Wireless asynchronous signal processing device and method of network control repeater in next generation mobile wireless communication system

Abstract

A method performed by a network control relay (NCR) including a network control relay (NCR) mobile terminal (NCR-MT) and an NCR forwarding (NCR-FWD) in a wireless communication system is provided. The method comprises: receiving, by an NCR-MT, side control information from a base station; detecting a beam failure of the NCR-MT; stopping forwarding by the NCR-FWD based on detecting a beam failure; identifying the completion condition of beam failure recovery; based on completion of the beam failure recovery, the forwarding is resumed using the side control information received prior to detecting the beam failure.

Description

Technical Field

[0001] This disclosure relates to the operation of a terminal in a wireless communication system. Specifically, this disclosure relates to a wireless repeater controlled by a base station. Background Technology

[0002] Fifth-generation (5G) mobile communication technology defines a wide frequency band, enabling high transmission rates and new services. It can be implemented not only in "sub-6 GHz" bands such as 3.5 GHz, but also in "above 6 GHz" bands, including 28 GHz and 39 GHz, known as millimeter waves (mmWave). Furthermore, sixth-generation (6G) mobile communication technology (called Super 5G systems) has been considered for implementation in terahertz (THz) bands (e.g., the 95 GHz to 3 THz band) to achieve transmission rates fifty times faster than 5G and ultra-low latency one-tenth that of 5G.

[0003] At the outset of 5G mobile communication technology development, in order to support services and meet performance requirements associated with enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC), standardization was underway regarding beamforming and multiple-input multiple-output (MIMO) for mitigating radio wave path loss and increasing radio wave transmission distance in mmWave; dynamic operation supporting parameter sets (e.g., operating multiple subcarrier spacings) and time slot formats for efficient utilization of mmWave resources; initial access technologies for supporting multi-beam transmission and broadband; the definition and operation of bandwidth portions (BWP); new channel coding methods such as low-density parity-check (LDPC) codes for large-volume data transmission and polar codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks for specific services.

[0004] Currently, given the services that 5G mobile communication technology needs to support, there is ongoing discussion about improvements and performance enhancements to the initial 5G mobile communication technology, and there is already physical layer standardization for technologies such as: Vehicle-to-Everything (V2X) for assisting autonomous vehicle driving determination based on information sent by the vehicle about its location and status and for enhancing user convenience; New Radio Unlicensed (NR-U) for system operation aimed at complying with various regulatory requirements in unlicensed frequency bands; NR UE power saving; Non-Terrestrial Networks (NTN) for providing coverage in areas where communication with terrestrial networks is unavailable, as UE-satellite direct communication; and positioning.

[0005] Furthermore, standardization is ongoing for air interface architectures / protocols related to technologies such as the Industrial Internet of Things (IIoT) for supporting new services through interoperability and convergence with other industries, Integrated Access and Backhaul (IAB) for providing nodes for network service area extension by supporting wireless backhaul and access links in an integrated manner, mobility enhancements including conditional handover and Dual Active Protocol Stack (DAPS) handover, and Two-Step Random Access (NR Two-Step RACH) for simplifying the random access process. Standardization is also underway for 5G baseline architectures (e.g., service-based architectures or service-based interfaces) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, as well as system architectures / services for Mobile Edge Computing (MEC) based on UE location reception services.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of connected devices will connect to communication networks, and correspondingly, enhanced functionality and performance of 5G mobile communication systems, as well as the integrated operation of connected devices, are expected to be necessary. To this end, new research is planned related to: Extended Reality (XR) for effectively supporting Augmented Reality (AR), Virtual Reality (VR), Mixed Reality (MR), etc.; 5G performance enhancement and complexity reduction through the utilization of Artificial Intelligence (AI) and Machine Learning (ML); AI service support; Metaverse service support; and drone communications.

[0007] Furthermore, such development of 5G mobile communication systems will serve as the foundation for not only the development of new waveforms for providing terahertz band coverage for 6G mobile communication technologies, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive MIMO, metamaterial-based lenses and antennas for improving terahertz band signal coverage, high-dimensional spatial multiplexing technologies utilizing orbital angular momentum (OAM), and reconfigurable smart surfaces (RIS), but also the development of the following: full-duplex technologies for improving the frequency efficiency of 6G mobile communication technologies and enhancing system networks, AI-based communication technologies for system optimization by leveraging satellites and AI from the design phase and internalizing end-to-end AI support functions, and next-generation distributed computing technologies that enable services at a level of complexity exceeding the operational capabilities of UEs by utilizing ultra-high-performance communication and computing resources.

[0008] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion has been made as to whether any of the above information is applicable as prior art to this disclosure.

[0009] As various services can be provided as described above, and with the development of mobile communication systems, there is a need for an effective method to provide these services. Summary of the Invention

[0010] Technical issues

[0011] This disclosure aims to provide a method for defining operations of a forwarding entity when an out-of-sync indication occurs in a network control repeater, and for performing operations of the forwarding entity after the out-of-sync is recovered, as well as apparatus for the method.

[0012] In addition, this disclosure provides a method and apparatus for suspending or resuming network controlled repeater forwarding (NCR-FWD).

[0013] Technical solution

[0014] According to embodiments of this disclosure, a method is provided performed by an NCR in a wireless communication system, including a network control repeater (NCR) mobile terminal (NCR-MT) and an NCR forwarder (NCR-FWD). The method includes: the NCR-MT receiving side control information from a base station; detecting a beam failure of the NCR-MT; the NCR-FWD stopping forwarding based on the beam failure detection; recognizing completion of beam failure recovery; and resuming forwarding using side control information received prior to the beam failure detection based on the completion of beam failure recovery.

[0015] According to another embodiment of this disclosure, a method performed by a base station in a wireless communication system is provided. The method includes transmitting side control information to an NCR comprising a network control repeater (NCR) mobile terminal (NCR-MT) and an NCR forwarder (NCR-FWD), wherein forwarding is stopped based on beam failure detection between the base station and the NCR-MT, wherein beam failure recovery is performed between the base station and the NCR, and wherein forwarding is resumed using the side control information transmitted before beam failure detection based on the completion of beam failure recovery.

[0016] According to another embodiment of this disclosure, a network control repeater (NCR) is provided in a wireless communication system, including an NCR mobile terminal (NCR-MT) and an NCR forwarder (NCR-FWD). The NCR includes a transceiver and at least one processor configured to receive side control information from a base station, detect beam failure of the NCR-MT, stop forwarding based on the beam failure detection, identify completion of beam failure recovery, and resume forwarding using side control information received prior to the beam failure detection based on the completion of beam failure recovery.

[0017] According to another embodiment of this disclosure, a base station in a wireless communication system is provided. The base station includes a transceiver and at least one processor configured to transmit side control information to an NCR including a Network Control Repeater (NCR) Mobile Terminal (NCR-MT) and an NCR Forwarder (NCR-FWD), wherein forwarding stops based on beam failure detection between the base station and the NCR-MT, wherein beam failure recovery is performed between the base station and the NCR, and wherein forwarding is resumed based on the completion of beam failure recovery, using the side control information transmitted before beam failure detection.

[0018] Beneficial effects

[0019] According to embodiments of this disclosure, the network control repeater can perform relay operations with optimal configuration after the T310 timer is started.

