Channel multiplexing method and multiplexed channel transmission method for wireless communication systems, and devices using the same.

Abstract

We will disclose the base station of the wireless communication system. [Solution] A base station for wireless communications includes a communications module and a processor configured to control the communications module. When a second physical uplink data channel transmission of the UE is scheduled to occur on a time-frequency resource on which the uplink control information (UCI) transmission of the UE's first physical uplink data channel is scheduled, the processor is configured to transmit the UCI to the base station of the wireless communications system on a time-frequency resource other than the time-frequency resource on which the second physical uplink data channel transmission of the UE is scheduled.

Description

Technical Field

[0001] The present invention relates to a wireless communication system. More specifically, the present invention relates to a channel multiplexing method for a wireless communication system, a multiplexed channel transmission method, and a device using them.

Background Art

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

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

[0004] For more efficient data processing, the dynamic TDD of 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] In order to mitigate path loss and extend the transmission distance of radio waves in the mmWave band, 5G communication systems will explore technologies such as beamforming, massive multi-input / output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming (combining analog and digital beamforming), and large-scale antenna technology. In addition, to improve the network of the system, 5G communication systems will see the development of technologies related to advanced small cells, high-speed small cells, cloud radio access networks (cloud RAN), ultra-high-density networks, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), mobile networks, collaborative communication, coordinated multi-points (CoMP), and interference cancellation. In addition, 5G systems are currently under development for advanced coding modulation (ACM) techniques such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced connectivity technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA).

[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. 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 high-speed data services are available. 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 Initiative] [Problems that the invention aims to solve]

[0009] An object of one embodiment of the present invention is to provide a method and device for efficiently transmitting signals in a wireless communication system. In addition, an object of one embodiment of the present invention is to provide a channel multiplexing method, a multiplexed channel transmission method, and a device using the same in a wireless communication system. [Means for solving the problem]

[0010] According to one embodiment of the present invention, a UE of a wireless communication system includes a communication module and a processor configured to control the communication module. When a second physical uplink data channel transmission of the UE is scheduled to occur on a time-frequency resource on which uplink control information (UCI) transmission of the UE's first physical uplink data channel is scheduled, the processor is configured to transmit the UCI to the base station of the wireless communication system on a time-frequency resource other than the time-frequency resource on which the second physical uplink data channel transmission of the UE is scheduled.

[0011] The processor may be configured to determine whether to send a UCI according to the type of UCI.

[0012] The processor may transmit a UCI when the type of the UCI is a hybrid automatic repeat request (HARQ)-ACK, and may be configured to omit the transmission of a UCI when the type of the UCI is channel state information part 1 or CSI part 2.

[0013] The processor may be configured to transmit a UCI when the UCI type is HARQ-ACK or CSI part 1, and to omit the transmission of a UCI when the UCI type is CSI part 2.

[0014] According to one embodiment of the present invention, a UE of a wireless communication system includes a communication module and a processor configured to control the communication module. When a physical uplink data channel transmission of the UE is scheduled within the time-frequency resources in which a physical uplink control channel transmission of the UE is scheduled, the processor is configured to transmit uplink control information (UCI) of the physical uplink control channel to the base station of the wireless communication system. When a physical uplink data channel transmission of the UE is scheduled within the time-frequency resources in which a physical uplink control channel transmission of the UE is scheduled, the processor is configured to determine whether to transmit the UCI according to the type of UCI.

[0015] The processor may be configured to transmit a UCI when the UCI type is HARQ-ACK, and may be configured not to transmit a UCI when the UCI type is not HARQ-ACK.

[0016] When a UE's physical uplink data channel transmission is scheduled within the time-frequency resources in which the UE's physical uplink control channel transmission is scheduled, the processor may be configured to transmit the physical uplink control channel by puncturing the time resources within the time-frequency resources in which the UE's physical uplink control channel transmission is scheduled that overlap with the time resources in which the UE's physical uplink data channel transmission is scheduled.

[0017] When a UE's physical uplink data channel transmission is scheduled within the time-frequency resource in which the UE's physical uplink control channel transmission is scheduled, the processor may be configured to transmit the physical uplink data channel by puncturing the UE's physical uplink data channel, which is scheduled within the time-frequency resource in which the UE's physical uplink control channel transmission is scheduled.

[0018] The processor may be configured to transmit the UCI of the physical uplink control channel among N symbols following the time-frequency resources transmitted therein by the physical uplink data channel, where N may be a natural number.

[0019] According to one embodiment of the present invention, a UE of a wireless communication system includes a communication module and a processor configured to control the communication module, wherein when the transmission of a first physical uplink control channel and a second physical uplink control channel of the UE are scheduled within a single symbol, the processor is configured to transmit the first physical uplink control channel within the time-frequency resource on which the first physical uplink control channel is scheduled, and to transmit the second physical uplink control channel within another time-frequency resource that does not overlap with the time-frequency resource on which the first physical uplink control channel is scheduled.

[0020] The processor may be configured to select another time-frequency resource from among multiple time-frequency resources based on the position in the slot of the last symbol of each of the multiple time-frequency resources configured for transmission of the physical uplink control channel.

[0021] The processor may be configured to select another time-frequency resource by considering the position of the last symbol of each of the multiple time-frequency resources, and then considering the number of symbols of each of the multiple time-frequency resources.

[0022] The processor may be configured to select as another time-frequency resource a time-frequency resource that has the same or earlier final symbol as the most recent symbol among the time-frequency resources on which the transmission of the first physical uplink control channel is scheduled and among the time-frequency resources on which the transmission of the second physical uplink control channel is scheduled.

[0023] Based on the fact that downlink control information (DCI) indicates a transmission of at least one of two physical uplink control channels, including a first physical uplink control channel and a second physical uplink control channel, the processor may be configured to determine which of the two physical uplink control channels is the first physical uplink control channel and which is the second physical uplink control channel.

[0024] The processor may be configured to determine the first and second physical uplink control channels of two physical uplink control channels based on the type of uplink control information (UCI) for each of the two physical uplink control channels.

[0025] The processor may be configured to determine, as the first physical uplink control channel, one of two physical uplink control channels whose UCI type is Hybrid Auto Request (HARQ)-ACK, and as the second physical uplink control channel, one of two physical uplink control channels whose UCI type is Channel State Information (CSI).

[0026] According to one embodiment of the present invention, a UE of a wireless communication system includes a communication module and a processor configured to control the communication module, wherein when a permission-based physical uplink data channel transmission by the UE is scheduled within a time-frequency resource in which an unpermissioned physical uplink data channel transmission by the UE is scheduled, and there is data to be transmitted through the unpermissioned physical uplink data channel, the processor is configured to skip the permission-based physical uplink data channel transmission and transmit the unpermissioned physical uplink data channel.

[0027] When a permission-based physical uplink data channel transmission is omitted and an unauthorized physical uplink data channel is transmitted, the processor may be configured to transmit uplink control information (UCI) that should be transmitted through the permission-based physical uplink data channel through the unauthorized physical uplink data channel.

[0028] When there is data to be transmitted through an unauthorized physical uplink data channel, and the transmission period of the unauthorized physical uplink data channel is shorter than a certain period, the processor may omit permission-based physical uplink data channel transmissions and transmit through the unauthorized physical uplink data channel.

[0029] According to one embodiment of the present invention, a UE operation method of a wireless communication system includes transmitting UCI to a base station of the wireless communication system in a time-frequency resource other than the time-frequency resource on which the UE's second physical uplink data channel transmission is scheduled, when the UE's second physical uplink data channel transmission is scheduled in the time-frequency resource on which the UE's first physical uplink data channel transmission of uplink control information (UCI) is scheduled.

[0030] Sending a UCI involves deciding whether or not to send a UCI based on the type of UCI.

[0031] The decision of whether or not to send a UCI includes sending the UCI when the UCI type is a Hybrid Automatic Retransmission Request (HARQ)-ACK, and omitting the transmission of the UCI when the UCI type is Channel State Information (CSI) part 1 or CSI part 2.

[0032] The decision of whether or not to send a UCI includes sending the UCI when the type of the UCI is a Hybrid Automatic Retransmission Request (HARQ)-ACK or Channel Status Information (CSI) part 1, and omitting the transmission of the UCI when the type of the UCI is CSI part 2.

[0033] According to one embodiment of the present invention, a UE operation method of a wireless communication system includes transmitting uplink control information (UCI) of a physical uplink control channel to a base station of the wireless communication system when the UE's physical uplink data channel transmission is scheduled within the time-frequency resources in which the UE's physical uplink control channel transmission is scheduled.

[0034] Transmitting a UCI to a base station of a wireless communication system involves determining, according to the type of UCI, whether the UE's physical uplink data channel transmission should be scheduled within the time-frequency resources in which the UE's physical uplink control channel transmission is scheduled.

[0035] Deciding whether to transmit a UCI according to the type of UCI includes transmitting a UCI when the type of UCI is HARQ-ACK, and not transmitting a UCI when the type of UCI is not HARQ-ACK.

[0036] The operation method may further include transmitting the physical uplink control channel by puncturing the time resources within the time-frequency resources where the UE's physical uplink control channel transmission is scheduled, which overlap with the time resources where the UE's physical uplink data channel transmission is scheduled, when the UE's physical uplink data channel transmission is scheduled.

[0037] The operation method may further include transmitting the physical uplink data channel by puncturing the physical uplink data channel of the UE, which is scheduled within the time-frequency resource in which the transmission of the physical uplink control channel is scheduled, when the transmission of the UE's physical uplink data channel is scheduled within the time-frequency resource in which the transmission of the physical uplink control channel is scheduled.

[0038] The operation method may further include transmitting the UCI of the physical uplink control channel among the N symbols following the time-frequency resource transmitted therein by the physical uplink data channel, where N may be a natural number.

[0039] According to one embodiment of the present invention, a UE operation method of a wireless communication system includes, when the transmission of a first physical uplink control channel and a second physical uplink control channel of the UE are scheduled within a single symbol, transmitting the first physical uplink control channel within a time-frequency resource on which the first physical uplink control channel is scheduled, and transmitting the second physical uplink control channel within another time-frequency resource that does not overlap with the time-frequency resource on which the first physical uplink control channel is scheduled.

[0040] Transmitting a second physical uplink control channel may involve selecting other time-frequency resources from among multiple time-frequency resources based on the position in the slot of the final symbol of each of the multiple time-frequency resources configured for transmitting the physical uplink control channel.

[0041] Selecting other time-frequency resources may involve selecting other time-frequency resources by considering the position of the final symbol of each of the multiple time-frequency resources, and then considering the number of symbols of each of the multiple time-frequency resources.

[0042] Transmitting a second physical uplink control channel may include selecting as another time-frequency resource a time-frequency resource that has the same or earlier final symbol as the most recent symbol among the time-frequency resources where the first physical uplink control channel is scheduled to be transmitted and among the time-frequency resources where the second physical uplink control channel is scheduled to be transmitted.

[0043] Transmitting a second physical uplink control channel may involve determining the first and second physical uplink control channels among two physical uplink control channels, based on the fact that the downlink control information (DCI) indicates the transmission of at least one of two physical uplink control channels, including the first and second physical uplink control channels.

[0044] Determining a first physical uplink control channel and a second physical uplink control channel may include determining the first and second physical uplink control channels from among the two physical uplink control channels based on the type of uplink control information (UCI) for each of the two physical uplink control channels.

