (for example, 3 bits), and uses the information to successfully receive the downlink. Also, the 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] Also, 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 a slot. For example, if slot configuration 5 is used, it indicates that the uplink transmission starts from the 4th OFDM symbol. The terminal scheduled in the uplink knows the start time of the uplink OFDM symbol from the slot configuration information and uses the information to successfully perform uplink transmission. Similarly, the 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 in 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, it indicates that the slot configuration used by the base station is the same as the semi-static SFI. If the slot configuration information is 1, it indicates that the slot configuration used by the base station is different from the semi-static SFI. The terminal determines whether to perform operations according to the scheduling information in the US-PDCCH according to the slot configuration information. If the slot configuration information is 0, since the slot configuration used by the base station is the same as the semi-static SFI, the terminal performs the scheduled uplink transmission or downlink reception based on the semi-static SFI. If the slot configuration information is 1, since the slot configuration used by the base station is different from the semi-static SFI, the terminal does not perform the scheduled uplink transmission or downlink reception.

[0163] If the base station and the terminal know the semi-static SFI, the slot configuration information described above is determined according to the semi-static SFI. As an example, if the semi-static SFI indicates slot configuration information i and the slot configuration information for notifying four different slot configurations by US-PDCCH is 2-bit information, 00 indicates slot configuration information i, 01 indicates slot configuration information i + j1, 10 indicates slot configuration information i + j2, and 11 indicates slot configuration information i + j3. Here, i1, i2, and i3 are used to notify different slot configuration information, but are determined in advance according to the semi-static SFI and the configuration information. That is, four different slot format information is notified, and one of them is set (bit 00) to be the same as the semi-static SFI. The terminal uses the semi-static SFI to perform uplink transmission or downlink reception scheduled by US-PDCCH. As another example, different from notifying the slot configuration information, a method of specifying an increase and a decrease in the number of DL and UL symbols is considered. That is, this operation is for 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 of +1 increase / +2 increase / −1 decrease / unchanged for a. The base station transmits the selected option to the terminal in 2-bit information, thereby flexibly changing the number of DL / UL instead of changing the predefined 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 operation of the terminal notified by the US-PDCCH and the semi-static SFI. For example, the US-PDCCH can notify the terminal whether it can perform downlink reception or uplink transmission based on the scheduling information 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 downlink reception operations or uplink transmission operations 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 operations related to downlink reception and uplink transmission regardless of the scheduling information of the US-PDCCH.

[0165] Referring to FIG. 11, the slot configuration composed of semi-static SFI is 4. If the base station uses slot configuration 5, the terminals scheduled for uplink transmission use the 5th, 6th, and 7th OFDM symbols for uplink transmission. In this case, the base station allocates the 4th OFDM symbol for the uplink, but the terminal uses it in the DL-UL switching gap. Therefore, in this case, the base station sets the 1-bit slot configuration information in the US-PDCCH to 0 so that the terminal performs uplink transmission in the corresponding slot, and the base station receives the corresponding uplink from the terminal. However, if the slot composed of semi-static SFI is 4 and the base station uses slot configuration 3, the terminals scheduled for uplink transmission may not be able to transmit in the slot configuration composed of semi-static SFI. Therefore, in this case, the base station sets the 1-bit slot configuration information in the US-PDCCH to 1 to prevent the terminal from performing uplink transmission in the corresponding slot. Referring to FIG. 11, the slot configuration composed of semi-static SFI is 4. If the base station uses slot configuration 3, the terminals scheduled for uplink transmission use the 2nd and 3rd OFDM symbols to receive the downlink. In this case, the base station allocates the 4th OFDM symbol for the downlink, but the terminal ignores it and receives. Therefore, in this case, the base station sets the 1-bit slot configuration information in the US-PDCCH to 0 so that the terminal performs downlink reception in the corresponding slot, and the base station receives the corresponding downlink from the terminal. However, if the slot composed of semi-static SFI is 4 and the base station uses slot configuration 5, the terminals scheduled for downlink transmission may not be able to receive the downlink. In this case, the base station sets the 1-bit slot configuration information in the US-PDCCH to 1 to prevent the terminal from performing downlink reception in the corresponding slot.

[0166] If the base station knows that the terminal knows the semi-static SFI, the slot configuration information in the US-PDCCH is determined according to whether the US-PDCCH is related to uplink transmission or downlink transmission and the semi-static SFI. For example, for a downlink-scheduled terminal, when following the semi-static SFI, only the slot configuration for monitoring the downlink transmission when monitoring prohibited intervals (e.g., UL) is notified, and for an uplink-scheduled terminal, only the slot configuration for transmitting in prohibited intervals (e.g., DL) when following the semi-static SFI is notified. For example, referring to FIG. 11, if slot configuration 4 is used as the slot configuration composed of the semi-static SFI, only the information for slot configurations 5, 6, and 7 is transmitted as slot configuration information to the uplink-scheduled terminal, and only the slot configuration information for slot configurations 0, 1, and 2 is transmitted to the downlink-scheduled terminal. In this method, the size of the necessary slot configuration information may vary according to the slot configuration composed of the semi-static SFI. Also, the size of the necessary slot configuration information may vary according to the uplink and downlink.

[0167] To notify the terminal of the slot configuration, the US-PDCCH is scrambled and sent with different RNTIs. One or more RNTIs are assigned to notify one terminal of the slot configuration, or a number of RNTIs are generated using one assigned RNTI. For example, several RNTIs may be generated using an interleaver pattern determined from one RNTI. Also, several RNTIs may be generated using a scrambling pattern determined from one RNTI. At the terminal, the pattern for generating the RNTI is pre-agreed between the base station and the terminal. By detecting the US-PDCCH scrambled with a certain RNTI among 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 FIGS. 5 and 11, the base station selects one of the 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 composed of semi-static SFI. If the base station and the terminal know the slot configuration composed of semi-static SFI, referring to FIGS. 5 and 11, the RNTI is determined according to the relative difference between the current slot configuration of the base station and the slot configuration composed of semi-static SFI. For example, if the slot configuration composed of semi-static SFI can use four RNTIs in slot configuration i, the first RNTI indicates slot configuration i which is the slot configuration composed of semi-static SFI, the second RNTI indicates slot configuration i + j1, the third RNTI indicates slot configuration i + j2, and the fourth RNTI indicates slot configuration i + j3. Here, j1, j2, and j3 are determined in advance to indicate different slot configurations. That is, four different slot format information is indicated, and one of them 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 composed of semi-static SFI, in this method, the RNTI is determined according to the operation of the terminal indicated by the US-PDCCH and the slot configuration composed of 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 composed of semi-static SFI, and if the second RNTI is used, the operation scheduled by the US-PDCCH is not performed. As another example, different from indicating the slot configuration information, an increase and a decrease in the number of DL and UL symbols are specified.That is, it is for an operation to change the slot format compared to 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: an increase of 1 / 2, a decrease of 1, or unchanged. 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 predefined slot format and configuration information.

