Apparatus and method for initial access of network control repeater in next generation wireless communication system

Abstract

The present disclosure relates to: a communication technology that fuses an Internet of Things (IoT) technology with a 5G communication system to support a higher data transmission rate than a 4G system; and a system for this purpose. The present disclosure may be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, safety-related services, etc. The present disclosure provides an apparatus and method related to a network control repeater system.

Description

Technical Field

[0001] The present disclosure relates to a network controlled repeater system. Background Art

[0002] In order to meet the growing demand for wireless data traffic since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also called "super 4G networks" or "post-long term evolution (LTE) systems". 5G communication systems are considered to be implemented in extremely high frequency (millimeter wave) bands, such as the 60 GHz band, in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technologies are discussed and adopted in 5G communication systems. In addition, in 5G communication systems, development work is being carried out on system network improvements based on technologies such as advanced cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), and receiving-end interference cancellation. In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM) technologies, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) technologies have been developed as advanced access technologies.

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

[0004] To this end, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications are being implemented based on 5G communication technologies such as beamforming, MIMO, and array antennas. The application of cloud radio access networks (cloud RAN) in big data processing technology is an example of the convergence of 5G technology and IoT technology.

[0005] With the development of the above-mentioned mobile communication systems, various services have become available, and thus a scheme capable of efficiently providing these services is required. Summary of the invention

[0006]

Technical issues

[0007] The present disclosure aims to provide a method for a network-controlled repeater to perform network access and be configured with necessary operations.

[0008] Furthermore, the present disclosure is directed to providing an apparatus and method capable of effectively providing a service in a mobile communication system.

[0009]

Technical solution

[0010] According to an embodiment of the present disclosure, a method for a terminal in a wireless communication system may include: receiving system information from a base station; checking whether the system information includes an indicator indicating support for a network controlled repeater (NCR); and based on the indicator included in the system information, sending a random access preamble code for a random access process to the base station, wherein the terminal may be a terminal supporting the NCR function.

[0011] In addition, according to an embodiment of the present disclosure, a method of a base station in a wireless communication system may include: generating an indicator indicating support for a network controlled repeater (NCR); broadcasting system information including the indicator; and receiving a random access preamble code based on the system information from a terminal.

[0012] In addition, according to an embodiment of the present disclosure, a terminal in a wireless communication system may include: a transceiver; and a controller, the controller controlling the transceiver to receive system information from a base station, checking whether the system information includes an indicator indicating support for a network controlled repeater (NCR), and based on the system information including the indicator, controlling the transceiver to send a random access preamble code for a random access process to the base station, wherein the terminal may be a terminal supporting the NCR function.

[0013] In addition, according to an embodiment of the present disclosure, a base station in a wireless communication system may include: a transceiver; and a controller, the controller generating an indicator indicating support for a network controlled repeater (NCR), controlling the transceiver to broadcast system information including the indicator, and controlling the transceiver to receive a random access preamble based on the system information from a terminal.

[0014] [Beneficial effects of the invention]

[0015] According to an example of the present disclosure, a specific method may be provided in which a network controls a repeater to attempt to access a base station and operates by receiving necessary configuration information from the network.

[0016] Specifically, according to an example of the present disclosure, after distinguishing between a cell in which the controlled repeater can be operated and a cell in which the controlled repeater cannot be operated, when the network-controlled repeater accesses the serving cell, the serving cell performs a selective access permission operation, and after the controlled repeater accesses, performs an operation of notifying the cell that it is a network-controlled repeater. Thus, the following effect is produced: a signal for controlling the controlled repeater can be correctly transmitted / received between the cell and the network-controlled repeater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of an LTE system according to an embodiment of the present disclosure is shown.

[0018] Figure 2 A schematic diagram of the wireless protocol structure in an LTE system according to an embodiment of the present disclosure is shown.

[0019] Figure 3 A schematic structural diagram of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0020] Figure 4 A schematic diagram of the wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0021] Figure 5 A block diagram showing the internal structure of a UE according to an embodiment of the present disclosure.

[0022] Figure 6 A block diagram showing the configuration of a base station according to an embodiment of the present disclosure.

[0023] Figure 7 A schematic diagram showing the configuration of a network controlled repeater according to an embodiment of the present disclosure.

[0024] Figure 8a The flowchart shows a method in which the NCR-MT uses the RRCSetupComplete message to notify that it is an NCR entity.

[0025] Figure 8b The flowchart shows a method in which the NCR-MT uses the RRCSetupComplete message to notify that it is an NCR entity.

[0026] Figure 9aThe flowchart shows a method in which the NCR-MT uses the RRCSetupRequest message to notify that it is an NCR entity.

[0027] Figure 9b The flowchart shows a method in which the NCR-MT notifies that it is an NCR entity by using an RRCSetupRequest message. DETAILED DESCRIPTION

[0028] The operating principle of the present disclosure will be described in detail below in conjunction with the accompanying drawings. In the following description of the present disclosure, if a detailed description of a known function or configuration would make the subject matter of the present disclosure unnecessarily vague, its detailed description will be omitted. The terms to be described below are defined according to their functions in the present disclosure, and these terms may vary depending on the user, the user's intention or customary usage. Therefore, the definitions of these terms should be determined based on the content of the entire specification.

[0029] In the following description, the terms used to identify access nodes, the terms used to refer to network entities, the terms used to refer to messages, the terms used to refer to interfaces between network entities, the terms used to refer to various identification information, etc. are used exemplarily for the convenience of description. Therefore, the present disclosure is not limited to the terms used below, and other terms used to refer to subjects with equivalent technical meanings may also be used.

[0030] Hereinafter, for the convenience of description, the present disclosure will use the terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to these terms and names, and can be applied in the same manner to systems conforming to other standards.

[0031] The effects and features of the present disclosure and the ways to achieve them will become apparent through the following embodiments described in conjunction with the accompanying drawings. The present disclosure can be embodied in many different forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to make the present disclosure complete and comprehensive and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure is defined only by the scope of the appended claims. Throughout the specification, the same reference numerals refer to the same constituent elements.

[0032] It should be understood that each box in the flowchart and the combination of boxes in the flowchart can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a device for realizing the function specified in the flowchart box. These computer program instructions can also be stored in a computer-usable memory or a computer-readable memory, which can instruct the computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-usable memory or the computer-readable memory generate a product including an instruction device, which realizes the function specified in the flowchart box. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operation steps are performed on the computer or other programmable device, thereby generating a process implemented by a computer, so that the instructions executed on the computer or other programmable device provide steps for realizing the function specified in the flowchart box.

[0033] In addition, each block in the flowchart illustration may represent a module, code segment, or portion of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions noted in the blocks may occur in a different order. For example, two consecutively displayed blocks may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order, depending on the functions involved.

[0034] In this article, the term "unit" refers to a software element or a hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). However, the meaning of the term "unit" is not always limited to software or hardware. A "unit" can be constructed to be stored in an addressable storage medium or to be constructed to execute one or more processors. Therefore, a "unit" includes but is not limited to software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided by elements and units can be combined into the functions of a smaller number of elements and units, or separated into the functions of a larger number of elements and units. In addition, these elements and units can be implemented to operate on one or more central processing units (CPUs) within a device or a secure multimedia card. In addition, in some embodiments, a unit may include one or more processors.

