Method and apparatus for supporting random access by using subband full duplex in next-generation mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a UE in a wireless communication system, according to an embodiment of the present disclosure, comprises the steps of: receiving, from a base station, a system information block 1 (SIB1) comprising time division duplex (TDD) resource configuration information comprising subband full duplex (SBFD) resource configuration information, and random access channel (RACH) configuration information related to SBFD; and performing a random access procedure with the base station, on the basis of the SBFD resource configuration information and the RACH configuration information related to the SBFD, wherein the RACH configuration information related to the SBFD is related to any one of a single RACH configuration and an additional RACH configuration.

Description

Method and device for supporting random access using subbundant full duplex in next-generation mobile communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. More specifically, the present disclosure relates to a method and device for performing random access using subband full duplex.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band, such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave), such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and meet performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] When such 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] The present disclosure proposes a method for a terminal to perform random access to a cell in which conditional Subband Full Duplex (SBFD; partial band duplex communication) is configured. More specifically, a method is proposed to support random access in the RRC connected state, IDLE state, and INACTIVE state.

[0009] To solve the above-described problems, the present invention proposes a method performed by a terminal in a wireless communication system. More specifically, the method comprises the steps of: receiving, from a base station, a system information block (SIB 1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD; and performing a random access procedure with the base station based on the SBFD resource configuration information and the RACH configuration information related to the SBFD, wherein the RACH configuration information related to the SBFD is characterized in that it relates to either a Single RACH configuration or an additional RACH configuration.

[0010] In order to solve the above problems, the present invention proposes a method performed by a base station in a wireless communication system. More specifically, the method comprises the steps of: transmitting, to a terminal, a System Information Block 1 (SIB1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD; and performing a random access procedure with the base station based on the SBFD resource configuration information and the RACH configuration information related to the SBFD, wherein the RACH configuration information related to the SBFD is characterized in that it relates to either a Single RACH configuration or an additional RACH configuration.

[0011] In order to solve the above problems, the present invention proposes a terminal in a wireless communication system. More specifically, the terminal includes a transceiver for transmitting and receiving a signal; and a control unit connected to the transceiver, wherein the control unit receives, from a base station, a system information block (SIB 1, SIB1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD, and performs a random access procedure with the base station based on the SBFD resource configuration information and the RACH configuration information related to the SBFD, wherein the RACH configuration information related to the SBFD is characterized in that it is related to either a Single RACH configuration or an additional RACH configuration.

[0012] In order to solve the above problems, the present invention proposes a base station in a wireless communication system. More specifically, the terminal includes a transceiver for transmitting and receiving a signal; and a control unit connected to the transceiver, wherein the control unit transmits, to the terminal, a system information block (SIB 1, SIB1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD, and performs a random access procedure with the base station based on the SBFD resource configuration information and the RACH configuration information related to the SBFD, wherein the RACH configuration information related to the SBFD is characterized in that it is related to either a Single RACH configuration or an additional RACH configuration.

[0013] Since the SBFD terminal proposed in this disclosure performs random access operations using SBFD resources in a cell that supports SBFD, latency can be significantly reduced during random access to that cell. Furthermore, random access can be performed with low power consumption, and interference impacts on adjacent cells and terminals can be reduced.

[0014] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system to which the present disclosure is applied.

[0015] FIG. 1b is a diagram showing a wireless protocol structure of a next-generation mobile communication system to which the present disclosure can be applied.

[0016] FIG. 1c is a diagram for explaining the subband full duplex (SBFD) concept of a base station or cell according to one embodiment of the present disclosure.

[0017] FIG. 1D is a diagram illustrating a method for providing random access settings in a subband full duplex (SBFD) of a base station or cell according to one embodiment of the present disclosure.

[0018] FIG. 1e is a diagram illustrating a method for a terminal supporting SBFD in an RRC IDLE state according to an embodiment of the present disclosure to perform an initial connection procedure to a cell supporting SBFD.

[0019] FIG. 1f is a diagram illustrating a method for a terminal supporting SBFD in an RRC INACTIVE state to perform an RRC Resume procedure to a cell supporting SBFD according to an embodiment of the present disclosure.

[0020] FIG. 1g is a diagram illustrating a method for a terminal supporting SBFD in an RRC connection state to perform a handover to a cell supporting SBFD according to an embodiment of the present disclosure.

[0021] FIG. 1h is a diagram illustrating a method in which a terminal supporting SBFD in an RRC connection state performs random access by receiving a PDCCH order from a cell according to an embodiment of the present disclosure.

[0022] FIG. 1i is a diagram illustrating a method for a terminal supporting SBFD in an RRC connection state to perform random access in a beam failure recovery procedure after performing beam failure detection from a cell according to an embodiment of the present disclosure.

[0023] FIG. 1J is a diagram illustrating the operation of a terminal performing random access using SBFD resources according to one embodiment of the present disclosure.

[0024] FIG. 1k is a diagram illustrating the operation of a base station according to one embodiment of the present disclosure.

[0025] FIG. 1l is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0026] FIG. 1m is a block diagram illustrating a configuration of a base station according to one embodiment of the present disclosure.

[0027] In describing the embodiments herein, descriptions of technical details that are well-known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to avoid obscuring the gist of the present invention by omitting unnecessary explanations and to convey the gist more clearly.

[0028] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0029] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0030] At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagrams can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flow diagram block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flow diagram block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0031] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0032] Here, the term '~ unit' used in the present embodiment means a software or hardware component such as an FPGA or ASIC, and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to play one or more processors. Accordingly, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. Additionally, components and '~parts' may be implemented to regenerate one or more CPUs within a device or secure multimedia card.

[0033] Hereinafter, the operating principles of the present invention will be described in detail with reference to the attached drawings. In the following description of the present invention, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present invention, and these may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout this specification. Terms used in the following description, such as terms for identifying connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, and terms referring to various identification information, are examples for the convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0034] For convenience of explanation, the present invention uses terms and names defined in the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard. However, the present invention is not limited to these terms and names and can be equally applied to systems conforming to other standards.

[0035] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system to which the present disclosure is applied.

[0036] Referring to FIG. 1a, as illustrated, the wireless access network of the next-generation mobile communication system is composed of a next-generation base station (New Radio Node B, hereinafter referred to as NR NB, 1a-10) and a New Radio Core Network (NR CN, or NG CN: Next Generation Core Network, 1a-05). A user terminal (New Radio User Equipment, hereinafter referred to as NR UE or terminal, 1a-15) can access an external network through the NR NB (1a-10) and the NR CN (1a-05).