[0169] FIG. 25 is a block diagram of a receiver when notifying a slot configuration using RNTI. The receiver includes a step (S2502) of estimating and compensating a channel using a DM-RS pattern, a (QPSK) demodulation step (S2504), a channel decoding step (S2506), a step (S2508) of checking CRC with as many RNTIs as possible, and a process (S2510) of determining the success of PDCCH decoding according to the CRC check. The receiver checks CRC using all RNTIs available for notifying the slot configuration. At this time, only one CRC is valid. If all the remaining CRCs are not valid, the slot configuration information and the corresponding operation are known from the RNTI that provided the valid CRC. Here, RNTI means a terminal-specific RNTI defined for indicating slot configuration information.

[0170] FIG. 26 shows a situation that may occur when the slot configuration used by the base station is different from that used by the terminal. In FIG. 26, the actual slot format is the slot configuration actually used by the base station during implementation, and the UE decision is the slot configuration recognized by the terminal. As described above, the base station transmits GC-PDCCH (Dynamic SFI) to notify 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, since the terminal does not know whether the base station transmitted the GC-PDCCH to notify the slot configuration, the terminal operates in 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 (refer to FIG. 11), all the slots of the downlink-scheduled terminal are determined to be downlink OFDM symbols and the signal is received. Therefore, since the terminal receives signals even for the two OFDM symbols not assigned to the downlink, the probability of failure in decoding the downlink signal increases, wasting the terminal energy. Also, if the LLR (Log Likelihood Ratio) values corresponding to the two OFDM symbols not assigned to the downlink are stored in the soft buffer, there is a risk of performance degradation during retransmission. In addition to the above problems, there is a risk of resource consumption for downlink retransmission. Referring to FIG. 26(b), when the base station uses slot configuration 4 and the terminal uses slot configuration 5 (refer to FIG. 11), the uplink-scheduled terminal starts uplink transmission from the fourth OFDM symbol. However, according to the slot configuration of the base station, since it is uplink transmission from the fifth OFDM symbol, it is difficult for the base station to receive the uplink signal for the uplink transmission of the said incorrect terminal. Also, since an incorrect uplink signal is transmitted to the GP for preventing downlink-uplink buffering, buffering may occur in the surrounding terminals receiving the downlink, and there is a risk of degradation in the downlink reception performance of the surrounding terminals.

[0172] As an example to solve the above problems, if the terminal fails to successfully receive the slot configuration information transmitted from the GC-PDCCH (that is, the GC-PDCCH is not detected), the terminal either does not perform transmission on the scheduled uplink symbol, does not receive the scheduled downlink symbol, or does not perform both uplink transmission and downlink reception. If the user does not receive the downlink symbol scheduled in the downlink, the base station transmits more information via HARQ retransmission. If the user does not transmit the uplink symbol scheduled in the uplink, the base station transmits more uplink scheduling information to cause the terminal to perform uplink transmission. However, the above-described method wastes resources because it does not use the resources allocated in the scheduled slot, and requires a retransmission or rescheduling method, resulting in additional delay time.

[0173] As another example, the base station defines in advance the semi-static SFI to be used. When the terminal successfully receives the slot configuration information transmitted via the GC-PDCCH (that is, the GC-PDCCH is detected), it operates according to the indicated slot format. On the other hand, if the terminal fails to successfully receive the slot configuration information transmitted via the GC-PDCCH (that is, the GC-PDCCH is not detected), it performs uplink transmission or downlink reception according to the semi-static SFI.

[0174] Override #1 between SFI and periodic signal 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 the operation of the terminal for determining the direction of the symbol using the information on the slot configuration of SFI_GC-PDCCH. The problem addressed here includes the case where the reception of SFI_GC-PDCCH fails. Also, the problem addressed here is the case where the terminal does not receive SFI_US-PDCCH.

[0175] A periodic signal generally refers to all DL / UL signals that are set to be periodically transmitted by the upper layer (RRC). In the 3GPP NR system, the UL signals set to be periodically transmitted in the RRC layer include periodic SRS (sounding reference signal), SR (scheduling reqeust), periodic CSI, SPS-PUSCH (Semi-persistent PUSCH), etc., and the DL signals set to be periodically transmitted include CSI-RS (Channel state information reference signal), SPS-PDSCH, etc. SR and periodic CSI are transmitted via PUCCH. Specifically, the base station notifies the terminal of the slot-period / offset and transmission resources (e.g., OFDM symbols within the slot) of the periodic signal via the RRC signal.

[0176] Different from receiving scheduling information via SFI_US-PDCCH, a terminal configured to transmit or receive a periodic signal, if there is no scheduling information scheduled for itself, there is no SFI_US-PDCCH for obtaining slot configuration information for the slot in which the transmission / reception of the periodic signal is scheduled. Therefore, if scheduling information is not received via SFI_US-PDCCH, it is necessary to define the terminal operation for periodic UL transmission and periodic DL reception. Also, a method for determining the slot configuration is required to determine whether a terminal configured to perform periodic transmission / reception without scheduling information performs the transmission of a periodic signal or the reception of a periodic signal in a slot (hereinafter, a periodic slot) set to perform periodic transmission / reception.

