Apparatus and method for performing communication using limited bandwidth in wireless communication system

Abstract

The present disclosure is a method for performing communication using limited bandwidth in a wireless communication system. A method of operating a terminal may comprise the steps of: performing a random access procedure; receiving information related to resource allocation for downlink communication; and receiving a downlink signal based on the resource allocation. The resource allocation may be a resource allocation such that a total number of resource blocks (RBs) of a plurality of discontinuous resources in the frequency domain is not greater than a maximum number of RBs of the terminal.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to an apparatus and method for performing communication by using a limited bandwidth in a wireless communication system. Background Art

[0002] Wireless communication systems have been widely deployed to provide various types of communication services, such as voice or data. Generally speaking, wireless communication systems are multiple access systems that support communication for multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency division multiple access (SC-FDMA) systems.

[0003] In particular, since a large number of communication devices require a large communication capacity, an enhanced mobile broadband (eMBB) communication technology is being proposed compared to a conventional radio access technology (RAT). In addition, not only a large-scale machine type communication (massive MTC) that provides various services anytime and anywhere by connecting multiple devices and objects is being proposed, but also a communication system that takes into account services / user terminal devices (UEs) that are sensitive to reliability and latency is being proposed. Various technical configurations are proposed for this purpose. Summary of the invention

[0004] Technical issues

[0005] The present disclosure may provide an apparatus and method for efficiently performing communication by using a limited bandwidth in a wireless communication system.

[0006] The present disclosure may provide an apparatus and method for performing a random access procedure by considering use of a limited bandwidth in a wireless communication system.

[0007] The present disclosure may provide an apparatus and method for transmitting additional information by using a message-2 (MSG2) during a random access procedure in a wireless communication system.

[0008] The present disclosure may provide an apparatus and method for transmitting additional information by using an uplink grant in a wireless communication system.

[0009] The present disclosure may provide an apparatus and method for transmitting additional information by using spare bits of a Frequency Domain Resource Allocation (FDRA) field within an uplink grant in a wireless communication system.

[0010] The present disclosure may provide an apparatus and method for transmitting additional information by using bits of a channel state information (CSI) request field within an uplink grant in a wireless communication system.

[0011] The present disclosure may provide an apparatus and method for notifying capability information of a terminal based on a random access channel (RACH) opportunity and a RACH preamble in a wireless communication system.

[0012] The present disclosure may provide an apparatus and method for transmitting additional information by using a message-3 (MSG3) during a random access procedure in a wireless communication system.

[0013] The present disclosure may provide an apparatus and method for indicating a plurality of non-contiguous resources in a wireless communication system.

[0014] The present disclosure may provide an apparatus and method for indicating resources based on an offset for a specific channel in a wireless communication system.

[0015] The technical objects to be implemented in the present disclosure are not limited to the above-mentioned contents, and a person skilled in the art in the field to which the technical configuration of the present disclosure is applied may consider other technical objects not mentioned therein from the embodiments of the present disclosure to be described below.

[0016] Technical Solution

[0017] As an example of the present disclosure, a method for operating a terminal in a wireless communication system may include: performing a random access procedure, receiving information related to resource allocation for downlink communication, and receiving a downlink signal based on the resource allocation. The resource allocation may be a non-contiguous plurality of resources in the frequency domain, and the sum of resource blocks (RBs) of the plurality of resources may be less than or equal to the maximum number of RBs of the terminal.

[0018] As an example of the present disclosure, a method for operating a base station in a wireless communication system may include: performing a random access procedure, sending information related to resource allocation for downlink communication, and sending a downlink signal to a terminal based on the resource allocation. The resource allocation may be a non-contiguous plurality of resources in the frequency domain, and the sum of resource blocks (RBs) of the plurality of resources may be less than or equal to a maximum number of RBs of the terminal.

[0019] As an example of the present disclosure, a terminal in a wireless communication system may include a transceiver and a processor coupled to the transceiver. The processor may be configured to perform a random access procedure, receive information related to resource allocation for downlink communication, and receive a downlink signal based on the resource allocation. The resource allocation may be a non-contiguous plurality of resources in the frequency domain, and the sum of resource blocks (RBs) of the plurality of resources may be less than or equal to the maximum number of RBs of the terminal.

[0020] As an example of the present disclosure, a base station in a wireless communication system may include a transceiver and a processor coupled to the transceiver. The processor may be configured to: perform a random access procedure, send information related to resource allocation for downlink communication, and send a downlink signal to a terminal based on the resource allocation. The resource allocation may be a non-contiguous plurality of resources in the frequency domain, and the sum of resource blocks (RBs) of the plurality of resources may be less than or equal to the maximum number of RBs of the terminal.

[0021] As an example of the present disclosure, a communication device may include at least one processor and at least one computer memory, the at least one computer memory being coupled to the at least one processor and storing instructions that, when executed by the at least one processor, indicate operations. These operations may include: performing a random access procedure, receiving information related to resource allocation for downlink communication, and receiving a downlink signal based on the resource allocation. The resource allocation may be a non-contiguous plurality of resources in the frequency domain, and the sum of the resource blocks (RBs) of the plurality of resources may be less than or equal to the maximum number of RBs of the terminal.

[0022] As an example of the present disclosure, a non-transitory computer-readable medium storing at least one instruction may include the at least one instruction that can be executed by a processor. The at least one instruction may control a device to perform a random access procedure, receive information related to resource allocation for downlink communication, and receive a downlink signal based on the resource allocation. The resource allocation may be a non-contiguous plurality of resources in the frequency domain, and the sum of the resource blocks (RBs) of the plurality of resources may be less than or equal to the maximum number of RBs of the terminal.

[0023] The above aspects of the present disclosure are only a part of the exemplary embodiments of the present disclosure, and those skilled in the art can derive and understand various embodiments reflecting the technical features of the present disclosure based on the following detailed description of the present disclosure.

[0024] Beneficial Effects

[0025] As apparent from the above description, the embodiments of the present disclosure have the following effects.

[0026] According to the present disclosure, the random access procedure can be improved.

[0027] Those skilled in the art will appreciate that the effects that can be achieved by the embodiments of the present disclosure are not limited to the above effects, and other beneficial effects of the present disclosure will be more clearly understood from the following detailed description. That is, those skilled in the art can derive unexpected effects according to the embodiments of the present disclosure from the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are provided to help understand the present disclosure, and may provide embodiments of the present disclosure together with the detailed description. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. The reference numerals in each drawing may refer to structural elements.

[0029] Figure 1 An example of a structure of a wireless communication system to which the present disclosure can be applied is illustrated.

[0030] Figure 2 An example of a wireless device applicable to the present disclosure is illustrated.

[0031] Figure 3 The frame structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0032] Figure 4 An example of a resource grid in a wireless communication system to which the present disclosure can be applied is illustrated.

[0033] Figure 5 An example of a physical resource block in a wireless communication system to which the present disclosure can be applied is illustrated.

[0034] Figure 6 An example of a time slot structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0035] Figure 7 An example of a physical channel used in a wireless communication system to which the present disclosure is applicable and an example of a general signal transmission and reception method using the physical channel are illustrated.

[0036] Figure 8a An example of a contention-based random access (CBRA) procedure to which the present disclosure may be applied is illustrated.

[0037] Figure 8b An example of a contention-free random access (CFRA) procedure to which the present disclosure may be applied is illustrated.

[0038] Fig. 9 An example of a medium access control (MAC) control element (CE) structure of message-2 (MSG2) is illustrated.

[0039] Fig.10 An example of the uplink grant field structure of MSG2 is illustrated.

[0040] Fig.11 An example of partitioning a shared channel bandwidth in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0041] Fig.12An example of a physical downlink / uplink shared channel (PxSCH)-bandwidth part (BWP) in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0042] Fig.13 An example of a channel bandwidth operation scheme for uplink and downlink in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0043] Fig.14 An example of a channel bandwidth (BW) or a bandwidth part (BW(P)) of an uplink and a downlink in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0044] Fig.15 A configuration example of the BW(P) of a specific channel in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0045] Fig.16 An example of an allocation scheme of PxSCH in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0046] Fig.17 An example of a sounding reference signal (SRS) transmission scheme in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0047] Fig.18 An example of an operation scheme of new downlink control information (DCI) in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0048] Fig.19 An example of an operation scheme of a new DCI in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0049] Fig. 20 An example of a process of receiving a downlink signal in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0050] Fig.21 An example of a process of transmitting a downlink signal in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0051] Fig. 22 An example of a process of transmitting additional information by using MSG2 of a random access procedure in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0052] Fig.23 An example of a process of exchanging terminal information by using a random access preamble in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0053] Fig.24An example of a procedure of transmitting additional information by using message-3 (MSG3) of a random access procedure in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0054] Fig.25 An example of a process of indicating a bandwidth in a wireless communication system according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0055] The embodiments of the present disclosure described below are combinations of elements and features of the present disclosure in a particular form. Unless otherwise mentioned, elements or features may be considered to be selective. Each element or feature may be put into practice without being combined with other elements or features. In addition, embodiments of the present disclosure may be constructed by combining some elements and / or features. The order of operations described in the embodiments of the present disclosure may be rearranged. Some structures or elements of any one embodiment may be included in another embodiment and may be replaced with the corresponding structures or features of another embodiment.

[0056] In the description of the drawings, processes or steps that render the scope of the present disclosure unnecessarily ambiguous will be omitted, and processes or steps that can be understood by those skilled in the art will be omitted.

[0057] Throughout the specification, when a part "includes" or "comprises" a component, this indicates that other components are not excluded and may further be included, unless otherwise specified. The terms "unit", "-or / er" and "module" described in this specification indicate a unit for processing at least one function or operation, which can be implemented by hardware, software or a combination thereof. In addition, "a" or "an", "one", "the", etc. in the context of the present disclosure (more specifically, in the context of the appended claims) may include singular and plural expressions, unless otherwise specified in the specification or unless the context clearly indicates otherwise.

[0058] In the embodiments of the present disclosure, the data transmission and reception relationship between the base station (BS) and the mobile station is mainly described. The BS refers to the terminal node of the network, which directly communicates with the mobile station. The specific operation described as being performed by the BS can be performed by the upper node of the BS.

[0059] That is, it is apparent that in a network composed of a plurality of network nodes including a BS, various operations performed for communication with a mobile station may be performed by the BS or network nodes other than the BS. The term "BS" may be replaced with a fixed station, a Node B, an evolved Node B (eNode B or eNB), an advanced base station (ABS), an access point, etc.

[0060] In an embodiment of the present disclosure, the term terminal may be replaced with UE, mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, advanced mobile station (AMS), etc.

[0061] The transmitter is a fixed and / or mobile node that provides data services or voice services, and the receiver is a fixed and / or mobile node that receives data services or voice services. Therefore, on the uplink (UL), the mobile station can act as a transmitter and the BS can act as a receiver. Similarly, on the downlink (DL), the mobile station can act as a receiver and the BS can act as a transmitter.

