Method and apparatus for performing channel multiplexing for millimeter wireless communications

Abstract

Disclosed are a communication scheme and system for integrating IoT technology and a 5G communication system to support a high data transmission rate exceeding that of a 4G system. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies (e.g., services related to smart homes, smart buildings, smart cities, smart cars, connected cars, healthcare, digital education, retail business, security, and safety). A method for receiving a synchronization signal block (SSB) by a UE in a wireless communication system may include: identifying whether the bandwidth of a cell that sends an SSB that the UE expects to receive corresponds to a first frequency band (FR); when the bandwidth of the cell corresponds to the first frequency band, receiving the SSB using a single carrier waveform; and acquiring synchronization based on the received SSB; and acquiring system information.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for communication between a base station (BS) and user equipment (UE) in a millimeter wave wireless communication system, and more particularly, to a method and apparatus for multiplexing a synchronization signal and a signal for system information to multiple UEs via a single carrier signaled by the BS. Furthermore, the present disclosure relates to a method and apparatus for multiplexing a synchronization signal, a signal for system information, and a data channel signal for scheduling via a single carrier signaled by a single BS. Background Art

[0002] In order to meet the demand for wireless data traffic that has increased since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (mmWave) bands (e.g., 60 GHz bands) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, and the like. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet, a human-centric connected network where humans generate and consume information, is now evolving into the Internet of Things (IoT), in which distributed entities such as things exchange and process information without human intervention. The Internet of Everything (IoE), a combination of IoT technology and big data processing technology connected to cloud servers, has emerged. Since IoT implementation requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have recently been researched. Such an IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated between connected things. Through the convergence and combination of existing information technology (IT) and various industrial applications, the IoT can be applied in a variety of fields, including smart homes, smart buildings, smart cities, smart cars or connected vehicles, smart grids, healthcare, smart appliances, and advanced medical services.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. The application of cloud radio access networks (RAN), which are the aforementioned big data processing technologies, can also be considered an example of the convergence of 5G and IoT technologies.

[0005] Generally, mobile communication systems have been developed to ensure the mobility of users and to provide communication. Mobile communication systems have entered a stage of providing high-speed data communication services as well as voice communication under the power of rapid technological development. Recently, the Third Generation Partnership Project (3GPP) is standardizing the New Radio (NR) system as one of the next generation mobile communication systems. The NR system is developed to meet various network requirements and achieve a wide range of performance goals. It is a technology for achieving communication in the millimeter wave band. Hereinafter, the NR system may be understood as including a 4G LTE system, an LTE-A system, and a 5G NR system that support microwaves and communications in millimeter wave bands greater than or equal to 6 GHz.

[0006] The above information is presented as background information only to assist with understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the Invention

[0007] Technical issues

[0008] When a base station transmits data to a user equipment (UE) over a single carrier at or above 6 GHz millimeter wave (mmWave) frequencies capable of supporting NR systems, high-power signal transmission is required to overcome high path loss and signal attenuation. In this case, it is difficult for the base station to use multi-carrier transmission technology. Therefore, this disclosure proposes a method and apparatus for efficiently transmitting and receiving synchronization signals and broadcast signals carrying system information over a single carrier in the millimeter wave band.

[0009] Problem Solution

[0010] According to the present disclosure, to solve the above problems, the BS can obtain a broadcast signal based on the frequency band, subcarrier spacing, single carrier bandwidth for SSB and its size, and identify channel bandwidth information through the obtained broadcast signal based on one or more code points of system information. According to an embodiment of the present disclosure, the BS can transmit a synchronization signal by selectively using different carrier waveforms (CP-OFDM, single carrier (SC) waveform) to transmit system information.

[0011] A method for a base station (BS) to multiplex channels using a single carrier in a downlink includes: configuring a signal by selecting a waveform of a synchronization signal from one or more waveforms; configuring information (channel bandwidth) configured by the BS as system information; configuring a broadcast signal to transmit the system information and placing the broadcast signal in time and frequency resources; determining the waveform of the broadcast signal based on the waveform information of the synchronization signal and generating a signal; and generating a signal for a control channel and a data channel resource region based on the system information. A method for a UE to receive an SSB using a single carrier includes: reconstructing a synchronization signal using one or more waveforms; reconstructing a broadcast signal based on the reconstructed waveform information; identifying system information in the reconstructed broadcast signal; and identifying channel bandwidth information and data reception resource allocation information in the system information.

[0012] According to the present disclosure, a base station for multiplexing channels in a millimeter wave wireless communication system includes a transmitter and a controller configured to control the transmitter. A user equipment (UE) for receiving a synchronization signal, a broadcast signal, and a data channel using a single carrier signal in a millimeter wave wireless communication system includes a receiver and a controller configured to control the receiver.

[0013] According to one aspect of the present disclosure, a method for transmitting a synchronization signal block (SSB) by a base station (BS) in a wireless communication system is provided. The method includes: identifying whether the bandwidth of a cell controlled by the BS corresponds to a first frequency band (frequency range (FR)); and when the bandwidth of the cell corresponds to the first frequency band, transmitting the SSB using a single carrier waveform, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) for transmitting system information.

[0014] Transmitting SSB using a single carrier waveform may include: transmitting the PSS and SSS using a single carrier waveform in a first bandwidth; and transmitting system information using the single carrier waveform in a second bandwidth via the PBCH. Transmitting SSB using a single carrier waveform may include: transmitting the PSS using a multi-carrier waveform in the first bandwidth; transmitting the SSS using a single carrier waveform in the first bandwidth; and transmitting system information using the single carrier waveform in the second bandwidth via the PBCH. Transmitting SSB using a single carrier waveform may include: transmitting the PSS and SSS using a multi-carrier waveform in the first bandwidth; and transmitting system information using the single carrier waveform in the second bandwidth via the PBCH.

[0015] The method may also include: sending downlink control information (DCI) for scheduling additional system information through a physical downlink control channel (PDCCH) in a frequency band where PBCH is not sent in a symbol to which PBCH is mapped; and sending additional system information scheduled by DCI through a physical downlink shared channel (PDSCH) in a frequency band where PBCH is not sent in another symbol to which PBCH is mapped.

[0016] According to another aspect of the present disclosure, a method for receiving a synchronization signal block (SSB) by a UE in a wireless communication system is provided. The method includes: identifying whether the bandwidth of a cell transmitting the SSB that the UE desires to receive corresponds to a first frequency band (frequency range (FR)); when the bandwidth of the cell corresponds to the first frequency band, receiving the SSB using a single carrier waveform; and acquiring synchronization and system information based on the received SSB, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) for receiving system information.

[0017] According to another aspect of the present disclosure, a base station (BS) for transmitting a synchronization signal block (SSB) in a wireless communication system is provided. The BS includes a transceiver; and a controller connected to the transceiver and configured to perform control to identify whether the bandwidth of a cell controlled by the BS corresponds to a first frequency band (frequency range (FR)), and when the bandwidth of the cell corresponds to the first frequency band, transmit the SSB using a single carrier waveform, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) for transmitting system information.

[0018] According to another aspect of the present disclosure, a UE for receiving a synchronization signal block (SSB) in a wireless communication system is provided. The UE includes: a transceiver; and a controller connected to the transceiver and configured to perform control to identify whether the bandwidth of a cell transmitting the SSB that the UE desires to receive corresponds to a first frequency band (frequency range (FR)), receive the SSB using a single carrier waveform when the bandwidth of the cell corresponds to the first frequency band, and acquire synchronization and system information based on the received SSB, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) for transmitting system information.

[0019] Before proceeding with 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 therewith" and their derivatives may mean including, included within, interconnected with, containing, contained within, connected to or connected with, coupled to or coupled with, communicable with, cooperating with, interleaved, juxtaposed, proximate to, 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.

[0020] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed of 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), random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (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 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 discs or erasable storage devices.

[0021] 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.

[0022] Beneficial effects of the present invention

[0023] According to embodiments of the present disclosure, a base station can efficiently multiplex and transmit synchronization signals, broadcast signals, or control channels and data channels for data scheduling using a single carrier frequency, thereby increasing coverage. The synchronization signal and the broadcast signal are allocated to and transmitted in different frequency bands, thereby reducing the time overhead for transmitting synchronization signal blocks (SSBs). BRIEF DESCRIPTION OF THE DRAWINGS

[0024] For a more complete understanding of the present disclosure 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:

[0025] Figure 1A The structure of the time-frequency domain as the NR system resource area is shown;

[0026] Figure 1B The time slot structure considered for the NR system is shown;

[0027] Figure 1C A communication system in which a BS and a UE transmit and receive data to and from each other is shown;

[0028] Figure 2A The downlink SS and PBCH transmission method of the present disclosure is shown;

[0029] Figure 2B An example of BS sending SSB is shown;

[0030] Figure 3 The present invention shows a channel multiplexing method according to a first embodiment of the present invention;

[0031] Figure 4 The invention shows a channel multiplexing method according to a second embodiment of the present invention;

[0032] Figure 5A The present invention shows a channel multiplexing method according to a third embodiment of the present invention;

[0033] Figure 5B Another channel multiplexing method according to the third embodiment of the present disclosure is shown;

[0034] Figure 6 The fourth embodiment of the present invention provides a channel multiplexing method.

[0035] Figure 7 The present invention shows a channel multiplexing method according to a fifth embodiment of the present invention;

[0036] Figure 8 The sixth embodiment of the present disclosure provides a channel multiplexing method.

[0037] Figure 9 The present invention shows a channel multiplexing method according to a seventh embodiment of the present invention;

[0038] Figure 10A The eighth embodiment of the present disclosure provides a channel multiplexing method.

