Method and device for multi-band single-carrier transmission in millimeter wave wireless communication system

Abstract

The present invention relates to a communication method and system for integrating a fifth generation (5G) communication system supporting a higher data rate than a fourth generation (4G) system with Internet of Things (IoT) technology. The present invention can be applied to smart services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected cars, health care, digital education, smart retail, safety and security services. A method performed by a base station includes identifying configuration information for single-carrier signal transmission, sending single-carrier signal transmission configuration information to a terminal, sending control information for scheduling data transmission, and sending data to the terminal using a single carrier according to the single-carrier signal transmission configuration information and the control information. The single-carrier signal transmission configuration information includes at least one of offset or comb information indicating a resource to which the terminal can be scheduled, frequency resource information of a bandwidth portion, and subcarrier spacing information.

Description

Technical Field

[0001] The embodiments of the present invention relate to a method and apparatus for communication between a base station and a terminal in a millimeter wave wireless communication system, and more specifically, to a method for a base station to multiplex multiple terminals to a single carrier while using multiple frequency bands. In addition, the embodiments of the present invention are used for a base station to perform single-carrier transmission while occupying a flexible frequency band. Background Art

[0002] In order to meet the demand for wireless data communication services that has increased since the commercialization of 4G communication systems, efforts have been made to develop improved 5G communication systems or quasi-5G communication systems. Therefore, 5G communication systems or quasi-5G communication systems are also referred to as super 4G networks or post-LTE systems. In order to achieve high data transmission rates, 5G communication systems are being considered for implementation in mmWave segments (e.g., 60GHz bands). In 5G communication systems, technologies such as beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are being discussed as a means of reducing propagation path loss in mmWave segments and increasing propagation transmission distances. In addition, 5G communication systems have developed technologies such as evolved small cells, advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device communications (D2D), wireless backhaul, mobile networks, collaborative communications, coordinated multipoints (CoMP), and reception interference elimination to improve system networks. In addition, 5G systems have developed advanced coding modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA).

[0003] Meanwhile, the Internet has evolved into an Internet of Things (IoT) network, in which distributed components (such as objects) exchange and process information from a human-oriented connected network, in which humans generate and consume information. Internet of Everything (IoE) technology, which combines big data processing technology with IoT technology through connection with cloud servers, etc., has emerged. In order to realize IoT, technical factors such as sensing technology, wired / wireless communication, network infrastructure, service interface technology, and security technology are required, and research on technologies such as sensor networks for connection between objects, machine-to-machine (M2M) communication, and machine-type communication (MTC) has been conducted recently. In the IoT environment, by collecting and analyzing data generated by connected objects, intelligent Internet technology (IT) services can be provided to create new value for people's lives. IoT can be applied to smart homes, smart buildings, smart cities, smart cars, connected cars, smart grids, health care, smart home appliances, high-tech medical services, etc. through the integration of traditional information technology (IT) and various industries.

[0004] Therefore, various attempts have been made to apply 5G communication to IoT networks. For example, 5G communication technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have been implemented through technologies such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology may be an example of the fusion of 5G technology and IoT technology.

[0005] Generally, mobile communication systems are developed to provide communication while ensuring user mobility. Due to the rapid development of technology, such mobile communication systems have reached a state where they can provide both high-speed data communication services and voice communication. In recent years, the Third Generation Partnership Project (3GPP), as one of the next-generation mobile communication systems, is working on the specification research of the new wireless communication system (NR). The NR system is being developed to meet various network requirements and achieve a wide range of performance goals. In particular, the NR system is a technology for achieving communication in the millimeter wave band (6GHz to 100GHz).

[0006] Hereinafter, the NR system may be understood to include a 5G NR system, a 4G LTE system, and an LTE-A system that supports microwaves, including millimeter wave band communications in 6 GHz or higher frequency bands. The NR system may be mixed with a fifth generation (5G) communication system. Thus, the NR frequency range (FR) 1 system is a 5G system that supports 6 GHz or less, the NR FR2 system is a 5G system that supports 6 GHz or more and 60 GHz or less, and the NR FR3 system is 60 GHz or more and 100 GHz or less. The embodiments of the present invention described below may be mainly applied to NR FR3, but may also be applied to other systems.

[0007] The above information exists only as background information to assist in understanding the present invention. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art to the present invention. Summary of the invention

[0008] Technical issues

[0009] In the 6 GHz or higher millimeter wave (mmWave) band that can support the NR system, high-power signal transmission is required to strengthen the high path loss and signal attenuation between the base station and the terminal. In this case, since it is difficult to use multi-carrier transmission technology, the present invention proposes a method and apparatus for effectively supporting user multiplexing and sending and receiving signals using a single carrier in the millimeter wave band.

[0010] Technical Solution

[0011] According to the present invention, a method for transmitting multiple terminals in different frequency bands with a single carrier includes at least one of the following: determining a preferred frequency band for each user; determining a ratio of samples occupied by multiple terminals in one symbol; determining the positions occupied by samples of a data channel sent to multiple terminals in one symbol; determining the power of samples occupied by multiple terminals in one symbol; determining a single carrier occupied bandwidth based on the allowed bandwidth of the terminal; configuring one or more single carrier occupied bandwidths based on the allowed bandwidth of the terminal and indicating one or more terminals; interleaving resources available to each terminal so that terminals occupying different frequency bands occupy orthogonal time in single carrier transmission in one base station; when terminals occupying the same frequency band in one or more base stations perform single carrier transmission, interleaving resources that can transmit signals of each terminal to reduce interference; exchanging information with terminals or / and adjacent base stations so that terminals occupying overlapping frequency bands in one or more base stations transmit signals without interference when performing communication using different subcarrier spacings; multiplexing supporting one or more reference signals in one symbol to maintain a single carrier, including at least a reference signal, a control signal and a data signal in one symbol to reduce transmission delay; and configuring one or more single carrier frequency bands in one symbol to transmit one or more beams, and making the symbols non-overlapping.

[0012] In addition, a signal transmission method of a base station of a wireless communication system includes: identifying configuration information for single-carrier signal transmission; sending the single-carrier transmission configuration information to a terminal; sending control information for scheduling data transmission; and sending data to the terminal using a single carrier based on the single-carrier transmission configuration information and the control information, wherein the single-carrier transmission configuration information includes at least one of offset or comb information indicating resources to which the terminal can be scheduled, frequency resource information of a bandwidth portion, and subcarrier spacing information.

[0013] In addition, a signal receiving method of a base station of a wireless communication system includes: receiving configuration information for single-carrier signal transmission from a base station; receiving control information for scheduling data transmission; and receiving data from the base station using a single carrier based on the single-carrier transmission configuration information and the control information, wherein the single-carrier transmission configuration information includes at least one of offset or comb information indicating resources to which a terminal can be scheduled, frequency resource information of a bandwidth portion, and subcarrier spacing information.

[0014] In addition, the base station of the wireless communication system includes: a transceiver; and a controller, connected to the transceiver and configured to: identify configuration information of single-carrier signal transmission, send the single-carrier transmission configuration information to the terminal, send control information for scheduling data transmission, and send data to the terminal using a single carrier based on the single-carrier transmission configuration information and the control information, wherein the single-carrier transmission configuration information includes at least one of offset or comb information indicating resources to which the terminal can be scheduled, frequency resource information of a bandwidth portion, and subcarrier spacing information.

[0015] In addition, the terminal of the wireless communication system includes: a transceiver; and a controller for controlling the reception of configuration information for single-carrier signal transmission from a base station; receiving control information for scheduling data transmission; and receiving data from the base station using a single carrier based on the single-carrier transmission configuration information and the control information, wherein the single-carrier transmission configuration information includes at least one of offset or comb information indicating the resource to which the terminal is scheduled, frequency resource information of the bandwidth part, and subcarrier spacing information.

[0016] Before proceeding to the following detailed description, it may be helpful to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprising," and their derivatives, mean including but not limited to; the term "or" is inclusive, meaning and / or; the phrases "associated with" and "associated with," and their derivatives, may mean including, included within, interconnected, containing, contained within, connected to or connected with, coupled to or coupled with, communicable, cooperating, interwoven, juxtaposed, proximate, bound to or bound with, having, having the property of, and the like; and the term "controller" means any device, system, or portion thereof that controls at least one operation, such device may be implemented in hardware, firmware, or software, or some combination of at least two thereof. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0017] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a portion thereof that are suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store data and rewrite it later, such as rewritable optical disks or erasable storage devices.

[0018] Definitions for certain words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most, instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

[0019] Beneficial Effects

[0020] According to an embodiment of the present invention, a base station can use a single carrier of one symbol to simultaneously support terminals occupying different frequency bands. In addition, the terminal can receive signals between users using the same beam without interference, or can receive signals from adjacent cells using the same bandwidth without interference, thereby improving the reliability of data transmission.

[0021] According to an embodiment of the present invention, a base station can effectively send signals to multiple terminals via a single carrier, and also improve system performance by sending signals via a preferred frequency band for each terminal. In addition, according to an embodiment of the present invention, a base station can maintain coverage by sending a single carrier signal to each terminal in a frequency band preferred by one or more terminals using the same analog beam. In addition, according to an embodiment of the present invention, a base station can pre-configure or adjust the time domain of samples occupied by a terminal on a symbol, and can send signals so that samples of each terminal do not overlap in the time domain between terminals. In addition, according to an embodiment of the present invention, a base station can support single carrier transmission regardless of the size of the maximum allowed frequency band of the terminal and the frequency domain of the data channel actually sent.

[0022] In addition, according to an embodiment of the present invention, the base station may pre-configure one or more candidates for a single-carrier transmission bandwidth in the terminal and perform data scheduling so that the base station can change dynamically or semi-dynamically. In addition, according to an embodiment of the present disclosure, the base station may consider the sample occupancy time in the frequency band or symbol allocated by the terminal to adjust the power density sent to the terminal without considering the frequency band. In addition, according to an embodiment of the present disclosure, the base station may be configured so that samples of a data channel sent to one or more terminals are distributed in a symbol but are sent so as not to overlap with samples of data channels of other terminals.

[0023] In addition, according to an embodiment of the present invention, when one or more base stations occupy the same frequency band and send signals at the same time, interference can be randomized so that there are only some overlapping samples (on the time axis) between the terminals scheduled by the corresponding base stations. In addition, according to an embodiment of the present invention, when one or more base stations using different subcarrier spacings occupy the same frequency band and send signals, the base station can send signals without interference. In addition, according to an embodiment of the present invention, in order to send a reference signal for supporting one or more terminals to occupy different frequency bands, the base station can use the offset of the virtual resource index differently in the frequency band used by each terminal to prevent interference.

