Method and apparatus for transmitting a signal in a wireless communication system

Abstract

The present invention relates to a wireless communication system, and particularly to a method for receiving control information for transmitting a PUSCH, the control information including FDRA information, a step of transmitting the PUSCH in a first RB set corresponding to a first hop within a UL BWP, the first RB set being determined based on the FDRA information, and a step of transmitting the PUSCH in a second RB set corresponding to a second hop within the UL BWP, and relates to a method for adaptively determining the second RB set based on whether the second hop belongs to an SBFD section in a time domain and a wireless device therefor.

Description

Technical Field

[0001] The present invention relates to a wireless communication system. Specifically, the present invention relates to a method for transmitting a signal in a wireless communication system and an apparatus using the same.

Background Art

[0002] After the commercialization of the fourth-generation (4G) communication system, in order to meet the increasing demand for wireless data traffic, efforts are being made to develop a new fifth-generation (5G) communication system. The 5G communication system is called a network communication system beyond 4G, a post-LTE system, or a new radio (NR) system. In order to achieve a high data transfer rate, the 5G communication system includes a system that operates using a millimeter wave (mmWave) band of 6 GHz or higher, and also includes a communication system that operates using a frequency band of 6 GHz or lower from the viewpoint of ensuring coverage. As a result, the implementation forms in base stations and terminals are under consideration.

[0003] Improve efficiency and enable communication providers to provide more data and voice services over a given bandwidth. Therefore, the 3GPP (registered trademark, the same hereinafter) NR system is designed to meet the needs for high-speed data and media transmission in addition to supporting a large amount of voice. The advantages of the NR system are higher throughput and lower latency in the same platform, support for frequency division duplexing (FDD) and time division duplexing (TDD), and low operating costs with an extended end-user environment and a simple architecture.

[0004] For more efficient data processing, the dynamic TDD of the NR system may use a method for varying the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used in the uplink and downlink according to the data traffic direction of the cell users. For example, when the downlink traffic of the cell is larger than the uplink traffic, the base station may allocate more downlink OFDM symbols to a slot (or, subframe). Information about the slot configuration should be transmitted to the terminal.

[0005] For the mitigation of radio wave path loss and the increase of radio wave transmission distance in the extremely high frequency band, beamforming, massive multiple-input multiple-output (MIMO), full dimension MIMO (FD-MIMO), array antenna, analog beamforming, hybrid beamforming that combines analog beamforming and digital beamforming, and large scale antenna technologies are being discussed in the 5G communication system. Also, for improving the system network, in the 5G communication system, evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device to device communication (D2D), vehicle to everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving network, cooperative communication, CoMP (coordinated multi-points), and technologies related to receive interference cancellation are being developed.In addition, in the 5G system, advanced coding modulation (ACM) methods such as FQAM (hybrid FSK and QAM modulation) and SWSC (sliding window superposition coding), and advanced access technologies such as FBMC (filter bank multi-carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) are being developed.

[0006] On the other hand, in a human-centered connection network where humans generate and consume information, the Internet is evolving into an Internet of Things (IoT) network that exchanges information among distributed components such as objects. All kinds of Internet of Everything (IoE) technologies that combine IoT technologies with big data processing technologies through connection to a cloud server are also emerging. To implement IoT, technical elements such as sensing technologies, wired / wireless communication and network infrastructure, service interface technologies, and security technologies are required. As a result, in recent years, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) have been studied for connections between objects. In an IoT environment, intelligent Internet technology (IT) services that collect and analyze data generated from connected objects to create new value in human life can be provided. Through the integration and hybridization of existing information technology (IT) with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health management, smart home appliances, and advanced medical services.

[0007] Therefore, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas. The application example of cloud RAN as the big data processing technology described above is an example of the integration of 5G technology and IoT technology. Generally, mobile communication systems are developed to provide voice services while guaranteeing user activities.

[0008] However, mobile communication systems are gradually expanding not only voice but also data services, and now they have been developed to the extent of providing high-speed data services. However, in the current mobile communication systems where services are being provided, due to the phenomenon of resource shortage and the high-speed service demands of users, more advanced mobile communication systems are needed.

Summary of the Invention

Problems to be Solved by the Invention

[0009] An object of the present invention is to provide a method for efficiently transmitting signals in a wireless communication system and an apparatus using the same. Specifically, an object of the present invention is to provide a frequency hopping method for efficiently performing transmission in a wireless communication system and an apparatus using the same.

Means for Solving the Problems

[0010] As one aspect of the present invention, a terminal in a wireless communication system includes a communication module and a processor for controlling the communication module. The processor receives control information for transmitting a PUSCH (physical uplink shared channel), the control information includes FDRA (frequency domain resource assignment) information, and the PUSCH is transmitted in a first RB (resource block) set corresponding to a first hop within a UL (uplink) BWP (bandwidth part), the first RB set being determined based on the FDRA information. The PUSCH is transmitted in a second RB set corresponding to a second hop within the UL BWP, and when the second hop belongs to an SBFD (subband non - overlapping full duplex) symbol set in the time domain, the second RB set is determined based on a value satisfying the following mathematical formula 1: Mathematical formula 1: M mod N size UL +RB start,UL , where M represents a value obtained based on (RB start +RB offset ), RB start represents the start RB index of the first RB set, RB offset represents an offset having one value among 0 to N size BWP - 1, N size BWP represents the number of RBs in the UL BWP, N size UL represents the number of RBs in the UL sub - band within the SBFD symbol set, and RB start,UL represents the index of the RB having the lowest index among the RBs of the UL sub - band within the UL BWP in the SBFD symbol set.

[0011] As another aspect of the present invention, there is provided a method used by a terminal in a wireless communication system, the method comprising: receiving control information for transmitting a PUSCH (physical uplink shared channel), the control information including FDRA (frequency domain resource assignment) information; transmitting the PUSCH with a first set of RBs (resource blocks) corresponding to a first hop within a UL (uplink) BWP (bandwidth part), the first set of RBs being determined based on the FDRA information; transmitting the PUSCH with a second set of RBs corresponding to a second hop within the UL BWP; and when the second hop belongs to an SBFD (subband non - overlapping full duplex) symbol set in the time domain, the second set of RBs is determined based on a value satisfying the following mathematical formula 1: Mathematical formula 1: M mod N size UL +RB start,UL , where M represents a value obtained based on (RB start +RB offset ), RB start represents the start RB index of the first set of RBs, RB offset represents an offset having one value among 0 to N size BWP - 1, N size BWP represents the number of RBs in the UL BWP, N size UL represents the number of RBs in the UL sub - band within the SBFD symbol set, and RB start,UL represents the index of the RB having the lowest index among the RBs of the UL sub - band within the UL BWP in the SBFD symbol set.

[0012] As another aspect of the present invention, a base station in a wireless communication system includes a communication module and a processor for controlling the communication module. The processor transmits control information received for a PUSCH (physical uplink shared channel), the control information includes FDRA (frequency domain resource assignment) information, and the PUSCH is received in a first set of RBs (resource blocks) corresponding to a first hop within a UL (uplink) BWP (bandwidth part). The first set of RBs is determined based on the FDRA information, and the PUSCH is received in a second set of RBs corresponding to a second hop within the UL BWP. When the second hop belongs to a set of SBFD (subband non - overlapping full duplex) symbols in the time domain, the second set of RBs is determined based on a value satisfying the following mathematical formula 1: Mathematical formula 1: M mod N size UL +RB start,UL , where M represents a value obtained based on (RB start +RB offset ), RB start represents the starting RB index of the first set of RBs, RB offset represents an offset having one value among 0 to N size BWP - 1, N size BWP represents the number of RBs in the UL BWP, N size UL represents the number of RBs in the UL sub - band within the SBFD symbol set, and RB start,UL represents the index of the RB having the lowest index among the RBs of the UL sub - band within the UL BWP in the SBFD symbol set.

[0013] As yet another aspect of the present invention, there is provided a method used by a base station in a wireless communication system, the method comprising: transmitting control information for receiving a PUSCH (physical uplink shared channel), the control information including FDRA (frequency domain resource assignment) information; receiving the PUSCH in a first set of RBs (resource blocks) corresponding to a first hop within a UL (uplink) BWP (bandwidth part), the first set of RBs being determined based on the FDRA information; receiving the PUSCH in a second set of RBs corresponding to a second hop within the UL BWP; wherein when the second hop belongs to an SBFD (subband non-overlapping full duplex) symbol set in the time domain, the second set of RBs is determined based on a value satisfying the following mathematical formula 1: Mathematical formula 1: M mod N size UL +RB start,UL , where M represents a value obtained based on (RB start +RB ) offset , RB start represents the start RB index of the first set of RBs, RB offset represents an offset having one value among 0 to N size BWP - 1, N size BWP represents the number of RBs in the UL BWP, N size UL represents the number of RBs in the UL subband within the SBFD symbol set, and RB start,UL represents the index of the RB having the lowest index among the RBs in the UL subband within the UL BWP in the SBFD symbol set.

[0014] Preferably, when the second hop belongs to a non-SBFD symbol set in the time domain, the second set of RBs may be determined based on a value satisfying the following mathematical formula 2: Mathematical formula 2: (RB start +RBoffset ) modulo N size BWP

[0015] Preferably, M may include (RB start + RB offset - RB start,UL ).

[0016] Preferably, the SBFD symbol set includes a DL sub-band frequency division multiplexed (FDM) in the frequency domain and the UL sub-band, and the RB having the lowest index in the UL sub-band may be located within the UL BWP.

[0017] Preferably, the first RB set may be determined identically based on the FDRA information regardless of whether the first hop belongs to the SBFD symbol set or the non-SBFD symbol set in the time domain.

Advantages of the Invention

[0018] The present invention provides a method for efficiently transmitting signals in a wireless communication system and an apparatus using the same. Further, the present invention provides a frequency hopping method for efficiently performing transmission in a wireless communication system and an apparatus using the same.

[0019] The effects obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned will 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

[0020]

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Best Mode for Carrying Out the Invention

[0021] The terms used in this specification adopt general terms that are currently widely used as far as possible by considering the functions in the present invention. However, those terms may be changed according to the intentions of those skilled in the art, customs, and the emergence of new technologies. Furthermore, in specific cases, there are terms arbitrarily selected by the applicant. In this case, their meanings are explained in the corresponding explanatory parts of the present invention. Therefore, it is intended to clarify that the terms used in this specification should be analyzed based not only on the names of the terms but also on the substantial meanings of the terms and the content throughout this specification.

[0022] Throughout this specification and the following claims, when an element is described as being "connected to" another element, that element may be "directly connected to" the other element or may be "electrically connected to" the other element through a third element. Furthermore, unless explicitly stated to the contrary, the term "comprising" is understood to imply the inclusion of the recited elements and not to imply the exclusion of any other elements, unless otherwise specified. Moreover, limitations such as "above" or "below" based on a specific threshold may be appropriately replaced with "greater than" or "less than", respectively, in some exemplary embodiments.

[0023] The following techniques can be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier FDMA (SC-FDMA), etc. CDMA can be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by wireless technologies such as Global System for Mobile Communications (GSM (registered trademark)) / General Packet Radio Service (GPRS) / GSM (registered trademark) Enhanced Data rates for GSM Evolution (EDGE). OFDMA can be implemented by wireless technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of the evolved UMTS (EUMTS) that uses evolved UTRA (E-UTRA), and LTE-Advanced (A) is an evolved version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A and is a system for supporting services such as enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication (mMTC) which are requirements of IMT-2020. For clarity of explanation, mainly 3GPP NR is described, but the technical idea of the present invention is not limited thereto.

[0024] Unless otherwise specified in this specification, the base station may refer to a next-generation Node B (gNB) as defined in 3GPP NR. Further, unless otherwise specified, the terminal may refer to a user equipment (UE). Hereinafter, for the sake of understanding the description, each content will be separately described as an example, but each example may be used in combination with each other. In the present disclosure, the configuration of the terminal can represent the configuration by the base station. Specifically, the base station can transmit a channel or a signal to the terminal and set the operation of the terminal or the value of the parameter used in the wireless communication system.

[0025] FIG. 1 shows an example of a wireless frame structure used in a wireless communication system.

[0026] Referring to FIG. 1, the wireless frame (or radio frame) used in the 3GPP NR system may have a length of 10 ms (Δf max N f / 100)*T c ). In addition, the wireless frame includes 10 subframes (SF: subframe) of equal size. In this specification, Δf max = 480*10 3 Hz, N f = 4096, T c = 1 / (Δf ref *N f,ref ), Δf ref = 15*10 3 Hz, and N f,ref = 2048. Numbers from 0 to 9 may be respectively assigned to the 10 subframes within one wireless frame. Each subframe has a length of 1 ms and may include one or more slots according to the subcarrier spacing. More specifically, in the 3GPP NR system, the subcarrier spacing that can be used is 15*2 μis in kHz, and μ can have values of μ = 0, 1, 2, 3, 4 as the subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for the subcarrier spacing. One subframe with a length of 1 ms can contain 2 μ slots. In this case, the length of each slot is 2 -μ ms. The numbers from 0 to 2 μ -1 can be allocated to the 2 μ slots within one subframe respectively. In addition, the numbers from 0 to 10 * 2 μ -1 can be allocated to the slots within one wireless frame respectively. The time resources can be distinguished by at least one of the wireless frame number (also called the wireless frame index), subframe number (also called the subframe index), and slot number (or slot index).

[0027] FIG. 2 shows an example of the downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, FIG. 2 shows the resource grid structure of the 3GPP NR system.

[0028] Specifically, FIG. 2 shows the structure of the resource grid of the 3GPP NR system. There is one resource grid per antenna port. Referring to FIG. 2, a slot contains a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol section. Unless otherwise specified, an OFDM symbol may simply be called a symbol. One RB contains 12 consecutive subcarriers in the frequency domain. Referring to FIG. 2, the signal transmitted from each slot is N size,μ grid,x *N RB sc subcarriers of this book and N slot symbIt may be represented by a resource grid including [[x]] OFDM symbols. Here, when the signal is a DL signal, x = DL, and when the signal is a UL signal, x = UL. N size,μ grid,x represents the number of resource blocks (RBs) according to the subcarrier spacing which is a component of μ (x is DL or UL), and N slot symb represents the number of OFDM symbols in a slot. N RB sc is the number of subcarriers constituting one RB, and N RB sc = 12. The OFDM symbol may be called a cyclic shift OFDM (CP - OFDM) symbol or a discrete Fourier transform spread OFDM (DFT - s - OFDM) symbol according to the multiple access scheme.

[0029] The number of OFDM symbols included in one slot may change according to the length of the cyclic prefix (CP). For example, in the case of normal CP, one slot includes 14 OFDM symbols, while in the case of extended CP, one slot may include 12 OFDM symbols. In certain embodiments, the extended CP may be used only at a 60 kHz subcarrier spacing. In FIG. 2, for convenience of explanation, one slot is configured using 14 OFDM symbols as an example, but the embodiments of the present disclosure may be similarly applied to slots having different numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes N size,μ grid,x *N RB sc sub - carriers of this book. The types of sub - carriers may be divided into data sub - carriers for data transmission, reference signal sub - carriers for reference signal transmission, and guard bands. The carrier frequency is also called the center frequency (fc).

[0030] One RB can be defined by N RB sc (e.g., 12) consecutive subcarriers in the frequency domain. For reference, a resource composed of one OFDM symbol and one subcarrier may be called a resource element (RE) or a tone. Thus, one RB can be composed of N slot symb *N RB sc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) within one slot. k can be an index assigned from 0 to N size,μ grid,x *N RB sc -1 in the frequency domain, and l can be an index assigned from 0 to N slot symb -1 in the time domain.

[0031] For the UE to receive signals from the base station or transmit signals to the base station, the time / frequency of the UE may be synchronized with the time / frequency of the base station. This is because when the base station and the UE are synchronized, the UE can determine the time and frequency parameters necessary to demodulate the DL signal and transmit the UL signal at an appropriate time.

[0032] In time division duplex (TDD), i.e., asymmetric spectrum, each symbol of a radio frame used can be composed of at least one of a DL symbol, a UL symbol, and a flexible symbol. In frequency division duplex (FDD), i.e., symmetric spectrum, a radio frame used as a DL carrier can be composed of a DL symbol or a flexible symbol, and a radio frame used as a UL carrier can be composed of a UL symbol or a flexible symbol. In a DL symbol, DL transmission is possible but UL transmission is not. In a UL symbol, UL transmission is possible but DL transmission is not. A flexible symbol can be determined to be used as DL or UL according to a signal.

[0033] Information about the type of each symbol, i.e., information representing any one of a DL symbol, a UL symbol, and a flexible symbol, can be configured using a cell-specific or common radio resource control (RRC) signal. In addition, information about the type of each symbol can be configured additionally using a UE-specific or dedicated RRC signal. The base station notifies, by using a cell-specific RRC signal, i) the period of the cell-specific slot configuration, ii) the number of slots with only DL symbols from the beginning of the period of the cell-specific slot configuration, iii) the number of DL symbols from the first symbol of the slot immediately following the slot with only DL symbols, iv) the number of slots with only UL symbols from the end of the period of the cell-specific slot configuration, and v) the number of UL symbols from the last symbol of the slot immediately preceding the slot with only UL symbols. Here, a symbol not composed of either a UL symbol or a DL symbol is a flexible symbol.