[0039] Figure 10B Another channel multiplexing method according to the eighth embodiment of the present disclosure is shown;

[0040] Figure 11A FIG4 shows a channel multiplexing method according to a tenth embodiment of the present disclosure;

[0041] Figure 11B Another channel multiplexing method according to the tenth embodiment of the present disclosure is shown;

[0042] Figure 12 FIG4 shows a channel multiplexing method according to a tenth embodiment of the present disclosure;

[0043] Figure 13 The invention shows a channel multiplexing method according to the eleventh embodiment of the present invention;

[0044] Figure 14A The invention shows a channel multiplexing method according to a twelfth embodiment of the present invention;

[0045] Figure 14B Another channel multiplexing method according to the twelfth embodiment of the present disclosure is shown;

[0046] Figure 14C Another channel multiplexing method according to the twelfth embodiment of the present disclosure is shown;

[0047] Figure 15 An example of operations for multiplexing an initial access channel in a millimeter frequency band of a BS according to some embodiments of the present disclosure is shown;

[0048] Figure 16 An example of an operation of multiplexing an initial access channel in a millimeter frequency band of a BS according to another embodiment of the present disclosure is shown;

[0049] Figure 17 An example of an operation of multiplexing an initial access channel in a millimeter frequency band of a BS according to another embodiment of the present disclosure is shown;

[0050] Figure 18 An example of an operation for multiplexing an initial access channel in a millimeter frequency band of a BS according to another embodiment of the present disclosure is shown;

[0051] Figure 19 An example of an operation in which a UE receives an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure is shown;

[0052] Figure 20 An example of an operation in which a UE receives an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure is shown;

[0053] Figure 21 An example of an operation in which a UE receives an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure is shown;

[0054] Figure 22 An example of an operation in which a UE receives an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure is shown;

[0055] Figure 23 A BS device capable of running embodiments of the present disclosure is shown; and

[0056] Figure 24 A UE device capable of performing embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0057] Discussed below Figures 1A to 24 The various embodiments used to describe the principles of the present disclosure in this patent document are illustrative only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any suitably arranged system or device.

[0058] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0059] When describing the embodiments of the present disclosure, descriptions related to technical contents well known in the art and not directly related to the present disclosure will be omitted. Such unnecessary omissions are intended to prevent the main idea of the present disclosure from being obscured and to convey the main idea more clearly.

[0060] 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 the accompanying drawings, the same or corresponding elements are provided with the same reference numerals.

[0061] The advantages and features of the present disclosure and the manner in which they are achieved will be apparent by reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be implemented in a variety of different forms. The following embodiments are provided only to fully disclose the present disclosure and to inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0062] 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 means for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to act in a specific manner so that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means for implementing 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 to cause a series of operating steps to be 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 for implementing the functions specified in one or more flowchart blocks.

[0063] In addition, each frame of the flowchart diagram can represent a module, fragment or part of code, which includes one or more executable instructions for realizing the logical function (s) specified. It should also be noted that in some alternative embodiments, the functions mentioned in the frame can occur out of sequence. For example, two frames shown in succession can actually run substantially simultaneously, or these frames can sometimes run in reverse order, depending on the functions involved.

[0064] As used herein, "unit" refers to a software element or a hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have the meaning that is limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to run one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processing, functions, attributes, processes, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into a smaller number of elements or "units", or divided into a larger number of elements or "units". In addition, element and "unit" can be implemented as one or more CPUs in a reproduction device or a secure multimedia card. In addition, "unit" in an embodiment can include one or more processors.

[0065] In the following disclosure, uplink (UP) refers to a wireless link through which a terminal (user equipment (UE) or mobile station (MS)) sends data or a control signal to a base station (eNodeB, gNB or BS), and downlink (DL) refers to a wireless link through which a BS sends data or a control signal to a UE. The fifth generation communication system (or 5G system or new radio (NR) system) is a communication system following the fourth generation communication system (4G system, for example, long term evolution (LTE) or evolved universal terrestrial radio access (E-UTRA)) and has been developed to freely reflect various requirements of users and service providers. Services considered for the 5G communication system may include enhanced mobile broadband (eMBB) communication aimed at high-speed transmission of high-capacity data, massive machine type communication (mMTC) for minimizing UE power and access of multiple UEs, and ultra-reliability low-latency communication (URLLC) aimed at high reliability and low latency. Different requirements may be applied depending on the type of service applied to the UE.

[0066] Embodiments of the present disclosure are used in a communication system in which a base station (BS) in a NR system transmits downlink signals to a user equipment terminal (UE). The NR downlink signals include a data channel for transmitting data information, a control channel for transmitting control information, and a reference signal (RS) for channel measurement and channel feedback.

[0067] Specifically, the NR BS sends data and control information to the UE through the physical downlink shared channel (PDSCH) and the physical downlink control channel (PDCCH), respectively. The NR BS may have multiple reference signals, and the multiple reference signals may include one or more of the channel state information RS (CSI-RS), the demodulation RS, and the UE-specific RS (DMRS). The NR BS may send a UE-specific reference signal (DMRS) only in the area scheduled to send data, and send the CSI-RS in the time and frequency axis resources in order to obtain channel information for data transmission. The transmission and reception of the data channel may be understood as the transmission and reception of data on the data channel, and the transmission and reception of the control channel may be understood as the transmission and reception of control information on the control channel.

[0068] In wireless communication systems, communication between the base station (BS) and the user equipment (UE) is profoundly affected by the propagation environment. In particular, in the 60 GHz frequency band, signal attenuation due to water and oxygen in the atmosphere is very large, and due to the short wavelength, it is difficult to transmit signals with a small scattering effect. Therefore, the BS can only ensure coverage when transmitting signals at higher power. When using high transmit power to transmit signals, it is difficult to use multi-carrier transmission technology with excellent performance to overcome the multipath delay effect in 4G systems due to the peak-to-average power ratio (PAPR). However, performing single-carrier transmission to use higher transmit power has the problem of difficulty in performing user multiplexing, and the channel estimation and channel estimation performance of multipath signals deteriorate. In millimeter waves, analog beams (hereinafter, used interchangeably with beams and understood in this disclosure as signals with directionality) are used to overcome high path loss. However, since the wavelength of millimeter waves is very short, the bandwidth of the analog beams is reduced, making it more difficult to support multiple users in this case. As a result, it is difficult to guarantee the performance of millimeter wave band systems at the technical level used in microwave bands.

[0069] Therefore, the present disclosure proposes a method and apparatus for effectively supporting user multiplexing through a single carrier in a millimeter wave frequency band, and the method and apparatus relate to a scenario in which a BS operates a single carrier.

[0070] Figure 1A The time-frequency domain structure of the NR system resource area is shown.

[0071] exist Figure 1A In the , the horizontal axis is the time domain and the vertical axis is the frequency domain. The basic unit of resources in the time domain and frequency domain is the resource element (RE) 101, which can be defined as 1 orthogonal frequency division multiplexing (OFDM) symbol 102 on the time axis and 1 subcarrier 103 on the frequency axis. In the frequency domain, (eg, 12) consecutive REs may correspond to one resource block (RB) (or physical resource block (PRB)) 104 .

[0072] Figure 1B The time slot structure considered for the NR system is shown.

[0073] exist Figure 1B , an example of the structure of a frame 130, a subframe 131, and a time slot 132 is shown. One frame 130 may be defined as 10 ms. One subframe 131 may be defined as 1 ms, and thus one frame 130 may consist of a total of 10 subframes 131. One time slot 132 or 133 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). One subframe 131 may include one or more time slots 132 and 133, and the number of time slots 132 or 133 per subframe 131 may vary according to the configured value μ134 or μ135 of the subcarrier spacing. Figure 1B The subcarrier spacing configuration values μ = 0 134 and μ = 1 135 are shown by way of example. In the case of μ = 0 134, one subframe 131 may include one time slot 132. In the case of μ = 1 135, one subframe 131 may include two time slots 133. That is, the number of time slots per subframe is The number of time slots per frame can vary depending on the configured value μ of the subcarrier spacing and Can vary depending on it. and Depending on the subcarrier spacing configuration value μ, it can be defined as the following [Table 1].

[0074]

Table 1

[0075]

[0076] Figure 1C A communication system in which a BS and a UE transmit and receive data to and from each other is shown.

[0077] refer to Figure 1C The transmitter is a system capable of performing OFDM transmission and can transmit a single carrier (SC) in a bandwidth capable of OFDM transmission. The transmitter 170 may include a plurality of serial-to-parallel (SP) converters 173 and 174, a plurality of single-carrier precoders 174 and 175, an inverse fast Fourier transform (IFFT) unit 177, a parallel-to-serial (PS) converter 179, a cyclic prefix (CP) inserter 181, an analog signal unit 183 (including a digital-to-analog converter and RF), and an antenna module 185.

[0078] The first data 171, which has undergone channel coding and modulation, is converted into a parallel signal by a serial-to-parallel converter 173, mapped to an SC precoder 175 according to the occupied bandwidth, and converted into a single carrier waveform (SCW) by the SC precoder 175. Furthermore, the second data 172, which has undergone channel coding and modulation, is converted into a parallel signal by a serial-to-parallel converter 174, mapped to an SC precoder 176 according to the occupied bandwidth, and converted into a single carrier waveform (SCW) by the SC precoder 176. In this case, the first data 171 and the second data 172 may be data transmitted through different channels, data and signals transmitted through a channel, different signals, data transmitted through the same channel, or the same signal.

[0079] The device 175 for converting the parallel signal into the SCW can be implemented by various methods, including, for example, a method using a discrete Fourier transform (DFT) precoder, a method using upconversion, and a method using code spreading. The present disclosure may include various precoding methods. Although the present description is based on the SCW generation method using the DFT precoder for understanding the present disclosure, the embodiments of the present disclosure can be equally applied to the case of generating the SCW using another method.

[0080] At this time, the size of the DTF 175 is M1, and the size of the DFT 176 is M2, and the data signal that has passed through the DFT precoder 175 (or DFT filter) having a length of M1 and the data signal that has passed through the DFT precoder 176 having a length of M2 are converted into a wideband frequency signal by the N-point IFFT unit 177. Although the N-point IFFT processor processes transmission of parallel signals by each subcarrier of a channel bandwidth divided into N subcarriers, Figure 1C DFT precoding is performed before the N-point IFFT processor in the IFFT processor, so the signal after the IFFT is transmitted using a single carrier. The signal (data) processed by the N-point IFFT is stored as N samples through the parallel-to-serial converter 179. Some of the N stored samples at the end are copied and concatenated with the samples at the beginning. This processing is performed by the CP inserter 181.

[0081] Thereafter, the signal is sent to the analog signal unit 183 via a pulse shaping filter such as a raised cosine filter, and is converted into an analog signal via a digital-to-analog conversion process such as a power amplifier (PA), and the converted analog signal is sent to the antenna module 185 and radiated into the air.

[0082] A general SCW signal can be transmitted while mapping M precoded signals to M consecutive subcarriers, and such processing can be performed by the IFFT unit 177. Therefore, M is determined according to the size of the transmitted data or the number of time symbols used to transmit the data. Generally, M is much smaller than N because the SCW corresponds to a signal having a small peak-to-average power ratio (PAPR) due to its characteristics.