[0037] In Fig. 1a, the NR NB (1a-10) may correspond to the eNB (Evolved Node B) of the existing LTE system. The NR NB is connected to the NR UE (1a-15) via a wireless channel and can provide a service superior to that of the existing Node B. In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device is required that collects status information such as the buffer status of UEs, available transmission power status, and channel status, and performs scheduling, and the NR NB (1a-10) is responsible for this.

[0038] A single NR NB can typically control multiple cells. To achieve ultra-high-speed data transmission compared to existing LTE, it can exceed the existing maximum bandwidth and utilize Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology, with additional beamforming technology incorporated.

[0039] Additionally, an adaptive modulation and coding (AMC) method can be applied, which determines the modulation scheme and channel coding rate according to the channel status of the terminal.

[0040] The NR CN (1a-05) can perform functions such as mobility support, bearer setup, and Quality of Service (QoS) configuration. The NR CN is a device responsible for various control functions as well as mobility management for terminals and is connected to multiple base stations. Furthermore, the next-generation mobile communication system can also be interoperable with the existing LTE system, and the NR CN is connected to the MME (1a-25) via a network interface. The MME is connected to the existing base station, the eNB (1a-30).

[0041] FIG. 1b is a diagram showing a wireless protocol structure of a next-generation mobile communication system to which the present disclosure can be applied.

[0042] Referring to FIG. 1b, the wireless protocol of the next-generation mobile communication system is composed of NR SDAP (NR service data adaptation protocol, 1b-01, 1b-45), NR PDCP (NR packet data convergence protocol, 1b-05, 1b-40), NR RLC (NR radio link control, 1b-10, 1b-35), and NR MAC (NR medium access control, 1b-15, 1b-30) in the terminal and the new radio (NR) base station, respectively.

[0043] Key features of NR SDAP (1b-01, 1b-45) may include some of the following:

[0044] Transfer of user plane data

[0045] Mapping between a QoS flow and a DRB for both DL and UL

[0046] Marking QoS flow ID in both DL and UL packets

[0047] Ability to map relective QoS flow to data bearer for the UL SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0048] For the above SDAP layer device, the terminal can be configured by RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can be instructed to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink with the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0049] The main functions of NR PDCP (1b-05, 1b-40) may include some of the following functions:

[0050] ● Header compression and decompression (ROHC only)

[0051] ● User data transfer function

[0052] ● In-sequence delivery of upper layer PDUs

[0053] ● Out-of-sequence delivery of upper layer PDUs

[0054] ● Reordering function (PDCP PDU reordering for reception)

[0055] ● Duplicate detection of lower layer SDUs

[0056] ● Retransmission function (Retransmission of PDCP SDUs)

[0057] ● Encryption and decryption functions (Ciphering and deciphering)

[0058] ● Timer-based SDU discard in uplink

[0059] The reordering function of the NR PDCP device above refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order, or may include a function of transmitting data directly without considering the order, may include a function of recording lost PDCP PDUs by reordering the order, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0060] The main functions of NR RLC (1b-10, 1b-35) may include some of the following functions:

[0061] ● Data transfer function (Transfer of upper layer PDUs)

[0062] ● In-sequence delivery of upper layer PDUs

[0063] ● Out-of-sequence delivery of upper layer PDUs

[0064] ● ARQ function (Error Correction through ARQ)

[0065] ● Concatenation, segmentation and reassembly of RLC SDUs

[0066] ● Re-segmentation of RLC data PDUs

[0067] ● Reordering of RLC data PDUs

[0068] ● Duplicate detection function

[0069] ● Error detection function (Protocol error detection)

[0070] ● RLC SDU discard function

[0071] ● RLC re-establishment function

[0072] The in-sequence delivery function of the NR RLC device above refers to the function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer, and may include a function of reassembling and transmitting RLC SDUs when an RLC SDU is originally received divided into multiple RLC SDUs, may include a function of reordering received RLC PDUs based on RLC SN (sequence number) or PDCP SN (sequence number), may include a function of recording lost RLC PDUs by reordering the sequence, may include a function of reporting the status of lost RLC PDUs to the transmitting side, may include a function of requesting retransmission of lost RLC PDUs, may include a function of sequentially transmitting only RLC SDUs up to the lost RLC SDU to an upper layer when there is a lost RLC SDU, or may include a function of sequentially transmitting all RLC SDUs received before the timer starts when a predetermined timer expires even when there is a lost RLC SDU. Or, even if there are lost RLC SDUs, if a predetermined timer has expired, it may include a function to sequentially deliver all RLC SDUs received up to the upper layer. In addition, the RLC PDUs may be processed in the order they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of sequence (out-of-sequence delivery). In the case of segments, the segments stored in the buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and then delivered to the PDCP device.The above NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

[0073] The out-of-sequence delivery function of the NR RLC device above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when an original RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of received RLC PDUs and arranging the order to record lost RLC PDUs.

[0074] NR MAC (1b-15, 1b-30) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0075] ● Mapping function (Mapping between logical channels and transport channels)

[0076] ● Multiplexing / demultiplexing of MAC SDUs

[0077] ● Scheduling information reporting function

[0078] ● HARQ function (Error correction through HARQ)

[0079] ● Priority handling between logical channels of one UE

[0080] ● Priority handling between UEs by means of dynamic scheduling

[0081] ● MBMS service identification function

[0082] ● Transport format selection function

[0083] ● Padding function

[0084] The NR PHY layer (1b-20, 1b-25) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it over a wireless channel, or demodulating and channel decoding OFDM symbols received over a wireless channel and transmitting them to a higher layer.

[0085] FIG. 1c is a diagram for explaining the subband full duplex (SBFD) concept of a base station or cell according to one embodiment of the present disclosure.

[0086] Referring to FIG. 1c, a base station (1c-05) performs wireless communication (1c-15) with a terminal (1c-20), and for this purpose, determines frequency and time resources (1c-15) and can allocate (schedul) downlink (DL) and uplink (UL) resources to the terminal within the resources. SBFD is basically an operation in a cell that supports TDD (Time Division Duplex), and the following embodiment assumes and explains operation in a TDD cell.

[0087] The resource (1c-15) allocated to the conventional terminal could be configured as one of the downlink slot (1c-25), the uplink slot (1c-45), and a flexible or special slot allocated when changing the downlink / uplink direction. Meanwhile, with the introduction of SBFD, it became possible to set SBFD slots (1c-30, 1c-35, 1c-40) where downlink and uplink resources are mixed between the base station and the terminal that can use SBFD. The SBFD slots (1c-30, 1c-35, 1c-40) can be set not only in the same positions as in FIG. 1c, but can also be set in any slot that the base station wants to set, such as the downlink slot of 1c-25.