[0035] In the following description of the present disclosure, if it is considered that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present disclosure, the detailed description will be omitted. Embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0036] In the following description, terms used to identify access nodes, terms used to refer to network entities, terms used to refer to messages, terms used to refer to interfaces between network entities, terms used to refer to various identification information, etc. are used as examples for the convenience of description. Therefore, the present disclosure is not limited to the terms used below, and other terms used to refer to subjects with equivalent technical meanings may also be used. For example, in the following description, the term terminal may refer to a MAC entity in a terminal present in each of a primary cell group (MCG) and a secondary cell group (SCG) described below.

[0037] Hereinafter, for the convenience of description, the present disclosure will use terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to these terms and names, and can be applied to systems conforming to other standards in the same manner.

[0038] Hereinafter, a base station refers to an entity that performs resource allocation for a terminal, and may be at least one of a gNode B (gNB), an eNodeB (eNB), a Node B, a base station (BS), a wireless access unit, a base station controller, or a node in a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Of course, it is not limited to the above examples.

[0039] In particular, the present disclosure may be applied to 3GPP NR (fifth generation mobile communication standard). In addition, the present disclosure may be applied to smart services based on 5G communication technology and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security-related services, etc.). In the present disclosure, for ease of explanation, eNB may be used interchangeably with gNB. That is, a base station described as eNB may represent gNB. In addition, the term terminal may represent mobile phones, NB-IoT devices, sensors, and other wireless communication devices.

[0040] Beyond the systems that initially provided voice services, wireless communication systems are evolving into broadband wireless communication systems that provide high-speed and high-quality packet data services, like communication standards such as 3GPP High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE) (or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-advanced (LTE-A), 3GPP2's High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), and IEEE 802.16e.

[0041] In the LTE system, which is a representative example of a broadband wireless communication system, the downlink (DL) adopts an orthogonal frequency division multiplexing (OFDM) scheme, and the uplink (UL) adopts a single carrier frequency division multiple access (SC-FDMA) scheme. The uplink refers to a wireless link in which a terminal (user equipment (UE) or mobile station (MS)) sends data or a control signal to a base station (eNodeB or BS), while the downlink refers to a wireless link in which a base station sends data or a control signal to a terminal. The above-mentioned multiple access schemes generally allocate and operate time-frequency resources (through which data or control information is sent) so that they do not overlap for each user, that is, orthogonality is established, thereby distinguishing the data or control information of each user.

[0042] The 5G communication system is a communication system after LTE. It should be able to freely reflect the various needs of users and service providers, and should also support services that can meet various needs at the same time. The services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable low latency communication (URLLC), etc.

[0043] According to some embodiments, eMBB is intended to provide an improved data transmission rate over the data transmission rate supported by the existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, from the perspective of a base station, eMBB should be able to provide a peak data rate of 20Gbps in the downlink and a peak data rate of 10Gbps in the uplink. In addition, the 5G communication system needs to provide not only a peak data rate, but also an increase in the user-perceived data rate. In order to meet these requirements, various transmission / reception technologies including more advanced multiple-input multiple-output (MIMO) transmission technologies need to be improved. In addition, LTE uses a maximum transmission bandwidth of 20MHz in the 2GHz band to transmit signals, while the 5G communication system uses a frequency bandwidth of more than 20MHz in the 3-6 GHz or above 6GHz band to meet the required data rate.

[0044] Meanwhile, in 5G communication systems, mMTC for supporting application services such as the Internet of Things (IoT) is being considered. In order to efficiently provide IoT, mMTC needs to support a large number of UE accesses within a cell, improve UE coverage, improve battery life, reduce UE costs, etc. Since IoT is attached with various sensors and devices to provide communication functions, a large number of UEs (e.g., 1,000,000 UEs per square kilometer) should be supported within a cell. In addition, since UEs supporting mMTC are likely to be located in shadow areas that cannot be covered by the cell, such as the basement of a building, mMTC may require a wider coverage area compared to other services provided by the 5G communication system depending on the service characteristics. UEs supporting mMTC should be implemented at low cost and may require a very long battery life, such as 10 to 15 years, because it is difficult to frequently replace the battery of the UE.

[0045] Finally, URLLC is a cellular-based wireless communication service for specific purposes (mission-critical). For example, services such as remote control of robots or mechanical equipment, industrial automation, drones, remote healthcare, emergency alerts, etc. can be considered. Therefore, the communication provided by URLLC should have very low latency and very high reliability. For example, services supporting URLLC should meet the air interface latency of less than 0.5 milliseconds and have a packet error rate of no more than 10 -5 Therefore, for services supporting URLLC, the 5G system should provide a smaller transmission time interval (TTI) than other services, and may also need to be designed to allocate wider resources in the frequency band to ensure the reliability of the communication link.

[0046] The three services considered in the above-mentioned 5G communication system, namely, eMBB, URLLC and mMTC, can be multiplexed and transmitted in one system. In this case, these services can use different transmission / reception technologies and parameters to meet the different needs of their respective services. However, the above-mentioned mMTC, URLLC and eMBB are only examples of different service types, and the service types applied by the present disclosure are not limited to the above examples.

[0047] In addition, although the embodiments of the present disclosure are described below using LTE, LTE-A, LTE Pro or 5G (or NR, next generation mobile communication) systems as examples, the embodiments of the present disclosure can be applied to other communication systems with similar technical backgrounds or channel types. In addition, the embodiments of the present disclosure can be applied to other communication systems after some modifications by a person with skilled technical knowledge without significantly departing from the scope of the present disclosure.

[0048] Figure 1 A structural schematic diagram of an LTE system according to an embodiment of the present disclosure is shown.

[0049] Reference Figure 1 , the wireless access network of the LTE system may include next generation evolved Node Bs (hereinafter referred to as evolved Node Bs (ENBs), Node Bs or base stations) 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 1-35 (hereinafter referred to as UE or terminal) may access external networks through eNBs 1-05 to 1-20 and S-GW 1-30.

[0050] exist Figure 1 In the LTE system, the ENB 1-05 to 1-20 may correspond to a conventional Node B in a Universal Mobile Telecommunications System (UTMS). The ENB is connected to the UE 1-35 through a wireless channel and may perform a more complex role than a conventional Node B. In the LTE system, all user traffic including real-time services such as Voice over IP (VoIP) over Internet Protocol is provided through a shared channel. Therefore, a device for collecting and scheduling information about the buffer status, available transmission power status, and channel status of the UE is required, and the ENB 1-05 to 1-20 may serve as such a device. Typically, one ENB may control multiple cells. For example, in order to achieve a transmission rate of 100 Mbps, the LTE system may use Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology within a bandwidth of 20 MHz. In addition, the ENB may apply an Adaptive Modulation and Coding (AMC) scheme to determine a modulation scheme and a channel coding rate according to the channel status of the UE. The S-GW 1-30 is a device for providing a data bearer and may generate or remove a data bearer under the control of the MME 1-25. The MME not only performs a function of managing UE mobility but also performs various control functions and may be connected to multiple ENBs.