[0177] In a state where the terminal is not receiving scheduling information via SFI_US-PDCCH, the operation of the terminal that periodically transmits / receives is as follows. First, the terminal defines a monitoring interval as the slots from after the slot in which it transmits / receives the periodic signal of the current period to the slot in which it transmits / receives the periodic signal of the next period. The terminal knows the monitoring interval via the 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 the slot configuration information for the transmission / reception slot of the next period during the monitoring interval. As an example, when configured to periodically transmit an uplink signal (e.g., periodic SRS, SR, periodic CSI, SPS-PUSCH) at a specific time-frequency resource (e.g., OFDM symbol(s)) in each (periodically configured) slot, if the terminal is instructed via the SFI_GC-PDCCH that the time-frequency resource of its periodic signal in the (periodically configured) slot is the uplink configuration, it transmits the periodic signal at the time-frequency resource in the corresponding slot. On the other hand, when configured to periodically transmit an uplink signal (e.g., periodic SRS, SR, periodic CSI, SPS-PUSCH) at a specific time-frequency resource in each (periodically configured) slot, if the terminal is instructed via the SFI_GC-PDCCH that the time-frequency resource of its periodic signal in the (periodically configured) slot is not the uplink configuration (e.g., downlink (DL) symbol or Unknown symbol), (in the corresponding slot) the periodic signal Do not transmit (e.g., skip / cancel the transmission operation). Similarly, when configured to periodically receive a downlink signal (e.g., CSI-RS, SPS-PDSCH) at specific time-frequency resources (e.g., OFDM symbols (etc.)) within each periodically configured slot, if the terminal is instructed via SFI_GC-PDCCH that the time-frequency resources of the periodic signal within the periodically configured slot are for downlink configuration, the terminal receives the periodic signal at the time-frequency resources in the corresponding slot. On the other hand, when configured to periodically receive a downlink signal (e.g., CSI-RS, SPS-PDSCH) at specific time-frequency resources within each periodically configured slot, if the terminal is instructed via SFI_GC-PDCCH that the time-frequency resources of the periodic signal within the periodically configured slot are not for downlink configuration (e.g., uplink (UL) symbol or Unknown symbol), the terminal does not receive the periodic signal in the corresponding slot (e.g., skip / cancel the reception operation). Also, if the terminal fails to receive the SFI_GC-PDCCH for the time-frequency resources of the periodic signal (e.g., OFDM symbols (etc.)) within the periodically configured slot (i.e., when the SFI_GC-PDCCH is not detected), the terminal does not transmit the periodic signal in the corresponding slot (e.g., skip / cancel the transmission operation). Here, the specific time-frequency resources include uplink / downlink transmission / reception resources in units of OFDM symbols and / or RBs. For example, the specific time-frequency resources are defined for specific OFDM symbols or a set of OFDM symbols within a slot.

[0178] As another example, the terminal performs transmission and reception of a signal originally configured to be periodically performed (i.e., a periodic signal) regardless of reception / confirmation of the GC-PDCCH during the monitoring interval. Here, for some / all of the specific signals in the periodic signal, such as signals with high importance like RS, ACK / NACK, SRS, etc., the terminal performs transmission and reception without checking the slot configuration information (e.g., SFI_GC-PDCCH). In this case, the terminal assumes that the base station appropriately schedules for the transmission and reception of the corresponding periodic signal and performs the transmission and reception operation assuming no collision occurs.

[0179] Furthermore, (among periodic signals) ACK / NACK is always transmitted by the terminal without checking the slot configuration information of GC-PDCCH. The PUCCH for transmitting ACK / NACK is allocated to one or more last OFDM symbols within a slot, and the terminal always transmits the PUCCH assuming that the symbols corresponding to the PUCCH are allocated at least for UL (regardless of the slot configuration information of GC-PDCCH). Here, the periodic ACK / NACK refers to the ACK / NACK indicating whether the reception of the SPS-PDSCH configured to be received periodically is successful or not.

[0180] FIG. 22 shows the operation of the terminal when performing periodic transmission and reception without receiving scheduling information during 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 the possibility of transmitting and receiving the periodic signal in slot n+3, monitoring intervals are defined in slot n+1, slot n+2, and slot n+3. At this time, the GC-PDCCHs of slot n+1, slot n+2, and slot n+3 notify the slot configuration of slot n+3 in slot format B, slot format C, and slot format D, respectively. At this time, the terminal determines the slot configuration (i.e., slot configuration D) indicated by the SFI_GC-PDCCH transmitted from the slot (i.e., slot n+2) closest to the periodic slot n+3 as the slot configuration of slot n+3, and based on the slot configuration D, determines whether to perform transmission and reception of the periodic signal in slot n+3.

[0181] Override #2 between SFI and periodic signal One of the problems to be solved by the present invention is a method for determining whether a periodic signal configured by RRC can be transmitted / received on a terminal, which relates to the operation of a terminal that determines the direction of a symbol by using information on the slot configuration of SFI_US-PDCCH. Here, a terminal configured to transmit or receive a periodic signal / channel from a base station 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) in a slot (hereinafter, a periodic slot) for transmitting or receiving a periodic signal and a channel. A method for the terminal to determine the configuration of the corresponding slot will be described. The problem addressed here is the case where the terminal is configured not to monitor GC-PDCCH (dynamic SFI), or the case where the terminal is configured to monitor GC-PDCCH (dynamic SFI) but fails to receive it (e.g., fails to detect GC-PDCCH (dynamic SFI)).

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

[0183] If a base station transmits a US-PDCCH that instructs scheduling for the same symbol as the symbol for the terminal to transmit and receive a periodic signal / channel (within a periodically configured slot), the terminal determines the configuration of the periodic slot according to the most recently received slot configuration information among the GC-PDCCH(s) and SFI_US-PDCCH received in the monitoring interval. Since the base station manages all transmissions of periodic signals / channels and also manages the transmission of scheduling information (US-PDCCH), there is a possibility that the base station scheduler does not schedule different operations in the same slot. Therefore, among the PDSCHs scheduled by the most recently received SFI_GC-PDCCH, the terminal determines the configuration of the periodic slot according to the most recently received slot configuration information. 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 performs the reception (or transmission) of the corresponding PDSCH, or determines whether it is possible to transmit or receive a periodic signal / channel and performs the transmission and reception of the periodic signal / channel.

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

[0185] Also, as an example of determining whether transmission and reception of periodic signals / channels are possible (in periodically configured slots), if the UL / DL direction of the OFDM symbol(s) for which transmission and reception of periodic signals / channels are allocated is the same as the slot configuration received by the terminal via the slot configuration information of the GC-PDCCH received most recently within the monitoring interval or the UL / DL direction of the OFDM symbol(s) received by the terminal via US DCI (US-PDCCH), the terminal performs transmission and reception of periodic signals / channels (in the corresponding slot), and if they do not match, the terminal does not perform transmission and reception of periodic signals / channels (in the corresponding slot).

[0186] FIG. 23 shows the operation of a terminal configured to transmit and receive a periodic signal / channel when receiving 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 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, the US-PDCCH transmitted from the slot closest to slot n+3, or the slot configuration of slot n+3 is determined according to the slot configuration according to the slot configuration information of the GC-PDCCH. In FIG. 23, the GC-PDCCH (SFI) of slot n+3 tells 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 according to the slot configuration information of the GC-PDCCH (for example, slot format D).