[0024] In addition, according to an embodiment of the present invention, the base station may perform reference signal transmission for supporting one or more terminals to occupy different frequency bands. In addition, according to an embodiment of the present invention, the base station may multiplex and send at least one of a reference signal, a control channel, and a data channel to one symbol for one or more terminals to occupy different frequency bands. In addition, a base station according to an embodiment of the present invention may send a signal using different samples in one or more frequency bands using different analog beams in one symbol. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] For a more complete understanding of the present invention and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0026] Figure 1 is a diagram showing a communication system that transmits and receives data between a base station and a terminal;

[0027] Figure 2 is a diagram showing an example of a downlink multi-band single-carrier transmission method proposed by the present invention;

[0028] Figure 3 is a view showing a method for allocating time and frequency resources according to the multi-band single-carrier transmission method proposed by the present invention;

[0029] Figure 4is a diagram showing an apparatus for configuring time sample resources and frequency resources in a multi-band single-carrier transmission system proposed by the present invention;

[0030] Figure 5 is a diagram showing a method for configuring time sample resources and frequency resources in a multi-band single-carrier transmission system proposed by the present invention;

[0031] Figure 6 is a view showing a method for configuring a single carrier bandwidth and a terminal bandwidth to be the same in a multi-band single carrier transmission system proposed by the present invention;

[0032] Figure 7 is a diagram showing a method proposed by the present invention for configuring a single carrier bandwidth to be larger than a terminal bandwidth in a multi-band single carrier transmission system;

[0033] Figure 8 is a view showing a method for configuring one or more single carrier bandwidths within a bandwidth of a terminal in a single carrier transmission system proposed by the present invention;

[0034] Fig. 9 is a diagram showing another method proposed by the present invention for configuring one or more single carrier bandwidths within the bandwidth of a terminal in a multi-band single carrier transmission system;

[0035] Fig.10 is a diagram showing a first method proposed by the present invention for uniformly configuring average power between symbols in multi-band single-carrier transmission;

[0036] Fig.11 is a view showing a second method for differently configuring transmission power in symbols in multi-band single-carrier transmission proposed by the present invention;

[0037] Fig.12 is a diagram showing a multiplexing method proposed by the present invention for minimizing interference of signals of one or more multiple terminals transmitted simultaneously in multi-band single-carrier transmission;

[0038] Fig.13 is a diagram illustrating a method for controlling interference between different terminals in multi-band single-carrier transmission proposed by the present invention;

[0039] Fig.14 is a diagram showing an interference control method between base stations when one or more base stations using a multi-band single-carrier transmission scheme proposed by the present invention use different subcarrier spacings;

[0040] Fig.15A is a diagram showing a structure for transmitting one or more different channels in different symbols in multi-band single-carrier transmission proposed by the present invention;

[0041] Fig. 15B is a diagram showing a packet structure for multiplexing and transmitting one or more different channels in one symbol in multi-band single-carrier transmission proposed by the present invention;

[0042] Fig.16A It is a diagram showing a packet structure for multiplexing and sending one or more different channels in one symbol in order to reduce transmission delay time in multi-band single-carrier transmission proposed by the present invention;

[0043] Fig. 16B is a view showing a method for multiplexing different channels in one symbol;

[0044] Fig.17 is a diagram showing a grouping structure proposed by the present invention for a case where a control channel and a data channel occupy different frequency bands in multi-band single-carrier transmission;

[0045] Fig.18 is a diagram showing a method for transmitting one or more beams to one symbol in multi-band single-carrier transmission proposed by the present invention;

[0046] Fig.19 is a view showing a method for performing beam detection by transmitting one or more beams to one symbol in multi-band single-carrier transmission proposed by the present invention;

[0047] Fig. 20A is a diagram showing a single carrier frequency band configuration method proposed by the present invention;

[0048] Fig. 20B is a diagram showing another single carrier frequency band configuration method proposed by the present invention;

[0049] Fig.21 is a diagram showing an example of the operation of a base station for performing the present invention;

[0050] Fig. 22 is a view showing an example of the operation of a terminal for executing the present invention;

[0051] Fig.23 is a diagram showing a base station device capable of performing the present invention; and

[0052] Fig.24 is a diagram showing a terminal device capable of executing the present invention. DETAILED DESCRIPTION

[0053] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0054] When describing the embodiments, the description of technical contents that are well known in the technical field to which the embodiments of the present disclosure belong and are not directly related to the embodiments of the present disclosure will be omitted. The omission of such unnecessary description is intended to prevent the subject idea of ​​the present disclosure from being unclear and to convey the subject idea more clearly.

[0055] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In each figure, the same or corresponding components are given the same reference numerals.

[0056] By referring to the embodiments of the present invention described in detail below in conjunction with the accompanying drawings, the advantages and features of the present invention and the methods for achieving these advantages and features will be apparent. However, the present disclosure is not limited to the embodiments of the following inventions, but can be embodied in various forms, and for those skilled in the art to which the present disclosure belongs, only embodiments are provided to make the present disclosure complete. It is provided to fully inform the scope of the present disclosure, and the present disclosure is limited only by the scope of the claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0057] Here, it should be understood that each block of the flowchart diagram and the combination of blocks in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a method for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable memory or a computer-readable memory, and can instruct the computer or other programmable data processing device to operate in a specific manner so that the instructions stored in the computer-usable memory or the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on the computer or other programmable device to generate a computer-implemented process, so that the instructions running on the computer or other programmable device provide steps to implement the functions specified in one or more flowchart blocks.

[0058] Furthermore, each block of the flowchart diagram may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions noted in the blocks may not occur in order. For example, two blocks shown in succession may actually be run substantially concurrently, or blocks may sometimes be run in reverse order depending on the functions involved.

[0059] The term "unit" used in the embodiment refers to a software or hardware component such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and the "unit" works. However, "unit" does not always have the meaning of being limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by the "unit" can be combined into a smaller number of elements, "units", or divided into a larger number of elements, "units". In addition, elements and "units" can be implemented to reproduce one or more CPUs in a device or a secure multimedia card. In addition, in one embodiment, "unit" can include one or more processors.

[0060] An embodiment of the present invention is used in a communication system for sending a downlink signal from a base station to a terminal in an NR system. The downlink signal of NR includes a data channel through which information is sent, a control channel through which control information is sent, and a reference signal (RS) for channel measurement and channel feedback.

[0061] The NR base station can send data information and control information to the terminal via the physical downlink shared channel (PDSCH) and the physical downlink control channel (PDCCH), respectively. PDSCH is a downlink data transmission channel of the physical layer, and PDCCH is a downlink control information transmission channel of the physical layer. In the following, PDSCH transmission and reception can be understood as data transmission and reception on PDSCH, and PDCCH transmission and reception can be understood as transmission and reception of control information on PDCCH.

[0062] The NR base station may have multiple reference signals, and the multiple reference signals may include at least one of a channel state information RS (CSI-RS) and a demodulation reference signal and a terminal-specific reference signal (DMRS). The NR base station sends a terminal-specific reference signal (DMRS) only to an area scheduled to send data, and sends CSI-RS on the time and frequency axis to obtain channel information for data transmission. The reference signals described below may include two types of reference signals.

[0063] In the following, the base station as an object of performing resource allocation of the terminal may be at least one of a gNode B (gNB), an eNode B (eNB), a Node B, a base station (BS), a radio access unit, a base station controller, and a node on a network. In addition, the base station may be mixed with a transmission and reception point (TxRP or TRP). The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication. In addition, in the following, higher layer signaling (or higher layer signaling) may mean a medium access control element (MAC CE) or a radio resource control (RRC) signaling (which may include a master information block (MIB) or a system information block (SIB)) instead of a physical layer signaling. In addition, the physical layer signaling may mean being included in the downlink control information and being sent on the PDCCH.

[0064] In wireless communication systems, the communication between base stations and terminals is closely affected by the radio wave environment. Especially in the 60MHz frequency band or higher, the signal attenuation is large due to moisture and oxygen in the air, and the signal transmission is very difficult due to the small scattering effect caused by the small wavelength. Therefore, the base station must send signals at a higher power to achieve cell coverage similar to that of base stations using frequency bands below 60MHz, and multi-carrier transmission technology, which shows excellent performance in overcoming multipath delay effects in 4G systems when sending signals at higher transmission power, is difficult to use due to the high peak-to-average power ratio (PAPR). In the case of multi-carrier, the dynamic changes of a large number of time symbols use a back-off configured with low transmission power to maintain the linear region of the transmission power amplifier. Therefore, in frequency bands where high power is used to overcome path attenuation, signal transmission using a single carrier is more appropriate than signal transmission using multiple carriers.

[0065] However, when single-carrier transmission is performed to use higher transmission power, user multiplexing is difficult, and the channel estimation performance and the channel estimation performance of multipath signals are reduced. In addition, in millimeter waves, in order to overcome high path loss, it can be mixed with an analog beam (hereinafter referred to as a beam), and can be understood as a directional signal in this specification. The transmit beam in the present invention can be understood as a signal to which a spatial domain transmit filter is applied, and the receive beam can be understood as a signal to which a spatial domain receive filter is applied. The beam in the present invention can be understood as a signal to which analog beamforming or / and digital beamforming is applied. The length of the millimeter wave wavelength is very short, so the bandwidth of the analog beam is reduced, which makes multi-user support more difficult. Therefore, for systems using millimeter waves, it is difficult to ensure that the system performance reaches the technical level used in the microwave frequency band.

[0066] Therefore, the present invention proposes a method and apparatus for effectively supporting user multiplexing using a single carrier in a millimeter wave band. In particular, a base station operates a single carrier and uses a different frequency band for each user.

[0067] Figure 1 is a diagram showing a communication system that transmits and receives data between a base station and a terminal.

[0068] refer to Figure 1 , the transmitter 100 is a system capable of orthogonal frequency division multiplexing (OFDM) transmission, and can transmit a single carrier (SC) in a bandwidth capable of OFDM transmission. The transmitter 100 may include a serial-to-parallel (SP) converter 103, a single carrier preprocessor 105, an inverse fast Fourier transform (IFFT) unit 107, a parallel-to-serial (PS) converter 109, a cyclic prefix (CP) inserter 111, an analog signal unit 113 (which may include a digital-to-analog converter and RF) and an antenna module 115.

