Method and apparatus for transmitting signals 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] This invention relates to wireless communication systems. More specifically, this invention relates to a method for transmitting signals in a wireless communication system and an apparatus using the same. [Background technology]

[0002] Following the commercialization of fourth-generation (4G) communication systems, efforts are underway to develop a new fifth-generation (5G) communication system to meet the growing demand for wireless data traffic. 5G communication systems are also referred to as post-LTE systems or new radio (NR) systems, or the next generation of network communication systems beyond 4G. To achieve high data transfer rates, 5G communication systems include systems operating using millimeter-wave (mmWave) bands above 6 GHz, as well as systems operating using frequency bands below 6 GHz to ensure coverage. Consequently, implementation forms at base stations and terminals are still under consideration.

[0003] This increases efficiency and enables communication providers to deliver more data and voice services over a given bandwidth. Therefore, 3GPP® NR systems are designed to meet the demand for high-speed data and media transmission, in addition to supporting large volumes of voice. The advantages of NR systems include higher throughput and lower latency on the same platform, support for frequency division duplexing (FDD) and time division duplexing (TDD), and lower operating costs with an extended end-user environment and a simpler architecture.

[0004] For more efficient data processing, the dynamic TDD of an NR system may use a method to vary 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 user. For example, when the downlink traffic of a cell is greater than the uplink traffic, the base station may allocate more downlink OFDM symbols to slots (or subframes). Information about the slot configuration should be transmitted to the terminal.

[0005] To mitigate path loss in the ultra-high frequency band and increase the transmission distance of radio waves, beamforming, massive multi-input multi-output (MIMO), full-dimensional multi-input multi-output (FD-MIMO), array antennas, analog beamforming, hybrid beamforming (combining analog and digital beamforming), and large-scale antenna technologies are being discussed for 5G communication systems. Furthermore, in order to improve the system network, 5G communication systems are undergoing technological development related to advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving networks, cooperative communication, CoMP (coordinated multi-points), and interference cancellation.In addition, 5G systems have seen the development of advanced coding modulation (ACM) methods such as FQAM (hybrid FSK and QAM modulation) and SWSC (sliding window superposition coding), as well as advanced access technologies such as FBMC (filter bank multi-carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access).

[0006] On the other hand, in a human-centered connected network where humans generate and consume information, the internet is evolving into the Internet of Things (IoT) network, where information is exchanged between distributed components such as objects. The Internet of Everything (IoE) technology is also emerging, combining IoT technology with big data processing technology through connectivity to cloud servers. Implementing IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. As a result, in recent years, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have been explored for object-to-object connectivity. In an IoT environment, intelligent internet technology (IT) services can be provided that collect and analyze data generated from connected objects to create new value in human life. Through the integration and blending 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, healthcare, smart home appliances, and advanced medical services.

[0007] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) are implemented using techniques such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology described above is an example of the convergence of 5G technology and IoT technology. In general, mobile communication systems are developed to provide voice services while ensuring user activity.

[0008] However, mobile communication systems are gradually expanding beyond voice to include data services, and have now developed to the point where they can provide high-speed data services. However, due to resource shortages in currently available mobile communication systems and the demand for high-speed services from users, more advanced mobile communication systems are needed. [Overview of the project] [Problems that the invention aims to solve]

[0009] The 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, the object of the present invention is to provide a frequency hopping method for efficiently transmitting signals in a wireless communication system and an apparatus using the same. [Means for solving the problem]

[0010] As one aspect of the present invention, a terminal in a wireless communication system includes a communication module and a processor that controls the communication module. The processor receives control information for transmitting a PUSCH (physical uplink shared channel), and the control information includes FDRA (frequency domain resource assignment) information. The PUSCH is transmitted in a first RB (resource block) set corresponding to a first hop within a UL (uplink) BWP (bandwidth part), and the first RB set is determined based on the FDRA information. The PUSCH is transmitted in a second RB set corresponding to a second hop within the UL BWP. 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 that satisfies 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 subband 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 subband within the UL BWP in the SBFD symbol set.

[0011] In another aspect of the present invention, a method is provided for use by a terminal in a wireless communication system, comprising the steps of: receiving control information for transmitting a PUSCH (physical uplink shared channel), wherein the control information includes frequency domain resource assignment (FDRA) information; transmitting the PUSCH in a first resource block (RB) set corresponding to a first hop in an uplink bandwidth part (UL) BWP, wherein the first RB set is determined based on the FDRA information; and transmitting the PUSCH in a second RB set corresponding to a second hop in the UL BWP, wherein, if 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 formula 1: Mathematical formula 1: M mod N size UL +RB start,UL , here M is (RB start +RB offset ) represents the value obtained based on RB start This represents the starting RB index of the first RB set, and RB offset is 0 to N size BWP Represents an offset that has one of the values ​​of -1, N size BWP This represents the number of RBs in the UL BWP, and N size UL This represents the number of RBs in the UL subband within the SBFD symbol set, and RB start,UL This 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.

[0012] In yet another aspect of the present invention, a base station in a wireless communication system is provided, comprising a communication module and a processor that controls the communication module, wherein the processor transmits receiving control information for a physical uplink shared channel (PUSCH), the control information comprising frequency domain resource assignment (FDRA) information, the PUSCH being received by a first resource block (RB) set corresponding to a first hop in an uplink bandwidth part (UL) BWP, the first RB set being determined based on the FDRA information, and the PUSCH being received by a second RB set corresponding to a second hop in the UL BWP, the second RB set being determined based on a value satisfying the following mathematical formula 1, where the second hop belongs to a subband non-overlapping full duplex (SBFD) symbol set in the time domain: Mathematical formula 1: M mod N size UL +RB start,UL , here M is (RB start +RB offset ) represents the value obtained based on RB start This represents the starting RB index of the first RB set, and RB offset is 0 to N size BWP Represents an offset that has one of the values ​​of -1, N size BWP This represents the number of RBs in the UL BWP, and N size UL This represents the number of RBs in the UL subband within the SBFD symbol set, and RB start,UL This 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.

[0013] In yet another aspect of the present invention, a method is provided for use by a base station in a wireless communication system, comprising the steps of: transmitting control information for receiving a physical uplink shared channel (PUSCH), wherein the control information includes frequency domain resource assignment (FDRA) information; receiving the PUSCH with a first resource block (RB) set corresponding to a first hop in an uplink bandwidth part (UL) BWP, wherein the first RB set is determined based on the FDRA information; and receiving the PUSCH with a second RB set corresponding to a second hop in the UL BWP, wherein, if 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 formula 1: Mathematical formula 1: M mod N size UL +RB start,UL , here M is (RB start +RB offset ) represents the value obtained based on RB start This represents the starting RB index of the first RB set, and RB offset is 0 to N size BWP Represents an offset that has one of the values ​​of -1, N size BWP This represents the number of RBs in the UL BWP, and N size UL This represents the number of RBs in the UL subband within the SBFD symbol set, and RB start,UL This 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.

[0014] Preferably, if 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 that satisfies the following mathematical formula 2: Mathematical formula 2: (RB start +RBoffset ) mod N size BWP

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

[0016] Preferably, the SBFD symbol set includes a DL subband and an UL subband that have been FDM (frequency division multiplexed) in the frequency domain, and the RB having the lowest index in the UL subband 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 a non-SBFD symbol set in the time domain. [Effects of the Invention]

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

[0019] The effects obtained from the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those with ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawing]

[0020] [Figure 1] This figure shows an example of a wireless frame structure used in a wireless communication system. [Figure 2] This figure shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3] This diagram illustrates the physical channels used in 3GPP systems and typical signal transmission methods that utilize these physical channels. [Figure 4a] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 4b] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5a] This diagram shows the procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 5b] This diagram shows the procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 6] This diagram shows the control resource set (CORESET) that can be transmitted within a physical downlink control channel (PDCCH) in a 3GPP NR system. [Figure 7] This figure shows a method for constructing the PDCCH search space in the 3GPP NR system. [Figure 8] This is a conceptual diagram illustrating carrier aggregation. [Figure 9] This diagram illustrates single-carrier and multi-carrier communication. [Figure 10] This figure shows an example of how cross-carrier scheduling techniques are applied. [Figure 11] This is a block diagram showing the configuration of a terminal and a base station according to one embodiment of the present invention. [Figure 12] This diagram shows how to configure subbands. [Figure 13] This diagram shows how to configure subbands. [Figure 14] This diagram shows how to configure subbands. [Figure 15] This diagram shows how to configure subbands. [Figure 16] This diagram shows how to configure subbands. [Figure 17] This diagram shows how to configure subbands. [Figure 18] This diagram shows how to configure subbands. [Figure 19] This diagram shows the problems that occur when frequency hopping in subbands and configured or specified resources. [Figure 20] This diagram shows the problems that occur when frequency hopping in subbands and configured or specified resources. [Figure 21] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 22] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 23] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 24] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 25] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 26] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 27] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 28] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Figure 29] This figure shows a frequency hopping method in a subband and a set or designated resource according to an example of the present invention. [Modes for carrying out the invention]

[0021] The terminology used herein adopts common terms that are currently widely used as possible by considering the function of the present invention, but these terms may be modified in accordance with the intent, practice, and emergence of new technologies of those skilled in the art. Furthermore, in certain cases, there are terms that are at the discretion of the applicant, in which case their meanings will be explained in the corresponding descriptive sections of the present invention. It is therefore intended to be clear that the terminology used herein should be analyzed not only on the basis of the names of the terms but also on the substantive meaning of the terms and 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 “electrically connected” to the other element through a third element. Furthermore, unless explicitly stated otherwise, the word “equips” shall be understood as implying the inclusion of the element being described, and not as implying the exclusion of any other element, unless otherwise specified. Moreover, limitations such as “greater than” or “less than” based on a particular threshold may be appropriately replaced in some exemplary embodiments with “greater than” or “less than,” respectively.

[0023] The following technologies can be used in various wireless access systems, including Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier FDMA (SC-FDMA). CDMA can be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by wireless technologies such as Global System for Mobile Communications (GSM®) / General-Purpose Packet Radio Service (GPRS) / GSM® Advanced High-Speed ​​Data Rate (EDGE). OFDMA can be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Advanced UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The Third Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is part of Advanced UMTS (EUMTS), which uses Advanced UMTS Terrestrial Radio Access (E-UTRA), and LTE Advanced (A) is an advanced version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A to support the requirements of IMT-2020: enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication (mMTC) services. For clarity, 3GPP NR will be described primarily, but the technical ideas of this invention are not limited to them.

[0024] Unless otherwise specified herein, a base station may refer to a next-generation node B (gNB) as defined in 3GPP NR. Furthermore, unless otherwise specified herein, a terminal may refer to a user equipment (UE). To aid in understanding the explanation below, each part will be described separately as an embodiment, but each embodiment may be used in combination with others. In this disclosure, terminal configuration may refer to configuration by the base station. Specifically, the base station may transmit channels or signals to the terminal and set the values ​​of parameters used in the operation of the terminal or in the wireless communication system.

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

[0026] Referring to Figure 1, the wireless frame (or radio frame) used in the 3GPP NR system has a length of 10 ms (Δf max N f / 100)*T c ) may be. In addition, a wireless frame includes 10 subframes (SF) 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. Ten subframes within a single wireless frame may each be assigned a number from 0 to 9. Each subframe has a length of 1 ms and may contain one or more slots according to the subcarrier interval. More specifically, in a 3GPP NR system, the subcarrier intervals that can be used are 15*2 μThe frequency is 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 is 2 μ It may contain 2 slots. In this case, the length of each slot is 2 -μ It is ms. 2 within one subframe μ Each slot has 0 to 2 μ Numbers up to -1 may be assigned. In addition, each slot within a single wireless frame can be assigned from 0 to 10*2. μ A number up to -1 may be assigned. Time resources can be distinguished by at least one of the following: wireless frame number (also called wireless frame index), subframe number (also called subframe index), and slot number (or slot index).

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

[0028] Specifically, Figure 2 shows the structure of the resource grid in a 3GPP NR system. There is one resource grid per antenna port. Referring to Figure 2, a slot contains multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol section. Unless otherwise specified, an OFDM symbol is sometimes simply called a symbol. One RB contains 12 consecutive subcarriers in the frequency domain. Referring to Figure 2, the signal transmitted from each slot is N size,μ grid,x *N RB sc Book subcarriers 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 an 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 sometimes 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 a specific embodiment, the extended CP may be used only at a 60 kHz subcarrier spacing. In FIG. 2, for the sake of explanation, one slot is configured using 14 OFDM symbols as an example, but the embodiments of the present disclosure can 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 subcarriers of this book. The types of subcarriers can be divided into data subcarriers for data transmission, reference signal subcarriers for reference signal transmission, and guard bands. The carrier frequency is also called the center frequency (fc).