[0187] If PDSCH or PUSCH is scheduled in a specific slot (i.e., a periodic slot) configured to transmit and receive periodic signals / channels, some / all of the specific periodic signals / channels among the periodic signals / channels transmit and receive without checking the slot configuration information for the corresponding scheduling. In this case, the terminal assumes that the base station schedules appropriately for the transmission and reception of the corresponding periodic signals / channels and there is no collision, and performs the transmission and reception operations of the specific periodic signals / channels. Here, the specific periodic signals / channels include signals / channels with high importance such as SS (Synchronization Signal: PSS, SSS) / PBCH block, RS (e.g., CSI-RS, Phase Tracking RS, Tracking RS), ACK / NACK transmission channel, SR transmission channel, RB (Beam recovery request) transmission channel, and SRS. The specific periodic signals / channels include all of SS, RS, ACK / NACK transmission channel, SR transmission channel, BR transmission channel, and SRS, or a subset of these. For example, the specific periodic signals / channels may include the ACK / NACK transmission channel. In this case, the ACK / NACK transmission channel is configured such that the terminal always transmits and receives without checking the slot configuration information. The PUCCH for transmitting ACK / NACK is allocated to one or more last OFDM symbols in the slot. For example, PUCCH (ACK / NACK) is allocated to the last OFDM symbol, the last two OFDM symbols, or the last 4 - 14 OFDM symbols of the slot. The terminal assumes that the OFDM symbols corresponding to PUCCH are at least allocated to UL and always transmits PUCCH. Here, the periodic ACK / NACK refers to the ACK / NACK indicating whether the reception of the SPS PDSCH configured to be received periodically is successful. Also, for example, the specific periodic signals / channels may include SS, PBCH, or SSB transmitted from the base station. In this case, the terminal does not check the slot configuration information and always receives the SS / PBCH block.

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

[0189] The periodic signal generally refers to all DL / UL signals set to be periodically transmitted by the upper layer (RRC). In the 3GPP NR system, the UL signals periodically transmitted in the RRC layer include periodic SRS, SR, periodic CSI, SPS-PUSCH, etc., and the DL signals periodically transmitted include CSI-RS, SPS-PDSCH, etc. SR and periodic CSI are transmitted via PUCCH. Also, as signals configured in the terminal via the RRC signal transmitted from the base station and configured to be periodically received by the terminal on the downlink, there are periodic SCI-RS, semi-persistent CSI-RS, TRS, or Phase Tracking RS, SPS-PDSCH, etc. Specifically, the base station notifies the terminal of the slot-period / offset and transmission resources (e.g., OFDM symbols in the slot) of the periodic signal via the RRC signal.

[0190] If the symbol(s) in which a signal (i.e., a 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 a 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 as follows: 1) Receive the SFI_GC-PDCCH for the symbol(s) in which the periodic signal is received, and the corresponding SFI_GC-PDCCH indicates the symbol(s) as DL symbols; 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, the terminal receives the periodic signal within the corresponding slot even if the SFI_GC-PDCCH is not received (i.e., the SFI_GC-PDCCH is not detected). Incidentally, the terminal determines whether the symbol(s) in which the signal configured to be periodically received is received is / are DL symbols via the scheduling information of the DL data (e.g., PDSCH) received via the SFI_US-PDCCH. Conversely, the conditions for the terminal not to receive the signal configured to be periodically received within a slot are as follows: 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 the symbol as an Unknown symbol or a UL symbol; 2) Fail to receive the SFI_GC-PDCCH; or 3) Fail to receive information that the symbol(s) in which the signal configured to be periodically received is received is / are DL symbols from the SFI_US-PDCCH.Considering the override situation between SFI_GC-PDCCH, SFI_US-PDCCH, and the periodic signal, 1) means that the reception of SFI_US-PDCCH has failed, 2) means that the reception of both SFI_GC-PDCCH and SFI_US-PDCCH has failed, and 3) means the case where the reception of SFI_GC-PDCCH has failed.

[0191] Configured in the terminal via the RRC signal transmitted from the base station, and periodically transmitted on the uplink, there are periodic SRS, semi-persistent SRS, periodic PUCCH for CSI reporting, SPS-PUSCH, etc. The periodic PUCCH is piggybacked on the PUSCH scheduled by the US-PDCCH. The operation for the terminal (or the user) configured to transmit a periodic signal via the RRC signal transmitted from the base station is as follows. If the symbol in which the signal configured to be periodically transmitted by the terminal within the slot is located is indicated as an UL symbol by the semi-static DL / UL allocation (semi-static SFI), the terminal transmits the signal (e.g., periodic SRS, semi-persistent SRS, CSI, SPS-PUSCH) configured to be periodically transmitted in the corresponding slot. Also, if the symbol in which the signal configured to be periodically transmitted by the terminal within the slot is located is indicated as an Unknown symbol by the semi-static DL / UL allocation (semi-static SFI), the condition for the terminal to transmit the signal configured to be periodically transmitted in the corresponding slot is that 1) the SFI_GC-PDCCH for the symbol in which the signal configured to transmit the periodic signal is transmitted is received, and the corresponding SFI_GC-PDCCH indicates that symbol as an UL symbol, or 2) regardless of the reception of the SFI_GC-PDCCH, it includes informing the symbol in which the signal configured to be periodically transmitted is transmitted as a DL symbol by the SFI_US-PDCCH. Incidentally, the symbol in which UL data (e.g., PUSCH) is scheduled or UL control signal (e.g., PUCCH) is scheduled via the SFI_US-PDCCH is determined as an UL symbol. In the case of 1), regardless of whether the SFI_US-PDCCH can be detected, the terminal transmits a periodic signal in the corresponding slot. In the case of 2), if the symbol(s) in which the signal configured to be periodically received is received is informed as an UL symbol 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 transmits a periodic signal in the corresponding slot.Conversely, the conditions for not transmitting a signal configured to be periodically transmitted by the terminal within a slot include: 1) receiving SFI_GC-PDCCH for the symbol in which the signal configured to be periodically transmitted is transmitted, and the corresponding SFI_GC-PDCCH indicates that symbol as an Unknown symbol or a DL symbol; 2) failing to receive SFI_GC-PDCCH; or 3) being unable to receive from SFI_US-PDCCH or US-PDCCH the information that the symbol in which the signal configured to be periodically transmitted is transmitted is a UL symbol. Considering the override situation among SFI_GC-PDCCH, SFI_US-PDCCH, and the periodic signal, 1) means that the reception of SFI_US-PDCCH has failed until then, 2) means that the reception of both SFI_GC-PDCCH and SFI_US-PDCCH has failed, and 3) means the case where the reception of SFI_GC-PDCCH has failed.