[0069] Data 101 of size M (data sequence of size M in a vector) that has been channel coded and modulated is converted into a parallel signal in a serial-to-parallel converter 103, and then converted into an SC waveform (hereinafter referred to as SCW) by an SC preprocessor 105. The device for converting a parallel signal into an SCW can be implemented in a variety of ways, including using a discrete Fourier transform (DFT) preprocessor, up-conversion, code extension, etc. The present invention may include various preprocessing methods, and for the sake of understanding, the following description will be based on an SCW generation method using a DFT preprocessor. However, when the SCW is generated by other methods, the embodiments of the present invention can be used in the same manner.

[0070] Here, the size of the DFT is equal to M, and the data signal that has passed through the DFT preprocessor (or DFT filter) of length M is converted into a broadband frequency signal by the N-point IFFT 107 processor. The N-point IFFT processor processes the signal on each subcarrier of the transmission channel bandwidth divided into N subcarriers. However, since the DFT preprocessing of length M is performed before the N-point IFFT processor, a single carrier is used to transmit the signal transmitted after the IFFT based on the center carrier of the bandwidth to which the signal after the length M DFT preprocessing is mapped. Through the processing of the parallel-serial processor 109, the data processed in the N-point IFFT 107 is stored as N samples, some of which are copied and concatenated after the N samples. This processing is performed in the CP insertion unit 111.

[0071] Thereafter, the signal is sent to the analog signal unit 113 through a pulse shaping filter such as a raised cosine filter, converted into an analog signal through a digital-to-analog conversion process such as an amplifier (power amplifier (PA)), transmitted to the antenna module 115 and radiated to the atmosphere.

[0072] The general SCW signal is mapped to M pre-processed signals to the desired M consecutive subcarriers, such as Figure 1 As shown in 107. Therefore, the size of M is determined according to the size of the transmitted data or the amount of time symbols used by the transmitted data. The size of M is usually much smaller than N because the characteristic of SCW is a signal with a small peak-to-average power ratio (PAPR).

[0073] PAPR indicates the magnitude of the variation in the transmission power of samples of the transmitted signal. A larger PAPR means a larger dynamic range of the transmitter's PA, which means a larger power margin for operating the PA. In this case, the transmitter configures a higher available PA margin to prepare for the possibility of large variations in transmission power, thereby reducing the maximum strategy available to the transmitter, which in turn reduces the maximum possible communication distance between the transmitter and the receiver. On the other hand, in the case of an SCW with a small PAPR, the variation in the PA id is very small, so even if the margin is configured to be small, operation of the PA is possible, and thus the maximum communication distance increases.

[0074] In the case of millimeter wave wireless communication systems, maintaining the communication distance is important because the radio wave attenuation is high. Therefore, it is advantageous for the base station to use a technique such as SCW for increasing the maximum communication distance. Generally, since SCW has a smaller PAPR than a multi-carrier waveform (MCW), it has a higher margin of 5 to 6 dB, which allows the transmitter to use a higher maximum transmission power than an MCW transmitter, resulting in an increased maximum communication distance. Figure 1 The SCW shown is generally used in terminals with lower maximum transmission power, such as uplink, and is particularly used for uplink transmission of LTE systems. In particular, since the terminal lacks the power of uplink transmission, the terminal cannot configure the size of M in large quantities, and due to insufficient transmission power, the communication distance can be maintained by reducing M.

[0075] In addition, since the base station receives a signal transmitted by one terminal, the uplink does not need to consider the case where one or more terminals transmit signals using the same single carrier. On the other hand, in the case of a millimeter wave wireless system, power shortage occurs in the downlink due to radio wave attenuation. In the case of downlink transmission, support for this is necessary because simultaneous signal transmission to one or more terminals of the base station is necessary.

[0076] Figure 22 is a diagram showing an example of a downlink multi-band single-carrier transmission method 200 proposed by the present invention.

[0077] refer to Figure 2 The multi-band single-carrier transmission method proposed in the present invention is a method for compensating for the frequency selective transmission difficulties of the traditional single-carrier transmission method. The data sent to one or more terminals is sent via a preferred frequency band, wherein the signal sent to the terminal can be sent with the same waveform as the single-carrier transmission to ensure coverage. To this end, the proposed method is as follows.

[0078] When the base station transmits two different data streams (such as 201 and 203), first, each data stream 201 and 203 passes through the serial-to-parallel converters 205 and 225, respectively, and then is mapped to the DFT preprocessor 207 of M1 size and the DFT preprocessor 227 of M2 size, respectively, to fit each occupied bandwidth. At this time, the sample area should be determined by applying offset #1221 and offset #2223 so that the data stream #1201 and the data stream #2203 do not overlap each other in the time sample after passing through the serial-to-parallel converter 211. When the size of the DFT is M1, the size of the virtual resource used to transmit the data stream #1201 (or the size of the virtual resource can be understood as the ratio of the virtual resource) is M1 / (M1+M2), and when the size of the DFT is M2, the size of the virtual resource used to transmit the data stream #2203 is M2 / (M1+M2). If M1 and M2 have the same size, data stream #1 201 and data stream #2 203 each occupy half of the virtual resource. After passing through the parallel-to-serial converter 211, the data stream passes through the CP insertion unit 213, is sent to the analog signal unit 215, and the data stream is sent from the antenna panel 217 connected to the FPGA 219.

[0079] If it is generalized, it is as follows: When ML-size DFT preprocessing is applied to each of L data streams, the length P1 of the virtual resource occupied by the first terminal is represented by Equation 1 below.

[0080] [Equation 1]

[0081] P 1 =M 1 / (M 1 +M 2 +...+M L )

[0082] Here, generation of a data channel using DFT-s-OFDM (DFT-spread-OFDM) can be expressed as follows.

[0083] if is called a data symbol to be transmitted in one OFDM symbol, and x(0), ..., x(P1 -1) is a modulated symbol to be transmitted in one OFDM symbol, then for each terminal, xx can be expressed as follows. In the following equation, when the modulation symbol is mapped to the DFT preprocessor, when the offset is applied to the low index part, or when the offset shift occurs at the beginning of the xx symbol ( Figure 2 offset #2223 in the xx symbol), the former is applied; and when the modulation symbols are mapped to the DFT preprocessor, when the offset is applied to the high index part, or when the shift by the offset occurs at the end of the xx symbol ( Figure 2 offset #1221), use the latter expression.

[0084] xx(offset),...,xx(P 1 -1+offset)=x(0),...,x(P 1 -1), or

[0085]

[0086] The frequency band symbol y converted into SC through DFT-S-OFDM (ie, through a DFT preprocessor) can be expressed by Equation 2 as follows.

[0087] Equation 2

[0088]

[0089]

[0090] l=O,...,L-1

[0091] Here, Indicates the size of the resources occupied by PDSCH in the PRB unit and is equal to the bandwidth length occupied by a single carrier. I refers to the symbol index. Here, Open and The present invention is applicable to all equations that produce the same y, including the above method.

[0092] The size of the offset may be a predetermined value according to the above rules, and the value may be indicated by higher layer signaling. For example, when mapping modulation symbols to consecutive symbols, information about whether the offset shift occurs at the beginning or end of the xx symbol may be indicated in advance by higher layer signaling, or may be indicated via a control channel such as PDCCH.

[0093] The method of using the offset includes not only the method of using the continuous offset as described above, but also the method of configuring the random offset and the method of using the offset separated by equal intervals. In the case of using the offset to separate the symbols for data transmission at continuous equal intervals, the base station can indicate the terminal about the position of the interval for receiving each data channel and the information about the interval for resource allocation. For example, if two users receive a signal using a single carrier transformed by DFT of M1=M2=M, the base station can configure the interval for resource allocation to, for example, 2, and configure the position for receiving each data channel to 0 or 1 to send it to each terminal. For example, if the interval is 2, the two configurations of the M virtual resources can be configured with indexes of 0, 2, 4, ..., M-2 and 1, 2, 3, ..., M-1. If the base station indicates that user 1 indicates position 0 and user 2 indicates position 1, the symbol of user 1 is mapped to indexes 0, 2, 4, ..., M-2 in the virtual resource index, and user 2 is mapped to indexes 1, 3, 5, ..., M-1 in the virtual resource index, so that the base station can send signals while maintaining the characteristics of a single carrier.

[0094] Even when the DFT sizes M1 and M2 are different, the symbols of each terminal can use virtual resources that do not overlap with each other by calculating the interval of time samples. For example, when M1=2M2, the length of the continuous allocated resources of the terminal (hereinafter referred to as terminal 1) that sends a signal using the DFT size M1 can be configured to be twice the length of the allocated resources of the terminal (hereinafter referred to as terminal 2) that sends a signal using the DFT size M2. For example, when M1=4 and M2=2, terminal 1 can use two continuous resources, while terminal 2 can use one continuous resource. When terminal 1 uses resource interval 0, terminal 1 occupies the first (two) virtual resources, and terminal 2 uses resource interval 1 so that terminal 2 occupies the second virtual resource. That is, the amount of the first virtual resource occupied by terminal 1 is equal to the amount of the second virtual resource occupied by terminal 2. The first virtual resource is divided into two virtual resources, so that 2n symbols of terminal 1 are assigned to the first virtual resource, and n symbols of terminal 2 are mapped to the second virtual resource. In this case, since the time in the time symbol of terminal 1 corresponding to the first (two) virtual resources and the time of terminal 2 in the time symbol corresponding to the second resource do not overlap, a single carrier can be maintained.

[0095] Figure 3 is a diagram illustrating a method for allocating time and frequency resources according to a multi-band single-carrier transmission method proposed in the present invention.

[0096] refer to Figure 3 , reference numeral A 300 indicates input to Figure 2The virtual resources of the DFT preprocessors 207 and 227 in FIG. 1 are shown in FIG. Figure 2 The frequency band symbols processed by the N-point IFFT 209 after the DFT preprocessing in FIG. 1 and the reference numeral C 320 denotes the ... Figure 2 The samples of the time symbols after the parallel-to-serial conversion 211 in . Reference numeral 301 is the channel bandwidth operated by the cell accessed by the terminal, which can be referred to as the FFT size used by the terminal. Figure 3 , axis 302 represents a virtual resource region in terms of resource elements (REs). REs refer to resources corresponding to one OFDM symbol on the time axis and one subcarrier region on the frequency axis. Reference numeral 303 represents a data symbol x of UE#1 mapped to a virtual resource, and reference numeral 305 represents a data symbol x of UE#2 mapped to a virtual resource. Data sent to UE#1 is mapped to consecutive P 1 Virtual resources, such as 303; and offset #1 304, which is the difference from the DFT size M1 307, is configured as null or zero. Similarly, it can be seen that the data sent to UE #2 is configured as NULL or 0 through consecutive offsets #2 306 on the virtual resources and mapped to the remaining P 2 The fragment is shown as 305. At this time, offset #2 306 and P 2 The sum of 305 becomes the DFT size M2 309.