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

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

[0032] Each symbol in a radio frame used in time-division duplexing (TDD), i.e., in an unpaired spectrum, may consist of at least one of DL symbols, UL symbols, and flexible symbols. A radio frame used as a DL carrier in frequency-division duplexing (FDD), i.e., in a paired spectrum, may consist of DL symbols or flexible symbols, and a radio frame used as a UL carrier may consist of UL symbols or flexible symbols. DL symbols allow for DL ​​transmission but not UL transmission. UL symbols allow for UL transmission but not DL transmission. Flexible symbols may be determined to be used as DL or UL depending on the signal.

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

[0034] When information about the symbol type is configured using UE-specific RRC signals, the base station can 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 a DL symbol or a 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 can be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot can 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 can synchronize with the BS during initial cell search. For this purpose, the UE can receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as the cell ID. Thereafter, the UE can receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0037] Upon completion of the initial cell discovery, the UE receives the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) according to the information in the PDCCH. As a result, the UE can obtain more specific system information than the system information obtained through the initial cell discovery (S102). Here, the system information obtained by the UE is the cell-common system information necessary for the UE to operate correctly at the physical layer in the Radio Resource Control (RRC), and is also called remaining system information or system information block (SIB) 1.

[0038] If the terminal first accesses the base station or if there are no radio resources for signal transmission (if the terminal is in RRC_IDLE mode), the terminal performs a random access process to the base station S103 to S106. First, the terminal transmits a preamble via the physical random access channel (PRACH) S103, and receives a random access response (RAR) message for the preamble from the base station via the PDCCH and corresponding PDSCH S104. If the terminal receives a valid random access response, the terminal transmits data including its identifier 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 PDSCH S105. Next, the terminal waits to receive the PDCCH as instructed by the base station to resolve collisions. If the terminal successfully receives the PDCCH via its identifier and receives the corresponding PDSCH S106, the random access process ends. During the random access process, the terminal acquires the terminal-specific system necessary for the terminal to function correctly at the physical layer in the RRC layer. Once a terminal obtains terminal-specific system information from the RRC hierarchy, the terminal enters RRC_CONNECTED mode.

[0039] The RRC layer is used for message generation and management for control between terminals and the Radio Access Network (RAN). More specifically, base stations and terminals can manage the transmission of broadcast and paging messages of cell system information required by all terminals in a cell, as well as mobility management and handover, terminal measurement reporting and control, terminal capability management, and equipment management, all within the RRC layer. Generally, the update of signals transmitted in the RRC layer (hereinafter referred to as RRC signals) is longer than the transmission time interval (i.e., TTI) in the physical layer, so RRC signals can be maintained unchanged over long periods.

[0040] After the procedure described above, the UE receives the PDCCH / PDSCH (S107) and transmits the 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. The format of the DCI may also vary depending on the intended use. The uplink control information (UCI) that the UE transmits 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 a 3GPP NR system, the UE may transmit control information such as the HARQ-ACK and CSI described above via PUSCH and / or PUCCH.

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

[0042] When power is turned on or when a new cell is desired, the UE may obtain time and frequency synchronization with the cell and execute an initial cell discovery procedure. During the cell discovery procedure, the UE obtains the physical cell identification information N of the cell. cell IDThis can be detected. To this end, the UE can receive synchronization signals from the base station, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and synchronize with the base station. In this case, the UE can obtain information such as cell identification information (ID).

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

[0044] [Table 1]

[0045] SS allows 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 three PSS and SSS combinations, such that each physical layer cell ID is part of only one physical layer cell identifier group. Thus, physical layer cell ID N cell ID =3N (1) ID +N (2) ID This represents an index N ranging from 0 to 335, indicating a physical layer cell identifier group. (1) ID , and an index N ranging from 0 to 2, indicating the physical layer identifier within the physical layer cell identifier group. (2) ID This can be uniquely defined by the following. 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 PSS sequence d PSS (n) is as follows:

number

number

number

[0046] Furthermore, the SSS series d SSS (n) 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. Referring to Figure 4b, the slot in which the SS / PBCH block is transmitted within each half-frame is described. 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 subcarrier spacing is 15 kHz, and the start of the SS / PBCH block is the ({2,8}+14*n)th symbol. In this case, n=0 or 1 at carrier frequencies below 3 GHz. In addition, n may be 0, 1, 2, or 3 at carrier frequencies above 3 GHz and below 6 GHz. In case B, the subcarrier spacing is 30 kHz, and the start of the SS / PBCH block is {4,8,16,20}+28*n. In this case, n=0 at carrier frequencies below 3 GHz. In addition, n may be 0 or 1 at carrier frequencies above 3 GHz and below 6 GHz. In Example C, the subcarrier spacing is 30 kHz, and the start of the SS / PBCH block is the ({2,8}+14*n)th symbol. In this case, n=0 or 1 at carrier frequencies below 3 GHz. In addition, n may be 0, 1, 2, or 3 at carrier frequencies above 3 GHz and below 6 GHz. In Example D, the subcarrier spacing is 120 kHz, and the start of the SS / PBCH block is the ({4,8,16,20}+28*n)th symbol. In this case, n is 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, or 18 at carrier frequencies above 6 GHz. In Example E, the subcarrier spacing is 240 kHz, and the start of the SS / PBCH block is the ({8,12,16,20,32,36,40,44}+56*n)th symbol. In this case, for carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0048] Figures 5a and 5b illustrate the procedures for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5a, a base station may add a cyclic redundancy check (CRC) masked (e.g., by XOR operation) using a radio network temporary identifier (RNTI) to the 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 piece of control information. A common RNTI used by one or more UEs may include at least one of the following: system information RNTI (SI-RNTI), paging RNTI (P-RNTI), random access RNTI (RA-RNTI), and transmit power control RNTI (TPC-RNTI). In addition, UE-specific RNTIs may include at least one of the following: cell temporary RNTI (C-RNTI) and CS-RNTI. Subsequently, the base station may perform channel coding (e.g., polar coding) (S204) and then perform rate matching according to the amount of resources used for PDCCH transmission (S206). The base station may then 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 the basic resource unit for a PDCCH, and one CCE may contain multiple (e.g., six) resource element groups (REGs). One REG may consist of multiple (e.g., twelve) REs. The number of CCEs used for one PDCCH may be defined as the aggregation level.In 3GPP NR systems, aggregation levels 1, 2, 4, 8, or 16 may be used. Figure 5b is a diagram relating CCE aggregation levels and PDCCH multiplexing, showing the type of CCE aggregation level used for a single PDCCH and the CCE transmitted within the control area accordingly.

[0049] Figure 6 shows the control resource set (core set) that a physical downlink control channel (PDCCH) can transmit within in a 3GPP NR system.

[0050] A coreset is a time-frequency resource in which PDCCHs, i.e., control signals for the UE, are transmitted. In addition, a search space, which will be described later, may be mapped to a coreset. Thus, a UE may monitor a time-frequency domain designated as a coreset, rather than monitoring all frequency bands for PDCCH reception, and can decode the PDCCH mapped to the coreset. A base station may configure one or more coresets per cell for the UE. A coreset may be configured using up to three consecutive symbols on the time axis. In addition, a coreset may be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of Figure 6, coreset #1 is configured using consecutive PRBs, and coresets #2 and #3 are configured using non-contiguous PRBs. A coreset may be placed in any symbol within a slot. For example, in the embodiment of Figure 6, coreset #1 starts at the first symbol of the slot, coreset #2 starts at the fifth symbol of the slot, and coreset #9 starts at the ninth symbol of the slot.

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

[0052] To transmit a PDCCH to a UE, each core set may have at least one search space. In embodiments of this disclosure, the search space is a set of all time-frequency resources through which a UE's PDCCH can be transmitted (hereinafter, PDCCH candidates). The search space may include a common search space that all UEs of 3GPP NR are required to search in common, and terminal-specific or UE-specific search spaces that a particular UE is required to search. In the common search space, a UE may monitor a PDCCH that is set up to be searched in common by all UEs in a cell belonging to the same base station. In addition, UE-specific search spaces may be set up per UE so that a UE monitors a PDCCH allocated to each UE at different search space locations according to the UE. In the case of UE-specific search spaces, the search spaces between UEs may partially overlap or be allocated due to the limited control area through which a PDCCH is allocated. Monitoring a PDCCH involves blind decoding to find PDCCH candidates in the search space. When blind decoding is successful, it may be expressed that the PDCCH has been (successfully) detected / received, and when blind decoding fails, it may be expressed that the PDCCH has not been detected / received, or has not been successfully detected / received.

[0053] For the sake of explanation, a PDCCH scrambled using a group-common (GC) RNTI previously known to one or more UEs to send DL control information to one or more UEs is called a group-common (GC) PDCCH or common PDCCH. In addition, a PDCCH scrambled using a terminal-specific RNTI already known to a particular UE to send UL scheduling information or DL ​​scheduling information to a particular UE is called a UE-specific PDCCH. Common PDCCHs may be contained within a common search space, and UE-specific PDCCHs may be contained within a common search space or within a UE-specific PDCCH.

[0054] A base station may signal to each UE or UE group via the PDCCH about information relating to resource allocation for the transmission channels, namely the paging channel (PCH) and the downlink-shared channel (DL-SCH) (i.e., DL permission), or information relating to resource allocation for the uplink-shared channel (UL-SCH) and Hybrid Automatic Retransmission Request (HARQ) (i.e., UL permission). The base station may transmit PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station may transmit data, excluding certain control information or certain service data, via the PDSCH. In addition, UEs may receive data, excluding certain control information or certain service data, via the PDSCH.

[0055] A base station may include information in a PDCCH about where the UE(s) PDSCH data will be transmitted to and how the corresponding UE will receive and decode the PDSCH data, and may transmit such a PDCCH. For example, suppose a DCI transmitted on a particular PDCCH is CRC masked using an RNTI named "A", and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., frequency location) named "B", and indicates transmission format information (e.g., transport block size, modulation scheme, coding information, etc.) named "C". A UE monitors the PDCCH using the RNTI information it possesses. In this case, if there is a UE performing blind decoding of the PDCCH using the RNTI of "A", that UE will receive the PDCCH and, through the received PDCCH information, receive the PDSCH indicated by "B" and "C".

[0056] Table 2 shows one embodiment of a 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-SCH resources. - HARQ-ACK: A response to the PDCCH (indicating DL SPS release) and / or to the DL transport block (TB) on the PDSCH. HARQ-ACK indicates whether information transmitted on the 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 conjunction with HARQ-ACK / NACK and ACK / NACK. Generally, ACK may be represented by a bit value of 1, and NACK may be represented by a bit value of 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. Multi-input multiple-output (MIMO) related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). The CSI can be divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0059] The 3GPP NR system may use five PUCCH formats to support various service scenarios, 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 through two OFDM symbols, the same sequence on the two symbols may be transmitted through different RBs. In this case, the sequence may be a sequence that has been cyclically shifted (CS) from the base sequence used in PUCCH format 0. Through this, the UE can obtain frequency diversity gain. Specifically, the terminal is M bit Bit UCI(M bit =1 or 2) The cyclic shift (CS) value m cs It is possible to determine this. Also, a basic series of length 12 can be determined by a defined CS value m cs Based on this, a cyclically shifted sequence can be mapped to 12 REs, each consisting of one OFDM symbol and one RB, and transmitted. The number of cyclic shifts available to the terminal is 12, and M bit If = 1, then the 1-bit UCI 0 and 1 can be mapped to two cyclically shifted sequences, respectively, where the difference in cyclic shift values ​​is 6. Also, M bit If = 2, the 2-bit UCIs 00, 01, 11, and 10 can each be mapped to four cyclically shifted sequences, each with a cyclic shift value difference of 3.

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

[0062] PUCCH format 2 can deliver UCIs of more than 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 through two OFDM symbols, the sequences transmitted through the two OFDM symbols in different RBs may be the same as each other. Here, the sequence is a plurality of modulated complex value symbols d(0),...,d(M symbol -1) is acceptable. Here, M symbol is M bit It may be / 2. Through this, the UE can obtain frequency diversity gain. More specifically, M bit Bit UCI(M bit >2) is bit-level scrambled, QPSK modulated, and mapped to one or two OFDM symbols, where the number of RBs can be one between 1 and 16.

[0063] PUCCH format 3 or PUCCH format 4 can deliver UCIs of more than 2 bits. PUCCH format 3 or PUCCH format 4 can be transmitted through a sequence of 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 uses π / 2-2 phase shift keying (BPSK) or QPSK for M bit Modulate the bit UCI (Mbit>2) to obtain the complex value symbol d(0)~d(M symb -1) is generated. Here, when using π / 2-BPSK, M symb =M bit And when using QPSK, M symb =M bit The value is / 2. The UE does not have to apply block-based spread to PUCCH format 3. However, the UE may apply block-based spread to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length 12 such that PUCCH format 4 may have a multiplexing capacity of 2 or 4. The UE performs transmit precoding (or DFT precoding) on ​​the spread signal and maps it to each RE to transmit the spread signal.