[0020] Furthermore, according to embodiments of this disclosure, after the forwarding of NCR-FWD is restored, the operation of FWD can be restored as soon as possible by using the side control information received before the MT autonomous shutdown (OFF) to quickly provide effective services to the service terminal.

[0021] Before proceeding with the detailed description below, it may be helpful to provide definitions for certain words and phrases used in this patent document: the terms “include” and “comprise” and their derivatives mean unlimited inclusion; the term “or” is inclusive, meaning and / or; the phrases “associated with” and “associated therewith” and their derivatives may mean including, being included in, interconnected with, containing, being contained within, connected to or connected with, coupled to or coupled with, able to communicate with, cooperate with, intertwined, parallel, proximate, bound to, having, possessing the properties of, etc.; the term “controller” means any device, system, or part thereof that controls at least one operation, such device may be implemented in hardware, firmware, or software, or in some combination of at least two of them. It should be noted that the functionality associated with any particular controller may be centralized or distributed, local or remote.

[0022] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each computer program consisting of computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementation in appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any medium that can be accessed by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, optical disc (CD), digital video disc (DVD), or any other type of storage. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media that can permanently store data and media that can store data and subsequently overwrite it, such as rewritable optical discs or erasable memory devices.

[0023] Certain words and phrases are defined in this patent document, and those skilled in the art will understand that, in many, if not most, cases, such definitions apply to the prior and future use of these defined words and phrases. Attached Figure Description

[0024] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0025] Figure 1 The structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure is shown;

[0026] Figure 2 A radio protocol structure in an LTE system according to an embodiment of the present disclosure is shown;

[0027] Figure 3 The structure of a next-generation mobile communication system according to an embodiment of the present disclosure is shown;

[0028] Figure 4 A radio protocol structure in a next-generation mobile communication system according to an embodiment of the present disclosure is shown;

[0029] Figure 5 The structure of a terminal in a wireless communication system according to an embodiment of the present disclosure is shown;

[0030] Figure 6 This is a block diagram illustrating the configuration of a base station in a wireless communication system according to embodiments of the present disclosure;

[0031] Figure 7 The structure of a network control repeater (NCR) according to an embodiment of the present disclosure is shown.

[0032] Figure 8 A method of operating the T310 timer according to an embodiment of the present disclosure is shown.

[0033] Figure 9 An NCR-FWD operation method incorporating T310 timer operation is illustrated according to an embodiment of the present disclosure.

[0034] Figure 10 A method for restoring FWD ON operation according to an embodiment of the present disclosure is shown.

[0035] Figure 11 Another method for restoring FWD on operation according to embodiments of the present disclosure is shown.

[0036] Figure 12 A method for maintaining configuration information for the on / off state of FWD according to embodiments of the present disclosure is shown.

[0037] Figure 13 A flowchart of an NCR method according to an embodiment of the present disclosure is shown. Detailed Implementation

[0038] The following discussion Figures 1 to 13 The various embodiments described in this patent document to illustrate the principles of this disclosure are merely examples and should not be construed as limiting the scope of this disclosure in any way. Those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged system or device.

[0039] Embodiments of this disclosure are described with reference to the accompanying drawings.

[0040] Throughout this specification, the same or similar reference numerals denote the same or similar elements. Furthermore, in describing this disclosure, detailed descriptions of known functions or configurations included will be omitted where it is determined that such detailed descriptions might unnecessarily obscure the subject matter of this disclosure. The terminology described below is defined with reference to the functions in this disclosure and may vary depending on the user, their intent, or custom. Therefore, the definitions of terminology should be based on the entirety of this specification.

[0041] In the following description, for convenience, terms for identifying access nodes, referring to network entities, referring to messages, referring to interfaces between network entities, referring to various types of identification information, etc., are used by way of example. Therefore, this disclosure is not limited to the terms used below, and other terms that refer to subjects with equivalent technical meanings may be used.

[0042] In the following description, a BS is an entity that allocates resources to a terminal and can be at least one of a gNode B, eNode B, Node B, BS, radio access unit, BS controller, and nodes on a network. A terminal can include a user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. In this disclosure, "downlink" refers to the radio link through which a base station transmits signals to a terminal, while "uplink" refers to the radio link through which a terminal transmits signals to a base station. Furthermore, although the following description is exemplified for Long Term Evolution (LTE) or LTE-A systems, embodiments of this disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. Examples of other communication systems may include 5G New Radio (NR), developed after LTE-A, and in the following description, "5G" can be a concept covering existing LTE, LTE-A, and other similar services. Additionally, based on the determination of those skilled in the art, this disclosure can be applied to other communication systems with modifications without significantly departing from the scope of this disclosure.

[0043] In this document, it will be understood that each box in a flowchart illustration, and combinations of boxes in a flowchart illustration, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create parts for implementing the functions specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable storage medium, which can instruct the computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article comprising instruction parts that implement the functions specified in one or more flowchart boxes. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowchart boxes.

[0044] Furthermore, each box in the flowchart diagram can represent a module, segment, or section of code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the boxes may occur out of order. For example, two boxes shown consecutively may actually execute substantially simultaneously, or these boxes may sometimes execute in reverse order, depending on the functions involved.

[0045] As used herein, "cell" refers to a software or hardware element that performs a predetermined function, such as a field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC). However, the term "cell" is not always limited to software or hardware. A "cell" can be configured to be stored in addressable storage media or to execute one or more processors. Thus, a "cell" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. Elements and functions provided by a "cell" can be combined into a smaller number of elements or "cells," or divided into a larger number of elements or "cells." Furthermore, elements and "cells" can be implemented as one or more CPUs within a playback device or secure multimedia card. Additionally, the term "cell" in the embodiments can include one or more processors.

[0046] In the following description, for ease of description, the terms and names defined in the 5GS and NR standards, which are standards defined by the 3GPP organization in current existing communication standards, will be used to describe this disclosure. However, this disclosure is not limited to these terms and names and can be applied in the same manner to wireless communication networks conforming to other standards. For example, this disclosure can be applied to 3GPP 5GS / NR (the fifth-generation mobile communication standard).

[0047] Figure 1 The structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure is shown.

[0048] refer to Figure 1 The radio access network of an LTE system may include next-generation base stations (evolved Node B, hereinafter referred to as "ENB", "Node B" or "base station") 1-05, 1-10, 1-15 and 1-20, a Mobility Management Entity (MME) 1-25 and a Serving Gateway (S-GW) 1-30. User equipment (hereinafter referred to as "UE" or "terminal") 1-35 can access external networks through ENB 1-05 to 1-20 and S-GW 1-30.

[0049] exist Figure 1In this context, ENBs 1-05 to 1-20 can correspond to existing Node Bs in a Universal Mobile Telecommunications System (UMTS). An ENB can connect to User Equipment (UE) 1-35 via a radio channel and can perform more complex functions than an existing Node B. In LTE systems, all user services, including real-time services such as Voice over Internet Protocol (VoIP), can be served via a shared channel. Therefore, devices may be needed for collecting state information (such as UE buffer state information, UE available transmission power state information, and UE channel state information) and performing scheduling, and each of ENBs 1-05 to 1-20 can act as such a device.