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

[0052] Reference Figure 2 In each of the UE and the ENB, the wireless protocol of the LTE system may include: Packet Data Convergence Protocol (PDCP) 2-05 or 2-40, Radio Link Control (RLC) 2-10 or 2-35, Medium Access Control (MAC) 2-15 or 2-30. PDCP can perform the operation of compressing / decompressing the Internet Protocol (IP) header. The main functions of PDCP can be summarized as follows. Of course, it is not limited to the following examples.

[0053] – Header compression and decompression function (Header compression and decompression: ROHC only)

[0054] – User data transmission function (transmission of user data)

[0055] – In-sequence delivery functionality (in-sequence delivery of upper layer PDUs during PDCP re-establishment procedure for RLC AM)

[0056] – Reordering functionality (for offload bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0057] – Duplicate detection function (duplicate detection of lower layer SDUs during PDCP re-establishment for RLC AM)

[0058] – Retransmission functionality (retransmission of PDCP SDUs at handover and, for offloaded bearers in DC, retransmission of PDCP PDUs during PDCP data recovery procedure for RLC AM)

[0059] – Encryption and decryption functions (encryption and decryption)

[0060] – Timer-based SDU removal functionality (timer-based SDU discard in uplink)

[0061] According to the embodiment, the radio link control (RLC) 2-10 or 2-35 reconfigures the PDCP packet data unit (PDU) to have an appropriate size and performs an automatic repeat request (ARQ) operation, etc. The main functions of the RLC can be summarized as follows. Of course, it is not limited to the following examples.

[0062] – Data transmission function (transmission of upper layer PDU)

[0063] – ARQ function (error correction via ARQ (only for AM data transmission))

[0064] – Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU (only for UM and AM data transmission))

[0065] – Resegmentation function (resegmentation of RLC data PDU (only for AM data transmission))

[0066] – Reordering function (reordering of RLC data PDUs (only for UM and AM data transmission))

[0067] – Duplicate detection function (Duplicate detection (only for UM and AM data transmission))

[0068] – Error detection function (protocol error detection (for AM data transmission only))

[0069] – RLC SDU deletion function (RLC SDU discard (only for UM and AM data transmission))

[0070] – RLC re-establishment function (RLC re-establishment)

[0071] According to the embodiment, MAC 2-15 or 2-30 is connected to various RLC layer devices equipped in one user equipment, and performs operations of multiplexing RLC PDU to MAC PDU and demultiplexing RLC PDU from MAC PDU. The main functions of MAC can be summarized as follows. Of course, it is not limited to the following examples.

[0072] – Mapping function (mapping between logical channels and transport channels)

[0073] – Multiplexing and demultiplexing functions (multiplexing / demultiplexing MAC SDUs belonging to one or more different logical channels into / from transport blocks (TBs) which are delivered to / from the physical layer on transport channels)

[0074] – Dispatch information reporting function (dispatch information reporting)

[0075] – HARQ (Hybrid Automatic Repeat Request) functionality (error correction via HARQ)

[0076] – Logical channel priority control function (priority handling between logical channels of a UE)

[0077] – UE priority control function (realizing priority processing between UEs through dynamic scheduling)

[0078] – MBMS service identification function (MBMS service identification)

[0079] – Transmission format selection function (Transmission format selection)

[0080] – Filling function (filling)

[0081] According to an embodiment, the PHY layer 2-20 or 2-25 may perform channel coding and modulation of upper layer data to generate OFDM symbols and send the generated OFDM symbols through a wireless channel, or demodulate and channel decode OFDM symbols received through a wireless channel and send the demodulated and channel-decoded OFDM symbols to an upper layer.

[0082] Figure 3 A schematic structural diagram of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0083] Reference Figure 3, the radio access network of the next generation mobile communication system (hereinafter referred to as NR or 5G) may include a next generation base station 3-10 (new radio node B, hereinafter referred to as NR gNB or NR base station) and a new radio core network (NR CN) 3-05. The user terminal 3-15 (hereinafter referred to as new radio user equipment (NR UE) or terminal) can access the external network through the NR gNB 3-10 and the NR CN3-05.

[0084] exist Figure 3 In the next generation mobile communication system, the NR gNB 3-10 may correspond to an evolved Node B (eNB) in a conventional LTE system. The NR gNB may be connected to the NR UE 3-15 through a wireless channel and may provide better services than the conventional Node B. In the next generation mobile communication system, all user traffic is served through a shared channel. Therefore, a device for collecting and scheduling information about the buffer status, available transmission power status, and channel status of the UE is required, and the NR gNB 3-10 may serve as the device. One NR gNB 3-10 may control multiple cells. In the next generation mobile communication system, a bandwidth larger than the current maximum bandwidth may be applied to achieve a higher data transmission speed than the current LTE. In addition, beamforming technology may also be used together with orthogonal frequency division multiplexing (OFDM) as a wireless access technology.

[0085] In addition, according to an embodiment, the NR gNB 3-10 may apply an adaptive modulation and coding (AMC) scheme that determines the modulation scheme and channel coding rate according to the channel state of the NR UE. The NR CN 3-05 may perform functions such as supporting mobility, configuring bearers, configuring QoS, etc. The NR CN 3-05 is a device that performs various control functions for managing the mobility and control functions of the NR UE, and may be connected to multiple base stations. Furthermore, the next generation mobile communication system may interoperate with the conventional LTE system, and the NR CN may be connected to the MME 3-25 through a network interface. The MME 3-25 may be connected to the existing base station eNB 3-30.

[0086] Figure 4 A schematic diagram showing a wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0087] Reference Figure 4 In each of the UE and the base station, the wireless protocol of the next generation mobile communication system may include NR Service Data Adaptation Protocol (SDAP) 4-01 or 4-45, NR Packet Data Convergence Protocol (PDCP) 4-05 or 4-40, NR RLC 4-10 or 4-35, and NR MAC 4-15 or 4-30.

[0088] According to the embodiment, the main functions of NR SDAP 4-01 or 4-45 may include some of the following functions. Of course, it is not limited to the following examples.

[0089] – User data transmission function (transmission of user plane data)

[0090] – Mapping function between QoS flows and data bearers for uplink and downlink (mapping between QoS flows and DRBs in DL and UL)

[0091] – Functionality for marking QoS flow ID in uplink and downlink (marking QoS flow ID in DL and UL packets)

[0092] – Functionality for mapping of reflective QoS flows to data bearers of uplink SDAP PDUs (DRB mapping of reflective QoS flows to ULSDAP PDUs)

[0093] For SDAP layer devices, whether the UE uses the header of the SDAP layer device or the function of the SDAP layer device by PDCP layer device, by bearer or by logical channel can be configured through a radio resource control (RRC) message. If the SDAP header is configured, the SDAP layer device can instruct the UE to update or reconfigure the mapping information between the QoS flow and the data bearer in the uplink and downlink through a 1-bit indicator of the non-access stratum (NAS) reflected quality of service (QoS) and a 1-bit indicator of the access stratum (AS) reflected QoS in the SDAP header. According to an embodiment, the SDAP header may include QoS flow ID information indicating QoS. According to an embodiment, QoS information can be used as data processing priority, scheduling information, etc. to support seamless services.