[0034] When information about the symbol type is configured using UE-specific RRC signals, the base station may signal in the cell-specific RRC signal whether the flexible symbol is a DL symbol or a UL symbol. In this case, the UE-specific RRC signal cannot change the DL symbol or UL symbol configured using the cell-specific RRC signal to another symbol type. The UE-specific RRC signal signals the number of DL symbols among the N slot symb symbols of the corresponding slot for each slot, and the number of UL symbols among the N slot symb symbols of the corresponding slot. In this case, the DL symbols of the slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot may be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, the symbol that is not configured using either the UL symbol or the DL symbol is the flexible symbol.

[0035] FIG. 3 is a diagram for explaining a physical channel used in a 3GPP system (e.g., NR) and a general signal transmission method using the corresponding physical channel.

[0036] When the power of the UE is turned on or the UE camps on a new cell, the UE performs initial cell search (S101). Specifically, the UE may synchronize with the BS during initial cell search. For this purpose, the UE may receive the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as the cell ID. Thereafter, the UE can receive the physical broadcast channel from the base station and obtain the broadcast information in the cell.

[0037] Upon completion of initial cell search, the UE receives the physical downlink shared channel (PDSCH) according to the physical downlink control channel (PDCCH) and the information therein, and as a result, the UE can obtain system information more specific than the system information obtained through initial cell search (S102). Here, the system information obtained by the UE is cell-common system information for the correct operation of the UE at the physical layer in Radio Resource Control (RRC), and is also referred to as Remaining system information or System Information Block (SIB) 1.

[0038] If the terminal first accesses the base station or there is no radio resource for signal transmission (if the terminal is in the RRC_IDLE mode), the terminal performs the random access procedure for the base station in S103 to S106. First, the terminal transmits a preamble via the physical random access channel (PRACH) in S103 and receives a random access response (RAR) message for the preamble from the base station via the PDCCH and the corresponding PDSCH in S104. If a valid random access response is received by the terminal, the terminal transmits data including its own identifier, etc. to the base station via the physical uplink shared channel (PUSCH) indicated by the uplink grant transmitted from the base station via the PDCCH or the PDSCH in S105. Next, the terminal waits for the reception of the PDCCH as an instruction from the base station to resolve the collision. When the terminal successfully receives the PDCCH via its own identifier and receives the corresponding PDSCH in S106, the random access procedure is terminated. The terminal obtains the terminal-specific system required for the correct operation of the terminal at the physical layer in the RRC layer during the random access procedure. When the terminal obtains the terminal-specific system information from the RRC layer, the terminal enters the RRC_CONNECTED mode.

[0039] The RRC layer is used for generating and managing messages for the control between the terminal and the Radio Access Network (RAN). More specifically, in the RRC layer, the base station and the terminal can perform storage management including broadcasting of cell system information necessary for all terminals in the cell, transmission management of paging messages, mobility management and handover, measurement reporting of the terminal and control thereof, terminal capability management, and device management. Generally, since the update of the signal transmitted in the RRC layer (hereinafter, the RRC signal) is longer than the transmission and reception cycle (i.e., transmission time interval, TTI) in the physical layer, the RRC signal can be held without changing in a long cycle.

[0040] After the procedure described above, the UE receives PDCCH / PDSCH (S107) and transmits a Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) as a general UL / DL signal transmission procedure (S108). Specifically, the UE may receive downlink control information (DCI) through the PDCCH. The DCI may include control information such as resource allocation information for the UE. Also, the format of the DCI may vary according to the intended use. The uplink control information (UCI) transmitted by the UE to the base station through the UL includes DL / UL ACK / NACK signals, a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), etc. Here, the CQI, PMI, and RI may be included in the Channel State Information (CSI). In the 3GPP NR system, the UE may transmit control information such as the HARQ-ACK and CSI described above through the PUSCH and / or PUCCH.

[0041] Figures 4a and 4b show SS / PBCH blocks for initial cell access in the 3GPP NR system.

[0042] When the power is turned on or when the UE wants to access a new cell, it may acquire time and frequency synchronization with the cell and execute an initial cell search procedure. The UE may obtain the physical cell identification information N of the cell during the cell search procedure cell IDcan be detected. For this purpose, the UE can receive synchronization signals, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station and can synchronize with the base station. In this case, the UE can obtain information such as cell identification information (ID).

[0043] Referring to FIG. 4a, the synchronization signal (SS) is described in more detail. The synchronization signal can be classified into PSS and SSS. The PSS can be used to obtain time-domain synchronization and / or frequency-domain synchronization such as OFDM symbol synchronization and slot synchronization. The SSS can be used to obtain frame synchronization and cell group ID. Referring to FIG. 4a and Table 1, the SS / PBCH block can be configured using 20 consecutive RBs (= 240 subcarriers) on the frequency axis and can be configured using 4 consecutive OFDM symbols on the time axis. In this case, among the SS / PBCH blocks, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through subcarriers 56 to 182. Here, the smallest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals through the remaining subcarriers, that is, subcarriers 0 to 55 and 183 to 239. In addition, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit signals through subcarriers 48 to 55 and 183 to 191. The base station transmits the physical broadcast channel (PBCH) through the remaining REs excluding the above signals in the SS / PBCH block.

[0044] [Table 1]

[0045] SS enables a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each group containing three unique identifiers through a combination of three PSSs and SSSs such that each physical layer cell ID is part of only one physical layer cell identifier group. Thus, the physical layer cell ID N cell ID = 3N (1) ID + N (2) ID is uniquely defined by an index N ranging from 0 to 335, which indicates the physical layer cell identifier group, (1) ID and an index N ranging from 0 to 2, which indicates the physical layer identifier within the physical layer cell identifier group. The UE can detect the PSS and identify one of the three unique physical layer identifiers. In addition, the UE can detect the SSS and identify one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d (2) ID (n) of the PSS is as follows. PSS (n) is as follows.

Number

Number

Number

[0046] Furthermore, the sequence d SSS (n) of the SSS is as follows.

Number

Number

Number

[0047] A radio frame with a length of 10 ms can be divided into two half - frames with a length of 5 ms. With reference to FIG. 4b, an explanation of the slot in which the SS / PBCH block is transmitted in each half - frame is given. The slot in which the SS / PBCH block is transmitted may be any one of cases A, B, C, D, and E. In case A, the sub - carrier spacing is 15 kHz, and the start point of the SS / PBCH block is the ({2,8}+14*n) - th symbol. In this case, at a carrier frequency of 3 GHz or less, n = 0 or 1. In addition, at a carrier frequency above 3 GHz and below 6 GHz, n = 0, 1, 2, 3 may be possible. In case B, the sub - carrier spacing is 30 kHz, and the start point of the SS / PBCH block is {4,8,16,20}+28*n. In this case, at a carrier frequency of 3 GHz or less, n = 0. In addition, at a carrier frequency above 3 GHz and below 6 GHz, n = 0, 1 may be possible. In case C, the sub - carrier spacing is 30 kHz, and the start point of the SS / PBCH block is the ({2,8}+14*n) - th symbol. In this case, at a carrier frequency of 3 GHz or less, n = 0 or 1. In addition, at a carrier frequency above 3 GHz and below 6 GHz, n = 0, 1, 2, 3 may be possible. In case D, the sub - carrier spacing is 120 kHz, and the start point of the SS / PBCH block is the ({4,8,16,20}+28*n) - th symbol. In this case, at a carrier frequency of 6 GHz or more, 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 start point of the SS / PBCH block is the ({8,12,16,20,32,36,40,44}+56*n) - th symbol. In this case, at a carrier frequency of 6 GHz or more, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0048] Figures 5a and 5b illustrate procedures for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5a, the base station may add a cyclic redundancy check (CRC) masked (e.g., XOR operation) using a radio network temporary identifier (RNTI) to control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more UEs may include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). In addition, the UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. Thereafter, the base station may perform rate matching according to the amount of resources used for PDCCH transmission after performing channel coding (e.g., polar coding) (S204) (S206). Thereafter, the base station may multiplex the DCI based on a control channel element (CCE)-based PDCCH structure (S208). In addition, the base station may apply additional processes such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI (S210), and then map the DCI to the resources to be transmitted. A CCE is a basic resource unit for a PDCCH, and one CCE may include a plurality (e.g., six) of resource element groups (REGs). One REG may be configured using a plurality (e.g., twelve) of resource elements (REs). The number of CCEs used for one PDCCH may be defined as an aggregation level.In the 3GPP NR system, an aggregation level of 1, 2, 4, 8, or 16 can be used. FIG. 5b is a diagram related to the CCE aggregation level and the multiplexing of PDCCH, showing the type of CCE aggregation level used for one PDCCH and the CCEs transmitted in the control area accordingly.

[0049] FIG. 6 shows a control resource set (CORESET) in which a physical downlink control channel (PDCCH) can be transmitted in the 3GPP NR system.

[0050] A CORESET is a time-frequency resource in which a PDCCH, that is, a control signal for a UE, is transmitted. In addition, a search space, which will be described later, can be mapped to one CORESET. Therefore, instead of monitoring all frequency bands for PDCCH reception, the UE may monitor the time-frequency region designated as the CORESET and decode the PDCCH mapped to the CORESET. The base station may configure one or more CORESETS for each cell for the UE. A CORESET can be configured using up to 3 consecutive symbols on the time axis. In addition, a CORESET can be configured in units of 6 consecutive PRBs on the frequency axis. In the embodiment of FIG. 6, CORESET #1 is configured using consecutive PRBs, and CORESET #2 and CORESET #3 are configured using non-consecutive PRBs. A CORESET can be placed in any symbol within a slot. For example, in the embodiment of FIG. 6, CORESET #1 starts at the first symbol of the slot, CORESET #2 starts at the 5th symbol of the slot, and CORESET #9 starts at the 9th symbol of the slot.

[0051] FIG. 7 shows a method for setting a PUCCH search space in the 3GPP NR system.

[0052] To transmit PDCCH to a UE, each core set may have at least one search space. In embodiments of the present disclosure, a search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) through which a UE's PDCCH can be transmitted. The search space may include a common search space that 3GPP NR UEs are required to commonly search, and a UE-specific or per-UE search space that a specific UE is required to search. Among the common search spaces, a UE may monitor a PDCCH that is configured such that all UEs in cells belonging to the same base station commonly search. In addition, a UE-specific search space may be configured for each UE such that the UE monitors PDCCHs allocated to each UE at different search space positions according to the UE. In the case of a UE-specific search space, search spaces among UEs may be partially overlapped and allocated due to a limited control area in which PDCCHs are allocated. Monitoring PDCCH includes seeking PDCCH candidates in a search space and blindly decoding them. When the blind decoding is successful, it may be expressed that the PDCCH has been (successfully) detected / received, and when the blind decoding fails, it may be expressed that the PDCCH has not been detected / received or has not been successfully detected / received.

[0053] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI known in advance to one or more UEs to transmit DL control information to the one or more UEs is called a group common (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled with a per-UE RNTI known to a specific UE to transmit UL scheduling information or DL scheduling information to the specific UE is called a UE-specific PDCCH. The common PDCCH may be included in the common search space, and the UE-specific PDCCH may be included in the common search space or the UE-specific PDCCH.

[0054] The base station can signal each UE or UE group through the PDCCH about information related to resource allocation of the paging channel (PCH) and downlink shared channel (DL-SCH) which are transmission channels (i.e., DL grant), or information related to resource allocation of the uplink shared channel (UL-SCH) and hybrid automatic repeat request (HARQ) (i.e., UL grant). The base station may transmit the PCH transport block and DL-SCH transport block through the PDSCH. The base station may transmit data except for specific control information or specific service data through the PDSCH. In addition, the UE may receive data except for specific control information or specific service data through the PDSCH.

[0055] The base station may include in the PDCCH and transmit the PDCCH information about where the UE (one or more UEs) PDSCH data is to be transmitted and how the PDSCH data will be received and decoded by the corresponding UE. For example, assume that the DCI transmitted on a specific PDCCH is CRC masked with an RNTI of "A", the DCI indicates that the PDSCH is allocated to a radio resource (e.g., frequency location) of "B", and indicates transmission format information (e.g., transport block size, modulation method, coding information, etc.) of "C". The UE monitors the PDCCH using the RNTI information the UE has. In this case, if there is a UE that performs blind decoding of the PDCCH using the RNTI of "A", that UE receives the PDCCH and, through the received PDCCH information, receives the PDSCH indicated by "B" and "C".

[0056] Table 2 shows an embodiment of the physical uplink control channel (PUCCH) used in a wireless communication system.

[0057]

Table 2

[0058] PUCCH can be used to transmit the following UL control information (UCI). - Scheduling Request (SR): Information used to request UL UL-SCH resources. - HARQ-ACK: Response to PDCCH (indicating DL SPS release) and / or response to DL transport block (TB) on PDSCH. HARQ-ACK indicates whether the information transmitted on PDCCH or PDSCH has been received. HARQ-ACK responses include positive ACK (simply ACK), negative ACK (hereinafter, NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used in combination with HARQ-ACK / NACK and ACK / NACK. Generally, ACK may be represented by bit value 1, and NACK may be represented by bit value 0. - Channel State Information (CSI): Feedback information on the DL channel. The UE generates it based on the CSI reference signal (RS) transmitted by the base station. The multiple-input multiple-output (MIMO) related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). CSI can be divided into CSI part 1 and CSI part 2 according to the information indicated by CSI.

[0059] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, various channel environments, and frame structures.

[0060] PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on the time axis and one RB on the frequency axis. When PUCCH format 0 is transmitted within two OFDM symbols, the same sequence on the two symbols may be transmitted through different RBs. At this time, the sequence may be a sequence obtained by cyclic shifting from the base sequence used for PUCCH format 0. Through this, the UE can obtain frequency diversity gain. Specifically, the terminal is M bit bits UCI (M bit = 1 or 2) can determine the cyclic shift (CS) value m cs . Also, a basic sequence of length 12 can be cyclically shifted based on the determined CS value m cs , and the cyclically shifted sequence can be mapped to 12 REs of one OFDM symbol and one RB and transmitted. The number of cyclic shifts available for the terminal is 12. When M bit = 1, 1-bit UCI 0 and 1 can be mapped to two cyclically shifted sequences with a cyclic shift value difference of 6, respectively. Also, when M bit = 2, 2-bit UCI 00, 01, 11, 10 can be mapped to four cyclically shifted sequences with a cyclic shift value difference of 3, respectively.

[0061] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted through OFDM symbols continuous on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. More specifically, UCI with M bit = 1 is modulated by BPSK. The terminal is M bitThe UCI with value 2 is modulated by QPSK (quadrature phase shift keying). A sequence of length 12 is multiplied by the modulated complex valued symbol d(0) to obtain a signal. The terminal spreads the obtained signal with a time-domain OCC (orthogonal cover code) on the even-numbered OFDM symbol to which PUCCH format 1 is assigned and transmits it. The maximum number of different terminals multiplexed in the same RB can be determined according to the length of the OCC used for PUCCH format 1. On the odd-numbered OFDM symbol of PUCCH format 1, the DMRS (demodulation reference signal) is spread with the OCC and mapped.

[0062] PUCCH format 2 can deliver UCI exceeding 2 bits. PUCCH format 2 can be transmitted through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted within two OFDM symbols, the sequences transmitted in different RBs through the two OFDM symbols may be the same for each other. Here, the sequence may be a plurality of modulated complex number values symbols d(0),..., d(M symbol -1). Here, M symbol may be M bit / 2. Through this, the UE can obtain a frequency diversity gain. More specifically, the UCI of M bit bits (M bit >2) is bit-level scrambled, QPSK modulated, and mapped to the RBs of one or two OFDM symbols. Here, the number of RBs may be one of 1 to 16.

[0063] PUCCH format 3 or PUCCH format 4 can deliver UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 can be transmitted through consecutive OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be one of 4 to 14. Specifically, the UE modulates M bit bits of UCI (M bit > 2) using π / 2-2 phase shift keying (BPSK) or QPSK to generate complex-valued symbols d(0) to d(M symb - 1). Here, when using π / 2-BPSK, M symb = M bit and when using QPSK, M symb = M bit / 2. The UE does not have to apply block-level spreading to PUCCH format 3. However, the UE may apply block-level spreading to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length 12 such that PUCCH format 4 can have a multiplexing capacity of 2 or 4. The UE performs transmit precoding (or DFT precoding) on the spread signal, maps it to each RE, and transmits the spread signal.

[0064] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 can be determined according to the length of the UCI transmitted by the UE and the maximum code rate. When the UE uses PUCCH format 2, the UE may transmit HARQ-ACK information and CSI information together through PUCCH. When the number of RBs that the UE can transmit is more than the maximum number of RBs that PUCCH format 2, or PUCCH format 3, or PUCCH format 4 can use, the UE may transmit only the remaining UCI information without transmitting some UCI information according to the priority of the UCI information.