[0088] In this situation, in order to support random access of the terminal, the base station can allocate an uplink physical layer Random Access Channel (PRACH) capable of transmitting and receiving a preamble for random access even in the SBFD slot instead of the existing uplink slot (1c-45), and can allocate a RACH occasion (RO) (1c-50). The SBFD RO may be included in the SBFD slot as shown in FIG. 1c, may exist across one or more SBFD slots, and may exist across not only one or more SBFD slots but also the normal Uplink slot (1c-45).

[0089] Through these SBFD ROs (1c-50), terminals capable of using SBFD gain additional RO opportunities in addition to the existing legacy RO, thereby enabling random access with even less delay and collision.

[0090] As described above, a base station or cell supporting SBFD can support random access using SBFD resources depending on the RRC connection status of a terminal, and for this purpose, a physical layer Random Access Channel (PRACH) must be allocated and an RACH occasion (RO) must be allocated. In particular, the present invention proposes a method by which all terminals in RRC IDLE, RRC INACTIVE, and RRC CONNECTED states can perform random access using SBFD resources. In particular, the present invention is characterized by proposing a method for providing RRC configuration information and a terminal operation for this. In addition, a terminal supporting SBFD according to an embodiment of the present disclosure may be referred to as an SBFD aware UE, an SBFD capable UE, etc.

[0091] FIG. 1D is a diagram illustrating a method for providing random access settings in a subband full duplex (SBFD) of a base station or cell according to one embodiment of the present disclosure.

[0092] Basically, TDD cells and base stations that support SBFD can operate TDD patterns and semi-static TDD configurations (tdd-UL-DL-ConfigCommon) through system information (SI) (e.g., system information block 1, SIB1), and can transmit DL / UL / flexible symbol resource configurations (config) for each slot and each symbol within the slot. In addition, each terminal can additionally indicate a given flexible symbol as DL or UL through configuration and downlink control information (DCI) signaling. Through DCI signaling, the DL / UL configurations for each terminal can be set differently on a symbol-by-symbol basis. In this way, adaptive scheduling of UL / DL traffic can be performed for each terminal / cell, and in the case of UL, coverage extension can be achieved.

[0093] When a duplexing method called subband full duplex (SBFD) is additionally introduced to these TDD resource configurations, the UL subband and DL subband frequency ranges can be designated separately for DL ​​or flexible slots or symbols. Accordingly, for a single SBFD symbol, UL resources can be allocated to a specific terminal in the UL subband, and DL resources can be allocated to a different terminal in the DL subband.

[0094] SBFD resource configuration can also be provided through SIB1, similar to TDD pattern configuration. That is, a TDD cell and base station supporting SBFD can provide the TDD configuration (TDD config) and SBFD configuration (SBFD config) provided by the cell in SIB1, and together with this, can provide RACH (random access channel) configuration that allows a terminal supporting SBFD to perform random access through SBFD resources when performing random access in the cell. In this case, the following two methods for RACH configuration using SBFD resources are possible.

[0095] - Method 1; (A) Single RACH configuration including SBFD RACH configuration: RACH configuration information using SBFD resources can be transmitted by including it in the random access configuration for existing terminals. In other words, the RACH configuration (RACH-ConfigCommon) provided in the existing SIB1 can be configured to include random access configurations for both existing terminals and SBFD terminals.

[0096] - Second method; (B) Two separate RACH configurations (one additional RACH configuration for SBFD): In addition to the random access configuration for existing terminals, RACH configuration information using SBFD resources for terminals supporting SBFD can be exclusively transmitted. That is, in addition to the RACH configuration (RACH-ConfigCommon) provided in the existing SIB1, a new RACH configuration IE (e.g., RACH-ConfigCommonSBFD) can be configured to include the random access configuration for SBFD terminals.

[0097] Additionally, if a terminal supporting SBFD supports random access using SBFD resources differently depending on the RRC connection state, that is, whether to support random access used in the initial RRC connection procedure in RRC IDLE / INACTIVE (random access using SBFD resources in the RRC connection state is applied by default), an additional indicator may be transmitted in SIB1 to indicate.

[0098] When the second method described above is applied, the corresponding indicator may be omitted. On the other hand, when the first method is used, since it is difficult for the UE to explicitly know whether the RACH configuration provided by the corresponding cell allows SBFD random access, an indicator that explicitly indicates whether to support the random access used in the initial RRC connection procedure may be effective. That is, the indicator may indicate whether the SIB1 random access configuration in the cell supports both "connected mode" or "connected mode and IDLE / INACTIVE mode." To this end, it is necessary to share the support for SBFD mode and the related settings for SBFD random access through inter-node messages (or Xn / F1 interface messages) between base stations or between base station CUs and DUs. The corresponding signaling may be omitted within the same CU.

[0099] Specifically, the first and second methods of RACH setup using SBFD resources are explained through drawings.

[0100] First, in the case of the first method (A: Single RACH configuration including SBFD RACH configuration), a RACH configuration including an SBFD RO (random access occasion) can be transmitted in slots (1d-10 to 1d-20) in which SBFD resources are set, excluding the DU slot (1d-05) for the legacy UE, and in the UL slot (1d-25) of the legacy UE. If the UE receiving the RACH configuration is a legacy UE, only the RO existing in the UL slot (1d-25) in the corresponding RO is determined to be a valid RO and used for random access. On the other hand, if the UE receiving the RACH configuration is a UE that supports SBFD, both the slots (1d-10 to 1d-20) in which SBFD resources are set and the RO set in the UL slot (1d-25) of the legacy UE can be determined to be a valid RO and used for random access.

[0101] Meanwhile, in the case of the second method (B: Two separate RACH configurations (one additional RACH configuration for SBFD)), an RO (1d-60) for an existing terminal that does not support SBFD may be provided in a RACH configuration for the existing terminal, and an RO (1d-65) for a terminal that supports SBFD may be provided in a separate SBFD RACH configuration. In both ROs, an RO (random access occasion) may be set in slots (1d-40 to 1d-50) in which SBFD resources are set, excluding a DU slot (1d-35), and in a UL slot (1d-55) of the existing terminal, and when the terminal that receives this is an existing terminal, only the RO existing in the UL slot (1d-55) among the existing ROs (1d-60) is determined as a valid RO and used for random access. Meanwhile, if the terminal receiving this is a terminal that supports SBFD, among the SBFD ROs (1d-65), both the slots (1d-40 to 1d-50) in which SBFD resources are set and the RO set in the UL slot (1d-55) of the existing terminal are judged as valid ROs and can be used during random access.

[0102] For reference, in the present invention, an RO existing in a flexible slot is also considered invalid, and the RO operates based on the TDD slot configuration and SBFD UL / DL resource configuration.