[0045] Determining the first and second physical uplink control channels of two physical uplink control channels based on the UCI type may include determining the physical uplink control channel whose UCI type is HARQ-ACK as the first physical uplink control channel, and determining the physical uplink control channel whose UCI type is CSI as the second physical uplink control channel.

[0046] According to one embodiment of the present invention, a UE operation method of a wireless communication system includes, when a permission-based physical uplink data channel transmission by the UE is scheduled within a time-frequency resource in which an unpermitted physical uplink data channel transmission by the UE is scheduled, and there is data to be transmitted through the unpermitted physical uplink data channel, the UE omits the permission-based physical uplink data channel transmission and transmits the unpermitted physical uplink data channel.

[0047] Transmitting an authorization-based physical uplink data channel while omitting an authorization-based physical uplink data channel transmission may include, when omitting an authorization-based physical uplink data channel transmission and transmitting an authorization-based physical uplink data channel, transmitting uplink control information (UCI) that should be transmitted through the authorization-based physical uplink data channel through the authorization-based physical uplink data channel.

[0048] Transmitting an authorization-based physical uplink data channel transmission while simultaneously transmitting an unauthorized physical uplink data channel may include, when there is data to be transmitted through the unauthorized physical uplink data channel and the transmission period of the unauthorized physical uplink data channel is shorter than a certain period. [Effects of the Invention]

[0049] One embodiment of the present invention provides a method for efficiently multiplexing channels in a wireless communication system, a method for receiving multiplexed channels, and a device for using them.

[0050] The effects that can be obtained from the various embodiments of this disclosure are not limited to those described above, and other effects not described above can be clearly derived from the following description and will be understood by those skilled in the art. [Brief explanation of the drawing]

[0051] [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 4] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5] 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 block diagram shows the configuration of a UE and a base station according to one embodiment of the present disclosure. [Figure 12] This figure shows a look-ahead indicator used in a wireless communication system according to one embodiment of the present invention. [Figure 13] This figure shows the range of the physical uplink data channel that a UE cannot transmit due to preemption, according to one embodiment of the present invention. [Figure 14] This diagram shows the operation in which a UE sends a PUSCH that could not be sent due to preemption, according to one embodiment of the present invention. [Figure 15] This figure shows the range of the physical uplink data channel that a UE cannot transmit due to preemption, according to another embodiment of the present invention. [Figure 16] This figure shows the operation in which a UE transmits DMRS and UCI that could not be transmitted due to preemption, according to one embodiment of the present invention. [Figure 17] This figure shows a method for a UE to select an alternative physical uplink control channel according to one embodiment of the present invention. [Modes for carrying out the invention]

[0052] 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.

[0053] 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.

[0054] 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 (E-UMTS), 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.

[0055] Unless otherwise specified in this specification, a base station may include a next-generation node B (gNB) defined in 3GPP NR. Further, unless otherwise specified, a terminal may include a user equipment (UE). In the following, for the sake of helping the understanding of the description, each content will be separately described by embodiments, but each embodiment may be used in combination with each other. In this specification, the configuration of the UE may indicate the configuration by the base station. More specifically, the base station may configure the value of a parameter used in the operation of the UE or the wireless communication system by transmitting a channel or a signal to the UE.

[0056] FIG. 1 shows an example of a wireless frame structure used in a wireless communication system.

[0057] Referring to FIG. 1, a wireless frame (or radio frame) used in a 3GPP NR system may have a length of 10 ms (Δf max N f / 100)*T c ). In addition, the wireless frame includes 10 subframes (SF: subframe) of equal size. In this specification, Δf max = 480*10 3 Hz, N f = 4096, T c = 1 / (Δf ref *N f,ref ), Δf ref = 15*10 3 Hz, and N f,ref = 2048. Numbers from 0 to 9 may be respectively assigned to the 10 subframes within one wireless frame. Each subframe has a length of 1 ms and may include one or more slots according to the subcarrier spacing. More specifically, in the 3GPP NR system, the subcarrier spacing that can be used is 15*2 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 wireless frame μ Each slot has 0 to 2 μ Numbers up to -1 may be assigned. In addition, each slot within a subframe 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).

[0058] Figure 2 shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. Specifically, Figure 2 shows the resource grid structure of a 3GPP NR system.

[0059] 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 containing n OFDM symbols, where x=DL when the signal is a DL signal and x=UL when the signal is a UL signal. size,μ grid,x This represents the number of resource blocks (RBs) according to the subcarrier interval, which is a component of μ (where x is DL or UL), and N slot symb This represents the number of OFDM symbols in the slot. RB sc N is the number of subcarriers that make up one RB. RB sc = 12. OFDM symbols are sometimes called cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols, depending on the multiple access scheme.

[0060] The number of OFDM symbols contained in a single slot may vary depending on the length of the cyclic prefix (CP). For example, with a normal CP, a single slot may contain 14 OFDM symbols, while with an extended CP, a single slot may contain 12 OFDM symbols. In certain embodiments, the extended CP may be used only at a 60 kHz subcarrier interval. In Figure 2, for illustrative purposes, a single slot is configured using 14 OFDM symbols as an example, but embodiments of this disclosure may similarly apply to slots with different numbers of OFDM symbols. Referring to Figure 2, each OFDM symbol has N in the frequency domain. size,μ grid,x *N RB sc This includes subcarriers. Subcarrier types 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).

[0061] One RB is N in the frequency domain. RB sc (For example, 12) may 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 between 0 and N in the time domain. slot symb It can be an index that can be assigned up to -1.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] When information about symbol types is configured using UE-specific RRC signals, the base station can signal whether the flexible symbol is a DL symbol or a UL symbol in the cell-specific RRC signal. 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.

[0066] The type of symbol configured using the above RRC signal is sometimes called a semi-static DL / UL configuration. In the semi-static DL / UL configuration previously configured using the RRC signal, the flexible symbol can be indicated as a DL symbol, a UL symbol, or a flexible symbol through the dynamic slot format information (SFI: slot format information) transmitted on the physical DL control channel (PDCCH: physical DL control channel). In this case, the DL symbol or UL symbol configured using the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI that the base station can show to the UE.

[0067]

Table 1

[0068] In Table 1, D represents a DL symbol, U represents a UL symbol, and X represents a flexible symbol. As shown in Table 1, a maximum of two DL / UL switches may be allowed within a single slot.

[0069] Figure 3 illustrates the physical channels used in a 3GPP system (e.g., NR) and a typical signal transmission method using these physical channels.

[0070] When the UE is powered on or camp-on to a new cell, the UE performs an initial cell discovery (S101). Specifically, the UE may synchronize with the base station (BS) during the initial cell discovery. To this end, the UE may receive primary synchronization signals (PSS) and secondary synchronization signals (SSS) from the base station to synchronize with the base station and obtain information such as the cell ID. Subsequently, the UE may receive physical broadcast channels from the base station and obtain broadcast information in the cell.

[0071] 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, and as a result, the UE can obtain more specific system information than the system information obtained through the initial cell discovery (S102). In this specification, the system information received by the UE is cell-common system information for the normal operation of the UE in the physical layer of radio resource control (RRC), and is referred to as remaining system information or system information block (SIB) 1.

[0072] When a UE first accesses a base station or does not have radio resources for signal transmission (i.e., a UE in RRC_IDLE mode), the UE may perform a random access procedure to the base station (operations S103-S106). First, the UE may transmit a preamble through a physical random access channel (PRACH) (S103), and receive a response message for the preamble from the base station through the PDCCH and the corresponding PDSCH (S104). Once the UE receives a valid random access response message, the UE transmits data to the base station, including the UE's identifier, through a physical uplink shared channel (PUSCH) indicated by a UL authorization transmitted from the base station via the PDCCH (S105). Next, the UE waits to receive the PDCCH as an indication from the base station for collision resolution. If the UE successfully receives the PDCCH with the UE's identifier (S106), the random access process is terminated. During the random access process, the UE may obtain UE-specific system information for normal operation within the physical layer at the RRC layer. Once the UE obtains this UE-specific system information, it enters RRC connected mode (RRC_CONNECTED mode).

[0073] The RRC layer is used to generate or manage messages to control the connection between the UE and the radio access network (RAN). More specifically, base stations and UEs may perform memory management at the RRC layer, including broadcasting cell system information required by all UEs in the cell, managing mobility and handovers, UE measurement reporting, UE capability management, and device management. Generally, because the update period of signals delivered at the RRC layer is longer than the transmission time interval (TTI) at the physical layer, RRC signals remain unchanged for very long periods.

[0074] 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 status 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.

[0075] Figure 4 shows the SS / PBCH block for initial cell access in a 3GPP NR system.

[0076] 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 ID This 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).

[0077] The synchronization signal (SS) will be explained in more detail with reference to Figure 4(a). Synchronization signals can be classified into PSS and SSS. PSS can be used to obtain time-domain synchronization and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. SSS can be used to obtain frame synchronization and cell group ID. Referring to Figure 4(a) and Table 2, 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 starting 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.

[0078] [Table 2]

[0079] 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 cellID =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:

[0080]

number

[0081] Here, x(i+7)=(x(i+4)+x(i)) mod 2, and it is given as [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

[0082] Furthermore, the SSS series d SSS (n) is as follows:

[0083]

number

[0084] Here, x0(i+7)=(x0(i+4)+x0(i)) mod 2 x1(i+7)=(x1(i+1)+x1(i)) mod 2 And, [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)]=[0 0 0 0 0 0 1] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)]=[0 0 0 0 0 0 1] It is given as follows.

[0085] 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 4(b), 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 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.

[0086] Figure 5 shows the procedure for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5(a), 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 5(b) 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.

[0087] Figure 6 shows the set of control resources (core set) that a physical downlink control channel (PDCCH) can transmit within in a 3GPP NR system.

[0088] 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 single 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 5, 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.

[0089] Figure 7 shows a method for setting up the PUCCH search space in the 3GPP NR system.

[0090] 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 a 3GPP NR are required to search in common, and UE-specific or UE-individual 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 be partially overlapping or 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 can be said that the PDCCH is (successfully) detected / received, and when blind decoding fails, it can be said that the PDCCH is not detected / received, or is not successfully detected / received.

[0091] 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.

[0092] 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.

[0093] A base station may include information in a PDCCH about which UE(s) the PDSCH data is being transmitted to, and how the corresponding UE will receive and decode the PDSCH data, and may transmit that 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".

[0094] Table 3 shows one embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0095] [Table 3]

[0096] PUCCH can be used to transmit the following UL control information (UCI):

[0097] - Scheduling Request (SR): Information used to request UL-SCH resources.

[0098] - 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.

[0099] - Channel Status 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.

[0100] The 3GPP NR system may use five PUCCH formats to support various service scenarios, channel environments, and frame structures.

[0101] PUCCH format 0 is a format capable of delivering 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on the time axis and one PRB on the frequency axis. When PUCCH format 0 is transmitted 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 basic sequence used in PUCCH format 0. Through this, the UE may obtain frequency diversity gain. More specifically, the UE can, bit Bit UCI(M bit The cyclic shift (CS) value m is determined according to (=1 or 2). cs This can be determined. In addition, a predetermined CS value m cs A cyclic shifted sequence based on this can be mapped to one OFDM symbol in one RB and 12 REs, thereby transmitting a basic sequence of length 12. The number of cyclic shifts available to the UE is 12, and M bit When = 1, 1-bit UCI 0 and 1 can be mapped to two cyclically shifted sequences, respectively, where the difference in cyclically shifted values ​​is 6. In addition, M bit When = 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.