[0065] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured through an RRC signal for indicating frequency hopping within a slot. When frequency hopping is configured, the index of the RBs to be frequency-hopped can be configured using the RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted through N OFDM symbols on the time axis, the first hop may have floor(N / 2) OFDM symbols, and the second hop may have ceil(N / 2) OFDM symbols.

[0066] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured to be repeatedly transmitted in a plurality of slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted can be configured by the RRC signal. The repeatedly transmitted PUCCH must start at a fixed-position OFDM symbol in each slot and must have a constant length. When one of the OFDM symbols of the OFDM symbols in the slot in which the UE is to transmit the PUCCH is indicated as a DL symbol by the RRC signal, the UE does not have to transmit the PUCCH in the corresponding slot and may delay the transmission of the PUCCH until the next slot for transmitting the PUCCH.

[0067] On one hand, in a 3GPP NR system, a terminal can perform transmission and reception using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). For this purpose, a BWP (bandwidth part) composed of some consecutive bandwidths may be configured within the bandwidth of the carrier. A terminal operating by TDD or operating in an unpaired spectrum may have up to 4 DL / UL BWP pairs configured for one carrier (or cell). Also, a terminal can activate one DL / UL BWP pair. A terminal operating by FDD or operating in a paired spectrum may have up to 4 DL BWPs configured for a downlink carrier (or cell), and up to 4 UL BWPs configured for an uplink carrier (or cell). A terminal can activate one DL BWP and one UL BWP for each carrier (or cell). A terminal does not need to receive or transmit in time-frequency resources other than the activated BWP. The activated BWP can be called an active BWP.

[0068] The base station can indicate to the terminal the activated BWP among the configured BWPs by using downlink control information (DCI). The BWP indicated by the DCI is activated, and the other configured BWPs are deactivated. In a carrier (or cell) operating in TDD, the base station can include a BPI (bandwidth part indicator) indicating the BWP to be activated in the DCI that schedules the PDSCH or PUSCH in order to change the DL / UL BWP pair of the terminal. The terminal can receive the DCI that schedules the PDSCH or PUSCH and identify the DL / UL BWP pair to be activated based on the BPI. In a downlink carrier (or cell) operating in FDD, the base station can include a BPI indicating the BWP to be activated in the DCI that schedules the PDSCH in order to change the DL BWP of the terminal. In the case of an uplink carrier (or cell) operating in FDD, the base station can include a BPI indicating the BWP to be activated in the DCI that schedules the PUSCH in order to change the UL BWP of the terminal.

[0069] FIG. 8 is a conceptual diagram for explaining carrier aggregation.

[0070] Therefore, it is a method in which a UE uses a plurality of frequency blocks or cells (in a logical sense) configured using UL resources (or component carriers) and / or DL resources (or component carriers) as one large logical frequency band. One component carrier may also be referred to by terms such as a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, hereinafter, for convenience of explanation, the term "component carrier" is used.

[0071] Referring to FIG. 8, as an example of the 3GPP NR system, the overall system bandwidth may include up to 16 component carriers, and each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically continuous subcarriers. Although FIG. 8 shows that each of the component carriers has the same bandwidth, this is only an example, and each component carrier may have a different bandwidth. Also, although each component carrier is shown as being adjacent to each other on the frequency axis, the drawing is shown in a logical concept, and each component carrier may be physically adjacent to each other or may be separated.

[0072] For each component carrier, different center frequencies may be used. Also, one common center frequency may be used for physically adjacent component carriers. In the embodiment of FIG. 8, assuming that all component carriers are physically adjacent, the center frequency A may be used for all component carriers. Further, assuming that each of the component carriers is not physically adjacent to each other, the center frequency A and the center frequency B may be used for each of the component carriers.

[0073] When the entire system bandwidth is extended by carrier aggregation, the frequency band used for communication with each UE may be defined in units of component carriers. UE A may use 100 MHz, which is the entire system bandwidth, and execute communication using all five component carriers. UE B1 to B5 can only use a bandwidth of 20 MHz and execute communication using one component carrier. UE C1 and C2 may use a bandwidth of 40 MHz and execute communication using two component carriers each. In the example of FIG. 8, the case where UE C1 uses two non-adjacent component carriers and UE C2 uses two adjacent component carriers is shown.

[0074] FIG. 9 is a diagram for explaining single-carrier communication and multi-carrier communication. Specifically, FIG. 9(a) shows a single-carrier subframe structure, and FIG. 9(b) shows a multi-carrier subframe structure.

[0075] Referring to FIG. 9(a), in the FDD mode, a general wireless communication system can perform data transmission or data reception through one corresponding DL band and one UL band. In another specific embodiment, in the TDD mode, the wireless communication system may divide a radio frame into UL time units and DL time units in the time domain, and perform data transmission or data reception through the UL / DL time units. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) can be aggregated into each of UL and DL so that a bandwidth of 60 MHz can be supported. Each CC may be adjacent to each other in the frequency domain, or may not be adjacent. FIG. 9(b) shows a case where the bandwidths of the UL CC and the DL CC are the same and symmetric, but the bandwidth of each CC can be determined independently. In addition, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CC allocated / configured to a specific UE through RRC may be referred to as the serving DL / UL CC of the specific UE.

[0076] The base station may perform communication with the UE by activating some or all of the serving CCs of the UE, or by deactivating some of the CCs. The base station can change the CCs to be activated / deactivated and can change the number of CCs to be activated / deactivated. When the base station allocates the CCs available to the UE as cell-specific or UE-specific ones, at least one of the allocated CCs can be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. One CC that is not deactivated by the UE is called the primary CC (PCC) or the primary cell (PCell), and the CCs that the base station can freely activate / deactivate are called the secondary CCs (SCCs) or the secondary cells (SCells).

[0077] On one hand, 3GPP NR uses the concept that a cell manages radio resources. A cell is defined as a combination of DL resources and UL resources, that is, a combination of DL CC and UL CC. A cell can be configured using only DL resources or a combination of DL resources and UL resources. When carrier aggregation is supported, the relationship between the carrier frequency of the DL resource (i.e., DL CC) and the carrier frequency of the UL resource (i.e., UL CC) may be indicated by system information. The carrier frequency refers to the center frequency of each cell or CC. The cell corresponding to the PCC is called the PCell, and the cell corresponding to the SCC is called the SCell. The carrier corresponding to the PCell in the DL is the DL PCC, and the carrier corresponding to the PCell in the UL is the UL PCC. Similarly, the carrier corresponding to the SCell in the DL is the DL SCC, and the carrier corresponding to the SCell in the UL is the UL SCC. According to the UE capabilities, the serving cell can be configured using one PCell and zero or more SCells. For a UE in the RRC_CONNECTED state but not configured for carrier aggregation or not supporting carrier aggregation, there is only one serving cell configured using only the PCell.

[0078] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" that refers to several geographical areas where communication services are provided by one base station or one antenna group. That is, one component carrier may also be called a scheduling cell, a scheduled cell, a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, in order to distinguish between the cell referring to several geographical areas and the cell of carrier aggregation in this disclosure, the cell of carrier aggregation is called a CC, and the cell of the geographical area is called a cell.

[0079] FIG. 10 is a diagram showing an example to which the cross-carrier scheduling technique is applied. When cross-carrier scheduling is configured, the control channel transmitted through the first CC may schedule the data channel transmitted through the first CC or the second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is configured, and the DL grant / UL grant transmitted in the PDCCH area of the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, the search area for a plurality of component carriers exists in the PDCCH area of the scheduling cell. The PCell may basically be the scheduling cell, and a specific SCell may be designated as the scheduling cell by a higher layer.

[0080] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is the DL PCC (or, PCell), and DL component carriers #1 and #2 are DL SCCs (or, SCell). In addition, it is assumed that the DL PCC is set to the PDCCH that monitors the CC. When cross-carrier scheduling is not configured by UE-specific (or UE-group-specific or cell-specific) upper layer signaling, the CIF is disabled, and each DL CC can transmit only the PDCCH for scheduling its PDSCH without using the CIF according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, when cross-carrier scheduling is configured by UE-specific (or UE-group-specific or cell-specific) upper layer signaling, the CIF is enabled, and a specific CC (for example, the DL PCC) may transmit not only the PDCCH for scheduling the PDSCH of DL CC A using the CIF but also the PDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling). On the other hand, the PDCCH is not transmitted in another DL CC. Therefore, the UE monitors the PDCCH without the CIF to receive the self-carrier scheduled PDSCH or monitors the PDCCH with the CIF to receive the cross-carrier scheduled PDSCH according to whether cross-carrier scheduling is configured for the UE.

[0081] On the other hand, FIGS. 9 and 10 show the subframe structure of the 3GPP LTE-A system, and the same or similar configuration may be applied to the 3GPP NR system. However, in the 3GPP NR system, the subframes in FIGS. 9 and 10 may be replaced by slots.

[0082] FIG. 11 is a block diagram showing the configurations of a terminal and a base station according to an embodiment of the present disclosure, respectively.

[0083] In an embodiment of the present disclosure, the terminal can be implemented as various wireless communication devices or computer devices with guaranteed portability and mobility. The terminal can also be referred to as a UE (User Equipment), STA (Station), MS (Mobile Subscriber), etc. Further, in an embodiment of the present disclosure, the base station can control and manage cells corresponding to the service area (for example, macro cells, femto cells, pico cells, etc.), and can have functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station can also be referred to as a gNB (next Generation Node B) or an AP (Access Point), etc.

[0084] As shown in the figure, a terminal 100 according to an embodiment of the present disclosure can include a processor 110, a communication module 120, a memory 130, a user interface 140, and a display unit 150.

[0085] First, the processor 110 can execute various instructions or programs and process data inside the terminal 100. Further, the processor 110 can control the overall operations including each unit of the terminal 100 and control the data transmission and reception between the units. Here, the processor 110 may be configured to perform the operations according to the embodiments described in the present disclosure. For example, the processor 110 can receive slot configuration information, determine the configuration of the slot based on this, and perform communication according to the determined slot configuration.

[0086] Next, the communication module 120 may be 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 can be provided with a plurality of network interface cards (NICs), such as cellular communication interface cards 121 and 122 and unlicensed band communication interface cards 123, in a built-in or external form. In the figure, the communication module 120 is shown as an integrated module, but each network interface card may be independently arranged according to circuit configuration or application, different from the drawing.

[0087] The cellular communication interface card 121 can transmit and receive wireless signals with at least one of the base station 200, external devices, and servers using a mobile communication network, and provide cellular communication services in the first frequency band based on the instructions of the processor 110. According to one embodiment, the cellular communication interface card 121 can include at least one NIC module that uses a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 121 can perform cellular communication with at least one of the base station 200, external devices, and servers independently according to the cellular communication standards or protocols of the frequency band less than 6 GHz supported by the NIC module.

[0088] The cellular communication interface card 122 can transmit and receive wireless signals with at least one of the base station 200, external device, and server using a mobile communication network, and can provide cellular communication services in a second frequency band based on the instructions of the processor 110. According to one embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 122 can perform cellular communication independently with at least one of the base station 200, external device, and server according to the cellular communication standard or protocol of the frequency band of 6 GHz or higher supported by the NIC module.

[0089] The unlicensed band communication interface card 123 transmits and receives wireless signals with at least one of the base station 200, external device, and server using a third frequency band which is an unlicensed band, and provides communication services in the unlicensed band based on the instructions of the processor 110. The unlicensed band communication interface card 123 can include at least one NIC module using an unlicensed band. For example, the unlicensed band can be a 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or a 5 GHz band of 52.6 GHz or higher. At least one NIC module of the unlicensed band communication interface card 123 can perform wireless communication with at least one of the base station 200, external device, and server independently or dependently according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0090] Next, the memory 130 stores the control program used in the terminal 100 and various data thereby. Such a control program may include a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, external device, and server.

[0091] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. Also, the user interface 140 can perform output based on the instructions of the processor 110 using various output means.

[0092] Next, the display unit 150 outputs various images on the display screen. The display unit 150 can output various display objects such as content executed by the processor 110 or a user interface based on the control instructions of the processor 110.

[0093] Also, the base station 200 according to an embodiment of the present disclosure can include a processor 210, a communication module 220, and a memory 230.

[0094] First, the processor 210 can execute various instructions or programs and process data inside the base station 200. Also, the processor 210 can control the overall operation including each unit of the base station 200 and control data transmission and reception between units. Here, the processor 210 may be configured to perform the operations according to the embodiments described in the present disclosure. For example, the processor 210 can signal slot configuration information and perform communication according to the signaled slot configuration.

[0095] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To that end, the communication module 220 may include a plurality of network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, in a built-in or external form. In the figure, the communication module 220 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 drawing.

[0096] The cellular communication interface card 221 can transmit and receive wireless signals with at least one of the above-described terminal 100, external device, and server using a mobile communication network, and provide cellular communication services in a first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 may include at least one NIC module that uses a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 221 can perform cellular communication with at least one of the terminal 100, external device, and server independently according to the cellular communication standard or protocol of the frequency band less than 6 GHz supported by the NIC module.

[0097] The cellular communication interface card 222 can transmit and receive wireless signals with at least one of the terminal 100, an external device, and a server using a mobile communication network, and provide a cellular communication service in a second frequency band based on the instructions of the processor 210. According to one embodiment, the cellular communication interface card 222 can include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the terminal 100, an external device, and a server according to the cellular communication standard or protocol of the frequency band of 6 GHz or higher supported by the NIC module.

[0098] The unlicensed band communication interface card 223 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server using a third frequency band that is an unlicensed band, and provides an unlicensed band communication service based on the instructions of the processor 210. The unlicensed band communication interface card 223 can include at least one NIC module using an unlicensed band. For example, the unlicensed band can be a 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or a 5 GHz band of 52.6 GHz or higher. At least one NIC module of the unlicensed band communication interface card 223 can perform wireless communication with at least one of the terminal 100, an external device, and a server independently or dependently according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0099] The terminal 100 and the base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present invention. The blocks shown separately logically distinguish the elements of the device. Therefore, the above-described elements of the device may be mounted as a single chip or as a plurality of chips depending on the device design. Also, some configurations of the terminal 100, for example, the user interface 140 and the display unit 150, etc., may be selectively provided in the terminal 100. Also, the user interface 140, the display unit 150, etc. may be further provided in the base station 200 if necessary.

[0100] The terminal may have a slot format set from the base station in a TDD or unpaired spectrum system. The slot format can mean the type of symbol in the slot. The symbol type may be at least one of a downlink symbol (DL symbol), an uplink symbol (UL symbol), or a flexible symbol. The terminal may have the symbol type for the slots in the radio frame set from the base station. A flexible symbol can mean a symbol that is not composed of a downlink symbol or an uplink symbol.

[0101] The terminal can receive information regarding each symbol type in the slot from the base station using a cell specific or cell common radio resource control (RRC) signal. Alternatively, the terminal can receive information regarding each symbol type in the slot semi-statically in SIB1. Also, the terminal can receive information regarding each symbol type in the slot semi-statically from the base station using a UE-specific, UE-dedicated RRC signal. The base station can configure / set each symbol type in the slot for the terminal using the information regarding each symbol type in the slot.

[0102] When the terminal receives information regarding each symbol type within a slot from the base station by means of a cell-specific RRC signal, the information regarding each symbol type may include at least any one of the period of the cell-specific slot, the number of slots composed only of downlink symbols starting from the cell-specific slot at the start of the period, the number of downlink symbols from the first symbol of the slot immediately following the last slot composed only of downlink symbols, the number of slots composed only of uplink symbols from the last cell-specific slot of the period, and the number of uplink symbols immediately preceding the last slot among the slots composed only of uplink symbols. Further, when the terminal receives information regarding each symbol type within a slot from the base station by means of a cell-specific RRC signal, the information regarding each symbol type may include at most two slot patterns. At this time, each of the two patterns may be applied continuously in the time domain with respect to the symbols. The downlink symbols, uplink symbols, and flexible symbols configured based on the cell-specific RRC signal or SIB1 can be called cell-specific downlink symbols, cell-specific uplink symbols, and cell-specific flexible symbols, respectively.

[0103] When the terminal receives information regarding each symbol type within a slot from the base station by means of a UE-specific RRC signal, the cell-specific flexible symbol may be configured as a downlink symbol or an uplink symbol. At this time, the information regarding each symbol type may include at least any one of an index for the slot within the configured period, the number of downlink symbols from the first symbol of the slot indicated by the index, and the number of uplink symbols from the last symbol of the slot indicated by the index. Further, the terminal may be configured such that all symbols within the slot are downlink symbols, or all symbols within the slot are uplink symbols. The downlink symbol, uplink symbol, and flexible symbol configured based on the UE-specific RRC signal may be referred to as a UE-specific downlink symbol, a UE-specific uplink symbol, and a UE-specific flexible symbol, respectively.

[0104] The base station can transmit information regarding the slot format to the terminal by using the SFI (slot format indicator) of DCI format 2_0 included in the group common (GC)-PDCCH. The GC-PDCCH may be CRC scrambled with the SFI-RNTI for the terminal that receives the information regarding the slot format. Hereinafter, the SFI transmitted via the GC-PDCCH is referred to as a dynamic SFI.