[0097] When the resource region Pi and the offset #i region are configured as a ratio of M1 and M2, when the OFDM symbol 311 is observed in units of samples, the sample sent to the terminal #1 occupies the time region 313 of T1. The sample sent to the terminal #2 occupies the time region 315 of T2. As a result, a signal for one or more terminals is sent to one OFDM symbol, and at the same time, the base station can use the frequency band preferred by each terminal to send the signal. In addition, since the signals of one or more terminals do not overlap with each other in the time sample, no increase occurs in the PAPR, and therefore, two terminals can be supported using one symbol. The embodiment described in the present invention is a case of two terminals, but the method can be generally applied to N terminals.

[0098] In addition, the above method can be applied to the case where one terminal uses more than one single carrier frequency band. By replacing the above data sent to UE#1 and the data sent to UE#2 with the codeword of the data channel sent by one terminal, the base station sends CW#1 and CW#2 to one terminal. For example, the base station can use each single carrier frequency band to send the same data, such as CW#1 and CW#1 to one terminal, or the base station can send data RV1 and RV2 to one terminal according to different redundancy versions (RV) of the data channel. Although Figure 3An example of using two single carrier frequency bands is shown, but the data transmission method can be applied to the case of using any number of single carrier frequency bands. The transmission to user 1 and user 2 (or terminal 1 and terminal 2) described later can also be interpreted as an example of sending the same data signal or different data signals to one user.

[0099] Figure 4 3 is a diagram showing an apparatus for configuring time sample resources and frequency resources in a multi-band single-carrier transmission system proposed by the present invention.

[0100] refer to Figure 4 The multi-band single-carrier transmission system proposed by the present invention can use twelve parameters of k0(421), k1(401), k2(423), k3(425), k4(403), k5(427), M0(429), M1(407), M2(423), M3(433), and M4(431) to generate a signal, and the present invention includes a method and apparatus for generating a signal by adjusting at least one parameter. At least one of the parameters may also follow a predetermined rule, may be transmitted via higher layer signaling, or may be included in control information of a control channel such as a PDCCH and transmitted.

[0101] When the base station sends two different data streams 1 and 2, first, each data stream 1 and 2 passes through the serial-to-parallel converter 405, and then is mapped to the DFT preprocessor 407 of M1 size and the DFT preprocessor 423 of M2 size respectively to fit each occupied bandwidth. The data stream is processed by the N-point IFFT 409 after the DFT preprocessor 407 and 423. After passing through the parallel-to-serial converter 411, the data stream passes through the CP insertion unit 413 and is sent to the analog signal unit 415, and the data stream is sent from the antenna panel 417 and connected to the FPGA 419.

[0102] Each parameter is explained as follows. k0 421 is a parameter for clearing the initial k0 / M1 time samples in the OFDM symbol. It can be used to adjust the CP length of the transmission signal. When a predetermined CP length is used, k0=0 or k0 can be used as a predetermined fixed value. k1401 is the size of the amount of virtual resources occupied by the first terminal (which can be mixed with user 1). The resource size refers to the number of modulated symbols sent in one OFDM symbol. If the base station performs SU-MIMO transmission, the number of modulation symbols sent by multiplying the number of layers should be considered.

[0103] k2 423 is a parameter indicating the size of offset #1, which is configured so that the signals of users using different frequency bands do not overlap on the time symbol. k3 425 is a parameter indicating the size of offset #2, which is configured so that the signal of user 2 does not overlap with the signal of user 1 on the time symbol. k4 403 indicates the size of the amount of virtual resources occupied by the second terminal, that is, the number of modulation symbols sent to user 2. Here, k5 427 is a parameter indicating the size of zero samples added to prevent inter-symbol interference (ISI), which is a symbol without CP or a very short OFDM symbol.

[0104] M0 429 is a parameter for configuring a guard band of an area with a low frequency in a base station signal occupying a corresponding channel bandwidth. M1 407 is a parameter for determining the number of subcarriers occupied by user 1. It is also a DFT size applied to user 1. M2 423 is a parameter for determining the number of subcarriers occupied by user 2. It is also a DFT size applied to user 2. M3 433 is a parameter for configuring a guard band of an area with a high frequency in a base station signal occupying a corresponding channel bandwidth. M4 431 is a parameter representing the interval of bandwidths occupied by user 1 and user 2 as the number of subcarriers. The proposed operating parameters are applied to the frequency axis and the time axis to generate a signal, and the reference is made to the frequency axis. Figure 5 Describe the relationship between each parameter.

[0105] Figure 5 is a diagram showing a method for configuring time sample resources and frequency resources in a multi-band single-carrier transmission system proposed by the present invention.

[0106] refer to Figure 5 , Figure 5 An example of signal generation using signals of two terminals or two frequency bands is shown, but it can be similarly applied to signal generation using signals of one or more terminals or signal generation using two or more frequency bands. Reference numeral A500 shows an input to Figure 4 The virtual resources of the DFT preprocessors 407 and 423 in FIG. 5 are shown in FIG. Figure 4 The frequency band resource N-point IFFT 409 processed after DFT preprocessing in FIG. 409, and reference numeral C 520 shows the ... Figure 4 The samples of the time symbols after the parallel-to-serial conversion 411 in . Figure 5 In FIG. 5 , although all 12 parameters are described, it is not necessary to know all parameters based on one terminal. For example, user 1 uses at least M1 517, k1 505, and M0 515, and user 2 uses M0+M1+M4 (the sum of 515, 517, 519), M2 512, K4 511, or k3 509.

[0107] Figure 5 Shows how each parameter is associated in the time domain and the frequency domain. A case where a signal is sent that occupies two frequency bands within a channel bandwidth 501 (FFT size). At 501, the left side represents the lower frequency index and the right side represents the higher frequency index. From a frequency perspective, in order to determine the occupied bandwidth, a guard band configuration such as 525 is used, and the lowest subcarrier positioning of the frequency band occupied by M1517 can be specified via M0 515 to include the guard band. This lowest subcarrier positioning can also be specified via M1-G. Similarly, the bandwidth occupied by M2 521 can be determined by the size of the indication M0+M1+M4 or the indication M0+M1+M4-G.

[0108] In order to adjust the time resources occupied by user 1, the position of the virtual resources in M1 needs to be adjusted, and the parameters for adjusting it are k0 503, k1 505 and k2 507. Similarly, in order to adjust the time resources occupied by user 2, the position of the virtual resources in M2 needs to be adjusted, and the parameters for adjusting it are k3 509, k4 511 and k5 513. Adjusting k0 503 changes the size of T0 503 in the time symbol, adjusting k1 505 changes the size of T1 533 in the time symbol, and adjusting k2 507 and k3 509 changes the size of T2 535 in the time symbol, and adjusting k5 513 changes the size of T3 537 in the time symbol. Therefore, the time symbol area and position of a single carrier can be adjusted via these parameters.

[0109] At this time, by T 0 '(539)+T 1 '(541) is a symbol in the time axis, T 0 'Occupies M1 / M1+M2 in 1 symbol, and T 1 'In one symbol, M2 / (M1+M2) is occupied. Here, T0=T 0 '·k0 / (k0+k1), T1=T 0 '·k1 / (k0+k1), and T2=T 1 '·k4 / (k4+k5) and, T3=T 1 '·k5 / (k4+k5).

[0110] Figure 6 The diagram is a diagram showing a method for configuring a single carrier bandwidth and a terminal bandwidth to be the same in a multi-band single carrier transmission system proposed by the present invention.

[0111] refer to Figure 6, the system may include one or more bandwidths, which may include a channel bandwidth 601 having a maximum frequency bandwidth, a bandwidth part (BWP) 605, a scheduling bandwidth, etc. Here, the channel bandwidth means the maximum bandwidth that a base station can operate in a channel, and the BWP means the maximum bandwidth that a terminal can operate, which may be a part of the channel bandwidth. The scheduling frequency band refers to the bandwidth actually used for data transmission at the current scheduling time in the maximum bandwidth that a terminal can operate. Therefore, the configuration of a single carrier may also be configured in combination with the bandwidth.

[0112] Reference numerals 603 and 605 illustrate how to configure the bandwidth of the BWP and the single carrier in the same manner. In this case, after the terminal recognizes that the downlink frequency band uses a single carrier via higher layer signaling or implicitly, the terminal can transmit the single carrier by always applying the size of the bandwidth of the BWP, regardless of the use of a single bandwidth included in the BWP information configured from the base station and the scheduling bandwidth (frequency domain occupied by the PDSCH).

[0113] If the base station transmits a single carrier additionally on BWP 607 that exists in different frequency bands simultaneously, the single carrier waveform can be maintained by the following two methods. The first method is to pre-configure the available resources when setting (or configuring) the BWP, and the second method is to configure the resource allocation restrictions. The two methods are described in detail below.

[0114] The first method is to indicate the continuous length and position of the PRB resources or subcarriers that can be used for BWP configuration. The position of the available subcarriers can be known in the form of comb spacing and comb offset, which can be mixed with the offset. In addition, it can be indicated whether to interleave between PRBs and whether to interleave between subcarriers. In the case of using the first method, since the pre-allocated resources are indicated as described above, when the scheduling frequency band is indicated by PDCCH, the overhead of the control information for resource allocation sent on PDCCH can be reduced. For example, considering the case of pre-indicating continuous PRB resources, if the existing BWP consists of 12 PRBs, 12 bits are used when the control information sent on PDCCH is in the form of a bitmap. However, when the terminal receiving the control information in the BWP configuration indicates that six consecutive PRBs are used, only 6 bits of control information can be used to schedule the terminal.