[0102] PUCCH format 1 can deliver 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 can be transmitted through a sequence of OFDM symbols on the time axis and one PRB on the frequency axis, where the number of OFDM symbols occupied by PUCCH format 1 may be one of 4 to 14. More specifically, M bit UCI, where = 1, may be modulated using BPSK. UE is M bitA UCI with =2 may be modulated using 4-phase shift keying (QPSK). The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a sequence of length 12. In this case, the sequence may be the basic sequence used for PUCCH format 0. The UE transmits the obtained signal by spreading the even-numbered OFDM symbols to which PUCCH format 1 assigns through an orthogonal cover code (OCC). PUCCH format 1 determines the maximum number of different UEs multiplexed in one RB, according to the length of the OCC to be used. A demodulation reference signal (DMRS) may be spread using OCC and may be mapped to the odd-numbered OFDM symbols of PUCCH format 1.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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 ceiling(N / 2) OFDM symbols.

[0107] 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.

[0108] On the other hand, in a 3GPP NR system, a UE may transmit / receive using a bandwidth equal to or smaller than the carrier (or cell) bandwidth. For this reason, a UE may receive a bandwidth part (BWP) composed of several continuous bandwidths of the carrier bandwidth. A UE operating according to TDD or in an unpaired spectrum can receive up to four DL / UL BWP pairs within a single carrier (or cell). In addition, a UE may activate one DL / UL BWP pair. A UE operating according to FDD or in a paired spectrum can receive up to four DL BWPs on a DL carrier (or cell) and up to four UL BWPs on a UL carrier (or cell). A UE may activate one DL BWP and one UL BWP per carrier (or cell). A UE does not have to receive or transmit in time-frequency resources other than the activated BWPs. Activated BWPs are sometimes called active BWPs.

[0109] A base station may indicate, through Downlink Control Information (DCI), which BWPs configured by the UE are activated. The BWP indicated through the DCI is activated, and the other configured BWPs are deactivated. For carriers (or cells) operating in TDD, the base station may include a bandwidth part indicator (BPI) in the DCI for scheduling a PDSCH or PUSCH that indicates the BWP to be activated to change the UE's DL / UL BWP pair. The UE may receive the DCI for scheduling a PDSCH or PUSCH and identify the activated DL / UL BWP pair based on the BPI. For DL ​​carriers (or cells) operating in FDD, the base station may include a BPI indicating the BWP to be activated in the DCI for scheduling a PDSCH to change the UE's DL BWP. For UL carriers (or cells) operating in FDD, the base station may include a BPI indicating the BWP to be activated in the DCI for scheduling a PUSCH to change the UE's UL BWP.

[0110] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0111] Carrier aggregation is a method by which a wireless communication system uses a wider frequency band by allowing a UE (Unified Element) to use 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.

[0112] 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.

[0113] 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.

[0114] When the entire system bandwidth is extended by carrier aggregation, the frequency bandwidth used for communication with each UE may 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 two component carriers may or may not be logically / physically adjacent. UE C1 represents the case where two non-adjacent component carriers are used, and UE C2 represents the case where two adjacent component carriers are used.

[0115] 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.

[0116] 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.

[0117] 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).

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] Figure 11 is a block diagram showing the configuration of a UE and a base station according to one embodiment of the present disclosure. In one embodiment of the present disclosure, the UE may be implemented in various types of wireless communication or computing devices that are guaranteed to be portable and mobile. The UE may be referred to as a user device (UE), station (STA), mobile subscriber (MS), etc. In addition, in one embodiment of the present disclosure, the base station controls and manages cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to the service area and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may be referred to as a next-generation node B (gNB) or access point (AP).

[0124] As shown in the drawings, a UE100 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.

[0125] First, the processor 110 can execute various instructions or programs and process data within the UE 100. In addition, the processor 110 can control the overall operation, including each unit of the UE 100, and can control the transmission / reception of data between units. Here, the processor 110 may be configured to perform operations according to embodiments described in this disclosure. For example, the processor 110 may receive slot configuration information, determine a slot configuration based on the slot configuration information, and perform communication according to the determined slot configuration.

[0126] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, the communication module 120 may include multiple network interface cards (NICs), such as cellular communication interface cards 121 and 122 and an unlicensed bandwidth communication interface card 123, either internally or externally. In the drawings, the communication module 120 is shown as a single integrated module, but contrary to the drawings, each network interface card may be configured independently according to the circuit configuration or circuit usage.

[0127] The cellular communication interface card 121 can transmit or receive radio signals with at least one of the base station 200, external devices, and servers by using a mobile communication network, and can 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 below 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, external devices, and servers in accordance with a cellular communication standard or protocol in a frequency band below 6 GHz supported by the corresponding NIC module.

[0128] The cellular communication interface card 122 can transmit or receive radio signals with at least one of the base station 200, external devices, and servers by using a mobile communication network, and can provide cellular communication services in a second frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 122 may include at least one NIC module that uses a frequency band above 6 GHz. 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, external devices, and servers in accordance with a cellular communication standard or protocol in a frequency band of 6 GHz or higher supported by the corresponding NIC module.

[0129] The unlicensed bandwidth communication interface card 123 transmits or receives radio signals with at least one of the base station 200, external devices, and servers by using a third frequency band which is an unlicensed bandwidth, and provides unlicensed bandwidth communication services based on instructions from the processor 110. The unlicensed bandwidth communication interface card 123 may include at least one NIC module that uses an unlicensed bandwidth. For example, the unlicensed bandwidth may be a 2.4GHz or 5GHz band. At least one NIC module of the unlicensed bandwidth communication interface card 123 may independently or dependently perform wireless communication with at least one of the base station 200, external devices, and servers in accordance with an unlicensed bandwidth communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0130] Memory 130 stores control programs used in UE100 and various types of data for them. Such control programs may include predefined programs required to perform wireless communication with at least one of the base station 200, external devices, and servers.

[0131] Next, the user interface 140 includes various types of input / output means provided in the UE 100. In other words, the user interface 140 may receive user input using various input means, and the processor 110 may control the UE 100 based on the received user input. In addition, the user interface 140 may execute outputs based on instructions from the processor 110 using various types of output means.

[0132] Next, the display unit 150 outputs various images on the display screen. The display unit 150 can output various display objects, such as content executed by the processor 110 or the user interface based on control instructions from the processor 110.

[0133] In addition, a base station 200 according to one embodiment of the present disclosure may include a processor 210, a communication module 220, and a memory 230.

[0134] First, the processor 210 can execute various instructions or programs and process internal data of the base station 200. In addition, the processor 210 can control the overall operation of units within the base station 200 and control data transmission and reception between units. Here, the processor 210 may be configured to perform operations according to embodiments described in this disclosure. For example, the processor 210 may signal slot configurations and perform communications according to the signaled slot configurations.

[0135] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, the communication module 220 may include multiple network interface cards, either internally or externally, such as cellular communication interface cards 221 and 222, and an unlicensed bandwidth communication interface card 223. In the drawings, the communication module 220 is shown as a single integrated module, but contrary to the drawings, each network interface card may be configured independently according to the circuit configuration or circuit usage.

[0136] The cellular communication interface card 221 can transmit or receive radio signals with at least one of the base station 100, external devices, and servers by using a mobile communication network, and can provide cellular communication services in a first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 may include at least one NIC module that uses a frequency band below 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 base station 100, external devices, and servers in accordance with a cellular communication standard or protocol in a frequency band below 6 GHz supported by the corresponding NIC module.

[0137] The cellular communication interface card 222 can transmit or receive radio signals with at least one of the base station 100, external devices, and servers by 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 base station 100, external devices, and servers in accordance with a cellular communication standard or protocol in a frequency band of 6 GHz or higher supported by the corresponding NIC module.

[0138] The unlicensed bandwidth communication interface card 223 transmits or receives radio signals with at least one of the base station 100, external devices, and servers by using a third frequency band which is an unlicensed bandwidth, and provides unlicensed bandwidth communication services based on instructions from the processor 210. The unlicensed bandwidth communication interface card 223 may include at least one NIC module that uses an unlicensed bandwidth. For example, the unlicensed bandwidth may be a 2.4GHz or 5GHz band. At least one NIC module of the unlicensed bandwidth communication interface card 223 may independently or dependently perform wireless communication with at least one of the base station 100, external devices, and servers in accordance with an unlicensed bandwidth communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0139] Figure 11 is a block diagram showing a UE100 and a base station 200 according to one embodiment of the present disclosure, where separately illustrated blocks are logically divided elements of the device. Thus, the aforementioned elements of the device may be mounted on a single chip or multiple chips according to the device design. In addition, some components of the UE100, such as the user interface 140 and the display unit 150, may be selectively provided in the UE100. In addition, the user interface 140 and the display unit 150 may be provided in the base station 200 if necessary.

[0140] A base station may schedule a time-frequency resource scheduled for a UE's physical uplink data channel transmission for another physical uplink channel or for a physical uplink channel transmission of another UE. In addition, a base station may schedule a time-frequency resource scheduled for any one UE's physical uplink transmission for another type of physical uplink transmission to be transmitted to the corresponding UE. This scheduling of time-frequency resources for a specific purpose is called pre-emption. When a time-frequency resource scheduled for one UE's physical uplink transmission is pre-empted for another UE's physical uplink transmission, the base station may transmit an uplink (UL) pre-emption indicator to the UE indicating which time-frequency resource scheduled for the UE's uplink transmission is being pre-empted. Here, the physical uplink channel may include a physical uplink data channel or a physical uplink control channel. The pre-emption indicator will be described with reference to Figures 12–15.

[0141] Figure 12 shows a look-ahead indicator used in a wireless communication system according to one embodiment of the present invention.

[0142] The base station may configure the UE using the RRC signal to receive the UL early indicator. The base station may transmit the UL early indicator to the UE via the PDCCH. When the UE is configured through the RRC signal to receive the UL early indicator, the UE may receive the UL early indicator through the PDCCH. The UE may obtain at least one of the search space for obtaining the UL early indicator, the monitoring cycle of the UL early indicator, the value of the RNTI, and the length of the RNTI through the RRC signal. The UE may monitor the UL early indicator according to the obtained monitoring cycle of the UL early indicator. In addition, the UE may monitor the UL early indicator within the search space for obtaining the obtained UL early indicator. In addition, the UE may blindly decode the scrambled DCI according to the obtained RNTI value and the length of the RNTI. When the UE obtains the DCI scrambled using the obtained RNTI value, the UE may determine the DCI as the UL early indicator. The base station may configure one UL early indicator configuration for a plurality of UEs using the RRC signal. In this case, the PDCCH for transmitting the UL early indicator is a group common PDCCH. The base station may configure the UL early indicator for one UE using the RRC signal. In this case, the PDCCH for transmitting the UL early indicator is a UE-specific PDCCH.