[0105] The terminal may receive a dynamic SFI via GC-PDCCH and be instructed whether the symbols within a slot are cell-specific flexible symbols, or whether the terminal-specific flexible symbols are downlink symbols, uplink symbols, or flexible symbols. In other words, only the flexible symbols semi-statically configured for the terminal may be instructed by the dynamic SFI to be any one of a downlink symbol, an uplink symbol, or a flexible symbol. The terminal need not expect that the semi-statically configured downlink symbols or uplink symbols will be instructed by the dynamic SFI to be other types of symbols. The terminal can perform blind decoding at each monitoring period set by the base station to receive the GC-PDCCH that transmits DCI format 2_0 including the dynamic SFI. When the terminal performs blind decoding and successfully receives the GC-PDCCH, the terminal can apply the information regarding the slot format indicated by the dynamic SFI starting from the slot in which the GC-PDCCH was received.

[0106] The terminal may be configured with combinations for slot formats that can be indicated by the dynamic SFI from the base station. The slot format combinations are for each of one or more and up to 256 slots, and the terminal may be configured by the dynamic SFI with a slot format combination for any one of the one or more and up to 256 slots. The dynamic SFI may include an index indicating to which slot the slot format combination is applied. Table 3 is a table showing the slot format combinations for each slot (see 3GPP TS38.213).

[0107]

Table 3

[0108] In Table 3, D represents a downlink symbol, U represents an uplink symbol, and F represents a flexible symbol. As shown in Table 3, up to two DL / UL switchings may be allowed within one slot.

[0109] In this specification, "configuration", "setting", and "indication" may be used with the same meaning. That is, "~ is configured", "~ is set", "~ is indicated" may have the same meaning as each other, and similarly, "~ is configured to", "~ is set to", "~ is indicated to" may also have the same meaning as each other.

[0110] Figures 12 to 18 show a sub-band setting method according to an embodiment of the present invention.

[0111] When a terminal is configured or indicated with a slot format in a TDD or FDD system, if a limited time-domain resource is allocated as an uplink resource, problems such as a decrease in uplink coverage, an increase in latency, and a decrease in capacity may occur. To solve such problems, a specific time-domain resource within a cell may be used for both downlink reception and uplink transmission. Even if a base station uses a specific time-domain resource for both downlink reception and uplink transmission, a terminal can support only a half-duplex communication method and perform only one of downlink reception or uplink transmission operations in the same specific time-domain resource.

[0112] The specific time-domain resource may be a cell-specific flexible symbol in a semi-statically configured slot format. This is to minimize inter-UE interference caused by transmission and reception in different symbol types (DL / UL or UL / DL).

[0113] Referring to FIG. 12, the terminal may be configured with semi-static cell-specific slots. The terminal can perform downlink reception or uplink transmission on resources scheduled from the base station. The resources scheduled for PDSCH reception for the first UE and the resources scheduled for PUSCH transmission for the second UE may include the same symbol in the time domain, but may be different RBs in the frequency domain. A method of scheduling a single base station to use specific time-domain resources for both downlink reception and uplink transmission for multiple UEs would be inefficient considering inter-cell interference, spectrum regulation, and power consumption for PDCCH monitoring at the terminal. Below, a method for solving such an inefficient situation will be described. In this specification, a sub-band may be set on frequency-domain resources within time-domain resources (slots or symbols). At this time, the frequency-domain resources may be included within the carrier bandwidth of the terminal.

[0114] Spectrum partitioning

[0115] The terminal may be configured with a specific time-domain resource (cell-specific flexible slot / symbol) that can be used for both downlink reception and uplink transmission from the base station in the form of multiple sub-bands in the frequency domain. The multiple sub-bands may be sub-bands of the same or different formats. The sub-band format may include a downlink sub-band, an uplink sub-band, and a flexible sub-band. The downlink sub-band may be composed of one or more downlink RBs, the uplink sub-band may be composed of one or more uplink RBs, and the flexible sub-band may be composed of one or more flexible RBs. A downlink RB can mean a resource available for downlink reception, and an uplink RB can mean a resource available for uplink transmission. A flexible RB can mean a resource that can support both downlink reception and uplink transmission depending on the base station's configuration.

[0116] (Method 1-1) When the terminal constitutes a plurality of sub-bands, the maximum number of sub-bands of the same format may be 1. That is, one cell-specific flexible slot / symbol section may be composed of a maximum of 1 downlink sub-band, 1 uplink sub-band, and 1 flexible sub-band respectively. Referring to FIG. 13, the cell-specific flexible slot / symbol may be composed of a plurality of sub-bands. At this time, the plurality of sub-bands may be composed of 1 downlink sub-band, 1 uplink sub-band, and 1 flexible sub-band respectively. In order to minimize the influence of UL / DL interference between the downlink sub-band and the uplink sub-band, a guard band may be required. Limiting the sub-bands of the same format to only one can minimize the number of guard bands and increase the efficiency of frequency resources during downlink reception and uplink transmission by configuring the downlink sub-band, the uplink sub-band, and the flexible sub-band.

[0117] (Method 1-2) Also, when the terminal constitutes a plurality of sub-bands, the number of sub-bands of the same format may be more than 1. That is, one cell-specific flexible slot / symbol section may have more than 1 of the downlink sub-band, the uplink sub-band, and the flexible sub-band. Referring to FIG. 14, the cell-specific flexible slot / symbol may be composed of a plurality of sub-bands. At this time, the plurality of sub-bands may be composed of 1 downlink sub-band, 2 uplink sub-bands, and 2 flexible sub-bands.

[0118] The plurality of sub-bands in Method 1-1 and Method 1-2 may be composed of non-overlapping RBs in the frequency domain.

[0119] In Method 1-1 and Method 1-2, the flexible subbands may be configured considering the guard band between the uplink subbands and the downlink subbands. That is, there may be at least one flexible subband between the uplink subbands and the downlink subbands. Method 1-1 may have a smaller number of required guard bands compared to Method 1-2. Therefore, more resources may be available for downlink reception and uplink transmission. Also, compared to Method 1-2, in Method 1-1, when CORESET resources for PDCCH monitoring are configured for the terminal, more frequency resources can be used, so the CORESET can be flexibly configured within one downlink subband (or flexible subband). Also, compared to Method 1-2, the frequency domain resources available for uplink transmission may also increase in Method 1-1. Therefore, Method 1-1 may be advantageous in terms of the utilization efficiency of frequency resources compared to Method 1-2. Hereinafter, the method described in this specification is based on Method 1-1, but is not limited thereto. In this specification, the RBs in the downlink subbands are called downlink RBs, the RBs in the uplink subbands are called uplink RBs, and the RBs in the flexible subbands are called flexible RBs.

[0120] The method of configuring a plurality of subbands in the frequency domain may be applied not only to cell-specific flexible slots or symbols, but also to cell-specific downlink slots or symbols or cell-specific uplink slots or symbols. Therefore, the terminal may configure a plurality of subbands in the frequency domain for the cell-specific downlink slots or symbols and the cell-specific flexible slots or symbols. Or, the terminal may configure a plurality of subbands in the frequency domain for the cell-specific uplink slots or symbols and the cell-specific flexible slots or symbols.

[0121] The method of configuring a plurality of sub-bands in the frequency domain may be applied to terminal-specific flexible slots or symbols. Also, the method of configuring a plurality of sub-bands in the frequency domain may be applied to terminal-specific downlink slots or symbols.

[0122] Semi-static subband format configuration

[0123] The terminal may be semi-statically configured with sub-bands by a cell-specific RRC signal or SIB1. The terminal can receive information for sub-band configuration from the base station semi-statically and configure the sub-bands. The information for sub-band configuration may include information related to the position of the sub-bands and information related to the type of sub-bands (type of RBs).

[0124] (Method 2-1) The terminal may receive information for sub-band configuration from the base station and set the number of downlink RBs and the number of uplink RBs. At this time, the information for sub-band configuration may include at least any one of the index for any one slot within the period, the number of uplink RBs from the first RB of the slot corresponding to the index, the number of downlink RBs, the number of downlink RBs from the last RB of the slot corresponding to the index, the number of uplink RBs, and information regarding the positions of the downlink sub-band and the uplink sub-band. Among the RBs within a slot, the RBs not set as downlink RBs or uplink RBs may be determined as flexible RBs. Referring to FIG. 15, 1) the index for the slot is n, 2) X RBs from the first RB of slot n are uplink RBs, and 3) Y RBs from the last RB of slot n may be downlink RBs. 4) The sub-band composed of X RBs from the first RB of slot n may be the uplink sub-band, and the sub-band composed of Y RBs from the last RB of slot n may be the downlink sub-band. Or, conversely to FIG. 15, the sub-band composed of X RBs from the first RB of slot n may be set as the downlink sub-band, and the sub-band composed of Y RBs from the last RB of slot n may be set as the uplink sub-band.

[0125] (Method 2-2) The terminal may receive information for sub-band configuration from the base station and set the number of flexible RBs and the starting RB. At this time, the information for sub-band configuration may include at least any one of the index for any one slot within a period, the index of the first flexible RB among the flexible RBs of the slot corresponding to the index, the number of flexible RBs of the slot corresponding to the index, and information regarding the positions of the downlink sub-band and the uplink sub-band. Among the RBs within a slot, the RBs not configured as flexible RBs may be determined as downlink RBs and uplink RBs. Referring to FIG. 16, 1) the index for the slot is n, 2) the index of the first flexible RB of slot n is X, 3) only Y RBs from X are flexible sub-bands, and 4) the sub-bands excluding the flexible sub-band in slot n may be set as the downlink sub-band and the uplink sub-band. That is, the uplink sub-band may be configured with the RBs from the first RB of slot n to before the first flexible RB of the flexible sub-band, and the downlink sub-band may be configured with the RBs from the last RB of slot n to after the last RB of the last flexible sub-band. Conversely, the downlink sub-band may be configured with the RBs from the first RB of slot n to the first flexible RB of the flexible sub-band, and the uplink sub-band may be configured with the RBs from the last RB of slot n to the last RB of the last flexible sub-band.

[0126] (Method 2-3) The terminal can receive information for sub-band configuration from the base station. Based on the information for sub-band configuration, the terminal can set the uplink (or downlink) start RB, the number of uplink (or downlink) RBs, and the number of flexible RBs. Specifically, the information for sub-band configuration may include information regarding any one of the index for any one slot within a period, the start index of the uplink (or downlink) RB of the slot corresponding to the index, the number of uplink (or downlink) RBs of the slot corresponding to the index, and the number of flexible RBs of the slot corresponding to the index. The terminal can determine an RB not set as an uplink (or downlink) RB or a flexible RB as a downlink (or uplink) RB.

[0127] The number of flexible RBs may not be set by the base station. It may not be pre-configured for the guard band, and a flexible sub-band may be determined by applying a pre-defined number of RBs for the guard band.

[0128] The flexible sub-band may be located between the downlink sub-band and the uplink sub-band. Therefore, there is an effect that the terminal can determine the flexible position without being separately instructed on the start index of the flexible RB.

[0129] In Methods 2-1, 2-2, and 2-3, the information for sub-band configuration may be commonly transmitted to terminals within a cell. At this time, the downlink RBs, uplink RBs, and flexible RBs set for each terminal may be set in units of CRBs (common resource blocks). Also, in Methods 2-1, 2-2, and 2-3, the information for sub-band configuration may be transmitted to a specific terminal within a cell. At this time, the downlink RBs, uplink RBs, and flexible RBs set for each terminal may be set in units of PRBs (physical resource blocks).

[0130] Methods 2-1, 2-2, and 2-3 have the effect that all sub-band related information can be confirmed even when the terminal partially receives information for sub-band configuration. In Methods 2-1 and 2-2, the RBs in the semi-static downlink sub-band can be semi-static downlink RBs, the RBs in the semi-static uplink sub-band can be semi-static uplink RBs, and the RBs in the semi-static flexible sub-band can be semi-static flexible RBs.

[0131] The method of semi-statically setting sub-bands based on Methods 2-1, 2-2, and 2-3 may include cell-specific flexible slots or symbols, may include cell-specific downlink slots or symbols, and may include cell-specific uplink slots or symbols. Therefore, the terminal may be semi-statically set sub-bands for cell-specific downlink slots or symbols and cell-specific flexible slots or symbols. Or, the terminal may be semi-statically set sub-bands for cell-specific uplink slots or symbols and flexible slots or symbols. Or, the method of semi-statically setting sub-bands based on Methods 2-1, 2-2, and 2-3 may include terminal-specific flexible slots or symbols. Also, the method of semi-statically setting sub-bands based on Methods 2-1, 2-2, and 2-3 may include terminal-specific downlink slots or symbols.

[0132] Using cell-specific RRC signals or SIB1 or terminal-specific RRC signals, the terminal can perform the method of semi-statically setting sub-bands based on Methods 2-1, 2-2, and 2-3.

[0133] The index for any one slot among the slots within the period included in the information for the above-described sub-band configuration may be plural. That is, the terminal may configure sub-bands for a plurality of slots within the period.

[0134] Dynamic subband format indication

[0135] The terminal may configure (set / indicate) the sub-band format by dynamic signaling. That is, the terminal may set the sub-band format by DCI transmitted on the PDCCH. If the terminal does not receive semi-static format configuration, the terminal may regard all frequency domain resource blocks in the slot as semi-static flexible sub-bands. And the terminal may be dynamically indicated of the sub-band format by DCI. That is, the semi-static downlink sub-band and the semi-static uplink sub-band configured by semi-static format configuration are not indicated as another format by DCI. When the semi-static sub-band format is not configured for the terminal, the terminal may apply the sub-band format indicated by DCI for the cell-specific flexible slot / symbol. The sub-band format indicated by DCI may be called a dynamic sub-band.

[0136] The terminal may be indicated of the sub-band resource blocks in the frequency domain by the RIV method, which is a method of indicating resources scheduled continuously in the frequency domain in the NR system. The RIV may be a value in which the start RB index and the number of continuously allocated RBs are joint-coded. Equation 1 shows a method of determining the RIV (see 3GPP TS38.214). [Equation 1] [Number] Here, L RBs is the number of continuously allocated RBs, RB start is the start RB index, N size BWP may be the BWP size of the terminal. For example, when N size BWP is 4, the representable start RB index and the number of continuously allocated RBs may be as shown in Table 4 below.

[0137] [Table 4]

[0138] In Table 4, S represents the starting RB index, and L represents the number of consecutively allocated RBs. According to Table 4, when N size BWP is 4, the RIV value may be one of 0 to 9. The terminal can determine the starting RB index and the number of consecutively allocated RBs according to the indicated RIV value. For example, when the terminal is instructed with a RIV value of 5, the terminal can confirm that two consecutive RBs starting from RB#1 in the frequency domain are allocated.

[0139] Hereinafter, a method by which a terminal is instructed by a base station in the form of RIV of a sub-band format in the frequency domain by DCI will be described.

[0140] (Method 3-1) The terminal may be instructed by the base station with the downlink RB number and the uplink RB number according to the information for the configuration of the sub-band. The terminal may be instructed with one value jointly coded as the downlink and uplink RB numbers. When the one value is obtained in the form of RIV, the one value may be determined by Equation 2. [Equation 2] [Number] Here, L 1 RBs is the number of the first RB allocated consecutively, and L 2 RBs can mean the number of the second RB allocated consecutively. When the sub-band format is configured semi-statically for the terminal, N size F may be the size of the flexible sub-band among the semi-statically configured sub-band formats. When the sub-band format is not configured semi-statically for the terminal, N size F may be the size of the entire carrier bandwidth. For example, when N size F is 4, the number of two consecutively allocated RBs may be as shown in Table 5.

[0141]

Table 5

[0142] In Table 5, L1 may be the number of the first RBs allocated continuously, and L2 may be the number of the second RBs allocated continuously. According to Table 5, N size F If is 4, the RIV value may be any one of the values from 0 to 14. The terminal can determine the number of RBs continuously allocated to the downlink and uplink sub-bands according to the indicated RIV value. That is, the terminal can determine L1 as the number of RBs continuously allocated in the uplink sub-band and L2 as the number of RBs continuously allocated in the downlink sub-band. Conversely, the terminal can determine L1 as the number of RBs continuously allocated in the downlink sub-band and L2 as the number of RBs continuously allocated in the uplink sub-band.

[0143] When the terminal determines the number of RBs continuously allocated to the uplink (or downlink) sub-band and the downlink (or uplink) sub-band as L1 and L2 respectively, the terminal can implicitly determine the start RB index of each sub-band according to the semi-statically configured sub-band format. Specifically, when L1 and L2 indicated for the semi-static flexible sub-band by Method 3-1 are applied, the start RB of the downlink sub-band may be determined as the RB before or after the cell-specific downlink sub-band configured semi-statically, and the start RB of the uplink sub-band may be determined as the RB after or before the cell-specific uplink sub-band configured semi-statically. Also, the RBs not determined as the dynamic downlink sub-band and the dynamic uplink sub-band in the semi-static flexible sub-band may be determined as the dynamic flexible sub-band. Referring to FIG. 17, the terminal may be instructed to set L1 as the number of RBs continuously allocated to the dynamic uplink sub-band and L2 as the number of RBs continuously allocated to the dynamic downlink sub-band for the semi-static flexible sub-band. Also, in the semi-static sub-band configuration, the semi-static uplink sub-band may be configured from the first RB of slot n to the RB before the RB of the first dynamic sub-band (dynamic uplink (or downlink) sub-band RB), and the semi-static downlink sub-band may be configured from the last RB of slot n to the RB after the dynamic sub-band RB (dynamic uplink (or downlink) sub-band RB). Therefore, the terminal can determine the RBs of only L1 from the RB next to the semi-statically configured uplink sub-band as the dynamic uplink sub-band, and can determine the RBs of only L2 from the RB before the semi-statically configured downlink sub-band as the dynamic downlink sub-band. The terminal can determine the RBs not indicated as the dynamic downlink sub-band or the dynamic uplink sub-band in the semi-static flexible sub-band as the dynamic flexible sub-band.