[0115] If the available resources are indicated by the subcarrier comb spacing and the comb offset, when the comb spacing is 2 and the offset is 1, only the offset 1 of the two comb spacings is used, which is different from the case where 12 subcarriers can be used for the traditional PRB, so the number of available subcarriers is 6 per PRB. Therefore, when two PRBs are indicated, the amount of data sent via the two PRBs is the same as when one PRB is sent. Therefore, in the continuous resource allocation information indicated by the control channel, the information indicating one existing PRB can be interpreted as indicating two PRBs, thereby reducing the amount of control information used for resource allocation by half. Specifically, if the traditional 6-bit bitmap indicates whether each resource is allocated to 6 PRBs, it is interpreted as a bit indicating whether to allocate resources for 2 PRBs. Therefore, the 6-bit bitmap can indicate whether 12 PRBs are allocated. This method is not only applicable to bitmaps, but also to multiple resource allocation methods. In addition, even if the comb information is configured, it can be indicated whether each comb is actually used via the dynamic indication bit included in the control information sent on the PDCCH. The method proposed by the present invention has the advantage that a base station that transmits signals in more than one BWP can be used in a single carrier, but has the disadvantage that it cannot be used when the BWPs overlap on the frequency axis.

[0116] The second method is to restrict resource allocation. This method notifies the PRB usage restriction information in the PRB or the subcarrier unit in the BWP configuration information. In this case, when the scheduling frequency band information is sent by the base station in the control channel, the terminal compares the restricted information with the restricted resources. When the scheduling frequency band overlaps with the restricted resources and the scheduling frequency band information, the terminal can receive the data channel, assuming that the scheduling resources are not used and rate matching when receiving data.

[0117] The configuration method proposed based on this method is as follows. If the BWP consists of a common BWP and a dedicated BWP, for the common BWP, the size of the BWP and the bandwidth of the single carrier are configured to be the same, and for the dedicated BWP, the transmitted BWP activation information received from the common BWP can be configured to indicate whether to maintain the single carrier waveform when the dedicated BWP is activated. In other words, when the terminal accesses the system, it receives information of the common BWP or control information set (CORESET) 0 (which can be a CORESET through which the PDCCH for receiving system information is sent). At this time, it is assumed that the continuous PRBs configured in the common BWP or CORSET0 are the same as the frequency band of the single carrier, and the single carrier sent by the base station can be received. Thereafter, the terminal can determine whether to use single carrier transmission in the dedicated WP or / and receive a signal of resource configuration information using a single carrier via the BWP activation information received in the common BWP or CORESET 0.

[0118] Figure 7The diagram is a diagram showing a method proposed by the present invention for configuring a single carrier bandwidth to be larger than a terminal bandwidth in a multi-band single carrier transmission system.

[0119] refer to Figure 7 , the system may include one or more bandwidths, which may be configured as a channel bandwidth 701 having a maximum bandwidth, a bandwidth part (BWP) 707, a scheduling bandwidth, etc. Here, the channel bandwidth refers to the maximum bandwidth that a base station can operate in a channel, the BWP refers to the maximum bandwidth that a terminal can operate, and the scheduling bandwidth refers to the bandwidth actually used for data transmission at the current scheduling time of the maximum bandwidth that a terminal can operate. Therefore, the configuration of a single carrier may also be configured in combination with the bandwidth.

[0120] Figure 7 A method of configuring BWP 707 to be less than or equal to the bandwidth 703 of a single carrier is shown. That is, the bandwidth of a single carrier is independent of the bandwidth of a BWP, but the bandwidth of a single carrier includes the bandwidth of a BWP. In this case, after the terminal implicitly recognizes or recognizes via higher layer signaling that the downlink frequency band uses a single carrier, the terminal sends the single carrier by applying the size of the single carrier bandwidth, regardless of whether the single carrier is included in the single carrier configuration information configured from the base station and the scheduling bandwidth. The base station explicitly indicates the length of the time symbol occupied by the single carrier bandwidth via the BWP information included as the sub-information of the single carrier configuration information, and when another BWP is configured simultaneously in one symbol (such as 709) via the BWP resource allocation information, the base station can implicitly indicate that another BWP can maintain a single carrier without overlapping in the same symbol. This method can be used when the bandwidth of a single carrier is greater than or longer than the BWP bandwidth, and can also be used when resources are continuously allocated (when continuous PRBs are used).

[0121] Figure 8 1 is a view showing a method proposed by the present invention for configuring one or more single carrier bandwidths within a bandwidth of a terminal in a single carrier transmission system.

[0122] refer to Figure 8 , the system may include one or more bandwidths, which may be configured as a channel bandwidth 801 having a maximum frequency bandwidth, bandwidth parts (BWP) 803 and 805, scheduling bandwidths 807, 809 and 811, etc. Here, the channel bandwidth refers to the maximum bandwidth that a base station can operate in a channel, the BWP refers to the maximum bandwidth that a terminal can operate, and the scheduling bandwidth refers to the bandwidth actually used for data transmission at the current scheduling time of the maximum bandwidth that a terminal can operate. In this case, the bandwidth of a single carrier can only be configured in combination with the scheduling bandwidth.

[0123] Reference numerals 807 and 809 show the scheduling bandwidth in which the signal is actually transmitted within the BWP. For example, the signal of the scheduling bandwidth 809 can be transmitted to user 1, and the signal of the scheduling bandwidth 807 can be transmitted to user 2. In another example, reference numeral 807 can be used to transmit the control channel of user 1, and reference numeral 809 can be used to transmit the data channel of user 1. If only one single carrier frequency band (such as 807) is transmitted in one symbol, the terminal can receive the single carrier waveform signal using all symbols, but if the base station uses a single carrier of one or more frequency bands to transmit a signal, the base station should use the control channel for receiving the data channel of the terminal to transmit resource allocation information for receiving a multi-band single carrier.

[0124] The terminal may receive one or more resource allocation information for one BWP of the terminal via higher layer signaling, one is resource allocation information for single-band single carrier transmission, and the other is information for multi-band single carrier transmission. Here, the multi-band single carrier transmission information may consist of multiple information supporting one or more frequency bands. For example, in the case of single-band single carrier transmission, the resource allocation information includes information about the presence or absence of a single carrier. In the case of multi-band single carrier transmission, the multi-band single carrier information may include the aforementioned resource information (PRB resources, subcarrier combs, and comb offsets). It allows one or more subcarrier combs and comb offsets to be configured to support multiple frequency bands. An indicator indicating the resources configured as described above may be transmitted to the terminal via the control information of the control channel with the scheduling information, or may be configured to a slower speed (than the speed configured via the control information of the physical channel) via a MAC CE, which may be received via a PDCCH sent via CORESET 0.

[0125] Fig. 9 is a diagram showing another method proposed by the present invention for configuring one or more single carrier bandwidths within the bandwidth 903 of a terminal in a multi-band single carrier transmission system.

[0126] Fig. 9 A method is shown in which a terminal is previously configured with at least one single carrier frequency band 905, 907, 909 and blindly searches for a single carrier frequency band used for transmission by a base station. When the terminal receives a control channel such as a PDCCH, the terminal can search for one or more single frequency bands for transmitting signals based on a predetermined single frequency transmission configuration. In addition, multiple single carrier frequency band candidates 905, 907, 909 can be configured with different resource allocation information (DFT size, frequency position, comb, offset), and the terminal can receive signals by searching one or more frequency bands and one frequency band at a time.

[0127] Next, a method for controlling transmission power in multi-band single carrier transmission will be described. For multi-band single carrier transmission, the base station can determine the transmission power in two ways. The first method is to maintain the same average power between samples within a symbol, and the second method is to maintain different average powers between frequency bands between samples within a symbol.

[0128] Fig.10 is a view showing a first method proposed by the present invention for uniformly configuring average power between symbols in multi-band single-carrier transmission.

[0129] refer to Fig.10 , Fig.10 The method proposed in is a method of maintaining a low PAPR of samples in a symbol by taking into account the size of multiple bandwidths to reduce the PAPR in a symbol. Assuming that 1001 is a channel bandwidth, 1007 and 1009 are different frequency bands occupied by a single carrier bandwidth, and 1007 and 1009 are used as multiple frequency bands of a single carrier. At this time, when a single carrier corresponding to each frequency band is sent using a DFT preprocessor, it is assumed that a DFT of size M1 is applied to frequency band 1007, and a DFT of size M2 is applied to frequency band 1009. At this time, in order to maintain the same reference power or average power used by all samples from the perspective of time symbol 1011, the condition can be maintained by adjusting the length of sample 1013 occupied by frequency band 1007 and sample 1015 occupied by frequency band 1009. For example, when T1=M2 / (M1+M2), T2=M1 / (M1+M2), the average power of sample 1013 sent to T1 and the average power of sample 1015 sent to T2 can be kept the same.

[0130] In this case, the base station can indicate such a transmission power configuration by indicating the terminal to beta (power ratio, the ratio of the power actually transmitted to the power used when the entire sample is used) at 0 dB, indicating the length of T1, or maintaining the resource allocation information equal to T1. If the transmission power needs to be increased or decreased to maintain coverage, the base station can indicate an offset to the terminal. For example, if the power ratio corresponding to frequency band 1007 is beta 1 and the power ratio corresponding to frequency band 1009 is beta 2, beta 1 and beta 2 can be adjusted via k. Therefore, when the base station indicates k, beta 1 and beta 2 can be defined as in the following example.

[0131] Beta1=10log{(1+k)M2 / (M1+M2)}(dB),

[0132] Beta2=10log{(M1-kM2) / (M1+M2)}

[0133] The base station can indicate the power ratio to the terminal to improve the reception performance.

[0134] Fig.11 is a view showing a second method for differently configuring transmission power in symbols in multi-band single-carrier transmission proposed by the present invention.

[0135] refer to Fig.11 , Fig.11 The method proposed in is a method of controlling the power in a symbol in consideration of the coverage status of a terminal to reduce the PAPR of each frequency band in the symbol while maintaining a low PAPR. Reference numeral 1101 denotes a channel bandwidth, and reference numeral 1111 denotes that the corresponding time symbol includes a T1 sample 1113 and a T2 sample 1115. Fig.11 The method proposed in is a method of distributing transmission power among users according to the ratio of the occupied bandwidth and time product. If the size of the frequency band 1107 occupied by user 1 is M1, the time occupied by user 1 (in one symbol) is T 1113, the size of the frequency band 1109 occupied by user 2 is M2, and the occupied time is 1-T 1115, then the total transmission power P becomes P=M1·T+M2(1-T), and the power distribution among users depends on the ratio of beta1XM1·T:beta2XM2(1-T) and beta1XM1·T:beta2XM2(1-T)=P. Here, beta1 can be understood as the power ratio of user 1, and beta2 can be understood as the power ratio of user 2. Therefore, the base station indicates the beta value to the user, and the terminal can obtain the received power based on the indication. This can be understood as a method of adjusting the transmission power of the time axis sample via resource allocation.