[0050] A single ENB can typically control multiple cells. For example, LTE systems use radio access technologies such as Orthogonal Frequency Division Multiplexing (OFDM) within a 20 MHz bandwidth to achieve data rates of 100 Mbps. Furthermore, the ENB can apply Adaptive Modulation and Coding (AMC) schemes to determine the modulation scheme and channel coding rate based on the terminal's channel state. The S-GW130 is the device used to provide data bearers and can generate or release data bearers under the control of the MME 1-25. The MME is the device used to perform the terminal's mobility management functions and various control functions, and can connect to multiple base stations.

[0051] Figure 2 A radio protocol structure in an LTE system according to an embodiment of the present disclosure is shown.

[0052] refer to Figure 2 In LTE systems, radio protocols include Packet Data Convergence Protocol (PDCP) 2-05 and 2-40, Radio Link Control (RLC) 2-10 and 2-35, Media Access Control (MAC) 2-15 and 2-30, and physical (PHY) devices in the terminal and ENB. PDCP can perform operations such as IP header compression / reconstruction. The main functions of PDCP are summarized below, but are not limited to:

[0053] - Header compression and decompression: Robust header compression (ROHC) is supported only;

[0054] -Transmission of user data;

[0055] - For RLC Acknowledgment Mode (AM), upper-layer protocol data units (PDUs) are delivered in sequence during PDCP reconstruction.

[0056] - For split bearers in dual connectivity (DC) (RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception;

[0057] - For RLC AM, the lower-level SDU is repeatedly detected during PDCP reconstruction;

[0058] - For RLC AM, PDCP SDUs are retransmitted during handover, and for split bearers in DC, PDCP PDUs are retransmitted during PDCP data recovery.

[0059] - Encryption and decryption; and / or

[0060] - Timer-based Service Data Units (SDUs) are dropped in the uplink.

[0061] Radio Link Control (RLC) 2-10 and 2-35 can reconfigure PDCP Protocol Data Units (PDUs) to an appropriate size to perform Automatic Repeat Request (ARQ) operations, etc. The main functions of the RLC are summarized below, but are not limited to:

[0062] -Transmission of upper-layer PDUs;

[0063] - Error correction via Automatic Repeat Request (ARQ) (only applicable to AM data transmission);

[0064] - Cascading, segmenting, and reassembling of RLC SDUs (only applicable to UM and AM data transfers).

[0065] - Re-segmentation of RLC PDU (only applicable to AM data transmission);

[0066] -RLC PDU reordering (only applicable to UM and AM data transfers).

[0067] - Duplicate detection (only applicable to UM and AM data transfers);

[0068] - Protocol error detection (only applicable to AM data transmission);

[0069] -RLC SDU discard (only applicable to UM and AM data transfers); and / or

[0070] -RLC reconstruction.

[0071] MAC entities 2-15 and 2-30 connect to multiple RLC layer devices configured in a single terminal and can perform operations such as multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of the MAC are summarized below, but are not limited to:

[0072] - Mapping between logical channels and transmission channels;

[0073] - Multiplexing MAC SDUs belonging to one or different logical channels into transport blocks (TBs) delivered to the physical (PHY) layer on the transport channel, and demultiplexing MAC SDUs from transport blocks (TBs) received from the physical (PHY) layer on the transport channel;

[0074] - Scheduling information report;

[0075] - Error correction is performed using Hybrid ARQ (HARQ);

[0076] - Priority processing between logical channels of a UE;

[0077] - Prioritize UEs through dynamic scheduling;

[0078] - Multimedia Broadcast Multicast Service (MBMS) service identifier;

[0079] -Transmission format selection; and / or

[0080] -filling.

[0081] Physical layer (PHY) 2-20 and 2-25 can generate OFDM symbols by channel coding and modulation of upper layer data and transmit them through radio channels; or they can demodulate and decode OFDM symbols received through radio channels and transmit them to the upper layer.

[0082] Figure 3 The structure of a next-generation mobile communication system according to an embodiment of the present disclosure is shown.

[0083] refer to Figure 3 The radio access network in next-generation mobile communication systems (hereinafter referred to as "New Radio (NR)" or 5G) may include New Radio Base Stations (New Radio Node B, hereinafter referred to as "NR gNB" or "NR Base Station") 3-10 and New Radio Core Network (NR CN) 3-05. New Radio User Equipment (hereinafter referred to as "NR UE" or "NR Terminal") 3-15 can access external networks through NR gNB 3-10 and NR CN 3-05.

[0084] exist Figure 3In this context, the NR gNB 3-10 corresponds to the evolved Node B (eNB) in an existing LTE system. The NR gNB 3-10 can connect to the NR UE 3-15 via radio channels, thus providing superior service compared to existing Node Bs. In next-generation mobile communication systems, all user services are served through shared channels. Therefore, a device is needed to collect state information (such as UE buffer state information, UE available transmission power state information, and UE channel state information) and perform scheduling; the NR gNB 3-10 can serve as such a device. A single NR gNB 3-10 can typically control multiple cells. To achieve ultra-high-speed data transmission in next-generation mobile communication systems compared to existing LTE, bandwidths equal to or exceeding the existing maximum bandwidth can be applied. Furthermore, Orthogonal Frequency Division Multiplexing (OFDM) can be used as the radio connection technology, additionally combined with beamforming technology.

[0085] Furthermore, adaptive modulation and coding (AMC) schemes that determine the modulation scheme and channel coding rate based on the terminal's channel state can be applied. The NR CN 3-05 can perform functions such as mobility support, bearer configuration, and quality of service (QoS) configuration. The NR CN 3-05 is not only a device that performs terminal mobility management functions but also various types of control functions and can connect to multiple base stations. Moreover, next-generation mobile communication systems can link with existing LTE systems, and the NR CN3-05 can connect to the MME 3-25 via a network interface. The MME 3-25 connects to the eNB 3-30, i.e., the LTE base station.

[0086] Figure 4 A radio protocol structure in a next-generation mobile communication system according to an embodiment of the present disclosure is shown.

[0087] refer to Figure 4 In the radio protocols of next-generation mobile communication systems, terminals and NR base stations may include NR Service Data Adaptation Protocol (SDAP) 4-01 and 4-45, NR PDCP 4-05 and 4-40, NR RLC 4-10 and 4-35, NR MAC 4-15 and 4-30, and NR PHY equipment (or layers) 4-20 and 4-25, respectively.

[0088] The main functions of NR SDAP 4-01 and 4-45 may include, but are not limited to, the following:

[0089] -Transmission of user plane data;

[0090] - Mapping between QoS streams and data radio bearers (DRBs) for DL ​​and UL;

[0091] - Mark QoS flow identity (ID) in DL and UL packets; and / or

[0092] - Mapping of reflective QoS flows to DRB for UL SDAP PDU.

[0093] For SDAP layer devices, terminals can receive configuration via Radio Resource Control (RRC) messages regarding whether to use the SDAP layer device header or SDAP layer device functionality for each PDCP layer device, each bearer, or each logical channel. When the SDAP header is configured, the terminal can be instructed to use the Non-Access Stratum (NAS) reflected QoS 1-bit indicator and the Access Stratum (AS) reflected QoS 1-bit indicator in the SDAP header to update or reconfigure the uplink and downlink QoS flows and data bearer mapping information. According to embodiments of this disclosure, the SDAP header may include QoS flow ID information indicating QoS. According to embodiments of this disclosure, QoS information can be used as data processing priority, scheduling information, etc., to support smooth service.

