Method and apparatus for transmitting and receiving data channels in a wireless communication system

Abstract

The present invention relates to: a communication technology and a system thereof for integrating a 5G communication system supporting a data transmission rate higher than that of a 4G system with IoT technology. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or Internet of Vehicles, healthcare, digital education, retail business, security and safety-related services, etc.). The present disclosure relates to a method for sending and receiving a data channel.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for sending and receiving a data channel in a cellular wireless communication system. Specifically, the present disclosure relates to a method and apparatus for sending and receiving a data channel for transmitting a system information block from a base station to a terminal. Background Art

[0002] In order to meet the demand for increased wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or Pre-5G communication systems. Therefore, 5G or Pre-5G communication systems are also called "beyond 4G network" communication systems or "post-LTE" systems.

[0003] 5G communication systems are considered to be implemented in higher frequency (millimeter wave) 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 in 5G communication systems are discussed.

[0004] In addition, in the 5G communication system, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), and receiving-end interference elimination.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have also been developed.

[0006] The Internet is a human-centered connected network where humans generate and consume information, and is now developing into the Internet of Things (IoT) where distributed entities such as things exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers. Since IoT implementation requires technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology", sensor networks, machine-to-machine (M2M) communication, machine-type communication (MTC), etc. have been studied. This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated in networked things. Through the integration and combination between existing information technology (IT) and various industrial applications, IoT can be applied to various fields including smart homes, smart buildings, smart cities, smart cars or vehicle networks, smart grids, healthcare, smart devices and advanced medical services.

[0007] 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 cloud radio access network (RAN) application as the above-mentioned big data processing technology can also be considered as an example of the fusion of 5G technology and IoT technology.

[0008] In recent years, with the requirements of the next generation communication system, various studies have been conducted on coverage enhancement. In particular, the demand for coverage enhancement of data channels is increasing. Summary of the invention

[0009] Technical issues

[0010] Technical aspects of the present disclosure provide a method and apparatus for transmitting and receiving a data channel in a mobile communication system, the data channel being used to transmit valid system information blocks for various services.

[0011] The technical subject matter pursued in the present disclosure may not be limited to the above contents, and those skilled in the art to which the present disclosure belongs may consider other technical subject matters not mentioned according to the following description of the embodiments of the present disclosure.

[0012] Problem Solution

[0013] In order to implement the above-mentioned technical aspects, a method of a terminal includes: receiving a synchronization signal block (SSB) from a base station; receiving downlink control information of a physical downlink shared channel (PDSCH) for scheduling a system information block (SIB) in which the system information block (SIB) is transmitted; based on a master information block (MIB) included in the SSB, identifying a transmission period and number of transmissions of the SIB; and receiving the SIB from the base station based on the scheduled PDSCH, transmission period and number of transmissions.

[0014] In order to achieve the above technical aspects, a method of a base station includes: sending a synchronization signal block (SSB) to a terminal; sending downlink control information of a physical downlink shared channel (PDSCH) for scheduling the transmission of a system information block (SIB); based on a master information block (MIB) included in the SSB, identifying a transmission period and number of transmissions of the SIB; and sending the SIB to the terminal based on the scheduled PDSCH, transmission period and number of transmissions.

[0015] In order to achieve the above-mentioned technical aspects, a terminal includes: a transceiver configured to send and receive signals; and a controller, configured to receive downlink control information of a physical downlink shared channel (PDSCH) for scheduling a system information block (SIB) in which a system information block (SIB) is transmitted, identify a transmission period and a number of transmissions of the SIB based on a master information block (MIB) included in the SSB, and receive the SIB from a base station based on the scheduled PDSCH, transmission period and number of transmissions.

[0016] In order to implement the above-mentioned technical aspects, the base station includes: a transceiver configured to send and receive signals; and a controller, configured to send a synchronization signal block (SSB) to a terminal, send downlink control information of a physical downlink shared channel (PDSCH) for scheduling a system information block (SIB) in which the system information block (SIB) is transmitted, identify the transmission period and number of transmissions of the SIB based on a master information block (MIB) included in the SSB, and send the SIB to the terminal based on the scheduled PDSCH, transmission period and number of transmissions.

[0017] Advantageous Effects of the Invention

[0018] According to various embodiments of the present disclosure, a method and apparatus for transmitting and receiving a data channel transmitting a valid system information block in a mobile communication system are provided, thereby enabling a system and a node that want to transmit a downlink signal to effectively manage the transmission of a data channel including a system information block. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The basic structure of the time-frequency domain of the radio resource area in the 5G system related to the embodiments of the present disclosure is shown;

[0020] Figure 2The time slot structure considered in the 5G communication system related to the embodiments of the present disclosure is shown;

[0021] Figure 3 A synchronization signal block (SSB) considered in a 5G communication system related to an embodiment of the present disclosure is shown;

[0022] Figure 4 The invention shows transmission of synchronization signal blocks in a frequency band of 6 GHz or lower considered in a 5G communication system related to an embodiment of the present disclosure;

[0023] Figure 5 The invention shows transmission of synchronization signal blocks in a 6 GHz or higher frequency band considered in a 5G communication system related to an embodiment of the present disclosure;

[0024] Figure 6 An example of transmission of a synchronization signal block according to a subcarrier spacing within a 5 ms period related to an embodiment of the present disclosure is shown;

[0025] Figure 7 A process for sending and receiving system information about LTE services and LTE-MTC services related to an embodiment of the present disclosure is shown;

[0026] Figure 8 A process for sending and receiving system information about a 5G mobile communication service related to an embodiment of the present disclosure is shown;

[0027] Fig. 9 An embodiment of a method of using a physical broadcast channel (PBCH) payload to indicate whether a massive machine type communication (mMTC) system information block (SIB) exists, which is related to an embodiment of the present disclosure, is shown;

[0028] Fig.10 An embodiment in which a terminal obtains system information related to an embodiment of the present disclosure is shown;

[0029] Fig.11 An embodiment in which a terminal obtains system information related to an embodiment of the present disclosure is shown;

[0030] Fig.12 An embodiment in which a terminal obtains system information related to an embodiment of the present disclosure is shown;

[0031] Fig.13 An embodiment in which a terminal obtains system information related to an embodiment of the present disclosure is shown;

[0032] Fig.14 An embodiment in which a terminal obtains system information related to an embodiment of the present disclosure is shown;

[0033] Fig.15An embodiment in which a terminal obtains system information related to an embodiment of the present disclosure is shown;

[0034] Fig.16 An embodiment in which a terminal obtains system information related to an embodiment of the present disclosure is shown;

[0035] Fig.17 is a block diagram of a terminal according to an embodiment of the present disclosure; and

[0036] Fig.18 is a block diagram of a base station according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0038] 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. The purpose of such omission of unnecessary descriptions is to prevent the main idea of ​​the present disclosure from being obscured and to convey the main idea more clearly.

[0039] 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 have the same reference numerals.

[0040] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will be apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only for fully disclosing the present disclosure and informing 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. In addition, when describing the present disclosure, when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear, the detailed description of the known functions or configurations incorporated herein will be omitted. The terms to be described below are terms defined in consideration of the functions in the present disclosure, and may be different according to the user, the user's intention or custom. Therefore, the definition of the terms should be based on the content of the entire specification.

[0041] Here, it can be understood that each block of the flowchart and the combination of blocks in the flowchart 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 device for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-available or computer-readable memory that can instruct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-available or computer-readable memory produce a product including an instruction device that implements the specified functions in one or more flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on the computer or other programmable device, thereby generating a computer-implemented process so that the instructions executed on the computer or other programmable device provide steps for implementing the specified functions in one or more flowchart blocks.

[0042] In addition, each block of the flow chart can represent a module, segment or portion of code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions recorded in the blocks may not occur in order. For example, two blocks shown in succession can actually be executed substantially simultaneously, or the blocks can sometimes be executed in reverse order, depending on the functions involved.

[0043] As used herein, "unit" refers to a software element or hardware element of a predetermined function such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have a meaning limited to software or hardware, and "unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, a segment, driver, firmware, microcode, circuit, data, database, data structure, table, array and parameter of a software element, object-oriented software element, class element or task element, process, function, attribute, procedure, subroutine, program code. The element and function 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" or can be implemented as one or more CPUs in a copy device or a secure multimedia card. In addition, "unit" in an embodiment can include one or more processors.

[0044] In the following description, a base station is an entity that allocates resources to a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.