[0143] The time-frequency resource indicated by the UL early indicator as to whether to take early may include all the PRBs of the UL BWP. For the sake of convenience of explanation, the time-frequency resource indicated by the UL early indicator as to whether to take early is called the reference UL time-frequency resource. When the monitoring period of the UL early indicator is T INT it may be as shown in the following formula. {mT INT +1+Δ offset ,mT INT +2+Δ offset ,...,(m + 1)T INT -Δ offset}

[0144] In this case, Δ offset This represents the offset of the time-frequency resource. Specifically, the offset of the time-frequency resource may be constructed using the RRC signal. In another specific embodiment, the offset of the time-frequency resource may be a fixed value. Alternatively, the offset of the time-frequency resource may be a multiple of the number of symbols contained in the slot. In addition, the offset of the time-frequency resource may be determined according to the UE's PUSCH processing time. The minimum time required for the UE to receive the physical downlink control channel for scheduling the transmission of the physical uplink data channel and to generate the physical uplink data channel is called Tproc. The offset of the time-frequency resource may be determined by a larger number as Tproc increases. The offset of the time-frequency resource may be a value that increases proportionally to the value of Tproc. For example, the offset of the time-frequency resource may be determined by ceil(Tproc / Symbol_duration), where Symbol_duration is the duration of the OFDM symbol. In addition, ceil(X) represents the smallest integer greater than or equal to X. In addition, the UE may determine the offset of time-frequency resources based on timing advance (TA). Specifically, the UE may determine the offset of time-frequency resources according to the time difference between the DL frame boundary and the UL frame boundary determined by the TA.

[0145] A base station may perform semi-static DL / UL assignment using a cell-specific RRC signal. The semi-static DL / UL assignment may constitute a symbol as one of uplink symbols, downlink symbols, and flexible symbols. In this case, an uplink symbol is a symbol that can be used for uplink transmission, a downlink symbol is a symbol that can be used for downlink transmission, and a flexible symbol is a symbol that can be used for uplink or downlink transmission depending on the signal. The reference UL time frequency resource does not have to include downlink symbols configured according to the semi-static DL / UL assignment. That is, the reference UL time frequency resource may include uplink symbols and flexible symbols configured according to the semi-static DL / UL assignment. In addition, the reference UL time frequency resource does not have to include flexible symbols placed immediately after downlink symbols. In this case, the number of fully flexible symbols placed immediately after downlink symbols not included in the reference UL time frequency resource may be one. In another particular embodiment, the number of flexible symbols placed immediately after downlink symbols not included in the reference UL time frequency resource may be determined by the RRC signal.

[0146] A base station may configure the reception of a downlink signal using a cell-specific RRC signal. The downlink signal may include an SS / PBCH block. The reference UL time frequency resource does not have to include symbols configured to receive the downlink signal. In addition, the reference UL time frequency resource does not have to include symbols placed immediately after symbols configured to receive the downlink signal. In this case, the number of symbols placed immediately after the symbols configured to receive the downlink signal that are not included in the reference UL time frequency resource may be one. In another particular embodiment, the number of symbols placed immediately after the symbols configured to receive the downlink signal that are not included in the reference UL time frequency resource may be comprised of an RRC signal.

[0147] The UL pre-emption indicator may divide a reference UL time-frequency resource into N parts, and each of the N parts may indicate whether or not it is pre-empted. In this case, N is a natural number. Specifically, the UL pre-emption indicator may be a bitmap containing N bits, each of which may indicate whether or not each of the N parts of the reference UL resource is pre-empted. In this case, N is a natural number. Specifically, the UL pre-emption indicator may be a bitmap of length 14 bits. In this case, the UL pre-emption indicator may divide the reference UL resource into 14 parts, and each of the 14 parts may indicate whether or not it is pre-empted. The 14 parts of the reference UL time-frequency resource may be divided into 14 parts on the time axis. In another particular embodiment, the 14 parts of the reference UL resource may be divided into 7 parts on the time axis and 2 parts on the frequency axis. A method for determining the number of symbols contained in a part of the reference UL time-frequency resource is described.

[0148] The reference UL time-frequency resource may be divided into N parts such that the difference in the number of symbols contained in each part of the reference UL time-frequency resource is at most 1. Specifically, when the reference UL time-frequency resource contains a total of S symbols, the mod(S,N) parts may contain ceil(S / N) symbols, and the N-mod(S,N) parts may contain floor(S / N) symbols. mod(X,Y) represents the remainder when X is divided by Y. ceil(X) represents the smallest integer greater than or equal to X. floor(X) represents the largest integer less than or equal to X. This can be expressed as mod(S,N) = S - floor(S / N) * N. In this case, the mod(S,N) parts placed ahead in time may contain ceil(S / N) symbols. In addition, in the embodiment described above, S and N are natural numbers.

[0149] The UE does not transmit physical uplink channels in symbols indicated by the UL Anticipation Indicator as being pre-empted, and transmits physical uplink channels in symbols indicated by the UL Anticipation Indicator as not being pre-empted. In another particular embodiment, the UE may transmit physical uplink channels sequentially in symbols in which it is possible to transmit physical uplink data channels, and discard the remaining physical uplink channels. In the embodiment of Figure 12, the UE is scheduled by the base station to transmit physical uplink data channels in 14 symbols. In this case, the UL Anticipation Indicator indicates that the 5th and 9th symbols are pre-empted. The UE does not have to transmit REs for physical uplink data channels corresponding to the 5th and 9th symbols, as shown in Figure 12(a). In this case, the UE may transmit REs for physical uplink data channels corresponding to the 5th and 9th symbols in additional time-frequency resources allocated. In addition, the UE may transmit REs for physical uplink data channels corresponding to 12 symbols sequentially, as shown in Figure 12(b). In this case, the UE may transmit REs for the physical uplink data channels corresponding to the 13th and 14th symbols among the additional time-frequency resources allocated.

[0150] The UE may transmit a physical uplink channel that could not be transmitted due to the pre-emption in a time-frequency resource different from the pre-emption time-frequency resource. In this case, the other time-frequency resource may be a different resource from the resource already scheduled for physical uplink transmissions. For convenience of explanation, the other time-frequency resource is referred to as an additional time-frequency resource. The additional time-frequency resource may be a time-frequency resource for uplink transmissions that is chronologically behind the resource already scheduled for physical uplink transmissions. The physical uplink channels scheduled for the pre-emption time-frequency resource and the additional time-frequency resource may have the same frequency resource. The additional time-frequency resource may be the symbol closest to the time-frequency resource on which the physical uplink data channel scheduled on the pre-emption time-frequency resource is scheduled, among the symbols designated as uplink symbols according to semi-static DL / UL allocation. In another particular embodiment, the additional time-frequency resource may be a semi-statically allocated uplink symbol or flexible symbol from the time-frequency resource on which the physical uplink channel scheduled for the pre-emption time-frequency resource is scheduled. Furthermore, the additional time-frequency resources may be symbols placed after N symbols following the physical uplink channel scheduled for the pre-empted time-frequency resources. In this case, N is a natural number. N can be constructed through the RRC signal. In another particular embodiment, N may be a constant.

[0151] In certain embodiments, the UL look-ahead indicator may include information about the start symbols of additional time-frequency resources. The UE may transmit physical uplink channels that are not transmitted due to the look-ahead from the start symbols of the additional resources indicated by the UL look-ahead indicator. In the embodiment of Figure 12, the UL look-ahead indicator indicates A as the start symbol of the additional time-frequency resources. As shown in Figure 12(a), the UE may transmit the RE of the PUSCH corresponding to the 5th and 9th symbols of the symbol that are not transmitted due to the look-ahead, A after the symbol in which the scheduled PUSCH for the look-aheaded time-frequency resource is scheduled. In Figure 12(a), B is the RE length of the PUSCH corresponding to the 5th symbol. In addition, as shown in Figure 12(b), the UE may transmit the RE of the PUSCH corresponding to the 13th and 14th symbols of the symbol, A after the symbol in which the scheduled PUSCH for the look-aheaded time-frequency resource is scheduled. In Figure 12(b), B is the RE length of the PUSCH corresponding to the 13th symbol.

[0152] The UL (Ultraviolet) look-ahead indicator may indicate whether transmission of a physical uplink channel that would otherwise be withheld due to look-ahead is required. Based on the UL look-ahead indicator, the UE may decide whether to transmit the physical uplink channel that would otherwise be withheld due to look-ahead. Specifically, the UL look-ahead indicator may indicate through a 1-bit field whether a physical uplink channel that would otherwise be withheld due to look-ahead should be transmitted. For example, when the value of the 1-bit field is 1, the UE may transmit the physical uplink channel that would otherwise be withheld due to look-ahead within the additional time-frequency resources. In addition, when the value of the 1-bit field is 0, the UE does not need to transmit the physical uplink channel that would otherwise be withheld due to look-ahead.

[0153] Figure 13 shows the range of physical uplink channels that a UE cannot transmit due to preemption according to one embodiment of the present invention.

[0154] When the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted and the time-frequency resources scheduled for transmission on the UE's physical uplink channel partially overlap, the UE does not need to transmit the entire physical uplink channel. In Figure 13(a), the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted and the time-frequency resources scheduled for transmission on the UE's physical uplink channel partially overlap. In this case, the UE does not transmit the entire physical uplink channel.

[0155] When the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted and the time-frequency resources scheduled for transmission of the UE's physical uplink channel partially overlap, the UE does not need to transmit the corresponding physical uplink channel only in the symbols that overlap with the time-frequency domain indicated by the UL Anticipation Indicator. In Figure 13(b), the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted and the time-frequency resources scheduled for transmission of the UE's physical uplink channel partially overlap. In this case, the UE does not transmit the corresponding physical uplink channel in the symbols that overlap with the time-frequency domain indicated by the UL Anticipation Indicator.

[0156] When the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted and the time-frequency resource scheduled for the transmission of the UE's physical uplink channel partially overlap, the UE does not need to transmit the corresponding physical uplink channel from the symbol corresponding to the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted, within the time-frequency resource where the transmission of the corresponding physical uplink channel is scheduled. In Figure 13(c), the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted and the time-frequency resource scheduled for the transmission of the UE's physical uplink channel partially overlap. In this case, the UE does not transmit the corresponding physical uplink channel from the symbol in the time-frequency domain indicated by the UL Anticipation Indicator as being pre-empted.

[0157] The physical uplink channel may include a DMRS for channel estimation. When the DMRS is not transmitted due to anticipation, the base station may not receive the physical uplink channel transmitted by the UE. The UE must consider whether or not to transmit the DMRS and transmit the physical uplink channel that may not be transmitted due to anticipation. This will be explained with reference to Figure 14.

[0158] Figure 14 shows an operation in which the UE transmits a physical uplink channel that could not be transmitted due to preemption, according to one embodiment of the present invention.

[0159] As described above, the UL look-ahead indicator may include information about additional time-frequency resources. Based on the information about the additional time-frequency resources, the UE may transmit a physical uplink channel within the additional time-frequency resources. In this case, the UE may transmit a physical uplink channel that could not be transmitted due to the look-ahead. In another specific embodiment, the UE may transmit an entire physical uplink channel that is partially not transmitted due to the look-ahead.

[0160] In this case, information about additional time-frequency resources may be expressed by the number of symbols or slots. Specifically, information about additional time-frequency resources may indicate that the additional time-frequency resources are placed several symbols after the last symbol of the time-frequency resource being pre-fetched, or the last symbol of the reference UL time-frequency resource. Alternatively, information about additional time-frequency resources may indicate that the additional time-frequency resources are placed several slots after the last symbol of the time-frequency resource being pre-fetched, or the last symbol of the reference UL time-frequency resource. The symbol in which the additional time-frequency resources are placed may be the earliest symbol among the symbols assigned as uplink symbols according to the semi-static DL / UL allocation, after the time-frequency resource being pre-fetched. Alternatively, the symbol in which the additional time-frequency resources are placed may be the symbol indicated by the DCI that schedules the transmission of the physical uplink channel.