[0192] Embodiment 3: General operation regarding slot configuration Hereinafter, as a method for notifying slot configuration information, when there is a semi-static SFI, SFI_GC-PDCCH, SFI_US-PDCCH, or some of them, a method for the terminal to determine whether a symbol within a slot is DL / UL / Unknown will be described. In the following description, the expression that SFI is "Nothing" means that the base station has not transmitted the SFI or the terminal has been unable to receive it (for example, PDCCH missing, PDCCH detection failure). Also, the expression that SFI is "Anything" means that some slot configuration information has been transmitted via the SFI. Unless otherwise specified, SFI = "Anything" includes SFI = "Nothing".

[0193] Preferred embodiments of the present invention are shown in Table 4. Referring to Table 4, the terminal determines the format / configuration for each symbol within the slot as follows. First, for DL / UL / Unknown symbols, the terminal makes a determination in the following order of precedence. -Semi-static SFI > Dynamic SFI from US-PDCCH > Dynamic SFI from GC-PDCCH

[0194] For Unknown symbols, the terminal makes a determination 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. -DL / UL / Reserved symbols configured with semi-static SFI are not changed. -Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, are modified with the symbol configuration of SFI_GC-PDCCH or SFI_US-PDCCH. ·For Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration for each other, the terminal follows the symbol configuration of SFI_GC-PDCCH and SFI_US-PDCCH. ·For Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations for the corresponding symbol, the terminal always gives priority to 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 the slot as follows. First, the priorities of DL / UL / Reserved and Unknown are configured to be different. For DL / UL / Reserved symbols, the terminal determines according to the following priorities. -Semi-static SFI > Dynamic SFI from GC-PDCCH = Dynamic SFI from US-PDCCH

[0198] Also, for Unknown symbols, the terminal determines according to the following priorities. -Dynamic SFI from GC-PDCCH = Dynamic SFI from US-PDCCH > semi-static SFI

[0199] Here, "=" indicates the same priority. Among the SFIs indicated by "=", the priorities are determined to be different according to the time when the terminal receives the SFI. For example, the priority of the most recently received SFI may be higher.

[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. - DL / UL / Reserved symbols configured with semi-static SFI are not changed. - Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, are modified with the symbol configuration of SFI_GC-PDCCH or SFI_US-PDCCH. · For Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration to each other, the terminal follows the symbol configuration of SFI_GC-PDCCH and SFI_US-PDCCH. · For an Unknown symbol composed of semi-static SFI or a symbol not composed of semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal determines the slot format by giving priority to the most recently received one between SFI_GC-PDCCH and SFI_US-PDCCH. If SFI_GC-PDCCH and SFI_US-PDCCH are received simultaneously, the terminal can always expect a slot format with the same symbol configuration. Thus, if SFI_GC-PDCCH and SFI_US-PDCCH are received simultaneously but indicate different symbol configurations, the terminal determines it 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 them in the following priority order. - Semi-static SFI > Dynamic SFI from GC-PDCCH > Dynamic SFI from US-PDCCH

[0203] And for Unknown symbols, the terminal determines them in 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. - DL / UL / Reserved symbols composed of semi-static SFI are not changed. Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, are modified in the symbol configuration of SFI_GC-PDCCH or SFI_US-PDCCH. · If SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration for Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, the terminal shall follow the symbol configurations of SFI_GC-PDCCH and SFI_US-PDCCH. · If SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations for Unknown symbols configured with semi-static SFI, or symbols not configured with semi-static SFI, the terminal shall always prioritize SFI_GC-PDCCH to determine the corresponding symbols.

[0205]

Table 6

[0206] Next, the case where the priorities of "Reserved" symbols and DL / UL / Unknown symbols are configured differently will be described.

[0207] Referring to Table 7, the terminal determines the format / configuration for each symbol in the slot as follows. First, for Reserved symbols, the terminal determines them according to the following priorities. -Semi-static SFI>Dynamic SFI from GC-PDCCH=Dynamic SFI from US-PDCCH

[0208] Then, for DL / UL / Unknown symbols, the terminal determines them according to the following priorities. -Dynamic SFI from GC-PDCCH=Dynamic SFI from US-PDCCH>semi-static SFI

[0209] Here, "=" indicates the same priority. Among the SFIs indicated by "=", the priority is determined to be different according to the time when the terminal receives the SFI. For example, the priority of the most recently received SFI may be higher.

[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. - The Reserved symbols composed of semi-static SFI are always Reserved symbols. - All symbols except the Reserved symbols composed of semi-static SFI are changed to the symbols of SFI_GC-PDCCH and SFI_US-PDCCH. · For all symbols except the Reserved symbols composed of semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration to each other, the terminal follows the symbol configuration of SFI_GC-PDCCH and SFI_US-PDCCH. · For all symbols except the Reserved symbols composed of semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal always gives priority to SFI_US-PDCCH to determine the corresponding symbols.

[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 symbols, the terminal makes a determination according to the following priority. - Semi-static SFI > Dynamic SFI from GC-PDCCH = Dynamic SFI from UE-specific PDCCH

[0213] For DL / UL / Unknown symbols, the terminal makes a determination based on the following priority order. - Dynamic SFI from UE-specific PDCCH > Dynamic SFI from GC-PDCCH > Semi-static SFI

[0214] For more details, referring to Table 8, the terminal determines and defines the format / configuration for the symbols within a slot according to the slot configuration information and the following symbol determination rules. - Reserved symbols configured with semi-static SFI are always Reserved symbols. - All symbols except the Reserved symbols configured with semi-static SFI are changed to the symbols of SFI_GC-PDCCH and SFI_US-PDCCH. · For all symbols except the Reserved symbols configured with semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration for each other, the terminal follows the symbol configuration of SFI_GC-PDCCH and SFI_US-PDCCH. · For all symbols except the Reserved symbols configured with semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal always gives priority to SFI_US-PDCCH to determine the corresponding symbols.