[0144] (Method 3-2) The terminal may be instructed of the index of the starting RB of the flexible subband and the number of RBs as information for the subband configuration. The terminal may be instructed of one value jointly coded as the index of the starting RB of the flexible subband and the number of RBs. When one value is determined in the form of RIV, one value may be obtained by Equation 1. At this time, N in Equation 1 size BWP is replaced by N size F is used, and N size F is the same as the definition in Equation 2. Also, the RBs not determined as the dynamic flexible subband may be determined as the dynamic downlink subband and the dynamic uplink subband. At this time, the dynamic downlink subband and the dynamic uplink subband may be composed of RBs that are continuous in the frequency domain with the semi-statically configured semi-static downlink subband and semi-static uplink subband. Referring to FIG. 18, the dynamic flexible subband may be located within the semi-static flexible subband. S may be the index of the starting RB of the dynamic flexible subband, and L may be the number of RBs continuously allocated to the dynamic flexible subband. The terminal can determine the dynamic flexible subband based on the index of the starting RB set for the semi-static flexible subband and the number of continuous RBs. The terminal can determine the RBs not set as the dynamic flexible subband among the semi-static flexible subbands as the RBs of the dynamic downlink subband and the dynamic uplink subband. The terminal can determine the RBs continuous with the semi-static downlink subband among the RBs not set for the configuration of the dynamic flexible subband as the RBs of the dynamic downlink subband. The terminal can determine the RBs continuous with the semi-static uplink subband among the RBs not instructed as the dynamic flexible subband as the RBs of the dynamic uplink subband.

[0145] In Methods 3-1 and 3-2, the unit of the RB may be PRB.

[0146] (Method 3-3) The base station can instruct the terminal about the index of the starting RB of the uplink (or downlink) sub-band and the number of RBs. The terminal may be instructed by the base station with a single value coded jointly as the index of the starting RB and the number of RBs. At this time, the single value coded jointly can be obtained by the said formula 1. The terminal can determine the RBs not indicated as uplink (or downlink) RBs as downlink (or uplink) RBs or flexible RBs. Also, the number of flexible RBs may be the number of flexible RBs that the terminal has set semi-statically or determined. The terminal can determine the RBs that are not uplink (or downlink) RBs or flexible RBs as downlink (or uplink) RBs.

[0147] The flexible sub-band may be located between the downlink sub-band and the uplink sub-band. Therefore, the terminal can clearly confirm the position of the flexible sub-band without being separately instructed about the starting index of the flexible RBs.

[0148] In Methods 3-1, 3-2, and 3-3, the dynamic downlink sub-band, the dynamic uplink sub-band, and the dynamic flexible sub-band may be composed of RBs that are continuous in the frequency domain.

[0149] In Methods 3-1, 3-2, and 3-3, the information for sub-band configuration may be transmitted commonly to the terminals within the cell. At this time, the downlink RBs, uplink RBs, and flexible RBs set for each terminal may be set in units of CRB (common resource block).

[0150] When the terminal is instructed with dynamic sub-band formats by Methods 3-1, 3-2, and 3-3, the sub-band format information may be sent to the terminal by group common signaling. For example, the dynamic sub-band format information may be included in DCI format 2_0 used in legacy NR. DCI format 2_0 may be transmitted on GC-PDCCH, and GC-PDCCH may be CRC scrambled with SFI-RNTI for the terminal that receives the sub-band format information. The terminal can perform blind decoding at each monitoring period set by the base station to receive the GC-PDCCH including DCI format 2_0 containing the sub-band format information. When the terminal performs blind decoding and successfully receives the GC-PDCCH, the terminal can apply the sub-band format information in the monitoring period set by the base station from the slot where the PDCCH is received. Also, the dynamic sub-band format information may be transmitted in a new DCI format (e.g., DCI format 2_x) instead of the DCI format used in legacy NR. DCI format 2_x may be transmitted on GC-PDCCH, and GC-PDCCH can transmit SFI-F (slot formation indication in Frequency domain) to inform the terminal that receives the sub-band format information of the slot format in the frequency domain. SFI-F may be CRC scrambled with SFIF-RNTI. Blind decoding can be performed at each monitoring period set by the base station to receive the PDCCH including DCI format 2_x. When the terminal performs blind decoding and successfully receives the GC-PDCCH, the terminal can apply the sub-band format information in the monitoring period set by the base station from the slot where the GC-PDCCH is received.

[0151] When the terminal sets the dynamic sub - band format according to Method 3 - 1, the payload size of DCI format 2_0 or DCI format 2_x including the dynamic sub - band format information is

Number

Number

Number

[0152] The RBs in the dynamic downlink sub - band determined by Method 3 - 1, 3 - 2, 3 - 3 can be called dynamic downlink RBs, the RBs in the dynamic uplink sub - band can be called dynamic uplink RBs, and the RBs in the dynamic flexible sub - band can be called dynamic flexible RBs.

[0153] The method of dynamically indicating sub - bands based on Method 3 - 1, 3 - 2, 3 - 3 may be applied to cell - specific flexible slots or symbols, and may be applied to cell - specific downlink slots or symbols or uplink slots or symbols. Therefore, the terminal may be dynamically instructed to sub - bands for cell - specific downlink slots or symbols and cell - specific flexible slots or symbols. Also, the terminal may be dynamically instructed to sub - bands for cell - specific uplink slots or symbols.

[0154] The method in which the terminal dynamically sets a sub-band based on Methods 3-1, 3-2, and 3-3 may be applied to terminal-specific flexible slots or symbols. Also, the method in which the terminal dynamically sets a sub-band based on Methods 3-1, 3-2, and 3-3 may be applied to terminal-specific downlink slots or symbols.

[0155] Uplink transmission

[0156] A method for a terminal to transmit a physical uplink shared channel (PUSCH) will be described. The terminal can transmit uplink data (e.g., UL-SCH TB) to the base station via the PUSCH. At this time, the terminal can transmit uplink data by a method of scheduling the PUSCH from DCI in the PDCCH (DG, dynamic grant), or by a method of transmitting the PUSCH according to a resource and a transmission method preset by the base station (CG, configured grant).

[0157] The DCI obtained by the terminal decoding the PDCCH may include PUSCH scheduling information. The PUSCH scheduling information may include information regarding the time domain (hereinafter, TDRA, time-domain resource assignment), and information regarding the frequency domain (hereinafter, FDRA, frequency-domain resource assignment). The terminal can analyze the DCI transmitted on the PDCCH based on the information of the control resource set (CORESET) and the search space, and perform the operation indicated by the DCI. The DCI format for scheduling the PUSCH may be one of DCI formats 0_0, 0_1, or 0_2.

[0158] The time domain information of the PUSCH indicated by the TDRA field in DCI formats 0_0, 0_1, or 0_2 includes the following. - K2: It is the offset value between (i) the slot in which the terminal receives PDCCH from the base station and (ii) the slot in which the terminal transmits PUSCH to the base station. - SLIV (starting and length indication value): It is the value in which the start symbol index (S) of PUSCH and the symbol length (L) of PUSCH are jointly coded within the slot indicated by the K2 value. The terminal may be configured with K2 and SLIV from the base station. Alternatively, the terminal may be configured with K2, S, and L from the base station.

[0159] If the terminal receives DCI (e.g., DCI format 0_0, 0_1, or 0_2) for scheduling PUSCH in slot n, it determines slot floor(n*2 μPUSCH / n*2 μPDCCH ) + K2 as the slot for transmitting PUSCH. Here, μPUSCH and μPDCCH are the SCSs of the cell (or BWP) in which PUSCH is scheduled and the cell (or BWP) in which PDCCH is received, respectively.

[0160] The PUSCH may be configured as one of PUSCH mapping Type A or PUSCH mapping Type B. When the terminal is configured with PUSCH mapping Type A, only the PUSCH resource containing DMRS symbols may be allocated, and the DMRS symbols are located at the third or fourth symbol of the slot indicated by the K2 value according to the value configured by the base station. That is, when the terminal is configured with PUSCH mapping Type A, the start symbol index (S) of the PUSCH is 0, and one of the values from 4 to 14 (12 in the case of extended CP) may be configured / indicated for the symbol length (L) of the PUSCH, or one of the values from 4 to 14 (12 in the case of extended CP) may be configured / indicated for the SLIV. When the terminal is configured with PUSCH mapping Type B, the first symbol of the PUSCH is at least a DMRS symbol, and one of the values from 0 to 13 (11 in the case of extended CP) may be configured for the start symbol index of the PUSCH, and one of the values from 1 to 14 (12 in the case of extended CP) may be configured for the symbol length of the PUSCH. Or, when the terminal is configured with PUSCH mapping Type B and PUSCH repetition Type A, one of the values from 1 to 14 (12 in the case of extended CP) may be configured for the SLIV. When the terminal is configured with PUSCH mapping Type B and PUSCH repetition Type B, one of the values from 1 to 27 (23 in the case of extended CP) may be configured for the SLIV.

[0161] The frequency domain information of the PUSCH indicated by the FDRA field in DCI format 0_0, 0_1, or 0_2 can be classified into two categories according to the uplink resource allocation type.

[0162] In the case of uplink resource allocation type 0, a fixed number of PRBs included in the BWP configured for the terminal are grouped into an RBG (resource block group), and the terminal determines whether to use the RBG by being instructed with a bitmap in units of RBGs. The number of PRBs included in one RBG may be configured by the base station. It may be configured such that the larger the number of PRBs included in the BWP configured for the terminal, the more PRBs are included in one RBG. If the bit value indicated by the bitmap is 0, the terminal determines / analyzes that no PUSCH is scheduled for any of the PRBs within the RBG, and if the bit value is 1, the terminal determines / analyzes that PUSCH is scheduled for all the PRBs within the RBG. Alternatively, depending on the implementation method, the bit value may be applied inversely.

[0163] In the case of uplink resource allocation type 1, the resource allocation information can indicate information on consecutive PRBs allocated for uplink transmission. The resource allocation information includes an RIV (resource indication value) value in which the start index and length of consecutive PRBs are jointly coded in the frequency domain. The RIV value may be defined to indicate the start index and length of consecutive PRBs based on the size of the initial or active BWP of the terminal.

[0164] For DCI format 0_1 or 0_2 only, the terminal may be configured to use only one of the two uplink resource allocation types from the base station or to use the two types dynamically. When configured to use the two uplink resource allocation types dynamically, the terminal can determine the uplink resource allocation type to be used for PUSCH transmission by the 1-bit MSB (most significant bit) of the FDRA field within DCI format 0_1 or 0_2.

[0165] The NR system supports the CG (configured grant)-based PUSCH (hereinafter referred to as CG-PUSCH) transmission mode to assist uplink URLLC transmission and the like. The CG-PUSCH transmission mode is also called the grant-free transmission mode. The CG-PUSCH transmission mode is a mode in which a terminal receives from a base station the resources available for PUSCH transmission, which are pre-configured by a higher layer (e.g., RRC) signal, and transmits PUSCH using the resources. The CG-PUSCH transmission mode can be classified into the following two types according to the availability of activation or release using DCI.

[0166] - Type 1 PUSCH transmission with configured grant: A terminal may receive from a base station the period, time / frequency resources, and transmission mode for PUSCH transmission, which are pre-configured by a higher layer (e.g., RRC) signal. Here, the transmission mode may include MCS (modulation and coding scheme), TBS (TB size), and the like.

[0167] -Type 2 PUSCH transmission with configured grant: A terminal may receive from a base station the period for PUSCH transmission, which is configured by a higher layer (e.g., RRC) signal, and the time / frequency resources and transmission mode may be indicated by DCI (PDCCH).

[0168] The CG-PUSCH transmission mode can support PUSCH retransmission in multiple slots to ensure reliable uplink transmission. At this time, the terminal and the base station define the time point that can be assumed as the starting point of CG-PUSCH transmission as follows. The terminal is configured with one of the RV (redundancy version) sequences {0, 2, 3, 1}, {0, 3, 0, 3}, or {0, 0, 0, 0} for the retransmission of CG-PUSCH, and uses the RV value corresponding to the {mod(n - 1, 4)+1}-th value at the n-th initial TO (transmission occasion). Here, n is an integer greater than 0. At this time, the terminal can determine the initial TO at which retransmission can be started according to the configured RV sequence as follows.

[0169] - When the RV sequence is set to {0, 2, 3, 1}: The first TO corresponding to RV = 0 may be determined as the initial TO. The terminal may start the retransmission of CG-PUSCH from the first TO corresponding to RV = 0, and the base station attempts to receive the retransmission of CG-PUSCH assuming that the retransmission of the terminal may start.

[0170] - When the RV sequence is set to {0, 3, 0, 3}: The TO corresponding to RV = 0 may be determined as the initial TO. The terminal may start the retransmission of CG-PUSCH from the TO corresponding to RV = 0, and the base station attempts to receive the retransmission of CG-PUSCH assuming that the retransmission of the terminal may start.

[0171] - When the RV sequence is set to {0, 0, 0, 0}: All TOs corresponding to RV = 0 except the last TO may be determined as the initial TO. The terminal may start the retransmission of CG-PUSCH at all TOs corresponding to RV = 0 except the last TO, and the base station attempts to receive the retransmission of CG-PUSCH assuming that the retransmission of the terminal may start.

[0172] In a wireless communication system, in order to improve the reliability of PUSCH transmission and reception between a base station and a terminal, the terminal may be set to perform iterative transmission of PUSCH from the base station. The PUSCH iterative transmissions that the terminal can perform can be classified into two types.

[0173] First, the transmission process of PUSCH iterative transmission type A of the terminal is as follows. If the terminal receives DCI formats 0_1 to 0_2 in the PDCCH that schedules PUSCH from the base station, PUSCH iterative transmission can be performed in K consecutive slots. Here, the K value may be set by the upper layer (e.g., RRC) or indicated by the value of the TDRA field in the DCI. At this time, the time / frequency resource in which PUSCH is transmitted in each slot is the same as the time / frequency resource indicated by the DCI. That is, PUSCH may be iteratively transmitted in the same symbol and PRB within each slot.

[0174] Next, in order to support low-latency PUSCH iterative transmission to meet requirements such as those of URLLC, the transmission process of PUSCH iterative transmission type B is as follows. The terminal may be instructed by the TDRA field of the start symbol (S) and the length (L) of PUSCH from the base station. Here, the PUSCH having the start symbol and length indicated by the TDRA field is not the actually transmitted PUSCH but the temporarily obtained PUSCH, which is called the nominal PUSCH. Also, the terminal may be instructed by the TDRA field of the nominal number of repetitions (N) of the nominal PUSCH. Therefore, the terminal can determine N nominal PUSCHs based on the TDRA field. The lengths of the N nominal PUSCHs are L and are all the same, and there is no other symbol between the nominal PUSCHs and they are continuous on the time axis.

[0175] The terminal can determine the actual PUSCH from the nominal PUSCH. One nominal PUSCH may be determined to be one or more actual PUSCHs. The terminal may be instructed / set by the base station with symbols that cannot be used in PUSCH repetition transmission type B. This is called an invalid symbol. The invalid symbol may include a symbol composed of DL symbols according to the TDD configuration, a symbol with SS / PBCH block reception set, a symbol with CORESET reception associated with Type0-PDCCH CSS set, and a symbol set for DL-to-UL switching. The terminal can exclude the invalid symbol in the nominal PUSCH. As described above, the nominal PUSCH is determined as consecutive symbols, but when excluding the invalid symbol, it may be determined as non-consecutive symbols. The actual PUSCH may be determined as consecutive symbols in one nominal PUSCH excluding the invalid symbol. Here, when the consecutive symbols cross the slot boundary, the actual PUSCH may be divided based on the slot boundary.

[0176] A method for the terminal to transmit a physical uplink control channel (PUCCH) will be described.

[0177] When the terminal receives a DCI format (e.g., DCI format 1_0, 1_1, or 1_2) that schedules PUCCH, the terminal must transmit the scheduled PUCCH. The PUCCH may include UCI, and the UCI may include HARQ-ACK, SR, and / or CSI information. The HARQ-ACK information may be HARQ-ACK information regarding the reception success or failure of two types of channels. As the first type, when PDSCH is scheduled by DCI format 1_0, 1_1, or 1_2, the HARQ-ACK information may be HARQ-ACK regarding the reception success or failure of the PDSCH. As the second type, when DCI format 1_0, 1_1, or 1_2 indicates the release of a semi-static physical downlink shared channel (SPS PDSCH) (hereinafter, DL SPS release), the HARQ-ACK information may be HARQ-ACK regarding the reception success or failure of the DCI format 1_0, 1_1, or 1_2 (or DL SPS release).