[0161] The UE may determine which physical uplink channels should be transmitted in additional time-frequency resources depending on whether the DMRS on the physical uplink channel cannot be transmitted due to pre-emption. Specifically, if the UE does not transmit the DMRS due to pre-emption, the UE may retransmit the entire physical uplink channel that was partially not transmitted due to pre-emption in additional time-frequency resources. In addition, if the UE transmits the DMRS despite pre-emption occurring, the UE may transmit the portion of the physical uplink channel that was not transmitted due to pre-emption in additional time-frequency resources. If the physical uplink channel that is not transmitted due to pre-emption does not include the DMRS, the UE may transmit the portion of the physical uplink channel and the DMRS that was not transmitted due to pre-emption in additional time-frequency resources.

[0162] In the embodiment shown in Figure 14, the UE determines the time-frequency resource on which the pre-emption is occurring based on the UL pre-emption indicator. The UE is unable to transmit the physical uplink channel due to the pre-emption. In Figure 14(a), the UE is unable to transmit the DMRS of the physical uplink channel due to the pre-emption. Therefore, the UE transmits the entire physical uplink channel within the additional time-frequency resource indicated by the UL pre-emption indicator. In Figure 14(b), the UE is unable to transmit a portion of the physical uplink channel due to the pre-emption, but transmits the DMRS of the physical uplink channel. Therefore, the UE may transmit the portion of the physical uplink channel that was not transmitted due to the pre-emption within the additional time-frequency resource. In this case, the UE transmits the portion of the physical uplink channel and the DMRS.

[0163] Figure 15 shows the range of physical uplink channels that a UE cannot transmit due to preemption according to another embodiment of the present invention.

[0164] The physical uplink data channel may include DMRS for channel estimation. In addition, the physical uplink data channel may include uplink control information (UCI). In this case, the UCI may be transmitted within the RE around the DMRS symbol. If the look-ahead does not affect the DMRS and UCI transmissions, the UE may transmit the physical uplink data channel within the symbols through which the DMRS and UCI are transmitted. In this case, the UE does not have to transmit the physical uplink data channel at the time-frequency indicated by the UL look-ahead indicator that it is being looked-ahead, as shown in Figure 15(a). In another particular embodiment, the UE does not have to transmit the physical uplink data channel within the remaining symbols except for the symbols through which the DMRS and UCI are transmitted, as shown in Figure 15(b). When the look-ahead affects the DMRS and UCI transmissions, the UE does not have to transmit the entire physical uplink data channel, as shown in Figure 15(c). Examples of situations where preemptive transmissions affect DMRS and UCI transmissions include cases where the time-frequency domain in which the UL preemptive indicator indicates preemptive transmission is occurring overlaps with the physical uplink channel on which the DMRS or UCI transmission is scheduled.

[0165] Figure 16 shows an operation in which a UE transmits DMRS and UCI that could not be transmitted due to preemption, according to one embodiment of the present invention.

[0166] The UE may determine the type of physical uplink data channel to be transmitted within the additional time-frequency resources, depending on the information contained within the physical uplink data channel. Specifically, the UE may determine the type of physical uplink data channel to be transmitted within the additional time-frequency resources depending on whether the look-ahead affects the uplink control information (UCI) transmission contained within the physical uplink data channel. An example of the look-ahead affecting the UCI transmission contained within the physical uplink data channel is an example where at least a portion of the RE scheduled for UCI transmission cannot be transmitted due to the look-ahead. When the look-ahead does not affect the UCI transmission contained within the physical uplink data channel, the UE does not have to transmit only the physical uplink data channels scheduled for the time-frequency resources indicated by the UL look-ahead indicator. In this case, the UE does not have to transmit the physical uplink data channels that cannot be transmitted due to the look-ahead within the additional time-frequency resources. When the look-ahead affects UCI transmissions contained within a physical uplink data channel, the UE does not have to transmit the entire physical uplink data channel or the physical uplink data channel indicated by the UL look-ahead indicator. In this case, the UE may transmit the entire physical uplink data channel or the physical uplink data channel indicated by the UL look-ahead indicator within additional time-frequency resources. In this case, the UE may transmit the physical uplink data channel containing only UCI within additional time-frequency resources. Specifically, the UE may transmit the physical uplink data channel except for the destination symbols to which only the uplink shared channel (UL-SCH) is mapped. In another particular embodiment, the UE may transmit the physical uplink data channel except for the RE to which the uplink shared channel (UL-SCH) is mapped. In another particular embodiment, the UE may transmit the physical uplink data channel containing both UL-SCH and UCI within additional time-frequency resources.In this embodiment, the UCI may be limited to HARQ-ACK information only. Alternatively, the UCI may include HARQ-ACK information and CSI. In the embodiment of Figure 16, the UL advance indicator indicates that the RE scheduled for DMRS and UCI transmissions is advance. Therefore, the UE does not transmit the entire physical uplink data channel, or the physical uplink data channel indicated by the UL advance indicator. The UE transmits the physical uplink data channel containing only DMRS and UCI within the additional time-frequency resources indicated by the UL advance indicator.

[0167] Specifically, depending on whether the preemption affects at least one of the UCI and DMRS transmissions contained within the physical uplink data channel, the UE may determine which type of physical uplink data channel should be transmitted within the additional time-frequency resources. Instances where the transmission of UCI or DMRS contained within the physical uplink data channel is affected include instances where at least a portion of the REs scheduled for UCI transmissions and REs scheduled for DMRS transmissions cannot be transmitted due to the preemption. If the preemption does not affect the transmission of UCI or DMRS contained within the physical uplink data channel, the UE does not have to transmit the scheduled physical uplink data channel within the time-frequency resources indicated by the UL preemption indicator. In this case, the UE does not have to transmit the physical uplink data channel that cannot be transmitted due to the preemption within the additional time-frequency resources. If the preemption affects the transmission of UCI or DMRS contained within the physical uplink data channel, the UE does not have to transmit the entire physical uplink data channel. In this case, the UE may transmit the entire physical uplink data channel within the additional time-frequency resources. In this case, the UE may transmit a physical uplink data channel containing only the UCI within additional time-frequency resources. In another specific embodiment, the UE may transmit a physical uplink data channel containing both the UL-SCH and the UCI within additional time-frequency resources. In this embodiment, the UCI may be limited to HARQ-ACK information only. Alternatively, the UCI may include HARQ-ACK information and CSI.

[0168] When a UE whose physical uplink channel is pre-authorized due to a UL pre-authorization indicator transmits the pre-authorized physical uplink channel through an additional time-frequency resource, the UE may receive another UL pre-authorization indicator. Therefore, when pre-authorization occurs within an additional time-frequency resource, the UE does not have to transmit the physical uplink channel within that additional time-frequency resource. In this case, based on the UL pre-authorization indicator indicating pre-authorization within an additional time-frequency resource, the UE may transmit the physical uplink channel that is not transmitted by pre-authorization within the new additional time-frequency resource. Specifically, when a UL pre-authorization indicator indicating pre-authorization within an additional time-frequency resource indicates a new additional time-frequency resource, the UE may transmit the physical uplink channel that is not transmitted by pre-authorization within the new additional time-frequency resource. In another particular embodiment, even when a UL pre-authorization indicator indicating pre-authorization within an additional time-frequency resource indicates a new additional time-frequency resource, the UE does not have to transmit the physical uplink channel that cannot be transmitted by pre-authorization within the new additional time-frequency resource.

[0169] When a physical uplink control channel is pre-empted, the UE may decide whether to transmit the physical uplink control channel on an additional time-frequency resource, based on the information contained within the physical uplink control channel. Specifically, if the physical uplink control channel contains a HARQ-ACK and the pre-emption affects the transmission of the physical uplink control channel, the UE does not have to transmit the corresponding physical uplink control channel on the time-frequency resource where the transmission is scheduled. In this case, the UE may transmit the physical uplink control channel that could not be transmitted due to the pre-emption on an additional time-frequency resource.

[0170] The embodiments described above describe a method for transmitting a UE's physical channel when a time-frequency resource scheduled for a UE's uplink transmission is used by another UE. The base station may reschedule a time-frequency resource scheduled for a UE's uplink transmission to another uplink transmission of the corresponding UE, taking into account differences in reliability and QoS conditions. Specifically, the base station may schedule a physical uplink transmission containing URLLC data within the time-frequency resource where a UE's physical uplink transmission is scheduled. Specifically, the transmission of a physical uplink channel containing a UE's URLLC data may be scheduled within the time-frequency resource where a UCI transmission transmitted within a UE's PUSCH / PUCCH is scheduled. In this case, the UCI may be either a HARQ-ACK or a CSI. In this case, a method for the UE to transmit and to omit the UCI transmission needs to be specified. In addition, the UE needs to multiplex data transmissions having different QoS conditions and different transmission durations. In addition, the UE needs to multiplex data transmissions requiring different reliability. Embodiments for such transmissions are described.

[0171] The first example described is one in which a UE's transmission of relatively low-priority data over the physical uplink data channel is preempted by a UE's transmission of relatively high-priority data over the physical uplink data channel. In this specification, priority may be replaced by at least one of QoS conditions and reliability conditions. For convenience of explanation, relatively low-priority data is referred to as general data, and data with higher priority than general data is referred to as priority data.

[0172] When a UE's transmission of priority data via a physical uplink data channel is scheduled within a time-frequency resource where a UE's transmission of a physical uplink data channel containing general data (including its UCI) is scheduled, the UE may transmit the UCI of the general data via the physical uplink data channel. Specifically, when a UE's transmission of priority data via a physical uplink data channel is scheduled within a time-frequency resource where a UE's transmission of a physical uplink data channel containing its UCI is scheduled, the UE may transmit the UCI of the general data via the physical uplink data channel by mapping it to the remaining time-frequency resources, excluding the time-frequency resources scheduled for the transmission of priority data via the physical uplink data channel from the time-frequency resources scheduled for the transmission of general data via the physical uplink data channel. When a UE's transmission of a physical uplink data channel containing its UCI does not overlap with scheduled time-frequency resources and the UE's transmission of priority data via the physical uplink data channel, the UE may transmit the scheduled physical uplink data channel containing general data within a time-frequency resource excluding the time-frequency resources where the transmission of priority data via the physical uplink data channel is scheduled.

[0173] In another specific embodiment, when a UE's physical uplink data channel transmission of priority data is scheduled within the same time-frequency resource where a UE's UCI transmission of general data, including the UCI, is scheduled, the UE may decide whether to transmit the UCI depending on the type of UCI. When the UCI is a HARQ-ACK, the UE may transmit the UCI by mapping the RE of the general data's physical uplink data channel to the remaining time-frequency resource, excluding the time-frequency resource where the priority data transmission is scheduled from the time-frequency resource where the general data transmission is scheduled. In addition, when the UCI is CSI portion 1 or CSI portion 2, the UE may omit the UCI transmission. Omitting a HARQ-ACK transmission may reduce downlink transmission throughput, which can be prevented through the embodiments described above.