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

[0065] PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured through an RRC signal to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency-hopped may 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 may be configured to be transmitted repeatedly in multiple slots. In this case, the number K of slots in which the PUCCH is transmitted repeatedly may be determined by the RRC signal. The repeatedly transmitted PUCCH must begin at a fixed position OFDM symbol in each slot and must be of a constant length. When one of the OFDM symbols in a 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 in which it is to be transmitted.

[0067] On the other hand, in a 3GPP NR system, a terminal can transmit and receive using a bandwidth smaller than or equal to the carrier (or cell) bandwidth. To this end, a terminal may have a bandwidth part (BWP) consisting of a contiguous portion of the carrier bandwidth. A terminal operating by TDD or in an unpaired spectrum may have up to four DL / UL BWP pairs per carrier (or cell). A terminal can also activate one DL / UL BWP pair. A terminal operating by FDD or in a paired spectrum may have up to four DL BWPs per downlink carrier (or cell) and up to four UL BWPs per 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 on time-frequency resources other than the activated BWPs. Activated BWPs can be called active BWPs.

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

[0069] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0070] To achieve this, the UE uses multiple frequency blocks or cells (in a logical sense) composed of UL resources (or component carriers) and / or DL ​​resources (or component carriers) as one large logical frequency band. A single component carrier may also be referred to as a primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, for the sake of explanation, the term "component carrier" will be used below.

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

[0072] A different center frequency may be used for each component carrier. Alternatively, a single common center frequency may be used for physically adjacent component carriers. In the embodiment shown in Figure 8, assuming that all component carriers are physically adjacent, center frequency A may be used for all component carriers. Furthermore, assuming that the component carriers are not physically adjacent to each other, center frequencies A and B may be used for each component carrier.

[0073] When the entire system bandwidth is extended by carrier aggregation, the frequency bandwidth used for communication with each UE can be defined in units of component carriers. UE A may use the entire system bandwidth of 100 MHz and communicate using all five component carriers. UEs B1-B5 may use only 20 MHz bandwidth and communicate using one component carrier. UEs C1 and C2 may use 40 MHz bandwidth and communicate using two component carriers each. The embodiment in Figure 8 shows UE C1 using two non-adjacent component carriers and UE C2 using two adjacent component carriers.

[0074] Figure 9 illustrates single-carrier and multi-carrier communication. Specifically, Figure 9(a) shows a single-carrier subframe structure, and Figure 9(b) shows a multi-carrier subframe structure.

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

[0076] A base station may communicate with a UE by activating some or all of the UE's serving CCs, or by deactivating some of the CCs. The base station may change which CCs are to be activated / deactivated, and may change the number of CCs to be activated / deactivated. If the base station allocates CCs available to a UE as cell-specific or UE-specific, at least one of the allocated CCs may be deactivated unless the CC allocation to the UE is completely reconfigured or the UE is handed over. The CC that is not deactivated by the UE is called the Primary CC (PCC) or Primary Cell (PCell), and the CC that the base station can freely activate / deactivate is called the Secondary CC (SCC) or Secondary Cell (SCell).

[0077] On the other 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, i.e., a combination of DL CC and UL CC. A cell may consist of DL resources only, or a combination of DL resources and UL resources. When carrier aggregation is supported, the coordination between the carrier frequencies of DL resources (i.e., DL CC) and UL resources (i.e., UL CC) may be indicated by system information. The carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to an SCC is called a SCell. The carrier corresponding to a PCell in DL is a DL PCC, and the carrier corresponding to a PCell in UL is a UL PCC. Similarly, the carrier corresponding to a SCell in DL is a DL SCC, and the carrier corresponding to a SCell in UL is a UL SCC. Depending on the UE capability, a serving cell may consist of one PCell and zero or more SCells. If a UE is in the RRC_CONNECTED state but is not configured for or does not support carrier aggregation, it will have only one serving cell configured using only PCells.

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

[0079] Figure 10 shows an example where the cross-carrier scheduling technique is applied. When cross-carrier scheduling is set up, a control channel transmitted through the first CC can schedule a data channel transmitted through the first or second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is set up, and DL / UL permissions transmitted within the PDCCH area of ​​the scheduling cell schedule the PDSCH / PUSCH of the scheduled cell. That is, a search area for multiple component carriers exists within the PDCCH area of ​​the scheduling cell. A PCell can essentially be a scheduling cell, and a particular SCell may be designated as a scheduling cell by a higher layer.

[0080] In the embodiment shown in Figure 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carriers #1 and #2 are DL SCCs (or SCells). In addition, it is assumed that the DL PCC is configured as a PDCCH that monitors CCs. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) upper-layer signaling, CIF is disabled, and each DL CC can send only a PDCCH to schedule its PDSCH without using 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, CIF is enabled, and a particular CC (e.g., DL PCC) may send not only a PDCCH to schedule the PDSCH of DL CC A using CIF, but also a PDCCH to schedule the PDSCH of another CC (cross-carrier scheduling). On the other hand, PDCCH is not transmitted within another DL CC. Therefore, depending on whether cross-carrier scheduling is configured for the UE, the UE will either monitor a PDCCH without a CIF to receive a self-carrier scheduled PDSCH, or monitor a PDCCH with a CIF to receive a cross-carrier scheduled PDSCH.

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

[0082] Figure 11 is a block diagram showing the configurations of a terminal and a base station according to one embodiment of the present disclosure.

[0083] In the embodiments of this disclosure, the terminal can be embodied as various wireless communication devices or computer devices that ensure portability and mobility. The terminal may also be referred to as UE (User Equipment), STA (Station), MS (Mobile Subscriber), etc. In the embodiments of this disclosure, the base station may control and manage cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to the service area and have functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may also be referred to as gNB (next Generation Node B) or AP (Access Point), etc.

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

[0085] First, the processor 110 can execute various instructions or programs and process data inside the terminal 100. Furthermore, the processor 110 can control the overall operation of the terminal 100, including each unit, and control data transmission and reception between units. Here, the processor 110 may be configured to perform the operations described in the embodiments of this disclosure. For example, the processor 110 can receive slot configuration information, determine the slot configuration based on this information, 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 may be equipped with multiple network interface cards (NICs), such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either internally or externally. In the figure, the communication module 120 is shown as a single integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawing.

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

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

[0089] The unlicensed band communication interface card 123 uses a third frequency band, which is an unlicensed band, to send and receive wireless signals with at least one of the base station 200, an external device, or a server, and provides communication services in the unlicensed band based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module that uses an unlicensed band. For example, the unlicensed band may be a band of 2.4GHz, 5GHz, 6GHz, 7GHz, or 5GHz or higher than 52.6GHz. At least one NIC module of the unlicensed band communication interface card 123 can communicate wirelessly with at least one of the base station 200, an external device, or a server, independently or dependently, in accordance with 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 by the terminal 100 and various data associated with it. 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, an external device, or a 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. Furthermore, the user interface 140 can output based on instructions from the processor 110 using various output means.

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

[0093] Furthermore, the base station 200 according to one embodiment of the present disclosure may 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 within the base station 200. Furthermore, the processor 210 can control the overall operation of the base station 200, including each unit, and control data transmission and reception between units. Here, the processor 210 may be configured to perform the operations described in the embodiments of this disclosure. For example, the processor 210 can signal slot configuration information and communicate 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. For this purpose, the communication module 220 may be equipped with multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, either internally or externally. In the figure, the communication module 220 is shown as a single integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawing.

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

[0097] The cellular communication interface card 222 can transmit and receive wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and can provide cellular communication services in a second frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 222 may include at least one NIC module that uses 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 in accordance with a cellular communication standard or protocol of a frequency band of 6 GHz or higher that the NIC module supports.

[0098] The unlicensed band communication interface card 223 uses a third frequency band, which is an unlicensed band, to send and receive wireless signals with at least one of the terminal 100, an external device, or a server, and provides communication services in the unlicensed band based on instructions from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module that uses an unlicensed band. For example, the unlicensed band may be a 2.4GHz, 5GHz, 6GHz, 7GHz, or 5GHz band above 52.6GHz. At least one NIC module of the unlicensed band communication interface card 223 can communicate wirelessly with at least one of the terminal 100, an external device, or a server, independently or dependently, in accordance with the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0099] The terminal 100 and base station 200 shown in Figure 11 are block diagrams according to one embodiment of the present invention, and the separately displayed blocks logically distinguish and show the elements of the device. Therefore, the above-described elements of the device may be mounted as a single chip or as multiple chips depending on the device design. In addition, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be selectively provided in the terminal 100. Furthermore, the user interface 140 and the display unit 150, etc., may be further provided in the base station 200 as needed.

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

[0101] A terminal can receive information about each symbol type in a slot from the base station using cell-specific or cell-common RRC (radio resource control) signals. Alternatively, the terminal can receive information about each symbol type in a slot semi-statically using SIB1. Furthermore, the terminal can semi-statically receive information about each symbol type in a slot from the base station using terminal-specific or terminal-dedicated RRC signals. The base station can use the information about each symbol type in a slot to configure / set each symbol type in the slot on the terminal.

[0102] When a terminal receives information about each symbol type in a slot from a base station via a cell-specific RRC signal, the information about each symbol type may include at least one of the following: the period of the cell-specific slot; the number of slots consisting only of downlink symbols from the cell-specific slot where the period begins; the number of downlink symbols from the first symbol of the slot immediately following the last slot consisting only of downlink symbols; the number of slots consisting only of uplink symbols from the last cell-specific slot of the period; and the number of uplink symbols immediately following the last slot among the slots consisting only of uplink symbols. Furthermore, when a terminal receives information about each symbol type in a slot from a base station via a cell-specific RRC signal, the information about each symbol type may include up to two slot patterns. In this case, each of the two patterns may be applied sequentially to the symbol in the time domain. Downlink symbols, uplink symbols, and flexible symbols constructed 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 a terminal receives information about each symbol type in a slot from a base station via a terminal-specific RRC signal, the cell-specific flexible symbol may be set to either a downlink symbol or an uplink symbol. In this case, the information about each symbol type may include at least one of the following: 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, or the number of uplink symbols from the last symbol of the slot indicated by the index. Alternatively, the terminal may be set so that all symbols in a slot are downlink symbols, or so that all symbols in a slot are uplink symbols. Downlink symbols, uplink symbols, and flexible symbols configured based on the terminal-specific RRC signal can be called terminal-specific downlink symbols, terminal-specific uplink symbols, and terminal-specific flexible symbols, respectively.

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

[0105] The terminal may receive a dynamic SFI via GC-PDCCH and be instructed whether the symbol in the slot is a cell-specific flexible symbol, or whether the terminal-specific flexible symbol is a downlink symbol, uplink symbol, or flexible symbol. In other words, only flexible symbols semi-statically configured on the terminal may be instructed by the dynamic SFI to be one of the downlink symbol, uplink symbol, or flexible symbol. The terminal does not need to expect that semi-statically configured downlink or uplink symbols will be instructed as other types of symbols by the dynamic SFI. The terminal may perform blind decoding at monitoring cycles set by the base station to receive a GC-PDCCH transmitting DCI format 2_0 including the dynamic SFI. If the terminal successfully receives the GC-PDCCH by performing blind decoding, the terminal can apply the information regarding the slot format indicated by the dynamic SFI, starting from the slot that received the GC-PDCCH.

[0106] A terminal may be configured with a combination of slot formatting that can be instructed by a dynamic SFI from the base station. A slot formatting combination is available for each of 1 to 256 slots, and a terminal may be configured with a slot formatting combination for any one of these 1 to 256 slots using dynamic SFI, which may include an index indicating which slot the slot formatting combination applies to. Table 3 shows the slot formatting combinations for each slot (see 3GPP TS38.213).

[0107] [Table 3]

[0108] In Table 3, D represents the downlink symbol, U represents the uplink symbol, and F represents the flexible symbol. As shown in Table 3, a maximum of two DL / UL switching operations may be permitted within a single slot.

[0109] In this specification, configuration, setting, and instruction may be used interchangeably. That is, "~ is configured," "~ is set," and "~ is instructed" may have the same meaning, and similarly, "~ is configured," "~ is set," and "~ is directed" may have the same meaning.

[0110] Figures 12 to 18 show a subband setting method according to one embodiment of the present invention.

[0111] In TDD or ampered spectrum systems, when a terminal is configured or instructed to set a slot format, allocating a limited time-domain resource as an uplink resource can lead to problems such as reduced uplink coverage, increased latency, and reduced capacity. To address these issues, 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, the terminal can only perform either downlink reception or uplink transmission at a time on the same specific time-domain resource, supporting only half-duplex communication.

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

[0113] Referring to Figure 12, a terminal may be configured with a cell-specific slot semi-statically. The terminal can perform downlink reception or uplink transmission on resources scheduled by the base station. Resources scheduled for PDSCH reception on the first UE and resources scheduled for PUSCH transmission on the second UE may contain the same symbol in the time domain, but may be different RBs in the frequency domain. A method in which one base station schedules specific time-domain resources for multiple UEs to use for both downlink reception and uplink transmission would be inefficient considering inter-cell interference, spectral regulation, and power consumption for terminal PDCCH monitoring. The following describes a method to resolve such inefficient situations. In this specification, subbands may be set on frequency-domain resources within time-domain resources (slots or symbols). In this case, the frequency-domain resources may be included within the terminal's carrier bandwidth.