[0103] In addition, the RACH settings for existing terminals and the RACH settings for SBFD terminals may need to be reduced in transmission power when using SBFD resources because the target terminals are different and SBFD generally needs to reduce the interference effect on other terminals rather than being used in the same situation as a general terminal. In other words, even in random access using SBFD resources, the random access internal parameters may need to be set differently.

[0104] For example, the number of random access preamble transmissions, the random access response window length, and the power increase during power ramping can be signaled separately for SBFD purposes. In addition, if other parameters require differentiation for SBFD purposes, they can be signaled separately. In the case of the SBFD RACH first configuration, differentiation can be achieved by introducing new parameters as shown in Table 1 below.

[0105]

[0106] In the case of the SBFD RACH second configuration, since a separate RACH configuration is provided exclusively for SBFD, there may be no need to introduce new parameters since the configuration is done with parameters within the RACH-ConfigGeneric IE referenced within the configuration. That is, a new configuration such as rach-ConfigCommonSBFD-r19 in [Table 2] below can be introduced and applied to the SBFD terminal.

[0107]

[0108]

[0109] In addition, the RSRP threshold that the SBFD terminal sets to apply the SBFD random access setting can also be separately configured. That is, the terminal can apply SBFD random access if the signal strength is sufficiently high (received signal strength > threshold) by comparing the received SSB signal strength with the preset SSB RSRP threshold.

[0110] FIG. 1e is a diagram illustrating a method for a terminal supporting SBFD in an RRC IDLE state according to an embodiment of the present disclosure to perform an initial connection procedure to a cell supporting SBFD.

[0111] This embodiment is explained based on the contents of the drawings 1c and 1d above, and the related contents refer to the above description.

[0112] First, the entire operation of Embodiment 1 will be described. A terminal (1e-05) in an RRC IDLE state can camp on cell 1 (1e-10) and receive system information from the cell. In particular, at step 1e-15, the terminal (1e-05) can receive system information block 1 (SIB1) from cell 1 (1e-10). At least one of a slot configuration of a semi-static uplink / downlink (UL / DL) resource in TDD, a slot configuration of an SBFD resource in the UL / DL, and a random access configuration for the SBFD UE and the legacy UE (RACH configuration for the legacy UE and the SBFD UE) can be transmitted in the SIB1. For detailed configuration information, refer to the description in FIGS. 1c and 1d above.

[0113] In Fig. 1e-20, the terminal (1e-05) applies the settings in SIB1 received from cell 1 (1e-10), and can confirm the random access operation by combining the SBFD resource configuration information and the random access configuration. Basically, the SBFD resource usage and random access operation can be applied while following the operation of the UL / DL resource slot in TDD broadcasted in SIB1.

[0114] For example, if the TDD resource configuration and the SBFD resource configuration match, the terminal (1e-05) performs PDCCH monitoring operation on the DL resources in the corresponding SBFD slot and the DL resources in the non-SBFD slot. Then, it performs uplink transmission on the UL resources in the corresponding SBFD slot and the UL resources in the non-SBFD slot.

[0115] At step 1e-25 of FIG. 1, the terminal (1e-05) may perform random access preamble transmission based on SBFD random access configuration information in SIB1 received from cell 1 (1e-10). The random access procedure may be a CBRA (contention-based random access) operation based on SBFD configuration.

[0116] At step 1e-30, the terminal (1e-05) receives a random access response (RAR) message from cell 1 (1e-10). The corresponding operation 7 is also based on the SBFD setting received from SIB1.

[0117] At step 1e-35, the terminal (1e-05) can apply the received RAR information (e.g., timing advance (TA), UL grant, Temporary C-RNTI) and transmit an RRCSetupRequest message to cell 1 (1e-10).

[0118] At step 1e-40, the terminal (1e-05) can receive an RRCSetup message in response to the RRCSetupRequest message transmitted from cell 1 (1e-10).

[0119] At step 1e-45, the terminal (1e-05) can transmit an RRCSetupComplete message to cell 1 (1e-10) and transition to an RRC connected state.

[0120] Thereafter, in step 1e-50, the serving cell (1e-10) may transmit RRC configuration information to the terminal, and the RRC configuration information may include SBFD-related resources and SBFD random access settings. This is a setting for supporting SBFD in an RRC connected state, and may be the same as the setting transmitted in SIB1 in step 1e-15, or may be a different setting.

[0121] For example, SBFD resource configuration information may be semi-static for a cell, in which case it may be identical to the configuration in SIB1. Meanwhile, in the case of SBFD RACH configuration, there may be differences because the SBFD RACH configuration for a terminal in an RRC IDLE state may be different from the SBFD RACH configuration for a terminal in an RRC connected state.

[0122] In step 1e-55, the serving cell (1e-10) determines UL / DL scheduling based on TDD resource information and SBFD resource settings set for the terminal, and in step 1e-60, can transmit signaling (DCI; downlink control information) including the scheduling.

[0123] At step 1e-65, the terminal (1e-01) can perform downlink physical downlink shared channel (PDSCH) reception and uplink physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission according to the indicated scheduling information.

[0124] FIG. 1f is a diagram illustrating a method for a terminal supporting SBFD in an RRC INACTIVE state to perform an RRC Resume procedure to a cell supporting SBFD according to another embodiment of the present disclosure.

[0125] This embodiment is explained based on the contents of the drawings 1c and 1d above, and the related contents refer to the above description.

[0126] First, to explain the overall operation of Example 2, in step 1f-20, a terminal (1f-05) in an RRC connection state with cell 1 (1f-10) receives an RRC release message indicating a transition to an RRC INACTIVE state from the cell. The RRCRelease message may include a suspension configuration, and thus may include configuration information for the terminal to operate in the RRC INACTIVE state.

[0127] In the present embodiment, it is proposed that the RRCRelease message include configuration information related to performing the SBFD operation by the UE even in the RRC INACTIVE state. For example, when the UE performs the RRC Resume procedure in the RRC INACTIVE state, at least one or more of an indicator indicating whether to perform the SBFD random access procedure, a list of neighboring cells including SBFD resource configurations and SBFD configuration information of the corresponding cells, a timer (Txxx) for which the SBFD configurations are valid, a configuration related to CBRA or CFRA based on SBFD, a Configured grant resource configuration related to a cell in which a RACH-less resume operation can be performed, and a timer (Tyyy) for which the RACH-less resume is valid may be included.

[0128] In step 1f-30, if a resume cause occurs and a resume procedure is triggered in step 1f-35, and the corresponding cell is the most recent serving cell or a cell in the list of cells to which SBFD-based random access can be applied, and the configured timers (Txxx, Tyyy) are running, the terminal (1f-05) can perform an RRC resume procedure for the corresponding cell based on SBFD according to the configuration received in step 1f-25. At this time, the terminal (1f-05) can perform an SBFD-based CBRA or CFRA operation, or an SBFD RACH-less resume procedure (using an SBFD-based configured grant and dynamic grant).