[0062] The embodiments of the present disclosure may be supported by at least one of the standard specifications disclosed for wireless access systems including the Institute of Electrical and Electronics Engineers (IEEE) 802.xx system, the 3rd Generation Partnership Project (3GPP) system, the 3GPP Long Term Evolution (LTE) system, the 3GPP Fifth Generation (5G) New Radio (NR) system, and the 3GPP2 system. Specifically, the embodiments of the present disclosure may be supported by the standard specifications 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS36.321, and 3GPP TS 36.331.

[0063] In addition, the embodiments of the present disclosure are applicable to other radio access systems and are not limited to the above-mentioned systems. For example, the embodiments of the present invention are applicable to systems applied after the 3GPP 5G NR system and are not limited to a specific system.

[0064] That is, steps or parts that are not described to clarify the technical features of the present disclosure may be supported by those documents. In addition, all terms as proposed herein may be interpreted by standard documents.

[0065] Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The detailed description given below with reference to the accompanying drawings is intended to explain exemplary embodiments of the present disclosure, rather than to show the only embodiments that can be implemented according to the present disclosure.

[0066] The following detailed description includes specific terms in order to provide a thorough understanding of the present disclosure. However, it is obvious to those skilled in the art that other terms may be used to replace specific terms without departing from the technical spirit and scope of the present disclosure.

[0067] The embodiments of the present disclosure can be applied to various radio access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc.

[0068] Hereinafter, in order to clarify the following description, the description is based on the 3GPP communication system (e.g., LTE, NR, etc.), but the technical spirit of the present disclosure is not limited thereto. LTE may refer to the technology after 3GPP TS 36.xxx version 8. Specifically, the LTE technology after 3GPP TS 36.xxx version 10 may be referred to as LTE-A, and the LTE technology after 3GPP TS 36.xxx version 13 may be referred to as pre-LTE-A. 3GPP NR may refer to the technology after TS 38.xxx version 15. 3GPP 6G may refer to the technology after TS version 17 and / or version 18. "xxx" may refer to the detailed number of the standard document. LTE / NR / 6G may be collectively referred to as the 3GPP system.

[0069] 3GPP 6G may refer to post-3GPP NR technology based on the 3GPP system. 3GPP 6G may not be limited to a version or a specific TS document, and its name may have a different form from 3GPP 6G. That is, 3GPP 6G may refer to a technology introduced after 3GPP NR, and is not limited to a specific form.

[0070] The following description will mainly focus on the 3GPP NR system, but is not limited thereto, and can be applied to 3GPP 6G. In addition, the content described below may be partially modified to be used in consideration of the 3GPP 6G system, and is not limited to a specific form. However, in the following, for ease of explanation, the 3GPP NR system will be mainly described. For the background technology, terms, abbreviations, etc. used in this disclosure, please refer to the matters described in the standard documents published before this disclosure. For example, standard documents 36.xxx and 38.xxx may be referenced.

[0071] Overall system

[0072] As more and more communication devices require greater communication capacity, the demand for mobile broadband communications that are more enhanced than existing radio access technologies (RATs) is rising. In addition, large-scale machine type communications (MTC) that provide various services anytime and anywhere by connecting multiple devices and things is also one of the main issues worth considering in next-generation communications. In addition, the design of communication systems that consider services / terminals that are sensitive to reliability and latency is also under discussion. Therefore, the introduction of next-generation RATs that consider enhanced mobile broadband communications (eMBB), massive MTC (mMTC), ultra-reliable low-latency communications (URLLC), etc. is under discussion, and for convenience, the corresponding technology is referred to as NR in this disclosure. NR is a representation of an example representing a 5G RAT.

[0073] The new RAT system including NR uses an OFDM transmission method or a similar transmission method. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the parameter set of the existing LTE / LTE-A as is, but support a wider system bandwidth (e.g., 100MHz). Alternatively, a cell may support multiple parameter sets. In other words, terminals operating according to different parameter sets may coexist in one cell.

[0074] A parameter set corresponds to one subcarrier spacing in the frequency domain. Because the reference subcarrier spacing is scaled by an integer N, different parameter sets can be defined.

[0075] In addition, new RAT systems including 6G may be considered as next generation RATs. New RAT systems including 6G may consider i) very high data speeds per device, ii) a large number of connected devices, iii) global connectivity, iv) very low latency, v) reduced energy consumption of battery-free IoT devices, vi) ultra-high reliability connectivity, and vii) connectivity intelligence with machine learning capabilities, but are not limited thereto. In view of the above, new RAT systems including 6G may consider using the terahertz (THz) band, i.e., a frequency higher than the NR system, for wider bandwidth and higher transmission speeds. RAT systems including 6G may overcome existing limitations by applying artificial intelligence / machine learning (AI / ML), but may not be limited thereto.

[0076] Figure 1 The structure of a wireless communication system to which the present disclosure can be applied is illustrated. Figure 1 , NG-RAN consists of gNBs that provide control plane (RRC) protocol terminations for the NG-Radio Access (NG-RA) user plane (i.e., new access stratum (AS) sublayer / packet data convergence protocol (PDCP) / radio link control (RLC) / MAC / PHY) and UE. The gNBs are interconnected through the Xn interface. In addition, the gNBs are connected to the new generation core (NGC) through the N2 interface. More specifically, the gNB is connected to the access and mobility management function (AMF) through the N2 interface and to the user plane function (UPF) through the N3 interface. Figure 1 It can be based on the structure of the NR system. Figure 1 The structure can be used in the 6G system as it is or by being partially modified, and is not limited to a specific form.

[0077] * Figure 2 An example of a wireless device applicable to the present disclosure is illustrated.

[0078] Reference Figure 2The wireless device 200 may send / receive radio signals via various wireless access technologies (e.g., LTE, LTE-A, pre-LTE-A, NR, 5G, 5G-A, 6G). The wireless device 200 may include at least one processor 202 and at least one memory 204, and may further include at least one transceiver 206 and / or at least one antenna 208.

[0079] The processor 202 may be configured to control the memory 204 and / or the transceiver 206 and implement the description, function, process, proposal, method and / or operation flow chart disclosed in this document. For example, the processor 202 may generate a first information / signal by processing the information in the memory 204, and then send a radio signal including the first information / signal through the transceiver 206. In addition, the processor 202 may receive a radio signal including a second information / signal through the transceiver 206, and then store information obtained from the signal processing of the second information / signal in the memory 204. The memory 204 may be connected to the processor 202 and store various information associated with the operation of the processor 202. For example, the memory 204 may store software code including instructions for implementing part or all of the processes controlled by the processor 202 or for implementing the description, function, process, proposal, method and / or operation flow chart disclosed in this document. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology. The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through at least one antenna 208. The transceiver 206 may be a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0080] Hereinafter, the hardware elements of the wireless device 200 will be described in further detail. Although not limited thereto, at least one processor 202 may implement at least one protocol layer (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), radio resource control (RRC), and service data adaptation protocol (SDAP)). At least one processor 202 may generate at least one protocol data unit (PDU) and / or at least one service data unit (SDU) according to the description, function, process, proposal, method, and / or operation flow chart disclosed in this document. At least one processor 202 may generate a message, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow chart disclosed in this document. At least one processor 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the function, process, proposal, and / or method disclosed in this document, and provide the signal to at least one transceiver 206. At least one processor 202 can receive a signal (e.g., a baseband signal) from at least one transceiver 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document.

[0081] At least one processor 202 may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. At least one processor 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, at least one application specific integrated circuit (ASIC), at least one digital signal processor (DSP), at least one digital signal processing device (DSPD), at least one programmable logic device (PLD), or at least one field programmable gate array (FPGA) may be included in at least one processor 202. The description, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, processes, or functions. Firmware or software configured to execute the description, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be included in at least one processor 202, or may be stored in at least one memory 204 and executed by at least one processor 202. The description, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, instructions, and / or instruction sets.

[0082] At least one memory 204 may be connected to at least one processor 202 and store various forms of data, signals, messages, information, programs, codes, instructions, and / or instructions. At least one memory 204 may be configured as a read-only memory (ROM), a random access memory (RAM), an erasable programmable read-only memory (EPROM), a flash memory, a hard disk, a register, a cache memory, a computer-readable storage medium, and / or a combination thereof. At least one memory 204 may be located inside and / or outside of at least one processor 202. In addition, at least one memory 204 may be connected to at least one processor 202 via various technologies such as a wired or wireless connection.

[0083] At least one transceiver 206 can send user data, control information, and wireless signals / channels mentioned in the method and / or operation flow chart of this document to at least one other device. At least one transceiver 206 can receive user data, control information, and wireless signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow chart disclosed in this document from at least one other device. For example, at least one transceiver 206 can be connected to at least one processor 202 and send and receive radio signals. For example, at least one processor 202 can control at least one transceiver 206 to send user data, control information, or radio signals to at least one other device. In addition, at least one processor 202 can control at least one transceiver 206 to receive user data, control information, or radio signals from at least one other device. In addition, at least one transceiver 206 can be connected to at least one antenna 208, and at least one transceiver 206 can be configured to send and receive user data, control information, and radio signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow chart disclosed in this document through at least one antenna 208. In this document, at least one antenna may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). At least one transceiver 206 may convert received radio signals / channels from RF band signals to baseband signals in order to facilitate processing of received user data, control information, and radio signals / channels using at least one processor 202. At least one transceiver 206 may convert user data, control information, and radio signals / channels processed using at least one processor 202 from baseband signals to RF band signals. To this end, at least one transceiver 206 may include an (analog) oscillator and / or a filter.

[0084] Reference Figure 2The components of the described wireless device may be referred to by other terms from the functional aspect. For example, the processor 202 may be referred to as a control unit, the transceiver 206 may be referred to as a communication unit, and the memory 204 may be referred to as a storage unit. In some cases, the communication unit may be used to mean at least a part of the processor 202 and the transceiver 206.

[0085] Reference Figure 2 The structure of the wireless device described may be understood as the structure of at least a portion of various devices. As an example, the structure may be at least a portion of various devices (e.g., a robot, a vehicle, an XR device, a handheld device, a home appliance, an IoT device, an AI device / server, etc.). In addition, according to various embodiments, in addition to Figure 2 In addition to the components illustrated in the figure, the device may further include other components.

[0086] For example, the device may be a handheld device such as a smart phone, a smart tablet, a wearable device (e.g., a smart watch, smart glasses), and a handheld computer (e.g., a laptop computer, etc.). In this case, the device may further include at least one of: a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc.; an interface unit that includes at least one port for connecting to another device (e.g., an audio input / output port, a video input / output port); and an input / output unit for inputting and outputting video information / signals, audio information / signals, data, and / or information input from a user.