[0045] In the present disclosure, "downlink (DL)" refers to a radio link via which a base station sends a signal to a terminal, and "uplink (UL)" refers to a radio link via which a terminal sends a signal to a base station. In addition, although the following description may be directed to an LTE or LTE-A system by way of example, the embodiments of the present disclosure may also be applied to other communication systems having a technical background or channel type similar to the embodiments of the present disclosure. Examples of other communication systems may include fifth-generation mobile communication technologies (5G, new radio, NR) developed outside of LTE-A, and in the following description, "5G" may be a concept covering existing LTE, LTE-A, and other similar services. In addition, based on the determination of those skilled in the art, the present disclosure may be applied to other communication systems by some modifications without significantly departing from the scope of the present disclosure.

[0046] Wireless communication systems have evolved from initially providing voice-oriented services to broadband wireless communication systems for providing high-speed and high-quality packet data services according to communication standards such as 3GPP's High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE Advanced (LTE-A) or LTE-Pro, 3GPP2 High Rate Packet Data (HRPD) or Ultra Mobile Broadband (UMB), and IEEE 802.16e.

[0047] As a representative example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme for the downlink (DL) and a single carrier frequency division multiple access (SC-FDMA) scheme for the uplink (UL). The uplink refers to a wireless link for a terminal to send data or a control signal to a base station, and the downlink refers to a wireless link for a base station to send data or a control signal to a terminal. These multiple access schemes can generally allocate and manage non-overlapping time-frequency resources for carrying each user's data or control information, i.e., they are orthogonal to each other, thereby distinguishing the data or control information for each user.

[0048] As a post-LTE communication system, the 5G communication system needs to simultaneously support services that meet various needs to freely reflect various needs from users and service providers. Services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable and low latency communication (URLLC), etc.

[0049] eMBB aims to provide further enhanced data rates than those supported by existing LTE, LTE-A or LTE-Pro systems. For example, in a 5G communication system, for one base station, eMBB needs to be able to provide a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink. In addition, the 5G communication system needs to provide not only peak data rates but also increased user-perceived data rates. In order to meet these requirements, various improved transmission and reception technologies including enhanced multiple-input multiple-output (MIMO) transmission technology may be required. In addition, the LTE system uses a transmission bandwidth of up to 20 MHz in the 2-GHz band to send signals, however, the 5G communication system can use a frequency bandwidth wider than 20 MHz in a band ranging from 3 to 6 GHz or a band of 6 GHz or higher to meet the data rate required by the 5G communication system.

[0050] In the 5G communication system, mMTC is considered to support application services such as the Internet of Things (IoT). In order to effectively provide IoT, mMTC needs to support access to a large number of UEs in a cell, enhanced UE coverage, increased battery time, reduced UE costs, etc. IoT is connected to various sensors and various devices to provide communication functions, so it is necessary to be able to support a large number of UEs in a cell (for example, 1,000,000 UEs / km 2 ). An mMTC-enabled UE is likely to be located in a shadow area not covered by a cell, such as a basement of a building, due to the nature of the service, and therefore requires a wider coverage area than other services provided by the 5G communication system. An mMTC-enabled UE needs to be configured as a low-cost UE, and since it is difficult to frequently replace the battery of the UE, a very long battery life of 10 to 15 years is required.

[0051] Finally, URLLC is a mission-critical cellular-based wireless communication service. URLLC can be used for remote control of robots or machines, industrial automation, drones, remote health care, emergency alerts, etc. Therefore, URLLC needs to provide ultra-low latency and ultra-high reliability communications. For example, services supporting URLLC need to meet not only air interface latency of less than 0.5 milliseconds, but also 10 -5Or lower required packet error rate. Therefore, for services supporting URLLC, the 5G system needs to provide a transmission time interval (TTI) shorter than that of other services, and also needs to allocate wide resources in the frequency band to ensure the reliability of the communication link.

[0052] In one system, three services of a 5G communication system (hereinafter interchangeable with a 5G system), namely mMTC, URLLC, and eMBB, can be transmitted through multiplexing in one system. Here, different transmission and reception schemes and different transmission and reception parameters can be used for corresponding services to meet different requirements of corresponding services.

[0053] Hereinafter, the frame structure of the 5G communication system will be described in detail with reference to the accompanying drawings.

[0054] Figure 1 The basic structure of the time-frequency domain as the radio resource area in the 5G system is shown.

[0055] exist Figure 1 In the figure, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The basic unit of resources in the time-frequency domain is a resource element (RE) 101, and an RE can be defined by an orthogonal frequency division multiplexing (OFDM) symbol (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol) 102 on the time axis and a subcarrier 103 on the frequency axis. In the frequency domain, (For example, 12) consecutive REs may form a resource block (RB) 104. In the time domain, Consecutive OFDM symbols may form a time slot 110 .

[0056] Figure 2 The time slot structure considered in the 5G communication system is shown.

[0057] Figure 2 An example of the structure of a frame 200, a subframe 201, and a time slot 202 is shown. One frame 200 may be defined as 10 ms, and one subframe 201 may be defined as 1 ms. Therefore, one frame 200 may include a total of 10 subframes 201, and one time slot 202 and 203 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). ). One subframe 201 may include one time slot 202 or multiple time slots 203, and the number of time slots 202 and time slots 203 of each subframe 201 may vary according to the configured subcarrier spacing values ​​μ 204 and 205.

[0058] Figure 2The example of FIG. 2 shows the time slot structure in the case where μ=0 (204) and μ=1 (205) are set as the subcarrier spacing value. When μ=0 (204), 1 subframe 201 can include 1 time slot 202, and when μ=1 (205), 1 subframe 201 can include 2 time slots 203. That is, the number of time slots per subframe is The number of time slots per frame can vary depending on the configured subcarrier spacing value μ. can be changed accordingly. Set μ according to each subcarrier spacing and The definition of is shown in Table 1.

[0059] Table 1

[0060]

[0061] In the 5G wireless communication system, the base station can send a synchronization signal block (SSB, interchangeable with SS block, SS / PBCH block, etc.) for initial access, and the synchronization signal block may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). During the initial access process of the terminal to the system, the terminal first obtains synchronization in the time and frequency domains of the downlink through a cell search and obtains a cell ID from the synchronization signal. The synchronization signal includes PSS and SSS. In addition, the terminal receives a master information block (MIB) from the base station on the PBCH to obtain system information related to transmission and reception, such as system bandwidth or related control information, and basic parameter values.

[0062] The synchronization signal is a reference signal used for cell search and is transmitted for each frequency band by applying a subcarrier spacing suitable for the channel environment such as phase noise. A 5G base station can transmit multiple synchronization signal blocks according to the number of analog beams to be operated. PSS and SSS can be mapped and transmitted with 12 RBs, and PBCH can be mapped and transmitted with 24 RBs. Hereinafter, the structure of transmitting the synchronization signal and PBCH in the 5G communication system will be described.

[0063] Figure 3 The synchronization signal blocks considered in the 5G communication system are shown.

[0064] according to Figure 3, the synchronization signal block 300 includes PSS 301, SSS 303 and PBCH (broadcast channel) 302. As shown in the figure, the synchronization signal block 300 is mapped to 4 OFDM symbols on the time axis. PSS 301 and SSS 303 can be sent in 12 RBs 305 on the frequency axis and in the first and third OFDM symbols on the time axis, respectively. In the 5G system, a total of 1008 different cell IDs can be defined, and depending on the physical layer ID of the cell, PSS 301 can have three different values, and SSS 303 can have 336 different values. The terminal can obtain one of the 1008 cell IDs by detecting and combining PSS 301 and SSS 303, which can be expressed by Equation 1.

[0065] Equation 1

[0066]

[0067] In Equation 1, N (1) ID Can be estimated from SSS 303 and has a value ranging from 0 to 335. N (2) ID It can be estimated from PSS 301 and has a value ranging from 0 to 2. The terminal can (1) ID and N (2) ID To estimate the cell IDN cell ID .

[0068] The PBCH 302 may be transmitted in resources corresponding to 24 RBs 306 on the frequency axis and the second to fourth symbols of the SS block on the time axis, and including 6 RBs 307 and 308 on both sides of the resources in which the SSS 303 is transmitted except for 12 middle RBs. Various types of system information referred to as MIB may be transmitted in the PBCH 302, and the MIB specifically includes information shown in Table 2 below.

[0069] Table 2

[0070]

[0071] In addition to Table 2, the PBCH payload and PBCH demodulation reference signal (DMRS) include the following additional information.