[0114] Spectrum partitioning

[0115] The terminal may be configured in the frequency domain as a set of multiple subbands, providing a specific time-domain resource (cell-specific flexible slot / symbol) usable for both downlink reception and uplink transmission from the base station. The multiple subbands may be of the same or different formats. The subband format may include downlink subbands, uplink subbands, and flexible subbands. A downlink subband may consist of one or more downlink RBs, an uplink subband may consist of one or more uplink RBs, and a flexible subband may consist of one or more flexible RBs, where downlink RBs represent resources usable for downlink reception and uplink RBs represent resources usable for uplink transmission. A flexible RB may represent a resource that can be used for both downlink reception and uplink transmission depending on the base station configuration.

[0116] (Method 1-1) When a terminal is configured with multiple subbands, there may be at most one subband of the same format. That is, a single cell-specific flexible slot / symbol section may consist of at most one downlink subband, one uplink subband, and one flexible subband. Referring to Figure 13, a cell-specific flexible slot / symbol may be configured as multiple subbands. In this case, the multiple subbands may consist of one downlink subband, one uplink subband, and one flexible subband. Guard bands may be required to minimize the effects of UL / DL interference between the downlink and uplink subbands. Limiting the number of subbands of the same format to only one is to increase the efficiency of frequency resources during downlink reception and uplink transmission by minimizing the number of guard bands and configuring the downlink subband, uplink subband, and flexible subband.

[0117] (Method 1-2) Also, when a terminal is configured with multiple subbands, there may be multiple subbands of the same format. That is, a single cell-specific flexible slot / symbol section may have one or more of the following: downlink subband, uplink subband, or flexible subband. Referring to Figure 14, a cell-specific flexible slot / symbol may be configured as multiple subbands. In this case, the multiple subbands may be configured as one downlink subband, two uplink subbands, and two flexible subbands.

[0118] The multiple subbands in Method 1-1 and Method 1-2 may consist of non-overlapping RBs in the frequency domain.

[0119] In Methods 1-1 and 1-2, the flexible subband may be configured considering a guard band between the uplink subband and the downlink subband. That is, there may be at least one flexible subband between the uplink subband and the downlink subband. Method 1-1 requires fewer guard bands than Method 1-2. Therefore, more resources may be available for downlink reception and uplink transmission. Also, compared to Method 1-2, Method 1-1 allows for the use of more frequency resources when CORESET resources for PDCCH monitoring are configured at the terminal, so CORESET can be flexibly configured within a single downlink subband (or flexible subband). Furthermore, Method 1-1 may also allow for more frequency domain resources to be available for uplink transmission compared to Method 1-2. Therefore, Method 1-1 may be more advantageous than Method 1-2 in terms of frequency resource utilization efficiency. The methods described herein below are based on, but are not limited to, Method 1-1. In this specification, an RB in the downlink subband is referred to as a downlink RB, an RB in the uplink subband is referred to as an uplink RB, and an RB in the flexible subband is referred to as a flexible RB.

[0120] The method of configuring multiple 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, a terminal may configure multiple subbands in the frequency domain for cell-specific downlink slots or symbols and cell-specific flexible slots or symbols. Alternatively, a terminal may configure multiple subbands in the frequency domain for cell-specific uplink slots or symbols and cell-specific flexible slots or symbols.

[0121] The method for configuring multiple subbands in the frequency domain may be applied to terminal-specific flexible slots or symbols. Furthermore, the method for configuring multiple subbands in the frequency domain may be applied to terminal-specific downlink slots or symbols.

[0122] Semi-static subband format configuration

[0123] A terminal may semi-statically configure a subband using a cell-specific RRC signal or SIB1. The terminal can configure a subband by semi-statically receiving information for subband configuration from the base station. The information for subband configuration may include information related to the subband's location and information related to the subband's type (RB type).

[0124] (Method 2-1) The terminal may receive information for subband configuration from the base station and set the number of downlink RBs and uplink RBs. At this time, the information for subband configuration may include at least one of the following: an index for any one slot in 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 subband and uplink subband. Among the RBs in a slot, RBs that are not set as downlink RBs or uplink RBs may be determined to be flexible RBs. Referring to Figure 15, 1) the index for a 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 are downlink RBs. 4) A subband consisting of X RBs from the first RB of slot n may be an uplink subband, and a subband consisting of Y RBs from the last RB of slot n may be a downlink subband. Alternatively, contrary to Figure 15, a subband consisting of X RBs starting from the first RB in slot n may be set as the downlink subband, and a subband consisting of Y RBs starting from the last RB in slot n may be set as the uplink subband.

[0125] (Method 2-2) The terminal receives information for subband configuration from the base station and may set the number of flexible RBs and the starting RB. At this time, the information for subband configuration may include at least one of the following: an index for any one slot among the slots in the 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 subband and the uplink subband. Among the RBs in a slot, RBs that are not configured as flexible RBs may be determined to be downlink RBs and uplink RBs. Referring to Figure 16, 1) the index for the slot is n, 2) the index of the first flexible RB in slot n is X, 3) only X to Y RBs are flexible subbands, and 4) the subbands in slot n excluding the flexible subband may be set as the downlink subband and the uplink subband. That is, the uplink subband may be configured with RBs from the first RB in slot n up to the first flexible RB of the flexible subband, and the downlink subband may be configured with RBs from the last RB in slot n up to the last RB of the last flexible subband. Conversely, the downlink subband may be formed by the RBs from the first RB of slot n to the first flexible RB of the flexible subband, and the uplink subband may be formed by the RBs from the last RB of slot n to the last RB of the last flexible subband.

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

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

[0128] The flexible subband may be located between the downlink subband and the uplink subband. Therefore, the terminal has the effect of being able to 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, information for subband configuration may be transmitted to all terminals within the cell in common, and in this case, the downlink RB, uplink RB, and flexible RB set for each terminal may be set on a CRB (common resource block) basis. In addition, in methods 2-1, 2-2, and 2-3, information for subband configuration may be transmitted to specific terminals within the cell, and in this case, the downlink RB, uplink RB, and flexible RB set for each terminal may be set on a PRB (physical resource block) basis.

[0130] Methods 2-1, 2-2, and 2-3 have the effect of allowing all subband information to be confirmed even when the terminal only partially receives information for the subband configuration. In methods 2-1 and 2-2, RBs in the semi-static downlink subband can be referred to as semi-static downlink RBs, RBs in the semi-static uplink subband as semi-static uplink RBs, and RBs in the semi-static flexible subband as semi-static flexible RBs.

[0131] Methods for semi-statically configuring subbands based on methods 2-1, 2-2, and 2-3 may include cell-specific flexible slots or symbols, cell-specific downlink slots or symbols, and cell-specific uplink slots or symbols. Therefore, a terminal may have subbands semi-statically configured for cell-specific downlink slots or symbols and cell-specific flexible slots or symbols. Alternatively, a terminal may have subbands semi-statically configured for cell-specific uplink slots or symbols and flexible slots or symbols. Alternatively, methods for semi-statically configuring subbands based on methods 2-1, 2-2, and 2-3 may include terminal-specific flexible slots or symbols. Furthermore, methods for semi-statically configuring subbands based on methods 2-1, 2-2, and 2-3 may include terminal-specific downlink slots or symbols.

[0132] A method can be implemented in which a terminal semi-statically configures a subband based on methods 2-1, 2-2, and 2-3 using a cell-specific RRC signal, SIB1, or terminal-specific RRC signal.

[0133] The index for any one of the slots within a period included in the information for the subband configuration described above may be multiple. In other words, a terminal may have subbands configured for multiple slots within a period.

[0134] Dynamic subband format indication

[0135] A terminal may have its subband format configured (set / instructed) by dynamic signaling. That is, a terminal may have its subband format configured by DCI transmitted in PDCCH. If a terminal does not receive a semi-static format configuration, it may consider all frequency domain resources within a slot as a semi-static flexible subband. The terminal may then have its subband format dynamically instructed by DCI. That is, semi-static downlink and uplink subbands configured by a semi-static format configuration will not be instructed to be in a different format by DCI. If a terminal does not have a semi-static subband format configured, it may apply the subband format instructed by DCI to a cell-specific flexible slot / symbol. The subband format instructed by DCI can be called a dynamic subband.

[0136] A terminal may be instructed to specify a subband RB in the frequency domain by the RIV scheme, which is a method for specifying a continuous scheduled resource in the frequency domain within an NR system. The RIV may be a value obtained by joint coding the starting RB index and the number of consecutively allocated RBs. Equation 1 shows a method for determining the RIV (see 3GPP TS38.214). [Formula 1]

number

[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 can 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 2 consecutive RBs starting from RB#1 in the frequency domain are allocated.

[0139] Hereinafter, a method in which the terminal is instructed by the base station in the form of RIV of the 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[[ID=3|0]] 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 2 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 consecutively assigned RB, and L2 may be the number of the second consecutively assigned RB. According to Table 5, N size F If the value is 4, the RIV value may be any one value between 0 and 14. The terminal can determine the number of RBs to be consecutively assigned to the downlink and uplink subbands based on the indicated RIV value. That is, the terminal can determine L1 as the number of RBs to be consecutively assigned to the uplink subband and L2 as the number of RBs to be consecutively assigned to the downlink subband. Conversely, the terminal can determine L1 as the number of RBs to be consecutively assigned to the downlink subband and L2 as the number of RBs to be consecutively assigned to the uplink subband.

[0143] When a terminal determines L1 and L2 as the number of RBs to be consecutively assigned to an uplink (or downlink) subband and a downlink (or uplink) subband, respectively, the terminal can implicitly determine the starting RB index for each subband by a semi-statically configured subband format. Specifically, when L1 and L2, as instructed for a semi-static flexible subband by Method 3-1, are applied, the starting RB for a downlink subband may be determined to be the RB before or after a semi-statically configured cell-specific downlink subband, and the starting RB for an uplink subband may be determined to be the RB before or after a semi-statically configured cell-specific uplink subband. In addition, RBs in a semi-static flexible subband that have not been determined to be dynamic downlink subbands and dynamic uplink subbands may be determined to be dynamic flexible subbands. Referring to Figure 17, the terminal may instruct a semi-static flexible subband to use L1 as the number of RBs consecutively assigned to a dynamic uplink subband, and L2 as the number of RBs consecutively assigned to a dynamic downlink subband. Furthermore, in a semi-static subband configuration, the semi-static uplink subband may be configured from the first RB in slot n to the RB before the first dynamic subband RB (dynamic uplink (or downlink) subband RB), and the semi-static downlink subband may be configured from the last RB in slot n to the RB after the dynamic subband RB ((dynamic uplink (or downlink) subband RB)). Therefore, the terminal can determine that the RBs from the next RB in the semi-statically configured uplink subband to only L1 are the dynamic uplink subband, and that the RBs from the previous RB in the semi-statically configured downlink subband to only L2 are the dynamic downlink subband. In a semi-static flexible subband, the terminal can determine that the RBs that are not dynamically designated as downlink subbands or uplink subbands are the dynamic flexible subbands.

[0144] (Method 3-2) The terminal may be instructed with the index and number of RBs of the starting RB of the flexible subband as information for subband configuration. The terminal may be instructed with a single joint-coded value as the index and number of RBs of the starting RB of the flexible subband. When the single value is determined in the form of RIV, the single value may be obtained by Equation 1. In this case, N in Equation 1 size BWP N instead size F Used, N size F This is the same as the definition in Equation 2. Also, RBs that have not been determined to be dynamic flexible subbands may be determined to be dynamic downlink subbands and dynamic uplink subbands. In this case, the dynamic downlink subbands and dynamic uplink subbands may consist of RBs that are continuous in the frequency domain with semistatically configured semistatic downlink subbands and semistatic uplink subbands. Referring to Figure 18, the dynamic flexible subband may be located within a semistatic 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 assigned to the dynamic flexible subband. The terminal can determine the dynamic flexible subband based on the index of the starting RB and the number of continuous RBs set for the semistatic flexible subband. The terminal can determine RBs that are not set as dynamic flexible subbands among the semistatic flexible subbands as RBs of the dynamic downlink subband and dynamic uplink subband. The terminal can determine RBs that are continuous with the semistatic downlink subband among the RBs that have not been set for the configuration of the dynamic flexible subband as RBs of the dynamic downlink subband. The terminal can determine that among the RBs not designated as dynamic flexible subbands, those RBs that are adjacent to a semi-static uplink subband are dynamic uplink subband RBs.

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

[0146] (Method 3-3) The base station can instruct the terminal of the index and number of starting RBs for the uplink (or downlink) subband. The terminal may be instructed by the base station to be a single joint-coded value as the index and number of starting RBs. In this case, the single joint-coded value can be obtained by Equation 1 above. The terminal can determine that RBs not instructed as uplink (or downlink) RBs are downlink (or uplink) RBs or flexible RBs. The number of flexible RBs may be the number of flexible RBs that the terminal semi-statically sets or determines. The terminal can determine that RBs that are not uplink (or downlink) RBs or flexible RBs are downlink (or uplink) RBs.