[0215]

Table 8

[0216] Referring to Table 9, the terminal determines the format / configuration for each symbol within a slot as follows. First, for Reserved symbols, the terminal makes a determination based on the following priority order. - Semi-static SFI > Dynamic SFI from GC-PDCCH = Dynamic SFI from UE-specific PDCCH

[0217] For DL / UL / Unknown symbols, the terminal makes a determination based on the following priorities. - Dynamic SFI from GC-PDCCH > Dynamic SFI from UE-specific PDCCH > Semi-static SFI

[0218] For more details, referring to Table 9, the terminal determines and defines the format / configuration for the symbols within a slot according to the slot configuration information and the following symbol determination rules. - Reserved symbols configured with semi-static SFI are always Reserved symbols. - All symbols except the Reserved symbols configured with semi-static SFI are changed to the symbols of SFI_GC-PDCCH and SFI_US-PDCCH. · For all symbols except the Reserved symbols configured with semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate the same symbol configuration to each other, the terminal follows the symbol configuration of SFI_GC-PDCCH and SFI_US-PDCCH. · For all symbols except the Reserved symbols configured with semi-static SFI, if SFI_GC-PDCCH and SFI_US-PDCCH indicate different symbol configurations, the terminal always gives priority to SFI_GC-PDCCH to determine the corresponding symbols.

[0219]

Table 9

[0220] In Tables 4 to 9, in the method of determining the format / configuration for each symbol within a slot to know the slot format, the terminal does not use the direction of statically or semi-statically configured periodic signals / channels (e.g., DL, UL, or SL (sidelink)). If there are statically or semi-statically configured periodic signals / channels in the terminal, the terminal adds the following terminal operations to Tables 4 to 9 respectively and applies them. - 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 and receives the periodic signal / channel. - Otherwise (i.e., if the symbol directions are different), the terminal does not transmit and receive the periodic signal / channel (e.g., skips the transmission and reception operation).

[0221] The terminal operation for the periodic signal in Table 4, which is a preferred embodiment of the present invention, is illustrated in FIG. 10.

[0222]

Table 10

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

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

[0225] The terminal is configured to periodically monitor or receive a CORESET for receiving US-PDCCH or GC-PDCCH. At this time, if it is determined that the symbol in which the CORESET is transmitted is DL, the terminal is set to monitor or receive the CORESET. Further, even if it is determined that the symbol in which the CORESET is transmitted is Unknown in the semi-static SFI, the terminal is set to monitor or receive the CORESET.

[0226] Next, when the terminal monitors GC-PDCCH at specific intervals, a method for determining slot configuration information will be described if the symbol to be monitored is a UL symbol or Unknown in SFI_GC-PDCCH.

[0227] As an example, when the terminal monitors GC-PDCCH at specific intervals, if the symbol corresponding to the CORESET to be monitored is a UL symbol (for example, when notified as UL in the semi-static SFI, when notified as UL in the previously transmitted SFI_GC-PDCCH, or when notified as UL in the previously transmitted SFI_US-PDCCH), the terminal operates without expecting to receive SFI_GC-PDCCH. That is, the terminal determines the slot configuration by revising SFI_GC-PDCCH to "Nothing" in the terminal operation according to Tables 4 to 9.

[0228] As another example, when the terminal monitors GC-PDCCH at specific intervals, if the symbol corresponding to the monitored CORESET is a UL symbol (for example, when notified as UL by semi-static SFI, or when notified as UL by previously transmitted SFI_GC-PDCCH, or when notified as UL by previously transmitted SFI_US-PDCCH), the terminal assumes that the GC-PDCCH is transmitted in an adjacent slot and monitors the GC-PDCCH in the adjacent slot to receive SFI_GC-PDCCH. Preferably, the adjacent slot is the nearest common search space in the future among the configured common search spaces. 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 SFI_GC-PDCCH every 4 slots. At this time, if the CORESET for monitoring SFI_GC-PDCCH in slot n+5 is a UL symbol, the terminal monitors 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 SFI_GC-PDCCH every 4 slots. At this time, if the CORESET for monitoring SFI_GC-PDCCH in slot n+4 is a UL symbol, the terminal monitors SFI_GC-PDCCH in slot n+4-k (for example, 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 SFI_GC-PDCCH of a different length. More specifically, the terminal assumes that the number of slots to which the slot configuration information of SFI_GC-PDCCH applies is the same as the monitoring period. Referring to FIG. 27, if the terminal is configured to monitor SFI_GC-PDCCH every 4 slots, SFI_GC-PDCCH has slot configuration information for 4 slots. If the monitored slot is changed and the terminal receives SFI_GC-PDCCH in the changed slot, the terminal monitors 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 in 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 3 slots, i.e., slot n+5, slot n+6, and slot n+7, is transmitted via GC-PDCCH in slot n+5. Referring to FIG. 27(b), since the monitored slot is changed from slot n+4 to slot n+3, the terminal assumes that the slot configuration information for 4 slots, i.e., slot n+4, slot n+5, slot n+6, and slot n+7, is transmitted via GC-PDCCH in slot n+3. Here, since the slot information for slot n+3 is expected to be received via SFI_GC-PDCCH from slot n, the SFI_US-PDCCH transmitted to slot n+3 does not include the slot information for slot n+3.

[0230] The terminal is configured to periodically monitor the SFI_US-PDCCH. The terminal always expects that the SFI_GC-PDCCH is transmitted via the GC-PDCCH for each monitoring period. When the terminal monitors the GC-PDCCH for 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". Therefore, 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 slots n to n+3 are "Unknown" symbols.

[0231] The terminal is configured to periodically monitor the SFI_US-PDCCH. At this time, the terminal is instructed via RRC signaling about whether it always expects the GC-PDCCH to be transmitted for each monitoring period or not. Preferably, in the RRC signaling, the information is indicated by 1 bit. If the terminal is configured to expect that the GC-PDCCH is transmitted for each monitoring period, the terminal monitors the GC PDCCH for each 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. Therefore, the terminal follows the terminal operation when the SFI_GC-PDCCH indicates "Unknown" (see FIG. 10).

[0232] On the one hand, if the terminal is configured such that the GC-PDCCH cannot always be transmitted for each monitoring period, the terminal monitors the GC PDCCH for each monitoring period. However, if the reception of the GC-PDCCH fails, all the symbols within the slot indicated by the SFI_GC-PDCCH are determined as "Nothing". Thereby, the symbols within the corresponding slot follow the semi-static allocation (semi-static SFI), the symbol direction of the periodically configured signal, or the symbol direction indicated by the SFI_US-PDCCH or US-PDCCH (e.g., DL, UL, Unknown, reserved, or guard period).