[0094] The main functions of NR PDCP 4-05 and 4-40 may include, but are not limited to, the following:

[0095] -Header compression and decompression: ROHC only;

[0096] -Transmission of user data;

[0097] - Ordered delivery of upper-layer PDUs;

[0098] - Out-of-order delivery of upper-layer PDUs;

[0099] -PDCP PDU reordering is used for receiving;

[0100] - Duplicate detection of lower-level SDUs;

[0101] -Retransmission of PDCP SDU;

[0102] - Encryption and decryption; and / or

[0103] - SDU discarding based on timers.

[0104] In the above description, the reordering function of an NR PDCP device can refer to the function of rearranging PDCP PDUs received at the lower layer in order based on the PDCP sequence number (SN). The reordering function of an NR PDCP device can include transmitting data to the upper layer in the rearranged order, transmitting data directly regardless of order, recording lost PDCP PDUs by rearranging their order, reporting the status of lost PDCP PDUs to the transmitting end, and requesting retransmission of lost PDCP PDUs.

[0105] The main functions of NR RLC 4-10 and 4-35 may include, but are not limited to, the following:

[0106] -Transmission of upper-layer PDUs;

[0107] - Ordered delivery of upper-layer PDUs;

[0108] - Out-of-order delivery of upper-layer PDUs;

[0109] - Error correction via ARQ;

[0110] - Cascading, segmentation, and reassembly of RLC SDUs;

[0111] - Re-segmentation of RLC PDU;

[0112] - Reordering of RLC PDUs;

[0113] -Repeated detection;

[0114] - Protocol error detection;

[0115] -RLC SDU discarded; and / or

[0116] -RLC reconstruction.

[0117] In the above description, the in-order delivery function of an NR RLC device can refer to the function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer. When a single RLC SDU is divided into multiple RLC SDUs and multiple RLC SDUs are received, the in-order delivery function of the NR RLC device can include the function of rearranging and transmitting them.

[0118] The in-order delivery function of the NR RLC device may include the function of rearranging the received RLC PDUs based on the RLC sequence number (SN) or PDCP sequence number (SN), the function of recording lost RLC PDUs by rearranging the order, the function of reporting the status of lost RLC PDUs to the transmitting end, and the function of requesting retransmission of lost RLC PDUs.

[0119] When a lost RLC SDU exists, the in-order delivery function of the NR RLC device can include the ability to deliver only the RLC SDUs preceding the lost RLCSDU to the upper layer in sequence.

[0120] When there is a lost RLC SDU but the timer expires, the in-order delivery function of the NR RLC device can include the function of sequentially delivering all RLC SDUs received before the scheduled timer starts to the upper layer.

[0121] When there is a lost RLC SDU but the scheduled timer expires, the in-order delivery function of the NR RLC device can include the function of transmitting all RLC SDUs received up to that time to the upper layer.

[0122] NR RLC devices can process RLC PDUs in the order they are received, regardless of the order of serial number and sequence number, and can deliver the processed RLC PDUs to NR PDCP devices.

[0123] When an NR RLC device receives a segment, the NR RLC can receive segments stored in a buffer or received later, reconfigure these segments into a complete RLC PDU, and then deliver it to the NR PDCP device.

[0124] The NR RLC layer may not include cascading functionality, and this functionality can be performed in the NR MAC layer, or it can be replaced by multiplexed functionality of the NR MAC layer.

[0125] In the above description, the out-of-order delivery function of an NR RLC device can refer to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order. When a single RLC SDU is divided into multiple RLC SDUs and multiple divided RLC SDUs are received, the out-of-order delivery function of the NR RLC device can include the function of rearranging and transmitting the multiple divided RLC SDUs. The out-of-order delivery function of the NR RLC device can include the function of storing the PDCP SN or RLC SN of each received RLC PDU, arranging the RLC PDUs, and recording lost RLC PDUs.

[0126] NR MACs 4-15 and 4-30 can connect to several NR RLC layer devices configured in a single terminal, and the main functions of the NR MAC may include, but are not limited to, the following:

[0127] - Mapping between logical channels and transmission channels;

[0128] - MAC SDU multiplexing / demultiplexing;

[0129] - Scheduling information report;

[0130] - Error correction via HARQ;

[0131] - Priority processing between logical channels of a UE;

[0132] - Prioritize UEs through dynamic scheduling;

[0133] -MBMS service identifier;

[0134] -Transmission format selection; and / or

[0135] -filling.

[0136] NR Physical Layer (NR PHY) 4-20 and 4-25 can generate OFDM symbols by channel coding and modulation of upper-layer data and transmit the symbols via radio channels, or they can demodulate and decode OFDM symbols received via radio channels and transmit them to the upper layer.

[0137] Figure 5 The structure of a terminal in a wireless communication system according to an embodiment of the present disclosure is shown.

[0138] refer to Figure 5 The terminal may include a radio frequency (RF) processor 5-10, a baseband processor 5-20, a storage device 5-30, and a controller 5-40.

[0139] RF processor 5-10 can perform functions such as transmitting or receiving signals through a radio channel, including signal frequency band conversion and amplification. RF processor 5-10 can up-convert the baseband signal provided by baseband processor 5-20 into an RF band signal, then transmit the RF band signal through an antenna, and down-convert the RF band signal received through the antenna back into a baseband signal. For example, RF processor 5-10 may include, but is not limited to, transmit filters, receive filters, amplifiers, mixers, oscillators, digital-to-analog converters (DACs), and analog-to-digital converters (ADCs). Although... Figure 5 Only a single antenna is shown, but the terminal may include multiple antennas. Furthermore, the RF processor 5-10 may include multiple RF links. Additionally, the RF processor 5-10 can perform beamforming. To perform beamforming, the RF processor 5-10 can adjust the phase and amplitude of signals transmitted or received through multiple antennas or antenna elements. The RF processor 5-10 can also perform MIMO operation and can receive multi-layer data during MIMO operation.

[0140] The baseband processor 5-20 performs the conversion function between baseband signals and bitstreams according to the system's physical layer specifications. For example, during data transmission, the baseband processor 5-20 generates complex symbols by encoding and modulating the transmitted bitstream. Furthermore, during data reception, the baseband processor 5-20 can reconstruct the received bitstream by demodulating and decoding the baseband signal provided from the RF processor 5-10. For example, according to the Orthogonal Frequency Division Multiplexing (OFDM) scheme, during data transmission, the baseband processor 5-20 generates complex symbols by encoding and modulating the transmitted bitstream, maps the complex symbols to subcarriers, and then configures the OFDM symbols by performing an inverse Fast Fourier Transform (IFFT) operation and cyclic prefix (CP) insertion. Furthermore, during data reception, the baseband processor 5-20 can segment the baseband signal provided from the RF processor 5-10 into OFDM symbol units, reconstruct the signal mapped to the subcarriers by performing a Fast Fourier Transform (FFT) operation, and then reconstruct the received bitstream by demodulating and decoding the signal.