[0072] —Synchronization signal block information: The frequency domain offset of the synchronization signal block is indicated by the 4-bit ssb-SubcarrierOffset in the MIB, and the index of the synchronization signal block including the PBCH can be indirectly obtained by decoding the PBCH DMRS and the PBCH. More specifically, in a frequency band of 6 GHz or lower, 3 bits obtained by decoding the PBCH DMRS indicate the index of the synchronization signal block, and in a frequency band of 6 GHz or higher, a total of 6 bits including 3 bits obtained by decoding the PBCH DMRS and 3 bits included in the PBCH payload and obtained by decoding the PBCH indicate the index of the synchronization signal block including the PBCH.

[0073] —Physical Downlink Control Channel (PDCCH) information: The subcarrier spacing of the common downlink control channel is indicated by the 1-bit subCarrierSpacingCommon in the MIB, and the time-frequency resource configuration information about the control resource set (CORESET) and search space (SS) is indicated by the 8-bit pdcch-ConfigSIB1.

[0074] - System Frame Number (SFN): The 6-bit systemFrameNumber in the MIB is used to indicate some SFNs, the 4 least significant bits (LSBs) of the SFN are included in the PBCH payload, and thus the terminal can indirectly obtain the SFN by decoding the PBCH.

[0075] —Timing information in a radio frame: Through the synchronization signal block and the 1-bit half-frame included in the PBCH payload and obtained through decoding of the PBCH, the terminal can indirectly identify whether the synchronization signal block is sent in the first half-frame or the second half-frame of the radio frame.

[0076] The transmission bandwidth (12 RBs 305) of the PSS 301 and the transmission bandwidth (24 RBs 306) of the SSS 303 and the PBCH 302 are different from each other. Therefore, in the first OFDM symbol in which the PSS 301 is transmitted within the transmission bandwidth of the PBCH 302, 6 RBs 307 and 308 exist on both sides except for the 12 RBs in which the PSS 301 is transmitted, and this area can be used to transmit different signals or can be idle.

[0077] The entire synchronization signal block can be sent using the same analog beam. That is, PSS 301, SSS 303, and PBCH 302 can all be sent through the same beam. Since the analog beam cannot be applied differently on the frequency axis, in a specific OFDM symbol to which a specific analog beam is applied, the same analog beam is applied to all frequency axis RBs. That is, the same analog beam can be used to send all 4 OFDM symbols in which PSS 301, SSS 303, and PBCH 302 are sent.

[0078] Figure 4 An example of transmission of a synchronization signal block in a frequency band of 6 GHz or lower considered in a 5G communication system is shown. In the 5G communication system, in a frequency band of 6 GHz or lower, a subcarrier spacing (SCS) 420 of 15 kHz and subcarrier spacings 430 and 440 of 30 kHz may be used for transmission of a synchronization signal block. There is a subcarrier spacing of 15 kHz for a synchronization signal block. Figure 4 401) and there is a subcarrier spacing of 30 kHz for the synchronization signal block. Figure 4 (b) and two transmission instances (instance #2 402 and instance #3 403) of FIG. 4(c).

[0079] In example #1 401 with a subcarrier spacing 420 of 15 kHz, up to two synchronization signal blocks may be transmitted within a time 404 of 1 ms (corresponding to a slot length when a slot includes 14 OFDM symbols). Figure 4 In the example of , synchronization signal block #0 407 and synchronization signal block #1 408 are shown. Here, synchronization signal block #0 407 can be mapped to 4 consecutive symbols of the third OFDM symbol of the slave time slot, and synchronization signal block #1 408 can be mapped to 4 consecutive symbols of the ninth OFDM symbol of the slave time slot.

[0080] Different analog beams may be applied to the synchronization signal block #0 407 and the synchronization signal block #1 408. Therefore, the same beam may be applied to all the third to sixth OFDM symbols mapped to the synchronization signal block #0 407, and the same beam may be applied to all the ninth to twelfth OFDM symbols mapped to the synchronization signal block #1 408. The base station may freely determine which beam is used for the seventh, eighth, thirteenth, and fourteenth OFDM symbols to which the synchronization signal block is not mapped.

[0081] In instance #2 402 with a subcarrier spacing 430 of 30 kHz, up to two synchronization signal blocks can be sent in a time 405 of 0.5 ms (corresponding to the length of one slot when one slot includes 14 OFDM symbols), and thus up to 4 synchronization signal blocks can be sent in a time of 1 ms (corresponding to the length of 2 slots when one slot includes 14 OFDM symbols). Figure 4 The example shows that the synchronization signal block #0 409 and the synchronization signal block #1 410, the synchronization signal block #2 411 and the synchronization signal block #3 412 are sent within 1ms (i.e., two time slots). Here, the synchronization signal block #0 409 and the synchronization signal block #1 410 can be mapped from the fifth OFDM symbol and the ninth OFDM symbol of the first time slot, respectively, and the synchronization signal block #2 411 and the synchronization signal block #3 412 can be mapped from the third OFDM symbol and the seventh OFDM symbol of the second time slot, respectively.

[0082] Different analog beams may be applied to synchronization signal block #0 409, synchronization signal block #1 410, synchronization signal block #2 411, and synchronization signal block #3 412. Therefore, the same analog beam may be applied to the fifth to eighth OFDM symbols of the first slot in which synchronization signal block #0 409 is transmitted, the ninth to twelfth OFDM symbols of the first slot in which synchronization signal block #1 410 is transmitted, the third to sixth symbols of the second slot in which synchronization signal block #2 411 is transmitted, and the seventh to tenth symbols of the second slot in which synchronization signal block #3 412 is transmitted. The base station may freely determine which beam is used for the OFDM symbols to which the synchronization signal block is not mapped.

[0083] In instance #3 403 with a subcarrier spacing 440 of 30 kHz, up to 2 synchronization signal blocks can be sent in a time 406 of 0.5 ms (corresponding to the length of one slot when one slot includes 14 OFDM symbols), and thus up to 4 synchronization signal blocks can be sent in a time 406 of 1 ms (corresponding to the length of 2 slots when one slot includes 14 OFDM symbols). Figure 4 The example shows that synchronization signal block #0 413, synchronization signal block #1 414, synchronization signal block #2 415, and synchronization signal block #3 416 are sent within 1 ms (i.e., two time slots). Here, synchronization signal block #0 413 and synchronization signal block #1 414 can be mapped from the third OFDM symbol and the ninth OFDM symbol of the first time slot, respectively, and synchronization signal block #2 415 and synchronization signal block #3 416 can be mapped from the third OFDM symbol and the ninth OFDM symbol of the second time slot, respectively.

[0084] Different analog beams may be used for synchronization signal block #0 413, synchronization signal block #1 414, synchronization signal block #2 415, and synchronization signal block #3 416. As described above, the same analog beam may be used for the four OFDM symbols in which each synchronization signal block is transmitted, and the base station may freely determine which beam is used for the OFDM symbols to which the synchronization signal block is not mapped.

[0085] Figure 5 An example of transmission of a synchronization signal block in a 6 GHz or higher frequency band considered in a 5G communication system is shown. In a 5G communication system, in a 6 GHz or higher frequency band, a subcarrier spacing 530 of 120 kHz and a subcarrier spacing 540 of 240 kHz may be used for transmission of a synchronization signal block.

[0086] In such Figure 5 In example #4510 with a subcarrier spacing 530 of 120 kHz shown in (a), up to 4 synchronization signal blocks can be sent at a time 501 of 0.25 ms (corresponding to the length of two time slots when one time slot includes 14 OFDM symbols). Figure 5 The example of (a) shows that synchronization signal block #0 503, synchronization signal block #1 504, synchronization signal block #2 505, and synchronization signal block #3 506 are transmitted within 0.25 ms (i.e., two time slots). Here, synchronization signal block #0 503 and synchronization signal block #1 504 can be mapped from the fifth OFDM symbol and the ninth OFDM symbol of the first time slot, respectively, and synchronization signal block #2 505 and synchronization signal block #3 506 can be mapped from the third OFDM symbol and the seventh OFDM symbol of the second time slot, respectively.

[0087] As described above, different analog beams may be used for synchronization signal block #0 503, synchronization signal block #1 504, synchronization signal block #2 505, and synchronization signal block #3 506, respectively. The same analog beam may be used for the four OFDM symbols in which each synchronization signal block is transmitted, and the base station may freely determine which beam is used for the OFDM symbols to which the synchronization signal block is not mapped.