[0083] PAPR is the degree of variation in the transmit power of a transmitted signal sample. A high PAPR means the transmitter's PA has a large dynamic range, which means a large power margin is required to operate the PA. In this case, the transmitter configures the available PA margin to be high in the presence of significant variation, reducing the maximum power the transmitter can use. This results in a reduction in the maximum communication range between the transmitter and receiver. On the other hand, when SCW has a low PAPR, the PA variation is minimal, so even with a small margin, the PA can still be operated. This increases the maximum communication range.

[0084] Because millimeter-wave wireless communication systems experience high propagation attenuation, ensuring communication range is crucial. Therefore, it's advantageous for base stations to utilize technologies such as SCW to increase maximum communication range. SCW typically has a margin of 5 to 6 dB higher than multi-carrier waveforms (MCW), allowing SCW transmitters to use higher transmission power than MCW, thereby increasing communication range. Figure 1C The SCW shown in [1] is used by UEs with a small upper limit on maximum transmit power (e.g., uplink), and is specifically used for uplink transmission in LTE systems. In particular, since the upper limit on maximum transmit power is not large, the UE cannot configure M to be large due to a lack of uplink transmit power. Furthermore, when transmit power is low, M further decreases, and thus communication range cannot be guaranteed.

[0085] Since the BS receives signals transmitted by a single UE in the uplink, there is no need to consider the situation where one or more UEs transmit signals via the same single carrier. On the other hand, in the case of millimeter wave wireless systems, propagation attenuation can cause power shortages in the downlink. In the case of downlink transmission, the BS must simultaneously transmit signals to one or more UEs, making it necessary to support this.

[0086] Before the following description, for the frequency regions (FR) supported by 5G NR, the frequency region equal to or lower than 6 GHz is referred to as FR1, the frequency region equal to or higher than 6 GHz and equal to or lower than 24 GHz is referred to as FR3, the frequency region higher than or equal to 24 GHz and equal to or lower than 52.6 GHz is referred to as FR2, and the frequency region higher than or equal to 52.6 GHz and equal to or lower than 114.6 GHz is referred to as FR4. The present disclosure assumes that the first waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) and the second waveform is a single carrier waveform. The present disclosure can be applied to all single carrier waveforms, but for ease of description, a DFT-spread OFDM (DFT-s-OFDM) waveform is assumed and described. This is because the same description of resource allocation for CP-OFDM can be applied to DFT-s-OFDM.

[0087] In the present disclosure, the first synchronization signal is a primary synchronization signal (PSS) or a signal corresponding to its function, and the second synchronization signal is a secondary synchronization signal (SSS) or a signal corresponding to its function. The third synchronization signal is a signal having the same function as the first synchronization signal but with a different waveform and resource allocation, and the fourth synchronization signal is a signal having the same function as the second synchronization signal but with a different waveform and resource allocation. In the following, the DMRS for receiving the PBCH is transmitted earlier in time than the PBCH. If no description is required, the content of the DMRS transmission may be omitted, or the broadcast signal may include both the PBCH channel for initial access to system information and the DMRS for reconstructing it. The control channel (PDCCH) for transmitting downlink control information (DCI) for system information transmission and the data channel (PDSCH) for transmitting system information may be multiplexed with the broadcast signal in the same manner as the method for transmitting the broadcast signal (PBCH).

[0088] Next, we will describe the synchronization signal (SS) / physical broadcast channel (PBCH) block (interchangeably used with the synchronization signal block (SSB)) in the 5G system. The SS / PBCH block is a physical layer channel block that includes the primary SS (PSS), secondary SS (SSS), and PBCH. One or more of the multiple SS / PBCH blocks can be transmitted within 5ms, and each of the transmitted SS / PBCH blocks can be distinguished by an index. Specifically, the SS / PBCH block includes the following signals and channels.

[0089] PSS: indicates a signal that serves as a standard for downlink time and frequency synchronization and provides some information of a cell ID.

[0090] SSS: A signal that serves as a standard for downlink time and frequency synchronization and provides information about the remaining cell ID that is not provided by the PSS. In addition, the SSS can be used as a reference signal for demodulating the PBCH.

[0091] PBCH: The Master Information Block (MIB) transmitted through the PBCH provides the necessary system information required for the UE to send and receive data channels and control channels (PBCH can be used interchangeably with broadcast signals). The necessary system information may include search space-related control information indicating the radio resource mapping information of the control channel and scheduling control information for a separate data channel for sending system information. Specifically, the information included in the MIB includes the most significant bit (MSB) of the SS / PBCH block index, a half-frame timing indicator, system frame number information, system information block (SIB) 1, subcarrier spacing (SCS) information for initial access, SSB subcarrier offset information, DMRS position information for PDSCH, control region (control resource set (CORESET)) configuration information for sending DCI scheduling SIB 1, and search space configuration information. The control region configured by the control region configuration information included in the MIB may be referred to as control region #0.

[0092] The UE can detect the PSS and SSS during the initial access phase and decode the PBCH. The UE can obtain the MIB from the PBCH and receive the configuration of control region #0 from it. The UE monitors control region #0 based on the control region configuration information and search space configuration information and receives system information (SIB1) scheduled by the downlink control information (DCI) transmitted in control region #0.

[0093] The UE can obtain configuration information related to the random access channel (RACH) required for initial access from the received system information. Taking into account the SS / PBCH index selected by the UE, the UE can send a random access (RA) preamble to the base station. The base station that receives the RA preamble can obtain information about the SS / PSBH block index selected by the UE from the base station that received the RA preamble. Through this process, the base station can know which block the UE selected from the SS / PBCH block and that the UE monitors the control region #0 associated with it.

[0094] Figure 2A The downlink SS and PBCH transmission method of the present disclosure is shown. Figure 2AThe SSB includes the SS and PBCH 203, and the SS is divided into the PSS 205 and SSS 207. The SSB occupies four symbols 201, and the frequency band occupied by the PSS 205 and SSS 207 is 12 RBs, indicated by reference numeral 211. In practice, 127 subcarriers 213 are occupied. On the other hand, the PBCH occupies a total of 20 RBs, indicated by reference numeral 209. In the case of the PSS, there are unoccupied portions on both sides of the 127 subcarriers. In the case of the SSS, the PBCH occupies portions on both sides of the 127 subcarriers. The unused power of the unoccupied resources can be used to boost the power of the PSS and SSS. The unused region between the SSS and PBCH serves as a reserved interval for applying the receive filters for the PSS and SS. Control region #0 is a control channel region 229 (CORESET) used to transmit scheduling information to the UE. It is allocated a size 227, which is a multiple of 6 RBs, before the time symbol where the SSB is transmitted. CORESET allocation information is transmitted via the PBCH. Since CORESET and SSB are transmitted through the same symbol, it is assumed that the two areas transmitted simultaneously are transmitted using the same beam.

[0095] Figure 2B An example of a BS transmitting an SSB is shown. The most notable feature of NR SSB is that a BS 215 uses one or more beams 217 and 219 to compensate for radio signal attenuation. If a BS uses L beams, a cell transmits L SSBs in different time symbols, as shown by reference numerals 223 and 225. Furthermore, the SSBs transmitted by a BS use the same BS ID but different unique SSB IDs (or SS / PBCH block indices).

[0096] Figure 3 The channel multiplexing method according to the first embodiment proposed in the present disclosure is shown. According to the first embodiment, the BS can send the first synchronization signal and the second synchronization signal through time and frequency resources different from the broadcast signal, and the size of the single carrier bandwidth of the synchronization signal can be different from the size of the single carrier bandwidth of the broadcast signal. The UE searches for cells in FR1, FR2, and FR3, uses the first waveform to receive the broadcast signal, and receives and reconstructs the first synchronization signal and the second synchronization signal as well as the broadcast signal, and searches for cells in FR4, assuming that the second waveform is used to receive the broadcast signal, and receives and reconstructs the first synchronization signal and the second synchronization signal as well as the broadcast signal.

[0097] refer to Figure 3The first synchronization signal 301 and the second synchronization signal 303 included in the SSB 305 are transmitted in a frequency band 307 occupying a PRB size of M1, and the bandwidth of the second waveform (i.e., a single carrier) is the same size as the product of the sequence length of signals 301 and 303 and the applied SCS, as shown in reference numeral 311. Meanwhile, the broadcast signal includes a reference signal (DMRS) 315 for reconstructing the broadcast signal and broadcast signal transmission symbols 317. The time symbols and bandwidth occupied by signals 301 and 303 may differ from the time symbols and bandwidth occupied by signals 315 and 317. The bandwidth occupied by signals 315 and 317 has a PRB size of M2 309, and M2, which is the bandwidth size of the second waveform used to transmit signals 315 and 317, may be configured regardless of M1. In this case, on the time axis, the synchronization signal and the broadcast signal may be transmitted symbol by symbol in the order of DMRS 315, PSS 301, PBCH 317, and SSS 303. According to the proposed first embodiment, the BS can transmit the synchronization signal and the broadcast signal in different resources, and use the power of the unused resources to simultaneously amplify the power, and use the second waveform to ensure low PAPR, thereby increasing the overall coverage of both channels. Since the DMRS is located in the front symbol (frontload) of the SSB, efficient PBCH demodulation can be performed.

[0098] Figure 4 The channel multiplexing method according to the second embodiment proposed in the present disclosure is shown. According to the second embodiment, the BS sends a first synchronization signal and a second synchronization signal in the same symbol as the broadcast signal and a different frequency bandwidth. Odd-numbered (or even-numbered) subcarriers are used to send the broadcast signal sent in the same symbol as the synchronization signal, and in this case, even-numbered (or odd-numbered) subcarriers are used to send the synchronization signal sent in the same symbol as the broadcast signal. This is to prevent the broadcast signal and the synchronization signal from overlapping each other in a time sample during the transmission of a single carrier. The UE can search for cells of FR1, FR2, and FR3, use the first waveform to receive the broadcast signal, and receive and reconstruct the first synchronization signal and the second synchronization signal as well as the broadcast signal, and can search for cells of FR4, assume the second waveform to receive the broadcast signal, and receive and reconstruct the first synchronization signal and the second synchronization signal as well as the broadcast signal.