[0147] The flexible subband may be located between the downlink subband and the uplink subband. Therefore, the terminal can determine the location of the flexible subband without ambiguity, even without being separately instructed on the starting index of the flexible RB.

[0148] In methods 3-1, 3-2, and 3-3, the dynamic downlink subband, dynamic uplink subband, and dynamic flexible subband may be composed of continuous RBs in the frequency domain.

[0149] In methods 3-1, 3-2, and 3-3, information for subband configuration may be transmitted commonly to terminals within the cell, and in this case, the downlink RB, uplink RB, and flexible RB set for each terminal may be set on a CRB (common resource block) basis.

[0150] When a terminal is instructed to use a dynamic subband format by methods 3-1, 3-2, or 3-3, the subband format information may be transmitted to the terminal via group common signaling. For example, the dynamic subband format information may be included in DCI format 2_0 used for legacy NR. DCI format 2_0 may be transmitted as GC-PDCCH, and GC-PDCCH may be CRC scrambled with SFI-RNTI for the terminal receiving the subband format information. The terminal can perform blind decoding at each monitoring cycle set by the base station to receive GC-PDCCH containing DCI format 2_0 containing the subband format information. If the terminal successfully receives GC-PDCCH by performing blind decoding, the terminal can apply the subband format information from the slot that received the PDCCH at the monitoring cycle set by the base station. Furthermore, the dynamic subband format information may be transmitted in a new DCI format (e.g., DCI format 2_x) rather than the DCI format used for legacy NR. DCI format 2_x may be transmitted via GC-PDCCH, which can transmit SFI-F (slot formation indication in frequency domain) to inform the terminal receiving subband 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 monitoring cycles set by the base station to receive PDCCH containing DCI format 2_x. If the terminal successfully receives GC-PDCCH by performing blind decoding, the terminal can apply the subband format information from the slot where the GC-PDCCH was received at monitoring cycles set by the base station.

[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 the sub - band 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 set the sub - band for cell - specific downlink slots or symbols and cell - specific flexible slots or symbols. Also, the terminal may be dynamically instructed to set the sub - band for cell - specific uplink slots or symbols.

[0154] The methods for dynamically configuring a terminal's subbands based on methods 3-1, 3-2, and 3-3 may be applied to terminal-specific flexible slots or symbols. Furthermore, the methods for dynamically configuring a terminal's subbands based on methods 3-1, 3-2, and 3-3 may be applied to terminal-specific downlink slots or symbols.

[0155] Sending an uplink

[0156] This section describes how a terminal can transmit a physical uplink sharing channel (PUSCH). A terminal can transmit uplink data (e.g., UL-SCH TB) to a base station via PUSCH. In this case, the terminal can transmit uplink data by scheduling a PUSCH from the DCI within the PDCCH (DG, dynamic grant), or by transmitting a PUSCH using pre-configured resources and transmission methods from the base station (CG, configured grant).

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

[0158] The time-domain information of PUSCH indicated by the TDRA field in DCI format 0_0, 0_1, or 0_2 includes the following: - K2: (i) The offset value between the slot where the terminal receives PDCCH from the base station and (ii) the slot where the terminal sends PUSCH to the base station. - SLIV (starting and length indication value): This is a value that combines the starting symbol index (S) and the symbol length (L) of the PUSCH within the slot indicated by the K2 value. The terminal may have K2 and SLIV set by the base station. Alternatively, the terminal may have K2, S, and L set by the base station.

[0159] If the terminal receives a DCI (e.g., DCI format 0_0, 0_1, or 0_2) to schedule a PUSCH in slot n, then slot floor(n*2 μPUSCH / n*2 μPDCCH )+K2 is determined to be the slot to send PUSCH. Here, μPUSCH and μPDCCH are the SCS of the cell (or BWP) where PUSCH is scheduled and the cell (or BWP) where PDCCH is received, respectively.

[0160] PUSCH may be set to either PUSCH mapping Type A or PUSCH mapping Type B. When the terminal is set to PUSCH mapping Type A, the terminal may be allocated only PUSCH resources that include the DMRS symbol, and the DMRS symbol is located in the third or fourth symbol of the slot indicated by the K2 value, depending on the value set by the base station. That is, when the terminal is set to PUSCH mapping Type A, the starting symbol index (S) of PUSCH may be 0, the symbol length (L) of PUSCH may be set / indicated to one value between 4 and 14 (12 for extended CP), or SLIV may be set / indicated to one value between 4 and 14 (12 for extended CP). When the terminal is set to PUSCH mapping Type B, the first symbol of PUSCH is at least the DMRS symbol, the starting symbol index of PUSCH may be set to one value between 0 and 13 (11 for extended CP), and the symbol length of PUSCH may be set to one value between 1 and 14 (12 for extended CP). Alternatively, if the terminal is set to PUSCH mapping Type B and PUSCH repetition Type A, SLIV may be set to one of the values ​​from 1 to 14 (12 in the case of extended CP). If the terminal is set to PUSCH mapping Type B and PUSCH repetition Type B, SLIV may be set to one of the values ​​from 1 to 27 (23 in the case of extended CP).

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

[0162] In the case of uplink resource allocation type 0, a fixed number of PRBs (Resource Blocks) included in the BWP (Base Point Program) configured on the terminal are grouped together to form an RBG (resource block group). The terminal is then instructed on a bitmap for each RBG to decide whether or not to use that RB. The number of PRBs included in a single RBG may be composed of base stations. The more PRBs included in the BWP configured on the terminal, the more PRBs may be included in a single RBG. If the bit value indicated in the bitmap is 0, the terminal determines / analyzes that no PUSCH is scheduled for any PRB within that RBG; if the bit value is 1, the terminal determines / analyzes that PUSCH is scheduled for all PRBs within that RBG. Alternatively, the bit values ​​may be reversed depending on the implementation method.

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

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

[0165] The NR system supports the CG (configured grant)-based PUSCH (hereinafter, CG-PUSCH) transmission method to support uplink URLLC transmission, etc. The CG-PUSCH transmission method is also called the grant-free transmission method. In the CG-PUSCH transmission method, the terminal has resources available for PUSCH transmission pre-configured by the base station via higher layer (e.g., RRC) signals, and transmits PUSCH using those resources. The CG-PUSCH transmission method can be classified into the following two types depending on whether activation or release using DCI is possible.

[0166] - Type 1 PUSCH transmission with configured grant: The terminal may have the period, time / frequency resources, and transmission method for PUSCH transmission pre-configured by the base station via a higher-layer (e.g., RRC) signal. Here, the transmission method may include MCS (modulation and coding scheme), TBS (TB size), etc.

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

[0168] The CG-PUSCH transmission scheme can support repeated PUSCH transmissions in multiple slots to ensure reliable uplink transmission. In this case, the terminal and base station define the point in time that can be assumed to be the start of a CG-PUSCH transmission as follows: The terminal is configured with one of the following RV (redundancy version) sequences for repeated CG-PUSCH transmission: {0,2,3,1}, {0,3,0,3}, or {0,0,0,0}, and uses the RV value corresponding to the {mod(n-1,4)+1}th value at the nth initial TO (transmission occasion), where n is an integer greater than 0. In this case, the terminal can determine the initial TO from which repeated transmission can be started based on the configured RV sequence as follows:

[0169] - If the RV sequence is set to {0,2,3,1}: The first TO corresponding to RV=0 may be determined to be the initial TO. The terminal may begin repeated transmission of CG-PUSCH from the first TO corresponding to RV=0, and the base station attempts to receive repeated transmissions of CG-PUSCH assuming that the terminal may have begun repeated transmission.

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

[0171] - If the RV sequence is set to {0,0,0,0}: All TOs except the last TO that have RV=0 may be determined to be initial TOs. The terminal may begin repeating CG-PUSCH transmissions at all TOs except the last TO that have RV=0, and the base station attempts to receive the repeating CG-PUSCH transmissions assuming that the terminal may have begun repeating transmissions.

[0172] In wireless communication systems, to improve the reliability of PUSCH transmission and reception between base stations and terminals, terminals may be configured to receive repeated PUSCH transmissions from the base station. Repeated PUSCH transmissions that terminals can send can be classified into two types.

[0173] First, the transmission process for terminal PUSCH repetition transmission type A is as follows: When the terminal receives DCI format 0_1~0_2 in a PDCCH that schedules PUSCH from the base station, it is possible to perform PUSCH repetition transmission in up to K consecutive slots. Here, the value of K may be set by a higher layer (e.g., RRC) or indicated by the value of the TDRA field in DCI. In this case, the time / frequency resource for transmitting PUSCH in each slot is the same as the time / frequency resource indicated in DCI. That is, PUSCH may be repeatedly transmitted with the same symbol and PRB within each slot.

[0174] Next, in order to meet the requirements of URLLC and other standards, the transmission process for type B repeated push transmission, which supports low-latency repeated push transmission, is as follows: The base station may be instructed by the TDRA field to provide the start symbol (S) and length (L) of the push. Here, the push with the start symbol and length instructed by the TDRA field is not an actual push to be transmitted but a push that has been determined on an ad-hoc basis, and is called a nominal push. The terminal may also be instructed by the TDRA field to provide the nominal number of repetitions (N) of the nominal push. Therefore, the terminal can determine N nominal pushes based on the TDRA field. The length of the N nominal pushes is L, they are all the same, there are no other symbols between the nominal pushes, and they are continuous in time.

[0175] The terminal can determine the actual PUSCH from the nominal PUSCH. A single nominal PUSCH may be determined to be one or more actual PUSCHs. The terminal may be instructed / configured by the base station to include symbols that cannot be used in PUSCH repeat transmission type B. These are called invalid symbols. Invalid symbols may include symbols configured with DL symbols by TDD configuration, symbols configured for SS / PBCH block reception, symbols configured for associated CORESET reception with Type0-PDCCH CSS, and symbols configured for DL-to-UL switching. The terminal can exclude invalid symbols in the nominal PUSCH. As mentioned above, the nominal PUSCH is determined to be a continuous symbol, but it may be determined to be a discontinuous symbol when invalid symbols are excluded. The actual PUSCH may be determined to be a continuous symbol in one nominal PUSCH from which invalid symbols have been excluded. Here, if the continuous symbol crosses a slot boundary, the actual PUSCH may be divided based on the slot boundary.

[0176] This section describes how a terminal transmits a physical uplink control channel (PUCCH).

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

[0178] To transmit a PUCCH that transmits a 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 to which the scheduled PUCCH must be transmitted. Here, the value of K1 may be a non-negative integer. The K1 value in DCI format 1_0 can indicate one of {0, 1, 2, 3, 4, 5, 6, 7}. The K1 values ​​that can be indicated in DCI format 1_1 or 1_2 may be constructed or set from a higher layer (e.g., RRC).

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

[0180] In an NR system, to ensure broad coverage, terminals may be configured to repeatedly transmit long PUCCH (PUCCH format 1, 3, or 4) in 2, 4, or 8 slots. When a terminal is configured to repeatedly transmit PUCCH, the same UCI may be repeatedly transmitted in each slot. The symbolic structure of the repeatedly transmitted PUCCH is identical. That is, the repeatedly transmitted PUCCH starts with the same symbol and consists of the same number of symbols in each slot.

[0181] When a terminal repeatedly transmits a PUCCH signal, if the symbol that must transmit the PUCCH signal in a particular slot coincides with an invalid symbol (for example, a DL symbol semi-statically configured by a TDD configuration or a symbol set for receiving an SS / PBCH block), the terminal may not transmit the PUCCH signal in that slot and postpone the transmission to the next slot. Subsequently, if the symbol that must transmit the PUCCH signal in the slot where the transmission was postponed does not coincide with an invalid symbol, the terminal can transmit the PUCCH signal in that slot.

[0182] Frequency hopping of the uplink channel

[0183] A terminal can use a frequency hopping scheme to obtain frequency diversity gain when transmitting a UL channel (e.g., PUSCH or PUCCH). Here, the frequency hopping scheme refers to transmitting the UL channel on PRB set #0 and then transmitting the same 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 will be called hop 0, and the UL channel transmitted on PRB set #1 will be called hop 1. In the following description, a maximum of two hops (e.g., hop 0 and hop 1) will be mentioned, but the number of hops may be greater.

[0184] The method for determining the PRB set for hop 0 (i.e., PBB set #0) and the PRB set for hop 1 (i.e., PBB set #1) when a terminal sends a PUSCH or PUCCH is as follows:

[0185] First, let's explain frequency hopping during PUCCH transmission.