[0136] Fig.11 The method proposed in can be used for retransmitted symbols of a data channel transmitted via a single carrier. For example, when the base station performs retransmission of an incremental redundancy (IR) scheme, generally, the number of symbols to be retransmitted can be configured to be less than the number of symbols used for initial transmission. Fig.11 In the case of the method, the base station may perform the use Fig.10 The initial transmission uses the amount of resources of 1003 and the retransmission uses the reduced amount of resources of 1103. In this case, since the transmission power of the transmitted samples is increased to 1111 (with Fig.10 The signal-to-noise ratio (SNR) of each sample can be increased, thereby increasing the possibility of successful retransmission.

[0137] Hereinafter, a method of controlling interference between a plurality of terminals or interference between a plurality of base stations using single carrier transmission will be described.

[0138] Fig.12is a view showing a multiplexing method proposed by the present invention for minimizing interference of signals of one or more multiple terminals simultaneously transmitted in multi-band single-carrier transmission.

[0139] refer to Fig.12 , Fig.12 A method of using interleavers 1207 and 1209 to allow user signals 1203 and 1205 using different frequency bands to occupy orthogonal time (i.e., non-overlapping time) in a transmission symbol 1215 is shown. User signals 1203 and 1205 are dispersedly mapped to signal carrier bandwidths 1211 and 1213 via interleavers 1207 and 1209. Interleaving operations can be performed on signals of different frequency bands sent in the same symbol via the following three methods. The present invention can be performed based on method 1) a symbol index-based interleaver, method 2) a base station identifier-based interleaver, and method 3) a slot index-based interleaver. These interleavers allow each frequency band 1203 and 1205 to occupy time sample 1 1219 and time sample 2 1217 on a time symbol 1215, respectively. Time sample 1 1219 and time sample 2 1217 may not overlap and may be orthogonal to each other.

[0140] In addition, the method proposed by the present invention can be used for diversity transmission, which occupies orthogonal times while transmitting a data signal sent to one terminal 1203, 1205 in different frequency bands. The first method used for this is a method for the base station to generate a data signal, copy the data signal, and send the same data in different frequency bands 1203, 1205. In this case, since the same data is sent in different frequency bands within the same symbol, the base station can send data more robustly through diversity.

[0141] The second method is that the base station generates a data signal and divides the generated data signal into a first data symbol group and a second data symbol group, so that the first data symbol is sent in the frequency band of 1203, and the second data symbol is sent in the frequency band of 1205. The method of separating the first data symbol group and the second data symbol group may include a method of separating by the number of symbols, a method of separating by codeword index, and a method of separating by layer. In the method of dividing by the number of symbols, for example, when the number of generated data signals is n, the first data symbol group may include nm data symbols, and the second data symbol group may include m data symbols. For example, in the method of separating codeword indexes, when four codewords are generated, the first data symbol group includes CW#1 and CW#3, and the second data symbol group includes CW#2 and CW#4. It may be like this. In the method of separating by layer, multiple layers of data symbols in which codewords are arranged in each layer are generated by layer mapping, and each layer is included in each data symbol group. For example, when 8 layers are generated, the first data symbol group may include layers #1, #3, #5, and #7, and the second data symbol group may include layers #2, #4, #6, and #8. Mapping to the data symbol group of each layer may be performed in a layer mapping step.

[0142] In particular, in the case of the layer-by-layer separation method, even if the rank fed back by the terminal (the rank can be understood as the recommended number of layers of data reported by the terminal to the base station) is 1, the base station generates a data signal of rank 2 (that is, generates 2 layers) and transmits the data to different frequency bands 1203 and 1205 of each layer. The above method is a method for obtaining diversity gain by sending different frequency bands for each layer while maintaining rank 1 data channel transmission. If the number of frequency bands to which the base station sends signals is L (when an L DFT window is used), the base station generates a data channel with a maximum rank L (that is, generates L layers), and then in each of the L frequency bands. Rank 1 transmission can be maintained by sending data signals according to each layer.

[0143] If the base station and the terminal use cross-polarization antennas and the feedback of the terminal is rank 2, the base station generates a data channel signal of rank 2 and sends each layer in different frequency bands 1203 and 1205, or generates a data channel signal of rank 4 and sends each layer in two layers in different frequency bands 1203 and 1205 to obtain diversity gain. In this case, four layers can be generated by respectively duplicating two layers or by dividing the data symbols of one layer into two layers.

[0144] In addition, according to Fig.12The interleavers 1207 and 1209 of the base station can be used to transmit the signal to each terminal. The signal sent to each terminal can occupy orthogonal time (non-overlapping time) or pseudo-orthogonal time. When the signal sent to each terminal occupies the orthogonal time, the correlation of the sample units between the transmission symbols of the frequency bands 1203 and 1205 can be guaranteed to be zero. When the signal sent to each terminal occupies the pseudo-orthogonal time, the base station can send the signal so as to ensure that the correlation of the sample units between the transmission symbols of the frequency bands 1203 and 1205 is 1 / C or less. To this end, the base station can configure the corresponding interleavers 1207 and 1209 so that the correlation is lower than a certain threshold, or allocate resources so that the overlapping sample rate on the time axis occupied by the signal sent to each terminal is lower than a certain threshold. At this time, the base station can determine M1 and / or M2 so that the correlation is lower than a certain threshold or the rate of sample overlap is lower than a certain threshold. In this case, compared with the case where the signal sent to each terminal occupies the orthogonal time, the increase in PAPR is a disadvantage, but the increase in the efficiency of using resources is an advantage.

[0145] Fig.13 1 is a diagram showing an interference control method between different base stations in multi-band single-carrier transmission proposed by the present invention. Fig.13 , the proposed embodiment is a method of using an interleaving method that occupies non-orthogonal time between users or cells. That is, an interleaver operation can be performed on signals transmitted from different base stations that are transmitted simultaneously by the following methods. The present invention includes method 1) an interleaver based on a user identifier, method 2) an interleaver based on a base station identifier, and method 3) an interleaver using different random number generation functions. Reference numeral 1303 represents a frequency band of a signal transmitted from base station 1, and reference numeral 1309 represents a frequency band of a signal transmitted from base station 2. The symbols of each frequency band are mapped to virtual resources distributed by interleavers 1305 and 1311, and are transmitted from each base station as a single carrier signal through DFT conversion. At this time, the signal of each base station is transmitted simultaneously in symbols 1313 and 1317, the signal of base station 1 occupies a time sample equal to 1315 in symbol 1313, and the signal of base station 2 occupies a time sample equal to 1319 in symbol 1317. In this way, since the signals from different base stations are distributed on the time axis, interference between different base stations can be controlled.

[0146] Fig.14 14 is a diagram showing an interference control method between base stations when one or more base stations using the multi-band single-carrier transmission scheme proposed by the present invention use different subcarrier spacings in the channel bandwidth 1401. Fig.14, the proposed embodiment is a method in which different groups of terminals (e.g., 1407) receiving different BWPs receive signals according to different BWPs in the same symbol. This can be achieved via the following method. According to method 1, when two different BWPs have the same subcarrier spacing, the signal of each BWP can be sent using the positioning of samples that are orthogonal to each other (i.e., not overlapping on the time axis). According to method 2, when two different BWPs have different subcarrier spacings, in the BWP 1405 with a relatively large subcarrier spacing (which is twice the bandwidth of other BWPs, which can be the BWP used in TxRP1), since the subcarrier spacing is inversely proportional to the symbol length, the symbol length of symbol 1403 is reduced by half. In this BWP, only some of the available symbols are used for transmission. For example, only odd (or even) symbols can be used for transmission. Another BWP 1409 (which can be the BWP used in TxRP2) can use the positioning of some samples in one symbol (wherein the signal according to BWP 1405 is not sent), so the signals according to the two BWPs can be sent orthogonally. In addition, for such interference control, both base stations TxRP1 and TxRP2 may transmit and receive information on resources to which they may allocate data transmission. Each base station may perform single-carrier based data transmission based on the resource allocation information.

[0147] Fig.15A 1 is a diagram showing a structure for transmitting one or more different channels with different symbols in a multi-band single carrier transmission in a channel bandwidth 1501 proposed by the present invention. Fig.15A , the reference signal 1503 for the control channel, the control channel 1505, the reference signals 1507 and 1511 for the data channel, and the data channels 1509 and 1513 may be transmitted using different symbols. In this case, the data channel may be transmitted after the control channel is transmitted. Fig. 15B 1 is a diagram showing a packet structure for multiplexing and transmitting one or more different channels in one symbol in a multi-band single carrier transmission in a channel bandwidth 1515 proposed by the present invention. Fig. 15B , the reference signal 1517 for the control channel, the control channel 1519, the reference signals 1523 and 1525 for the data channel, and the two reference signals 1523 and 1525 for the data channel in the data channels 1521 and 1527 and the data channels 1521 and 1527 can be transmitted in the same symbol so that each reference signal 1523 and 1521, 1525 and 1527 do not overlap with each other. That is, different data and reference signals can be transmitted in a symbol. According to Fig. 15B , it can be seen that Fig.15A Compared with the method, the transmission delay is reduced.

[0148] Fig.16A 1 is a diagram showing a packet structure for multiplexing and transmitting one or more different channels in one symbol in order to reduce transmission delay time in multi-band single-carrier transmission proposed by the present invention. Fig.16A In the channel bandwidths 1601 and 1611, the reference signal 1603 for the control channel, the control channel 1605, the reference signal 1607 for the data channel, and the data channel 1609 mapped to the existing symbols can all be transmitted in one symbol 1613, 1615, and 1617. In this case, when mapped to one symbol, the reference signal 1607 for the data channel can be omitted. Alternatively, both the control channel and the data channel can be demodulated with one reference signal 1613. At this time, the reference signal 1613, the control channel 1615, and the data channel 1617 can be time-division multiplexed in one symbol. Fig. 16B 16 is a view showing a method of multiplexing different channels in one symbol. It can be seen that when the reference signal 1621, the control signal 1623, and the data signal 1625 are sequentially and continuously mapped to virtual resources with an FFT size 1619 before the DFT preprocessor and transmitted, three types of different channels 1631, 1633, and 1635 can be multiplexed and transmitted in one symbol 1629, thereby reducing transmission delay.