[0129] In step 1f-45, if a resume cause occurs and the resume procedure is triggered and the corresponding cell is not the most recent serving cell, the terminal (1f-05) receives SIB1 for the target cell performing RRC resume in step 1f-50 and checks the common configuration information of the corresponding cell. The terminal (1f-05) can check the TDD UL / DL resource slot configuration of the corresponding cell (1f-15), the resource slot configuration in SBFD semi-static time and frequency, the RACH configuration based on SBFD, etc., and perform an RRC resume operation to the corresponding cell.

[0130] In step 1f-55 of FIG. 1, the terminal (1f-05) may transmit a random access preamble based on the SBFD random access configuration information in SIB1 received from cell 2 (1f-15). The random access procedure may be a CBRA (contention-based random access) operation based on the SBFD configuration, or may be a CFRA based on SBFD, or a RACH-less resume procedure based on SBFD. If it is a RACH-less resume procedure based on SBFD, the random access procedure is omitted, and thus the random access preamble transmission in this step is omitted.

[0131] At step 1f-60, the terminal (1f-05) can receive a random access response (RAR) message from cell 2 (1f-15). This operation is also based on the SBFD settings received from SIB1.

[0132] In step 1f-65, the terminal (1f-05) can apply the received RAR information (e.g., timing advance (TA), UL grant, Temporary C-RNTI) and transmit an RRCResumeRequest message to the cell 2 (1f-15).

[0133] At step 1f-70, the terminal (1f-05) can receive an RRCResume message in response to the RRCResumeRequest message transmitted to the cell 2 (1f-15).

[0134] In step 1f-75, the terminal (1f-05) can transmit an RRCResumeComplete message to cell 2 (1f-15) and transition to an RRC connected state. If it is a SBFD-based RACH-less resume procedure, the terminal can transmit the RRCResumeComplete message using the CG resources set in advance or the DG resources received after PDCCH monitoring in this step.

[0135] FIG. 1g is a diagram illustrating a method for a terminal supporting SBFD in an RRC connection state to perform a handover to a cell supporting SBFD according to another embodiment of the present disclosure.

[0136] This embodiment is explained based on the contents of the drawings 1c and 1d above, and the related contents refer to the above description.

[0137] First, to explain the entire operation of Example 3, in step 1g-20, a terminal (1g-05) in an RRC connection state performs data transmission and reception to cell 1 (1g-10) in an RRC connection state.

[0138] When Cell 1 (1g-10) determines that a handover to Cell 2 (1g-15) is necessary based on a channel measurement report from the terminal, it can transmit an Xn message requesting a handover to Cell 2 (1g-15) in step 1g-25. The handover preparation information message may include AS settings, terminal capabilities, etc. when the terminal is connected to Cell 1 (1g-10), and in particular, SBFD resource settings in Cell 1 (1g-10) may be included.

[0139] In step 1g-30, target cell 2 (1g-15) can transmit a handover command message to cell 1 (1g-10). The message includes RRC configuration information applied after the UE hands over to the target cell, and the RRC configuration information may include SBFD resource configuration and SBFD-based random access configuration in the target cell. In addition, when performing a handover, CFRA resources may also be provided as SBFD-based configurations. That is, preamble transmission and subsequent random access transmission procedures may be performed on SBFD resources.

[0140] In step 1g-35, the terminal (1g-05) can receive an RRC message (RRCReconfiguration message including RRCReconfigurationWithSync) indicating a handover from the serving cell, cell 1 (1g-10). Thereafter, the terminal can perform a handover procedure to the target cell, cell 2 (1g-15) according to the received handover settings. First, a CFRA or RACH-less handover operation can be performed according to the settings, and the resource performed at this time can be an SBFD resource.

[0141] When the RACH-less handover configuration is used above, TA information in the target cell may also be provided, and CG (configured grant) resource configuration for the first UL transmission in the target cell may also be included. Alternatively, a RACH-less handover based on DG (dynamic grant) may also be performed. In the above step, the UE may indicate the completion of the handover procedure by transmitting an RRCReconfigurationComplete message to the target cell, Cell 2 (1g-15).

[0142] The above terminal (1g-05) can apply the RRC settings received from cell 2 (1g-15) and apply the SBFD resource settings. Basically, it can apply the SBFD resource use and random access operation while following the operation of the UL / DL resource slot in the TDD broadcasted in SIB1. For example, if the TDD resource settings and the SBFD resource settings match, the PDCCH monitoring operation can be performed on the DL resources in the corresponding SBFD slot and the DL resources in the non-SBFD slot. In addition, the uplink transmission can be performed on the UL resources in the corresponding SBFD slot and the UL resources in the non-SBFD slot.

[0143] In step 1g-45, cell 2 (1g-15) determines UL / DL scheduling based on TDD resource information and SBFD resource settings set for the terminal, and can transmit signaling (DCI; downlink control information) including the scheduling in step 1g-50.

[0144] In step 1g-55, the terminal (1g-05) can perform downlink physical downlink control channel (PDSCH) reception and uplink physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission according to the indicated scheduling information.

[0145] FIG. 1h is a diagram illustrating a method in which a terminal supporting SBFD in an RRC connection state performs random access by receiving a PDCCH order from a cell according to another embodiment of the present disclosure.

[0146] This embodiment is explained based on the contents of the drawings 1c and 1d above, and the related contents refer to the above description.

[0147] First, to explain the entire operation of Embodiment 4, a terminal (1h-05) in an RRC IDLE state can camp on cell 1 (1h-10) and receive system information from the cell. In particular, in step 1h-15, the terminal (1h-05) can receive SIB1 from cell 1 (1h-10). At least one of a slot configuration of a semi-static uplink / downlink (UL / DL) resource in TDD, a slot configuration of an SBFD resource in the UL / DL, and a random access configuration for the SBFD UE and the legacy UE (RACH configuration for the legacy UE and the SBFD UE) can be transmitted in the SIB1. For detailed configuration contents, refer to the description in FIGS. 1c and 1d described above.

[0148] In FIG. 1h-20, the terminal (1h-05) applies the settings in SIB1 received from cell 1 (1h-10) and can confirm random access operation by combining SBFD resource configuration information and random access configuration. For detailed operation, refer to the procedure described in FIG. 1e.

[0149] Thereafter, in step 1h-30, the serving cell (1h-10) may transmit RRC configuration information (RRC reconfiguration) to the terminal (1h-05), and the configuration may include SBFD-related resources and SBFD random access configuration. This is a configuration for supporting SBFD in an RRC connected state, and may be the same as the configuration transmitted in SIB1 in step 1h-15, or may be a different configuration.