[0141] Baseband processor 5-20 and RF processor 5-10 transmit and receive signals as described above. Therefore, each of baseband processor 5-20 and RF processor 5-10 can also be referred to as a transmitter, receiver, transceiver, or communication unit. Furthermore, at least one of baseband processor 5-20 and RF processor 5-10 may include multiple communication modules to support a variety of different radio access technologies. Additionally, at least one of baseband processor 5-20 and RF processor 5-10 may include multiple communication modules to process signals in different frequency bands. For example, different radio access technologies may include wireless local area networks (LANs) (e.g., IEEE 802.11), cellular networks (e.g., LTE), etc. Furthermore, different frequency bands may include ultra-high frequency (SHF) bands (e.g., 2 GHz) and millimeter wave (mmWave) bands (e.g., 60 GHz).

[0142] Storage device 5-30 stores data used for terminal operation, such as basic programs, applications, configuration information, etc. Specifically, storage device 5-30 can store information related to a second connection node used for wireless communication via a second wireless connection technology. Furthermore, storage device 5-30 provides the stored data in response to requests from controller 5-40.

[0143] Controller 5-40 controls the overall operation of the terminal. For example, controller 5-40 transmits or receives signals via baseband processor 5-20 and RF processor 5-10. Furthermore, controller 5-40 records data on or reads data from storage device 5-30. For this purpose, controller 5-40 may include at least one processor. For example, controller 5-40 may include a communication processor (CP) for controlling communication and an application processor (AP) for controlling upper layers (such as applications).

[0144] In various embodiments, any one of the RF processors 5-10, the baseband processors 5-20, and the controllers 5-40 may include one or more processors or other processing devices to perform, direct, or control the disclosed functions.

[0145] Figure 6 The configuration of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0146] refer to Figure 6 The base station may include an RF processor 6-10, a baseband processor 6-20, a backhaul communication unit 6-30, a storage device 6-40, and a controller 6-50.

[0147] RF processor 6-10 can perform functions such as transmitting or receiving signals through a radio channel, including signal frequency band conversion and amplification. RF processor 6-10 up-converts baseband signals provided by baseband processor 6-20 to RF band signals and transmits the converted RF band signals through an antenna, and down-converts RF band signals received through the antenna back to baseband signals. For example, RF processor 6-10 may include transmit filters, receive filters, amplifiers, mixers, oscillators, DACs, ADCs, etc. Although... Figure 6 Only a single antenna is shown, but the RF processor 6-10 may include multiple antennas. Furthermore, the RF processor 6-10 may include multiple RF links. Additionally, the RF processor 6-10 can perform beamforming. To perform beamforming, the RF processor 6-10 can adjust the phase and amplitude of signals transmitted or received through multiple antennas or antenna elements. The RF processor 6-10 can perform downlink MIMO operation by transmitting data from one or more layers.

[0148] The baseband processor 6-20 can perform the conversion between baseband signals and bitstreams based on the physical layer specifications of the first radio access technology. For example, during data transmission, the baseband processor 6-20 can generate complex symbols by encoding and modulating the transmitted bitstream. Furthermore, during data reception, the baseband processor 6-20 can reconstruct the received bitstream by demodulating and decoding the baseband signal provided from the RF processor 6-10. For example, according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme, during data transmission, the baseband processor 6-20 generates complex symbols by encoding and modulating the transmitted bitstream, maps the complex symbols to subcarriers, and then configures the OFDM symbols by performing IFFT operations and CP insertion. Furthermore, during data reception, the baseband processor 6-20 can segment the baseband signal provided from the RF processor 6-10 into OFDM symbol units, reconstruct the signals mapped to subcarriers by performing FFT operations, and then reconstruct the received bitstream by demodulating and decoding these signals. The baseband processor 6-20 and the RF processor 6-10 can transmit and receive signals as described above. Therefore, each of the baseband processor 6-20 and the RF processor 6-10 can also be referred to as a transmitter, receiver, transceiver, communication unit, or wireless communication unit.

[0149] The backhaul communication unit 6-30 provides an interface for communicating with other nodes in the network. For example, the backhaul communication unit 6-30 can convert a bit stream sent from the primary base station to another node (e.g., a secondary base station, core network, etc.) into a physical signal, and can convert a physical signal received from another node into a bit stream.

[0150] Storage device 6-40 stores data used for main base station operation, such as basic procedures, applications, and configuration information. Storage device 6-40 can store information related to bearers allocated to connected terminals, measurement results reported from connected terminals, etc. Furthermore, storage device 6-40 can store information used to determine whether to provide multi-connectivity to terminals. Additionally, storage device 6-40 provides the stored data in response to requests from controller 6-50.

[0151] The controller 6-50 controls the overall operation of the base station. For example, the controller 6-50 transmits or receives signals via the baseband processor 6-20 and the RF processor 6-10 or via the backhaul communication unit 6-30. Furthermore, the controller 6-50 records data on or reads data from the storage device 6-40. For this purpose, the controller 6-50 may include at least one processor.

[0152] In various embodiments, any one of the RF processor 6-10, the baseband processor 6-20, and the controller 6-50 may include one or more processors or other processing devices to perform, direct, or control the disclosed functions.

[0153] Figure 5 Terminals and / or Figure 6 The base station in the system can perform the methods and / or embodiments provided in this disclosure. Furthermore, for example, the network control repeater described later may have [equipment / features] with [other features / functions]. Figure 5 Terminals or Figure 6 The base stations in the series have the same or similar structures.

[0154] Figure 7 The structure of a network control repeater (NCR) according to an embodiment of this disclosure is shown.

[0155] refer to Figure 7 The network control repeater 700 may include an NCR mobile terminal (MT) 710 and an NCR forwarder (FWD) 720. The NCR-MT 710 may receive control signals / information for NCR operation from the serving base station 730 and transmit such control signals / information to the NCR-FWD. The NCR-FWD 720 may amplify the RF signal received from the base station 730 and transmit the amplified RF signal to the terminal 740. The NCR-FWD 720 may perform additional operations using the control signals / information received from the NCR-MT 710. The NCR-FWD 720 may use a specific beam to transmit the amplified signal to the terminal or receive signals transmitted by the terminal. Furthermore, the NCR-FWD 720 may or may not receive / amplify / transmit signals from the base station or receive / amplify / transmit signals from the terminal according to a specific time division duplex (TDD) mode. In the following text, the NCR-MT may be referred to as MT, and the NCR-FWD may be referred to as FWD. In addition, the connection between the base station and the NCR-MT can be called the control link (C link), the connection between the base station and the NCR-FWD can be called the backhaul link, and the connection between the terminal and the NCR-FWD can be called the access link.

[0156] The operation of the NCR-FWD may be limited depending on the connection status between the NCR-MT and the C-link. Therefore, it is necessary to define the operation of the FWD based on the Radio Link Monitoring (RLM) operation of the C-link to the MT.

[0157] According to embodiments of this disclosure, the NCR-FWD shutdown operation can be defined as not performing at least one of the following detailed operations:

[0158] - NCR-FWD will not receive signals from the base station on the backhaul link;

[0159] - NCR-FWD will not amplify / transmit signals received on the access link; and / or

[0160] - Except for the symbol segment of the access link beam indicator configured with side control information (SCI) for NCR-FWD applications, NCR-FWD can be defined as off at other times.