[0149] Fig.17 1 is a diagram showing a packet structure proposed by the present invention for a case where a control channel and a data channel occupy different frequency bands in a multi-band single carrier transmission. Fig.17 , the proposed embodiment is a method for configuring a single carrier including a channel when a reference signal 1703 for a control channel, a control channel 1705, a reference signal 1707 for a data channel, and a data channel 1709 are transmitted in different frequency bands in an FFT size 1701. To this end, a reference signal 1717 for a control channel, a control channel 1719, a reference signal 1721 for a data channel, and a data channel 1723 may be allocated to orthogonal sample regions that do not overlap with each other in a symbol 1715 via DFT such as 1711 and 1713.

[0150] Fig.18 2 is a diagram showing a method for transmitting one or more beams to one symbol in multi-band single-carrier transmission proposed by the present invention. Fig.18, showing a method of allowing beams to occupy different transmission bandwidths when one or more beams are used to transmit signals in one symbol. Reference numeral 1801 represents the channel bandwidth of the cell operated by the terminal, which can be understood as the area occupied by the FFT used by the terminal. At this time, the transmitter can transmit so that N different beams occupy different frequency bands, but time-multiplexed in one symbol by applying DFTs such as 1811, 1813, 1815 and 1817 in the transmission 1803, 1805, 1807 and 1809, which are reference signals to which N different beams are applied (hereinafter, may be mixed with beams).

[0151] exist Fig.18 In the figure, it is shown that the bandwidth occupied by each beam is the same, the single carrier bandwidth of each beam is continuous, the same size of each single carrier bandwidth, and each beam is sent sequentially within a time symbol. However, when the occupied bandwidth of each beam is different, the occupied bandwidth of each beam is not periodic, the single carrier bandwidth is discontinuous, or each beam is transmitted non-sequentially, the content of the present invention can be equally applied. The base station can send information such as the number of transmission beams, the size of the bandwidth occupied by each beam, the transmission order, etc. to the terminal via higher layer signaling, and the base station can pre-configure multiple combinations by combining one or more information and send it to the terminal (via higher layer signaling). When the terminal is assigned multiple configurations, the terminal can receive an indication of one of the multiple configurations from the base station via control information sent on a control channel such as PDCCH.

[0152] From the perspective of one symbol in 1819, the reference signal to which the above beam is applied is sequentially transmitted as occupied time samples such as 1821, 1823, 1825, and 1827. Fig.18 In the example, reference signals occupying different frequency bands are allocated to 1803, 1805, 1807, and 1809 to occupy different quarter-time samples in each frequency band and are transmitted without overlapping each other. If the base station sends a transmission beam differently for each reference signal, the base station should be configured so that the time occupied by each reference signal is shorter than 1 / 4 in consideration of the switching time between beams. If the terminal searches for a reception beam, each reference signal is sent to occupy more samples to improve reception accuracy without considering the switching time between beams, such as Fig.18 The combination of transmit beam and receive beam utilization can be achieved by alternately using the above methods.

[0153] Fig.19 1 is a diagram showing a method for performing beam detection by transmitting one or more beams in multi-band single-carrier transmission proposed by the present invention. Fig.19, reference numeral 1901 shows the channel bandwidth operated by the cell accessed by the terminal, which can be understood as the area occupied by the FFT used by the terminal. The proposed embodiment sends N different reference signals in one symbol in the same single carrier frequency band 1911, and applies different simulated beams to each reference signal. The terminal can select one of the best beams based on the reference signal with the highest received power among the reference signals sent by the base station by receiving one symbol and separating the received time samples in time. According to this embodiment, since the base station can use one or more beams in one symbol, the beam transmission and beam search time can be reduced. Reference numerals 1903, 1905, 1907 and 1909 are examples when the number of reference signals N is 4. Here, it can be seen that, considering the time margin for the transmitter to switch beams, each reference signal is allocated to a virtual resource at regular intervals from each other. If the beam can be changed faster, the time interval can be shortened or more beams can be sent. In the case of beam retrieval, measuring the beam received power is more important than channel estimation. Therefore, knowing how many beams can be sent in a short time is more important than the channel estimation performance of the transmission signal. Therefore, according to the proposed method, the base station can quickly send multiple beams to the terminal in one symbol, and the terminal can quickly search for the optimal beam.

[0154] Since the reference signals 1903, 1905, 1907 and 1909 are sent in the same single carrier frequency band 1911, they all occupy the same frequency band. In order to send each reference signal in a different frequency band, the base station may send each reference signal in a different frequency band considering the occupation time of each reference signal, such as Fig.18 As shown. From the perspective of one time symbol 1913, it can be seen that the transmission of four reference signals, such as 1915, 1917, 1919 and 1921, occupies different sample times, and the transmitter can change the beam during the interval between 1915 and 1917. In contrast, the base station can use the same beam to send reference signals at 1903, 1905, 1907 and 1909, and the terminal can change the weight of the receiving beam while receiving 1915, 1917, 1919 and 1921 to perform receiving beam search. As described above, the method proposed by the present invention can also be used for receiving beam search, and can also be used for a combination of sending and receiving beam search. Configuration information for beam search can be sent to the terminal via higher layer signaling, or can be sent to the terminal via control information sent through a control channel such as PDCCH and signaling information such as MAC CE. The configuration information may include at least one of reference signal configuration information, which includes time and frequency resources, the number of transmission beams, the size of the bandwidth of each reference signal to which the transmission beam is applied, the occupancy time of the beam, and the transmission order of the beam.

[0155] Fig. 20A FIG. 2 is a diagram showing a single carrier frequency band configuration method proposed by the present invention. Fig. 20A , a single carrier frequency band can be configured regardless of the resource allocation region to which the terminal is scheduled, and the embodiment includes a method for indicating a bandwidth offset of the terminal so that the terminal recognizes the single carrier frequency band configuration. Reference numeral 2001 shows the channel bandwidth of the cell operated by the terminal, which can be understood as the FFT region used by the terminal. In this case, the terminal will be allocated a separate BWP according to its performance, and in order for the base station to send a single carrier signal, the base station should configure the single carrier frequency band considering the resource allocation information of the data actually sent in the BWP or the BWP of the terminal.

[0156] In the case of NR, the resource allocation method can be configured as a virtual resource unit occupying 12 subcarrier regions, and the unit is called a resource block (RB). Therefore, the terminal receives resource allocation in multiples of 12 subcarrier regions. BWP can be indicated and configured by six consecutive RBs. In this case, the frequency band of a single carrier used by the terminal can be configured to be greater than a multiple of 12, and the error generated at this time can be configured to be less than 12 subcarriers (that is, it can be configured to be 11 subcarriers or less). The error configuration can be included in the BWP configuration information or PDSCH configuration information via higher layer signaling and sent to the terminal. In addition, the error configuration can be dynamically sent to the terminal via PDCCH. The error configuration can also be the starting point of resource allocation with a low frequency index and an error of a single carrier frequency band, and the end point of resource allocation with a high frequency index and an error of a single carrier frequency band. The error configuration can be transmitted to the terminal in a manner that sends information indicating whether the error is part of the error and whether the single carrier frequency band is consistent with the frequency resource allocation frequency band.

[0157] according to Fig. 20A , B 2000 corresponds to the case where BWP 2005 and single carrier frequency band 2003 are consistent. In this case, the resource allocation region and the single carrier frequency band are consistent. On the contrary, B 2100 corresponds to the case where BWP 2011 and single carrier frequency band 2009 are inconsistent. Reference numeral 2013 is the error of the frequency band occupied by BWP 2011 and single carrier frequency band 2009, in which case the resource allocation region and the single carrier frequency band are also inconsistent.

[0158] Fig. 20B FIG. 2 is a diagram showing another single carrier frequency band configuration method proposed by the present invention. Fig. 20B, C2020 and D2030 are inconsistent in BWP and single carrier frequency bands. In the case of C2020, the resource allocation frequency band and the single carrier frequency band are consistent with each other (2019). In the case of D2030, an error 2027 occurs between the resource allocation frequency band and the frequency band occupied by the single carrier 2025. Fig. 20A and Fig. 20B In FIG. 5 , errors with a starting point of a low frequency index are shown, but the same method can be applied to the method supporting the above-mentioned multiple errors.

[0159] Fig.21 is a view showing an example of the operation of a base station for performing the present invention.

[0160] refer to Fig.21 In operation 2101, the base station sends one or more configurations for single carrier transmission to the terminal via higher layer signaling (for example, at least one of the configuration information described in the present invention, such as the comb shape, offset, position and size of the BWP frequency band, subcarrier spacing, position and size of the single carrier frequency band, difference (offset) between the BWP frequency band and the single carrier frequency band, transmission power ratio, configuration information for beam detection, etc.). In operation 2103, the base station indicates the single carrier transmission configuration for data transmission to the terminal via higher layer signaling, PDCCH or MAC CE, and indicates control information (resource allocation information or downlink control information) for PDSCH reception to the terminal via PDCCH. At this time, the single carrier transmission configuration indication indicated by the base station in operation 2103 can be information indicating one of the one or more configuration information configured in operation 2101. In addition, the process of indicating the single carrier transmission configuration in operation 2103 can be omitted. In this case, only one single carrier transmission configuration information can be sent in operation 2101.

[0161] In operation 2105, the base station transmits PDSCH to the terminal using a single carrier. Then, in operation 2107, the base station updates and transmits control information for PDSCH reception using a single carrier for retransmission based on transmission success or failure of PDSCH reported by the terminal, and transmits PDSCH based thereon.

[0162] In addition, the base station may operate as follows. An example of a method for transmitting multiple terminals in different frequency bands using a single carrier is as follows. The base station may determine a preferred frequency band for each user, determine a ratio of samples occupied by one terminal to multiple terminals, determine a position occupied by one symbol of a data channel sent to multiple terminals, and determine the power of samples occupied by one terminal to multiple terminals. In addition, the base station may determine a single carrier occupied bandwidth based on an allowed bandwidth of the terminal, and may configure one or more single carrier occupied bandwidths based on the allowed bandwidth of the terminal and indicate it to one or more terminals.

[0163] In addition, in order to occupy orthogonal time when sending single-carrier signals to terminals occupying different frequency bands connected to a base station, the base station can interleave the resources available to each terminal, or interleave the resources to which the signal of each terminal can be sent, so as to reduce interference when sending single-carrier signals to terminals occupying the same frequency band in one or more base stations.