[0233] In NR, uplink transmission is supported without a UL grant. At this time, the base station notifies the terminal of the resources that can perform uplink transmission without a UL grant either through RRC or through an L1 signal (e.g., US-PDCCH). Notifying the resources through RRC is called type-1, and notifying through an L1 signal is called type-2. The terminal makes the following assumptions about the uplink transmission resources notified by type-1 transmission and type-2 transmission. The terminal always assumes that the symbols corresponding to the uplink resources notified regardless of the two types are UL symbols. That is, the UL symbols do not change according to other slot configuration information, such as the information transmitted from SFI_US-PDCCH. Therefore, it is regarded as the same as notifying the UL symbols with a semi-static UL / DL allocation (semi-static SFI). As another method, the terminal always assumes that the symbols corresponding to the uplink resources notified by type-1 are UL symbols. On the other hand, if the symbols corresponding to the uplink resources notified by type-2 are located in the resources notified as Unknown with a semi-static DL / UL allocation, the uplink resources will change to downlink or Unknown symbols according to SFI_GC-PDCCH and SFI_US-PDCCH, just like the symbols set to transmit periodic signals by RRC. That is, the terminal performs terminal operations considering the symbols notified by type-1 transmission as the UL symbols notified by semi-static SFI, and performs terminal operations considering the symbols notified by type-2 transmission as the symbols set to transmit and receive periodic signals (see Table 10).

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

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

[0236] As shown in the figure, the terminal 100 according to the 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 the base station 200, an external device, and a server using a mobile communication network, and provides a cellular communication service using 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 phone call signal, a text / multimedia message. The cellular communication interface card 121 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 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 radio signals with at least one of the base station 200, external device, and server using a mobile communication network, and provides a cellular communication service in a second frequency band based on the instructions of the processor 110. The cellular communication interface card 122 includes at least one NIC module that utilizes the LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band is a 2.4 GHz or 5 GHz band.

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

[0242] Next, the memory 130 stores the control programs used in the terminal 100 and various data thereby. Such control programs include a predetermined program necessary for the terminal 10, to perform wireless communication with at least one of the base station 200, external device, and server.

[0243] Next, the user interface 140 includes various forms 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 an output based on the instructions of the processor 110 using various output means.

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

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

[0246] First, the processor 210 executes various instructions or programs to process data inside the base station 200. Also, the processor 100 controls the overall operation including each unit of the base station 200 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 communicates according to the signaled slot configuration. [[ID=X]] [[ID=X]]

[0247] [[ID=X]] 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, 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 each network interface card may be independently arranged according to a circuit configuration or application different from the drawings. [[ID=X]] [[ID=X]]

[0248] [[ID=X]] The cellular communication interface card 221 uses a mobile communication network to transmit and receive wireless signals with at least one of the terminal 100, an external device, and a server, and provides a cellular communication service in a first frequency band based on an instruction from the processor 210. Here, the wireless signal includes various forms of data or information such as a voice call signal, a video phone call signal, and a text / multimedia message. The cellular communication interface card 221 includes at least one NIC module that uses 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 uses a mobile communication network to transmit and receive wireless signals with at least one of the terminal 100, an external device, and a server, 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 that uses 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 with at least one of the terminal 100, external device, and server using wireless LAN connection, and provides a wireless LAN service in a second frequency band based on the instructions of the processor 210. The wireless LAN interface card 223 includes at least one NIC module that utilizes 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, external device, and server according to the wireless LAN standard or protocol of the frequency band supported by the corresponding NIC module.

[0251] The terminal 100 and the base station 200 shown in FIG. 28 are block diagrams according to an embodiment of the present invention, and the separately shown blocks logically distinguish the elements of the device. Therefore, the above-described elements of the device are attached to one chip or a plurality of chips according to the design of the device. Also, some configurations of the terminal 100, for example, the user interface unit 140 and the display unit 150, etc., are selectively provided in the terminal 100. Further, the user interface 140 and the display unit 150, etc., are additionally provided in the base station 200 as necessary.

[0252] Although the method and system of the present invention have been described in relation to specific embodiments, 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, and those with ordinary knowledge in the technical field to which the present invention pertains should be able to understand that it can be easily changed to other specific forms without changing the technical idea and essential features of the present invention. Therefore, the above-described embodiments are illustrative in all aspects and should be understood as being restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

[0254] The scope of the present invention is defined by the claims set forth below rather than the above detailed description, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included within the scope of the present invention. This disclosure includes the following aspects. (Clause 1) In a user equipment (UE) used in a wireless communication system, the UE includes a communication module, and a processor, and the processor receives a radio resource control (RRC) signal including a slot format configuration regarding a slot format, the slot format configuration provides the number X of downlink symbols and the 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, monitors a group common physical downlink control channel (GC-PDCCH) including slot format information, when a set of symbols set by a higher layer for the UE to transmit an uplink signal is within the 1 or more flexible symbols set by the RRC signal, 1) whether the GC-PDCCH is detected by the UE and 2) When the GC-PDCCH is detected by the UE, whether the slot format information indicates the set of symbols as uplink A user equipment configured to selectively perform transmission of the uplink signal based on this. (Clause 2) The user equipment according to Clause 1, wherein when the GC-PDCCH is not detected by the UE, the transmission of the uplink signal is cancelled in the set of symbols. (Clause 3) The user equipment according to Clause 1 or 2, wherein when the GC-PDCCH is detected by the UE and the slot format information indicates the set of symbols as flexible, the transmission of the uplink signal is cancelled in the set of symbols. (Clause 4) The user equipment according to any one of Clauses 1 to 3, wherein when the GC-PDCCH is detected by the UE and the slot format information indicates the set of symbols as uplink, the transmission of the uplink signal is performed in the set of symbols. (Clause 5) The user equipment according to any one of Clauses 1 to 4, wherein the uplink signal includes a periodic uplink signal. (Clause 6) The user equipment according to any one of Clauses 1 to 5, wherein the uplink signal includes a sounding reference signal (SRS). (Clause 7) The user equipment according to any one of Clauses 1 to 6, wherein the upper layer includes an RRC layer. (Clause 8) The user equipment according to any one of Clauses 1 to 7, wherein the RRC signal including a slot format configuration is a cell-specific signal or a terminal-specific signal. (Clause 9) A method used by a user equipment (UE) in a wireless communication system, wherein the UE Receiving a Radio Resource Control (RRC) signal including a slot format configuration related to a slot format, wherein the slot format configuration provides a number X of downlink symbols and a number Y of uplink symbols, the slot format is configured in an order of zero or more downlink symbols, one or more flexible symbols, and zero or more uplink symbols, and the one 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; when 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) determining whether the GC-PDCCH is detected by the UE; 2) when the GC-PDCCH is detected by the UE, determining whether the slot format information indicates the set of symbols as uplink; and selectively performing transmission of the uplink signal based on 1) and 2); A method comprising the above steps. (Clause 10) The method according to Clause 9, wherein when the GC-PDCCH is not detected by the UE, the transmission of the uplink signal is cancelled with the set of symbols. (Clause 11) The method according to Clause 9 or 10, wherein when the GC-PDCCH is detected by the UE and the slot format information indicates the set of symbols as flexible, the transmission of the uplink signal is cancelled with the set of symbols. (Clause 12) When the GC-PDCCH is detected by the UE, when the slot format information indicates the set of symbols as the uplink, the transmission of the uplink signal is performed in the set of symbols, according to the method of any one of clauses 9 to 11. (Clause 13) The uplink signal includes a periodic uplink signal, according to the method of any one of clauses 9 to 12. (Clause 14) The uplink signal includes a sounding reference signal (SRS), according to the method of any one of clauses 9 to 13. (Clause 15) The upper layer includes the RRC layer, according to the method of any one of clauses 9 to 14. (Clause 16) The RRC signal including the slot format configuration is a cell-specific signal or a terminal-specific signal, according to the method of any one of clauses 9 to 15.