[0150] For example, SBFD resource configuration information can be semi-static for a cell, in which case it can be the same as the configuration in SIB1. Meanwhile, in the case of SBFD RACH configuration, there can be differences because the SBFD RACH configuration for a terminal in RRC IDLE state and the SBFD RACH configuration for a terminal in RRC connected state can be different. In addition, the terminal can apply a valid TA (Timing advance) value obtained through random access, and operates the TA timer in steps of 1h-25.

[0151] According to the preset TA timer threshold, a PDCCH order can be received from the serving cell (1h-10) at step 1h-35 before the TA timer expires. This is an operation for the serving cell to update a valid TA value again because it knows the TA timer expiration time and TA value for the corresponding terminal. Random access triggering through the above PDCCH order can also be performed through the SBFD resource (section).

[0152] - Case 1: TA timer expires and downlink data is generated, so it is performed to establish UL synchronization for pTag (primary Timing Advance Group) -> contention free random access (CFRA) or contention based random access (CBRA) is used.

[0153] - Case 2: Performed to establish uplink (UL) synchronization for sTag (secondary Timing Advance Group) -> Use CFRA

[0154] Additionally, in the above procedure, a method for the terminal to instruct a random access procedure through SBFD resources may also be separately instructed.

[0155] 1. First instruction method: If SBFD resources and SBFD random access settings exist in RRC settings, always perform SBFD random access (implementationally, the terminal can choose between existing random access and SBFD random access).

[0156] 2. Second Instruction Method: Includes an instruction setting indicating the random access method to be used when random access is through PDCCH order with RRC settings (SBFD random access or existing random access).

[0157] 3. Third instruction method: Including an instruction to apply SBFD random access within the PDCCH order (by adding a downlink control information (DCI) field or introducing a new DCI)

[0158] 4. 4th Instruction Method: Provide conditions through RRC settings so that the terminal checks the conditions and applies SBFD random access (for example, determines based on the received signal power (RSRP) of the most recently received signal; if RSRP is good, perform SBFD random access).

[0159] At step 1h-35, the terminal (1h-05) can perform random access according to the indicated method.

[0160] In step 1h-40, cell 1 (1h-10) determines UL / DL scheduling based on TDD resource information and SBFD resource settings set for the terminal, and in step 1h-45, can transmit signaling (DCI; downlink control information) including the scheduling.

[0161] In step 1h-50, the terminal (1h-10) can perform downlink physical downlink shared channel (PDSCH) reception and uplink physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission according to the indicated scheduling information.

[0162] FIG. 1i is a diagram illustrating a method for a terminal supporting SBFD in an RRC connection state to perform random access in a beam failure recovery procedure after performing beam failure detection from a cell according to an embodiment of the present disclosure.

[0163] This embodiment is explained based on the contents of the drawings 1c and 1d above, and the related contents refer to the above description.

[0164] To explain the entire operation of Embodiment 5, a terminal (1i-05) in an RRC IDLE state can camp on cell 1 (1i-10) and receive system information from the cell. In particular, in step 1i-15, the terminal (1i-05) can receive system information block 1 (SIB1) from cell 1 (1i-10). At least one of a slot configuration of a semi-static uplink / downlink (UL / DL) resource in TDD, a slot configuration of an SBFD resource in the UL / DL, and a random access configuration for the SBFD UE and the legacy UE (RACH configuration for the legacy UE and the SBFD UE) can be transmitted in the SIB1. For detailed configuration contents, refer to the description in FIGS. 1c and 1d above.

[0165] In FIG. 1i-20, the terminal (1i-05) applies the settings in SIB1 received from cell 1 (1i-10) and can confirm random access operation by combining SBFD resource configuration information and random access configuration. For detailed operation, refer to the procedure described in FIG. 1e.

[0166] Afterwards, in step 1i-25, the serving cell (1i-10) transmits RRC configuration information (RRC reconfiguration) to the UE, and the configuration may include SBFD-related resources, SBFD random access configuration, TCI state configuration, and BFD / BFR (beam failure detection / beam failure recovery)-related configuration. This is a configuration for supporting SBFD in an RRC connected state, and may be the same as or different from the configuration transmitted in SIB1 in step 1i-15. For example, the SBFD resource configuration information may be semi-static for the cell, in which case, it may be the same as the configuration in SIB1. On the other hand, in the case of SBFD RACH configuration, there may be a difference because the SBFD RACH configuration for a UE in an RRC IDLE state may be different from the SBFD RACH configuration for a UE in an RRC connected state. In particular, for BFD / BFR settings, it may include settings for beams that the terminal should monitor in a connected state (RadioLinkMonitoringConfig) and settings for beam recovery (BeamFailureRecoveryConfig).

[0167] Settings for beams to be monitored can be referred to [Table 3] below, and settings for beam recovery can be referred to [Table 4] below.

[0168]

[0169]

[0170] In summary, the terminal monitors beam performance, and if the performance of the monitored beams is determined to be below that of the serving cell, a beam failure is triggered. If the cell is a PCell, the terminal can trigger a random access according to the beam failure, and transmit a BFR media access control (MAC) control element (CE) reporting the beam failure and a valid beam to the base station during the random access process. That is, the terminal performs a random access when BFR occurs according to BFD. In this embodiment, it is proposed to perform random access through SBFD resources, which is different from the conventional method. To this end, the base station can provide an indicator indicating the use of SBFD random access in random access according to BFR through an RRC configuration. Alternatively, if an SBFD resource configuration exists, the SBFD resource can be included in the random access configuration within the provided BFR configuration and configured. The terminal can perform an operation according to the RACH configuration, or determine the random access mode according to the terminal's judgment. Alternatively, a condition for applying SBFD random access is provided and the terminal can perform SBFD random access when the condition (for example, when the RSRP strength of the received SSB is greater than a specific threshold) is satisfied.

[0171] In step 1i-30, the terminal (1i-05) monitors the configured BFD resources (RadioLinkMonitoringConfig), and if a beam failure is detected for the corresponding beams, BFR is triggered. In this case, a beam failure may mean a case where the signal strength of the beam is detected to be below a certain threshold more than the number of times set.

[0172] In step 1i-35, the terminal (1i-05) requests SR resources for BFR transmission and triggers random access. In this step, the terminal can perform the SBFD random access procedure according to the configured and established rules.

[0173] In step 1i-40, the terminal (1i-05) may apply SBFD random access in the random access procedure when BFR is triggered in the sPCell, and may transmit BFR-related information to the base station by transmitting a BFR MAC CE in that step. The base station and serving cell that receive this may instruct a beam update by referring to the candidate beam information reported in the BFR MAC CE in step 1i-45. This is possible through the RRC configuration / TCI state activation via MAC CE / beam instruction procedure via DCI. At this time, beam instruction via SBFD resources is also possible.