[0088] In such Figure 5 In example #5520 with a subcarrier spacing 540 of 240 kHz shown in (b), up to 8 synchronization signal blocks can be sent at a time 502 of 0.25 ms (corresponding to a length of 4 time slots when one time slot includes 14 OFDM symbols). Figure 5Example (b) shows that synchronization signal block #0 507, synchronization signal block #1 508, synchronization signal block #2 509, synchronization signal block #3 510, synchronization signal block #4 511, synchronization signal block #5 512, synchronization signal block #6 513 and synchronization signal block #7 514 are sent within 0.25 ms (i.e., 4 time slots). Here, synchronization signal block #0 507 and synchronization signal block #1 508 can be mapped from the ninth OFDM symbol and the thirteenth OFDM symbol of the first time slot, respectively, synchronization signal block #2 509 and synchronization signal block #3 510 can be mapped from the third OFDM symbol and the seventh OFDM symbol of the second time slot, respectively, synchronization signal block #4 511, synchronization signal block #5 512 and synchronization signal block #6 513 can be mapped from the fifth OFDM symbol, the ninth OFDM symbol and the thirteenth OFDM symbol of the third time slot, respectively, and synchronization signal block #7 514 can be mapped from the third OFDM symbol of the fourth time slot.

[0089] As described above, different analog beams may be used for synchronization signal block #0 507, synchronization signal block #1 508, synchronization signal block #2 509, synchronization signal block #3 510, synchronization signal block #4 511, synchronization signal block #5 512, synchronization signal block #6 513, and synchronization signal block #7 514. The same analog beam may be used for the four OFDM symbols in which each synchronization signal block is transmitted, and the base station may freely determine which beam is used for the OFDM symbols to which the synchronization signal blocks are not mapped.

[0090] Figure 6 An example of transmission of a synchronization signal block according to a subcarrier spacing within a time of 5 ms is shown. In a 5G communication system, a synchronization signal block 610 is periodically transmitted every 5 ms (corresponding to 5 subframes or half frames).

[0091] In a frequency band of 3 GHz or lower, up to 4 synchronization signal blocks may be transmitted within a 5 ms time 610. In a frequency band ranging from 3 GHz to 6 GHz, up to 8 synchronization signal blocks may be transmitted within a 5 ms time 610. In a frequency band of 6 GHz or higher, up to 64 synchronization signal blocks may be transmitted within a 5 ms time 610. As described above, a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz may be used at a frequency of 6 GHz or lower.

[0092] Figure 6 The example of (a) shows that the application is configured Figure 4 Example #1 of 401 of a time slot with a 15kHz subcarrier spacing. Figure 6(a), in a frequency band of 3 GHz or lower, the synchronization signal block can be mapped to the first time slot and the second time slot, and thus up to 4 synchronization signal blocks 621 can be sent, and in a frequency band range from 3 GHz to 6 GHz, the synchronization signal block can be mapped to the first, second, third and fourth time slots, and thus up to eight synchronization signal blocks 622 can be sent.

[0093] Figure 6 (b) and Figure 6 The example of (c) shows that the application is configured Figure 4 Implementation example #2 402 or example #3 403 of 2 time slots with a subcarrier spacing of 30 kHz. Figure 6 (b) and Figure 6 (c), in a frequency band of 3 GHz or lower, the synchronization signal block can be mapped from the first time slot and thus up to 4 synchronization signal blocks 631 and 641 can be sent, and in a frequency band range from 3 GHz to 6 GHz, the synchronization signal blocks can be mapped from the first and third time slots and thus up to 8 synchronization signal blocks 632 and 642 can be sent.

[0094] 120kHz subcarrier spacing and 240kHz subcarrier spacing can be used at 6GHz or higher frequencies. Figure 5 Example #4 of 2 slots with 120kHz subcarrier spacing 510 Figure 6 In the example of (d), in the 6 GHz or higher frequency band, the synchronization signal blocks can be mapped from the 1st, 3rd, 5th, 7th, 11th, 13th, 15th, 17th, 21st, 23rd, 25th, 27th, 31st, 33rd, 35th and 37th time slots. Therefore, up to 64 synchronization signal blocks 651 can be sent. Figure 5 Example of 4 time slots with 240kHz subcarrier spacing #5 520 Figure 6 In the example of (e), in a frequency band of 6 GHz or higher, the synchronization signal blocks can be mapped from the 1st, 5th, 9th, 13th, 21st, 25th, 29th and 33rd time slots, so that up to 64 synchronization signal blocks 661 can be sent.

[0095] In the LTE communication system, machine type communication (LTE-MTC) has been developed to support application services such as the Internet of Things (IoT). LTE-MTC is an IoT-only access technology with low-power design, low-cost equipment supply, low construction cost, stable coverage and large-scale terminal access as key requirements. Compared with LTE services, LTE-MTC can ensure long battery life of the terminal by reducing the transmission speed and transmission bandwidth, and uses a low-power design using a power saving mode. In addition, due to the significant reduction in transmission speed and transmission bandwidth, the complexity of the communication modem is significantly reduced, making it possible to achieve a low-cost terminal. In addition, single antenna technology can be applied instead of multi-antenna (MIMO) technology to minimize power consumption. In addition, the existing LTE network can be used as is, without additional investment, thereby supporting existing LTE services and LTE-MTC services.

[0096] Here, in order not to exert an impact on the terminal provided with the existing LTE service, additional information is included in the remaining bits of the MIB included in the PBCH for the existing LTE service, thereby indicating that the cell sending the PBCH also supports the LTE-MTC service, and also indirectly indicating the resource location of the system information block type 1-bandwidth reduction (SIB1-BR) for the LTE-MTC service. Therefore, a terminal or multiple nodes provided with the LTE-MTC service can determine whether the cell found by the cell search is a cell supporting the LTE-MTC service, and can obtain the location of the resources for receiving the corresponding system information block when the cell also supports the LTE-MTC service. In addition, the terminal provided with the existing LTE service can receive the LTE service without additional operations or new operations in addition to the existing operations.

[0097] Figure 7 The process for sending and receiving system information about LTE services and LTE-MTC services is shown. Figure 7 In LTE service, the base station periodically sends synchronization signals and PBCH to multiple terminals in the system, and the terminal obtains time and frequency synchronization through the synchronization signal and is provided with necessary system information MIB (701) through the PBCH. Operation 701 is performed by the LTE terminal and the LTE-MTC terminal. Subsequently, the LTE terminal receives various system information called system information blocks (SIBs) in a fixed resource area (or PDSCH transmission area) for receiving a downlink data channel (physical downlink shared channel: PDSCH) (702).

[0098] The LTE-MTC terminal obtains scheduling information (e.g., number of repetitions and transport block size (TBS)) corresponding to the additional LTE-MTC service included in the MIB. The LTE-MTC terminal can determine a resource location based on the scheduling information, and can receive a PDSCH in the resource location, thereby receiving various system information called a system information block corresponding to the LTE-MTC service (704).

[0099] In the 5G communication system, mMTC services are considered to support application services such as the Internet of Things (IoT). In the mMTC service, in order to effectively provide IoT, it is necessary to support large-scale terminal access within the cell, improve terminal coverage, improve battery life, and reduce terminal costs. In particular, in order to reduce the cost of terminals supporting mMTC services, it is mainly necessary to reduce the minimum transmission bandwidth required by the terminal. Here, in order to reduce additional investment, it is necessary to support existing 5G communication services and mMTC services in one 5G cell. That is, it is necessary to support terminals with existing transmission bandwidth and terminals with relatively small transmission bandwidth in one 5G cell, and it is necessary to provide 5G communication services to terminals with existing 5G communication services without the need for additional operations or new operations other than existing operations.

[0100] Figure 8 A process for transmitting and receiving system information about a 5G mobile communication service is shown. Figure 8, the base station periodically sends a synchronization signal block including a synchronization signal and a PBCH to multiple terminals in the system, and the terminal obtains time and frequency synchronization through the synchronization signal included in the synchronization signal block, and receives the MIB (801) as necessary system information through the PBCH. The terminal monitors or retrieves a common physical downlink control channel (common PDCCH) (802) in a common downlink control channel area (hereinafter referred to as CORESET or search space) based on the time domain and frequency domain information indicated by the MIB. When the terminal detects the common PDCCH, the terminal obtains downlink control information (DCI) (803) sent from the base station through the detected common PDCCH. The terminal can obtain scheduling information about a downlink data channel or an uplink data channel through the received DCI information. That is, the DCI may include information about a resource area (or PDSCH transmission area) for the terminal to receive the PDSCH sent from the base station, or information about a resource area for the terminal allocated by the base station to send a physical uplink shared channel (PUSCH). The DCI obtained in operation 803 includes information of a PDSCH transmission region in which the base station transmits the SIB, and the terminal obtains information about the PDSCH transmission region from the DCI (804). Various system information called a system information block (SIB) may be transmitted in the scheduled PDSCH, and the terminal obtains the SIB (805).