[0161] Figure 8 An operation method of the T310 timer according to an embodiment of the present disclosure is shown.

[0162] When measuring the reference signal used for RLM measurements, if the measured signal strength exceeds a threshold associated with an in-sync indicator in each time interval, the UE or MT can send the synchronization indicator from the physical layer to the upper layer (e.g., RRC or MAC). Furthermore, within each time interval, if the measured value does not exceed a threshold associated with an out-of-sync indicator, the UE or MT can send an out-of-sync indicator. For example, if beam blocking occurs, or the link quality between the UE / MT and the base station deteriorates, and a pre-configured number (e.g., N310) of consecutive out-of-sync indicators are sent to the RRC layer, the T310 timer can be started. Similarly, if a pre-configured number (e.g., N311) of consecutive synchronization indicators are sent to the RRC layer while the T310 timer has already started, the T310 timer can be stopped. If the T310 timer runs to its end and expires, the UE or MT can declare a radio link failure (RLF).

[0163] From the perspective of NCR-MT, it can also operate in the same way as described above, and the T310 timer is started due to the loss of synchronization indicator received on the C link. This may indicate not only a temporary link failure of the beam currently used on the C link, but also a temporary link failure of the NCR backhaul beam based on the beam configuration on the corresponding C link.

[0164] Figure 9 An NCR-FWD operation method incorporating T310 timer operation is illustrated according to an embodiment of the present disclosure.

[0165] refer to Figure 9 If the RRC layer of the NCR-MT 910 continuously receives a pre-configured number (e.g., N310) of out-of-synchronization indicators from the PHY layer, the T310 timer can be started. Subsequently, during the operation of the T310 timer, if the RRC layer of the NCR-MT 910 continuously receives a pre-configured number (e.g., N311) of synchronization indicators from the PHY layer, the T310 timer can be stopped.

[0166] When the T310 timer starts, the NCR-MT 910 can instruct the FWD 920 to shut down. The shutdown instruction can be performed using one of the detailed methods shown in the following options.

[0167] In one example of Option 1, the RRC of the NCR MT can instruct the FWD to turn off when the T310 timer is started by the RRC of the NCR MT. Alternatively, the MT can implicitly instruct the FWD to turn off, or the FWD can turn off itself when the T310 starts.

[0168] In one example of Option 2, when the MT's RRC starts the T310 timer, the MT can release or remove the NCR-side control information received from the base station 930. In this case, the FWD shutdown operation may differ depending on the information being released or removed.

[0169] For example, in the NCR-side control information, if the operation configuration of the transmit / receive beams of the access link and the backhaul link is released or removed, the FWD can stop the receive and transmit operations.

[0170] For example, if the configuration information related to the access link beam is removed from the NCR side control information, the FWD can perform the receive operation from the base station / upper-level node, but can stop the transmit operation to the UE / lower-level node.

[0171] For example, if configuration information related to the backhaul link beam is removed from the NCR-side control information, the FWD can stop receiving operations from the base station / upper-level node, but can perform transmission operations to the UE / lower-level node.

[0172] For example, in the NCR-side control information, if the aperiodic beam-related configuration of the access link is removed, the FWD can only stop the aperiodic beam-related operation, excluding the semi-persistent / periodic beam operation. Here, the aperiodic beam of the access link is an example, and this operation can be similarly applied to the semi-persistent / periodic beam.

[0173] In one example, options 1 and 2 can also be combined. For instance, when the T310 timer starts, the MT's RRC can instruct the FWD to shut down and specify the release / removal configuration information in the side control information as details and send it to the FWD.

[0174] After disabling the FWD according to the T310 timer operation described above, there are two methods to restore the FWD.

[0175] In one example of Method 1, a method is used to restore FWD on by recognizing T310 stopped operation via MT.

[0176] When the T310 timer on the C-link in the MT stops, the MT can instruct the FWD to turn on. This instruction to turn on may correspond to option 1, which instructs the FWD to turn off. Specifically, the MT can instruct to turn on via the RRC signal, implicitly instruct the FWD to turn on, or the FWD can turn on itself when the T310 timer stops.

[0177] In this scenario, the FWD can operate using the most recent side control information (i.e., the most recent side control information prior to T310 startup). Specifically, the FWD can operate using the following configuration information:

[0178] • Use access link beam configuration:

[0179] - For periodic beams: FWD can forward (recover) the received signal on each indicated beam and its corresponding time resources (symbol positioning in time and the duration of the forwarded symbol), and / or

[0180] - For aperiodic beams: The beam most recently indicated by the DCI (before the BF) can be used to forward the received signal, using the time resources configured before the BF;

[0181] • Use backhaul link beam configuration:

[0182] - Semi-static beamforming: FWD can use a UL / DL beam indicated by MAC CE before BF, and / or

[0183] - Adaptive beaming: FWD uses the latest beam indicated by MAC CE and / or DCI for adaptive beaming before BF; and / or.

[0184] • All time resources to be used are after the BFR indicated time.

[0185] If the previous FWD shutdown operation was performed based on option 2 (e.g., if specific configuration information of the side control information has been released), then method 1 described above may not be used. In other words, if the FWD shutdown operation was performed based on option 1, then method 1 described above can be used when the FWD is restarted.

[0186] The above solution may be a handling method for when the T310 timer stops upon receiving a continuous synchronization indicator. In cases where the T310 stops due to other conditions, such as the following, the FWD can be kept off instead of on:

[0187] -Received a switching (HO) indicator,

[0188] -Received Radio Access Technology (RAT) HO indicator

[0189] -Performance of conditional reconfiguration

[0190] - During the reconfiguration of rlf-TimersAndConstant,

[0191] - When initiating an RRC reconstruction, and / or

[0192] - During the primary cell group (MCG) failure information process.

[0193] Figure 10 A method for restoring FWD on operation according to an embodiment of the present disclosure is shown.

[0194] Figure 10 The operations described can be performed based on Option 1 and Method 1 mentioned above. (See reference) Figure 10 The startup operation can be restored using the FWD configuration information maintained by the NCR node.

[0195] refer to Figure 10 In operation S1001, NCR-MT 1010 can receive side control information from base station 1030. In operation S1002, if the RRC layer of NCR-MT 1010 continuously receives a pre-configured number (e.g., N310) of out-of-synchronization indicators from the PHY layer, timer T310 can be started. In operation S1003, when timer T310 is started, NCR-MT 1010 can instruct FWD 1020 to turn off. This turn-off instruction can be based on option 1 above. In operation S1004, if the RRC layer of NCR-MT 1010 continuously receives a pre-configured number (e.g., N311) of synchronization indicators from the PHY layer during the operation of timer T310, timer T310 can be stopped. In operation S1005, when timer T310 is stopped, NCR-MT 1010 can instruct FWD 1020 to turn on FWD. In this case, during operation S1006, FWD 1020 can operate the FWD using the latest side control information (i.e., the latest side control information before T310 starts).

[0196] An example of Method 2, a method for restoring FWD from the network.

[0197] If the MT detects that the T310 timer has stopped, the FWD can remain off regardless of the stop point. However, after the T310 timer stops, the network provides separate side control information, and the FWD can be restarted.