[0087] For example, the device may be a mobile device such as a mobile robot, a vehicle, a train, a manned / unmanned aerial vehicle (AV), and a ship. In this case, the device may further include at least one of the following: a drive unit including at least one of an engine, a motor, a power train, wheels, brakes, and a steering device of the device; a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc.; a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device; an automatic driving unit that performs functions such as route maintenance, speed control, and destination setting; and a position measurement unit that obtains mobile object position information through a global positioning system (GPS) and various sensors.

[0088] For example, the device may be an XR device such as an HMD, a head-up display (HUD) provided in a vehicle, a television, a smartphone, a wearable device, a home appliance device, a digital signage, a vehicle, and a robot. In this case, the device may further include at least one of: a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc.; an input / output unit that obtains control information and data from the outside and outputs a generated XR object; and a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device.

[0089] For example, the device may be a robot, which may be classified according to the purpose or field of use as industrial use, medical use, home use, military use, etc. In this case, the device may further include at least one of: a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device; and a drive unit that moves robot joints and performs various other physical operations.

[0090] For example, the device may be an AI device such as a TV, a projector, a smartphone, a PC, a laptop, a digital broadcast terminal, a tablet, a wearable device, a set-top box (STB), a radio, a washing machine, a refrigerator, a digital signage, a robot, and a vehicle. In this case, the device may further include at least one of: an input unit that obtains various types of data from the outside; an output unit that generates an output associated with vision, hearing, or touch; a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device; and a training unit that uses learning data to learn a model composed of an artificial neural network. Figure 2 The structure of the wireless device illustrated in the example can be understood as a part of a RAN node (eg, a base station, a DU, a RU, a RRH, etc.). That is, Figure 2 The device illustrated in the example may be a RAN node. In this case, the device may further include a wired transceiver for fronthaul and / or backhaul communication. However, in the case where the fronthaul and / or backhaul communication is based on wireless communication, Figure 2 The at least one transceiver 206 illustrated in FIG. 2 may be used for fronthaul and / or backhaul communications and may not include a wired transceiver.

[0091] Figure 3 A frame structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0092] The NR system may support multiple parameter sets. Here, the parameter set may be defined by a subcarrier spacing and a cyclic prefix (CP) overhead. Here, multiple subcarrier spacings may be derived by scaling the default (reference) subcarrier spacing by an integer N (or μ). In addition, although it is assumed that very low subcarrier spacing is not used in very high carrier frequencies, the parameter set used herein may be selected independently of the frequency band. In addition, various frame structures according to multiple parameter sets may be supported in the NR system.

[0093] In the following, OFDM parameter sets and frame structures that can be considered in the NR system will be described. The various OFDM parameter sets supported in the NR system can be defined as shown in Table 1 below.

[0094] [Table 1]

[0095] μ <![CDATA[Δf=2 μ ·15[kHz]]]> CP 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0096] NR supports multiple parameter sets (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15kHz, a wide area of ​​the traditional cellular band is supported, and when the SCS is 30kHz / 60kHz, dense urban areas, lower latency and wider carrier bandwidth are supported, and when the SCS is 60kHz or higher, bandwidths greater than 24.25GHz are supported to overcome phase noise. The NR band is defined as two types of frequency ranges (FR1, FR2). FR1 and FR2 can be configured according to Table 2 below. In addition, FR2 can mean millimeter wave (mmW).

[0097] [Table 2]

[0098] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0099] Regarding the frame structure in the NR system, the sizes of various fields in the time domain are expressed in T c =1 / (Δf max ·N f ) is expressed in multiples of the time unit. Here, Δf max 480·10 3 Hz, and N f is 4096. Downlink and uplink transmissions are configured (organized) with T f =1 / (Δf max ·N f / 100)T c =10ms duration radio frame. Here, the radio frames are respectively configured with T sf =(Δf max ·N f / 1000)T c=10 subframes of duration of 1ms. In this case, there is one set of frames for uplink and one set of subframes for downlink. In addition, the transmission in uplink frame number i from the terminal should start T earlier than the corresponding downlink frame in the corresponding terminal. TA =(N TA +N TA，offset )T c For the subcarrier spacing configuration μ, the time slots in the subframe are The time slots in a radio frame are numbered in ascending order of A time slot is configured with A continuous OFDM symbol configuration is determined based on the CP Time slot in subframe The start time is the same as the OFDM symbol in the same subframe All terminals cannot perform transmission and reception at the same time, which means that not all OFDM symbols of a downlink slot or an uplink slot are available. [Table 3] shows the number of OFDM symbols per slot in a normal CP ( ), the number of time slots per radio frame ( ) and the number of time slots per subframe ( ), and Table 4 represents the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0100] [Table 3]

[0101]

[0102] [Table 4]

[0103]

[0104] Figure 3 This is an example about μ=2 (SCS is 60 kHz), and referring to Table 3, 1 subframe may include 4 slots. Figure 3 1 subframe = {1, 2, 4} slots shown in is an example, and the number of slots that can be included in 1 subframe is as defined in Table 3 or Table 4. In addition, a micro slot may include 2, 4, or 7 symbols or more or less. Regarding physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. may be considered. Hereinafter, the physical resources that may be considered in the NR system will be described in detail.

[0105] First, with respect to antenna ports, the antenna ports are defined so that the channel carrying the symbol in the antenna port can be inferred from the channel carrying another symbol in the same antenna port. When the large-scale characteristics of the channel carrying the symbol in one antenna port can be inferred from the channel carrying the symbol in another antenna port, the two antenna ports can be said to be in a quasi-co-location or quasi-co-location (QC / QCL) relationship. In this case, the large-scale characteristics include one or more of delay spread, Doppler spread, frequency offset, average received power, and receive timing.

[0106] In the 6G system, communication can be performed at the above-mentioned THz frequency band higher than the millimeter wave (mmW) frequency, and the same Figure 3 The same frame structure as shown, or a separate frame structure for the 6G system may be used, but is not limited to a specific form.

[0107] Figure 4 A resource grid in a wireless communication system to which the present disclosure may be applied is illustrated.

[0108] Reference Figure 4 , as an illustrative description, the resource grid is configured in the frequency domain with subcarriers, and one subframe is configured with 14·2 μ OFDM symbols, but the resource grid and subframe are not limited to this. In the NR system, the transmitted signal consists of OFDM symbols and One or more resource grids for each subcarrier. Here, represents the maximum transmission bandwidth, which may differ between uplink and downlink and between parameter sets. In this case, one resource grid can be configured for each μ and antenna port p. Each element of the resource grid for μ and antenna port p is called a resource element and is uniquely identified by an index pair (k, l'). Here, k = 0, ..., is an index in the frequency domain, and l'=0,..., refers to the position of a symbol in a subframe. When referring to a resource element in a slot, an index pair (k, l) is used. Here, l = 0, ..., The resource element (k, l') for μ and antenna port p corresponds to the complex value When there is no risk of confusion or no specific antenna port or parameter set is specified, the indices p and μ can be discarded and the complex value can be or a k，l′ In addition, a resource block (RB) is defined as consecutive subcarriers.

[0109] Point A plays the role of a common reference point for the resource block grid and is obtained as follows.

[0110] -OffsetToPointA for the primary cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping the SS / PBCH block used by the terminal for initial cell selection. It is expressed in resource blocks, assuming a subcarrier spacing of 15kHz for FR1 and 60kHz for FR2.

[0111] -absoluteFrequencyPointA represents the frequency position of point A, as expressed in absolute radio frequency channel number (ARFCN).

[0112] For subcarrier spacing configuration μ, the common resource blocks are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ is the same as "point A". Number of common resource blocks for subcarrier spacing configuration μ in the frequency domain The relationship between and resource element (k, l) is given in Equation 1 below.

[0113] [Equation 1]

[0114]

[0115] In Equation 1, k is defined relative to point A, so that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks are spaced from 0 to 1 in a bandwidth part (BWP). where i is the number of the BWP. Physical resource block n in BWP i PRB and public resource block n CRB The relationship between is given by the following equation 2.

[0116] [Equation 2]

[0117]

[0118] is the common resource block where the BWP starts relative to common resource block 0.

[0119] Figure 5 The physical resource blocks in the wireless communication system to which the present disclosure can be applied are illustrated. Figure 6 The following illustrates a time slot structure in a wireless communication system to which the present disclosure can be applied.

[0120] Reference Figure 5 and Figure 6 , a slot includes a plurality of symbols in the time domain. For example, for a normal CP, a slot includes 7 symbols, but for an extended CP, a slot includes 6 symbols.

[0121] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined as multiple consecutive (physical) resource blocks in the frequency domain and may correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., 5) BWPs. Data communication may be performed through an activated BWP, and only one BWP may be activated for one terminal. In a resource grid, each element is called a resource element (RE) and may map a complex symbol.

[0122] In the NR system, each component carrier (CC) can support up to 400MHz. If the terminal working in such a wideband CC always operates with the radio frequency (FR) chip for the entire CC turned on, the terminal battery consumption may increase. Alternatively, when considering several application scenarios operating in a wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different parameter sets (e.g., subcarrier spacing, etc.) can be supported in each frequency band in the corresponding CC. Alternatively, each terminal may have a different maximum bandwidth capability. In this regard, the base station may instruct the terminal to operate only in part of the bandwidth instead of the total bandwidth of the wideband CC, and for convenience, the corresponding part of the bandwidth is defined as a bandwidth part (BWP). BWP can be configured with continuous RBs on the frequency axis and may correspond to a parameter set (e.g., subcarrier spacing, CP length, slot / microslot duration).

[0123] At the same time, even in one CC configured for the terminal, the base station can configure multiple BWPs. For example, a BWP occupying a relatively small frequency domain can be configured in the PDCCH monitoring time slot, and the PDSCH indicated by the PDCCH can be scheduled in a larger BWP. Alternatively, when the UE is congested in a specific BWP, some terminals can be configured with another BWP for load balancing. Alternatively, considering the frequency domain inter-cell interference elimination between adjacent cells, etc., some middle spectrums of the entire bandwidth can be excluded, and BWPs on two edges can be configured in the same time slot. In other words, the base station can configure at least one DL / UL BWP for a terminal associated with a broadband CC. The base station can activate at least one DL / UL BWP in the configured DL / UL BWP at a specific time (through L1 signaling or MAC control unit (CE) or RRC signaling, etc.). In addition, the base station can indicate switching to another configured DL / UL BWP (through L1 signaling or MAC CE or RRC signaling, etc.). Alternatively, based on a timer, when the timer value expires, it can switch to the determined DL / UL BWP. Here, the activated DL / UL BWP is defined as the active DL / UL BWP. However, when the terminal performs the initial access process or has not yet established an RRC connection, the configuration of the DL / UL BWP may not be received, so the DL / UL BWP assumed by the terminal in this case is defined as the initial active DL / UL BWP.

[0124] Figure 7 A physical channel used in a wireless communication system to which the present disclosure may be applied and a general signal transmission and reception method using the physical channel are illustrated.