[0094] According to the embodiment, the main functions of NR PDCP 4-05 or 4-40 may include some of the following functions. Of course, it is not limited to the following examples.

[0095] – Header compression and decompression function (Header compression and decompression: ROHC only)

[0096] – User data transmission function (transmission of user data)

[0097] – Sequential delivery function (sequential delivery of upper layer PDUs)

[0098] – Out-of-order delivery function (out-of-order delivery of upper layer PDUs)

[0099] – Reordering function (for reordering of received PDCP PDUs)

[0100] – Duplicate detection function (duplicate detection of lower layer SDUs)

[0101] – Retransmission function (retransmission of PDCP SDU)

[0102] – Encryption and decryption functions (encryption and decryption)

[0103] – Timer-based SDU removal functionality (timer-based SDU discard in uplink)

[0104] In the above description, the reordering function of the NR PDCP device may refer to a function of reordering the PDCP PDUs received from the lower layer according to the PDCP sequence number (SN). The reordering function of the NR PDCP device may include a function of delivering the reordered data to the upper layer in sequence, a function of directly transmitting the reordered data without considering the sequence, a function of recording the PDCP PDUs lost due to the reordering, a function of reporting the lost PDCP PDU status to the transmitter, and a function of requesting retransmission of the lost PDCP PDU.

[0105] According to the embodiment, the main functions of NR RLC 4-10 or 4-35 may include some of the following functions. Of course, it is not limited to the following examples.

[0106] – Data transmission function (transmission of upper layer PDU)

[0107] – Sequential delivery function (sequential delivery of upper layer PDUs)

[0108] – Out-of-order delivery function (out-of-order delivery of upper layer PDUs)

[0109] – ARQ function (error correction through ARQ)

[0110] – Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU)

[0111] – Resegmentation function (resegmentation of RLC data PDU)

[0112] – Reordering function (reordering of RLC data PDU)

[0113] – Duplicate detection function (Duplicate detection)

[0114] – Error detection function (protocol error detection)

[0115] – RLC SDU deletion function (RLC SDU discard)

[0116] – RLC re-establishment function (RLC re-establishment)

[0117] In the above description, the in-sequence delivery function (in-sequence delivery) of the NR RLC device may refer to a function of transmitting RLC PDUs received from a lower layer to a higher layer in sequence. In the case where one original RLC SDU is split into multiple RLC SDUs and received, the in-sequence delivery function (in-sequence delivery) of the NR RLC device may include a function of reassembling and transmitting the RLC SDUs.

[0118] The sequential delivery function (in-sequence delivery) of the NR RLC device may include a function of reordering the received RLC PDU based on the RLC sequence number (SN) or the PDCP SN, a function of recording the RLC PDU lost due to the reordering, a function of reporting the status of the lost RLC PDU to the transmitting side, and a function of requesting retransmission of the lost RLC PDU.

[0119] The in-sequence delivery function (in-sequence delivery) of the NR RLC device may include the following function: if there is a lost RLC SDU, only the RLC SDU located before the lost RLC SDU is transmitted to the higher layer in sequence.

[0120] The in-sequence delivery function (in-sequence delivery) of the NR RLC device may include the following function: if there is a lost RLC SDU but the specified timer has expired, all RLC SDUs received before the timer is started are transmitted to the higher layer in sequence.

[0121] The in-sequence delivery function (in-sequence delivery) of the NR RLC device may include the following function: if there are lost RLC SDUs but a specified timer has expired, a function is provided to transmit all RLC SDUs received so far to the upper layer in sequence.

[0122] The NR RLC device can process the RLC PDUs sequentially in the order of reception, regardless of the order of their sequence numbers (out-of-order delivery), and transmit them to the PDCP device.

[0123] In the case of receiving segments, the NR RLC device can receive segments stored in the buffer or segments to be received in the future, reconfigure these segments into one RLC PDU, and then transmit them to the NR PDCP device.

[0124] The NR RLC layer may not include the cascading function, and this function may be performed by the NR MAC layer or replaced by the multiplexing function of the NR MAC layer.

[0125] In the above description, the non-sequential delivery function (out-of-order delivery) of the NR RLC device may refer to a function of directly transmitting the RLC SDU received from the lower layer to the higher layer without considering the order of the RLC SDU. The non-sequential delivery function (out-of-order delivery) of the NR RLC device may include a function of reassembling and transmitting these RLC PDUs when one original RLC SDU is segmented into multiple RLC SDUs and then received. The non-sequential delivery function (out-of-order delivery) of the NR RLC device may include a function of storing the RLC SN or PDCP SN of the received RLC PDU, reordering the RLC PDU, and recording the lost RLC PDU.

[0126] According to an embodiment, NR MAC 4-15 or 4-30 may be connected to multiple NR RLC layer devices located in one UE, and the main functions of NR MAC may include some of the following functions. Of course, it is not limited to the following examples.

[0127] – Mapping function (mapping between logical channels and transport channels)

[0128] – Multiplexing and demultiplexing functions (multiplexing / demultiplexing of MAC SDU)

[0129] – Dispatch information reporting function (dispatch information reporting)

[0130] – HARQ functionality (error correction via HARQ)

[0131] – Logical channel priority control function (priority handling between logical channels of a UE)

[0132] – UE priority control function (realizing priority processing between UEs through dynamic scheduling)

[0133] – MBMS service identification function (MBMS service identification)

[0134] – Transmission format selection function (Transmission format selection)

[0135] – Filling function (filling)

[0136] NR PHY 4-20 or 4-25 can perform operations of channel coding and modulating upper layer data to generate OFDM symbols and transmitting the generated OFDM symbols through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting the demodulated and channel-decoded OFDM symbols to an upper layer.

[0137] Figure 5 A block diagram showing the internal structure of a UE according to an embodiment of the present disclosure is shown.

[0138] Reference Figure 5 , the UE may include a radio frequency (RF) processor 5-10, a baseband processor 5-20, a memory 5-30, and a controller 5-40. Of course, not limited to the above example, the UE may include more Figure 5 More or fewer components as shown.

[0139] The RF processor 5-10 can perform functions such as signal band conversion and amplification for sending and receiving signals through a radio channel. That is, the RF processor 5-10 can up-convert the baseband signal from the baseband processor 5-20 to an RF frequency band signal and send the RF frequency band signal via an antenna, and it can down-convert the RF frequency band signal received through the antenna to a baseband signal. For example, the RF processor 5-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. Of course, it is not limited to the above examples. Although Figure 5 Only one antenna is shown in the figure, but the UE may include multiple antennas. In addition, the RF processor 5-10 may include multiple radio frequency links. In addition, the RF processor 5-10 may perform beamforming. In order to implement beamforming, the RF processor 5-10 may adjust the phase and strength of the signal sent or received through multiple antennas or antenna elements, respectively. In addition, the RF processor 5-10 may perform multiple-input multiple-output (MIMO) operations and may receive multiple layers in MIMO operations.