[0101] Fig. 9 The multiplexing pattern between the synchronization signal block and the CORESET is shown. Figure 8 The common downlink control channel region (CORESET) indicated by the MIB in the process 802 for sending and receiving the above system information described above can have three multiplexing modes according to the position relative to the synchronization signal block. Fig. 9 In the example of (a), in frequency range 1 (FR1), the SSB-CORESET multiplexing pattern is time division multiplexed (TDM) (910). The position of the CORESET based on the SSB has a pattern multiplexed in the time domain, and the CORESET resources are allocated in two consecutive time slots. Specifically, the offset 911 in RB units between the SSB and the CORESET in the frequency domain and the offset 912 in time slot units in the time domain and the starting symbol position of the CORESET are determined based on the values ​​included in the MIB. Here, the PDSCH scheduled by the downlink control information of the PDCCH detected in the CORESET exists in the time slot including the CORESET (913).

[0102] exist Fig. 9In the example of (b), in frequency range 2 (FR2), the SSB-CORESET multiplexing pattern is TDM and frequency division multiplexed (FDM) (920). The position of the CORESET based on the SSB has a pattern that is multiplexed in the time domain and the frequency domain, and the CORESET resources are allocated in one time slot. Specifically, the offset 921 in RB units between the SSB and the CORESET in the frequency domain and the number of time slots of the system frame and the CORESET in the time domain and the starting symbol position of the CORESET are determined based on the value included in the MIB (922). Here, the PDSCH scheduled by the downlink control information of the PDCCH detected in the CORESET exists in the time slot including the CORESET or in the next time slot (923).

[0103] exist Fig. 9 In the example of (c), in frequency range 2 (FR2), the SSB-CORESET multiplexing pattern is FDMed (930). The position of the CORESET based on the SSB has a pattern that is multiplexed in the frequency domain, and the CORESET resources are allocated in one time slot. Specifically, the offset 931 in units of RB between the SSB and the CORESET in the frequency domain and the number of time slots of the system frame and the CORESET in the time domain and the starting symbol position of the CORESET are determined based on the value included in the MIB (932). Here, the start symbol of the CORESET indicated in the time domain matches the start symbol of the SSB. In addition, the PDSCH scheduled by the downlink control information of the PDCCH detected in the CORESET exists in the time slot including the CORESET (933).

[0104] In 5G mobile communication services, as the center frequency generally increases, the coverage of base stations and terminals decreases, so coverage enhancement is a key requirement. In particular, in frequency range 2 (FR2), as the center frequency increases rapidly, the coverage of base stations and terminals decreases rapidly. In order to enhance the coverage of base stations and terminals, it is particularly important to enhance the coverage of system information blocks because data including necessary system information blocks need to be successfully received to connect base stations and terminals. In a representative method for coverage enhancement, the data including the system information block needs to have a small coding rate, or a power gain is obtained due to a small payload size or configuration as a wide time domain resource. However, the data used to send the system information block is basic data and therefore has a determined minimum payload size. Therefore, a basic method for coverage enhancement may be to configure a fixed payload size with a wide time domain resource. See above Fig. 9As described above, except for the SSB-CORESET multiplexing mode 2 920, the data including the system information block needs to be transmitted in the same time slot as, for example, the corresponding CORESET. In particular, in multiplexing mode 3 930, the SSB and the CORESET perform FDM, and the beam of the data including the system information block needs to be the same as the scheduled PDCCH, that is, it needs to be the same as the beam of the CORESET that detects the PDCCH, and also needs to be the same as the beam of the SSB connected to the CORESET. That is, the data including the system information block cannot overlap with the SSB on the time axis. Therefore, in FR2, due to the above constraints, the data including the system information block is inevitably transmitted within very limited time resources.

[0105] Therefore, the present disclosure provides a method for allocating transmission resources for data including system information blocks, thereby enhancing the coverage of base stations and terminals in 5G mobile communication services and various services. In addition, the present disclosure provides a method for repeatedly sending data including system information blocks.

[0106] Hereinafter, the present disclosure proposes a method and apparatus for sending and receiving downlink data including a system information block for coverage enhancement, but the main points of the present disclosure can be applied to general downlink data and uplink data, not limited to downlink data including system information blocks, and can be applied to a method and apparatus for transmitting data for services provided in a 5G system other than coverage enhancement (e.g., URLLC).

[0107] Example 1

[0108] Embodiment 1 of the present disclosure shows a method in which a base station allocates resources for a data channel through which a system information block is sent to a terminal. As described above, the method for allocating resources for a data channel through which a system information block is transmitted shown in this embodiment is a method for allocating time resources more dynamically and flexibly than existing methods to enhance coverage. Specifically, in the prior art, depending on the specified relationship between the synchronization signal block and the CORSET, the resources for sending the data channel through which the system information block is transmitted are limited. For example, in multiplexing mode 3 in the frequency range FR2, the time resources for sending the data channel through which the system information block is transmitted are at most two OFDM symbols (when all synchronization signal blocks are actually sent). Here, since the minimum data size of the system information block is determined and the system information block is very important information, it is necessary to increase the time resources as described above to enhance coverage. Therefore, the present disclosure proposes a method for dynamically and flexibly allocating resources to enhance the coverage of data in which the system information block is sent.

[0109] The following method may be considered as a method of allocating resources in order to enhance coverage of data in which a system information block is transmitted.

[0110] Example 1-1

[0111] The base station can flexibly allocate resources for the PDSCH including the system information block to the terminal. As described above, depending on the designated relationship between the synchronization signal block and the CORSET, the resources for sending the data channel through which the system information block is transmitted are limited. Specifically, the CORESET and the data channel through which the system information block is transmitted need to be allocated in the same time slot 933 as the CORESET or a time slot after the CORESET. In addition, there is a restriction that the CORESET and the data channel corresponding to the synchronization signal block need to be sent in resources overlapping with the synchronization signal block in the time domain. Therefore, in the frequency range FR2, the time resources for sending the data channel through which the system information block is transmitted are at most two OFDM symbols (when all synchronization signal blocks are actually sent). Therefore, in order to solve this problem, a method for flexibly configuring the offset between the CORESET and the data channel through which the system information block is transmitted through L1 signaling (e.g., downlink control information included in the corresponding CORESET), a mutually agreed offset, or MIB (Master Information Block) is proposed.

[0112] Fig.10 The method of configuring resources by offsetting between the CORESET and the data channel through which the system information block is transmitted according to the aforementioned embodiment is shown. When the offset between the CORESET and the PDSCH is dynamically configured when the SCS of the SSB and the CORESET is 120kHz in the frequency range FR2, it can be as follows Fig.10 In example #1 1010 of (a), resources of the PDSCH including SIB1 are configured. Fig.10 (a), when the CORESET 1011 corresponding to the first SSB configures the offset between the CORESET and the PDSCH to two time slots 1012, the offset can be applied so that 4 OFDM symbols are allocated to the resources of the PDSCH 1013 including SIB1. Compared with the above-mentioned 2 limited OFDM symbols, these 4 OFDM symbols are a sufficiently large number of radio resources.

[0113] like Fig.10 As shown in (b) of FIG. 1 , when the SCS of SSB and CORESET is 120 kHz in the frequency range FR2, the offset between CORESET and PDSCH is configured to a mutually agreed value (or preset value), as shown in FIG. Fig.10 In example #2 1020 of (b) , resources of the PDSCH including SIB1 are configured. Fig.10In (b), when the CORESET 1021 corresponding to the first SSB configures the offset between the CORESET and the PDSCH to be 40 time slots 1022, the offset can be applied so that 6 OFDM symbols are allocated for the resources of the PDSCH 1023 including SIB1. Unlike in Example #1 1010, since the offset between the CORESET and the PDSCH is mutually agreed, all offsets between the CORESET and the PDSCH are 40 time slots. These 6 OFDM symbols are compared to Fig.10 The radio resources in (a) described in the embodiment are multiple radio resources.

[0114] The method is not limited to a single method for sending and receiving a data channel through which a system information block is transmitted, but can be combined with a method of repeatedly sending a data channel through which a system information block is transmitted according to Embodiment 2 to be described below, thereby sending and receiving a data channel in which a system information block is transmitted.