[0164] In addition, when terminals occupying overlapping frequency bands in one or more base stations perform communication using different subcarrier spacings, the base station can exchange information with the terminal and / or adjacent base stations to send signals without interference. In addition, the base station can multiplex one or more supported reference signals into one symbol to maintain a single carrier, and include at least a reference signal, a control signal, and a data signal in one symbol to reduce transmission delay. In addition, the base station can configure one or more single-carrier frequency bands corresponding to one symbol to send one or more beams (reference signals applied) without overlapping symbols.

[0165] Fig. 22 is a view showing an example of an operation of a terminal for performing the present invention.

[0166] according to Fig. 22 First, in operation 2201, the terminal receives one or more single carrier transmission configurations for data reception from the base station via higher layer signaling. The single carrier transmission configuration may be Fig.21 In operation 2203, the terminal receives a single carrier configuration indication for data transmission via higher layer signaling, PDCCH or MAC CE, identifies the single carrier configuration, and receives information for PDSCH reception via PDCCH.

[0167] Then, in operation 2205, the terminal receives and demodulates the PDSCH transmitted on the single carrier. In operation 2209, the terminal determines whether the received PDSCH has been successfully received, and if the reception fails, in operation 2207, the terminal sends information indicating whether the reception is successful to the base station via an uplink. In operation 2203, new configuration information for subsequent PDSCH transmission or retransmission may be received, a PDCCH for scheduling retransmission may be received, and a PDSCH may be received in operation 2205.

[0168] Fig.2323 is a view showing a base station device capable of performing the present invention. The base station device 2300 includes a transceiver 2310, a controller 2320 and a storage unit 2330, and the transceiver 2310 can send and receive signals with a terminal. The signal may include control information, a reference signal and data. To this end, the transceiver 2310 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplification and down-conversion of the received signal. In addition, the transceiver 2310 may receive a signal through a wireless channel, output the signal to the controller 2320, and transmit the signal output from the controller 2320 through a wireless channel. According to the above-mentioned embodiment of the present invention, the controller 2320 may control a series of processes to operate the base station.

[0169] Fig.24 24 is a view showing a terminal device capable of performing the present invention. The terminal device 2400 includes a transceiver 2410, a controller 2420 and a storage unit 2430, and the transceiver 2410 can transmit and receive signals with a base station. The signal may include control information, a reference signal and data. To this end, the transceiver 2410 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplification and down-conversion of the received signal. In addition, the transceiver may receive a signal through a wireless channel, output the signal to the controller 2420, and transmit the signal output from the controller 2420 through the wireless channel. According to the above-mentioned embodiment of the present invention, the controller 2420 may control a series of processes to operate the terminal.

[0170] According to an embodiment of the present invention, a base station can effectively send signals to multiple terminals through a single carrier, and can also improve system performance by sending signals through the preferred frequency band of each terminal. In addition, according to an embodiment of the present invention, a base station can maintain coverage by sending a single carrier signal to each terminal in a frequency band preferred by one or more terminals using the same analog beam. In addition, according to an embodiment of the present invention, a base station can preset or adjust the time domain of samples occupied by one terminal in one symbol, and can send signals so that samples of each terminal do not overlap in the time domain between terminals. In addition, according to an embodiment of the present invention, a base station can support single carrier transmission regardless of the maximum allowed frequency band of the terminal and the size of the frequency domain of the data channel actually sent.

[0171] In addition, according to an embodiment of the present invention, the base station may preset one or more candidates for a single-carrier transmission bandwidth in the terminal and perform data scheduling so that the base station can change dynamically or reactively. In addition, according to an embodiment of the present invention, the base station may adjust the power density sent to the terminal by considering the sample occupancy time in the frequency band or symbol allocated by the terminal, without considering the frequency band. In addition, according to an embodiment of the present invention, the base station may allow samples of a data channel sent to one or more terminals to be distributed in the form of symbols, but not overlap with samples of data channels of other terminals.

[0172] In addition, according to an embodiment of the present invention, when one or more base stations simultaneously transmit signals by occupying the same frequency band, interference can be randomized so that there are only some overlapping samples (on the time axis) between the terminals scheduled by the corresponding base stations. In addition, according to an embodiment of the present invention, when one or more base stations using different subcarrier spacings transmit signals by occupying the same frequency band, the base station can transmit signals without interference. In addition, according to an embodiment of the present invention, the base station can use the offset of the virtual resource index differently in the frequency band used by each terminal to transmit a reference signal for supporting one or more terminals occupying different frequency bands so that no interference occurs.

[0173] In addition, according to an embodiment of the present invention, the base station may perform reference signal transmission for supporting one or more terminals occupying different frequency bands. In addition, according to an embodiment of the present invention, the base station may multiplex and send at least one of a reference signal, a control channel, and a data channel to one symbol for one or more terminals occupying different frequency bands. In addition, according to an embodiment of the present invention, a base station may use different samples in one or more frequency bands using different analog beams in one symbol to send signals.

[0174] The embodiments disclosed in the specification and the drawings are merely illustrations of specific examples for facilitating the description and understanding of the technical content, and are not intended to limit the scope of the present invention. It is obvious to those skilled in the art that other modified examples based on the technical ideas of the present invention and the embodiments disclosed herein can be implemented.

[0175] Although various embodiments of the present invention have been shown and described in this specification and the drawings, they are used in a general sense to easily explain the technical content of the present invention and to help understand the present invention, and are not intended to limit the scope of the present invention. It is obvious to those skilled in the art that other modified examples based on the technical ideas of the present invention and the embodiments disclosed herein can be implemented.

Claims

1. A method performed by a base station of a wireless communication system, the method comprising: identifying configuration information for single carrier signal transmission; Sending configuration information for single carrier signal transmission to a terminal; Sending control information for scheduling data transmission to the terminal; as well as Send data to the terminal using a single carrier on multiple frequency bands corresponding to the configuration information and the control information, The configuration information includes resource allocation information associated with the multiple frequency bands used for single-carrier signal transmission, and the resource allocation information includes at least one of discrete Fourier transform (DFT) precoding offset or frequency comb information, frequency resource information of the bandwidth part, or subcarrier spacing information.

2. The method according to claim 1, further comprising: sending information indicating one of a plurality of configuration information sets included in the configuration information to the terminal, The information is sent via higher layer signaling or a medium access control MAC control element.

3. The method according to claim 1, wherein: The configuration information includes power ratio information of frequency bands applied to the plurality of frequency bands, The data is sent in a portion of a time symbol, and The transmission power of the data is based on the power ratio information.

4. The method according to claim 1, further comprising: Sending multiple reference signals to which beams are applied to the terminal, in: The configuration information includes beam-related configuration information, and The multiple reference signals are transmitted in one time symbol.

5. The method according to claim 1, wherein: The frequency comb information includes at least one of a comb spacing or a comb offset.

6. A method performed by a terminal of a wireless communication system, the method comprising: receiving configuration information for single carrier signal transmission from a base station; receiving control information for scheduling data transmission from a base station; as well as According to the configuration information and control information, a single carrier on multiple frequency bands is used to receive data from the base station. The configuration information includes resource allocation information associated with the multiple frequency bands used for single-carrier signal transmission, and the resource allocation information includes at least one of discrete Fourier transform (DFT) precoding offset or frequency comb information, frequency resource information of the bandwidth part, or subcarrier spacing information.

7. The method according to claim 6, further comprising: receiving, from the base station, information indicating one of a plurality of configuration information sets included in the configuration information, The information is received via higher layer signaling or a medium access control MAC control element.

8. The method according to claim 6, wherein: The configuration information includes power ratio information of frequency bands applied to the plurality of frequency bands, The data received by the terminal is received in a portion of a time symbol, and The transmission power of the data is based on the power ratio information.

9. The method according to claim 6, further comprising: receiving a plurality of reference signals to which beams are applied from a base station, in: The configuration information includes beam-related configuration information, and The plurality of reference signals are received in one time symbol.

10. The method according to claim 6, wherein: The frequency comb information includes at least one of a comb spacing or a comb offset.

11. A base station of a wireless communication system, the base station comprising: Transceiver; as well as A controller is coupled to the transceiver and is configured to: Identify the configuration information for single carrier signal transmission, Sending configuration information for single carrier signal transmission to the terminal, Sending control information to the terminal to schedule data transmission, and Send data to the terminal using a single carrier on multiple frequency bands corresponding to the configuration information and the control information, The configuration information includes resource allocation information associated with the multiple frequency bands used for single-carrier signal transmission, and the resource allocation information includes at least one of discrete Fourier transform (DFT) precoding offset or frequency comb information, frequency resource information of the bandwidth part, or subcarrier spacing information.

12. The base station according to claim 11, wherein: The controller is further configured to send information indicating one of a plurality of configuration information sets included in the configuration information to the terminal, and The information is sent via higher layer signaling or Medium Access Control MAC Control elements.

13. The base station according to claim 11, wherein: The configuration information includes power ratio information of frequency bands applied to the plurality of frequency bands, Data sent to the terminal is sent as part of a time symbol. The transmission power of the data is based on the power ratio information.

14. The base station according to claim 11, wherein: The controller is further configured to send a plurality of reference signals to which beams are applied to the terminal. The configuration information includes beam-related configuration information, and The multiple reference signals are transmitted in one time symbol.

15. The base station according to claim 11, wherein: The frequency comb information includes at least one of a comb spacing or a comb offset.

16. A terminal of a wireless communication system, the terminal comprising: Transceiver; as well as A controller coupled to the transceiver and configured to: receiving configuration information for single carrier signal transmission from a base station; receiving control information for scheduling data transmission from a base station; and According to the configuration information and control information, a single carrier on multiple frequency bands is used to receive data from the base station. The configuration information includes resource allocation information associated with the multiple frequency bands used for single-carrier signal transmission, and the resource allocation information includes at least one of discrete Fourier transform (DFT) precoding offset or frequency comb information, frequency resource information of the bandwidth part, or subcarrier spacing information.

17. The terminal according to claim 16, wherein: The controller is configured to receive information indicating one of a plurality of configuration information sets included in the configuration information from the base station, The information is received via higher layer signaling or a Medium Access Control MAC Control element.

18. The terminal according to claim 16, wherein: The configuration information includes power ratio information of frequency bands applied to the plurality of frequency bands, The data received by the terminal is received in a portion of a time symbol, and The transmission power of the data is based on the power ratio information.

19. The terminal according to claim 16, wherein: The controller is configured to receive a plurality of reference signals to which beams are applied from a base station, The configuration information includes beam-related configuration information, and The plurality of reference signals are received in one time symbol.

20. The terminal according to claim 16, wherein: The frequency comb information includes at least one of a comb spacing or a comb offset.

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