[0125] In a wireless communication system, a terminal receives information from a base station via a downlink, and a terminal sends information to a base station via an uplink. The information sent and received by the base station and the terminal includes data and various control information, and there are various physical channels according to the type / purpose of the information they send and receive.

[0126] When the terminal is turned on or newly enters a cell, the terminal performs an initial cell search, which includes synchronization with a base station (S701). To this end, the terminal can synchronize with the base station by receiving a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station, and obtain information such as a cell identifier (ID). Next, the terminal can obtain broadcast information in the cell by receiving a physical broadcast channel (PBCH) from the base station. At the same time, the terminal can check the downlink channel state by receiving a downlink reference signal (DL RS) in the initial cell search step.

[0127] The terminal that has completed the initial cell search can obtain more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried in the PDCCH (S702).

[0128] Meanwhile, if the terminal accesses the base station for the first time or does not have radio resources for signal transmission, the terminal may perform a random access procedure (RACH) on the base station (S703 to S706). To this end, the terminal may send a specific sequence as a preamble through a physical random access channel (PRACH) (S703 and S705), and receive a response message to the preamble through a PDCCH and a corresponding PDSCH (S704 and S706). In the case of a contention-based RACH, a contention resolution process may be additionally performed.

[0129] The terminal that has performed the above process may then perform PDCCH / PDSCH reception (S707) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission (S708) as a general uplink / downlink signal transmission process. Specifically, the terminal receives downlink control information (DCI) through PDCCH. Here, DCI includes control information such as resource allocation information for the terminal, and has different formats depending on its purpose of use.

[0130] At the same time, the control information sent by the terminal to the base station through the uplink or received by the terminal from the base station includes downlink / uplink confirmation / non-confirmation (ACK / NACK) signal, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. For the 3GPP LTE system, the terminal can send the above-mentioned CQI / PMI / RI and other control information through PUSCH and / or PUCCH.

[0131] Specific embodiments of the present disclosure

[0132] The present disclosure relates to a random access procedure in a wireless communication system. In particular, the present disclosure relates to a technique for improving a random access procedure in a wireless communication system, and proposes various implementations for improving the efficiency of the random access procedure by considering an environment using limited bandwidth.

[0133] 5G NR provides services mainly through major technologies such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive Internet of Things (mIoT). mIoT is a communication method that is optimized based on small size and low power to reduce power consumption, unlike carrier aggregation (CA) that requires high performance and maximum throughput speed transmission.

[0134] In 5G NR, there are three main technologies, URLLC, eMBB and mIoT, and a hybrid technology of these three technologies may be provided. In 3GPP Release 17, a new device type that targets smart factories or wearable devices and requires low power and a certain level of transmission rate is called a reduced performance terminal, i.e., reduced capability (Redcap) UE. Here, unlike previous types, Redcap UE or Redcap terminal uses a narrow spectrum or narrow bandwidth as frequency resources. The predetermined frequency bandwidth used for a specific channel or signal transmission may not be fully used by the Redcap terminal, depending on how narrow the spectrum or bandwidth used is.

[0135] The present disclosure proposes a method for enhancing the reception rate and uplink related convenience of Message-3 (MSG3) during the PRACH process. In addition, the present disclosure describes various embodiments of sending MSG3 at the same time as sending an additional reference signal (RS) used to derive a basis for later scheduling PUSCH.

[0136] In the following, the present disclosure proposes a technique for improving the RACH process. Specifically, the present disclosure aims to enhance and / or improve MSG3 related operations when a terminal first accesses (i.e. attempts initial access) a base station in a narrow bandwidth or the terminal performs a RACH process in a connected mode due to a radio link failure (RLF) or handover. In other words, the present disclosure proposes a technique for improving the reception performance of MSG3 and triggering the transmission of MSG3 and additional RS signaling through control signaling.

[0137] In particular, the present disclosure proposes an implementation method of utilizing some bits in a frequency domain resource allocation (FDRA) field, which is preconfigured to mark a frequency region up to 100 MHz, on the grounds that information related to frequency allocation in a narrow bandwidth (e.g., 5 MHz or less) of a narrowband indicates up to 100 MHz but not higher. In other words, some bits in the FDRA field can be used for additional control signaling aimed at enhancing MSG3 performance and improving other functions. Therefore, a call can be stably operated after the PRACH process.

[0138] Typically, the amount of FDRA information indicating resource allocation may vary depending on the resource allocation method, but FDRA bits corresponding to approximately 14 to 18 bits are required to indicate resource allocation for 100 MHz. The FDRA field is typically included in DCI format 0_X for physical downlink shared channel (PDSCH) transmission or DCI format 1_X for physical uplink shared channel (PUSCH) transmission and is used as a means of allocating dynamic frequency resources. However, from the perspective of the uplink grant information of the random access response (RAR) in the RACH procedure, that is, from the perspective of high-level RRC signaling for MSG3 in the MAC CE, the FDRA field can be used for RRC connection or RRC connection reconstruction.

[0139] Figure 8a An example of a contention-based random access (CBRA) procedure to which the present disclosure is applicable is illustrated, and Figure 8b An example of a contention-free random access (CFRA) procedure to which the present disclosure is applicable is illustrated. Figure 8a and Figure 8b , the CBRA process includes sending and receiving four messages, MSG1, MSG2, MSG3 and MSG4, and the CFRA process includes sending and receiving two messages, MSG1 and MSG2, after the random access preamble is allocated. The random access response (RAR) known to MSG2 includes information related to the transmission of MSG3. For example, the information related to the transmission of MSG3 (S803) is included in the uplink grant information in the media access control (MAC) control element (CE) of the RAR. That is, MSG3 is not scheduled by the information of the PDCCH, but is scheduled by the uplink grant information of MSG2.

[0140] Fig. 9 An example of the MAC CE structure of MSG2 is illustrated. Fig. 9 , the information in the simple DCI is included in the MAC CE, and the payload 910 of the MAC CE includes a 27-bit uplink grant field 920. Fig.10 An example of the uplink grant field structure of MSG2 is shown. Fig. 9 and Fig.10 , since the size of the payload in the MAC CE is specified, it is not easy to allocate additional bits to the uplink grant field 920 in the payload 910. That is, when it is desired to allocate additional bits to the uplink grant field 920, the length of at least one of the existing fields needs to be reduced. For example, it may be considered to reduce the 4 bits of the MCS field 1020 to 2 bits, and use the remaining 2 bits as the MCS indicator. However, in this case, the indication of the MCS may be limited.

[0141] Since the Redcap terminal uses a narrowband, only some of the 14 bits of the FDRA field 1010 are used to indicate the narrowband, and the remaining bits are not used. Therefore, the present disclosure proposes various methods for performing additional control signaling by using at least one FDRA bit (a bit saved when a service area less than 20 MHz or 5 MHz is allocated to a terminal) and correspondingly maintaining the total number of bits of the uplink grant included in the RAR to 27.

[0142] The Redcap terminal uses a small bandwidth and uses a portion of the frequency band in the large bandwidth used by the normal terminal. Therefore, referring to Table 5 below, the Redcap terminal can know the information indicated by the value set by the 27 bits in the uplink grant of the RAR. Table 5 below shows the number of bits allocated to each field included in the uplink grant.

[0143] [Table 5]

[0144] RAR Authorization Field number of bilts Frequency hopping flag 1 PUSCH frequency resource allocation 14 PUSCH time resource allocation 4 MCS 4 TPC commands for PUSCH 3 CSI Request 1

[0145] Referring to Table 5, FDRA for PUSCH is configured with 14 bits to indicate a frequency up to 100 MHz. Therefore, in the case where the Redcap terminal uses a frequency band equal to or less than 20 MHz or 5 MHz, the number of required bits may be less than 14. For example, the frequency band to be allocated to the Redcap service may be equal to or less than 20 MHz or 5 MHz, and in this case, the number of bits of FDRA for PUSCH may be set as shown in Table 6 below.

[0146] [Table 6]

[0147]

[0148]

[0149] Referring to Table 6, as the bandwidth to be allocated decreases, the number of bits required for FDRA decreases, thereby generating available spare bits. Therefore, the remaining bits of FDRA can be used for signaling additional control information related to the transmission and reception of MSG3. In addition, the embodiments described below can also be applied to the shared channel of DCI. In the following description, the available bits generated by reducing the number of bits required for FDRA can be referred to as "spare bits", "residual bits", "remaining bits" or another term with equivalent technical meaning.

[0150] Implementation #1 : In case the number of bits required for FDRA is reduced, available control information for improving shared channel transmission can be included in the FDRA field.

[0151] Embodiment 1-1: In the case where the allocated bandwidth is equal to or less than 5 MHz, 5 bits are generated as spare bits, and thus the following information can be added.

[0152] - Information about the number of repetitions: The coverage extension scheme of Release 17 introduces a method to convert only 2 bits of the 4 bits of the MCS field (such as Figure 3 In the embodiment of the present invention, 4 bits (as shown) are used for the MCS indicator, and the remaining 2 bits are used for the repetition information of MSG3 to improve the reliability of MSG3. That is, since it is not easy to define additional fields in the uplink grant of RAR, the introduced method reduces the amount of information of the existing fields and adds information about the number of repetitions of MSG3. However, in this case, the number of available bits for MCS is reduced due to the reduction in the amount of information of the MCS field, and flexibility-related issues may arise accordingly. Therefore, information about the number of repetitions can be included in the spare bit part of FDRA instead of some bits of the existing MCS field. That is, the number of MCS bits can be maintained at 4, and new information about the number of repetitions can be included in a part of the existing FDRA field. Here, an additional 1 bit may be required to indicate whether the information about the number of repetitions of MSG3 is included in the existing MCS field or the FDRA field.

[0153] - Information related to TB processing (TBoMS) on multi-slot PUSCH: TBoMS means a method of transmitting channel coded bits across time slot units, which is different from repeated transmission. That is, TBoMS is a method of mapping the coded information obtained after LDPC to REs (not within one time slot but across multiple time slots), and can provide performance improvement in terms of code rate. According to an embodiment, TBoMS-related information may be included in the spare bit part of the FDRA field.

[0154] -SRS request: SRS request requires 2 bits. SRS is a reference signal sent from the terminal to the base station for PUSCH scheduling, and the base station can obtain the uplink channel state of the terminal based on the SRS. Generally, SRS can be sent in the RRC connection state. However, by simultaneously triggering MSG3 transmission and SRS transmission for SRS preconfigured resources, SRS can be sent after the RACH process. Therefore, the base station can obtain the necessary information for PUSCH scheduling in advance and efficiently operate the uplink based on the obtained information.

[0155] -Channel State Information (CSI) Request: A CSI request requires a maximum of 6 bits. According to the previous 4G LTE, a 1-bit CSI request in Table 5 was used. However, in 5G NR, the CSI request is in a reserved state. Therefore, the spare 5 bits generated by the allocated bandwidth equal to or less than 5MHz can be used for the CSI request together with the reserved 1 bit.