[0099] refer to Figure 4, the first synchronization signal 401 and the second synchronization signal 403 included in the SSB 405 are transmitted in a frequency band 407 occupying a PRB size M1, and the bandwidth M0 411 of the second waveform is the same size as the product of double the sequence length of reference numerals 401 and 403 and the applied SCS. On the other hand, the broadcast signal includes a reference signal 413 and a broadcast signal transmission symbol 415 for reconstructing the broadcast signal, and resource allocation 419 of the bandwidth occupied by reference numerals 401 and 403 may be different from resource allocation 417 of the bandwidth occupied by reference numerals 413 and 415. The size M2 409 of the bandwidth occupied by reference numerals 413 and 415 can be configured regardless of M0 411, but it is preferable to configure M2 = M0. On the time axis, DMRS 413 and PSS 401 occupy the odd-numbered (even-numbered) and even-numbered (odd-numbered) time samples of a symbol corresponding to the first symbol, respectively. PBCH 415 is transmitted in the second symbol. PBCH 415 and SSS 403 occupy the odd-numbered (even-numbered) and even-numbered (odd-numbered) time samples of a symbol corresponding to the third symbol, respectively. PBCH 415 is transmitted in the fourth symbol. According to the second embodiment, SSB uses four symbols, thereby improving compatibility with legacy NR systems. Synchronization signals and broadcast signals can occupy different bandwidths, thereby reducing the PAPR of the time symbol and improving coverage.

[0100] Figure 5A A channel multiplexing method according to a third embodiment proposed in the present disclosure is shown. According to the third embodiment, the BS sends a second synchronization signal in the same symbol as the broadcast signal and in a different frequency bandwidth. The first synchronization signal is sent using a first waveform, and the second synchronization signal is sent using a second waveform. The BS uses odd-numbered (or even-numbered) subcarriers for the broadcast signal sent in the same symbol as the second synchronization signal, and uses even-numbered (or odd-numbered) subcarriers for the synchronization signal sent in the same symbol as the broadcast signal. The UE searches for cells of FR1, FR2, and FR3, receives the broadcast signal using the first waveform, and receives and reconstructs the first synchronization signal and the second synchronization signal as well as the broadcast signal, and searches for cells of FR4, assuming the first waveform to receive the broadcast signal, assuming the second waveform to receive and reconstruct the first synchronization signal, and receives and reconstructs the second synchronization signal and the broadcast signal.

[0101] refer to Figure 5A510, a first synchronization signal 501 and a second synchronization signal 503 are transmitted in a frequency band 505 occupying a PRB size M1, and the bandwidth M0 507 of the second waveform is the same as the product of the sequence length of the DMRS 511 and the applied SCS. The broadcast signal includes a reference signal 511 for reconstructing the broadcast signal and a broadcast signal transmission symbol 513. The BS transmits the first synchronization signal 501 using the first waveform and the second synchronization signal 503 using the second waveform. As shown in reference numeral 515, the broadcast signal 513 is transmitted in the same symbol as the second synchronization signal 503 using odd-numbered (or even-numbered) subcarriers. As shown in reference numeral 517, the second synchronization signal 503 is transmitted in the same symbol as the broadcast signal 513 using even-numbered (or odd-numbered) subcarriers. The first synchronization signal 501 and the second synchronization signal 503 may be transmitted in M1 PRBs 505 , in which case the bandwidth M0 509 of the second wavelength applied to the second synchronization signal 503 may be the same as the size 507 .

[0102] Figure 5B Another channel multiplexing method according to the third embodiment of the present disclosure is shown. According to the third embodiment, the location of the DMRS used for broadcast signals can vary. In b 520, an example of transmitting the DMRS at a different location than in a 510 is shown. In b 520, unlike in a 510, DMRS 527 is located in the first symbol of the SSB, while the second synchronization signal 521 and PBCH 529 are multiplexed in the fourth symbol of the SSB. In this case, as shown in 510, cross-subcarrier resources can be used to transmit the multiplexed second synchronization signal 521 and PBCH 529. According to the third embodiment, the second waveform bandwidth 525 applied to DMRS 527 and PBCH 529 can be 12 RBs. According to the proposed third embodiment, the first synchronization signal is transmitted using the first waveform. Therefore, the UE can receive the first synchronization signal based on the assumption that the same first synchronization signal is transmitted regardless of the frequency band of the cell used to transmit the SSB. Furthermore, since the first synchronization signal is transmitted using the first waveform, despite the high PAPR, no signals are transmitted in the same symbol, thereby improving coverage due to power amplification. Since the second synchronization signal and the broadcast signal occupy different bandwidths, transmission can be performed with a low PAPR of time symbols, and thus coverage can be improved.

[0103] Figure 6The channel multiplexing method according to the fourth embodiment proposed in the present disclosure is shown. According to the fourth embodiment, the base station transmits the first synchronization signal and the second synchronization signal in a different symbol and a different frequency bandwidth than the broadcast signal, and transmits the first synchronization signal and the second synchronization signal using a first waveform. The first synchronization signal and the second synchronization signal can be transmitted using an M sequence. The base station transmits the third synchronization signal and the fourth synchronization signal in the same symbol or a different frequency band as the broadcast signal, and transmits the third synchronization signal and the fourth synchronization signal using a second waveform. The third synchronization signal and the fourth synchronization signal can be transmitted using a Zadoff-Chu (ZC) sequence.

[0104] The BS uses odd-numbered (or even-numbered) subcarriers to send a broadcast signal sent in the same symbol as the third synchronization signal and the fourth synchronization signal, and uses even-numbered (or odd-numbered) subcarriers to send the third synchronization signal and the fourth synchronization signal. That is, the BS sends the broadcast signal and the third synchronization signal and the fourth synchronization signal through crossed subcarrier resources so that time samples do not overlap with each other in a single carrier. The UE can search for cells in FR1, FR2, and FR3, use the first waveform to receive the broadcast signal, and reconstruct the first synchronization signal and the second synchronization signal and the broadcast signal, and can search for cells in FR4, assume the first waveform to receive the broadcast signal, receive and reconstruct the first synchronization signal and the second synchronization signal, and receive and reconstruct the third synchronization signal and the fourth synchronization signal and the broadcast signal based on the assumption of the second waveform. The UE can first attempt to receive the first synchronization signal and the second synchronization signal in FR1, FR2, and FR3, and can first attempt to receive the third synchronization signal and the fourth synchronization signal in FR4.

[0105] refer to Figure 6The BS transmits a first synchronization signal 601 and a second synchronization signal 603 in a first frequency band using a first waveform to transmit an SSB 617, and transmits a third synchronization signal 619 and a fourth synchronization signal 621 in the same frequency band using a second waveform. The second waveform bandwidth applied to the third synchronization signal 619 and the fourth synchronization signal 621 may be the same as the 127 subcarrier spacing indicated by reference numeral 609. The number of subcarriers occupied by the second waveform may be greater than or equal to the number of subcarriers occupied by the first and second synchronization signals, but should be equal to or less than the number of PRBs 605 occupied by the first synchronization signal. The third synchronization signal 619 and the fourth synchronization signal 621 are transmitted in the same symbol as the broadcast signal 615, and the resource allocation between the third synchronization signal 619 and the fourth synchronization signal 621 and the broadcast signal 615 does not overlap. That is, the third synchronization signal 619 and the fourth synchronization signal 621 are transmitted using even-numbered (odd-numbered) subcarriers among the subcarriers occupying the bandwidth, and the broadcast signal 615 is transmitted using odd-numbered (even-numbered) subcarriers. The signal bandwidth 607 occupied by the DMRS 613 and the broadcast signal 615 can have a PRB size of M2 (or the second waveform bandwidth 611 applied to the DMRS 613 and the broadcast signal 615 can have a PRB size of M2), and M2 should be greater than or equal to the size M1 (the number of PRBs) of the signal bandwidth 605 occupied by the synchronization signals 601, 603, 619 and 621, and preferably M1 = M2.

[0106] According to the proposed fourth embodiment, the UE can receive system information or some of it using the synchronization signal using the first waveform and the second waveform. That is, since the first synchronization signal and the second synchronization signal of the same resource structure can be transmitted regardless of the frequency band of the cell, the UE (of the FR4 cell) supporting the traditional 5G system can detect the first synchronization signal and the second synchronization signal, and the UE of the FR4 cell may or may not detect the first synchronization signal and the second synchronization signal. In addition, since another signal is not transmitted in the symbol in which the first synchronization signal and the second synchronization signal are transmitted, there are the following advantages: although the first waveform has a high PAPR, the coverage of the first synchronization signal and the second synchronization signal is guaranteed by amplifying the power using the power of the corresponding unused resources, and since the third synchronization signal and the fourth synchronization signal and the broadcast signal use the second waveform with different resource configurations, wide coverage is guaranteed with low PAPR.

[0107] Figure 7The channel multiplexing method of the fifth embodiment proposed in the present disclosure is shown. According to the fifth embodiment, the BS can send the first synchronization signal, the second synchronization signal, the third synchronization signal and the fourth synchronization signal in the same symbol and different frequency bandwidth as the DMRS and the broadcast signal. At this time, the BS can use odd-numbered (or even-numbered) subcarriers to send the broadcast signal and use even-numbered (or odd-numbered) subcarriers to send the synchronization signal. That is, in the fifth embodiment, the BS can send the first synchronization signal and the second synchronization signal to overlap with each other. The UE can search for cells in FR1, FR2 and FR3, use the first waveform to receive the broadcast signal, receive and reconstruct the first synchronization signal and the second synchronization signal and the broadcast signal, search for cells in FR4, assume the second waveform to receive the broadcast signal, and receive and reconstruct the first synchronization signal and the second synchronization signal or receive and reconstruct the third synchronization signal and the fourth synchronization signal and the broadcast signal based on the assumption of the second waveform. The UE can first attempt to receive the first synchronization signal and the second synchronization signal in FR1, FR2 and FR3, and first attempt to receive the third synchronization signal and the fourth synchronization signal in FR4.

[0108] refer to Figure 7 The first bandwidth occupies M1 PRBs 705, and the first synchronization signal 701, second synchronization signal 703, third synchronization signal 719, and fourth synchronization signal 721 are transmitted via a second waveform within SSBs 717. A second waveform bandwidth 709 applied to synchronization signals 701, 703, 719, and 721 is included within M1 PRBs 705. Broadcast signals 713 and 715, including DMRS, are transmitted in the same symbols as the synchronization signals but with different bandwidths. The bandwidth 707 occupied by DMRS and broadcast signals 713 and 715 is transmitted over an area of M2 PRBs. In this case, the subcarriers used in the first frequency band 705 and the subcarriers used in the second frequency band 707 do not overlap, and the BS can use odd-numbered subcarriers in the first frequency band and even-numbered subcarriers in the second frequency band, for example, using a comb scheme. Furthermore, the second waveform bandwidth 711 applied to DMRS 713 and broadcast signal 715 may be the same as reference numeral 707. In this case, the symbols transmitted by the BS may maintain the PAPR at the same level as a single-carrier waveform.