[0140] The baseband processor 5-20 converts between baseband signals and bit streams according to the system physical layer specification. For example, when data is transmitted, the baseband processor 5-20 generates complex symbols by encoding and modulating the transmitted bit stream. When receiving data, the baseband processor 5-20 reconstructs the received bit stream by demodulating and decoding the baseband signal from the RF processor 5-10. For example, in accordance with the orthogonal frequency division multiplexing (OFDM) scheme, when data is transmitted, the baseband processor 5-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then constructs OFDM symbols by performing inverse fast Fourier transform (IFFT) and cyclic prefix (CP) insertion. When receiving data, the baseband processor 5-20 divides the baseband signal provided by the RF processor 5-10 into OFDM symbol units, reconstructs the signals mapped to the subcarriers by performing fast Fourier transform (FFT), and then reconstructs the received bit stream by demodulating and decoding these signals.

[0141] The baseband processor 5-20 and the RF processor 5-10 are used to send and receive signals as described above. The baseband processor 5-20 and the RF processor 5-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. In addition, at least one of the baseband processor 5-20 or the RF processor 5-10 may include multiple communication modules to support a variety of different wireless access technologies. In addition, at least one of the baseband processor 5-20 or the RF processor 5-10 may include different communication modules to process signals of different frequency bands. For example, different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include super high frequency (SHF) (e.g., 2.NRHz, NRHz) bands and millimeter wave (mmWave) (e.g., 60 GHz) bands. The UE may use the baseband processor 5-20 and the RF processor 5-10 to send and receive signals with the base station, and these signals may include control information and data.

[0142] The memory 5-30 stores default programs, applications and data, for example, configuration information for UE operation. In particular, the memory 5-30 can store information related to access nodes that perform wireless communication using the second radio access technology. In addition, the memory 5-30 provides the stored data according to the request of the controller 5-40. The memory 5-30 can be composed of a storage medium such as ROM, RAM, hard disk, CD-ROM and DVD, or a combination of storage media. And, the memory 5-30 can be composed of multiple memories.

[0143] The controller 5-40 controls the overall operation of the UE. For example, the controller 5-40 sends and receives signals through the baseband processor 5-20 and the RF processor 5-10. In addition, the controller 5-40 also performs operations of recording and reading data on the memory 5-30. To this end, the controller 5-40 may include at least one processor. For example, the controller 5-40 may include a communication processor (CP) for controlling communication and an application processor (AP) for controlling an upper layer such as an application. In addition, at least one component within the UE may be implemented as a chip.

[0144] Figure 6 A block diagram showing the configuration of a base station according to an embodiment of the present disclosure.

[0145] Reference Figure 6 The base station may include an RF processor 6-10, a baseband processor 6-20, a backhaul communicator 6-30, a memory 6-40, and a controller 6-50. Of course, the base station is not limited to the above example. Figure 6 More or fewer components as shown.

[0146] The RF processor 6-10 can perform functions such as frequency band conversion and amplification of signals for sending and receiving signals through wireless channels. That is, the RF processor 6-10 up-converts the baseband signal provided by the baseband processor 6-20 into an RF segment signal and transmits the RF segment signal via the antenna, and it down-converts the RF segment signal received via the antenna into a baseband signal. For example, the RF processor 6-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although Figure 6 Only one antenna is shown in the figure, and the RF processor 6-10 may also include multiple antennas. In addition, the RF processor 6-10 may include multiple RF chains. In addition, the RF processor 6-10 may perform beamforming. In order to perform beamforming, the RF processor 6-10 may adjust the phase and strength of the signal sent or received via multiple antennas or antenna elements respectively. The RF processor may perform downlink MIMO operation by sending one or more layers.

[0147] The baseband processor 6-20 converts between the baseband signal and the bit stream according to the physical layer specification of the first wireless access technology. For example, when data is transmitted, the baseband processor 6-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when data is received, the baseband processor 6-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 6-10. For example, in accordance with the OFDM scheme, when data is transmitted, the baseband processor 6-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then constructs OFDM symbols by performing IFFT and CP insertion. When data is received, the baseband processor 6-20 divides the baseband signal provided by the RF processor 6-10 into OFDM symbol units, reconstructs the signal mapped to the subcarrier by performing FFT, and then reconstructs the received bit stream by demodulating and decoding the signal. The baseband processor 6-20 and the RF processor 6-10 send and receive signals as described above. The baseband processor 6-20 and the RF processor 6-10 may be referred to as a transmitter, a receiver, a transceiver, a communicator, or a wireless communicator. The base station may use the baseband processor 6-20 and the RF processor 6-10 to send and receive signals with the UE, which may include control information and data.

[0148] The backhaul communicator 6-30 provides an interface for communicating with other nodes in the network. That is, the backhaul communicator 6-30 converts the bit stream sent by the main base station to any other node such as the auxiliary base station, the core network, etc. into a physical signal, and converts the physical signal received from these other nodes into a bit stream.

[0149] The memory 6-40 stores default programs, applications and data, for example, configuration information for base station operation. In particular, for example, the memory 6-40 may store information related to the bearer allocated to the connected UE, measurement results reported by the connected UE, etc. In addition, the memory 6-40 may store standard information for determining whether to provide or release dual connectivity to the UE. In addition, the memory 6-40 provides the stored data upon request by the controller 6-50. The memory 6-40 may be composed of a storage medium such as ROM, RAM, hard disk, CD-ROM and DVD, or a combination of storage media. In addition, the memory 6-40 may be composed of a plurality of memories. According to some embodiments, the memory 6-40 may store a program for executing the buffer status reporting method according to the present disclosure.

[0150] The controller 6-50 may control the overall operation of the base station. For example, the controller 6-50 sends and receives signals through the baseband processor 6-20 and the RF processor 6-10, or through the backhaul communicator 6-30. In addition, the controller 6-50 records and reads data on the memory 6-40. To this end, the controller 6-50 may include at least one processor. In addition, at least one component of the base station may be implemented as a chip.

[0151] In this disclosure, a Network Controlled Repeater (NCR) is referred to as a single entity, and in terms of operation, one NCR is clearly divided into NCR-MT (Mobile Terminating) and NCR-FWD (Forwarding).

[0152] Figure 7 A schematic diagram of the configuration of a network controlled repeater according to an embodiment of the present disclosure is shown.

[0153] The Network Controlled Repeater (NCR) consists of NCR-MT and NCR-FWD. MT is the abbreviation of Mobile Termination, and NCR-MT can receive control signals for NCR operations from the serving gNB and send control information to NCR-FWD. FWD is the abbreviation of Forwarding, and NCR-FWD amplifies the RF signal received from the gNB and transmits it to the UE. NCR-FWD can perform additional operations through the control information received from the NCR-MT. For example, NCR-FWD can send an amplified signal to the UE or receive a signal sent by the UE using a specific beam. In addition, for example, NCR-FWD can receive / amplify / transmit the signal from the gNB according to a specific time division duplex (TDD) mode, or perform or not perform reception / amplification / transmission on the signal from the UE.

[0154] In order to perform the above operations, the NCR and the network should be able to distinguish each other. The following describes a method for distinguishing between the NCR and the network (i.e., serving gNB) and a method for exchanging NCR-specific configuration information accordingly.