[0174] In another specific embodiment, when the UCI is HARQ-ACK or CSI portion 1, the UE may transmit the UCI by mapping the RE of the physical uplink data channel for general data to the remaining time-frequency resources, excluding the time-frequency resources where the physical uplink data channel transmission of priority data is scheduled from the time-frequency resources where the transmission of general data on the physical uplink data channel is scheduled. In addition, when the UCI is CSI portion 2, the UE may omit the UCI transmission. Omitting HARQ-ACK transmissions and CSI portion 1 transmissions may reduce downlink transmission throughput. This can be prevented through the embodiments described above.

[0175] In the embodiments described above, the UE's transmission of priority data on the physical uplink data channel may be scheduled within a time-frequency resource where all UCI transmissions of the UE's general data physical uplink data channel, including the UCI, are scheduled. In this case, the UE may transmit all UCIs of the general data physical uplink data channel within the remaining time-frequency resources, excluding the time-frequency resources where the priority data physical uplink data channel transmission is scheduled from the time-frequency resources where the general data physical uplink data channel transmission is scheduled. In addition, the UE's transmission of priority data on the physical uplink data channel may be scheduled within a time-frequency resource where some UCI transmissions of the UE's general data physical uplink data channel are scheduled. In this case, the UE may transmit some overlapping UCIs of the general data physical uplink data channel within the remaining time-frequency resources, excluding the time-frequency resources where the priority data physical uplink data channel transmission is scheduled from the time-frequency resources where the general data physical uplink data channel transmission is scheduled.

[0176] This section describes an example where a UE's transmission of relatively low-priority data (general data) via the physical uplink control channel is preempted by a UE's transmission of relatively high-priority data (priority data) via the physical uplink data channel.

[0177] When a UE's physical uplink data channel transmission of priority data is scheduled within the same time-frequency resource as the UE's general data physical uplink control channel transmission, the UE may omit the transmission of the general data physical uplink control channel. Specifically, the UE may omit the transmission of the physical uplink control channel for a particular cell group in which the priority data physical uplink control channel is scheduled. This is because intermodulation distortion (IMD) can occur when physical uplink control channels and physical uplink data channels are transmitted simultaneously from different frequency resources.

[0178] In another specific embodiment, when the transmission of priority data on the physical uplink data channel of a UE is scheduled within the same time-frequency resource as the transmission of general data on the physical uplink control channel of the UE, the UE may decide whether to omit the transmission of the physical uplink control channel depending on the type of UCI of the physical uplink control channel. Specifically, the UE may decide whether to omit the transmission of the physical uplink control channel depending on whether the UCI of the physical uplink control channel contains a HARQ-ACK. If the UCI of the physical uplink control channel does not contain a HARQ-ACK, the UE may omit the transmission of the physical uplink control channel. If the UCI of the physical uplink control channel contains a HARQ-ACK, the UE may multiplex the physical uplink control channel and the physical uplink data channel for transmitting the priority data. A method for multiplexing the physical uplink control channel and the physical uplink data channel for priority data is described.

[0179] To prevent the symbols transmitted within the physical uplink data channel for priority data from overlapping with the physical uplink data channel for general data within a single slot, the UE may transmit the physical uplink data channel for priority data and the physical uplink control channel for general data via time-division multiplexing (TDM). Specifically, the UE may transmit the physical uplink control channel for general data using a shortened physical uplink control channel format within symbols that do not overlap with the physical uplink data channel for priority data. In this case, the shortened physical uplink control channel format may take the form of a physical uplink control channel in which some of the time domains in which the corresponding physical uplink control channel is scheduled are punctured. Specifically, it may be a shortened PUCCH format. Through this, the physical uplink data channel and the physical uplink control channel may be transmitted simultaneously to prevent IMD from occurring. In this case, the symbols may be DFTs-OFDM symbols or OFDM symbols. In certain embodiments, when the physical uplink data channel for priority data is transmitted within a sequence of symbols, the UE may use TDM at the symbol level to transmit the physical uplink data channel for priority data and the physical uplink control channel for general data together in a single slot. When the physical uplink data channel for priority data is transmitted within a discontinuous sequence of symbols, the UE may omit the transmission of the physical uplink control channel for general data because a shortened physical uplink control channel format cannot be used.

[0180] The UE may puncture the time-frequency resources where the physical uplink control channel transmission of general data is scheduled within the time-frequency resources where the physical uplink data channel for priority data is scheduled, in order to transmit the physical uplink data channel for priority data. This is because, according to the QoS and requirements of the downlink data, it may be necessary to receive the physical uplink control channel, including the HARQ-ACK. When a base station schedules the transmission of priority data, it may decide that a portion of the priority data will be punctured to transmit the physical uplink control channel for general data. Even if a portion of the priority data is punctured to transmit the physical uplink control channel for general data, the base station can still receive the priority data. In addition, even if the physical uplink control channel and the physical uplink data channel are transmitted within the same symbol, there may be no frequency separation between the two channels, and as a result, IMD may not occur.

[0181] The UE may piggyback the physical uplink control channel for general data to the physical uplink data channel for priority data in order to transmit general data. In this case, the UE does not have to transmit the physical uplink data channel for priority data and the physical uplink control channel for general data immediately and simultaneously. Specifically, the UE may first piggyback the UCI that should be transmitted through the physical uplink control channel for general data to the physical uplink data channel for priority data and then transmit it. The UE piggybacks all UCIs to the physical uplink data channel for priority data in order to transmit all UCIs. In another particular embodiment, the UE may decide whether to transmit a UCI by piggybacking it to the physical uplink data channel for priority data, depending on the type of UCI. For example, when the type of UCI is HARQ-ACK, the UE may transmit the UCI by piggybacking it to the physical uplink data channel for priority data. Otherwise, when the UCI type is HARQ-ACK or CSI part 1, the UE may piggyback the UCI to the physical uplink data channel for priority data in order to transmit the UCI.

[0182] The UE may transmit the UCI that should be transmitted through the physical uplink control channel for general data through N symbols following the physical uplink data channel for priority data, where N is a natural number. Specifically, the UE may designate N symbols following the physical uplink data channel for priority data as reserved symbols, and transmit the UCI that should be transmitted through the physical uplink control channel for general data through those N symbols.

[0183] A base station may schedule the physical uplink data channel for priority data, taking into account the UCI size of the physical uplink control channel for general data. Specifically, a base station may schedule the physical uplink data channel for priority data and the UCI of the physical uplink control channel for general data so that they do not overlap, taking into account the UCI size of the physical uplink control channel for general data.

[0184] In the embodiments described above, it is explained that a physical uplink data channel transmission of priority data is scheduled again within the time-frequency resource in which a physical uplink control channel transmission of priority data is scheduled. However, the embodiments described above may also apply when a physical uplink data channel transmission of other priority data is scheduled at the same time that a time-frequency resource in which a physical uplink control channel transmission of priority data is scheduled is scheduled. That is, the embodiments described above may also apply when a physical uplink data channel transmission of other data of the same priority is scheduled within the time-frequency resource in which a physical uplink control channel transmission of any one data is scheduled.

[0185] The following describes a scenario in which a UE transmits both relatively low-priority data (general data) and relatively high-priority data (priority data) via a physical uplink control channel within a single symbol, or a scenario in which a UE transmits data of the same priority via a physical uplink control channel within a single symbol. In this case, the UE may use one physical uplink control channel in a slot where two physical uplink control channels are scheduled to transmit the UCI of the two physical uplink control channels scheduled on a single symbol. In this case, the method by which the UE selects the time-frequency resource for transmitting one physical uplink control channel may be an issue. In addition, the UE may transmit one of the two physical uplink control channels scheduled on a single symbol within the initially scheduled time-frequency resource, and transmit the remaining physical uplink control channel within a different time-frequency resource that does not overlap with any other physical uplink control channel. In this case, the method by which the UE selects the time-frequency resource for transmitting the remaining physical uplink control channel may be an issue. The method by which a UE selects a time-frequency resource in which one physical uplink control channel transmits, or a different time-frequency resource in which the remaining physical uplink control channel transmits, is described in detail with reference to Figure 17. In addition, for the sake of explanation, a physical uplink channel that transmits the UCIs of two physical uplink control channels scheduled on one symbol, or a physical uplink control channel that transmits within a different time-frequency resource of the two physical uplink control channels, is called an alternate physical uplink control channel. The time-frequency resource in which an alternate physical uplink control channel transmission is scheduled is called an alternate time-frequency resource.

[0186] Figure 17 shows a method for a UE to select an alternative physical uplink control channel according to one embodiment of the present invention.

[0187] A base station may configure multiple time-frequency resources within a single slot, in which a UE may transmit a physical uplink control channel. The UE may select one of the multiple time-frequency resources and transmit an alternative physical uplink control channel within the selected time-frequency resource.

[0188] The UE may determine an alternative time-frequency resource for transmitting an alternative physical uplink control channel based on the position of the final symbol of the time-frequency resource occupied by multiple physical uplink control channels configured by the base station within a slot in which two physical uplink control channels are configured. Specifically, within a slot configured with two physical uplink control channels, the UE may select as an alternative time-frequency resource the time-frequency resource of the physical uplink control channel whose final symbol is the earliest among the time-frequency resources of multiple physical uplink control channels, and may transmit it to the alternative physical uplink control channel through the selected alternative time-frequency resource.

[0189] There may be multiple time-frequency resources for a physical uplink control channel whose last symbol is at the forefront. In this case, the UE may select an alternative time-frequency resource based on the number of symbols in the physical uplink control channel's time-frequency resource after the position of the last symbol in that physical uplink control channel's time-frequency resource. Specifically, the UE may select the time-frequency resource of the physical uplink control channel having the longest length (maximum number of symbols) among the time-frequency resources of the physical uplink control channel whose last symbol is at the forefront as the alternative time-frequency resource. The UE may transmit the alternative physical uplink control channel through the selected alternative time-frequency resource. That is, the UE may select a physical uplink control channel time-frequency resource for transmitting the alternative physical uplink control channel by considering the position of the starting symbol of the physical uplink control channel's time-frequency resource after the position of the last symbol in that physical uplink control channel's time-frequency resource.

[0190] When multiple physical uplink control channel time-frequency resources are selected based on the length of the physical uplink control channel time-frequency resource after the last symbol position of the physical uplink control channel time-frequency resource, the UE may arbitrarily select one of the selected physical uplink control channel time-frequency resources and transmit an alternative physical uplink control channel through the selected time-frequency resource. For example, in step 1, the UE may select the time-frequency resource of the physical uplink control channel whose last symbol is furthest forward among the time-frequency resources of multiple physical uplink control channels in a given slot as the first candidate alternative time-frequency resource set. If the first candidate alternative time-frequency resource set includes multiple physical uplink control channel time-frequency resources, in step 2, the UE may select the time-frequency resource of the physical uplink control channel with the longest length among the first candidate alternative time-frequency set as the second candidate alternative time-frequency set. If the second candidate alternative time-frequency resource set includes multiple physical uplink control channel time-frequency resources, in step 3, the UE may randomly select any one physical uplink control channel time-frequency resource from the second candidate alternative time-frequency resource set and select it as an alternative time-frequency resource, and transmit the alternative physical uplink control channel through the selected alternative time-frequency resource. If there is one time-frequency resource for a physical uplink control channel corresponding to the alternative time-frequency set, the UE may, without further selection, select the time-frequency resource for the corresponding physical uplink control channel as an alternative time-frequency resource, and transmit the alternative physical uplink control channel through the selected alternative time-frequency resource.