[0109] Figure 8The channel multiplexing method according to the sixth embodiment proposed in the present disclosure is shown. According to the sixth embodiment, the BS sends a first synchronization signal (including DMRS) in the same symbol and different frequency bandwidth as the broadcast signal, and at this time, the first synchronization signal is sent using a first waveform. The BS sends a second synchronization signal, a third synchronization signal, and a fourth synchronization signal in the same symbol and different frequency as the broadcast signal, and uses a second waveform to send the second synchronization signal, the third synchronization signal, and the fourth synchronization signal. The BS can use odd-numbered (or even-numbered) subcarriers to send the broadcast signal sent in the same symbol as the second synchronization signal, the third synchronization signal, and the fourth synchronization signal, and use even-numbered (or odd-numbered) subcarriers to send the synchronization signal. The UE can search for cells in FR1, FR2, and FR3, receive the broadcast signal using the first waveform, receive and reconstruct the first synchronization signal and the second synchronization signal as well as the broadcast signal, search for cells in FR4, assume the first waveform to receive the broadcast signal, receive and reconstruct the first synchronization signal, receive and reconstruct the second synchronization signal based on the assumption of the second waveform, and receive and reconstruct the third synchronization signal and the fourth synchronization signal as well as the broadcast signal based on the assumption of the second waveform. The UE may first attempt to receive the first synchronization signal and the second synchronization signal in FR1, FR2, and FR3, and first attempt to receive the third synchronization signal and the fourth synchronization signal in FR4.

[0110] refer to Figure 8The BS transmits a first synchronization signal 801 using a first waveform in a first bandwidth 805 and transmits a second synchronization signal 803, a third synchronization signal 817, and a fourth synchronization signal 819 in the first bandwidth 805 using a second waveform in an SSB 821. At this time, the BS transmits broadcast signals 813 and 815 including DMRS using a second waveform in a second bandwidth 807. The first bandwidth 805 may be the same size as M1 PRBs, and the second waveform bandwidth 809 applied to the second synchronization signal 803, the third synchronization signal 817, and the fourth synchronization signal 819 is included in the first bandwidth 805. The second bandwidth 807 may be the same size as M2 PRBs, and the second waveform bandwidth 811 applied to the broadcast signals 813 and 815 including DMRS may be the same as the second bandwidth 807. However, in the symbols in which the first synchronization signal 801 using the first waveform is transmitted, no signal is transmitted in the second bandwidth. In symbols where the broadcast signal 815 overlaps with the second synchronization signal 803, the third synchronization signal 817, and the fourth synchronization signal 819, different subcarrier resources can be used for each frequency band. That is, the BS uses even-numbered (or odd-numbered) subcarriers to transmit signals transmitted in the first bandwidth 805, and uses odd-numbered (or even-numbered) subcarriers to transmit signals transmitted in the second bandwidth 807. On the other hand, all subcarrier resources can be used to transmit the broadcast signal 815 of the fifth symbol, which does not overlap with the synchronization signal in the time symbol. The gain of the proposed method is the same as that of the fifth embodiment.

[0111] Figure 9 The channel multiplexing method according to the seventh embodiment proposed in the present disclosure is shown. According to the seventh embodiment, the BS may transmit a broadcast signal in a bandwidth including a transmission bandwidth of a first synchronization signal and a second synchronization signal, transmit a broadcast signal using a second waveform through a first single carrier frequency band in a symbol in which no synchronization signal is transmitted, and transmit a broadcast signal using a second waveform through a second single carrier frequency band in a symbol in which a synchronization signal is transmitted. The UE may search for cells of FR1, FR2, and FR3, receive a broadcast signal using the first waveform, receive and reconstruct the first synchronization signal and the second synchronization signal and the broadcast signal, search for cells of FR4, receive a broadcast signal assuming the second waveform, and receive and reconstruct the first synchronization signal and the second synchronization signal and the broadcast signal. In addition, the UE may receive and reconstruct the broadcast signal of FR4 using different second waveform bandwidths (single carrier bandwidths) for respective symbols.

[0112] refer to Figure 9In the first symbol of an SSB, the BS transmits a first synchronization signal 901 using a first waveform in a first bandwidth M1 905, and in the second symbol, transmits a DMRS 915 using a second waveform in a bandwidth 911 (third bandwidth) having a size of M1+M2 PRBs including M1. In the third symbol, a second synchronization signal 903 and a broadcast signal 913 are transmitted together using the second waveform. When broadcast signal 913 is transmitted in the same symbol as second synchronization signal 903 (e.g., the third symbol of an SSB), broadcast signal 913 is transmitted in a second frequency band 907 corresponding to M2 PRBs, and second synchronization signal 903 and broadcast signal 913 are allocated to different resources in the corresponding symbols. That is, broadcast signal 913 uses odd-numbered (or even-numbered) resources of the subcarriers, and second synchronization signal 903 uses even-numbered (or odd-numbered) resources. In the fourth symbol, broadcast signal 915 is transmitted using the second waveform with a size of M1+M2. According to the proposed embodiment, the UE can identify the waveform of the second synchronization signal and detect whether the corresponding SSB is based on the first waveform or the second waveform. In addition, the UE can determine which information to send, among the MIB information assumed to be used based on the first waveform and the MIB information assumed to be used based on the second waveform, by identifying the waveform of the second synchronization signal.

[0113] Figure 10A The channel multiplexing method according to the eighth embodiment proposed in the present disclosure is shown. According to the proposed eighth embodiment, the BS can transmit a broadcast signal in a wider bandwidth including a transmission bandwidth for transmitting a first synchronization signal and a second synchronization signal. The first synchronization signal and the second synchronization signal can be transmitted using a first waveform, and the broadcast signal can be transmitted using a second waveform. The UE can search for cells in FR1, FR2, and FR3, receive the broadcast signal using the first waveform, receive and reconstruct the first synchronization signal and the second synchronization signal and the broadcast signal, search for cells in FR4, receive the broadcast signal assuming the first waveform, receive and reconstruct the first synchronization signal and the second synchronization signal, and receive and reconstruct the broadcast signal based on the assumption of the second waveform.

[0114] refer to Figure 10A , a first synchronization signal 1001 and a second synchronization signal 1003 are transmitted using a first waveform in a first bandwidth 1007 having a size of M1 PRBs. In symbols in which the first synchronization signal and the second synchronization signal are not transmitted, a broadcast signal 1011 including a DMRS is transmitted in a second bandwidth 1005 having a size of M2 PRBs, which is larger than the first bandwidth having a size of M1 PRBs, and the second bandwidth includes the first bandwidth. A second waveform bandwidth 1009 applied to the broadcast signal 1011 may be the same as the second bandwidth 1005. The first bandwidth 1007 and the second bandwidth 1005 may be configured to be Figure 10AEach bandwidth of a 1010 has the same minimum frequency (or maximum frequency) and can be configured to have the same Figure 10B The same center position as shown in B 1020. Figure 10B Another channel multiplexing method according to the eighth embodiment of the present disclosure is shown. In b 1020, the configuration of the first synchronization signal 1013, the second synchronization signal 1015, the broadcast signal 1023, and the second waveform bandwidth 1019, except for the location of the bandwidth, can refer to the description of a 1010. The proposed eighth embodiment includes both a method of transmitting the first and second synchronization signals using the first waveform and the broadcast signal using the second waveform, and a method of transmitting all the first and second synchronization signals and the broadcast signal using the second waveform. This proposed method allows the UE to distinguish different channels in a time symbol, and because no frequency multiplexing is performed, there is an advantage of guaranteed coverage.

[0115] Figure 11A The channel multiplexing method according to the ninth embodiment proposed in the present disclosure is shown. According to the proposed ninth embodiment, the BS sends a first synchronization signal and a second synchronization signal using a first waveform in a first bandwidth, and sends a broadcast signal using a second waveform in a time resource (symbol) different from the first synchronization signal and the second synchronization signal in the first bandwidth. When the bandwidth of the broadcast signal is greater than the bandwidth of the first synchronization signal and the second synchronization signal (or when an additional system signal (e.g., SIB) is sent through the PDCCH or PDSCH), signals of one or more frequency bands are sent in the symbol in which the broadcast signal is sent, and each frequency band may correspond to a separate single carrier frequency band. When signals of two frequency bands are sent in the symbol in which the broadcast signal is sent, odd-numbered (or even-numbered) subcarriers may be used in the first frequency band, and even-numbered (or odd-numbered) subcarriers may be used in the second frequency band. The UE can search for cells of FR1, FR2 and FR3, use the first waveform to receive the broadcast signal, receive and reconstruct the first synchronization signal and the second synchronization signal as well as the broadcast signal, search for cells of FR4, assume the first waveform to receive the broadcast signal, receive and reconstruct the first synchronization signal and the second synchronization signal, and receive and reconstruct another channel including the broadcast signal based on the assumption of the second waveform.

[0116] refer to Figure 11AIn a 1110, a first synchronization signal 1101 and a second synchronization signal 1103 are transmitted in a first bandwidth 1105 having a size of N1 PRBs, and at this time, another signal is not transmitted in another frequency band of the corresponding symbol. The first synchronization signal 1101 and the second synchronization signal 1103 are transmitted using a first waveform. On the other hand, a broadcast signal 1117 is transmitted using a second waveform in the first bandwidth 1105. The broadcast signal 1117 may be transmitted to convey system information for initial access in the first bandwidth 1105. When the BS needs to transmit additional system information, the BS may configure a control region #0 1109 for access in the same symbol as the broadcast signal 1103 and the second bandwidth 1107 (e.g., the second symbol of the SSB) to transmit the PDCCH, and transmit the additional system information via the PDSCH in the same symbol as the broadcast signal and the second bandwidth 1107 (e.g., the fourth symbol). The second bandwidth 1107 has a size of N2. In this case, the broadcast signal 1103 is transmitted in the same symbol, so the broadcast signal 1103 should use resources different from those of the PDCCH and PDSCH. For example, there may be a method of configuring different comb offsets as indicated by reference numerals 1113 and 1115.