[0156] - Information related to sequence initialization of a demodulation reference signal (DMRS): This is information additionally indicated when the repetition and discrete Fourier transform-spread-OFDM (DFT-S-OFDM) technology of MSG3 is used. It can be included in the spare bit part of the FDRA field.

[0157] -MSG3 modulation scheme related information: Information indicating the MSG3 modulation scheme may be included in the spare bit portion of the FDRA field. For example, the spare bit portion of the FDRA field may include information indicating whether the MSG3 will be modulated using a cyclic prefix-OFDM (CP-OFDM) scheme or a DFT-S-OFDM scheme. In other words, information indicating the MSG3 waveform may be indicated by the spare bits of the FDRA field.

[0158] - Partitioned frequency band location information: In the case where 5 MHz is allocated for PUSCH in a 20 MHz channel bandwidth, information indicating which part of the 20 MHz corresponds to the allocated 5 MHz may be included in a spare bit portion of the FDRA field. That is, information indicating the allocated frequency band in the channel bandwidth may be indicated by a spare bit of the FDRA field. Fig.11 An example of partitioning of a shared channel bandwidth in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.11 As shown, in the case where a bandwidth 1110 of 20 MHz is partitioned by 5 MHz and the partitioned 5 MHz 1120 is allocated, partitioned band position information indicating which portion of the 20 MHz 1110 corresponds to the allocated 5 MHz 1120 may be included in a spare bit portion of the FDRA field.

[0159] like Fig.11 As shown, allocating channel bandwidth by partitioning the channel at equal intervals can be applied not only to the uplink through the uplink grant of RAR, but also to MSG2, MSG3, MSG4 and / or MSG5 of the RACH process in a limited manner, and the relevant information can be included in the spare bit part of the FDRA field in the DCI. The BWP of the shared channel is 5MHz at initial access, but this can be modified through the SIB and when the terminal is in a connected state.

[0160] In the case where the shared channel bandwidth is 5MHz and the entire channel bandwidth is 20MHz, the entire 20MHz channel bandwidth can be partitioned into 4 equal parts, and an operation form can be adopted so that information about the partition bandwidth can be sent as information about the shared channel (e.g., PDSCH, PUSCH). In this case, 2 bits of information are required to indicate which of the 4 partitions is used as a shared channel. Therefore, 2 bits of information about the location of the shared channel can be included in the spare bit portion of the FDRA.

[0161] According to an embodiment, the shared channel may not be configured by partitioning the entire channel bandwidth into predetermined sizes, but by a higher layer configuration. That is, the shared channel may be configured into multiple BWPs by a higher layer, and the multiple BWPs may be indicated as PxSCH-BWPs or bandwidth partitions and distinguished by corresponding allocation IDs. In this case, the ID of the shared channel may be indicated by a spare bit of FDRA. Fig.12 As shown, the BWP of the shared channel can be set for the control channel. Fig.12 An example of a PxSCH-BWP in a wireless communication system according to an embodiment of the present disclosure is illustrated. Regardless of a downlink channel, an uplink channel, a data channel, or a non-data channel, multiple BWPs may be configured, and each BWP may be assigned an ID. The ID of each BWP may be designed by MAC or DCI. However, for allocation to a terminal, a control allocation rule may be configured or predefined, i.e., only one BWP may be allocated instead of multiple BWPs.

[0162] As described above, a portion of the FDRA field within the uplink grant of MSG2 can be defined as a spare bit, and additional information can be signaled through the spare bit. Here, the additional information is information different from the information delivered through FDRA indicating the resources allocated on the frequency axis for MSG3 transmission, and can be understood as information used to assist subsequent communication operations (such as MSG3 reception).

[0163] In addition, the above-mentioned implementation #1 is not only applicable to MSG3 of the RACH process, but also applicable to typical shared channels (eg, PDSCH, PUSCH). The implementation #1 can also be applied to various DCI formats.

[0164] Implementation #2 : In the uplink grant of RAR, 1 bit of the CSI request related to the CSI report is used to signal different information.

[0165] 4G LTE defines that during the CFRA procedure, CSI reporting is controlled by the last bit field of the uplink grant. For example, Fig.10As shown, the uplink grant includes a 1-bit CSI request field 1030. This is because the CSI triggering of the DCI of LTE requires 1 bit. However, in LTE-A pro, the number of bits used for the CSI triggering of the DCI is increased to a maximum of 6. At the same time, NR defines the CSI triggering related bits as a reserved state, and the bits are not used. Therefore, in order to enhance the reception performance of MSG3, the bits of the CSI request field for requesting CSI reporting in the uplink grant can be used.

[0166] According to various embodiments, 1 bit of the CSI request field within an uplink grant may be used for the following purposes:

[0167] - Indicates information about TBoMs

[0168] - Indicates additional information related to repetition: the number of repetitions of MSG3 or the number of repetitions of another subsequent data transmission

[0169] -DMRS sequence initialization: This is information that can be additionally notified in the case of repeated MSG3 and DFT-S-OFDM. This information can be sent using the bits of the CSI request field.

[0170] - In order to additionally display other information, 1-bit information related to the CSI request can be grouped and signaled. In this case, other information can be indicated by using a method of connecting the corresponding bit to the spare bit of FDRA. For example, a control indication method related to the FDRA spare bit can be included.

[0171] -Indicates a modulation scheme among CP-OFDM or DFT-S-OFDM

[0172] As described above, the CSI request field within the uplink grant of MSG2 may be defined as a spare bit, and additional information may be signaled through the spare bit. Here, the additional information is information different from the information indicating CSI feedback delivered through the CSI request field, and may be understood as information used to assist subsequent communication operations (such as MSG3 reception).

[0173] Implementation #3 :A new uplink grant with 27 or more bits may be designed. For example, a new uplink grant with 27 or more bits may be designed by adding a new field, instead of the existing uplink grant limited to 27 bits, to improve the efficiency of Redcap. The new uplink grant included in the RAR may be designed to have a structure different from the existing uplink grant form. When designing a new uplink grant, not only Redcap but also other forms of services may be additionally considered.

[0174] like Fig. 9 and Fig.10 As shown, the size of the uplink grant of the current RAR is fixed to 27 bits. Therefore, for the additional functions related to MSG3 transmission, further performance improvement is expected when the uplink grant is designed in a new form of 27 or more bits. For example, when designing a new uplink grant, at least one of the following information fields may be added. Here, the uplink grant of the RAR may be understood as the role of DCI 0_X that performs the determination of the MSG3 transmission scheme in the RACH process.

[0175] - A field used to indicate that the number of repetitions is greater than the specified number of repetitions

[0176] - Additional information field used for situations where additional uplink beam related information needs to be notified to the terminal

[0177] - Information fields related to TBoMS

[0178] - Information fields related to triggering SRS transmission

[0179] -Information field related to carrier indication: As the PxSCH BWP information field, the PxSCH BWP information can be based on Fig.11 or Fig.12 information.

[0180] - Information fields related to control signaling of additional functions related to MSG3 performance improvements

[0181] -Information field indicating a modulation scheme in CP-OFDM or DFT-S-OFDM

[0182] Implementation #4 : How hypothetical situations related to early directives are implemented

[0183] In the RACH process, for the uplink grant included in the RAR of MSG2 before MSG3 is sent, the terminal may need to notify the base station whether the above-mentioned implementation modes #1 to #3 are applicable.

[0184] -Implementation 4-1: In the case of CBRA, the terminal cannot send capability information to the base station before the RACH process during the initial access process. Therefore, in the case of CBRA, the base station can pre-configure resources related to Redcap or some resources related to narrow bandwidth by partitioning the preamble of PRACH or using RACH opportunities. In other words, some preambles in the available preamble sequences can be allocated to indicate whether the above-mentioned implementations #1 to #3 are applicable, or some RACH opportunities in the configured RACH opportunities can be allocated to indicate whether the above-mentioned implementations #1 to #3 are applicable. Next, in the case of receiving a RACH preamble from the terminal on the RACH opportunity of the configured resources, the base station can determine that at least one of the above-mentioned implementations #1 to #3 is applicable to MSG3 of the terminal. In this case, the base station can indicate MSG3 related information in the RAR uplink grant of MSG2.

[0185] -Implementation 4-2: Since implementation 4-1 should maintain the configuration of PRACH-related resources, there is a problem of long-term low efficiency. Therefore, the uplink bandwidth part of the Redcap of Release 17 or the Redcap of Release 18 can be assigned to different positions from the beginning through SIB1. To this end, unlike the existing traditional uplink BWP, a separate initial UL BWP can be assigned to be initially used by the terminal for narrow bandwidth services. In this case, with respect to the Redcap of Release 18, multiple separate initial UL BWPs can be configured. For example, a 20MHz band can be configured as a separate initial UL BWP, the separate initial UL BWP can be partitioned into 4 equal 5MHz sub-UL bandwidths, and thus four separate initial 5MHz sub-UL BWPs can be configured. Here, by specifying each of the 4 separate initial sub-UL BWPs, whether the CE function is supported, whether the TBoMS function is supported, and / or one of the multiple types of the terminal, the terminal can be configured to send PRACH in the corresponding separate initial sub-UL BWP. The base station can identify the indication of the terminal type and capability through the separate initial sub-UL BWP and the RACH opportunity.

[0186] For example, refer to Fig.11 , a terminal supporting the CE function can start PRACH transmission in the first 5MHz, and a terminal supporting the CE function and the TBoMS function can start PRACH transmission in the second 5MHz. The base station can confirm that the terminal sending the RACH preamble code in the first 5MHz supports the CE function, and the terminal sending the RACH preamble code in the second 5MHz supports the CE function and the TBoMS function.

[0187] - Implementation 4-3: In the case of CFRA, since the terminal and the base station are RRC connected, and the base station or the network knows the capability information of the terminal, the base station can know in advance what information to send to the terminal through the RAR uplink grant of MSG2. Therefore, the schemes of Implementation #1, Implementation #2 and Implementation #3 are not applicable to every RACH process, but can be limited to the RACH process applied to CFRA according to the situation.

[0188] According to the implementation mode, the above implementation modes 4-1 and 4-2 can be applied simultaneously. For example, the RACH timing partitioning method of implementation mode 4-1 can be used for early indication of CE, and implementation mode 4-2 can be used to indicate Redcap information.

[0189] Additionally, a terminal supporting both Redcap and CE functions (or TBoMS) may inform the base station of the capabilities of the terminal based on the scheme shown in Case 1 or Case 2 below.

[0190] -Case 1: If the terminal has two or more capabilities, the terminal may send a RACH preamble in a separate initial UL BWP signaled through a SIB dedicated to Redcap (rather than in the existing initial UL BWP) through a RACH timing corresponding to the terminal capability (e.g., whether CE function or TBoMS function is supported) among the RACH timings corresponding to different capabilities.

[0191] - Case 2: Some resources of CE or Redcap related RACH opportunities corresponding to the existing initial UL BWP can be redundantly allocated to CE or Redcap through SIB.