[0191] In the embodiment shown in Figure 17, the time-frequency resources of five physical uplink control channels are configured within slots where two physical uplink control channel transmissions are scheduled within a single symbol. In this case, the UE selects the second and fourth physical uplink control channel time-frequency resources, which have the earliest position of the final symbol among the five physical uplink control channel time-frequency resources, as the first candidate physical uplink control channel time-frequency resource set. In addition, the UE selects the fourth physical uplink control channel time-frequency resource, which has the longest length (maximum number of symbols) within the first candidate physical uplink control channel time-frequency resource set, as the second candidate physical uplink control channel time-frequency resource set. Since there is only one physical uplink control channel time-frequency resource in the second candidate physical uplink control channel time-frequency resource set, the UE transmits the alternative physical uplink control channel through the fourth physical uplink control channel time-frequency resource.

[0192] The UE may select an alternative physical uplink control channel from among the physical uplink control channels scheduled for a time-frequency resource that has a symbol that is the same as or earlier than the last symbol in two time-frequency resources scheduled within a single symbol. This operation may be applicable to the embodiments described above.

[0193] For example, in step 1, the UE may select as the first candidate physical uplink control channel set a physical uplink control channel time-frequency resource that has a final symbol that is the same as or earlier than the latest symbol among the time-frequency resources of multiple physical uplink control channels in a given slot, among the time-frequency resources to which two physical uplink control channels are scheduled for which the final symbol in one symbol is scheduled. In step 2, the UE may select as the second candidate physical uplink control channel time-frequency resource set a physical uplink control channel whose final symbol is the earliest among the time-frequency resources of the first candidate physical uplink control channel set. If the second candidate physical uplink control channel time-frequency resource set includes time-frequency resources of multiple physical uplink control channels, in step 3, the UE may select as the third candidate physical uplink control channel time-frequency set a physical uplink control channel whose longest physical uplink control channel time-frequency resource is from the second candidate physical uplink control channel time-frequency resource set. If the time-frequency resource set of the third candidate physical uplink control channel includes time-frequency resources of multiple physical uplink control channels, in step 4, the UE may randomly select any one physical uplink control channel's time-frequency resource from the third candidate physical uplink control channel's time-frequency resource set and transmit the alternative physical uplink control channel from the selected physical uplink control channel's time-frequency resource. If there is one physical uplink control channel's time-frequency resource corresponding to the candidate physical uplink control channel's time-frequency set, the UE may transmit the alternative physical uplink control channel through the corresponding physical uplink control channel's time-frequency resource without any further selection.

[0194] The first physical uplink control channel may contain time-sensitive information such as the HARQ-ACK for the URLLC service. In addition, decoding of the physical uplink control channel may be performed after all physical uplink control channels have been received. Thus, through the examples described above, UCI intended to be transmitted through the first physical uplink control channel can be transmitted and decoded as quickly as possible. Furthermore, the reliability of UCI transmission increases as the length of the physical uplink control channel increases. Thus, the reliability of transmission on the alternative physical uplink control channel can be increased through the examples described above.

[0195] A physical uplink control channel may contain multiple types of UCI, depending on the type of UCI information, such as HARQ-ACK, CSI part 1, and CSI part 2. In this case, the UE may transmit only some of the UCI types that the UE intends to transmit through the physical uplink control channel through an alternative physical uplink control channel. In this case, the UE may select the UCIs to be transmitted through the alternative physical uplink control channel based on the priority of the UCI types.

[0196] As described above, the UE may transmit one of two physical uplink control channels scheduled within the same symbol in the time-frequency resource where the corresponding physical uplink control channel is scheduled, and transmit the other physical uplink control channel in an alternative physical time-frequency resource. In this case, the UE may select the physical uplink control channel to be transmitted within the time-frequency resource where the corresponding physical uplink control channel is scheduled, according to the priority between the physical uplink control channels. In this case, the UE may transmit the unselected physical uplink control channel in an alternative physical time-frequency resource.

[0197] In certain embodiments, the UE may obtain the priority between physical uplink control channels from the base station. Specifically, when the DCI configures the UE's transmission of physical uplink control channels, the UE may obtain the priority between physical uplink control channels through the DCI. An example of the DCI configuring the UE's transmission of physical uplink control channels may be the DCI configuring the UE's HARQ-ACK transmission. In addition, an example of the DCI configuring the UE's transmission of physical uplink control channels may be the DCI configuring the UE's aperiodic CSI transmission. The priority between physical uplink control channels may be explicitly indicated through a separate field of the DCI.

[0198] In another specific embodiment, the priority between physical uplink control channels may be implicitly indicated in the DCI field. The priority between physical uplink control channels may be determined according to the HARQ process number (HPN). The priority between physical uplink control channels may be determined according to the time domain allocation field. Specifically, HARQ-ACKs of physical downlink data channels scheduled in the time domain allocation field may have a higher priority. The priority between physical uplink control channels may be determined based on the MCS used for target transmission, signaled by the UCI of the physical uplink control channel. Specifically, the priority between physical uplink control channels may be determined such that a physical uplink control channel containing a HARQ-ACK of a physical downlink data channel that is more reliably transmitted has a higher priority. In a particular embodiment, the priority between physical uplink control channels may be determined such that a physical uplink control channel containing a HARQ-ACK of a physical downlink data channel transmitted at a lower code rate has a higher priority. Priority between physical uplink control channels may be determined based on the MCS used for target transmission, signaled by the UCI of the physical uplink control channel. Priority between physical uplink control channels may be determined based on the physical uplink control channel resource indicator. Specifically, priority between physical uplink control channels may be determined such that a higher priority is given when the value of the physical uplink control channel resource indicator indicates that the physical uplink control channel is smaller. Priority between physical uplink control channels may be determined based on the physical uplink control channel resource indicator. Specifically, priority between physical uplink control channels may be determined such that a higher priority is given when the symbol scheduled with the physical uplink control channel is earlier.Priority between physical uplink control channels may be determined according to the time series in which a physical downlink control channel indicating a physical uplink control channel or a DCI indicating a physical uplink control channel is transmitted. Specifically, priority between physical uplink control channels may be determined such that a higher priority is given when the time in which a physical downlink control channel indicating a physical uplink control channel or a DCI indicating a physical uplink control channel is transmitted is earlier. Priority between physical uplink control channels may be determined according to the service characteristics of the physical downlink data channel scheduled by the physical downlink control channel indicating the time frequency resource in which the physical uplink control channel is scheduled. Specifically, a physical uplink control channel scheduled by a physical downlink control channel to schedule a physical downlink data channel for a URLLC service may have higher priority than a physical uplink control channel scheduled by a physical downlink control channel to schedule a physical downlink data channel for an eMBB service. The UE may determine the service characteristics of a physical downlink data channel scheduled by a physical downlink control channel based on the RNTI value of the physical downlink control channel. In another specific embodiment, the UE may determine the service characteristics of a physical downlink data channel scheduled by a physical downlink control channel according to the value of the DCI field. The priority between physical uplink control channels may be determined according to the type of UCI included in the physical uplink control channel. Specifically, a physical uplink control channel containing a HARQ-ACK may have a higher priority than a physical uplink control channel containing a CSI. The priority between physical uplink control channels may be determined according to a K1 value indicating the transmission time interval between the HARQ-ACK included in the physical uplink control channel and the physical downlink data channel. Specifically, the priority between physical uplink control channels may be determined such that a smaller K1 value results in a higher priority.This is because faster processing may be required when the interval between the physical downlink data channel and the HARQ-ACK is smaller.

[0199] In addition, the UE may transmit physical uplink control channels of the same priority through a single physical uplink control channel. In this case, the UE may determine the time-frequency resources transmitted within the corresponding physical uplink control channel in accordance with the embodiments described above.

[0200] In addition, the UE may transmit the corresponding physical uplink control channels through a shortened format rather than omitting the transmission of lower-priority physical uplink control channels. Specifically, the UE may transmit lower-priority physical uplink control channels through a shortened format using time-frequency resources excluding the time-frequency resources in which higher-priority physical uplink control channels are transmitted. In addition, when the UE creates a shortened format physical uplink control channel, the UE may puncture the UCI of symbols that overlap in the time domain with the higher-priority physical uplink control channel. In another particular embodiment, the UE may rate-match lower-priority physical uplink control channels to physical uplink control channels in shortened format. Specifically, the UE may determine the time-frequency resources of the physical uplink control channel according to a code rate that uses only the time-frequency resources that should be used for transmission. When the physical uplink control channel is format 2 or format 3, the number of PRBs, which are frequency resources occupied by the physical uplink control channel, may be determined according to the UCI and configured code rate of the physical uplink control channel. The UE may determine the number of PRBs in the shortened format using the resources that can actually be transmitted (resources of symbols other than those that will be punctured) and the configured code rate. When a DMRS cannot be transmitted through the shortened format physical uplink control channel, the UE may omit the corresponding physical uplink control channel transmission. Instances in which a DMRS cannot be transmitted through the shortened format physical uplink control channel may include instances in which the DMRS cannot be transmitted due to the length of the shortened format physical uplink control channel.

[0201] A UE may transmit either a grant-free (GF) physical uplink data channel or a grant-based (GB) configured physical uplink data channel. In this case, the grant-free configured physical uplink data channel may be a physical uplink data channel scheduled through an RRC configuration. Grant-free physical uplink data channels are sometimes called configured granted physical uplink data channels. A grant-based configured physical uplink data channel may also be a physical uplink data channel configured through a DCI of a physical downlink control channel. When a grant-free configured physical uplink data channel overlaps with a scheduled time-frequency resource and a grant-based configured physical uplink data channel, the UE may omit transmission from one of the two physical uplink data channels and transmit only the other physical uplink data channel. In this case, the UE's operation is described.

[0202] When there is data to be transmitted through an unauthorized physical uplink data channel (e.g., UL-SCH), the UE may omit authorization-based physical uplink data channel transmissions and transmit the unauthorized physical uplink data channel. This is because the unauthorized physical uplink data channel may be more suitable for services that require rapid transmission, such as URLLC data. In certain embodiments, when the transmission period of the unauthorized physical uplink data channel is shorter than a certain period and there is data to be transmitted through the unauthorized physical uplink data channel (e.g., UL-SCH), the UE may omit authorization-based physical uplink data channel transmissions and transmit the unauthorized physical uplink data channel. In certain embodiments, when the transmission period of the unauthorized physical uplink data channel is not shorter than a certain period, the UE may transmit authorization-based physical uplink data channel transmissions and omit the unauthorized physical uplink data channel transmissions. When a UE omits an authorization-based physical uplink data channel transmission and transmits an unauthorized physical uplink data channel, the UE may transmit UCIs that would otherwise be transmitted through the authorization-based physical uplink data channel through the unauthorized physical uplink data channel. In this case, the UE may transmit all UCIs that would otherwise be transmitted through the authorization-based physical uplink data channel through the unauthorized physical uplink data channel. In another specific embodiment, the UE may transmit some UCIs that would otherwise be transmitted through the authorization-based physical uplink data channel through the unauthorized physical uplink data channel. For example, when an authorization-based physical uplink data channel is included in a non-periodic CSI, the UE may transmit all or part of the non-periodic CSI through the unauthorized physical uplink data channel. When the authorization-based physical uplink data channel includes CSI portion 1 and CSI portion 2, the UE may transmit only CSI portion 1 of CSI portion 1 and CSI portion 2 through the unauthorized physical uplink data channel.When the authorization-based physical uplink data channel includes a HARQ-ACK and a non-periodic CSI, the UE may transmit all or part of the HARQ-ACK and the non-periodic CSI through the unauthorized physical uplink data channel. In this case, the UE may transmit only the HARQ-ACK through the unauthorized physical uplink data channel without transmitting the CSI. In another specific embodiment, the UE may transmit only the HARQ-ACK and CSI portion 1 through the unauthorized physical uplink data channel without transmitting CSI portion 2.