[0155] The cell may include a separate cell for controlling the NCR. The NCR may perform operations required to access the separate cell and receive control information from the separate cell for this purpose. The separate cell needs to provide an indicator to indicate that it is a cell for NCR purposes, and the NCR may continue to attempt to access the separate cell after having identified the cell for NCR purposes. For example, the serving gNB is capable of supporting normal UEs and may be a gNB that supports both normal UEs and NCRs, or a gNB that cannot support both normal UEs and NCRs. According to the example, the following cases can be divided: A gNB supporting NCR or NCR functionality may include an indicator of NCR support in a master information block (MIB) or system information block (SIB) and broadcast it.

[0156] In another example, the gNB may introduce an intraFreqReselection-NCR bit (IFR bit) in the SIB. This bit may have a value of allowed or not allowed. The presence of this bit may mean that the cell supports NCR. After cell selection / reselection, if this bit is included in the SIB, the NCR-MT may attempt to access the cell by performing random access. If this bit is not present in the SIB for the cell during cell selection / reselection, the NCR-MT may treat the cell as prohibited, treat the intraFreqReselection-NCR bit as configured as allowed, and select another cell with the same frequency as the prohibited cell when selecting / reselecting another cell.

[0157] In a more specific example, if this bit is present in the SIB and its value is not allowed, the NCR-MT can attempt to access the cell, and if the cell is prohibited from access during the access attempt, it must consider selecting / reselecting cells with other frequencies except the frequency of the prohibited cell. In other words, the corresponding frequency is also considered prohibited from access.

[0158] On the other hand, if this bit is present in the SIB and its value is allowed, the NCR-MT may attempt to access the cell, and if the cell is barred during the access attempt, cells with the same frequency as the barred cell may be considered when selecting / reselecting cells.

[0159] The NCR-MT can selectively attempt to access a cell supporting NCR during the cell selection / reselection process in the above manner. If there is a process of establishing an RRC connection afterwards, the NCR-MT should notify the cell that it is an NCR entity or NCR-MT. The method is as follows: Case 1: Notification method during random access channel (RACH) preamble transmission The NCR-MT can be pre-configured with a dedicated random access preamble and / or RACH opportunity (RO) and / or RACH resources. Alternatively, the NCR-MT can receive RACH-related configurations from the MIB or SIB of the cell it is trying to access. After cell selection / reselection, the NCR-MT can attempt random access to access the cell. During this process, if RACH is attempted using an NCR-dedicated RACH preamble / RO / resource, the base station (gNB) can identify that the UE attempting access is an NCR, and then the gNB can send control information for NCR-FWD through the NCR-MT.

[0160] Case 2: Notification method during the remaining RACH process

[0161] In the RACH process, the message (MSG) 3 in the four-step RACH or the MSG A in the two-step RACH may include an NCR-specific logical channel ID (LCID). This LCID is used to distinguish the common control channel (CCCH) contained in the corresponding MSG 3 or MSG A MAC PDU, and this LCID may be included in the MAC subheader in the MAC PDU. In this case, the UL CCCH may be, for example, RRCSetupRequest. According to this method, the gNB that successfully receives the MSG 3 or MSG A recognizes that the corresponding UE is an NCR based on this. Thereafter, the gNB may send control information for NCR-FWD through the NCR-MT.

[0162] Case 3: Notification method during RRC connection establishment after RACH success

[0163] Case 3-1: Notification method using RRCSetupComplete message

[0164] In the case of successfully completing the RACH process after cell selection / reselection and receiving the uplink (UL) grant, the NCR-MT sends MSG 3 to the serving gNB through the RRCSetupRequest message, and if the serving gNB sends an RRCSetup message, the NCR-MT applies this configuration and sends an RRCSetupComplete message to the serving gNB. At this time, the RRCSetupComplete message may contain an indicator indicating the NCR. The following detailed process may correspond to Figure 8a and Figure 8b In this example, the NCR support bit is included in the MIB / SIB, but the method of using the same-frequency reselection bit can also be used.

[0165] Figure 8a and Figure 8bThe flowchart shows a method in which the NCR-MT notifies that it is an NCR entity by using the RRCSetupComplete message.

[0166] Reference Figure 8a , in S801, NCR-MT 810 can switch from an idle state to a connected state or power on.

[0167] In step S802, NCR-MT 810 receives a signal from a surrounding cell (e.g., Figure 8a After the synchronization signal block (SSB) sent by base station 1 (gNB1, 830) and base station 2 (gNB2, 820) is measured, the signal strength of each cell is obtained, and a cell that meets the cell selection condition is selected based on this measurement result. Here, it is assumed that the cell selected by NCT-MT 810 is the cell of gNB2 820.

[0168] Then, in S803, if the MIB or SIB1 of the selected cell is received and it is identified that the cell is not a cell supporting NCR, the NCR-MT 810 assumes a cell prohibited state, in S804, performs cell selection on another cell (e.g., the cell of gNB1 830), and in S805, receives the MIB / SIB1 of the cell to determine whether it is a cell supporting NCR.

[0169] After identifying that the cell is a cell supporting NCR, NCR-MT 810 may perform a random access procedure to the cell in S806. For example, in this process, NCR-MT 810 may send MSG 3 to cell 830 in S806a through an RRCSetupRequest message, and receive an RRCsetup message as a response from cell 830 in S806b. At this time, the RRCSetupRequest message may include information about a connection establishment cause (EstablishmentCause) specific to NCR.

[0170] like Figure 8b As shown, in S807, the NCR-MT 810 that has received the RRCSetup message can apply the master cell group (MCG) configuration for MAC and PHY obtained from the corresponding cell 830 based on this. In addition, in S808, the NCR-MT 810 can send an RRCSetupComplete message to the corresponding cell to complete the RRC connection establishment. Here, the RRCSetupComplete message may include at least one of the following: an indicator indicating that the NCR-MT 810 is an NCR, an NCR-MT ID, or a NAS registration request.

[0171] Meanwhile, the procedures described above and the procedures to be described below may apply the following specific operations / contents.

[0172] 1) A gNB supporting NCR broadcasts an indication of support for NCR in the MIB or SIB. 2) When a UE acting as an NCR-MT is powered on (or the UE is in idle / inactive state), it may first search for a frequency to camp on and select a cell based on the measurement results (i.e., perform a conventional cell (re)selection procedure).

[0173] 3) If the selected cell provides or broadcasts the NCR support bit in the MIB or SIB, the UE (NCR-MT) finally selects the cell to establish the RRC connection.

[0174] A>NCR-MT applies the configuration in the MIB and SIB1 of the selected cell.

[0175] B>When NCR-MT attempts to establish an RRC connection, NCR-MT performs a random access procedure with gNB. NCR-MT sends an RRCSetupRequest message to gNB, and gNB responds to NCR-MT with an RRCSetup message. In the RRCSetupRequest message, a new establishment cause value indicating NCR control traffic is included. After NCR-MT configures the received RRCSetup message, the UE can add the NCR-MT indication in the RRCSetupComplete message and send this message when the RRC establishment process is successful.

[0176] i. Regardless of whether the above NCR-MT indication is included, the RRCSetupComplete message may also include: NCR-specific entity ID (and / or (MT) ID, and / or FWD ID), which is either in the traditional NAS message 'Registration Request' or outside it, and transmit this information.

[0177] C> The serving gNB identifies that the accessed UE is an NCR-MT, and certain UE IDs visible in the CN may be transmitted to the CN for authorization (such as 5G TMSI or 5G-GUTI, or NCR-FWD ID).