[0198] Depending on the type of side control information sent, FWD can perform the following operations:

[0199] - New side control information for access link configuration via DL RRC messages (msg):

[0200] In this case, the beam indicated by the periodic beam of the access link can be turned on within the indicated time.

[0201] - New side control information for backhaul link configuration via DL RRC msg:

[0202] In this case, the beam indicated by the semi-static beam of the backhaul link can be turned on within the indicated time; and / or

[0203] - In cases where the MT is configured with MAC CE / DCI to use a specific beam, where the beam configuration used on the existing C link has been sent to the RRC, or where a new C link beam configuration has been sent to the MT via the RRC after the T310 timer stops, the beam currently used on the C link can be used as a semi-static and / or adaptive beam for the NCR backhaul link, even if a separate MAC CE and / or DCI for the semi-static beam of the backhaul link is not received.

[0204] In addition, the beam configuration information for each access link and backhaul link can be followed in detail as follows:

[0205] • Use access link beam configuration:

[0206] - For periodic / semi-persistent beams: FWD can be resumed after T310 stop via a new (first) RRC msg with a newly configured beam and corresponding time resources, and / or

[0207] - For aperiodic beams: Use the beam indicated by the newly received DCI after the T310 stop, and this beam is also in the beam set indicated by the RRC message received after the T310 stop; and / or

[0208] • Use backhaul link beam configuration:

[0209] - Semi-static beamforming: FWD can use the UL / DL beam indicated by the MAC CE received after T310 stops, and / or

[0210] - Adaptive beaming: FWD can use the beam indicated by the MAC CE and / or DCI received after the T310 stops.

[0211] In addition, after the T310 timer stops, the MT can send a signal to the base station that includes and / or indicates that a temporary link failure has occurred and / or that the temporary link failure has been recovered. This signal can be sent via a UL RRC message, a UL MAC CE, or an uplink control information (UCI). The base station receiving this signal can then send the new backhaul link and / or access link configuration information to the MT.

[0212] According to another embodiment, when FWD is off, if the MT has not removed the existing side control information configuration information (Option 1), the network can indicate an FWD enable indicator to the terminal via DL RRC, DL MAC CE, or DCI. In this case, FWD enable can be restored by applying the latest side control information as the access / backhaul beam configuration.

[0213] If the MT receives new side control information from the network or an indication / message to enable the FWD, the MT can indicate that the FWD is enabled or re-enabled via a separate signal (e.g., RRC).

[0214] Figure 11 Another method for restoring FWD on operation according to embodiments of this disclosure is shown.

[0215] Figure 11 The operations can be performed based on option 2 and method 2 mentioned above.

[0216] refer to Figure 11In operation S1101, NCR-MT 1110 can receive side control information from base station 1130. In operation S1102, if the RRC layer of NCR-MT 1110 continuously receives a pre-configured number (e.g., N310) of out-of-synchronization indicators from the PHY layer, timer T310 can be started. In operation S1103, when timer T310 is started, NCR-MT 1110 can instruct FWD 1120 to shut down. This shutdown instruction can be performed based on option 1 or option 2 described above. In operation S1104, if the RRC layer of NCR-MT 1110 continuously receives a pre-configured number (e.g., N311) of synchronization indicators from the PHY layer while timer T310 is running, timer T310 can be stopped. In this case, FWD 1120 can remain off. In operation S1105, NCR-MT 1110 can send information about temporary link failure to base station 1130. In some cases, operation S1105 may be omitted. In operation S1106, base station 1130 may send new side control information to NCR-MT 1110. If new side control information is received after timer T310 stops, FWD 1120 may resume operation. For example, in operation S1107, NCR-MT 1110 may instruct FWD 1102 to activate FWD. In some cases, operation S1107 may be omitted. In operation S1108, FWD 1120 may use the latest side control information to operate FWD.

[0217] The following sections provide methods for enabling / disabling FWD based on various MT states, as well as methods for maintaining or releasing associated FWD configuration information.

[0218] When FWD is disabled or a shutdown operation is performed, if specific or all configuration information related to FWD is released and sent when the network sends Side Control Information (SCI), FWD can consider a situation where no configuration is operated for a specific period of time as a shutdown operation.

[0219] Furthermore, as in the T310 scenario described above, there may be cases where the FWD is shut down by the MT itself, not the network. In such cases of self-shutdown, it can be determined whether to store or release the network's SCI configuration in the MT, FWD, or NCR node.

[0220] Since most MT autonomous shutdowns occur when the C-link fails to receive SCI directly from the network, SCI may not be received immediately upon transitioning from shutdown to startup (e.g., the network may not recognize the C-link problem). Therefore, to quickly restore FWD operation and enable service on the service terminal, the MT, FWD, or NCR node can maintain SCI or FWD-related configuration information even when the MT is in an autonomous shutdown state. This operation can be applied in the following situations:

[0221] - When FWD is off, MT detects a beam failure on the C link;

[0222] - When FWD is off, the T310 timer is started during RLM on the C link of MT.

[0223] - When the MT transitions to an inactive / idle state, or after the transition is executed, the cell reselection to a cell that is not a cell that has already received SCI in the existing connectivity mode; or

[0224] - When declaring an RLF.

[0225] Figure 12 A method for maintaining configuration information for the on / off state of FWD according to embodiments of the present disclosure is shown.

[0226] refer to Figure 12 When an SCI is received while the FWD is in the on state (1201), the FWD remains on. When an SCI is released while the FWD is on, the FWD becomes off without an SCI (1202). When an SCI is received while the FWD is off without an SCI, the FWD can become on again (1201). When a MT autonomous shutdown operation is performed while the FWD is on (1201) (e.g., beam failure detection (BFD), T310 starts, reselects to another cell), the FWD becomes off (1203), and in this case, the SCI of the FWD can be retained as provided in this disclosure. In this state, when the MT autonomous shutdown operation resumes (e.g., beam failure recovery (BRF) is completed, T310 stops), the FWD can be returned to the on state (1201) based on the retained SCI.

[0227] In the configuration information included in the SCI, the beams and beam usage time information of the backhaul link and access link indicated by RRC are configured to indicate FWD activation. However, when FWD is disabled, the beams and beam usage time information in the corresponding SCI configuration information can be considered disabled until FWD is reactivated based on the existing configuration information.

[0228] Table 1 shows an example of parameters for configuring periodic forwarding resources.

[0229] For example, in the case of periodic beams within the access link beam, the initial configured on / off time / resources may be subject to additional limitations during the on / off operation due to the FWD's off operation. For instance, if the MT indicates FWD off, even if "beamIndex" is indicated, it can be assumed that the NCR-FWD is in an off state before indicating FWD on.

[0230] [Table 1]

[0231] In an embodiment, the instruction message for the RRC operation of the NCR-MT, as instructed by the network, may include FWD configuration information or an indicator for retaining or releasing SCI, and is sent to the MT. For example, if the RCRelease message or the RCRelease message with suspendConfig includes an indicator for releasing or retaining NCR configuration information, FWD configuration information, or SCI, and is sent to the MT, then the MT may release or retain the corresponding configuration information when transitioning to idle mode or inactive mode. For reference, in idle mode, all radio resource-related information of the MT is released. In this case, the FWD configuration information may not be released. Subsequently, in the case of the MT reselecting from one cell to another, the operation of releasing the FWD configuration information can be performed as an internal operation of the MT.