[0115] Example 2

[0116] Embodiment 2 of the present disclosure shows a method in which a base station repeatedly sends a data channel in which a system information block is transmitted to a terminal. Specifically, depending on the specified relationship between the synchronization signal block and the CORSET, the resources used to send the data channel through which the system information block is transmitted are limited. As described above, the CORESET and the data channel through which the system information block is transmitted need to be allocated in the same time slot or the next time slot according to the multiplexing mode, and there is such a restriction that the CORESET and the data channel corresponding to the synchronization signal block need to be sent in the resources overlapping with the synchronization signal block in the time domain for beam matching. Therefore, in multiplexing mode 3 in the frequency range FR2, the time resources used to send the data channel through which the system information block is transmitted are at most 2 OFDM symbols (when all synchronization signal blocks are actually sent). Here, since the minimum data size of the system information block is determined and the system information block is very important information, it is necessary to increase the time resources as described above in order to enhance the coverage. Therefore, the present disclosure proposes a method for repeatedly sending system information blocks to enhance the coverage of data in which the system information blocks are transmitted.

[0117] The following embodiments may be considered as a method for repeated transmission in order to enhance the coverage of data in which the system information block is transmitted.

[0118] Example 2-1

[0119] The base station may repeatedly transmit a PDSCH corresponding to one synchronization signal block and transmitting a system information block. As described above, the resources for transmitting the data channel through which the system information block is transmitted are limited depending on the specified relationship between the synchronization signal block and the CORSET. Specifically, the CORESET and the data channel through which the system information block is transmitted need to be allocated in the same time slot or the next time slot, and there is such a restriction that the CORESET and the data channel corresponding to the synchronization signal block need to be transmitted in the resources overlapping with the synchronization signal block in the time domain for beam matching. Therefore, in the frequency range FR2, the time resource for transmitting the data channel through which the system information block is transmitted is at most 2 OFDM symbols (when all synchronization signal blocks are actually transmitted). Therefore, in order to solve this problem, the base station repeatedly transmits the PDSCH including the system information block, and the terminal receiving the repeatedly transmitted PDSCH can combine and decode or receive the received one or more PDSCHs. Therefore, the terminal can improve the performance of detecting the system information block. As described above, since the resource configuration of the PDSCH including the system information block is very limited, the base station can repeatedly configure the transmission resources for the PDSCH including the system information block by configuring one or more subsequent information segments.

[0120] — Information about the number of repetitions

[0121] - Information about the time resource offset between PDCCH and PDSCH (in time slots, symbols or frames)

[0122] —Information about the starting OFDM symbol position of the PDSCH resource and information about the OFDM symbol length

[0123] - Information about the frequency resources of PDSCH

[0124] The above information segment may be sent by the base station to the terminal through L1 signaling (downlink channel) or a master information block (MIB), or may be configured as a value agreed upon between the terminal and the base station or a preset value.

[0125] Here, the following embodiments may be considered as a method for a base station to repeatedly transmit a PDSCH corresponding to one synchronization signal block and transmitting a system information block.

[0126] Example 2-1-1

[0127] The PDSCH corresponding to one synchronization signal block and transmitting the system information block can be repeatedly transmitted in consecutive time slots. Specifically, when configuring the PDSCH resources, the base station can flexibly transmit the PDSCH transmitting the system information block repeatedly in consecutive time slots through information about the number of repetitions and information about the time resource offset (in time slots, symbols or frames) between the PDCCH and the PDSCH. The information about the number of repetitions and the information about the time resource offset between the PDCCH and the PDSCH can be configured as previously agreed values, or can be dynamically configured in the terminal through L1 signaling (e.g., DCI).

[0128] Fig.11 FIG. 1 shows an embodiment in which a base station repeatedly transmits a PDSCH through which a system information block is transmitted. When the SCS of the SSB and CORESET in the frequency range FR1 is 15 kHz, the positions of the SSB and CORESET may be as follows: Fig.11 Configuration shown. Fig.11 In the embodiment of , the base station may actually transmit only SSB#0 1101, SSB#4 1102, and SSB#5 1103, and the terminal may obtain information about the SSBs transmitted by the base station through the MIB. When the offset 1112 between the PDCCH and the PDSCH is configured as 4 slots through the CORESET 1111 configured in the SSB#0 1101 and the number of repetitions is configured as 4, the PDSCH 1113 including the SIB1 may be repeatedly transmitted in 4 consecutive slots from the slot determined by the offset 1112. Subsequently, when the offset 1122 between the PDCCH and the PDSCH is configured as zero slot through the CORESET 1121 configured in the SSB#4 1102 and the number of repetitions is configured as 4, the PDSCH 1123 including the SIB1 may be repeatedly transmitted in 4 consecutive slots from the slot determined by the offset 1122. In addition, when the offset 1132 between the PDCCH and the PDSCH is configured as zero slot by the CORESET 1131 configured in the SSB#5 1103 and the number of repetitions is configured as 4, the PDSCH 1133 including the SIB1 can be repeatedly transmitted in 4 consecutive slots from the slot determined by the offset 1132.

[0129] Example 2-1-2

[0130] The base station may repeatedly transmit a PDSCH corresponding to one synchronization signal block and transmitting a system information block according to a specific period. Specifically, when configuring PDSCH resources, the base station may periodically and repeatedly transmit a PDSCH through which a system information block is transmitted through information about the number of repetitions and repetition period information. The information about the number of repetitions and the repetition period information may be configured as previously agreed values, or may be dynamically configured in the terminal through L1 signaling (e.g., DCI).

[0131] Fig.12 An embodiment in which a PDSCH through which a system information block is transmitted is repeatedly transmitted is shown. Fig.12 (a) shows an example in which the SCS of the SSB and CORESET in the frequency range FR2 is 120 kHz and the repetition period is 40 time slots (or 5 ms), wherein the CORESET 1211 configured in the SSB #0 1201 in the example #1 1210 schedules the PDSCH 1221 including the SIB1, and the base station repeatedly transmits the PDSCH (1221, 1222, and 1223) according to the configured repetition period 1231 and the number of repetitions. The terminal can receive the system information block from at least one of the repeatedly transmitted PDSCH 1221, PDSCH 1222, and PDSCH 1223.

[0132] Fig.12 (b) shows an example in which the SCS of the SSB and CORESET in the frequency range FR2 is 120kHz and the repetition period is 160 time slots (or 20ms) 1280, wherein the CORESET 126 configured in the SSB #0 1251 in the example #2 1250 schedules the PDSCH 1271 including the SIB1, and the base station repeatedly transmits the PDSCH (1271, 1272, and 1273) according to the configured repetition period 1281 and the number of repetitions. Here, in the period in which the PDSCH including the SIB1 is repeatedly transmitted, the terminal does not need to detect the PDCCH in the SSB and the CORESET corresponding to the SSB. Therefore, according to this embodiment, the power for receiving and detecting the downlink signal can be reduced according to the implementation of the terminal. The terminal can receive the system information block from at least one of the repeatedly transmitted PDSCHs 1271, 1272, and 1273.

[0133] Example 2-2

[0134] The base station may repeatedly send PDSCHs corresponding to one or more synchronization signals and transmitting the same system information block, and the terminal may combine and decode or receive one or more PDSCHs through which the same system information block is transmitted. Specifically, the base station may send one or more PDSCHs corresponding to each synchronization signal block and including system information blocks on resources defined by the same subcarrier position and the same OFDM symbol position on multiple time slots, so that the terminal may combine and receive one or more PDSCHs corresponding to different synchronization signal blocks and including system information blocks, thereby improving the performance of detecting system information blocks. Here, as described above, since the resource configuration of the PDSCH including the system information block is very limited, the base station may flexibly configure the transmission resources of the PDSCH including the system information block through one or more of the following information segments.

[0135] — Information about the number of repetitions

[0136] - Information about the time resource offset between PDCCH and PDSCH (in time slots, symbols or frames)

[0137] —Information about the starting OFDM symbol position of the PDSCH resource and information about the OFDM symbol length

[0138] - Information about the frequency resources of PDSCH

[0139] The above information segment may be configured for the terminal by the base station through L1 signaling (downlink channel) or a master information block (MIB), or may be configured as a value (preset value) agreed upon between the terminal and the base station.

[0140] Here, the following method may be considered as a method for a base station to repeatedly transmit a PDSCH corresponding to one or more synchronization signal blocks and including a system information block.

[0141] Implementation Plan 2-2-1

[0142] The base station can configure each CORESET through the MIB of each synchronization signal block actually sent, and can send multiple PDSCHs scheduled by the downlink control information detected by each CORESET and corresponding to multiple synchronization signal blocks. Specifically, the terminal does not obtain the system information block by detecting only one synchronization signal block, but detects multiple synchronization signal blocks actually sent by the base station, and obtains each segment of the downlink control information on the PDCCH detected in the CORESET configured by the MIB of each synchronization signal block. The terminal can combine and decode or receive all PDSCHs in the multiple PDSCHs scheduled by the multiple segments of the obtained downlink control information, thereby obtaining one system information block.