Industrial Applicability

[0255] The present invention is applied to a wireless system and a communication device (e.g., a terminal, a base station) therefor.

Explanation of Signs

[0256] 100 Terminal 110 Processor 120 Communication Module 121, 122 Cellular Communication Interface Card 123 Wireless LAN Interface Card 130 Memory 140 User Interface Unit 150 Display Unit 200 Base Station 210 Processor 220 Communication Module 221, 222 Cellular Communication Interface Card 223 Wireless LAN Interface Card 230 Memory

Claims

1. A user equipment (UE) configured to operate a third-generation partnership project (3GPP)-based wireless communication system, comprising: a communication module; a processor, wherein the processor: receives a radio resource control (RRC) signal including semi-static downlink / uplink (DL / UL) allocation information regarding slot configuration, the semi-static DL / UL allocation information providing the number X of downlink symbols and the number Y of uplink symbols; identifies, based on the semi-static DL / UL allocation information, that the slot configuration is configured in the order of zero or more downlink symbols, one or more flexible symbols, and zero or more uplink symbols, and the one or more flexible symbols are identified based on [the known number of symbols - X - Y]; a UE configured to perform wireless communication based on the slot configuration.

2. The processor is further configured to monitor a group common physical downlink control channel (GC-PDCCH) including slot format information (SFI), when a set of symbols set by a higher layer for the UE to receive a downlink signal is within the one or more flexible symbols, 1) whether the GC-PDCCH is detected by the UE, and 2) when the GC-PDCCH is detected by the UE, whether the SFI indicates the set of symbols as downlink, The UE according to claim 1, wherein the processor is configured to determine whether to receive the downlink signal in the set of symbols based on the above.

3. 1) when the GC-PDCCH is not detected by the UE, or 2) when the GC-PDCCH is detected by the UE and the SFI indicates the set of symbols as flexible or uplink, The UE according to claim 2, wherein the UE does not receive the downlink signal in the set of symbols.

4. The UE according to claim 2 or 3, wherein when the GC-PDCCH is detected by the UE and the SFI indicates the set of symbols as downlink, the UE receives the downlink signal in the set of symbols.

5. The processor is further configured to monitor a group common physical downlink control channel (GC-PDCCH) including slot format information (SFI), when a set of symbols configured by a higher layer for the UE to transmit uplink signals is within the one or more flexible symbols, 1) whether the GC-PDCCH is detected by the UE, and 2) when the GC-PDCCH is detected by the UE, whether the SFI indicates the set of symbols as uplink, based on which, the processor is configured to determine whether to transmit the uplink signal in the set of symbols, the UE according to claim 1.

6. 1) when the GC-PDCCH is not detected by the UE, or 2) when the GC-PDCCH is detected by the UE and the SFI indicates the set of symbols as flexible or downlink, the UE does not transmit the uplink signal in the set of symbols, the UE according to claim 5.

7. when the GC-PDCCH is detected by the UE and the SFI indicates the set of symbols as uplink, the UE transmits the uplink signal in the set of symbols, the UE according to claim 5 or 6.

8. A method performed by a user equipment (UE) configured to operate a 3rd Generation Partnership Project (3GPP)-based wireless communication system, receiving a radio resource control (RRC) signal including semi-static downlink / uplink (DL / UL) allocation information regarding slot configuration, the semi-static DL / UL allocation information providing the number X of downlink symbols and the number Y of uplink symbols, identifying, based on the semi-static DL / UL allocation information, that the slot configuration is configured in an order of zero or more downlink symbols, one or more flexible symbols, and zero or more uplink symbols, where the one or more flexible symbols are identified based on [known number of symbols - X - Y], performing wireless communication based on the slot configuration.

9. Further including the step of monitoring a group common physical downlink control channel (GC-PDCCH) including slot format information (SFI), wherein the step of performing the wireless communication, when a set of symbols set by a higher layer for the UE to receive a downlink signal is within the one or more flexible symbols, 1) determining whether the GC-PDCCH is detected by the UE, and 2) when the GC-PDCCH is detected by the UE, determining whether the SFI indicates the set of symbols as a downlink, The method according to claim 8, including the step of determining whether to receive the downlink signal in the set of symbols based on the above.

10. 1) when the GC-PDCCH is not detected by the UE, or 2) when the GC-PDCCH is detected by the UE and the SFI indicates the set of symbols as flexible or an uplink, The method according to claim 9, wherein the UE does not receive the downlink signal in the set of symbols.

11. The method according to claim 9 or 10, wherein when the GC-PDCCH is detected by the UE and the SFI indicates the set of symbols as a downlink, the UE receives the downlink signal in the set of symbols.

12. Further including the step of monitoring a group common physical downlink control channel (GC-PDCCH) including slot format information (SFI), wherein the step of performing the wireless communication, when a set of symbols set by a higher layer for the UE to transmit an uplink signal is within the one or more flexible symbols, 1) determining whether the GC-PDCCH is detected by the UE, and 2) when the GC-PDCCH is detected by the UE, determining whether the SFI indicates the set of symbols as an uplink, The method according to claim 8, including the step of determining whether to transmit the uplink signal in the set of symbols based on the above.

13. 1) when the GC-PDCCH is not detected by the UE, or 2) When the GC-PDCCH is detected by the UE and the SFI indicates the symbol set as flexible or downlink, The method according to claim 12, wherein the UE does not transmit the uplink signal in the symbol set. **Claim 14** The method according to claim 12 or 13, wherein when the GC-PDCCH is detected by the UE and the SFI indicates the symbol set as uplink, the UE transmits the uplink signal in the symbol set.

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