[0178] To transmit a PUCCH that conveys HARQ-ACK, the PDSCH-to-HARQ_feedback timing indicator field included in DCI format 1_0, 1_1, or 1_2 can indicate a slot offset K1 for the slot in which the scheduled PUCCH must be transmitted. Here, the value of K1 may be a non-negative integer value. The K1 value of DCI format 1_0 can indicate one value among {0, 1, 2, 3, 4, 5, 6, 7}. The K1 value that can be indicated by DCI format 1_1 or 1_2 may be configured or set from a higher layer (e.g., RRC).

[0179] The terminal can determine the slot for transmitting the PUCCH containing the first type of HARQ-ACK information as follows. The terminal can determine the uplink slot that overlaps with the last symbol of the PDSCH corresponding to the HARQ-ACK information. When the index of the uplink slot is m, the uplink slot for the terminal to transmit the PUCCH containing the HARQ-ACK information may be m + K1. Here, the index of the uplink slot is a value based on the subcarrier spacing of the (uplink) BWP where the PUCCH is transmitted. When the terminal is configured with downlink slot aggregation, the last symbol represents the last symbol of the PDSCH scheduled in the last slot among the slots in which the PDSCH is received.

[0180] In the NR system, in order to ensure wide coverage, the terminal may be configured to repeatedly transmit the long PUCCH (PUCCH format 1, 3, 4) in 2, 4, or 8 slots. When the terminal is configured to repeatedly transmit the PUCCH, the same UCI may be repeatedly transmitted in each slot. The symbol configuration of the repeatedly transmitted PUCCH is the same. That is, the repeatedly transmitted PUCCH starts from the same symbol in each slot and is composed of the same number of symbols.

[0181] When the terminal performs PUCCH repeated transmission, if the symbol that must transmit the PUCCH in a specific slot overlaps with an invalid symbol (for example, a DL symbol semi-statically configured by the TDD configuration or a symbol configured for receiving the SS / PBCH block), the terminal may not transmit the PUCCH in that slot and postpone the PUCCH transmission to the next slot. Then, if the symbol that must transmit the PUCCH in the slot where the PUCCH transmission is postponed does not overlap with an invalid symbol, the terminal can transmit the PUCCH in that slot.

[0182] Frequency hopping of the uplink channel

[0183] When the terminal transmits a UL channel (e.g., PUSCH or PUCCH), it can use a frequency hopping method to obtain a frequency diversity gain. Here, the frequency hopping method refers to transmitting the UL channel on PRB set #0 and transmitting the UL channel on PRB set #1. PRB set #0 and PRB set #1 are different from each other. For convenience, in the following description, the UL channel transmitted on PRB set #0 is called hop 0, and the UL channel transmitted on PRB set #1 is called hop 1. In the following description, only a maximum of two hops (e.g., hop 0 and hop 1) are described, but the number of hops may be more.

[0184] When the terminal transmits PUSCH or PUCCH, the method for determining the PRB set of hop 0 (i.e., PBB set #0) and the PRB set of hop 1 (i.e., PBB set #1) is as follows.

[0185] First, the frequency hopping during PUCCH transmission will be described.

[0186] Before RRC connection, in the case of PUCCH, the PRB set for frequency hopping may be determined as follows. For reference, the PUCCH before RRC connection includes a PUCCH that transmits a HARQ-ACK which is a reception success response of a PDSCH (hereinafter, Msg4 PDSCH) including Msg4 (message 4) in the RACH (random access channel) process.

[0187] Before RRC connection (i.e., before the terminal-specific PUCCH resources are configured), the terminal obtains 4-bit information from system information (e.g., RMSI (remaining system information)), and the 4-bit information is used to configure / identify the cell-common PUCCH resource set.

[0188] Table 6 shows a plurality of cell-common PUCCH resource sets. The index corresponds to one cell-common PUCCH resource set and is indicated by 4-bit information in the system information.

[0189]

Table 6

[0190] Subsequently, the terminal can select / determine one PUCCH resource from the cell-common PUCCH resource set indicated by the system information. The one PUCCH resource may be selected / determined based on the PUCCH resource index r PUCCH and may be selected / determined based on r PUCCH r is determined as follows based on the PUCCH resource indicator (PRI) included in the DCI format (e.g., DCI format 1_0, 1_1, or 1_2) for scheduling PUCCH, and the index of the CCE where the DCI format is received (e.g., the smallest CCE index).

Equation

[0191] Combining the cell-common PUCCH resource set and r PUCCH may determine the RB set, frequency hopping direction, initial CS (cyclic shift), etc. used for PUCCH transmission. The cell-common PUCCH resource set supports only PUCCH formats 0 and 1. In the case of PUCCH formats 0 and 1, the PRB set used for PUCCH transmission is composed of 1 PRB.

[0192] r PUCCHhas one value among 0, 1, …, 15. Therefore, the terminal can perform PUCCH transmission using the PUCCH resource corresponding to r PUCCH among the 16 PUCCH resources.

[0193] For example, if r PUCCH is one value among 0, 1, …, 7, the PRB index of hop 0 of the PUCCH resource is

Number

Number

Number

Number

[0194] is the number of PRBs included in the active BWP for transmitting PUCCH. Here, when the PUCCH transmits the HARQ-ACK of Msg4 PDSCH, the active BWP is the initial UL BWP. The initial UL BWP is the UL BWP used by the terminal for cell connection and is configured in SIB1. N size BWP represents the number of initial CS indexes. RB CS and the number of initial CS indexes are shown in Table 6. offset BWP The number of initial CS indexes is shown in Table 6.

[0195] Here, if the index of the PRB of hop 0 is 0, the PRB represents the lowest PRB of the terminal's active BWP. That is, the PRB index of hop 0 is analyzed as the index of the active BWP. When the PUCCH transmits the HARQ-ACK of the Msg4 PDSCH, the active BWP is replaced by the initial UL BWP. That is, the PRB index of hop 0 is analyzed as the index of the initial UL BWP.

[0196] After RRC connection, in the case of PUCCH, the PRB set for frequency hopping may be determined as follows.

[0197] The index of the lowest PRB of the PRB set of hop 0 of the PUCCH (i.e., PRB set #0) and the index of the lowest PRB of the PRB set of hop 1 (i.e., PRB set #1) may be set as PUCCH resources by an RRC signal to the terminal. That is, when the terminal is instructed with one PUCCH resource (PRI in DCI), the terminal can transmit on hop 0 and hop 1 using the index of the lowest PRB of the PRB set of hop 0 and the index of the lowest PRB of the PRB set of hop 1 set in the PUCCH resource. Here, if the index of the PRB is 0, the PRB represents the lowest PRB of the terminal's active BWP. That is, the index of the PRB may be analyzed as the index of the terminal's active BWP.

[0198] Next, frequency hopping during PUSCH transmission will be described. In the case of PUSCH, the PRB set for frequency hopping may be determined as follows. The terminal can determine the PRB set of hop 0 (i.e., PBB set #0) by the DCI that schedules the PUSCH or the DCI / RRC signal that activates the PUSCH. Here, the DCI that schedules the PUSCH or the DCI / RRC signal that activates the PUSCH may include an FDRA field. The FDRA field may include (i) the index of the RB at which the PRB set of hop 0 starts, and (ii) the number of consecutive RBs. Here, if the index of the RB at which the PRB set of hop 0 starts is 0, the RB represents the lowest PRB of the terminal's active BWP. That is, the index of the RB at which the PRB set of hop 0 starts may be analyzed as the index of the terminal's active BWP. For frequency hopping, the terminal must determine the index of the RB at which the PRB set of hop 1 (i.e., PBB set #1) starts. This may be determined by the following formula.

Number

[0199] Here, RB start (0) represents the index of the RB at which the PRB set of hop 0 starts, and RB start (1) represents the index of the RB at which the PRB set of hop 1 starts. RB offset represents the PRB interval between the PRB set of hop 0 and the PRB set of hop 1. The base station can set / indicate RB offset to the terminal, and the value of RB offset may be one of the values 0, 1,..., N size BWP - 1. N size BWPrepresents the number of PRBs included in the active BWP of the UE. If the index of the RB where the PRB set of hop 1 starts, calculated by the above formula, is 0, then the RB represents the lowest PRB of the active BWP of the UE. That is, the index of the RB where the PRB set of hop 1 starts (RB start (1)) may be interpreted as the index of the terminal's active BWP.

[0200] Table 7 shows the PRB offset RB for hop 1 when PUSCH transmits Msg3 in the RACH process (hereinafter referred to as Msg3 PUSCH). offset where N size BWP is the number of RBs included in the initial UL BWP. If the number of RBs included in the initial UL BWP is less than 50 according to Table 7, offset teeth,

number

number

[0201] [Table 7]

[0202] In the case of the initial transmission of Msg3 PUSCH, whether to perform frequency hopping may be indicated by a 1-bit FH flag (frequency hopping flag) in the UL grant of the RAR (Random Access Response) that schedules Msg3 PUSCH. In the case of the retransmission of Msg3 PUSCH, whether to perform frequency hopping may be indicated by a 1-bit FH flag in DCI format 0_0 scrambled by the TC-RNTI that schedules Msg3 PUSCH. If the value of the FH flag is 0, the terminal transmits Msg3 PUSCH without frequency hopping, and if it is 1, the terminal transmits Msg3 PUSCH with frequency hopping.

[0203] Hop 0 described above in this specification may be described as the first hop and hop 1 as the second hop instead.

[0204] When the terminal is set / instructed to transmit PUSCH or PUCCH by a frequency hopping method, it may be set / instructed to use one of the following frequency hopping methods.

[0205] - Intra-slot frequency hopping:

[0206] In the case of PUSCH transmission, the terminal can divide PUSCH into two equal parts in the time domain within the slot in which PUSCH transmission is indicated and map them to two hops for transmission. Here, PUSCH transmission may or may not be PUSCH repetition. When the length of the symbol allocated to PUSCH in one slot is N PUSCH,s symb then, in the first hop, floor(N PUSCH,s symb / 2) symbols are mapped to PUSCH, and in the second hop, {N PUSCH,s symb - floor(N PUSCH,s symbIt is possible to map floor((number of symbols) / 2) symbols to the PUSCH. Here, floor() means the floor function.

[0207] In the case of PUCCH transmission, the terminal can divide the PUCCH into two equal parts in the time domain within the slot in which PUCCH transmission is indicated and map it to two hops for transmission. Here, the PUCCH transmission may or may not be PUCCH repeated transmission. When the length of the symbols allocated to the PUCCH in one slot is referred to as the number of symbols, floor(number of symbols / 2) symbols can be mapped to the PUCCH in the first hop, and number of symbols - floor(number of symbols / 2) symbols can be mapped to the PUCCH in the second hop.

[0208] - Inter-slot frequency hopping:

[0209] In the case of PUSCH repeated transmission, the terminal can map the PUSCH transmission to the first hop or the second hop based on the absolute slot index within the radio frame of the slot in which the PUSCH repeated transmission is included. Here, when the index within the radio frame of the slot in which the PUSCH repeated transmission is included is even, the PUSCH transmission can be mapped to the first hop, and when the index within the radio frame of the slot in which the PUSCH repeated transmission is included is odd, the PUSCH transmission can be mapped to the second hop.

[0210] In the case of PUCCH repeated transmission, the terminal can sequentially assign a repetition slot index based on the first slot in which PUCCH repeated transmission is indicated. The terminal can determine the repetition slot index of the first slot in which PUCCH repeated transmission is indicated as 0. Next, for consecutive slots, the terminal can sequentially assign a repetition slot index regardless of whether there is PUCCH transmission in that slot. The terminal can transmit PUCCH in the first hop in the slot corresponding to the even repetition slot index and transmit PUCCH in the second hop in the slot corresponding to the odd repetition slot index.

[0211] Example: UL frequency hopping to support SBFD (subband non - overlapping full duplex) operation

[0212] The problem to be solved in the present invention relates to the case where the terminal frequency hops and transmits an uplink channel (for example, PUSCH or PUCCH) when the sub-band format is set semi-statically or dynamically indicated.

[0213] For example, the terminal may be set or instructed to set an uplink sub-band for a flexible slot / symbol or a downlink slot / symbol. Also, the terminal may be set or instructed to transmit PUSCH or PUCCH by frequency hopping in the slot / symbol in which the uplink sub-band is set or instructed.

[0214] First, the terms used in the present invention are sorted out.

[0215] - SBFD (subband non - overlapping full duplex): It means a method that supports simultaneous transmission and reception operations using subbands within a cell / BWP. Here, a subband means a frequency band configured / indicated for SBFD operation within a cell / BWP. One subband may be composed of one continuous (P)RB set. For examples regarding subband configuration / formats, refer to FIGS. 12 to 18. For example, in the case of unpaired spectrum (i.e., TDD cell / BWP), a UL subband may be configured on a DL slot / symbol, or a UL subband may be configured on a flexible slot / symbol. Or, in the case of unpaired spectrum, a DL subband may be configured on a UL slot / symbol, or a DL subband may be configured on a flexible slot / symbol. Also, in the case of paired spectrum (i.e., FDD cell / BWP), a UL subband may be configured on a DL BWP, or a DL subband may be configured on a UL BWP. When SBFD operation is configured for a cell / BWP, the cell / BWP may include time - domain TDM - ed SBFD intervals and non - SBFD intervals.

[0216] - SBFD interval: It means a time interval in which subbands are configured / indicated on a cell / BWP. For example, an SBFD interval includes a time interval in which an uplink subband is configured / indicated. For example, an SBFD interval includes a slot in which an uplink subband is configured / indicated. For example, an SBFD interval includes a symbol (or symbol set) in which an uplink subband is configured / indicated. An SBFD interval includes SBFD slots and / or SBFD symbols. An SBFD interval may include one or more subbands in the frequency domain. When multiple subbands are configured in an SBFD interval, the subbands are FDM - ed. Multiple subbands (DL subbands or UL subbands) in an SBFD interval may be configured to not overlap with each other in the frequency domain (non - overlapping).

[0217] - Non-SBFD interval: It means a time interval during which sub-bands are not configured / indicated on a cell / BWP. A non-SBFD interval includes non-SBFD slots and / or non-SBFD symbols. A non-SBFD interval means a legacy interval or a normal interval. A non-SBFD interval includes at least one of DL symbols, flexible symbols, and UL symbols according to the slot format. For example, when SBFD operation is configured / indicated for a UL BWP, the non-SBFD interval includes UL slots / symbols.

[0218] - Determine (frequency) hopping: It means determining a resource (e.g., PRB) corresponding to frequency hopping.

[0219] - Legacy NR system: It means a system that operates in the same way as the existing NR method because SBFD operation is not supported or configured.

[0220] For the sake of convenience, hereinafter, the case where SBFD operation is configured for a UL BWP is exemplified. However, the present invention may be equally applicable when SBFD operation is configured for a TDD cell / BWP.

[0221] 1) PUSCH case

[0222] When the terminal is configured or instructed to transmit PUSCH by frequency hopping in a slot / symbol in which an uplink sub-band is configured, the first hop and the second hop in the frequency domain can be determined by the method described above.

[0223] According to the existing method, the value configured or instructed by the base station for the terminal to determine the first hop or the second hop may be applied equally not only to the slot / symbol in which the sub-band is set but also to other slots / symbols. That is, in the existing method, the value configured or instructed for frequency hopping is applied equally to all slots / symbols regardless of the slot / symbol type. For example, the offset value RB offset configured by the base station for the terminal to determine the second frequency hop may be applied equally not only to the slot / symbol in which the sub-band is set but also to other slots / symbols. In other words, the offset value set by the base station for the terminal for frequency hopping may be applied equally to the slot / symbol in which the sub-band is set and the slot / symbol in which the sub-band is not set. Also, the number of PRBs N size BWP constituting the UL BWP may also be applied equally to the slot / symbol in which the sub-band is set and the slot / symbol in which the sub-band is not set. In this case, the second hop may include a PRB outside the uplink sub-band, and when the PRB is a downlink PRB, there will be a problem that PUSCH cannot be transmitted in the second hop.

[0224] For example, referring to FIG. 19, the terminal may be configured or instructed to repeatedly transmit PUSCH in the (uplink) slots (slot n+1 to slot n+3) and the (uplink) slot (slot n+4) in which the sub-band is not set among the (uplink) slots (slot n to slot n+3) in which the initial (UL) BWP is set cell-wide. Also, the terminal may be configured or instructed to perform intra-slot frequency hopping or inter-slot frequency hopping for the repeated PUSCH transmission. FIG. 19 assumes that the terminal is configured or instructed to perform inter-slot frequency hopping for the repeated PUSCH transmission. According to FIG. 19, the terminal has the size and offset value (RB of the initial (UL) BWP offset) can be used to determine the first hop and the second hop. At this time, in order to maximize the frequency diversity gain in the same way as the method used in the legacy NR system that does not consider the SBFD operation, the terminal may configure an offset value for determining the frequency hop based on a slot (slot n + 4) in which no subband is set. In this case, the second frequency hop may be determined as a PRB outside the uplink subband in the slot (slot n + 2) in which the subband is set. That is, the second hop determined based on the offset value configured based on slot n + 4 is located in a PRB outside the uplink subband in slot n + 2. That is, since the second frequency hop is set at the position of the downlink PRB, the terminal cannot transmit PUSCH in slot n + 2.