[0178] i.NCR-FWD ID is transmitted to CN in IE 'NCR', then CN can identify NCR-FWD.

[0179] 4) Otherwise, the UE (NCR-MT) regards the cell as prohibited from access.

[0180] A> For the frequency of this prohibited cell: i. This frequency is also prohibited and ii. (Assuming that NCR-MT does not ignore other cell reserved bits in MIB including IFRI bit) If the IFRI bit in MIB is set to not allowed, the frequency is prohibited. Otherwise, the frequency is not prohibited.

[0181] iii. The frequency is not prohibited

[0182] See again Figure 8b , after the serving gNB 830 establishes an RRC connection with the NCR-MT 810 in S808, it may transmit a registration request to the AMF 840 by using an NGAP Initialization UE message. At this time, the NGAP Initialization UE message may include an establishment cause indicating that it is an RRC connection indicator for NCR control obtained during the RRC connection process. In addition, the ID of the NCR-MT or NCR entity, or the NCR-Fwd ID may be included in this message. This information may be sent by the serving gNB 830 to the AMF 840 in S809, and this information may be used by the core network 850 to authorize and authenticate the NCR entity in S810 and S811.

[0183] Specifically, the AMF 840 may, after receiving an indicator (e.g., UE ID of the NCR MT) for identifying the UE as an NCR node sent through an initialization UE message from the serving gNB 830, send the indicator to a separate server storing the ID on the core network 850 or to a server 850 co-located with the AMF 840 to confirm whether the UE is authorized as an NCR node. If it is confirmed that the UE is authorized as an NCR node, the separate server on the core network 850 or the server 850 co-located with the AMF 840 may send an indication to the AMF 840 that the UE has been authorized. Upon receiving the indication, the AMF 840 may provide the serving gNB 830 with an indication that the UE has been authorized through an initial UE context establishment request message. The NCR authorization confirmation operation performed by the AMF and the co-located server described above may be replaced by the implementation of the AMF.

[0184] After receiving the information related to the authorization and authentication of the NCR entity, the serving gNB 830 may send control information for NCR-Fwd operation to the NCR-MT 810. The configuration information of the L1 / L2 channel used to send the control information may be sent to the NCR-MT 810 via a DL RRC message or an RRCReconfiguration message in S812. The detailed configuration sent at this time may be as follows: NCR specific configuration, namely, PDCCH / PDSCH configuration for side control information channel, PUCCH / PUSCH configuration for side control information channel, DCI / UCI configuration for reception and transmission of side control information, and configuration of MAC CE.

[0185] In S813, the NCR-MT 810 may apply the above configuration to receive side control information for NCR-Fwd from the serving gNB 830 via L1 / L2 control signals.

[0186] Case 3-2: Notification method using RRCSetupRequest message

[0187] In the case where the RACH process is successfully completed after cell selection / reselection and UL authorization is received, the NCR-MT sends MSG 3 to the serving gNB through the RRCSetupRequest message, and if the serving gNB sends an RRCSetup message, the NCR-MT applies this configuration and sends an RRCSetupComplete message to the serving gNB. At this time, the RRCSetupRequest message may contain an indicator indicating the NCR. The following detailed process may correspond to Figure 9a and Figure 9b In this example, the case where the NCR support bit is included in the MIB / SIB is described, but the method of using the same frequency reselection bit can also be adopted.

[0188] Figure 9a and Figure 9b The flowchart shows a method in which the NCR-MT notifies that it is an NCR entity by using an RRCSetupRequest message.

[0189] Reference Figure 9a , in S901, NCR-MT 910 can switch from idle state to connected state or power on.

[0190] In step S902, upon receiving a signal from a surrounding cell (e.g. Figure 9a After receiving the SSBs sent by gNB1 (gNB1, 930) and gNB2 (gNB2, 920) as shown, NCR-MT 910 determines the signal strength of each cell and selects a cell that meets the cell selection criteria based on this measurement result. Here, it is assumed that the cell selected by NCT-MT 910 is the cell of gNB2 920.

[0191] Then, in S903, if the MIB or SIB1 of the selected cell is received and it is identified that the cell is not a cell supporting NCR, the NCR-MT 910 assumes a cell barring state, performs cell selection on another cell (e.g., a cell of gNB1 930) in S904, and receives the MIB / SIB1 of the cell in S905 to identify whether it is a cell supporting NCR. For example, the MIB / SIB1 may include an NCR support indicator indicating that the cell supports NCR.

[0192] After identifying that the cell is a cell supporting NCR, the NCR-MT 910 may perform a random access procedure on the cell in S906. For example, in this process, the NCR-MT 910 may send MSG 3 to the cell 930 in S906a through an RRCSetupRequest message, and at this time, the RRCSetupRequest message may include an NCR-MT indicator indicating the NCR-MT, a connection establishment cause (EstablishmentCause) specific to the NCR, and / or an ID related to the NCR.

[0193] Meanwhile, the procedures described above and the procedures to be described below may apply the following specific operations / contents.

[0194] 1) A gNB supporting NCR broadcasts an indication of support for NCR in the MIB or SIB.

[0195] 2) When a UE acting as an NCR-MT is powered on (or the UE is in an idle / inactive state), it may first search for a frequency for camping and select a cell based on the measurement results (i.e., perform a conventional cell (re)selection procedure).

[0196] 3) If the selected cell provides or broadcasts the NCR support bit in the MIB or SIB, the UE (NCR-MT) finally selects the cell to establish the RRC connection.

[0197] A> NCR-MT applies the configuration in the MIB and SIB1 of the selected cell

[0198] B> When NCR-MT attempts to establish an RRC connection, the UE can add a 1-bit indication in the RRCSetupRequest message to indicate the NCR-MT or NCR entity, and send this message when UL grant is obtained.

[0199] i. Regardless of whether the above-mentioned NCR-MT indication is included, in the RRCSetupRequest message, the traditional "InitialUE-Identity" field may indicate the NCR-specific UE ID, or the NCR-specific UE ID may be further indicated in a separate IE instead of in the "initialUE-Identity" field.

[0200] ii. Independent of the above indication, in the RRCSetupRequest message, the "Establishment Cause" may further indicate the "NCR MT Access" value

[0201] C> After receiving the above RRCSetupRequest message, the serving gNB identifies the connected UE as an NCR-MT, selects radio resources and schedules resources (frequency / time domain resource allocation, MCS selection, etc.) for the NCR MT accordingly through PDCCH.

[0202] D> The serving gNB sets up SRB1 and sends an RRCSetup message to the NCR-MT.

[0203] The UE (NCR-MT) applies the received RRCSetup configuration and generates an RRCSetupComplete message, which may include: the NCR-specific entity ID (and / or UE ID, and / or FWD ID), which may or may not be included in the traditional NAS message "Registration Request", and sends this message.

[0204] 4) Otherwise, the UE (NCR-MT) regards the cell as prohibited from access.

[0205] For the frequency of the prohibited cell: i. and prohibition of the frequency and ii. (Assuming that NCR-MT does not ignore other cell reserved bits in MIB including IFRI bit) If the IFRI bit in MIB is set to not allowed, the frequency is prohibited. Otherwise, the frequency is not prohibited.