[0117] Figure 11B Another channel multiplexing method according to the ninth embodiment of the present disclosure is shown. When additional DMRS is required, DMRS can be added to the SSB in b 1120. DMRS 1127 can be transmitted in a symbol preceding the first synchronization signal using a frontloading scheme, and in this case, the DMRS can be transmitted using a second waveform. Regarding DMRS sequences, both a method of separately generating sequences of length N1 and length N2 and transmitting them in the first bandwidth 1123 and the second bandwidth 1125, respectively, and a method of generating a sequence of length N1+N2 and transmitting them in the first bandwidth 1123 and the second bandwidth 1125, respectively, can be used.

[0118] Figure 12The channel multiplexing method according to the tenth embodiment proposed in the present disclosure is shown. According to the proposed tenth embodiment, the BS can use the first waveform to send the first synchronization signal and the second synchronization signal in the first bandwidth, and use the second waveform to send the broadcast signal in a time resource (symbol) different from the first synchronization signal and the second synchronization signal in the second waveform, and the bandwidth for sending the broadcast signal can be divided into two bandwidths. Specifically, the first bandwidth can be used to send initial access system information, and the other bandwidth can be used to send additional system signals through PDCCH and PDSCH. When the bandwidth for sending the broadcast signal is divided into two frequency bands, the BS can use odd-numbered (or even-numbered) subcarriers to send signals in the first frequency band and use even-numbered (or odd-numbered) subcarriers to send signals in the second frequency band. The UE can search for cells in FR1, FR2, and FR3, receive the broadcast signal using the first waveform, receive and reconstruct the first synchronization signal and the second synchronization signal and the broadcast signal, search for cells in FR4, assume the first waveform to receive the broadcast signal, receive and reconstruct the first synchronization signal and the second synchronization signal, and receive and reconstruct another channel including the broadcast signal based on the assumption of the second waveform.

[0119] refer to Figure 12, a first synchronization signal 1217 and a second synchronization signal 1219 are transmitted in a first bandwidth 1221 having a size of N1 PRBs, and at this time, no other signal is transmitted in another frequency band in the corresponding symbol. Furthermore, the first synchronization signal 1217 and the second synchronization signal 1219 are transmitted using a first waveform. On the other hand, a broadcast signal 1235 is transmitted using a second waveform in a second bandwidth 1223 having a size of N2. The broadcast signal is transmitted using the second frequency band to transmit system information for initial access. However, when the BS needs to transmit additional system information, a PDCCH in control region #0 1227 for access is transmitted using a third bandwidth 1225 having a size of N3 in the same symbol as the broadcast signal (e.g., the third symbol of the SSB). Furthermore, the additional system information can be transmitted using a PDSCH 1237 in the third bandwidth 1225 having a size of N3 in the same symbol as the broadcast signal (e.g., the fifth symbol of the SSB). At this time, since the broadcast signal is transmitted in the same symbol as the PDCCH and PDSCH, non-overlapping resources are required for transmission. For example, different comb offsets may be configured as shown in reference numerals 1231 and 1229. When additional DMRS is required, DMRS 1239 may be transmitted in a symbol preceding first synchronization signal 1217 using a frontloading scheme. In this case, the DMRS is transmitted using the second waveform, and the DMRS sequence may be generated using a method of separately generating DMRS sequences of length N1 and length N2 and transmitting the sequences in the second bandwidth 1223 and the third bandwidth 1225, respectively, or generating a sequence of length N2+N3 and transmitting the sequence in the frequency band.

[0120] Figure 13 The channel multiplexing method according to the eleventh embodiment proposed in the present disclosure is shown. According to the eleventh embodiment, the UE can search for cells in FR1, FR2, and FR3, use the first waveform to receive the broadcast signal, receive and reconstruct the first synchronization signal and the second synchronization signal and the broadcast signal, or the UE can search for cells in FR4, use the second waveform to receive the broadcast signal, receive and reconstruct the broadcast signal, and receive an indication of the channel bandwidth of the cell receiving the broadcast signal as one of the operable channel bandwidths through the code points of one or more system information included in the received broadcast signal. In order to search for cells in FR4, the UE can determine the bandwidth (single carrier bandwidth) used for the second waveform as one of the predetermined candidate bandwidths through the subcarrier spacing and the number of subcarriers used, and attempt to receive the system information through one or more reconstruction attempts.

[0121] The method proposed by the eleventh embodiment corresponds to a method for configuring the size of the first bandwidth or the second bandwidth of the synchronization signal using the second waveform according to the channel bandwidth based on the Q factor and the SSB overhead. The Q factor is the ratio of the actual data reception filter 1301 within the channel bandwidth to the channel bandwidth 1303 used to design the RF filter. If the Q factor is large, the complexity of the filter design becomes higher, so the processing time increases and the area occupied by the hardware increases. If the subcarrier spacing is wider, the ratio of the first bandwidth occupied by the SSB to the channel bandwidth increases. If the Q factor is equal to or less than 60 and the ratio of the bandwidth of the SSB to the SSB of the channel bandwidth is configured to be 30% or less, the Q factor according to the channel bandwidth and the subcarrier spacing, the information on whether the Q factor is available, and the first bandwidth are as shown in the following [Table 2].

[0122]

Table 2

[0123]

[0124]

[0125] Since the UE attempts cell access without knowing the channel bandwidth, the UE first receives the SSB based on the predetermined subcarrier spacing candidate according to each frequency band to access the FR4 cell. After receiving the SSB or additional system information, the UE receives system information and identifies information about the channel bandwidth in the form of one or more code points. The method of indicating the information about the channel bandwidth may include a method of indicating the absolute channel bandwidth in the form of code points as shown in [Table 3], and a method of presetting a default bandwidth in the form of code points and indicating the actual bandwidth as shown in [Table 4].

[0126]

Table 3

[0127] Code Point Channel bandwidth 00 200MHz 01 250MHz 10 400MHz 11 500MHz

[0128]

Table 4

[0129]

[0130] The channel bandwidths shown in [Table 3] and [Table 4] are merely examples, and another channel bandwidth within the range shown in [Table 2] may be indicated in the form of a code point.

[0131] The twelfth embodiment describes a method for configuring a channel grid for searching for SSB. The channel grid for searching for SBB can be understood as the center frequency position of SSB. The conventional channel grid search is configured as shown in Table 5 below.

[0132]

Table 5

[0133]

[0134] The relationship between the parameters is described below.

[0135] F REF =F REF-Offs +ΔF Global (N REF -N REF-Offs )

[0136] Therefore, the channel search is performed in units of 60 kHz in a frequency band higher than or equal to 60 GHz. When the channel search is performed in units of 60 kHz, it is impossible to search for a signal of another system (e.g., point-to-point) that can perform frequency occupation in a channel higher than or equal to 60 GHz in units of 250 MHz, and it is impossible to multiplex with other systems in the same frequency band. In this case, in order to facilitate the search for a channel occupied by another system (point-to-point) occupying the corresponding frequency band and ensure a faster channel grid search, the channel grid can be configured as shown in [Table 6] below.

[0137]

Table 6

[0138]

[0139] When the channel grid is configured as shown in [Table 5], a channel search twice as fast as a conventional channel search can be performed while maintaining multiplexing with another system occupying the 250 MHz band.

[0140] When configuring a 70 GHz channel band based on [Table 5], the channel band can be configured by the following method. This is a method for solving the following six problems. The first problem is to configure a frequency division duplex (FDD) channel including an uplink band and a downlink band within the band, the second problem is to configure the channel band as a multiple of 250 MHz, the third problem is to use a time division duplex (TDD) channel also in the 70 GHz band, the fourth problem is to coexist with traditional point-to-point services, and the fifth problem is to use the 75.5 GHz band to protect amateur radio signals. The last problem is to make the size of the FDD duplexer (meaning the interval between the uplink band and the downlink band of the FDD channel) greater than or equal to 2.5 GHz. At this time, the available bandwidth 250, 500, ..., 2250 MHz for the frequency band 71.125 GHz to 75.875 GHz can be configured as follows. This method can also be applied to the 60 GHz, 70 GHz, 80 GHz, 90 GHz and 100 GHz bands. Furthermore, the method can be applied to an FDD system used only for the 70 GHz band as well as to a case where the 70 GHz and 80 GHz bands are used through FDD (in this case, the size of the FDD duplexer is 5 GHz).

[0141] 1) 250 MHz bandwidth: A total of 19 frequency bands with intervals of 250 MHz based on the 71.250 GHz channel grid can be configured as channel bandwidths. Two bandwidths of the FDD duplexer greater than or equal to 2.5 GHz can be FDD pairs.

[0142] 2) 500 MHz bandwidth: Nine frequency bands with 500 MHz intervals based on a 71.5 GHz channel grid, nine frequency bands with 500 MHz intervals based on a 71.650 GHz channel grid, or nine frequency bands with 500 MHz intervals based on a 71.8 GHz channel grid can be configured. Two bandwidths greater than or equal to 2.5 GHz for an FDD duplexer can be FDD pairs.

[0143] 3) Bandwidth higher than or equal to 750 MHz: The channel bandwidth can be configured as the sum of the bandwidths presented in 1) and 2).

[0144] The proposed method can be applied to frequency bands higher than or equal to 70 GHz, in which case the channel grid can be configured as shown in [Table 7] below.

[0145]

Table 7

[0146]

[0147] When the proposed method of configuring the channel grid is applied, the UE can receive SSBs in FR1, FR2, and FR3 based on CP-OFDM, and preferentially search for SSBs in a frequency band from 52.6 GHz to 70 GHz based on CP-OFDM. When the UE fails to receive the CP-OFDM SSB, the UE can search for the SSB based on DFT-s-OFDM, and search for the SSB based on DFT-s-OFDM in a frequency band higher than or equal to 70 GHz. In addition, the UE can search for a predetermined SSB in FR4, receive the MIB or system information block (or system information) based on the SSB, and then identify the type of waveform included in the system information for each channel grid present in each FR4. In addition, the system information may include the type of waveform for each SSB index (understood as an identifier of the SSB) of the SSB present in the channel grid in each FR4. When the UE initially receives SSB based on DFT-s-OFDM or CP-OFDM and then reports the UE capabilities to the BS, the UE may insert the types of waveforms and channels that the UE can receive (for example, various data channels and control channels such as PDCCH, PDSCH, physical uplink shared channel (PUSCH) and physical uplink control channel (PUCCH)) or the types of waveforms that the UE can receive and transmit for each type of signal (for example, DMRS, CSI-RS, PSS or SSS for the above channels) into the capability information and report the UE capability information. When reporting the UE capabilities to the BS, the UE may insert at least one of the types of waveforms and channels that the UE can receive for each channel grid range and signal-related information into the capability information and report the capability information. The capability information may also include the type of waveform that the UE can receive for each available frequency band. For example, the UE may report to the BS its capability for receiving downlink channels and / or signals by CP-OFDM in a bandwidth up to 400 MHz and by DFT-s-OFDM in a frequency band higher than or equal to 400 MHz.