[0225] For example, referring to FIG. 20, the terminal #1 and the terminal #2 may each have a configured terminal-specific (UL) BWP activated. Referring to FIG. 20(a), the terminal #1 may be set or instructed to repeatedly transmit PUSCH in the (uplink) slots (slot n+1 to slot n+3) and the (uplink) slot (slot n+4) where the sub-band is not set among the (uplink) slots (slot n to slot n+3) where the sub-band is set. Referring to FIG. 20(b), the terminal #2 may be set or instructed to repeatedly transmit PUSCH in the (uplink) slot (slot n+4) where the sub-band is not set and the (uplink) slots (slot n+5 to slot n+7) among the (uplink) slots (slot n+5 to slot n+8) where the sub-band is set. Also, the terminal #1 and the terminal #2 may be set or instructed to perform in-slot frequency hopping or inter-slot frequency hopping for PUSCH repeated transmission. FIG. 20 assumes that the terminal #1 and the terminal #2 are set or instructed to perform inter-slot frequency hopping for PUSCH repeated transmission. The terminal #1 and the terminal #2 can each determine the first hop and the second hop using (i) the size of the respectively activated terminal-specific (UL) BWP and (ii) the offset value for determining the frequency hop configured from the base station. At this time, in order to maximize the frequency diversity gain as in the method used in the legacy NR system that does not consider the SBFD operation, the terminal may configure the offset value based on the slot (slot n+4) where the sub-band is not set. In this case, the second frequency hop may be determined as a PRB outside the uplink sub-band in the slots where the sub-band is set (slot n+2 in FIG. 20(a), slot n+5 and slot n+7 in FIG. 20(b)). That is, the second hop determined based on the offset value configured based on slot n+4 is located at a PRB outside the uplink sub-band in slots n+2, n+5, and n+7.That is, since the second hop is set at the position of the downlink PRB, the terminal cannot transmit PUSCH in slot n+2, slot n+5, and slot n+7.

[0226] Examples for solving the above problems are disclosed below. Specifically, when the terminal is set or instructed to transmit PUSCH by frequency hopping in the slot / symbol set or instructed in the uplink subband, examples for solving the problem that PUSCH cannot be transmitted because the hop position is set to a resource where uplink transmission is impossible are disclosed.

[0227] Specifically, in the present invention, when frequency hopping is set in the slot or symbol set or instructed as the uplink subband by the terminal, a method is proposed to enable the frequency hop of PUSCH to be located on the uplink transmission area or uplink slot that the terminal can transmit. Further, in the present invention, a method is provided to enable the position of the frequency hop to be set in the same way as in the legacy NR system that does not consider the SBFD operation for the (uplink) slot where the subband is not set / instructed.

[0228] First Embodiment: FIGS. 21 and 22 show the first embodiment.

[0229] Referring to FIG. 21, the terminal may be set or instructed to repeatedly transmit PUSCH in some of the SBFD slots (slot n to slot n+3) (slot n+1 to slot n+3) and the non-SBFD slot (slot n+4) with the initial UL BWP set in a cell common manner. Also, the terminal may be set or instructed to perform inter-slot frequency hopping for the repeated transmission of PUSCH. In FIG. 21, the terminal uses (i) the size of the initial UL BWP and (ii) the offset value (RB) configured by the base station for the terminal to determine the frequency hop. offsetUsing [ ], the first hop and the second hop can be determined. According to the first embodiment, the frequency hop for PUSCH transmission may be set / determined to be located on the uplink sub-band transmission region in the SBFD slots (slots n+1 to n+3), and to have the same position as in the legacy NR system in the non-SBFD slot (slot n+4).

[0230] Referring to FIG. 22, the configured UE-specific UL BWPs of UE #1 and UE #2 may be activated. Referring to FIG. 22(a), UE #1 may be set or instructed to repeatedly transmit PUSCH in some of the SBFD slots (slots n+1 to n+3) and the non-SBFD slot (slot n+4) among the SBFD slots (slots n to n+3). According to the first embodiment, the frequency hop for PUSCH transmission may be set / determined to be located on the uplink sub-band transmission region in the SBFD slots (slots n+1 to n+3), and to have the same position as in the legacy NR system in the non-SBFD slot (slot n+4). Referring to FIG. 22(b), UE #2 may be set or instructed to repeatedly transmit PUSCH in the non-SBFD slot (slot n+4) and some of the SBFD slots (slots n+5 to n+7) among the SBFD slots (slots n+5 to n+8). Also, UE #1 and UE #2 may be set or instructed to perform inter-slot frequency hopping for PUSCH repeated transmission, and the first hop and the second hop can be determined respectively using (i) the sizes of the UE-specific UL BWPs activated for UE #1 and UE #2 respectively and (ii) the offset values for determining the respective configured frequency hops from the base station. According to the first embodiment, the UE may be set to have the same frequency hop position as in the legacy NR system in the non-SBFD slot (slot n+4). On the other hand, the position of each frequency hop for PUSCH transmission in the SBFD slots (slots n+5 to n+7) may be set / determined to be located on the uplink sub-band transmission region that the UE can transmit.

[0231] In the first embodiment, one RB offset for frequency hopping is set for the terminal in the same way as in an existing legacy NR system. In the first embodiment, based on the RB offset, the frequency hop on which PUSCH transmission is performed is set / determined so as to be located on the uplink sub-band transmission region where the terminal can transmit in the SBFD slot / symbol, and to be located in the same way as in the legacy NR system in the non-SBFD slot / symbol. According to the first embodiment, when the terminal performs uplink SBFD operation, there is no need to further configure an RB offset for frequency hopping, and one RB offset for frequency hopping used in the existing legacy NR system can be reused.

[0232] Specifically, the terminal can determine the first PRB set of the first hop using DCI that schedules PUSCH, or DCI / RRC signals that activate CG-PUSCH. Here, DCI that schedules PUSCH, or DCI / RRC signals that activate CG-PUSCH may include an FDRA field. The FDRA field may include (i) the index of the RB where the first PRB set of the first hop starts, and (ii) information regarding the number of consecutive RBs. Here, if the index of the RB where the first PRB set of the first hop starts is 0, the RB represents the lowest PRB of the terminal's active UL BWP. That is, the index of the RB where the first PRB set of the first hop starts may be analyzed as the index of the terminal's active UL BWP. Thereafter, the terminal must determine the index of the RB where the second PRB set of the second hop starts. This can be determined by the following formula.

Equation

[0233] Here, - M represents a value obtained based on (RB start (0)+RB offset ). For example, M is (RB start (0)+RBoffset -RB start,UL includes - RB start (0) represents the index of the RB where the first PRB set of the first hop starts, and RB start (1) represents the index of the RB where the second PRB set of the second hop starts. - RB offset represents the PRB interval between the first PRB set of the first hop and the second PRB set of the second hop. The base station can set / indicate RB offset to the terminal. - RB start,UL is the RB index of the lowest PRB available for uplink transmission in the slot or symbol for transmitting PUSCH. RB start,UL may have different values in SBFD slots / symbols and non - SBFD slots / symbols. For example, referring to Fig. 22(b), RB start,UL in slot n + 4 and RB start,UL in slots n + 5 to n + 7 may have different values. For example, in SBFD slots / symbols, RB start,UL is the starting PRB index of the uplink sub - band on the (active UL) BWP (e.g., any value from 0, 1, …, N size BWP - 1; preferably, a positive number), and in non - SBFD slots / symbols, RB start,UL may be 0. - N size UL is the number of PRBs available for uplink transmission in the slot / symbol among the PRBs of the active UL BWP. The PRBs available for uplink transmission may include PRBs that are not downlink PRBs. That is, the PRBs available for uplink transmission may include uplink or flexible PRBs. In SBFD slots / symbols, N size UL may include the PRBs included in the terminal's active UL BWP among the PRBs in the uplink sub - band. In non - SBFD slots / symbols, N size UL = Nsize BWP may be.

[0234] According to the above first embodiment, the second PRB set of the second hop determined by the SBFD slot or symbol and the non-SBFD slot or symbol may include different PRBs from each other. Referring to FIG. 21, the second PRB set of the second hop determined by the terminal in slot n+2 and the second PRB set of the second hop determined by the terminal in slot n+4 may include different PRBs from each other. Referring to FIG. 22, the second PRB set of the second hop determined by terminal #1 in slot n+2 and the second PRB set of the second hop determined by terminal #1 in slot n+4 may include different PRBs from each other.

[0235] Second Embodiment: In the second embodiment, in the same manner as in the existing legacy NR system, a first RB offset for frequency hopping can be used by the terminal to set the position of the frequency hop for the non-SBFD slot / symbol in the same manner as in the legacy NR system. On the other hand, for the SBFD slot / symbol, a second RB offset for the SBFD operation can be set so that each frequency hop in which PUSCH transmission is performed is located on the uplink subband transmission region that the terminal can transmit. According to the second embodiment, when the terminal and the base station perform the uplink SBFD operation, it is necessary to further configure the terminal with the second RB offset for the frequency hopping for the SBFD operation.

[0236] The terminal can determine the first PRB set of the first hop using DCI that schedules PUSCH or DCI / RRC signals that activate CG-PUSCH. Here, the DCI that schedules PUSCH or the DCI / RRC signals that activate CG-PUSCH may include an FDRA field. The FDRA field may include (i) the index of the RB where the first PRB set of the first hop starts and (ii) the number of consecutive RBs. Here, if the index of the RB where the first PRB set of the first hop starts is 0, the RB represents the lowest PRB of the terminal's active UL BWP. That is, the index of the RB where the first PRB set of the first hop starts may be analyzed as the index of the terminal's active UL BWP. Thereafter, the terminal must determine the index of the RB where the second PRB set of the second hop starts. For this purpose, depending on whether the slot / symbol for transmitting PUSCH by frequency hopping is the slot / symbol set or indicated as an uplink subband, the first RB offset or the second RB offset can be applied to determine the index of the RB where the second PRB set of the second hop starts.

[0237] Specifically, for non-SBFD slots / symbols, the first RB offset (i.e., RB offset ) can be applied as in the following formula to set the same frequency hopping position as in the legacy NR system.

Equation

[0238] On the other hand, for the SBFD slot / symbol, a second RB offset (e.g., RB offset,SB ) is applied as in the following formula so that each frequency hop where PUSCH transmission is performed in the SBFD slot / symbol can be located within the uplink subband transmission region.

Number

[0239] Third Embodiment: In the third embodiment, similar to the existing legacy NR system, in non-SBFD slots / symbols, the frequency hopping position is set in the same way as in the legacy NR system using the first RB offset for frequency hopping at the terminal, and in SBFD slots / symbols, the second RB offset for the SBFD operation is set so that the frequency hopping position is located on the uplink subband transmission region. According to the third embodiment, when the terminal and the base station perform the uplink SBFD operation, it is necessary to further configure the terminal with the second RB offset for frequency hopping for the SBFD operation.

[0240] Specifically, the terminal can determine the first PRB set of the first hop using the DCI that schedules the PUSCH or the DCI / RRC signal that activates the CG-PUSCH. Here, the DCI that schedules the PUSCH or the DCI / RRC signal that activates the CG-PUSCH may include an FDRA field. The FDRA field may include (i) the index of the RB where the first PRB set of the first hop starts and (ii) the number of consecutive RBs. Here, if the index of the RB where the first PRB set of the first hop starts is 0, the RB represents the lowest PRB of the terminal's active UL BWP. That is, the index of the RB where the first PRB set of the first hop starts may be analyzed as the index of the terminal's active UL BWP. Thereafter, the terminal must determine the index of the RB where the second PRB set of the second hop starts.

[0241] At this time, the position of the frequency hop may be determined to be different depending on whether the slot / symbol for transmitting the PUSCH by frequency hopping is the slot / symbol set or indicated as the uplink sub-band. For example, depending on whether the slot / symbol for transmitting the PUSCH by frequency hopping is the slot / symbol set or indicated as the uplink sub-band, the first RB offset (Equation 9) is applied, or the second RB offset (Equation 10) is applied, and the index of the RB where the second PRB set of the second hop starts can be determined.

[0242] Specifically, in the non-SBFD interval slot / symbol, the first RB offset (i.e., RB offset ) can be applied as in the following equation to set the position of the frequency hop identically to that in the legacy NR system.

Number

[0243] For the SBFD slot / symbol, the second RB offset (i.e., RB offset,SB ) is applied as follows so that the position of each frequency hop where PUSCH transmission is performed in the SBFD slot / symbol can be located within the uplink sub-band transmission region where the terminal can transmit.

Number

[0244] The first to third embodiments may also be applied to Msg3 PUSCH. The terminal may be set or instructed to transmit PUSCH by frequency hopping in the SBFD slot / symbol during the cell initial connection process. In this case, the first hop and the second hop in the frequency domain can be determined by the method described above. Here, since the terminal is before RRC connection, the uplink subband may be set or instructed according to the information received before Msg3 PUSCH transmission. For example, the uplink subband information is included in SIB1, and the terminal may set or instruct the uplink subband by receiving SIB1.

[0245] When applying the above first to third embodiments to Msg3 PUSCH, the PRB interval between the PRB set of the first hop and the PRB set of the second hop, that is, RB offset can be determined by applying the method for obtaining the RB of Msg3 PUSCH described above (see Table 7). offset Or, the RB of Msg3 PUSCH

[0246] offset may be determined differently from the method described above. For example, if the number of PRBs available for uplink transmission in the PRBs of the initial UL BWP in the slot / symbol (i.e., N size UL offset ) is less than 50 RB, RB offset is

Number

Number

[0247]

Table 8

[0248] 2) PUCCH

[0249] When the terminal is configured or instructed to transmit PUCCH by frequency hopping in the SBFD slot / symbol, it can be considered to determine the first hop and the second hop in the frequency domain by the method used in the legacy NR system. That is, the PUCCH resources configured by the base station for the terminal to determine the first hop or the second hop may be applied identically not only to the SBFD slot / symbol but also to other slots / symbols. In this case, the PRBs of the first hop and the second hop configured for the terminal in the PUCCH resources may include PRBs outside the uplink subband. When the PRB is a downlink PRB, the terminal cannot transmit PUCCH in that hop.

[0250] Hereinafter, a PUCCH frequency hopping method for solving the above-mentioned problems will be described. For convenience, the PRB index used to determine the PRBs of the first hop is called the first hopping PRB index, and the PRB index used to determine the PRBs of the second hop is called the second hopping PRB index.

[0251] First Embodiment: The terminal can further set an additional second hopping PRB index for frequency hopping (hereinafter, the second - 2 hopping PRB index) in the PUCCH resource configuration for SBFD operation separately from the existing second hopping PRB index (hereinafter, the second - 1 hopping PRB index) within the PUCCH resource configuration configured in the existing legacy NR system by RRC. That is, when frequency hopping is set for the SBFD slot / symbol, the terminal may further configure the second - 2 hopping PRB index for SBFD operation so that the position of the frequency hop where PUCCH transmission is performed is located on the uplink sub - band transmission region. The terminal may be instructed by DCI to select one of the PUCCH resources from the base station. In this case, the terminal can determine the position of each frequency hop where PUCCH transmission is performed based on the hopping PRB index within the PUCCH resource. At this time, if the slot / symbol where the frequency hop is located is an SBFD slot / symbol, the terminal can transmit PUCCH by applying the second - 2 hopping PRB index further configured for frequency hopping in the PUCCH resource configuration. On the other hand, if the slot / symbol where the frequency hop is located is a non - SBFD slot / symbol, the terminal can transmit PUCCH by applying the second - 1 hopping PRB index. According to the first embodiment, in the non - SBFD slot / symbol, the position of the frequency hop can be set in the same way as in the legacy NR system using the second - 1 hopping PRB index, and in the SBFD slot / symbol, the frequency hop may be located on the uplink sub - band transmission region using the second - 2 hopping PRB index for SBFD operation.

[0252] As described above, the terminal may configure a PRB set of a second hop for the SBFD slot / symbol from the base station. Since the base station instructs the terminal to use DCI to indicate one of the configured PUCCH resources, the terminal may be instructed to transmit the first PUCCH transmission at least on the first hop using the PRBs included in the uplink subband. Therefore, the terminal may separately configure only the PRB set for the second hop of the PUCCH transmitted in the uplink subband from the base station. That is, for the same PUCCH resource configuration, the second hop information may be configured with different values for the SBFD slot / symbol and the non-SBFD slot / symbol. For example, referring to FIG. 23, the terminal may configure, from the base station via RRC, a PUCCH resource having a PUCCH resource index (pucch-ResourceId) of 0 by PUCCH-Resource. At this time, the terminal may configure secondHopPRB = 20 as the second-hop hopping PRB index, and secondHopPRB-r18 for SBFD = 10 as the second-hop hopping PRB index. At this time, when the second-hop transmission is performed in the SBFD slot / symbol, the terminal may apply the second-hop hopping PRB index, that is, secondHopPRB-r18 for SBFD = 10, among the configurations of the PUCCH resource to determine the frequency position (for example, the PRB set) of the second hop and transmit the PUCCH. On the other hand, when the second-hop transmission is performed in the non-SBFD slot / symbol, the terminal may determine the frequency position of the second hop using the second-hop hopping PRB index, that is, secondHopPRB = 20, in the same manner as in the existing legacy NR system and transmit the PUCCH.