[0174] In step 1i-50, cell 1 (1i-10) determines UL / DL scheduling based on TDD resource information and SBFD resource settings set for the terminal (1i-05), and can transmit signaling (DCI; downlink control information) including the scheduling in step 1i-55.

[0175] In step 1i-60, the terminal (1i-05) can perform downlink physical downlink shared channel (PDSCH) reception and uplink physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission according to the indicated scheduling information.

[0176] FIG. 1J is a diagram illustrating the operation of a terminal performing random access using SBFD resources according to one embodiment of the present disclosure.

[0177] In step 1j-05, the terminal can receive SBFD resources and SBFD random access configurations from system information (e.g., system information block 1, SIB1) broadcast by the base station. These configurations are provided together with TDD UL / DL resource slot configurations, and are provided so as to satisfy the validity between the configurations and SBFD. For detailed operations, refer to the TDD UL / DL resource configurations and SBFD configurations of FIGS. 1c and 1d described above.

[0178] In step 1j-10, the terminal establishes an RRC connection procedure with the base station. If the received SIB1 includes SBFD random access settings, random access can be performed using SBFD resources. However, if the settings do not exist or the SBFD random access conditions are not met, the existing random access procedure can be performed.

[0179] In step 1j-15, the terminal can perform data transmission and reception through SBFD resources.

[0180] In steps 1j-20, the terminal can perform related operations when a random access situation occurs via SBFD resources. Related operations may include handover, BFR, PDCCH order, RRC Resume after INACTIVE transition, etc. For detailed operations, refer to the embodiments of the present invention. That is, when a random access occurs due to the above step, random access can be performed via SBFD resources or existing resources in step 1j-25.

[0181] FIG. 1k is a diagram illustrating the operation of a base station according to one embodiment of the present disclosure.

[0182] At step 1k-05, the base station can broadcast SBFD resources and SBFD random access configurations in system information (e.g., system information block 1, SIB1). These configurations are provided together with TDD UL / DL resource slot configurations, and are provided to satisfy the validity between these configurations and SBFD. For detailed operation, refer to the TDD UL / DL resource configurations and SBFD configurations of FIGS. 1c and 1d described above.

[0183] At step 1k-10, the terminal can utilize SBFD resources in the RRC connection procedure, and the base station can also perform a random access procedure in response.

[0184] At step 1k-15, the base station can collect terminal capabilities from connected terminals, and these terminal capability reports include SBFD-related terminal capabilities. These capabilities can be provided on a per-terminal basis or on a band-by-band basis (e.g., TDD bands). Alternatively, SBFD random access-related capabilities can be reported separately, and these can also be provided on a per-terminal and band-by-band basis (e.g., TDD bands). Alternatively, they can be included in FeatureCombination and transmitted.

[0185] At step 1k-20, the base station can set SBFD-related settings and transmit them to the terminal through an RRC configuration message.

[0186] At step 1k-25, the base station can perform UL / DL scheduling and data transmission / reception through SBFD resources for the terminal after the RRC connection procedure and setup.

[0187] At step 1k-30, the base station may perform () related operations when a random access situation occurs via SBFD resources. Related operations may include handover, BFR, PDCCH order, RRC Resume after INACTIVE transition, etc. For detailed operations, refer to the embodiments of the present invention.

[0188] FIG. 1l is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0189] Referring to FIG. 1l, the terminal includes an RF (Radio Frequency) processing unit (1l-10), a baseband processing unit (1l-20), a storage unit (1l-30), and a control unit (1l-40).

[0190] The RF processing unit (11-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (11-10) up-converts the baseband signal provided from the baseband processing unit (11-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (11-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. In the drawing, only one antenna is illustrated, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (11-10) may include multiple RF chains. Furthermore, the RF processing unit (11-10) may perform beamforming. For the above beamforming, the RF processing unit (11-10) can adjust the phase and size of each signal transmitted and received through multiple antennas or antenna elements. In addition, the RF processing unit can perform MIMO, and can receive multiple layers when performing the MIMO operation.

[0191] The baseband processing unit (11-20) performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (11-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (11-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (11-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (11-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols by performing an inverse fast Fourier transform (IFFT) operation and inserting a cyclic prefix (CP). In addition, when receiving data, the baseband processing unit (11-20) divides the baseband signal provided from the RF processing unit (11-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT (fast Fourier transform) operation, and then restores the received bit string through demodulation and decoding.

[0192] The baseband processing unit (11-20) and the RF processing unit (11-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (11-20) and the RF processing unit (11-10) may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit (11-20) and the RF processing unit (11-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processing unit (11-20) and the RF processing unit (11-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. Additionally, the different frequency bands may include a super high frequency (SHF) (e.g., 2.NRHz, NRhz) band, a millimeter wave (mm wave) (e.g., 60GHz) band.

[0193] The storage unit (1l-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (1l-30) can store information related to a second access node that performs wireless communication using a second wireless access technology. In addition, the storage unit (1l-30) provides the stored data at the request of the control unit (1l-40).

[0194] The above control unit (11-40) controls the overall operations of the terminal. For example, the control unit (11-40) transmits and receives signals through the baseband processing unit (11-20) and the RF processing unit (11-10). In addition, the control unit (11-40) records and reads data in the storage unit (11-40). For this purpose, the control unit (11-40) may include at least one processor. For example, the control unit (11-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs.

[0195] FIG. 1m is a block diagram illustrating a configuration of a base station according to one embodiment of the present disclosure.

[0196] As shown in the above drawing, the base station is configured to include an RF processing unit (1m-10), a baseband processing unit (1m-20), a backhaul communication unit (1m-30), a storage unit (1m-40), and a control unit (1m-50).

[0197] The RF processing unit (1m-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1m-10) up-converts the baseband signal provided from the baseband processing unit (1m-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1m-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In the drawing, only one antenna is shown, but the first access node may have multiple antennas. In addition, the RF processing unit (1m-10) may include multiple RF chains. Furthermore, the RF processing unit (1m-10) may perform beamforming. For the above beamforming, the RF processing unit (1m-10) can adjust the phase and magnitude of each signal transmitted and received through multiple antennas or antenna elements. The RF processing unit can perform a downlink MIMO operation by transmitting one or more layers.

[0198] The baseband processing unit (1m-20) performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (1m-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (1m-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (1m-10). For example, in the case of OFDM, when transmitting data, the baseband processing unit (1m-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit (1m-20) divides the baseband signal provided from the RF processing unit (1m-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operation, and then restores the received bit string through demodulation and decoding. The baseband processing unit (1m-20) and the RF processing unit (1m-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1m-20) and the RF processing unit (1m-10) may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0199] The above backhaul communication unit (1m-30) provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit (1m-30) converts a bit string transmitted from the main base station to another node, such as an auxiliary base station or core network, into a physical signal, and converts a physical signal received from the other node into a bit string.