[0203] In another specific embodiment, when the time-frequency resources on which a permit-based physical uplink data channel is scheduled and the time-frequency resources on which an unpermitted physical uplink data channel is scheduled overlap, the base station may signal which of the two physical uplink data channels—permit-based or unpermitted—will be transmitted. Specifically, the base station may signal which of the two physical uplink data channels—permit-based or unpermitted—will be transmitted by the UE in the DCI that schedules the permit-based physical uplink data channel. The UE may determine which of the two physical uplink data channels—permit-based or unpermitted—should be transmitted based on the DCI that schedules the permit-based physical uplink data channel. Specifically, the DCI may signal which of the two physical uplink data channels—permit-based or unpermitted—will be transmitted by the UE. In certain embodiments, a single bit field of the DCI may signal whether the UE is transmitting a permission-based physical uplink data channel or an unpermission-based physical uplink data channel.

[0204] In another specific embodiment, the DCI may implicitly signal which of the two physical uplink data channels—authorized-based or unauthorized-based—is transmitted by the UE. For example, when the code rate of the MCS value of the physical downlink control channel (or DCI) that schedules the authorized-based physical uplink data channel is less than a certain value, the UE may transmit the authorized-based physical uplink data channel and omit the unauthorized-based physical uplink data channel transmission. When the code rate of the MCS value of the physical downlink control channel (or DCI) that schedules the authorized-based physical uplink data channel is greater than a certain value, the UE may omit the authorized-based physical uplink data channel transmission and transmit the unauthorized-based physical uplink data channel transmission. In this case, the certain value may be a predetermined value, or it may be comprised of an RRC signal, or it may be a value that is configured when the unauthorized-based physical uplink data channel is configured.

[0205] The UE may determine which physical uplink data channel to transmit—an authorization-based physical uplink data channel or an unauthorized physical uplink data channel—based on the locations of symbols transmitted through the authorization-based physical uplink data channel and the locations of symbols transmitted through the unauthorized physical uplink data channel. Specifically, if the transmission of the authorization-based physical uplink data channel is completed before the transmission of the unauthorized physical uplink data channel, the UE may transmit the authorization-based physical uplink data channel and omit the transmission of the unauthorized physical uplink data channel. If the transmission of the authorization-based physical uplink data channel is not completed before the transmission of the unauthorized physical uplink data channel, the UE may omit the transmission of the authorization-based physical uplink data channel and transmit the unauthorized physical uplink data channel.

[0206] The UE may determine which physical uplink data channel to transmit—an authorization-based physical uplink data channel or an authorization-less physical uplink data channel—based on the K2 value of the DCI that schedules the authorization-based physical uplink data channel. In this case, the K2 value is a value that indicates the interval between the physical downlink control channel and the authorization-based physical uplink data channel. Specifically, when the K2 value is less than a certain value, the UE may transmit an authorization-based physical uplink data channel and omit the authorization-less physical uplink data channel transmission. Specifically, when the K2 value is greater than or equal to a certain value, the UE may omit the authorization-based physical uplink data channel and transmit an authorization-less physical uplink data channel transmission. The certain value may be a fixed value. For example, the certain value may be 0 or 1. In another particular embodiment, the certain value may be a value composed of higher layers. In another particular embodiment, the certain value may be determined based on the duration of the authorization-less physical uplink data channel. For example, the certain value may be the duration of the authorization-less physical uplink data channel.

[0207] In the embodiments described above, the physical data channel may include PDSCH or PUSCH. In addition, the physical control channel may include PDCCH or PUCCH. Furthermore, in embodiments described using PUSCH, PDCCH, PUCCH, and PDCCH, other types of data channels and control channels may be applied.

[0208] The methods and systems described herein are described in relation to specific embodiments and components, and some or all of the operations of the herein may be performed using a computer system having a general-purpose hardware architecture.

[0209] The descriptions in this disclosure provided above are for illustrative and explanatory purposes only. It will be apparent to those skilled in the art to which this disclosure relates that this disclosure can be readily modified into other detailed forms without altering the technical principles or essential features of this disclosure. Accordingly, these embodiments described above are proposed for illustrative purposes only and do not limit this disclosure. For example, each component described as being of a single type may be implemented in a distributed manner. Similarly, components described as being distributed may be implemented in combination.

[0210] The scope of this disclosure is presented by the attached claims, rather than by the description above. It should be understood that all changes or modifications derived from the definitions and scope of the claims, as well as their equivalents, fall within the scope of this disclosure. [Explanation of symbols]

[0211] 100 User Equipment (UE) 110 processors 120 Communication Modules 121, 122 Cellular communication interface card 123 Unlicensed Bandwidth Communication Interface Card 130 memory 140 User Interfaces 150 display units 200 base stations 210 processors 220 Communication Module 221, 222 Cellular communication interface card 223 Unlicensed Bandwidth Communication Interface Card 230 memory

Claims

1. User equipment (UE) of a wireless communication system, Communication module and A processor configured to control the aforementioned communication module Equipped with, When the UE's second physical uplink data channel transmission is scheduled to a time-frequency resource on which the UE's first physical uplink data channel uplink control information (UCI) transmission is scheduled, the processor is configured to transmit the UCI to the base station of the wireless communication system within a time-frequency resource other than the time-frequency resource on which the UE's second physical uplink data channel transmission is scheduled. User equipment.

2. The UE according to claim 1, wherein the processor is configured to determine whether to transmit the UCI according to the type of the UCI.

3. The aforementioned processor, When the type of the UCI is Hybrid Automatic Retransmission Request (HARQ)-ACK, the UCI is sent. When the type of the UCI is channel status information (CSI) portion 1 or CSI portion 2, the UCI is configured to be omitted from transmission. The UE according to claim 2.

4. The aforementioned processor, When the type of the UCI is a Hybrid Automatic Retransmission Request (HARQ)-ACK or Channel Status Information (CSI) portion 1, the UCI is transmitted. When the type of the UCI is CSI portion 2, the UCI is configured to omit transmission. The UE according to claim 2.

5. User equipment (UE) of a wireless communication system, Communication module and A processor configured to control the aforementioned communication module Equipped with, When the physical uplink data channel transmission of the UE is scheduled within the time-frequency resources in which the physical uplink control channel transmission of the UE is scheduled, the processor is configured to transmit uplink control information (UCI) of the physical uplink control channel to the base station of the wireless communication system. User equipment.

6. The UE according to claim 5, wherein when the physical uplink data channel transmission of the UE is scheduled within the time-frequency resources in which the physical uplink control channel transmission of the UE is scheduled, the processor is configured to determine whether to transmit the UCI according to the type of UCI.

7. The aforementioned processor, When the type of the UCI is HARQ-ACK, the UCI is transmitted. If the type of the UCI is not HARQ-ACK, the UCI is not transmitted. The UE according to claim 6.

8. The UE according to claim 5, wherein when the UE's physical uplink data channel transmission is scheduled within the time-frequency resource in which the UE's physical uplink control channel transmission is scheduled, the processor is configured to transmit the physical uplink control channel by puncturing a time resource within the time-frequency resource in which the UE's physical uplink control channel transmission is scheduled that overlaps with the time resource in which the UE's physical uplink data channel transmission is scheduled.

9. The UE according to claim 5, wherein when the physical uplink data channel transmission of the UE is scheduled within the time-frequency resource in which the physical uplink control channel transmission of the UE is scheduled, the processor is configured to transmit the physical uplink data channel by puncturing the physical uplink data channel of the UE, which is scheduled within the time-frequency resource in which the transmission of the physical uplink control channel is scheduled.

10. The processor is configured to transmit the UCI of the physical uplink control channel among the N symbols following the time-frequency resource transmitted therein, N is a natural number. The UE according to claim 5.

11. User equipment (UE) of a wireless communication system, Communication module and A processor configured to control the aforementioned communication module Equipped with, When the transmissions of the first physical uplink channel and the second physical uplink channel of the UE are scheduled within a single symbol, The processor is configured to transmit the first physical uplink control channel within a time-frequency resource in which the first physical uplink control channel is scheduled, and to transmit the second physical uplink control channel within another time-frequency resource in which the first physical uplink control channel does not overlap with the scheduled time-frequency resource. User equipment.

12. The UE according to claim 11, wherein the processor is configured to select another time-frequency resource from among the plurality of time-frequency resources based on the position in a slot of the last symbol of each of the plurality of time-frequency resources configured for transmission of a physical uplink control channel.

13. The UE according to claim 12, wherein the processor selects another time-frequency resource by considering the position of the last symbol of each of the plurality of time-frequency resources, and then considering the number of symbols of each of the plurality of time-frequency resources.

14. The UE according to claim 11, wherein the processor is configured to select as another time-frequency resource a time-frequency resource having the same or earlier last symbol as the latest symbol among the time-frequency resources on which the transmission of the first physical uplink control channel is scheduled and among the time-frequency resources on which the transmission of the second physical uplink control channel is scheduled.

15. The UE according to claim 11, wherein the processor is configured to determine the first physical uplink control channel and the second physical uplink control channel from the two physical uplink control channels, based on the fact that downlink control information (DCI) indicates a transmission of at least one of two physical uplink control channels, including the first physical uplink control channel and the second physical uplink control channel.

16. The UE according to claim 15, wherein the processor is configured to determine the first physical uplink control channel and the second physical uplink control channel among the two physical uplink control channels based on the type of uplink control information (UCI) for each of the two physical uplink control channels.

17. The UE according to claim 16, wherein the processor is configured to determine, among the two physical uplink control channels, the physical uplink control channel whose UCI type is Hybrid Auto Request (HARQ)-ACK as the first physical uplink control channel, and to determine, among the two physical uplink control channels, the physical uplink control channel whose UCI type is Channel State Information (CSI) as the second physical uplink control channel.

18. User equipment (UE) of a wireless communication system, Communication module and A processor configured to control the aforementioned communication module Equipped with, When the authorization-based physical uplink data channel transmission by the UE is scheduled within the time-frequency resources in which the authorization-less physical uplink data channel transmission by the UE is scheduled, and there is data to be transmitted through the authorization-less physical uplink data channel, the processor is configured to skip the authorization-based physical uplink data channel transmission and transmit the authorization-less physical uplink data channel. User equipment.

19. The UE according to claim 18, wherein when the authorization-based physical uplink data channel is dropped and the unauthorized physical uplink data channel is transmitted, the processor is configured to transmit uplink control information (UCI) that should be transmitted through the authorization-based physical uplink data channel through the unauthorized physical uplink data channel.

20. The UE according to claim 18, wherein when there is data to be transmitted through the unauthorized physical uplink data channel and the transmission period of the unauthorized physical uplink data channel is shorter than a certain period, the processor is configured to skip the permission-based physical uplink data channel transmission and transmit the unauthorized physical uplink data channel.

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