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

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

[0188] Table 6 shows multiple cell-common PUCCH resource sets. Each index corresponds to a single cell-common PUCCH resource set and is indicated by 4 bits of 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 said PUCCH resource is PUCCH resource index r PUCCH The selection / decision may be made based on r. PUCCH This may be determined based on the PUCCH resource indicator (PRI) included in the DCI format that schedules PUCCH (e.g., DCI format 1_0, 1_1, or 1_2), and the index of the CCE that received the DCI format (e.g., the smallest CCE index), as follows:

number

[0191] Cell-common PUCCH resource set and r PUCCH By combining these factors, the RB set used for PUCCH transmission, frequency hopping direction, initial CS (cyclic shift), etc., may be determined. 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 consists of one PRB.

[0192] r PUCCHIt has one value from 0, 1, ..., 15. Therefore, the terminal has r out of 16 PUCCH resources. PUCCH PUCCH transmission can be performed using the corresponding PUCCH resource.

[0193] For example, r PUCCH If it is one of the values ​​0, 1, ..., 7, then the PRB index of hop 0 of the PUCCH resource is

number

number

number

number

[0194] Here, N size BWP This is the number of PRBs included in the active BWP that transmits PUCCH. Here, when 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 to establish a cell connection and is composed of SIB1. CS This represents the number of initial CS indexes. RB offset BWP The number of initial CS indices is shown in Table 6.

[0195] Here, if the PRB index at hop 0 is 0, then the PRB represents the lowest PRB of the terminal's active BWP. In other words, the PRB index at hop 0 is parsed as the index of the active BWP. When PUCCH sends the HARQ-ACK for Msg4 PDSCH, the active BWP is replaced by the initial UL BWP. In other words, the PRB index at hop 0 is parsed as the index of the initial UL BWP.

[0196] In the case of PUCCH after RRC coupling, the PRB set for frequency hopping may be determined as follows:

[0197] The lowest PRB index of the PRB set at hop 0 of PUCCH (i.e., PRB set #0) and the lowest PRB index of the PRB set at hop 1 (i.e., PRB set #1) may be set as a PUCCH resource by the terminal via an RRC signal. That is, when a terminal is instructed to use one PUCCH resource (PRI in DCI), it can transmit hop 0 and hop 1 using the lowest PRB index of the PRB set at hop 0 and the lowest PRB index of the PRB set at hop 1 that are set for the PUCCH resource. Here, if the PRB index is 0, the PRB represents the lowest PRB of the terminal's active BWP. That is, the PRB index may be parsed 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 for hop 0 (i.e., PBB set #0) by a DCI that schedules PUSCH or a DCI / RRC signal that activates PUSCH. Here, the DCI that schedules PUSCH or the DCI / RRC signal that activates PUSCH may include an FDRA field. The FDRA field may include (i) the index of the RB in which the PRB set for hop 0 begins, and (ii) the number of consecutive RBs. Here, if the index of the RB in which the PRB set for hop 0 begins is 0, then the RB represents the lowest PRB of the terminal's active BWP. That is, the index of the RB in which the PRB set for hop 0 begins may be analyzed as the index of the terminal's active BWP. For frequency hopping, the terminal must determine the index of the RB in which the PRB set for hop 1 (i.e., PBB set #1) begins. This may be determined by the following formula.

number

[0199] Here, RB start (0) represents the RB index where the PRB set for hop 0 begins, RB start (1) represents the RB index where the PRB set for hop 1 begins. RB offset This represents the PRB interval between the PRB set at hop 0 and the PRB set at hop 1. The base station sends the RB to the terminal. offset You can set / instruct RB offset The values ​​are 0, 1, ..., N size BWP It can be any one of the values ​​from -1. size BWPThis represents the number of PRBs included in the terminal's active BWP. If the index of the RB where the hop 1 PRB set begins, as calculated by the above formula, is 0, then the RB represents the lowest PRB in the terminal's active BWP. That is, the index of the RB where the hop 1 PRB set begins (RB start (1)) can be parsed as the index of the terminal's active BWP.

[0200] Table 7 shows the PRB offset RB for hop 1 when PUSCH sends Msg3 during the RACH process (hereinafter, Msg3 PUSCH). offset This shows that N size BWP This is the number of RBs included in the initial UL BWP. According to Table 7, if the number of RBs included in the initial UL BWP is less than 50, then RB offset teeth,

number

number

[0201] [Table 7]

[0202] For initial transmission of Msg3 PUSCH, whether or not to frequency hop can 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. For retransmission of Msg3 PUSCH, whether or not to frequency hop can be indicated by a 1-bit FH flag in the DCI format 0_0 scrambled by TC-RNTI that schedules Msg3 PUSCH. If the value of the FH flag is 0, the terminal sends Msg3 PUSCH without frequency hopping; if it is 1, the terminal sends Msg3 PUSCH with frequency hopping.

[0203] In this specification, hop 0 may be replaced with the first hop, and hop 1 may be replaced with the second hop.

[0204] When a terminal is configured / instructed to transmit PUSCH or PUCCH using a frequency hopping scheme, it may be configured / instructed to use one of the following frequency hopping methods:

[0205] - Intra-slot frequency hopping:

[0206] In the case of a PUSCH transmission, the terminal can divide the PUSCH in the time domain in half within the slot in which the PUSCH transmission is instructed, map it to two hops, and transmit it. Here, the PUSCH transmission may or may not be a PUSCH repetition. The length of the symbol assigned to the PUSCH in one slot is N. PUSCH,s symb In this case, at the first hop, floor(N PUSCH,s symb Map (2) symbols to PUSCH, and in the second hop {N PUSCH,s symb -floor(N PUSCH,s symbYou may map} symbols to PUSCH, where floor() represents the truncation function.

[0207] In the case of a PUCCH transmission, the terminal can divide the PUCCH in the time domain in half within the slot in which the PUCCH transmission is instructed, and map it to two hops for transmission. Here, a PUCCH transmission may or may not be a PUCCH repetition transmission. If the length of the symbols allocated to a PUCCH in one slot is called the number of symbols, then 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 a push repeat transmission, the terminal can map the push transmit to the first or second hop based on the absolute slot index in the radio frame of the slot containing the push repeat transmission. Here, if the index in the radio frame of the slot containing the push repeat transmission is even, the push transmit can be mapped to the first hop, and if the index in the radio frame of the slot containing the push repeat transmission is odd, the push transmit can be mapped to the second hop.

[0210] In the case of PUCCH repetition, the terminal can sequentially assign a slot index for repetition, starting from the first slot instructed to perform PUCCH repetition. The terminal can determine that the slot index for the first slot instructed to perform PUCCH repetition is 0. For subsequent slots, the terminal can sequentially assign a slot index regardless of whether a PUCCH transmission occurred in that slot. The terminal can send a PUCCH at the first hop for slots with even-numbered slot indices, and a PUCCH at the second hop for slots with odd-numbered slot indices.

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

[0212] The problem that this invention seeks to solve concerns the case when a terminal transmits by frequency hopping on an uplink channel (e.g., PUSCH or PUCCH) when the subband format is set semi-statically or dynamically specified.

[0213] For example, a terminal may be configured or instructed to set up an uplink subband for a flexible slot / symbol or a downlink slot / symbol. The terminal may also be configured or instructed to transmit PUSCH or PUCCH by frequency hopping in the slot / symbol for which the uplink subband is configured or instructed.

[0214] First, let's clarify the terminology used in this invention.

[0215] - SBFD (subband non-overlapping full duplex): This refers to a method that supports simultaneous transmit and receive operation using subbands within a cell / BWP. Here, a subband refers to a frequency band set / instructed for SBFD operation within a cell / BWP. A single subband may consist of a single consecutive (P)RB set. Examples of subband configurations / formats can be found in Figures 12 to 18. For example, in the case of an unpaired spectrum (i.e., a TDD cell / BWP), a UL subband may be configured on a DL slot / symbol or on a flexible slot / symbol. Alternatively, in the case of an unpaired spectrum, a DL subband may be configured on a UL slot / symbol or on a flexible slot / symbol. Also, in the case of a paired spectrum (i.e., an 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 SBFD and non-SBFD intervals that have been time-determined in the time domain.

[0216] - SBFD interval: This refers to a time interval in which a subband is 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 an SBFD slot and / or an SBFD symbol. An SBFD interval may contain one or more subbands in the frequency domain. If multiple subbands are configured in an SBFD interval, the subbands are FDM. Multiple subbands (DL subbands or UL subbands) in an SBFD interval may be configured so as not to overlap in the frequency domain (non-overlapping).

[0217] - Non-SBFD interval: This refers to a time interval in which no subbands are set / instructed on a cell / BWP. A non-SBFD interval includes non-SBFD slots and / or non-SBFD symbols. A non-SBFD interval can also refer to a legacy or normal interval. A non-SBFD interval includes at least one of DL symbols, flexible symbols, and UL symbols, depending on the slot format. For example, if SBFD operation is set / instructed for a UL BWP, a non-SBFD interval includes UL slots / symbols.

[0218] - Determine the (frequency) hop: This means determining the resource (e.g., PRB) corresponding to the frequency hop.

[0219] - Legacy NR system: This refers to a system that operates according to existing NR methods because SBFD operation is not supported or configured.

[0220] For convenience, the following example illustrates the case where SBFD operation is configured in UL BWP. However, the present invention may also be applied in the same way when SBFD operation is configured in TDD cell / BWP.

[0221] 1) PUSCH case

[0222] When a terminal is configured or instructed to transmit a PUSCH by frequency hopping in a slot / symbol where the uplink subband is set, it can determine the first and second hops in the frequency domain in the manner described above.

[0223] According to existing methods, the value configured or instructed by the base station to determine the first or second hop may be applied identically to other slots / symbols as well as slots / symbols where subbands are configured. In other words, under existing methods, the value configured or instructed for frequency hopping is applied identically to all slots / symbols regardless of the slot / symbol type. For example, the offset value RB configured by the base station to determine the second frequency hop. offset This may be applied identically not only to slots / symbols with subbands configured, but also to other slots / symbols. In other words, the offset value set by the terminal for frequency hopping from the base station may be applied identically to slots / symbols with subbands configured and slots / symbols without subbands configured. Also, the number of PRBs N that constitute UL BWP size BWP This can be applied identically to slots / symbols with and without subbands. In this case, the second hop may include a PRB outside the uplink subband, and if that PRB is a downlink PRB, a problem arises where PUSCH cannot be transmitted at the second hop.

[0224] For example, referring to Figure 19, the terminal may be configured or instructed to repeatedly transmit PUSCH in the (uplink) slots (slots n+1 to n+3) and the (uplink) slot (slot n+4) where a subband is not configured, with an initial (UL) BWP set for the cell common. The terminal may also be configured or instructed to perform intra-slot frequency hopping or inter-slot frequency hopping for repeated PUSCH transmissions. Figure 19 assumes that the terminal is configured or instructed to perform inter-slot frequency hopping for repeated PUSCH transmissions. According to Figure 19, the terminal has an initial (UL) BWP size and an offset value (RB offsetThe first and second hops can be determined using this method. In this case, in order to maximize the frequency diversity gain as used in legacy NR systems that do not consider SBFD operation, the terminal may configure an offset value for determining the frequency hop with respect to a slot where no subband is set (slot n+4). In this case, the second frequency hop may be determined as a PRB outside the uplink subband in the slot where a subband is set (slot n+2). That is, the second hop determined based on the offset value configured with respect to slot n+4 is located at a PRB outside the uplink subband in slot n+2. In other words, since the second frequency hop is set at the location of the downlink PRB, the terminal cannot transmit a PUSCH in slot n+2.

[0225] For example, referring to Figure 20, terminals #1 and #2 may have their respective configured terminal-specific (UL) BWPs activated. Referring to Figure 20(a), terminal #1 may be configured or instructed to repeatedly transmit PUSCH in the (uplink) slots (slots n to n+3) where a subband is set, and in the (uplink) slot (slot n+4) where a subband is not set. Referring to Figure 20(b), terminal #2 may be configured or instructed to repeatedly transmit PUSCH in the (uplink) slot (slot n+4) where a subband is not set, and in the (uplink) slots (slots n+5 to n+7) where a subband is set, and in the (uplink) slots (slots n+5 to n+8). In addition, terminals #1 and #2 may be configured or instructed to perform intra-slot frequency hopping or inter-slot frequency hopping for repeated PUSCH transmissions. Figure 20 assumes that terminals #1 and #2 are configured or instructed to perform inter-slot frequency hopping for push-repeated transmissions. Terminals #1 and #2 can determine the first and second hops, respectively, using (i) the size of their activated terminal-specific (UL) BWP and (ii) an offset value to determine the frequency hop configured from the base station. In this case, to maximize frequency diversity gain as in legacy NR systems that do not consider SBFD operation, the terminals may configure the offset value relative to a slot where no subband is configured (slot n+4). In this case, the second frequency hop may be determined as a PRB outside the uplink subband in slots where a subband is configured (slot n+2 in Figure 20(a), slots n+5 and n+7 in Figure 20(b)). That is, the second hop determined based on the offset value configured relative to slot n+4 is located in a PRB outside the uplink subband in slots n+2, slot n+5 and slot n+7.In other words, since the second hop is set at the downlink PRB position, the terminal cannot send PUSCH in slots n+2, n+5, and n+7.