[0143] In this embodiment, each of the multiple PDSCHs including the same system information block corresponds to each synchronization signal block actually sent by the base station. That is, the base station can send multiple PDSCHs including the same system information block through multiple beams.

[0144] Fig.13 The process of a terminal receiving multiple PDSCHs to obtain a system information block according to embodiment 2-2-1 is shown.

[0145] See also Fig.13 , the base station periodically sends a plurality of synchronization signal blocks including synchronization signals and PBCH to the terminal in the system, and the terminal detects the synchronization signal blocks actually sent by the base station (1301). Through a plurality of PBCHs respectively included in a plurality of detected synchronization signal blocks, the terminal is provided with necessary system information MIB (1302). The terminal monitors or retrieves a common downlink control channel (common PDCCH) (1303) in a common downlink control channel area (hereinafter referred to as CORESET or search space) based on the time domain and frequency domain information indicated by the MIB. When the terminal detects the common PDCCH, the terminal obtains the downlink control information (DCI) (1304) sent from the base station through the detected common PDCCH. The terminal can obtain scheduling information about a downlink data channel or an uplink data channel through the received DCI information. That is, the DCI may include information about a resource area (or PDSCH transmission area) for the terminal to receive a PDSCH sent from the base station, or information about a resource area allocated by the base station for the terminal to send an uplink data channel (PUSCH). The DCI in operation 1304 includes information about the PDSCH transmission region in which the base station transmits the SIB, and the terminal obtains the information about the PDSCH transmission region from the DCI (1305). The terminal repeatedly performs operations 1302 to 1305 for all synchronization signal blocks detected in operation 1301 (1307). When the above process is completely performed on all synchronization signal blocks detected in operation 1301, the terminal decodes or combines all PDSCHs used to obtain resource region information together, thereby obtaining one system information block (1306).

[0146] Fig.14An example of a method in which a base station transmits a plurality of PDSCHs including the same system information block is shown. First, the base station may actually transmit a synchronization signal block #0 1401 and a synchronization signal block #3 1402. The base station transmits downlink control information in each CORESET 1403 and CORESET 1404, which are configured by the MIB included in each transmitted synchronization signal block #0 1401 and #3 1402 and are located in each continuous time slot. The base station may transmit the same system information block on PDSCH resources 1405 and 1406 scheduled in each segment of the downlink control information. As described above, the terminal detects the synchronization signal blocks 1401 and 1402 actually transmitted, and detects the segment of the downlink control information from the CORESETs 1403 and 1404 configured in the detected synchronization signal blocks. The terminal can decode or combine and receive all PDSCHs 1405 and 1406 scheduled in the detected downlink control information segment in which the same system information block is transmitted, thereby obtaining one system information block. Fig.14 An embodiment is shown in which the base station sends a maximum of 4 synchronization signal blocks in the frequency range FR1, but the aforementioned embodiment is not limited to the frequency range FR1 and can be applied to the frequency range FR2 and various maximum numbers of synchronization signal blocks.

[0147] Implementation Plan 2-2-2

[0148] The base station determines in advance through a protocol with the terminal the transmission resource position of the PDSCH corresponding to one or more synchronization signal blocks and transmitting the system information block. Specifically, the base station can repeatedly transmit the system information block scheduled by the downlink control information detected in the CORESET configured by the MIB of the synchronization signal block actually transmitted on the resources defined by the same subcarrier position and the same OFDM symbol position in continuous time slots or periodic time slots. Therefore, the terminal only detects one synchronization signal block without detecting all the system information blocks actually transmitted, and obtains a section of downlink control information detected in the CORESET configured by the MIB. The resources of the repeatedly transmitted PDSCH can be allocated to the terminal through the obtained downlink control information, and therefore, one or more PDSCHs through which all system information blocks are transmitted can be decoded or combined and received, thereby obtaining a system information block. The number of times or time period resources for which the PDSCH transmitting the system information block is repeatedly transmitted can be included in the downlink control information or can be included in the MIB. The base station may configure the aforementioned information segment in the terminal through L1 signaling (downlink channel) or a master information block (MIB), or the aforementioned information segment may be configured as a value agreed upon between the terminal and the base station. As described above, since the configurable resources of the PDSCH corresponding to each synchronization signal block are limited, in this embodiment, the PDSCH repeatedly transmitted by the base station may correspond to one synchronization signal block or multiple synchronization signal blocks. That is, the base station may transmit the repeatedly transmitted PDSCH through the same beam or through multiple beams.

[0149] Fig.15 The process of a terminal receiving multiple PDSCHs to obtain a system information block according to embodiment 2-2-2 is shown.

[0150] See also Fig.15, the base station periodically sends a synchronization signal block including a synchronization signal and a PBCH to multiple terminals in the system, and the terminal obtains time and frequency synchronization through the synchronization signal, and obtains the MIB (1501) as necessary system information through the PBCH. The terminal monitors or retrieves the common downlink control channel (common PDCCH) (1502) in the common downlink control channel area (hereinafter referred to as CORESET or search space) based on the time domain and frequency domain information indicated by the MIB. When the terminal detects the common PDCCH, the terminal obtains the downlink control information DCI (1503) sent by the base station through the detected common PDCCH. The terminal can obtain scheduling information about the downlink data channel or the uplink data channel through the received DCI information. That is, the DCI may include information about the resource area (or PDSCH transmission area) for the terminal to receive the PDSCH sent from the base station, or information about the resource area allocated by the base station for the terminal to send the uplink data channel (PUSCH). In operation 1503, the DCI obtained by the terminal includes information about the PDSCH transmission area in which the base station sends the SIB, and the terminal obtains information about the PDSCH transmission area from the DCI (1504). When obtaining the resource area information, the terminal decodes or combines and receives all repeated PDSCHs together, thereby obtaining a system information block (1505).

[0151] Fig.16 An embodiment in which a base station transmits a plurality of PDSCHs including the same system information block is shown. First, the base station may actually transmit synchronization signal block #0 1601, synchronization signal block #1 1602, synchronization signal block #2 1603, and synchronization signal block #3 1604. Through the MIB included in the transmitted synchronization signal blocks #0 1601, #1 1602, #2 1603, and #3 1604, the base station transmits downlink control information in CORESET 1611 in consecutive time slots corresponding to synchronization signal block #0 1601, CORESET 1612 in consecutive time slots corresponding to synchronization signal block #1 1602, CORESET 1613 in consecutive time slots corresponding to synchronization signal block #2 1603, and CORESET 1614 in consecutive time slots corresponding to synchronization signal block #3 1604. The base station transmits the same system information block in PDSCH resources 1621, 1622, 1623, and 1624 scheduled in each segment of the downlink control information.

[0152] The terminal detects a synchronization signal block (e.g., synchronization signal block #1 1602) and detects downlink control information in a CORESET (e.g., 1612) configured in the detected synchronization signal block. The terminal can combine and receive all PDSCHs (e.g., 1622, 1623, and 1624) through which system information blocks are transmitted in resource information configured by the detected downlink control information. Here, since the terminal pre-sends system information blocks in the PDSCH on the same symbol and frequency resources in consecutive time slots (i.e., repeatedly transmitted in a total of 8 time slots), the terminal can receive system information blocks from the PDSCH even if all synchronization signal blocks are not detected. Although Fig.16 An embodiment is shown in which the base station sends a maximum of 4 synchronization signal blocks in the frequency range FR1, but the aforementioned embodiment is not limited to the frequency range FR1 and can be applied to the frequency range FR2 and various maximum numbers of synchronization signal blocks.

[0153] Each of the foregoing embodiments is not intended to provide a single method for allocating resources to a PDSCH for transmitting a system information block (or SIB1), or to provide a single method for repeatedly sending a system information block; and some or all of one or more embodiments may be combined to provide a method for allocating resources to a PDSCH for transmitting a system information block, or to provide a method for repeatedly sending a system information block.

[0154] Fig.17 is a block diagram of a terminal according to an embodiment of the present invention.

[0155] See also Fig.17 , the terminal 1700 may include a transceiver 1710, a controller 1720 and a storage unit 1730. The transceiver 1710, the controller 1720 and the storage unit 1730 of the terminal 1700 may operate according to the aforementioned embodiments. However, the components of the terminal 1700 according to the present embodiment are not limited to the above examples, and the terminal 1700 may include a greater number of components or a lesser number of components than the components shown. In a specific instance, the transceiver 1710, the controller 1720 and the storage unit 1730 may be configured as a single chip.