[0148] Figure 14A The channel multiplexing method according to the thirteenth embodiment proposed in the present disclosure is shown. The twelfth embodiment is a method for transmitting a first synchronization signal and a second synchronization signal, a broadcast channel for transmitting initial access system information, a reference signal, a control channel for transmitting additional system information, and a data channel that does not overlap in time symbols. In this case, unlike other embodiments in which signals and channels are transmitted in a frequency division multiplexing (FDM) scheme, signals and channels are transmitted in a time division multiplexing (TDM) scheme. Reference Figure 14AIn 1400, a first synchronization signal, a second synchronization signal, and a broadcast signal for initial access are transmitted in a first bandwidth 1401, and an additional broadcast signal is transmitted in a second bandwidth 1403. Second bandwidth 1403 has the same center frequency as first bandwidth 1401, and the size of second bandwidth 1403 is larger than that of first bandwidth 1401. The BS transmits the first synchronization signal, the second synchronization signal, and the broadcast signal for initial access in first bandwidth 1401 using a second waveform, and transmits the additional broadcast signal in second bandwidth 1403.

[0149] Figure 14B Another channel multiplexing method according to the thirteenth embodiment of the present disclosure is shown. In another method, as shown in b 1410, a first synchronization signal and a second synchronization signal can be transmitted in a first bandwidth 1405, and a broadcast signal for initial access and a broadcast signal for additional system information can be transmitted in a second bandwidth 1407. The second bandwidth 1407 has the same center frequency as the first bandwidth 1405, and the size of the second bandwidth 1407 is larger than the size of the first bandwidth 1405. In addition, a DMRS can be transmitted between the first synchronization signal and the second synchronization signal. The first synchronization signal and the second synchronization signal can be transmitted using the first waveform form or the second waveform, and the remaining channels and signals can be transmitted using the second waveform.

[0150] Figure 14C Another channel multiplexing method according to the twelfth embodiment proposed in the present disclosure is shown. Referring to c 1420, the first synchronization signal and the second synchronization signal are sent equally to b 1410. The broadcast signal for sending additional system information is sent in the second bandwidth 1413. The broadcast signal for initial access can be sent while occupying the same bandwidth as the following bandwidth (second bandwidth 1413), wherein the bandwidth (second bandwidth 1413) is used to send the broadcast signal of additional system information in the resource occupying the same bandwidth as the first synchronization between the first synchronization signal and the second synchronization signal (the second symbol in the SSB) and in the symbol after the second synchronization signal (the fourth symbol in the SSB), and DMRS can be additionally sent in the second symbol in which the broadcast signal between the first synchronization signal and the second synchronization signal is sent. In this case, DMRS can occupy the third bandwidth 1411, the broadcast signal can occupy the first bandwidth 1409, and the DMRS and the broadcast signal can occupy non-overlapping subcarrier resources in the time samples in each bandwidth. For example, different comb offsets can be applied to the DMRS and the broadcast signal.

[0151] Figure 15 An example of an operation for multiplexing an initial access channel in a millimeter frequency band of a BS according to some embodiments of the present disclosure is shown. Figure 15 In step 1500, the BS determines whether the available bandwidth and the used bandwidth of the cell correspond to the FR4 frequency band. If the bandwidth corresponds to the FR4 frequency band, the BS transmits a first synchronization signal (PSS) and a second synchronization signal (SSS) in the first bandwidth using a second waveform in step 1510. Thereafter, in step 1520, the BS generates system information for a BS supporting the FR4 frequency band. In step 1530, the generated system information is transmitted in the second bandwidth using the second waveform via a broadcast signal.

[0152] Figure 16 FIG. 2 shows an example of an operation of multiplexing an initial access channel in a millimeter frequency band of a BS according to another embodiment of the present disclosure. Figure 16 In step 1600, the BS determines whether the available bandwidth and used bandwidth of the cell correspond to the FR4 frequency band. If the bandwidth corresponds to the FR4 frequency band, in step 1610, the BS transmits a first synchronization signal (PSS) in the first bandwidth using a first waveform. In step 1620, the BS transmits a second synchronization signal (SSS) in the first bandwidth using a second waveform. Thereafter, in step 1630, the BS generates system information for a BS supporting the FR4 frequency band. In step 1640, the generated system information is transmitted in the second bandwidth using the second waveform via a broadcast signal.

[0153] Figure 17 FIG. 2 shows an example of an operation of multiplexing an initial access channel in a millimeter frequency band of a BS according to another embodiment of the present disclosure. Figure 17 The BS determines whether the available bandwidth and the used bandwidth of the cell correspond to the FR4 frequency band in step 1700, and when the bandwidth corresponds to the FR4 frequency band, transmits a first synchronization signal (PSS) and a second synchronization signal (SSS) in the first bandwidth using a first waveform in step 1710. In step 1720, the BS generates system information for a BS supporting the FR4 frequency band, and in step 1730, transmits the generated system information in the first bandwidth or the second bandwidth using a second waveform through a broadcast signal.

[0154] Figure 18An example of an operation for multiplexing an initial access channel in a millimeter frequency band of a BS according to another embodiment of the present disclosure is shown. In step 1800, the BS determines whether the available frequency band and the used frequency band of the cell correspond to the frequency band of FR4. When the bandwidth corresponds to the frequency band of FR4, the BS transmits a first synchronization signal (PSS) and a second synchronization signal (SSS) in a first bandwidth using a first waveform in step 1810, and transmits a third synchronization signal (sPSS) and a fourth synchronization signal (sSSS) using a second waveform in step 1820. Thereafter, in step 1830, the BS generates system information for a BS supporting the frequency band of FR4, and in step 1840, transmits the generated system information in the first bandwidth or the second bandwidth using a second waveform through a broadcast signal.

[0155] Figure 19 FIG2 shows an example of an operation of a UE receiving an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure. Figure 19 In step 1900, the UE determines whether the available bandwidth and used bandwidth of the cell correspond to an FR4 frequency band. If the bandwidth corresponds to an FR4 frequency band, in step 1910, based on the length of the first synchronization signal (or when the second waveform is used to transmit the synchronization signal, the size of the second waveform bandwidth of the first bandwidth or the size of the first single carrier bandwidth (SC window)) and / or the time symbol allocation information of the synchronization signal, the UE receives and reconstructs the first synchronization signal (PSS) and the second synchronization signal (SSS) in the first bandwidth using a predetermined first waveform. In step 1920, based on the size of the second waveform bandwidth of the second bandwidth of the broadcast signal or the size of the second single carrier bandwidth (SC window) and / or the time symbol allocation information of the broadcast signal, the UE receives and reconstructs the broadcast signal in the second bandwidth using a predetermined second waveform. Thereafter, in step 1930, the UE obtains channel bandwidth (BW) information using the codepoints of the system information reconstructed in the broadcast signal. In step 1940, the UE obtains the size of the third SC bandwidth and / or third resource allocation information of the UE for receiving additional system information or data channels based on the system information reconstructed in the broadcast signal (which may be frequency and / or time resource allocation information of at least one of the PDCCH and PDSCH for receiving additional system information or data), receives the PDCCH and PDSCH, and obtains the system information or data.

[0156] Figure 20 FIG2 shows an example of an operation of a UE receiving an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure. Figure 20In step 2000, the UE determines whether the available bandwidth and used bandwidth of the cell correspond to an FR4 frequency band. If the bandwidth corresponds to an FR4 frequency band, in step 2010, the UE receives and reconstructs a first synchronization signal (PSS) in a first bandwidth using a first waveform based on time symbol allocation information. Furthermore, in step 2020, the UE receives and reconstructs a second synchronization signal (SSS) in the first bandwidth using a predetermined second waveform based on the length of the second synchronization signal (the size of the second waveform bandwidth of the first bandwidth or the size of the first single carrier bandwidth (SC window)) or / and the time symbol allocation information. In step 2030, the UE receives and reconstructs a broadcast signal in a second bandwidth using a predetermined second waveform based on the size of the single carrier bandwidth (SC window) of the broadcast signal and / or the time symbol allocation information. Thereafter, in step 2040, the UE obtains channel bandwidth (BW) information using the codepoints of the system information reconstructed in the broadcast signal. In addition, the UE obtains the size of the third single carrier bandwidth or / and third resource allocation information for receiving additional system information or data channels based on the system information reconstructed in the broadcast signal (which may be frequency and / or time resource allocation information of at least one of the PDCCH and PDSCH for receiving additional system information or data), receives the PDCCH and PDSCH, and obtains the system information or data channel.

[0157] Figure 21 FIG2 shows an example of an operation of a UE receiving an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure. Figure 21In step 2100, the UE determines whether the available bandwidth and used bandwidth of the cell correspond to an FR4 frequency band. If the bandwidth corresponds to an FR4 frequency band, in step 2110, based on the time symbol allocation information, the UE receives and reconstructs a first synchronization signal (PSS) and a second synchronization signal (SSS) in a first bandwidth using a predetermined first waveform. Step 2110 may be omitted. In step 2120, based on the length of the first synchronization signal (which may be the size of the first single carrier bandwidth or the size of the second waveform bandwidth according to the first bandwidth) and the time symbol allocation information, the UE receives and reconstructs the first synchronization signal (PSS) and the second synchronization signal (SSS) in the first bandwidth using a predetermined second waveform. In step 2130, based on the size of the single carrier bandwidth of the broadcast signal (which may be the size of the second waveform bandwidth according to the second bandwidth or the second single carrier bandwidth) and / or the time symbol allocation information, the UE receives and reconstructs the broadcast signal in the second bandwidth using a predetermined second waveform. Thereafter, in step 2140, the UE uses the codepoints of the system information reconstructed in the broadcast signal to obtain channel bandwidth (BW) information. In addition, in step 2150, the UE obtains the size of the third single carrier bandwidth or / and third resource allocation information (which may be frequency and / or time resource allocation information of at least one of the PDCCH and PDSCH for receiving additional system information or data) for receiving additional system information or data channels based on the system information reconstructed in the broadcast signal, receives the PDCCH and PDSCH, and obtains the system information or data channel.