[0200] The storage unit (1m-40) stores data such as basic programs, application programs, and configuration information for the operation of the main base station. In particular, the storage unit (1m-40) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, and the like. In addition, the storage unit (1m-40) can store information that serves as a judgment criterion for whether to provide or terminate multiple connections to a terminal. In addition, the storage unit (1m-40) provides the stored data at the request of the control unit (1m-50).

[0201] The control unit (1m-50) controls the overall operations of the base station. For example, the control unit (1m-50) transmits and receives signals through the baseband processing unit (1m-20) and the RF processing unit (1m-10) or through the backhaul communication unit (1m-30). In addition, the control unit (1m-50) records and reads data in the storage unit (1m-40). For this purpose, the control unit (1m-50) may include at least one processor.

[0202] It should be noted that the aforementioned configuration diagrams, examples of control / data signal transmission methods, examples of operational procedures, and configuration diagrams are not intended to limit the scope of the present disclosure. That is, not all components, entities, or operational steps described in the embodiments of the present disclosure should be construed as essential components for implementing the disclosure, and implementations may be made within a scope that does not detract from the essence of the disclosure even if only some components are included. Furthermore, each embodiment may be combined and operated as needed. For example, parts of the methods proposed in the present disclosure may be combined to operate network entities and terminals.

[0203] The operations of the base station or terminal described above can be realized by providing a memory device storing the corresponding program code in any component within the base station or terminal device. That is, the control unit of the base station or terminal device can execute the operations described above by reading and executing the program code stored in the memory device using a processor or CPU (Central Processing Unit).

[0204] The various components and modules of the entity, base station or terminal device described in the present disclosure may be operated using hardware circuits, such as logic circuits based on complementary metal oxide semiconductors, firmware, software and / or hardware and firmware and / or software embedded in a machine-readable medium. For example, various electrical structures and methods may be implemented using electrical circuits such as transistors, logic gates and application-specific semiconductors.

[0205] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present disclosure.

[0206] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0207] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0208] In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed in the singular or plural form, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0209] Meanwhile, although the detailed description of the present disclosure has described specific embodiments, it is obvious that various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the following claims but also by equivalents of the scope of the claims. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, each of the above embodiments can be combined and operated with each other as needed. For example, parts of the methods proposed in the present disclosure can be combined with each other to operate a base station and a terminal. In addition, although the above embodiments have been presented based on a 5G, NR system, other modifications based on the technical idea of ​​the above embodiments can be implemented with other systems such as LTE, LTE-A, and LTE-A-Pro systems.

[0210] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be defined not only by the scope of the claims described below, but also by equivalents thereof.

Claims

1. In a method performed by a terminal in a wireless communication system A step of receiving, from a base station, a system information block (SIB1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD; A step of performing a random access procedure with the base station based on the SBFD resource configuration information and the RACH configuration information related to the SBFD, A method characterized in that the RACH configuration information related to the above SBFD is related to either a single RACH configuration or an additional RACH configuration.

2. In paragraph 1, A method characterized in that, when the SIB1 includes information related to an indication of the Single RACH configuration, the RACH configuration information is related to the Single RACH configuration.

3. In paragraph 1, A method characterized in that, if the above SIB1 does not include information related to an indication of a single RACH configuration, the RACH configuration information corresponds to an additional RACH Configuration.

4. In paragraph 1, The above TDD resource configuration information further includes symbol resource configuration information, A method characterized in that a downlink subband frequency region is set in a flexible symbol set based on the above symbol resource setting information.

5. In a method performed by a base station in a wireless communication system, A step of transmitting, to a terminal, a system information block (SIB1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD; A step of performing a random access procedure with the base station based on the SBFD resource configuration information and the RACH configuration information related to the SBFD, A method characterized in that the RACH configuration information related to the above SBFD is related to either a single RACH configuration or an additional RACH configuration.

6. In paragraph 5, A method characterized in that, when the SIB1 includes information related to an indication of the Single RACH configuration, the RACH configuration information is related to the Single RACH configuration.

7. In paragraph 5, A method characterized in that, if the above SIB1 does not include information related to an indication of a single RACH configuration, the RACH configuration information corresponds to an additional RACH Configuration.

8. In paragraph 1, The above TDD resource configuration information further includes symbol resource configuration information, A method characterized in that a downlink subband frequency region is set in a flexible symbol set based on the above symbol resource setting information.

9. In a terminal in a wireless communication system, A transceiver for transmitting and receiving signals; and It includes a control unit connected to the above transmitter and receiver, and the control unit, Receive, from a base station, a system information block (System Information Block 1, SIB1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD, Based on the above SBFD resource configuration information and the RACH configuration information related to the SBFD, a random access procedure is performed with the base station, A terminal characterized in that the RACH configuration information related to the above SBFD is related to either a single RACH configuration or an additional RACH configuration.

10. In paragraph 9, A terminal characterized in that, when the SIB1 includes information related to an indication of the Single RACH configuration, the RACH configuration information is related to the Single RACH configuration.

11. In paragraph 9, A terminal characterized in that, if the above SIB1 does not include information related to an indication of a single RACH configuration, the RACH configuration information corresponds to an additional RACH Configuration.

12. In paragraph 9, The above TDD resource configuration information further includes symbol resource configuration information, A terminal characterized in that a downlink subband frequency region is set in a flexible symbol set based on the above symbol resource setting information.

13. In a wireless communication system, at a base station, A transceiver for transmitting and receiving signals; and It includes a control unit connected to the above transmitter and receiver, and the control unit, Transmitting a system information block (SIB1) including Time Division Duplex (TDD) resource configuration information including Subband Full Duplex (SBFD) resource configuration information and Random Access Channel (RACH) configuration information related to SBFD to the terminal, Based on the above SBFD resource configuration information and the RACH configuration information related to the SBFD, a random access procedure is performed with the base station, A base station characterized in that the RACH configuration information related to the above SBFD is related to either a single RACH configuration or an additional RACH configuration.

14. In paragraph 13, If the above SIB1 includes information related to the indication of the Single RACH configuration, the RACH configuration information is related to the Single RACH configuration, A base station characterized in that, if the above SIB1 does not include information related to an indication of a single RACH configuration, the RACH configuration information corresponds to an additional RACH Configuration.

15. In paragraph 13, The above TDD resource configuration information further includes symbol resource configuration information, A base station characterized in that a downlink subband frequency region is set in a flexible symbol set based on the above symbol resource setting information.

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