[0156] According to another embodiment, the transceiver 1710 may be configured as a transmitter and a receiver. The transceiver 1710 may send and receive signals to and from a base station, and the signals may include control information and data. To this end, the transceiver 1710 may include an RF transmitter and an RF receiver, the RF transmitter being used to up-convert and amplify the frequency of the transmitted signal, and the RF receiver being used to perform low-noise amplification and down-conversion on the received signal. In addition, the transceiver 1710 may receive a signal through a radio channel to output the signal to the controller 1720, and may send a signal output from the controller 1720 through a radio channel.

[0157] The controller 1720 may control a series of processes so that the terminal 1700 can operate according to the aforementioned embodiments of the present disclosure. For example, according to an embodiment of the present disclosure, the controller 1720 may control various methods for sending and receiving a data channel through which a system information block is transmitted, that is, a method for configuring resources of a data channel for a system information block or a method for repeatedly receiving a data channel for a system information block. The controller 1720 may be configured as at least one processor.

[0158] The storage unit 1730 may store control information, such as resource configuration of a data channel of a system information block included in a signal obtained by the terminal 1700, and a repetition period and number of times of a data channel of the system information block, or data, and may include an area for storing data required for the controller 1720 to perform control and an area for storing data generated when the controller 1720 performs control.

[0159] Fig.18 is a block diagram of a base station according to an embodiment of the present invention.

[0160] See also Fig.18 , the base station 1800 may include a transceiver 1810, a controller 1820, and a storage unit 1830. The transceiver 1810, the controller 1820, and the storage unit 1830 of the base station 1800 may operate according to the aforementioned embodiment. However, the components of the base station 1800 according to the present embodiment are not limited to the aforementioned examples, and the base station 1800 may include a greater number of components or a lesser number of components than the aforementioned components. In a specific instance, the transceiver 1810, the controller 1820, and the storage unit 1830 may be configured as a single chip.

[0161] According to another embodiment, the transceiver 1810 may be configured as a transmitter and a receiver. The transceiver 1810 may send a signal to a terminal and receive a signal from the terminal. The signal may include control information and data. To this end, the transceiver 1810 may include an RF transmitter and an RF receiver, the RF transmitter being used to up-convert and amplify the frequency of the transmitted signal, and the RF receiver being used to perform low-noise amplification and down-conversion on the received signal. In addition, the transceiver 1810 may receive a signal through a radio channel to output the signal to the controller 1820, and may send a signal output from the controller 1820 through a radio channel.

[0162] According to the aforementioned embodiment of the present disclosure, the controller 1820 may control a series of processes to enable the base station 1800 to operate. For example, according to an embodiment of the present disclosure, the controller 1820 may control various methods for transmitting and receiving a data channel through which a system information block is transmitted, that is, a method for configuring resources for a data channel of a system information block or a method for repeatedly transmitting a data channel of a system information block. The controller 1820 may be configured as at least one processor.

[0163] The storage unit 1830 can store control information, such as the resource configuration of the data channel of the system information block determined by the base station 1800, as well as the repetition period and number of the data channel of the system information block, data or control information, and data received from the terminal, and may include an area for storing data required for the controller 1820 to perform control and an area for storing data generated when the controller 1820 performs control.

[0164] The embodiments of the present disclosure described and shown in the specification and the drawings are only specific examples, which are presented to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical ideas of the present disclosure can be achieved.

[0165] Furthermore, it is apparent that one or more of the above-described embodiments may be employed partially or completely in combination.

Claims

1. A method performed by a terminal (1700) in a wireless communication system, the method comprising: Receiving a synchronization signal block SSB from a base station (1800); receiving, from the base station, downlink control information for scheduling a plurality of physical downlink shared channels (PDSCHs) in which a system information block (SIB) is transmitted, based on a master information block (MIB) included in the SSB; Identify the transmission period and repetition number of the SIB; as well as repeatedly receiving the SIB from the base station in a plurality of time slots based on the scheduled plurality of PDSCHs, the transmission period and the number of repetitions, In each of the plurality of time slots, the repeatedly received SIB is received at the same position in the time domain and the frequency domain. 2 . The method according to claim 1 , wherein according to the transmission period, the number of times the SIB is repeatedly received through the scheduled plurality of PDSCHs is the same as the number of repetitions.

3. The method according to claim 2, wherein in each of the plurality of time slots, the repeatedly received SIB is received at the same OFDM symbol position in the time domain and at the same subcarrier position in the frequency domain, and in, The receiving of the SIB includes: not monitoring a control resource set CORESET corresponding to the SSB when the SIB is repeatedly received through the scheduled multiple PDSCHs.

4. The method according to claim 1, wherein the transmission period and the repetition number are included in the downlink control information, included in the MIB, or identified according to a value predetermined in the terminal.

5. A method performed by a base station (1800) in a wireless communication system, the method comprising: Sending a synchronization signal block SSB to the terminal (1700); Sending, to the terminal, downlink control information for scheduling a plurality of physical downlink shared channels PDSCH in which a system information block SIB is transmitted, based on a master information block MIB included in the SSB; identifying a transmission period and a repetition number of the SIB; and repeatedly sending the SIB to the terminal in multiple time slots based on the scheduled multiple PDSCHs, the transmission period and the number of repetitions, In each of the multiple time slots, the repeatedly transmitted SIB is transmitted at the same position in the time domain and the frequency domain.

6. The method according to claim 5, wherein according to the transmission period, the number of times the SIB is repeatedly transmitted through the scheduled multiple PDSCHs is the same as the number of repetitions, and In each of the multiple time slots, the repeatedly transmitted SIB is transmitted at the same OFDM symbol position in the time domain and the same subcarrier position in the frequency domain.

7. The method according to claim 5, wherein: The transmission period and the repetition number are included in the downlink control information, included in the MIB, or identified according to a value predetermined in the base station.

8. A terminal (1700) in a wireless communication system, the terminal comprising: a transceiver (1710) configured to transmit or receive a signal; as well as The controller (1720) is configured as follows: Receive a synchronization signal block SSB from a base station (1800), receiving, from the base station, downlink control information for scheduling a plurality of physical downlink shared channels PDSCH in which a system information block SIB is transmitted, based on a master information block MIB included in the SSB, Identify the transmission period and repetition number of the SIB, and repeatedly receiving the SIB from the base station in a plurality of time slots based on the scheduled plurality of PDSCHs, the transmission period and the number of repetitions, In each of the plurality of time slots, the repeatedly received SIB is received at the same position in the time domain and the frequency domain. 9 . The terminal according to claim 8 , wherein according to the transmission period, the number of times the SIB is repeatedly received through the scheduled plurality of PDSCHs is the same as the number of repetitions.

10. The terminal according to claim 9, wherein in each of the plurality of time slots, the repeatedly received SIB is received at the same OFDM symbol position in the time domain and at the same subcarrier position in the frequency domain, and in, The controller does not monitor a control resource set CORESET corresponding to the SSB when the SIB is repeatedly received through the scheduled plurality of PDSCHs.

11. The terminal according to claim 8, wherein the transmission period and the repetition number are included in the downlink control information, included in the MIB, or identified according to a value predetermined in the terminal.

12. A base station (1800) in a wireless communication system, the base station comprising: a transceiver (1810) configured to transmit or receive a signal; as well as The controller (1820) is configured as follows: Sending a synchronization signal block SSB to the terminal (1700), sending, to the terminal, downlink control information for scheduling a plurality of physical downlink shared channels PDSCH in which a system information block SIB is transmitted, based on a master information block MIB included in the SSB, Identify the transmission period and repetition number of the SIB, and repeatedly sending the SIB to the terminal in multiple time slots based on the scheduled multiple PDSCHs, the transmission period and the number of repetitions, In each of the multiple time slots, the repeatedly transmitted SIB is transmitted at the same position in the time domain and the frequency domain. 13 . The base station according to claim 12 , wherein according to the transmission period, the number of times the SIB is repeatedly transmitted through the scheduled multiple PDSCHs is the same as the number of repetitions. 14 . The base station according to claim 13 , wherein in each of the plurality of time slots, the repeatedly transmitted SIB is transmitted at the same OFDM symbol position in the time domain and at the same subcarrier position in the frequency domain.

15. The base station according to claim 12, wherein the transmission period and the repetition number are included in the downlink control information, included in the MIB, or identified according to a value predetermined in the base station.

Images