[0232] Figure 13 A flowchart of an NCR method according to an embodiment of this disclosure is shown.

[0233] refer to Figure 13 NCR can include NCR-MT and NCR-FWD, similar to the above. Figure 7 The NCR structure in [the context]. Figure 13 The order of operations can be changed, and some operations can be omitted, or two or more operations can be combined and executed as a single operation.

[0234] In operation S1310, the NCR can receive side control information from the base station. The side control information may include FWD configuration information. For example, the side control information may include the configuration of periodic resources for forwarding, and the configuration of periodic resources may include beam index and / or duration in symbols parameters. For example, the side control information can be received via the control link between the base station and the NCR-MT.

[0235] In operation S1320, the NCR can identify that forwarding by the NCR-FWD has stopped. Forwarding stop (i.e., FWD off) can be indicated to the NCR-FWD based on at least one of options 1 and 2 described above. For example, if a beam failure is detected in the NCR-MT, the NCR-FWD can be instructed to stop forwarding based on the beam failure detection. If forwarding stops, the NCR-FWD can stop at least one of transmission and reception on the backhaul link and transmission and reception on the access link.

[0236] If forwarding stops based on beam failure detection, the NCR can perform a beam failure recovery procedure in operation S1330.

[0237] In operation S1340, NCR-FWD can be enabled and forwarding can be resumed. For example, NCR can resume forwarding based on side control information received before beam failure detection.

[0238] The embodiments and methods described above can be combined with each other.

[0239] The methods of the various embodiments described in the claims or specification of this disclosure can be implemented in hardware, software, or a combination of hardware and software.

[0240] When these methods are implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within an electronic device. At least one program may include instructions to cause the electronic device to perform the methods of various embodiments of this disclosure, as defined in the appended claims and / or disclosed herein.

[0241] Programs (software modules or software) can be stored in non-volatile memory, including RAM and flash memory, ROM, electrically erasable programmable read-only memory (EEPROM), disk storage devices, CD-ROMs, DVDs, other types of optical storage devices, or magnetic tape. Alternatively, any combination of some or all of these storage devices can form the memory in which the program is stored. Furthermore, multiple such memories can be included in an electronic device.

[0242] Furthermore, the program can be stored on a connectable storage device that can access the electronic device via a communication network such as the Internet, intranet, local area network (LAN), wide area network (WLAN), and storage area network (SAN), or a combination thereof. This storage device can access the electronic device via an external port. Additionally, a separate storage device on the communication network can access portable electronic devices.

[0243] In the specific embodiments of this disclosure described above, the components included in this disclosure are represented in singular or plural form depending on the specific embodiment presented. However, the choice of singular or plural representation is for ease of explanation and adaptation to the presented situation, and this disclosure is not limited to singular or plural components; even components expressed in plural form may consist of a singular component, and even components expressed in singular form may consist of multiple elements.

[0244] Furthermore, specific embodiments have been described in the detailed description of this disclosure; however, various modifications can, of course, be made 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 determined not only by the scope of the claims set forth below, but also by the scope of those claims and their equivalents.

[0245] Although this disclosure has been described in conjunction with various embodiments, various changes and modifications may be proposed by those skilled in the art. This disclosure is intended to cover such changes and modifications that fall within the scope of the appended claims.

Claims

1. A method performed by an NCR (Network Control Repeater) mobile terminal (NCR-MT) and an NCR forwarder (NCR-FWD) in a wireless communication system, the method comprising: Control information is received from the base station by the NCR-MT; Beam detection for NCR-MT failed; The NCR-FWD stops forwarding based on beam failure detection; Identify the completion of beam failure recovery; as well as Based on the completion of beam failure recovery, the forwarding is resumed using the side control information received before the beam failure was detected.

2. The method according to claim 1, in, Side control information is received via the control link between the base station and the NCR-MT.

3. The method according to claim 1, wherein, Side control information includes configuration information for periodically forwarding resources, and The configuration information includes a beam index that indicates the logical beam index of the NCR-FWD access link.

4. The method according to claim 3, wherein, When forwarding stops, NCR-FWD is disabled regardless of the beam index.

5. The method according to claim 1, further comprising: Information about the downlink beam and uplink beam is received via Media Access Control-Control Element (MAC-CE) signaling for the backhaul link. The backhaul link connects the base station to the NCR-FWD of the NCR.

6. The method according to claim 5, wherein, In the event of forwarding stoppage, at least one of the following will stop: transmission on the backhaul link and transmission on the access link between the terminal and the NCR-FWD.

7. A method performed by a base station in a wireless communication system, the method comprising: Side control information is sent to the NCR, including the Network Control Repeater (NCR) Mobile Terminal (NCR-MT) and the NCR Forwarder (NCR-FWD). Among these, forwarding is stopped based on beam failure detection between the base station and the NCR-MT. Among them, beam failure recovery is performed between the base station and the NCR, and In this process, the forwarding is based on the completion of beam failure recovery, which uses the side control information sent before beam failure detection to recover.

8. The method according to claim 7, in, Side control information is transmitted via the control link between the base station and the NCR-MT of the NCR.

9. The method according to claim 7, wherein, Side control information includes configuration information for periodically forwarding resources, and The configuration information includes a beam index that indicates the logical beam index of the access link connected to the NCR-FWD.

10. The method of claim 7, further comprising: Information regarding the downlink beam and the uplink beam for the backhaul link is sent to the NCR via Media Access Control-Control Element (MAC-CE) signaling. The backhaul link connects the base station to the NCR-FWD of the NCR.

11. A network control repeater (NCR) in a wireless communication system, comprising an NCR mobile terminal (NCR-MT) and an NCR forwarder (NCR-FWD), wherein the NCR includes: transceiver; and At least one processor is configured as follows: Receive control information from the base station. Beam detection for NCR-MT failed. Stop forwarding based on beam failure detection. Identify the completion of beam failure recovery, and Based on the completion of beam failure recovery, the forwarding is resumed using the side control information received before the beam failure was detected.

12. The NCR according to claim 11, wherein, Side control information includes configuration information for periodically forwarding resources. The configuration information includes the beam index indicating the logical beam index of the NCR-FWD access link, and In cases where forwarding stops, NCR-FWD is disabled regardless of the beam index.

13. The NCR of claim 11, wherein, The at least one processor is also configured to receive information about the downlink beam and the uplink beam for the backhaul link via Media Access Control-Control Element (MAC-CE) signaling, and The backhaul link connects the base station to the NCR-FWD of the NCR.

14. A base station (BS) in a wireless communication system, the BS comprising: transceiver; and At least one processor is configured as follows: Side control information is sent to the NCR, including the Network Control Repeater (NCR) Mobile Terminal (NCR-MT) and the NCR Forwarder (NCR-FWD). Among these, forwarding is stopped based on beam failure detection between the base station and the NCR-MT. Among them, beam failure recovery is performed between the base station and the NCR, and In this process, the forwarding is based on the completion of beam failure recovery, which uses the side control information sent before beam failure detection to recover.

15. The BS according to claim 14, wherein, Side control information includes configuration information for periodically forwarding resources, and The configuration information includes a beam index that indicates the logical beam index of the access link connected to the NCR-FWD.

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