[0226] The following describes an embodiment for solving the above problem. Specifically, an embodiment is disclosed for solving the problem in which a PUSCH cannot be transmitted when a terminal is configured or instructed to transmit a PUSCH by frequency hopping in a slot / symbol configured or instructed in the uplink subband, because the hop location is set to a resource that is not capable of uplink transmission.

[0227] Specifically, the present invention proposes a method to ensure that when frequency hopping is set in a slot or symbol designated as an uplink subband for a terminal, the frequency hop of PUSCH can be located on an uplink transmission area or uplink slot from which the terminal can transmit. Furthermore, the present invention provides a method to set the frequency hop position in the same way as in legacy NR systems that do not consider SBFD operation for slots where a subband is not set / designated (uplink).

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

[0229] Referring to Figure 21, the terminal may be configured to set an initial UL BWP common to the cell and to repeatedly transmit PUSCH in some slots (slots n+1 to n+3) of the SBFD slots (slots n to n+3) and in the non-SBFD slot (slot n+4). The terminal may also be configured to perform inter-slot frequency hopping for repeated PUSCH transmissions. In Figure 21, the terminal determines (i) the size of the initial UL BWP and (ii) the offset value (RB) configured by the base station to determine the frequency hop. offsetThe first and second hops can be determined using ). In the first embodiment, the frequency hop at which PUSCH transmission occurs may be set / determined to be located in the uplink subband transmission region in SBFD slots (slots n+1 to slots n+3), and to be the same position as in the legacy NR system in the non-SBFD slot (slot n+4).

[0230] Referring to Figure 22, terminals #1 and #2 may have their respective configured terminal-specific UL BWPs activated. Referring to Figure 22(a), terminal #1 may be configured or instructed to repeatedly transmit PUSCH in some of the SBFD slots (slots n to n+3) (slots n+1 to n+3) and in the non-SBFD slot (slot n+4). In the first embodiment, the frequency hops in which PUSCH transmission occurs may be located in the uplink subband transmission area for the SBFD slots (slots n+1 to n+3) and in the non-SBFD slot (slot n+4) to have the same position as in the legacy NR system. Referring to Figure 22(b), terminal #2 may be configured or instructed to repeatedly transmit PUSCH in the non-SBFD slot (slot n+4) and in some of the SBFD slots (slots n+5 to n+8) (slots n+5 to n+7). Furthermore, terminals #1 and #2 may be configured or instructed to perform inter-slot frequency hopping for repeated push transmissions, and the first and second hops can be determined using (i) the size of the terminal-specific UL BWP activated for terminals #1 and #2, respectively, and (ii) an offset value for determining the frequency hops configured from the base station, respectively. In the first embodiment, the terminals may be configured to have the same frequency hop positions as in the legacy NR system in the non-SBFD slot (slot n+4). On the other hand, the position of each frequency hop where push transmissions are performed in the SBFD slots (slots n+5 to slot n+7) may be configured / determined to be located on the uplink subband transmission area from which the terminal can transmit.

[0231] The first embodiment involves setting one RB offset for frequency hopping on the terminal, identical to that in an existing legacy NR system. The first embodiment is a method of setting / determining, based on the RB offset, that the frequency hop on which a push transmission occurs is located in the uplink subband transmission area on which the terminal can transmit in an SBFD slot / symbol, and in the same position as in a legacy NR system in a non-SBFD slot / symbol. According to the first embodiment, the terminal does not need to configure an additional RB offset for frequency hopping when performing uplink SBFD operation and can reuse the single RB offset for frequency hopping used in an existing legacy NR system.

[0232] Specifically, the terminal can determine the first PRB set of the first hop using a DCI that schedules PUSCH, or a DCI / RRC signal that activates CG-PUSCH. Here, the DCI that schedules PUSCH, or the DCI / RRC signal that activates 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 begins, and (ii) information about the number of consecutive RBs. Here, if the index of the RB where the first PRB set of the first hop begins is 0, then 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 begins may be analyzed as the index of the terminal's active UL BWP. Subsequently, the terminal must determine the index of the RB where the second PRB set of the second hop begins. This can be determined by the following formula.

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[0233] Here, - M is (RB start (0)+RB offset This represents a value obtained based on (RB). For example, M is (RB start (0)+RBoffset -RB start,UL ) includes. - RB start (0) represents the RB index where the first PRB set of the first hop begins, RB start (1) represents the RB index where the second PRB set of the second hop begins. - RB offset This 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 sends the RB to the terminal. offset You can set / instruct it. - RB start,UL This is the RB index of the lowest PRB available for uplink transmission in the slot or symbol that transmits PUSCH. start,UL The values ​​may differ between SBFD slots / symbols and non-SBFD slots / symbols. For example, referring to Figure 22(b), RB in slot n+4. start,UL And RB in slots n+5 to n+7 start,UL These values ​​may be different. For example, RB in an SBFD slot / symbol. start,UL This is the start PRB index of the uplink subband on the (active UL) BWP (e.g., 0, 1, ..., N). size BWP Any value of -1 (preferably a positive number), and RB in non-SBFD slots / symbols. start,UL It can be 0. - N size UL This is the number of PRBs available for uplink transmission in the active UL BWP slot / symbol. PRBs available for uplink transmission may include PRBs that are not downlink PRBs. That is, PRBs available for uplink transmission may include uplink or flexible PRBs. N in SBFD slot / symbol. size UL This may include PRBs within the uplink subband that are included in the terminal's active UL BWP. N in non-SBFD slots / symbols size UL =Nsize BWP That's fine.

[0234] According to the first embodiment described above, the second PRB set for the second hop determined by the SBFD slot or symbol and the non-SBFD slot or symbol may contain different PRBs. Referring to Figure 21, the second PRB set for the second hop determined by the terminal at slot n+2 and the second PRB set for the second hop determined at slot n+4 may contain different PRBs. Referring to Figure 22, the second PRB set for the second hop determined by terminal #1 at slot n+2 and the second PRB set for the second hop determined at slot n+4 may contain different PRBs.

[0235] Second Embodiment: In the second embodiment, the terminal can use a first RB offset for frequency hopping, just as in the existing legacy NR system, to set the frequency hop position for non-SBFD slots / symbols, just as in the legacy NR system. On the other hand, in SBFD slots / symbols, a second RB offset for SBFD operation can be set so that each frequency hop where a push transmission is performed is located on the uplink subband transmission area that the terminal can transmit from. According to the second embodiment, when the terminal and base station perform uplink SBFD operation, it is necessary to configure a second RB offset for frequency hopping for SBFD operation on the terminal.

[0236] The terminal can determine the first PRB set of the first hop using a DCI that schedules PUSCH, or a DCI / RRC signal that activates CG-PUSCH. Here, the DCI that schedules PUSCH, or the DCI / RRC signal that activates 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 begins, and (ii) the number of consecutive RBs. Here, if the index of the RB where the first PRB set of the first hop begins is 0, then 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 begins may be analyzed as the index of the terminal's active UL BWP. The terminal then must determine the index of the RB where the second PRB set of the second hop begins. For this reason, depending on whether the slot / symbol transmitting PUSCH via frequency hopping is a slot / symbol set or designated as an uplink subband, a first RB offset or a second RB offset can be applied to determine the RB index at which the second PRB set of the second hop begins.

[0237] Specifically, for non-SBFD slots / symbols, the first RB offset (i.e., RB) is calculated as follows: offset By applying this, the same frequency hop position as in legacy NR systems can be set.

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[0238] On the other hand, for SBFD slots / symbols, the second RB offset (for example, RB) is as follows: offset,SB The settings may be applied so that each frequency hop where a push transmission is performed in the SBFD slot / symbol is located within the uplink subband transmission area.

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[0239] Third Embodiment: The third embodiment is yet another method in which, similar to existing legacy NR systems, the terminal uses a first RB offset for frequency hopping to set the frequency hop position in non-SBFD slots / symbols in the same way as in legacy NR systems, and the SBFD slots / symbols use a second RB offset for SBFD operation so that the frequency hop position is located on the uplink subband transmission area. According to the third embodiment, when the terminal and base station perform uplink SBFD operation, the terminal needs to be further configured with a second RB offset for frequency hopping for SBFD operation.

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

[0241] In this case, the frequency hop position may be determined differently depending on whether the slot / symbol that transmits PUSCH by frequency hopping is a slot / symbol that is set or designated as an uplink subband. For example, depending on whether the slot / symbol that transmits PUSCH by frequency hopping is a slot / symbol that is set or designated as an uplink subband, the index of the RB where the second PRB set of the second hop begins can be determined by applying the first RB offset (Equation 9) or the second RB offset (Equation 10).

[0242] Specifically, for non-SBFD interval slots / symbols, the first RB offset (i.e., RB) is as shown in the following equation. offset By applying this, the frequency hop position can be set to be the same as in legacy NR systems.

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[0243] For SBFD slots / symbols, the following formula applies to the preceding second RB offset (i.e., RB offset,SB By applying this setting, the location of each frequency hop where a push transmission is performed in an SBFD slot / symbol can be set to be within the uplink subband transmission area on which the terminal can transmit.

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[0244] The first to third embodiments described above may also apply to Msg3 PUSCH. The terminal may be configured or instructed to transmit PUSCH by frequency hopping in the SBFD slot / symbol during the initial cell connection process. In this case, the first and second hops in the frequency domain can be determined by the method described above. Here, since the terminal is prior to RRC connection, the uplink subband may be set or instructed by information received before transmitting Msg3 PUSCH. For example, SIB1 may contain uplink subband information, and the terminal may be set or instructed to transmit 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, i.e., RB, is used. offset This is the RB of Msg3 PUSCH as explained above. offset This can be determined by applying the method used to find it (see Table 7).

[0246] Alternatively, Msg3 PUSCH's RB offset This may be determined in a manner different from the method described above. For example, the number of PRBs in the initial UL BWP that are available for uplink transmission in that slot / symbol (i.e., N) size UL If ) is less than 50RB, RB offset teeth

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[0247] [Table 8]

[0248] 2) PUCCH

[0249] When a terminal is configured or instructed to transmit a PUCCH by frequency hopping in an SBFD slot / symbol, it may consider determining the first and second hops in the frequency domain in the manner used in legacy NR systems. That is, the PUCCH resource configured by the terminal from the base station to determine the first or second hop may be applied identically to other slots / symbols as well as SBFD slots / symbols. In this case, the PRBs for the first and second hops configured for the terminal in the PUCCH resource may include PRBs outside the uplink subband, and if such PRBs are downlink PRBs, the terminal cannot transmit a PUCCH at those hops.

[0250] The following describes the PUCCH frequency hopping method to solve the above-mentioned problem. For convenience, the PRB index used to determine the PRB of the first hop is called the first hopping PRB index, and the PRB index used to determine the PRB of the second hop is called the second hopping PRB index.

[0251] First Embodiment: The terminal may further configure an additional second hopping PRB index (hereinafter referred to as the 2-2 hopping PRB index) for frequency hopping within the PUCCH resource configuration configured by the RRC in an existing legacy NR system, separate from the existing second hopping PRB index (hereinafter referred to as the 2-1 hopping PRB index). That is, the terminal may further configure the 2-2 hopping PRB index for SBFD operation such that when frequency hopping is configured for an SBFD slot / symbol, the location of the frequency hop where PUCCH transmission takes place is located in the uplink subband transmission area. The terminal may be instructed by the base station to select one of the PUCCH resources via DCI. In this case, the terminal can determine the location of each frequency hop where PUCCH transmission takes place based on the hopping PRB index in 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 2-2 hopping PRB index further configured for frequency hopping within 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 a PUCCH by applying the 2-1 hopping PRB index. According to the first embodiment, in a non-SBFD slot / symbol, the frequency hop position can be set in the same way as in a legacy NR system using the 2-1 hopping PRB index, and in an SBFD slot / symbol, the frequency hop may be positioned over the uplink subband transmission area using the 2-2 hopping PRB index for SBFD operation.

[0252] As described above, the terminal may have a separate second-hop PRB set configured by the base station for the SBFD slot / symbol. Since the base station instructs the terminal to use one of the configured PUCCH resources using DCI, the terminal may be instructed to transmit the first PUCCH transmission, at least the first hop transmitted, with a PRB included in the uplink subband. Therefore, the terminal may have a separate PRB set for the second hop of the PUCCH transmitted from the base station in the uplink subband. That is, for the same PUCCH resource configuration, the terminal may have different values ​​configured for the second-hop information for SBFD slot / symbols and non-SBFD slot / symbols. For example, referring to Figure 23, the terminal may have a PUCCH resource with PUCCH resource index (pucch-ResourceId) 0 configured by the base station in the RRC. In this case, the terminal may configure secondHopPRB=20 as the 2-1 hopping PRB index and secondHopPRB-r18 for SBFD=10 as the 2-2 hopping PRB index. When the transmission of the second hop is performed in an SBFD slot / symbol, the terminal can determine the frequency position of the second hop (e.g., PRB set) by applying the 2-2 hopping PRB index, i.e., secondHopPRB-r18 for SBFD=10, from the configuration of the PUCCH resource and transmit a PUCCH. On the other hand, when the transmission of the second hop is performed in a non-SBFD slot / symbol, the terminal can determine the frequency position of the second hop using the 2-1 hopping PRB index, i.e., secondHopPRB=20, as in the existing legacy NR system, and transmit a PUCCH.