[0158] Figure 22 FIG2 shows an example of an operation of a UE receiving an initial access channel in a millimeter frequency band of a BS according to an embodiment of the present disclosure. Figure 22In step 2200, the UE determines whether the available bandwidth and used bandwidth of the cell correspond to an FR4 frequency band. If the bandwidth corresponds to an FR4 frequency band, the UE identifies an available subcarrier spacing (SCS) in the corresponding frequency band in step 2210. Thereafter, in step 2220, the UE obtains the size of a first bandwidth (which may be the same as the first single carrier bandwidth) and the size of a second bandwidth (which may be the same as the second single carrier bandwidth) applicable to a first waveform of the subcarrier spacing. Thereafter, in step 2230, the UE receives and reconstructs a first synchronization signal (PSS) and a second synchronization signal (SSS) in the first bandwidth using a predetermined first waveform based on first time symbol allocation information (which may be information regarding the PSS and SSS). In step 2240, the UE receives and reconstructs a broadcast signal in the second bandwidth using a predetermined second waveform based on the size of the single carrier bandwidth of the broadcast signal (corresponding to the size of the second single carrier bandwidth) and / or second time symbol allocation information (which may be information regarding the DMRS and the broadcast signal). Thereafter, in step 2250, the UE obtains channel bandwidth (BW) information using the codepoints of the system information reconstructed in the broadcast signal. In addition, in step 2240, the UE obtains the size of the third single carrier bandwidth or / and third resource allocation information (which may be frequency and / or time resource allocation information of at least one of the PDCCH and PDSCH for receiving additional system information or data) for receiving additional system information or data channels based on the system information reconstructed in the broadcast signal, receives the PDCCH and PDSCH, and obtains the system information or data channel.

[0159] When the UE fails to reconstruct the broadcast signal or fails to acquire the system information in step 2240, the UE attempts to reconstruct the synchronization signal and the broadcast signal in the corresponding frequency band using another available SCS size, another first single carrier bandwidth, or a second single carrier bandwidth.

[0160] It is not necessary to perform all the steps of the above-described methods, some steps of multiple methods may be combined and performed, and the order of the steps may be changed.

[0161] Figure 23A BS device capable of operating an embodiment of the present disclosure is shown. BS device 2300 may include a signal generator / reconstructor 2301, a memory, and a controller 2305, and a transceiver 2303 may transmit and receive signals to and from a UE. The signals may include control information, reference signals, and data. To this end, transceiver 2303 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying and down-converting the frequency of the received signal. Signal generator / reconstructor 2301 may reconstruct a signal or encode data symbols from the baseband signal received by transceiver 2303, output the baseband signal to controller 2305, and transmit the signal output from controller 2305 via a radio channel. The signal generation unit may selectively configure the baseband signal of the first waveform and the second waveform in frequency or time, and transmit the baseband signal to the transceiver. Controller 2305 may control a series of processes to enable the BS to operate according to the embodiments of the present disclosure.

[0162] Figure 24 A UE device capable of implementing embodiments of the present disclosure is shown. UE device 2400 may include a transceiver 2403, a memory / controller 2405, and a signal generator / reconstructor 2401. Transceiver 2403 may transmit and receive signals to and from a base station (BS). The signals may include control information, reference signals, and data. To this end, transceiver 2403 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying and down-converting the frequency of the received signal. Signal generator / reconstructor 2401 may reconstruct the baseband signal transmitted from transceiver 2403 into predetermined information or data based on a first waveform or a second waveform using control channel information, or attempt reconstruction based on both the first waveform and the second waveform. If reconstruction is successful, the waveform information of the signal is identified as an assumed waveform. Furthermore, the transceiver may receive a signal via a wireless channel, output the signal to controller 2405, and transmit the signal output from controller 2405 via the wireless channel. Controller 2405 may control a series of processes to enable the UE to operate according to the above-described embodiments.

[0163] Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method performed by a base station (BS) in a wireless communication system, the method comprising: identifying whether a bandwidth of a cell controlled by the BS corresponds to a first frequency band; as well as In case the bandwidth of the cell corresponds to the first frequency band, sending a synchronization signal block (SSB), The SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH) for sending system information for initial access. wherein the PSS and SSS are transmitted using a first waveform and a second waveform in a first bandwidth, wherein, in a case where the first frequency band is included in frequency range 4, the PBCH is transmitted using the second waveform in the second bandwidth, and in a case where the first frequency band is included in frequency range 1, 2, or 3 having a lower starting frequency than frequency range 4, the PBCH is transmitted using the first waveform in the second bandwidth, and The first waveform corresponds to cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and the second waveform is a single carrier waveform.

2. The method according to claim 1, wherein The second bandwidth is equal to or wider than the first bandwidth.

3. The method according to claim 1, wherein The center frequency of the first bandwidth and the center frequency of the second bandwidth are the same, or The lowest frequency of the first bandwidth is the same as the lowest frequency of the second bandwidth.

4. The method according to claim 1, further comprising: Downlink Control Information (DCI) for scheduling additional system information is transmitted through the Physical Downlink Control Channel (PDCCH); as well as Additional system information scheduled by DCI is sent via the Physical Downlink Shared Channel (PDSCH). Among them, SSB, PDCCH and PDSCH are time division multiplexed (TDM).

5. The method according to claim 4, wherein transmitting the PDCCH and the PDSCH using a second waveform in a third bandwidth, The third bandwidth is wider than the second bandwidth.

6. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: identifying whether a bandwidth of a cell transmitting a synchronization signal block (SSB) that the UE desires to receive corresponds to a first frequency band; receiving the SSB when the bandwidth of the cell corresponds to the first frequency band; as well as Acquire synchronization and obtain system information for initial access based on the received SSB, The SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH) for receiving system information for initial access. wherein the PSS and SSS are received using the first waveform or the second waveform in the first bandwidth, wherein, in a case where the first frequency band is included in frequency range 4, the PBCH is received using the second waveform in the second bandwidth, and in a case where the first frequency band is included in frequency range 1, 2, or 3 having a lower starting frequency than frequency range 4, the PBCH is received using the first waveform in the second bandwidth, and The first waveform corresponds to cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and the second waveform is a single carrier waveform.

7. The method according to claim 6, wherein: The second bandwidth is equal to or wider than the first bandwidth.

8. The method according to claim 6, wherein: The center frequency of the first bandwidth and the center frequency of the second bandwidth are the same, or The lowest frequency of the first bandwidth is the same as the lowest frequency of the second bandwidth.

9. The method according to claim 6, further comprising: receiving downlink control information (DCI) for scheduling additional system information on a physical downlink control channel (PDCCH); as well as Receive additional system information scheduled by DCI on the Physical Downlink Shared Channel (PDSCH), Among them, SSB, PDCCH and PDSCH are time division multiplexed (TDM).

10. The method according to claim 9, wherein: receiving the PDCCH and the PDSCH using a second waveform in a third bandwidth, The third bandwidth is wider than the second bandwidth.

11. A base station (BS) in a wireless communication system, the BS comprising: transceiver; as well as a controller coupled to the transceiver and configured to: identifying whether a bandwidth of a cell controlled by the BS corresponds to a first frequency band and, In case the bandwidth of the cell corresponds to the first frequency band, sending a synchronization signal block (SSB), The SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH) for sending system information for initial access. wherein the PSS and SSS are sent using the first waveform or the second waveform in the first bandwidth, wherein, in a case where the first frequency band is included in frequency range 4, the PBCH is transmitted using the second waveform in the second bandwidth, and in a case where the first frequency band is included in frequency range 1, 2, or 3 having a lower starting frequency than frequency range 4, the PBCH is transmitted using the first waveform in the second bandwidth, and The first waveform corresponds to cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and the second waveform is a single carrier waveform.

12. The BS according to claim 11, wherein: The second bandwidth is equal to or wider than the first bandwidth.

13. The BS according to claim 11, wherein: The center frequency of the first bandwidth and the center frequency of the second bandwidth are the same, or The lowest frequency of the first bandwidth is the same as the lowest frequency of the second bandwidth.

14. The BS according to claim 11, wherein: The controller is also configured to: Transmitting downlink control information (DCI) for scheduling additional system information through a physical downlink control channel (PDCCH); and The additional system information scheduled by DCI is sent through the Physical Downlink Shared Channel (PDSCH). Among them, SSB, PDCCH and PDSCH are time division multiplexed (TDM).

15. The BS according to claim 14, wherein: transmitting the PDCCH and the PDSCH using a second waveform in a third bandwidth, The third bandwidth is wider than the second bandwidth.

16. A user equipment (UE) in a wireless communication system, the UE comprising: transceiver; as well as a controller coupled to the transceiver and configured to: performing control to identify whether a bandwidth of a cell transmitting a synchronization signal block (SSB) that the UE desires to receive corresponds to a first frequency band, receiving an SSB in case the bandwidth of the cell corresponds to a first frequency band, and Acquire synchronization and obtain system information for initial access based on the received SSB, The SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH) for sending system information for initial access. wherein the PSS and SSS are received using the first waveform or the second waveform in the first bandwidth, wherein, in a case where the first frequency band is included in frequency range 4, the PBCH is received using the second waveform in the second bandwidth, and in a case where the first frequency band is included in frequency range 1, 2, or 3 having a lower starting frequency than frequency range 4, the PBCH is received using the first waveform in the second bandwidth, and The first waveform corresponds to cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and the second waveform is a single carrier waveform.

17. The UE according to claim 16, wherein: The second bandwidth is equal to or wider than the first bandwidth.

18. The UE according to claim 16, wherein: The center frequency of the first bandwidth and the center frequency of the second bandwidth are the same, or The lowest frequency of the first bandwidth is the same as the lowest frequency of the second bandwidth.

19. The UE according to claim 16, wherein: The controller is also configured to: receiving downlink control information (DCI) for scheduling additional system information on a physical downlink control channel (PDCCH); and Receive additional system information scheduled by DCI on the Physical Downlink Shared Channel (PDSCH), Among them, SSB, PDCCH and PDSCH are time division multiplexed (TDM).

20. The UE according to claim 19, wherein: receiving the PDCCH and the PDSCH using a second waveform in a third bandwidth, The third bandwidth is wider than the second bandwidth.

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