[0206] iii. The frequency is not prohibited

[0207] Reference Figure 9bIn S907, the serving gNB 930 may confirm that the accessed UE is an NCR-MT based on the information received from the NCR-MT 910, and provide an NCR-specific primary cell group configuration (e.g., mac-CellGroupConfig, PhysicalCellGroupConfig). The configuration may be sent to the NCR-MT 910 in S907a via an RRCSetup message. The NCR-MT 910 that receives the NCR-specific cell group configuration for the MAC layer or the PHY layer provided by the serving gNB 930 may apply the corresponding cell group configuration in S908.

[0208] In addition, in S909, the NCR-MT 910 may send a NAS message including a registration request to the serving gNB 930 via an RRCSetupComplete message. After establishing an RRC connection with the NCR-MT 910, in S910, the serving gNB 930 may send a registration request to the AMF 940 by using an NGAP Initial UE message. At this time, the NGAP Initial UE message may include an establishment cause indicating that it is an RRC connection indicator for NCR control obtained during the RRC connection process. In addition, the ID of the NCR-MT or NCR entity, or the NCR-Fwd ID may also be included in this message. This information may be sent from the serving gNB 930 to the AMF 940 and used by the core network 950 to authorize and authenticate the NCR entity in S911 and S912. Here, the authentication procedure between the AMF 940 and the core network 950 is the same as that described above. Figure 8a and Figure 8b Same as described in .

[0209] After receiving information related to the authorization and authentication of the NCR entity, the serving gNB 930 may send control information for NCR-Fwd operation to the NCR-MT 910. In S913, the configuration information of the L1 / L2 channel used to send the control information may be sent to the NCR-MT 910 via a DL RRC message or an RRCReconfiguration message. The detailed configuration sent at this time may be as follows.

[0210] NCR specific configuration, namely, PDCCH / PDSCH configuration for side control information channel, PUCCH / PUSCH configuration for side control information channel, DCI / UCI configuration and MAC CE configuration for side control information reception and transmission.

[0211] In S914, the NCR-MT 910 may apply the above configuration to receive side control information for NCR-Fwd from the serving gNB 930 via L1 / L2 control signals.

[0212] At the same time, the embodiments and drawings of the present disclosure are only examples provided for the convenience of describing the present disclosure and facilitating the understanding of the present disclosure, but are not intended to limit the scope of the present disclosure. That is to say, it is obvious to those skilled in the art that other modifications can be implemented according to the technical ideas of the present disclosure. In addition, the above-mentioned embodiments can be used in combination with each other as needed. For example, one embodiment and another embodiment of the present disclosure can be partially combined with each other to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other modifications made according to the technical ideas of the embodiments can also be implemented. For example, the embodiments can be applied to LTE systems, 5G, NR systems, 6G systems, etc. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving system information from a base station; identifying whether the system information includes an indicator indicating support for a network controlled repeater NCR; as well as Based on the indicator included in the system information, sending a random access preamble code for a random access procedure to the base station, Wherein, the terminal supports the NCR function.

2. The method according to claim 1, further comprising: receiving a random access response to the random access preamble from the base station; Sending a radio resource control RRC establishment request message to the base station based on the uplink grant included in the random access response; receiving, from the base station, an RRC setup message in response to the RRC setup request message; as well as Based on the RRC establishment message, sending an RRC establishment completion message to the base station, The RRC establishment completion message includes indication information indicating that the terminal supports the NCR function.

3. The method according to claim 2, wherein: The RRC setup complete message also includes a registration request for the access and mobility management function AMF, and The NCR authentication for the terminal is performed by the AMF based on the indication information.

4. A method performed by a base station in a wireless communication system, the method comprising: generating an indicator indicating support for a network controlled repeater NCR; broadcasting system information including the indicator; as well as A random access preamble based on the system information is received from a terminal.

5. The method according to claim 4, further comprising: sending a random access response to the random access preamble to the terminal; receiving a radio resource control (RRC) establishment request message from the terminal, wherein the RRC establishment request message includes an uplink grant based on the random access response; Sending an RRC establishment message in response to the RRC establishment request message to the terminal; as well as receiving, from the terminal, an RRC setup complete message based on the RRC setup message, The RRC establishment completion message includes indication information indicating that the terminal supports the NCR function.

6. The method according to claim 5, further comprising: Sending an initial user equipment UE message to an access and mobility management function AMF based on the RRC setup complete message; as well as receiving, from the AMF, a message based on the initial UE message and including NCR authentication information for the terminal, The RRC establishment completion message also includes a registration request of the terminal. The initial UE message includes the indication information, and The NCR authentication information is determined based on the indication information.

7. The method according to claim 6, further comprising: Based on the NCR authentication information, a message including control information for terminal operation is sent to the terminal.

8. A terminal in a wireless communication system, the terminal comprising: Transceiver; as well as The controller is configured as: controlling the transceiver to receive system information from a base station, identifying whether the system information includes an indicator indicating support for a network controlled repeater NCR, and Based on the indicator included in the system information, controlling the transceiver to send a random access preamble code for a random access procedure to the base station, Wherein, the terminal supports the NCR function.

9. The terminal according to claim 8, in, The controller is also configured to: controlling the transceiver to receive a random access response to the random access preamble from the base station; Based on the random access response including an uplink grant, controlling the transceiver to send a radio resource control RRC establishment request message to the base station; controlling the transceiver to receive an RRC establishment message in response to the RRC establishment request message from the base station; as well as Based on the RRC setup message, controlling the transceiver to send an RRC setup complete message to the base station, and The RRC establishment completion message includes indication information indicating that the terminal supports the NCR function.

10. The terminal according to claim 9, in, The RRC setup complete message also includes a registration request for the access and mobility management function AMF, and Among them, the NCR authentication of the terminal is performed by the AMF based on the indication information.

11. A base station in a wireless communication system, the base station comprising: Transceiver; as well as The controller is configured as: generating an indicator indicating support for a network controlled repeater NCR, controlling the transceiver to broadcast system information including the indicator, and The transceiver is controlled to receive a random access preamble based on the system information from a terminal.

12. The base station according to claim 11, in, The controller is also configured to: Controlling the transceiver to send a random access response to the random access preamble to the terminal; controlling the transceiver to receive a radio resource control RRC establishment request message from the terminal, wherein the RRC establishment request message includes an uplink grant based on the random access response, controlling the transceiver to send an RRC establishment message in response to the RRC establishment request message to the terminal, and controlling the transceiver to receive an RRC setup complete message based on the RRC setup message from the terminal, and The RRC establishment completion message includes indication information indicating that the terminal supports the NCR function.

13. The base station according to claim 12, in, The controller is further configured to: control the transceiver to send an initial user equipment UE message to an access and mobility management function AMF based on the RRC setup complete message; and control the transceiver to receive a message including NCR authentication information for the terminal based on the initial UE message from the AMF, and The RRC establishment completion message also includes a registration request of the terminal. The initial UE message includes the indication information, and The NCR authentication information is determined based on the indication information.

14. The base station according to claim 13, wherein: The controller is further configured to: based on the NCR authentication information, control the transceiver to send a message including control information for terminal operation to the terminal.

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