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

[0254] Second Embodiment: The terminal may have a second PUCCH resource configured by the base station via RRC, separately from the first PUCCH resource configuration configured by the RRC in the existing legacy NR system, for the purpose of configuring PUCCH resources for SBFD operation. For example, when a PUCCH is transmitted using frequency hopping in an SBFD slot / symbol, the second PUCCH resource for SBFD operation may be configured such that the position of each frequency hop in which the PUCCH transmission takes place is located in the uplink subband transmission area. The terminal can be instructed by the DCI to use one of the second PUCCH resources from the base station and transmit using that PUCCH resource. On the other hand, in the case of a non-SBFD slot / symbol, the terminal can be instructed by the DCI to use one of the first PUCCH resources, just as in the legacy NR system, and transmit using that PUCCH resource.

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

[0256] In the second embodiment described above, when a terminal is configured with another second PUCCH resource from the base station, the terminal can determine which of the first and second PUCCH resources to apply a single PUCCH resource indicated by DCI (e.g., PRI in DCI) to, depending on whether the slot / symbol instructed to transmit a PUCCH in 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 described above.

[0258] [Table 9]

[0259] Furthermore, the problem that this invention aims to solve concerns a method for determining the PRB set for hop 0 (hereinafter referred to as PBR set #0) and the PRB set for hop 1 (hereinafter referred to as PBR set #1) when a terminal transmits a PUCCH by frequency hopping in an SBFD slot / symbol before RRC linking during the initial cell connection process.

[0260] More specifically, this concerns how to assign different hops within the uplink subband, i.e., a PRB set for hop 0 and a PRB set for hop 1, when transmitting a PUCCH by frequency hopping before RRC concatenation in an SBFD slot / symbol.

[0261] When a terminal sends a PUCCH before RRC connection, it selects / determines one of 16 PUCCH resources based on the PRI included in the DCI format that schedules the PUCCH as described above and the index of the CCE that received the DCI format.

[0262] For example, referring to Figure 25, the terminal can determine the PUCCH resource index to be 6 based on the PRI and CCE index (i.e., RB offsetBWP =4, r PUCCH =67N CS =4). Also, the terminal is N size BWP =30, N size UL =10 may be set or instructed. That is, the terminal may be set or instructed to have 30 PRBs (PRB#0~29) for the initial UL BWP, and 10 (PRB#8~17) for the number of PRBs (PRBs) of the initial UL BWP that can be used for uplink transmission in that slot / symbol. In this case, when the terminal determines the frequency hop by the existing method described above, the PRB index for hop 0 is

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[0263] The following describes embodiments for solving the above problem.

[0264] First embodiment: The terminal has a PRB index of hop 0.

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[0265] Specifically, r PUCCH If it is one of the values ​​0, 1, ..., 7, then the PRB index of hop 0 of the PUCCH resource is

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

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[0267] Referring to Figure 28, the terminal may be configured or instructed to use a small PRB uplink subband during initial cell connection (N size BWP =20, N size UL =5). At this time, the PRB offset in Table 6 (i.e., RB offsetBWP When determining the PRB for frequency hopping based on ), the PRB index may exclude PRBs available for uplink transmission. In Figure 28, when determining the PRB for frequency hopping according to the first embodiment, the PRB index for hop 0 is

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[0268] Second embodiment: The terminal has a PRB index of hop 0.

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

number

number

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[0270] For example, referring to Figure 28, the terminal can determine the PUCCH resource index to be 6 based on the PRI and CCE index (i.e., RB offsetBWP =4, r PUCCH =67N CS =4). Also, the terminal is N size BWP =20, N size UL It may be set or instructed as =5. According to the second embodiment, the terminal's PRB index for hop 0 is

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

[0272] Third embodiment: The terminal has a PRB index of hop 0.

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[0273] Specifically, r PUCCH If it is one of the values ​​0, 1, ..., 7, then the PRB index of hop 0 of the PUCCH resource is

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[0274] According to the third embodiment, the terminal can separately determine an offset for frequency hopping in the slot / symbol for which the uplink is set or indicated. The offset may be determined based on information separately received from the base station, or it may be information contained in another table for the terminal to determine the PUCCH resource before RRC coupling. That is, the terminal, r PUCCH This can be analyzed as an index applied to a new table, rather than Table 6.

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

[0276] Referring to Figure 29, the terminal receives control information for transmitting PUSCH, and the control information may include FDRA information (S2902). The terminal can then transmit PUSCH with a first RB set corresponding to the first hop in the UL BWP (S2904). Here, the first RB set may be determined based on the FDRA information. The terminal can also transmit PUSCH with a second RB set corresponding to the second hop in the UL BWP (S2906). Here, if the second hop belongs to the SBFD symbol set in the time domain, the second RB set may be determined based on a value that satisfies the following mathematical formula 1: Mathematical formula 1: M mod N size UL +RB start,UL Here, - M is (RB start +RB offset ) represents the value obtained based on RB start This represents the starting RB index of the first RB set, and RB offset is 0 to N size BWP Represents an offset that has one of the values ​​of -1, N size BWP This represents the number of RBs in the aforementioned UL BWP, - N size UL This represents the number of RBs in the UL subband within the SBFD symbol set, - RB start,UL This 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.

[0277] Here, if 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 that satisfies the following mathematical formula 2: Mathematical formula 2: (RB start +RB offset ) mod N size BWP Here, M is (RB start +RB offset -RB start,UL ) may be included.

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

[0279] Here, 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 a non-SBFD symbol set in the time domain.

[0280] Although the methods and systems of the present invention have been described in relation to specific embodiments, some or all of their components or operations may be embodied by computing systems having a general-purpose hardware architecture.

[0281] The above description of the present invention is illustrative, and a person with ordinary skill in the art to which the present invention pertains will understand that it can be easily modified into other specific forms without altering the technical idea or essential features of the present invention. Accordingly, the embodiments described above should be understood in all respects as illustrative and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0282] The scope of the present invention is defined more by the attached claims than by the above detailed description, and any modified or altered forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included within the scope of the present invention.

[0283] The scope of the present invention is defined more by the attached claims than by the above detailed description, and any modified or altered forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included within the scope of the present invention. [Explanation of Symbols]

[0284] UE terminal BS base station

Claims

1. A terminal configured to operate in a wireless communication system, Communication module and A processor that controls the communication module, The aforementioned processor, The system receives control information for transmitting PUSCH (physical uplink shared channel), and the control information includes FDRA (frequency domain resource assignment) information. The PUSCH is transmitted in a first RB (resource block) set corresponding to the first hop in the UL (uplink) BWP (bandwidth part), and the first RB set is determined based on the FDRA information. The PUSCH is transmitted with a second RB set corresponding to the second hop in the UL BWP, and if the second hop belongs to the SBFD (subband non-overlapping full duplex) symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 1, and the second RB set is determined based on the FDRA information. Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ +RB ｓｔａｒｔ，ＵＬ Here - M represents a value obtained based on (RB ｓｔａｒｔ + RB ｏｆｆｓｅｔ - RB start, UL), 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 This represents the number of RBs in the UL subband within the aforementioned SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ This 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. If the second hop belongs to a non-SBFD symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 2: Mathematical formula 2: (RB) ｓｔａｒｔ +RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The terminal according to claim 1.

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

4. The terminal according to claim 1, 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 a non-SBFD symbol set in the time domain.

5. A method performed by a terminal configured to operate in a wireless communication system, A step of receiving control information for transmitting PUSCH (physical uplink shared channel), wherein the control information includes FDRA (frequency domain resource assignment) information, The step of transmitting the PUSCH using a first RB (resource block) set corresponding to the first hop in the UL (uplink) BWP (bandwidth part), wherein the first RB set is determined based on the FDRA information, The process includes the step of transmitting the PUSCH with a second RB set corresponding to a second hop in the UL BWP, wherein if the second hop belongs to the SBFD (subband non-overlapping full duplex) symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 1, and the second RB set is determined based on the FDRA information. Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ +RB ｓｔａｒｔ，ＵＬ Here, - M is (RB ｓｔａｒｔ +RB ｏｆｆｓｅｔ - This represents the value obtained based on RB start, UL, and RB ｓｔａｒｔ This represents the starting RB index of the first RB set, and RB ｏｆｆｓｅｔ is 0 to N ｓｉｚｅ ＢＷＰ Represents an offset having one of the values ​​of -1, N ｓｉｚｅ ＢＷＰ This represents the number of RBs in the UL BWP, - N ｓｉｚｅ ＵＬ This represents the number of RBs in the UL subband within the aforementioned SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ A method for representing 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.

6. If the second hop belongs to a non-SBFD symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 2: Mathematical formula 2: (RB) ｓｔａｒｔ +RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The method according to claim 5.

7. The method according to claim 5, wherein the SBFD symbol set includes a DL subband and an UL subband that are FDM (frequency division multiplexed) in the frequency domain, and the RB having the lowest index in the UL subband is located within the UL BWP.

8. The method according to claim 5, 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 a non-SBFD symbol set in the time domain.

9. A base station configured to operate in a wireless communication system, Communication module and A processor that controls the communication module, The aforementioned processor, It transmits control information for receiving PUSCH (physical uplink shared channel), and the control information includes FDRA (frequency domain resource assignment) information. The PUSCH is received by the first RB (resource block) set corresponding to the first hop in the UL (uplink) BWP (bandwidth part), and the first RB set is determined based on the FDRA information. The PUSCH is received in a second RB set corresponding to the second hop in the UL BWP, and if the second hop belongs to the SBFD (subband non-overlapping full duplex) symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 1, and the second RB set is determined based on the FDRA information. Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ +RB ｓｔａｒｔ，ＵＬ Here, - M is (RB ｓｔａｒｔ +RB ｏｆｆｓｅｔ - This represents the value obtained based on RB start, UL, and RB ｓｔａｒｔ This represents the starting RB index of the first RB set, and RB ｏｆｆｓｅｔ is 0 to N ｓｉｚｅ ＢＷＰ Represents an offset having one of the values ​​of -1, N ｓｉｚｅ ＢＷＰ This represents the number of RBs in the UL BWP, - N ｓｉｚｅ ＵＬ This represents the number of RBs in the UL subband within the aforementioned SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ A base station, where 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.

10. If the second hop belongs to a non-SBFD symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 2: Mathematical formula 2: (RB) ｓｔａｒｔ +RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The base station according to claim 9.

11. The base station according to claim 9, wherein the SBFD symbol set includes a DL subband and an UL subband that are FDM (frequency division multiplexed) in the frequency domain, and the RB having the lowest index in the UL subband is located within the UL BWP.

12. The base station according to claim 9, 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 a non-SBFD symbol set in the time domain.

13. A method performed by a base station configured to operate in a wireless communication system, A step of transmitting control information for receiving PUSCH (physical uplink shared channel), wherein the control information includes FDRA (frequency domain resource assignment) information. The step of receiving the PUSCH in a first RB (resource block) set corresponding to the first hop in the UL (uplink) BWP (bandwidth part), wherein the first RB set is determined based on the FDRA information, The process includes the step of receiving the PUSCH in a second RB set corresponding to a second hop in the UL BWP, wherein if the second hop belongs to an SBFD (subband non-overlapping full duplex) symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 1, and the second RB set is determined based on the FDRA information. Mathematical formula 1: M mod N ｓｉｚｅ ＵＬ +RB ｓｔａｒｔ，ＵＬ Here, - M is (RB ｓｔａｒｔ +RB ｏｆｆｓｅｔ - This represents the value obtained based on RB start, UL, and RB ｓｔａｒｔ This represents the starting RB index of the first RB set, and RB ｏｆｆｓｅｔ is 0 to N ｓｉｚｅ ＢＷＰ Represents an offset having one of the values ​​of -1, N ｓｉｚｅ ＢＷＰ This represents the number of RBs in the UL BWP, - N ｓｉｚｅ ＵＬ This represents the number of RBs in the UL subband within the aforementioned SBFD symbol set, - RB ｓｔａｒｔ，ＵＬ A method for representing 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.

14. If the second hop belongs to a non-SBFD symbol set in the time domain, the starting RB of the second RB set is determined based on a value that satisfies the following mathematical formula 2: Mathematical formula 2: (RB) ｓｔａｒｔ +RB ｏｆｆｓｅｔ ) mod N ｓｉｚｅ ＢＷＰ The method according to claim 13.

15. The method according to claim 13, wherein the SBFD symbol set includes a DL subband and an UL subband that are FDM (frequency division multiplexed) in the frequency domain, and the RB having the lowest index in the UL subband is located within the UL BWP.

16. The method according to claim 13, 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 a non-SBFD symbol set in the time domain.

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