[0253] According to the above-described first embodiment, flexible frequency hopping is possible at least for SBFD slots / symbols. However, since the PUCCH resources are information configured for the terminal by the RRC signal, applying the same PUCCH resources identically to SBFD slots / symbols and non-SBFD slots / symbols may limit the flexible PUCCH resource configuration. Examples for a flexible PUCCH resource configuration are disclosed below.

[0254] Second Embodiment: For the configuration of PUCCH resources for SBFD operation, the terminal may be configured by the base station via RRC with a second PUCCH resource separately from the first PUCCH resource configuration configured in the existing legacy NR system by the RRC. For example, when the PUCCH is transmitted using frequency hopping in SBFD slots / symbols, the second PUCCH resource for SBFD operation may be configured such that the position of each frequency hop where the PUCCH transmission is performed is located in the uplink sub-band transmission region. The terminal may be instructed by the DCI to select one of the second PUCCH resources from the base station and perform transmission using the selected PUCCH resource. On the other hand, in the case of non-SBFD slots / symbols, the terminal may be instructed by the DCI to select one of the first PUCCH resources in the same manner as in the legacy NR system and perform transmission using the selected PUCCH resource.

[0255] As described above, the terminal may configure a different second PUCCH resource for the SBFD slot / symbol. That is, the terminal may configure a separate second PUCCH resource for the SBFD slot / symbol in order to receive a flexible PUCCH resource configuration from the base station. The second PUCCH resource may be configured by a different RRC signal from the PUCCH resource configured for non-SBFD slots / symbols. For example, referring to FIG. 24, when the terminal is configured by the base station with a PUCCH resource for SBFD operation by RRC, separately from the first PUCCH resource configured by PUCCH-Resource in the legacy NR system, the second PUCCH resource may be configured by the base station with PUCCH-Resource-r18 for SBFD by RRC. Therefore, even for PUCCH resources configured by the same PUCCH resource index, the information configured in the PUCCH resource may be different between the first PUCCH resource and the second PUCCH resource.

[0256] When the terminal configures a different second PUCCH resource from the base station according to the second embodiment, the terminal determines which of the first PUCCH resource and the second PUCCH resource to apply to a single PUCCH resource indicated by DCI (e.g., PRI in DCI) according to whether the slot / symbol indicated to transmit PUCCH by DCI format 1_0, 1_1, or 1_2 is an SBFD slot / symbol.

[0257] Table 9 shows an example according to the second embodiment above.

[0258]

Table 9

[0259] Also, the problem to be solved by the present invention relates to a method for determining a PRB set of hop 0 (hereinafter, PBR set #0) and a PRB set of hop 1 (hereinafter, PBR set #1) when a terminal transmits PUCCH by frequency hopping before RRC connection in an SBFD slot / symbol during the cell initial connection process.

[0260] More specifically, it relates to a method for allocating different hops within an uplink subband, that is, a PRB set of hop 0 and a PRB set of hop 1, when transmitting PUCCH by frequency hopping before RRC connection in an SBFD slot / symbol.

[0261] When a terminal transmits PUCCH before RRC connection, it selects / determines one PUCCH resource out of 16 PUCCH resources based on the PRI included in the DCI format for scheduling PUCCH as described above and the index of the CCE on which the DCI format was received.

[0262] For example, referring to FIG. 25, the terminal can determine the PUCCH resource index to be 6 based on the PRI and the CCE index (i.e., RB offsetBWP = 4, r PUCCH = 6, N CS = 4). Also, the terminal may be set or instructed such that N size BWP = 30 and N size UL = 10. That is, the terminal may be set or instructed to set the number of PRBs of the initial UL BWP to 30 (PRB#0 to 29), and the number of PRBs available for uplink transmission in the relevant slot / symbol among the PRBs of the initial UL BWP to 10 (PRB#8 to 17). At this time, when the terminal determines the frequency hop by the aforementioned existing method, the PRB index of hop 0 is

Number

Number

[0263] Hereinafter, embodiments for solving the above problems are disclosed.

[0264] First Embodiment: The terminal determines that the PRB index of hop 0 is

Number

Number

[0265] Specifically, if r PUCCH is one of the values of 0, 1, …, 7, the PRB index of hop 0 of the PUCCH resource is

Number

Number

Number

Number

[0266] For example, referring to FIG. 26, the terminal can determine the PUCCH resource index as 6 based on the PRI and the CCE index (i.e., RB offsetBWP = 4, r PUCCH = 6, N CS = 4). Also, the terminal may be set or instructed such that N size BWP = 30, N size UL = 10. According to the first embodiment, the PRB index of hop 0 is

Number

Number

[0267] Referring to FIG. 28, at the time of initial cell connection, the terminal may be set or instructed with a small number of uplink subbands of PRBs (N size BWP = 20, N size UL = 5). At this time, when determining the PRBs for frequency hopping based on the PRB offset in Table 6 (i.e., RB offsetBWP ), the PRB index may fall outside the PRBs available for uplink transmission. In FIG. 28, when determining the PRBs for frequency hopping according to the first embodiment, the PRB index of hop 0 is

Number

Number

[0268] Second Embodiment: The terminal, the PRB index of hop 0 is

Number

Number

[0269] Specifically, if r PUCCH is one of the values 0, 1,..., 7, the PRB index of hop 0 of the PUCCH resource is

Number

Number

Number

Number

[0270] For example, referring to FIG. 28, the terminal can determine the PUCCH resource index as 6 based on the PRI and CCE index (i.e., RB offsetBWP = 4, r PUCCH = 6, N CS = 4). Also, the terminal may be set or instructed with N size BWP = 20, N size UL = 5. According to the second embodiment, the terminal determines that the PRB index of hop 0 is

Number

Number

[0271] When the terminal determines the PRB set for frequency hopping according to the above first or second embodiment, at index = 15 in Table 6, RB size BWP may be replaced by RB size UL .

[0272] Third embodiment: The terminal determines that the PRB index of hop 0 is

Number

Number

[0273] Specifically, if r PUCCH is one of the values 0, 1, …, 7, the PRB index of hop 0 of the PUCCH resource is

Number

Number

Number

Number

[0274] According to the third embodiment, the terminal can separately determine an offset for frequency hopping in the slot / symbol in which the uplink is configured or instructed. The offset may be determined based on information separately received from the base station. Or, it may be information included in another table for the terminal to determine the PUCCH resource before RRC connection. That is, the terminal can analyze r PUCCH as an index applied to a new table instead of Table 6.

[0275] FIG. 29 illustrates a signal transmission method according to an example of the present invention. FIG. 29 corresponds to the first embodiment of the PUSCH case. The operations in FIG. 29 may be applied identically / similarly to other embodiments of the PUSCH case.

[0276] Referring to FIG. 29, the terminal receives control information for transmitting PUSCH, and the control information may include FDRA information (S2902). Thereafter, the terminal can transmit the PUSCH in a first RB set corresponding to a first hop within the UL BWP (S2904). Here, the first RB set may be determined based on the FDRA information. Also, the terminal can transmit the PUSCH in a second RB set corresponding to a second hop within the UL BWP (S2906). Here, when the second hop belongs to the SBFD symbol set in the time domain, the second RB set may be determined based on a value satisfying the following Mathematical Formula 1: Mathematical Formula 1: M mod N size UL + RB start,UL , where - M represents a value obtained based on (RB start + RB offset ), RB start represents the start RB index of the first RB set, RB offset represents an offset having one value among 0 to N size BWP -1, N size BWP represents the number of RBs of the UL BWP, - N size UL represents the number of RBs of the UL sub-band within the SBFD symbol set, - RB start,UL represents the index of the RB having the lowest index among the RBs of the UL sub-band within the UL BWP in the SBFD symbol set.

[0277] Here, when the second hop belongs to the non-SBFD symbol set in the time domain, the second RB set may be determined based on a value satisfying the following Mathematical Formula 2: Mathematical formula 2: (RB start + RB offset ) mod N size BWP Here, M may include (RB start + RB offset - RB start,UL ).

[0278] Here, the SBFD symbol set includes a DL sub-band FDM'd in the frequency domain and the UL sub-band, and the RB having the lowest index in the UL sub-band may be located within the UL BWP.

[0279] Here, the first RB set may be identically determined based on the FDRA information regardless of whether the first hop belongs to the SBFD symbol set or the non-SBFD symbol set in the time domain.

[0280] Although the method and system of the present invention have been described in connection with specific embodiments, some or all of their components or operations may be implemented by a computing system having a general-purpose hardware architecture.

[0281] The foregoing description of the present invention is for illustrative purposes, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily transformed into other specific forms without changing the technical idea or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented distributively, and similarly, components described as being distributed may also be implemented in a combined form.

[0282] The scope of the present invention is indicated by the appended claims rather than the above detailed description, and any changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention.

[0283] The scope of the present invention is indicated by the appended claims rather than the above detailed description, and any changes or modifications derived from the meaning and scope of the claims and their equivalent concepts shall be construed as being included within the scope of the present invention.

Description of Reference Numerals

[0284] UE terminal BS base station

Claims

1. A terminal in a wireless communication system, comprising: a communication module; and a processor for controlling the communication module, wherein the processor: receives control information for transmitting a PUSCH (physical uplink shared channel), the control information including FDRA (frequency domain resource assignment) information; transmits the PUSCH with a first set of RBs (resource blocks) corresponding to a first hop within a UL (uplink) BWP (bandwidth part), the first set of RBs being determined based on the FDRA information; transmits the PUSCH with a second set of RBs corresponding to a second hop within the UL BWP, and when the second hop belongs to a subband non-overlapping full duplex (SBFD) symbol set in the time domain, the second set of RBs is determined based on a value satisfying the following Mathematical Formula 1; Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ + RB ｓｔａｒｔ，ＵＬ , where - M represents a value obtained based on (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ), RB ｓｔａｒｔ represents the starting RB index of the first RB set, and RB ｏｆｆｓｅｔ represents an offset having one value among 0 to N ｓｉｚｅ ＢＷＰ - 1, and N ｓｉｚｅ ＢＷＰ represents the number of RBs of the UL BWP. -N ｓｉｚｅ ＵＬ represents the number of RBs of the UL sub-band within the SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ is a terminal that represents the index of the RB with the lowest index among the RBs of the UL subband within the UL BWP in the SBFD symbol set.

2. When the second hop belongs to a non-SBFD symbol set in the time domain, the second set of RBs is determined based on a value satisfying the following Mathematical Formula 2. Mathematical formula 2: (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The terminal according to claim 1.

3. M is the terminal according to claim 1, comprising (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ - RB ｓｔａｒｔ，ＵＬ ).

4. The SBFD symbol set includes a DL subband frequency division multiplexed (FDM) in the frequency domain and the UL subband, and the RB having the lowest index in the UL subband is located within the UL BWP. The terminal according to claim 1.

5. The first set of RBs is determined identically based on the FDRA information regardless of whether the first hop belongs to the SBFD symbol set or the non-SBFD symbol set in the time domain. The terminal according to claim 1.

6. A method used by a terminal in a wireless communication system, the method comprising: receiving control information for transmitting a PUSCH (physical uplink shared channel), the control information including FDRA (frequency domain resource assignment) information; Transmitting the PUSCH with a first set of resource blocks (RBs) corresponding to a first hop within a UL (uplink) BWP (bandwidth part), wherein the first set of RBs is determined based on the FDRA information; Transmitting the PUSCH with a second set of RBs corresponding to a second hop within the UL BWP, and when the second hop belongs to a subband non-overlapping full duplex (SBFD) symbol set in the time domain, the second set of RBs is determined based on a value satisfying the following Mathematical Formula 1; Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ + RB ｓｔａｒｔ，ＵＬ , where - M represents a value obtained based on (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ), RB ｓｔａｒｔ represents the starting RB index of the first RB set, RB ｏｆｆｓｅｔ represents an offset having one value among 0 to N ｓｉｚｅ ＢＷＰ - 1, and N ｓｉｚｅ ＢＷＰ represents the number of RBs of the UL BWP. -N ｓｉｚｅ ＵＬ represents the number of RBs in the UL sub-band within the SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ represents the index of the RB having the lowest index among the RBs of the UL subband in the UL BWP in the SBFD symbol set, a method. **Claim 7** When the second hop belongs to a non-SBFD symbol set in the time domain, the second set of RBs is determined based on a value satisfying the following Mathematical Formula 2; Mathematical formula 2: (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The method according to claim 6, wherein... **Claim 8** M is the method according to claim 6, comprising (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ - RB ｓｔａｒｔ，ＵＬ ). **Claim 9** The method according to claim 6, wherein the SBFD symbol set includes a DL subband frequency division multiplexed in the frequency domain and the UL subband, and the RB having the lowest index in the UL subband is located within the UL BWP. **Claim 10** The method according to claim 6, wherein the first set of RBs is identically determined based on the FDRA information regardless of whether the first hop belongs to the SBFD symbol set or the non-SBFD symbol set in the time domain. **Claim 11** A base station in a wireless communication system, comprising: A communication module; A processor for controlling the communication module, wherein the processor: Transmits control information received for a PUSCH (physical uplink shared channel), and the control information includes FDRA (frequency domain resource assignment) information; Receives the PUSCH with a first set of resource blocks (RBs) corresponding to a first hop within a UL (uplink) BWP (bandwidth part), and the first set of RBs is determined based on the FDRA information; Receive the PUSCH in a second RB set corresponding to a second hop within the UL BWP, where when the second hop belongs to a subband non-overlapping full duplex (SBFD) symbol set in the time domain, the second RB set is determined based on a value satisfying the following Mathematical Expression 1: Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ + RB ｓｔａｒｔ，ＵＬ , where - M represents a value obtained based on (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ), where RB ｓｔａｒｔ represents the starting RB index of the first RB set, and RB ｏｆｆｓｅｔ represents an offset having one value among 0 to N ｓｉｚｅ ＢＷＰ - 1, and N ｓｉｚｅ ＢＷＰ represents the number of RBs of the UL BWP. -N ｓｉｚｅ ＵＬ represents the number of RBs of the UL sub-band within the SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ represents the index of the RB having the lowest index among the RBs of the UL subband within the UL BWP in the SBFD symbol set, at the base station.

12. When the second hop belongs to a non-SBFD symbol set in the time domain, the second RB set is determined based on a value satisfying the following Mathematical Expression 2: Mathematical formula 2: (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The base station according to claim 11, wherein...

13. M is the base station according to claim 11, including (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ - RB ｓｔａｒｔ，ＵＬ ).

14. The SBFD symbol set includes a frequency division multiplexed (FDM) DL subband and the UL subband in the frequency domain, and the RB having the lowest index in the UL subband is located within the UL BWP. The base station according to claim 11.

15. The first RB set is determined identically based on the FDRA information regardless of whether the first hop belongs to the SBFD symbol set or the non-SBFD symbol set in the time domain. The base station according to claim 11.

16. A method used by a base station in a wireless communication system, comprising: Transmitting control information for receiving a physical uplink shared channel (PUSCH), where the control information includes frequency domain resource assignment (FDRA) information; Receiving the PUSCH in a first RB set corresponding to a first hop within a UL (uplink) BWP (bandwidth part), where the first RB set is determined based on the FDRA information; Receiving the PUSCH in a second RB set corresponding to a second hop within the UL BWP, and when the second hop belongs to a subband non-overlapping full duplex (SBFD) symbol set in the time domain, the second RB set is determined based on a value satisfying the following Mathematical Expression 1: Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ + RB ｓｔａｒｔ，ＵＬ , where - M represents a value obtained based on (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ), RB ｓｔａｒｔ represents the starting RB index of the first RB set, RB ｏｆｆｓｅｔ represents an offset having one value among 0 to N ｓｉｚｅ ＢＷＰ - 1, and N ｓｉｚｅ ＢＷＰ represents the number of RBs of the UL BWP. -N ｓｉｚｅ ＵＬ represents the number of RBs of the UL sub-band in the SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ is a method that represents the index of the RB with the lowest index among the RBs of the UL subbands within the UL BWP in the SBFD symbol set.

17. When the second hop belongs to a non-SBFD symbol set in the time domain, the second RB set is determined based on a value satisfying the following mathematical formula 2, Mathematical formula 2: (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The method according to claim 16, which is as described above.

18. M is the method according to claim 16, comprising (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ - RB ｓｔａｒｔ，ＵＬ ).

19. The method according to claim 16, wherein the SBFD symbol set includes a frequency division multiplexed (FDM) DL sub-band and the UL sub-band in the frequency domain, and the RB having the lowest index in the UL sub-band is located within the UL BWP.

20. The method according to claim 16, wherein the first RB set is determined identically based on the FDRA information regardless of whether the first hop belongs to the SBFD symbol set or the non-SBFD symbol set in the time domain.

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