[0192] Implementation #5 : Additional proposals related to MSG3 content

[0193] The terminal may include additional information in addition to the existing information in MSG3 and transmit MSG3 to the base station through PUSCH. Therefore, compared with transmitting the terminal capability information to the base station after the RRC connection is established between the terminal and the base station, the channel of the terminal may be operated from an earlier time.

[0194] At least one of the following types of information may be included in the PUSCH of MSG3.

[0195] -Whether half-duplex (HD)-frequency division duplex (FDD) is supported.

[0196] -Antenna or MIMO information: whether the receiving antenna is configured as a single antenna, whether it only supports a single layer, etc.

[0197] -Form factor type information: Form factor type information is information indicating a performance difference according to a device type (eg, IoT device, wearable device), and one example may be information showing a performance difference of about 3 dB.

[0198] -BWP feature information: Information about the BW or BWP of the downlink and / or uplink

[0199] - Information about whether CB and TBoMS functions are supported

[0200] - Device type information

[0201] The above listed information is generated at a higher layer, and may be generated in particular at a MAC layer or an RRC layer.

[0202] Implementation #6 : Operational scheme for specifying the BW (P) of each channel and the coexistence between radio frequency (RF) and baseband (BB) with different BW

[0203] In the case where the terminal uses the narrowband of 3GPP Release 18, the downlink and uplink can be operated with different bandwidth sizes by setting 20MHz for the downlink and 5MHz for the uplink (for example, by setting a BWP of up to 5MHz or limiting the uplink to 5MHz BW). This operation using different bandwidth sizes for the downlink and uplink can be applied from the initial stage to the connected mode and the inactive state. The scheme of operating the downlink bandwidth and the uplink bandwidth in different ways can achieve a frequency diversity effect in the 20MHz downlink and use a low-cost 5MHz power amplifier module (PAM) in the uplink. In general, the bandwidth used is often inversely proportional to the cost.

[0204] If in BW(P), the maximum bandwidth of the downlink is greater than the bandwidth of the uplink (for example, the downlink is 20MHz and the uplink is 5MHz), the base station can use an offset to indicate the uplink frequency band based on the downlink frequency band, thereby enabling uplink transmission of the terminal. The offset can be expressed in units of RB(G). The offset can be indicated by using a spare bit or other additional bits of FDRA. That is, the offset can be added to the DCI or RAR uplink grant. In this case, the maximum uplink bandwidth can be 5MHz, and the uplink bandwidth can be understood as a partitioned BW of the entire 20MHz BW.

[0205] The above implementation can be similarly applied to the case where the maximum bandwidth of the uplink is greater than that of the downlink. Fig.13In other words, the embodiments described below can also be applied to the case where the downlink bandwidth is limited and the allocated downlink BWP or bandwidth partition is indicated by an offset based on the uplink BWP or channel bandwidth. Fig.13 An example of a channel bandwidth operation scheme for uplink and downlink in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.13 , when the downlink bandwidth is 20 MHz and the uplink bandwidth is 5 MHz, the uplink bandwidth can be indicated by using the starting offsets 1301 and 1303 of the downlink bandwidth.

[0206] The starting offset for indicating the uplink bandwidth may be set based on the bandwidth of a specific channel or based on an existing BW(P). Fig.14 An example of the channel BW(P) of uplink and downlink in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.14 , the redcap BWP is exemplified as 15 MHz. Here, an offset 1403 indicating the start position of the bandwidth of a specific channel 1401 is set based on the redcap BWP 1410 of 15 MHz.

[0207] TDD can be Fig.14 As shown. However, according to TS 38.101, FDD has TX-RX split frequency bands. In the case where the downlink frequency band and the uplink frequency band are separated as in FDD, the uplink and downlink can have approximately the same bandwidth size. Here, the BWP can have different sizes between uplink and downlink. In Redcap according to Release 18, multiple BWPs can be introduced as described above. The size and / or position of the BWP can be based on the specific bandwidth configuration of the additional channel within the entire BWP. For example, Fig.15 As shown, the location of a specific channel within BW(P) 1501 and 20MHz BW(P) 1510 can be pre-configured in the high layer. The location of BW(P) 1501 and the specific channel can be changed in real time through PDSCH, PUSCH or DCI. For example, within the entire BWP, 5MHz PxSCH, 5MHz PUCCH, 5MHz PRACH, 20MHz SRS, 20MHz CSI-RS and 10MHz control resource set (CoreSet) can be configured in the high layer.

[0208] Fig.15 An example of configuring the BW(P) of a specific channel in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.15, based on individual TX-RX as shown in Table 7, the uplink offset can be indicated. The offset can be indicated on a per-channel basis, and in this case, the offset becomes a negative value. The uplink offset can be set based on the channel bandwidth, or as shown in Table 7. Fig.15 Shown is set in BW(P).

[0209] Of course, the corresponding channel is not indicated only by the offset. That is, as proposed in implementation #1, in a high layer, multiple BWPs or bandwidth partitions and related IDs can be configured for PxSCH as a data-related channel and RACH, SRS, and PxCCH as control-related channels, and the BWP and ID configured in this way can be semi-statically or dynamically indicated by MAC CE or DCI. In a high layer such as DCI or RRC related to semi-persistent scheduling (SPS) or configuration authorization (e.g., CG authorization or SPS-DCI), a PxSCH-BWP, PxSCH-bandwidth partition, PxCCH-BWP / bandwidth partition, or PxCCH-partition can be pre-specified.

[0210] [Table 7]

[0211]

[0212] In the case where the BW of each channel for uplink is operated differently, a method of indicating the BW of each channel by offset may be considered. For example, if PRACH and PUSCH operate at 5 MHz and SRS operates at 20 MHz, the offset may be set based on a partition concept for BW rather than BWP.

[0213] - In the scheme where the uplink channel for SRS only operates 20MHz BW(P), the concept of XX_BWP can be introduced for the shared channel and PRACH, and the maximum bandwidth of the corresponding BWP is 5MHz. Here, XX_BWP is a dedicated BWP for the RACH process and can be called "RACH-BWP".

[0214] -Based on Figures 13 to 15 In a scheme where uplink channels of PUSCH, SRS, PRACH and PUCCH operate with a 5MHz BWP (or partition), only specific channels may be designated to use 5MHz starting from the starting RB of the maximum 20MHz BWP.

[0215] - The offset may be set in units of RBs. For example, the offset may be set in advance in a higher layer with a granularity of a resource block group (RBG). For PxSCH, the FDRA information and the granularity offset value may be indicated through DCI or MAC CE.

[0216] - The offset may be set in units of one of 4 equal partitioned bandwidths indicating 20 MHz. For example, SRS has an entire BW of 20 MHz but may be operated to use only a maximum of 5 MHz when transmitting one OFDM symbol.

[0217] - The offset list may be sent in advance in the RRC, and the index of the offset list may be sent dynamically through the DCI or semi-statically through the MAC CE. In another scheme, the offset list may be sent semi-statically through the MAC CE.

[0218] - The offset unit and / or name according to each channel may be configured differently according to the operation of the corresponding channel.

[0219] -In the case where the bandwidth of PUSCH or PDSCH is limited to 5MHz, the 5MHz bandwidth can be configured continuously or non-continuously. The method of configuring the bandwidth continuously is the same as the method of XX_BWP described above, and here, the uplink can be limited to a maximum of 5MHz BW (P) from the start. The method of configuring the bandwidth non-continuously can be understood as a method of reducing the soft buffer size considering the throughput (T-put) of 5MHz BW. In the case of performing repeated transmissions to expand the coverage, an offset can be set for 5MHz according to each time slot. In the case where the entire bandwidth exceeds 20MHz, it can be configured that the transmission is performed only by modulo operation at a maximum of 5MHz. Shared channels can be allocated by RA type 0 and RA type 1, which are two schemes for allocating RBs of frequency resources. RA type 0 is a scheme for allocating RBs based on a bitmap, and RA type 1 is a scheme for allocating RBs based on a resource indication value (RIV).

[0220] Fig.16 An example of a PxSCH allocation scheme in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.16 , the shared channel can be configured as a continuous BW of 5 MHz as in Case 1, or as a non-contiguous BW as in Case 2.

[0221] The bitmap-based RA type 0 may be configured such that among the available RBGs, the total RBG size (which is the sum of the BWs of the RBGs with the FDRA bit arrangement value of 1) does not exceed 5MHz BW. According to an embodiment, the above scheme may be applied only to the downlink. Alternatively, the bitmap-based RA type 0 may be configured such that in the bitmap of the RBGs, there is no 0 between 1 and 1, 1 exists continuously, and thus the continuous 5MHz BW is configured as a shared channel, such as Fig.16 As shown in situation 1.

[0222] The total number of RBGs can be configured not to exceed the number of RBs for a 5MHz channel bandwidth defined in RAN4. Alternatively, the total number of RBGs can be defined based on the maximum number of RBs for the corresponding BW. For example, in the case of a 30KHz SCS, the total number of RBGs can be defined with 12 PRBs.

[0223] In the case of RA type 1 (i.e., interleaved type), the length of the localized RB (which is a resource block allocated continuously) is used only as much as the 5MHz RB. According to an embodiment, the scheme of mapping virtual resource blocks (VRBs) to physical resource blocks (PRBs) (VRB to PRB mapping) may not be applied to the uplink. In this case, the above offset may be replaced with the starting RB.

[0224] RIV-based RA type 1 may limit BWP of 5 MHz or less to be operated only in downlink or uplink for Redcap. However, the maximum length of LRB may be configured not to exceed the number of RBs within the 5 MHz channel bandwidth defined in RAN4 of Table 8. Alternatively, the maximum length of LRB may be redefined with the maximum number of RBs.

[0225] The following Table 8 shows the maximum number of available RBs according to bandwidth and subcarrier spacing (SCS).

[0226] [Table 8]

[0227]

[0228]

[0229] In the case where the BW(P) for the uplink is limited to 5 MHz, even if the RFIC can use 20 MHz, the SRS can be transmitted at a maximum of 5 MHz. However, since the SRS is also used for downlink channel analysis of TDD, transmission at a maximum of 20 MHz may be required. Fig.17 An example of an SRS transmission scheme in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.17 As shown, four consecutive OFDM symbols of the SRS may be controlled to be transmitted in different 5 MHz bandwidths 1711 , 1712 , 1713 , and 1714 within a limited 20 MHz 1710 .

[0230] Implementation #7 :Other implementations

[0231] - Embodiment 7-1: Not only MSG3 related information but also repetition information on PxSCH may be added to the spare bits of the FDRA field described in Embodiment #3. In this case, a fast response to coverage extension may be dynamically achieved.

[0232] - Implementation 7-2: In the case where multiple PxSCH-BWP / bandwidth partitions, PxCCH-BWP or multiple partitioned bandwidths for PDCCH, PUCCH, SRS and RACH are configured in the higher layer, one BWP can be set as the default and the remaining BWPs can be set to active or inactive. Here, only one PxSCH-BWP / bandwidth partition and one PxCCH-BWP / bandwidth partition can be set to active, and these can be specified by MAC CE or DCI. In this case, if they are scheduled for more than a predetermined time or have not been used for more than a predetermined time based on a specific timer, they can be specified to return to the default PxSCH or PxCCH-BWP. This is the same as the existing timer operation scheme for the BWP of each channel.

[0233] - A dedicated BWP for PUCCH and PDCCH may be set to 5 MHz or more according to channels.

[0234] - In case multiple PxCCH-BWP / bandwidth partitions and multiple PxSCH-BWP / bandwidth partitions are configured within a BWP, they may be switched. For this purpose, a switching gap may be defined. The switching gap may be set to 0, a predefined value, or a value set by a higher layer.

[0235] - For each of the various channels such as PRACH, PDCCH, PUCCH and SRS, multiple PxCCH-BWPs may be configured. PxCCH-BWP / Bandwidth partition may be understood to collectively refer to RACH-BWP, PDCCH-BWP, SRS-BWP or PUCCH-BWP.

[0236] - The active PxCCH-BWP / bandwidth partition for each channel of the PxCCH-BWP may be specified through MAC CE. For example, through MAC CE, the ID of the active PxCCH-BWP / bandwidth partition may be sent, or a bitmap indicating the PxCCH-BWP / bandwidth partition may be sent.

[0237] - The BWP / bandwidth partition of PxCCH-BWP / bandwidth partition and PxSCH-BWP / bandwidth partition may be referred to by using terms such as RB subset or contiguous RBG.

[0238] -When PxSCH is scheduled by using PDCCH, PDCCH and PxSCH should not be sent in the same time slot. This is because PDCCH and PxSCH have different BWPs, so buffering problems may occur in each time slot. Therefore, in the case of DCI1_X of PDSCH, a time slot gap indicating the difference between the time slot for sending PDCCH and the time slot for sending PxSCH may be added to the spare bit part of the FDRA field. Alternatively, the time slot gap may be predetermined in RRC as a higher layer, or semi-statically indicated in MAC CE. For example, MAC CE may be replaced with Fig.18 and Fig.19 The new DCI shown. In this case, the time domain resource allocation (TDRA) of the DCI can be applied from the time slot indicated by the gap. Alternatively, the transmission time slot of the PDCCH and the transmission time slot of the PDSCH can be predetermined in the high layer. In the case of TDD, it can only be transmitted through the downlink OFDM symbols within the D slot for downlink or the S slot as a special slot.

[0239] - A relaxation is required for the table defining default values ​​for K0 and K2 values ​​associated with existing TDRA. This is to avoid the situation where PDCCH and PxSCH are defined to be received in the same time slot.

[0240] - Implementation method 7-1: define a new table.

[0241] - Implementation 7-2: defining an additional delay for a specific time slot in an existing table.

[0242] - Implementation 7-3: For K0 and K1, a value greater than 1 is always specified.

[0243] Typically, PDCCH is used to schedule PxSCH. A PDCCH for notifying the PDCCH that schedules PxSCH may be newly designed. The newly designed new DCI may be called DCI X_X. The new DCI may include at least one of the following items: information related to the scheduling of the PDCCH that schedules PxSCH, and information about the time slot interval from the PDSCH scheduled by the PDCCH. In addition, the new PDCCH may include additional information related to the PDCCH for the wake-up signal (WUS) or the PDCCH for the paging early indication (PEI).

[0244] Fig.18 An example of an operation scheme of a new DCI in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.18, the new DCI 1810 may include information related to scheduling of the DCI 1820 that schedules the PDSCH 1830 (ie, the DCI 1820 for the shared channel), and information 1840 about a time slot interval between the DCI 1820 for the shared channel and the PDSCH 1830 scheduled by the DCI 1820.

[0245] The information 1840 about the time slot interval included in the new DCI 1810 may be continuously applied until the next new DCI 1810 is transmitted. That is, the information 1840 about the time slot interval included in the new DCI 1810 is continuously applied to the DCI 1820 for the shared channel transmitted after the new DCI 1810 is transmitted and the PDSCH 1830 scheduled by the DCI 1820. Fig.19 As shown, when another gap time slot is needed, a new DCI may be additionally sent.

[0246] Fig.19 An example of an operation scheme of a new DCI in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.19 , the new DCI 1910 may include information about a modified time slot interval between the DCI 1920 for the shared channel and the PDSCH 1930 scheduled by the DCI 1920 .

[0247] As described above, because the Redcap terminal uses a narrow bandwidth of 5MHz, some bits of the FDRA field based on the existing 100MHz configuration may not be used for resource allocation. Therefore, according to an embodiment of the present disclosure, the spare bits of the bits of the FDRA field that are not used for resource allocation can be used for additional control signaling. In addition, 5G NR does not use the 1 bit designated for the existing CSI request. Therefore, according to an embodiment of the present disclosure, the 1 bit designated for the existing CSI request can be used for additional control signaling.

[0248] In general call situations, the RACH process should meet the requirements for fast access performance in situations such as the initial access process or radio failure or handover situations. Various embodiments of the present disclosure enable the reception performance of MGS3 to be improved during the RACH process and to quickly handle various failures in radio connection situations. In addition, the call access rate can be improved. In addition, improvements in cost and power consumption can be obtained through an efficient operation scheme of the BWP of the PxCCH in the FDRA-related PxSCH.

[0249] Fig. 20 An example of a process of receiving a downlink signal in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig. 20 A method for operating a terminal is illustrated.

[0250] Reference Fig. 20 In step S2001, the terminal performs a random access procedure. Specifically, the terminal may obtain system information from the base station, send a random access preamble to the base station based on the random access related information obtained from the system information, and receive a random access response message from the base station. In addition, the terminal performs signaling for establishing a connection with the base station. Fig. 20 It is not illustrated in the figure, but before this step, the terminal can receive a synchronization signal block (SSB) including at least one synchronization signal through a synchronization cell search operation, and obtain synchronization with the base station based on the synchronization signal.

[0251] In step S2003, the terminal receives information related to resource allocation for downlink communication. The received information may include at least one of scheduling information and configuration information for performing communication, and at least one of physical layer signaling, MAC CE and high-level signaling. Based on the received information, the terminal identifies the allocated resources for downlink communication. For example, the received information may include information indicating a plurality of non-continuous resources in the frequency domain. Here, the sum of the RBs of the non-continuous plurality of resources may be equal to or less than the maximum number of RBs of the terminal. Here, the maximum number of RBs may be understood as the number of RBs corresponding to the restricted bandwidth configured for the terminal. For example, if the restricted bandwidth is 5MHz, the maximum number of RBs may be 28, 27 or 25 when using 15kHz SCS, or may be 14, 13, 12 or 11 when using 30kHz SCS.

[0252] In step S2007, the terminal receives a downlink signal. Specifically, the terminal receives the downlink signal based on the resource allocation included in the received information. For example, the terminal can receive the downlink signal through multiple resources allocated non-contiguously.

[0253] As reference Fig. 20 As described above, the terminal can receive a signal through the non-continuously allocated downlink resources. Here, according to other embodiments, the non-continuous allocation of resources can be applied not only to downlink communication, but also to uplink communication.

[0254] Fig.21 An example of a process of transmitting a downlink signal in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.21 A method for operating a base station is illustrated.

[0255] Reference Fig.21In step S2101, the base station performs a random access procedure. Specifically, the base station may receive a random access preamble code sent from the terminal in one of the RACH opportunities included in the RACH resources indicated by the system information, and send a random access response message to the terminal. In addition, the base station performs signaling for establishing a connection with the terminal. Although Fig.21 Not illustrated in the figure, but before this step, the base station can send an SSB including at least one synchronization signal.

[0256] In step S2103, the base station sends information related to resource allocation for downlink communication. The information sent may include at least one of scheduling information and configuration information for performing communication, and at least one of physical layer signaling, MAC CE, and high-level signaling. For example, the information sent may include information indicating multiple non-continuous resources in the frequency domain. Here, the sum of the RBs of the multiple non-continuous resources may be equal to or less than the maximum number of RBs of the terminal. Here, the maximum number of RBs may be understood as the number of RBs corresponding to the restricted bandwidth configured for the terminal. For example, if the restricted bandwidth is 5MHz, the maximum number of RBs may be 28, 27, or 25 when using 15kHz SCS, or may be 14, 13, 12, or 11 when using 30kHz SCS.

[0257] In step S2105, the base station sends a downlink signal. Specifically, the base station sends a downlink signal to the terminal based on the resource allocation indicated in the sent information. For example, the base station can send a downlink signal to the terminal through multiple resources allocated non-contiguously.

[0258] As reference Fig.21 As described above, the base station can send a signal through the allocated downlink resources. Here, according to other embodiments, the non-continuous allocation of resources can be applied not only to downlink communication but also to uplink communication.

[0259] Fig. 22 An example of a process of transmitting additional information using MSG2 of a random access procedure in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0260] Reference Fig. 22 In step S2001, the base station 2220 generates an uplink grant including additional information. According to an embodiment, the additional information may include at least one of the following items: information about the number of repetitions of MSG3, TBoMS related information, SRS request information, CSI request information, sequence initialization information of DMRS, information related to the modulation scheme of MSG3, and partitioned frequency band location information. According to an embodiment, the additional information may be included in a spare bit of the FDRA of the uplink grant or a CSI request bit of the uplink grant. For example, the additional information may be included in Fig. 9 The 27-bit uplink grant 920 may be in the spare bit portion of the FDRA field 1010 or the CSI request field 1030. According to an embodiment, the base station 2220 may be configured to design a new uplink grant having 27 bits or more and add additional information to the new uplink grant.

[0261] In step S2203, the base station 2220 sends MSG2 including the uplink grant to the terminal 2210. In other words, the base station 2220 sends a random access response, i.e., MSG2 including the uplink grant, to the terminal 2210. The uplink grant includes additional information.

[0262] Fig.23 An example of a process of exchanging terminal information by using a random access preamble in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0263] Reference Fig.23 , in step S2301, the base station 2320 sends system information. For example, the base station 2320 sends a master information block (MIB) and at least one system information block (SIB). Therefore, the base station 2320 sends the terminal 2310 the information required for the terminal 2310 to access the base station 2320 and the information for performing the communication process with the base station 2320. For example, the system information may include information indicating a RACH opportunity. Each of the RACH opportunities corresponds to a different resource having a bandwidth lower than a threshold bandwidth in the frequency domain. According to an embodiment, the base station 2320 may divide all frequency bands used for PRACH into a plurality of bandwidths, and send system information indicating that each of the plurality of divided bandwidths corresponds to a different RACH opportunity to the terminal 2310. According to an embodiment, the base station 2320 may configure a separate initial UL BWP that the terminal can initially use for narrowband services, divide the separate initial UL BWP into a plurality of sub-BWPs, and send system information indicating that each sub-BWP corresponds to a different RACH opportunity to the terminal 2310. Here, the base station 2320 may specify at least one piece of terminal capability information for each separate initial sub-UL BWP. For example, the base station 2320 may map whether the CE function is supported, whether the TBoMS function is supported, and / or one of a plurality of types of terminals to each RACH opportunity or sub-BWP.

[0264] In step S2303, the terminal 2310 sends a RACH preamble. The terminal 2310 selects one of the RACH opportunities included in the RACH resources indicated by the system information, and sends the RACH preamble in the selected RACH opportunity. According to an embodiment, the terminal 2310 can identify the capability information mapped to each of the RACH opportunities, and select the RACH opportunity based on the capability information. That is, the terminal 2310 can select the RACH opportunity corresponding to its capability information among the RACH opportunities. For example, in the case where the terminal supports the CE function, the PRACH transmission can start in the RACH opportunity of the separate initial sub-UL BWP to which the CE function is mapped, and in the case where the terminal supports both the CE function and the TBoMS function, the PRACH transmission can start in the RACH opportunity of the separate initial sub-UL BWP to which the CE function and the TBoMS function are mapped.

[0265] In step S2305, the base station 2320 identifies the capability information of the terminal based on the RACH opportunity of receiving the RACH preamble. In other words, the base station 2320 can identify the functions supported by the terminal based on the RACH opportunity of receiving the RACH preamble. For example, in the case where the RACH preamble is received in the RACH opportunity of the separate initial sub-UL BWP to which the CE function is mapped, the base station 2320 can identify that the terminal supports the CE function. In the case where the RACH preamble is received in the RACH opportunity of the separate initial sub-UL BWP to which the CE function and the TBoMS function are mapped, the base station 2320 can identify that the terminal supports both the CE function and the TBoMS function.

[0266] In reference Fig.23 In the description of Fig. 22 process.

[0267] Fig.24 An example of a process of transmitting additional information by using MSG3 of a random access procedure in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0268] Reference Fig.24 , in step S2401, the terminal 2410 generates MSG3 including additional information. In other words, the terminal 2410 may include additional information in addition to existing information in MSG3, and send MSG3 to the base station through PUSCH. For example, the additional information may include at least one of the following items: whether HD-FDD is performed, antenna or MIMO information, appearance information, feature information of BWP, information on whether CE and TBoMS functions are supported, or device type information.

[0269] In step S2403, the terminal 2410 transmits MSG3 including the additional information to the base station 2420. Then, the terminal 2410 and the base station 2420 may perform a process for establishing a connection. In addition, the terminal 2410 and the base station 2420 may perform communication based on the additional information.

[0270] Fig.25 An example of a process of indicating bandwidth in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.25 The described process can be understood as part of the random access process.

[0271] Reference Fig.25 , in step S2501, the base station 2520 generates offset information for a specific channel bandwidth. The base station 2520 can operate the uplink and downlink with different bandwidth sizes. For example, the bandwidth of the uplink can be operated as an existing 20MHz operation, and the bandwidth of the downlink can be operated as a partial band of 20MHz (e.g., 5MHz or less). Therefore, based on the uplink channel bandwidth, the base station 2520 can generate offset information indicating the downlink channel bandwidth allocated to the terminal 2510. The offset can be set in units of RBs, or in units indicating one of the divided bandwidths. Alternatively, it can be represented by an index in a preset offset list.

[0272] In step S2503, the base station 2520 sends the offset information to the terminal 2510. The base station 2520 may send the offset information to the terminal 2510 by using the spare bits of FDRA or other additional bits.

[0273] In step S2505 , the terminal 2510 identifies the allocated bandwidth based on the offset information. The terminal 2510 may obtain bandwidth information for a specific channel based on the offset information received from the base station 2520 .

[0274] In reference Fig.25 In the description of , it is assumed that the downlink bandwidth is smaller than the uplink bandwidth, but refer to Fig.25 The bandwidth indication process example described can also be applied in the opposite case. For example, Fig.25 The bandwidth indication process can also be applied to the case where the uplink bandwidth is smaller than the downlink bandwidth.

[0275] The example of the above-mentioned proposed method may be included as one of the implementation methods of the present disclosure, and thus may be regarded as a type of the proposed method. In addition, the above-mentioned proposed method may be implemented independently, or some of the proposed methods may be combined (or merged). The rule may be defined so that the base station notifies the UE of information on whether to apply the proposed method (or information about the rule of the proposed method) through a predefined signal (e.g., a physical layer signal or a high layer signal).

[0276] Those skilled in the art will appreciate that the present disclosure can be implemented in other specific ways than those described herein without departing from the spirit and essential characteristics of the present disclosure. Therefore, the above exemplary embodiments should be interpreted in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents, rather than by the above description, and it is intended that all changes that come within the meaning and equivalent range of the appended claims are covered therein. In addition, it will be apparent that some claims that refer to specific claims can be combined with another claim that refers to other claims other than the specific claims to constitute an embodiment, or new claims can be added by amendment after the application is submitted.

[0277] Industrial Applicability

[0278] Embodiments of the present disclosure are applicable to various radio access systems. Examples of various radio access systems include the 3rd Generation Partnership Project (3GPP) or 3GPP2 system.

[0279] The embodiments of the present disclosure are applicable not only to various radio access systems but also to all technical fields to which various radio access systems are applied. In addition, the proposed method is applicable to millimeter wave and terahertz wave communication systems using ultra-high frequency bands.

[0280] Additionally, embodiments of the present disclosure are applicable to a variety of applications, such as autonomous vehicles, drones, and the like.

Claims

1. A method for operating a terminal in a wireless communication system, the method comprising the following steps: performing a random access procedure; receiving information related to resource allocation for downlink communications; as well as receiving a downlink signal based on the resource allocation, The resource allocation is a plurality of non-continuous resources in the frequency domain, and the sum of resource blocks RB of the plurality of resources is equal to or less than the maximum number of RBs of the terminal.

2. The method according to claim 1, wherein: The maximum number of RBs includes a number of RBs corresponding to a limited bandwidth configured for the terminal.

3. The method according to claim 1, wherein: The number of RBs corresponding to the limited bandwidth is included.

4. The method according to claim 1, wherein: The steps of performing the random access procedure include: receiving a random access response RAR message, the RAR message including a FDRA field, the FDRA field including additional information, and The additional information includes at least one of the following items: information about the number of repetitions of message-3MSG3, information related to TB processing TBoMS on multi-slot PUSCH, sounding reference signal SRS request, channel state information CSI request, information related to sequence initialization of demodulation reference signal DMRS, information related to the waveform of MSG3, and information indicating the frequency band allocated to the shared channel within the channel bandwidth.

5. The method according to claim 1, wherein: The step of performing the random access procedure includes: receiving a random access response RAR message, the RAR message including a CSI request field, the CSI request field including additional information, and The additional information includes at least one of the following items: information about the number of repetitions of MSG3, information related to TBoMS, SRS request, information related to sequence initialization of DMRS, information related to the waveform of MSG3, and information indicating the frequency band allocated to the shared channel within the channel bandwidth.

6. The method according to claim 1, wherein: The steps of performing the random access procedure include: receiving a random access response RAR message, the RAR message including an uplink grant, and The uplink authorization includes at least one of the following items: information related to the uplink beam, information related to TBoMS, SRS request, information related to the sequence initialization of DMRS, information related to the waveform of MSG3, and information indicating the frequency band allocated to the shared channel within the channel bandwidth.

7. The method according to claim 1, wherein: The step of performing the random access procedure includes: sending a random access preamble code through a random access channel RACH opportunity configured for the terminal to indicate the use of limited bandwidth.

8. The method according to claim 1, wherein: The step of performing the random access procedure includes sending a random access preamble code through an initial bandwidth part BWP configured for a device using a limited bandwidth.

9. The method according to claim 8, wherein: The initial BWP includes a plurality of sub-BWPs, and The sub-BWP is selectively used according to the type or capability information of the device that sends the random access preamble code.

10. The method according to claim 1, wherein: The step of performing the random access process includes: sending MSG3, wherein the MSG3 includes at least one of the following items: information on whether half-duplex HD-frequency division duplex FDD is supported, information related to the antenna, information related to the form factor type, information related to the BWP of the terminal, information on whether coverage enhancement CE is supported, and information on whether TBoMS function is supported.

11. The method according to claim 1, further comprising the steps of: Based on the uplink bandwidth being smaller than the downlink bandwidth, information related to an offset with respect to the downlink frequency band is received for indicating a position of the uplink frequency band.

12. The method according to claim 11, wherein: The information related to the offset is included in an FDRA field of a random access response received during the random access procedure.

13. A method for operating a base station in a wireless communication system, the method comprising the steps of: performing a random access procedure; transmitting information related to resource allocation for downlink communications; as well as sending a downlink signal to the terminal based on the resource allocation, The resource allocation is a plurality of non-continuous resources in the frequency domain, and the sum of resource blocks RB of the plurality of resources is equal to or less than the maximum number of RBs of the terminal.

14. A terminal in a wireless communication system, the terminal comprising: Transceiver; as well as a processor coupled to the transceiver, Wherein, the processor is configured to: Perform a random access procedure, receiving information related to resource allocation for downlink communications, and receiving a downlink signal based on the resource allocation, The resource allocation is a plurality of non-continuous resources in the frequency domain, and the sum of resource blocks RB of the plurality of resources is equal to or less than the maximum number of RBs of the terminal.

15. A base station in a wireless communication system, the base station comprising: Transceiver; as well as a processor coupled to the transceiver, Wherein, the processor is configured to: Perform a random access procedure, transmitting information related to resource allocation for downlink communications, and sending a downlink signal to the terminal based on the resource allocation, The resource allocation is a plurality of non-continuous resources in the frequency domain, and the sum of resource blocks RB of the plurality of resources is equal to or less than the maximum number of RBs of the terminal.

16. A communication device, comprising: at least one processor; as well as at least one computer memory coupled to the at least one processor and storing instructions that, when executed by the at least one processor, indicate operations, The operations include: Perform a random access procedure, receiving information related to resource allocation for downlink communications, and receiving a downlink signal based on the resource allocation, The resource allocation is a plurality of non-continuous resources in the frequency domain, and the sum of resource blocks RB of the plurality of resources is equal to or less than the maximum number of RBs of the terminal.

17. A non-transitory computer-readable medium storing at least one instruction, the non-transitory computer-readable medium including the at least one instruction executable by a processor, in, The at least one instruction controls the device to: Perform a random access procedure, receiving information related to resource allocation for downlink communications, and receiving a downlink signal based on the resource allocation, The resource allocation is a plurality of non-continuous resources in the frequency domain, and the sum of resource blocks RB of the plurality of resources is equal to or less than the maximum number of RBs of the terminal.

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