Method and apparatus for blocking unmanned aerial vehicle connection in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to various embodiments disclosed herein, a method performed by an unmanned aerial vehicle (UAV) terminal in a radio resource control (RRC) IDLE or RRCINACTIVE state may be provided. The method may comprise the steps of: receiving, from a base station, a message including system information including first information indicating whether the UAV terminal can be connected; and performing camping on the base station based on the first information in response to a message including the received system information.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for preventing an unmanned aerial vehicle from connecting in a wireless communication system. Background Art

[0002] 5G mobile communication technology defines a wide frequency band that enables high transmission rates and new services, and can be implemented not only in "below 6 GHz" frequency bands such as 3.5 GHz, but also in ultra-high frequency ("above 6 GHz") frequency bands called millimeter waves such as 28 GHz and 39 GHz. In addition, it has been considered to implement 6G mobile communication technology (called a super 5G system) in a terahertz frequency band (e.g., 95 GHz to 3 THz frequency band) in order to achieve a transmission rate 50 times faster than that of 5G mobile communication technology and an ultra-low latency of one tenth of that of 5G mobile communication technology.

[0003] In the initial stage of 5G mobile communication technology, in order to support services and meet performance requirements for enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC) and massive machine type communication (mMTC), standardization has been carried out on the following technologies: beamforming and massive MIMO for reducing radio wave path loss and increasing radio wave transmission distance in millimeter waves; parameter sets for dynamic operation of efficient utilization of millimeter wave resources and time slot formats (for example, operating multiple subcarrier intervals); initial access technology for supporting multi-beam transmission and wide frequency band; definition and operation of bandwidth part (BWP); new channel coding methods such as low-density parity check (LDPC) codes for large-capacity data transmission and polar codes for high-reliability transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks customized for specific services.

[0004] Currently, with respect to services supported by 5G mobile communication technology, discussions are underway on improvements and performance enhancements of initial 5G mobile communication technology, and physical layer standardization has been conducted on technologies such as: vehicle-to-everything (V2X) for assisting driving determination of autonomous vehicles based on information about the location and status of vehicles sent by vehicles and for improving user convenience; new radio unlicensed (NR-U), NR UE energy saving designed to enable system operations to comply with various regulatory-related requirements in unlicensed frequency bands; non-terrestrial network (NTN) for UE satellite direct communication to ensure coverage in areas where communication with terrestrial networks is not possible; and positioning.

[0005] In addition, standardization has been conducted in the field of wireless interface architecture / protocols for technologies such as: Industrial Internet of Things (IIOT) for supporting new services by interoperating and integrating with other industries; Integrated access and backhaul (IAB) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner; Mobility enhancement including conditional switching and dual active protocol stack (DAPS) switching; and two-step random access (two-step RACH for NR) for simplifying the random access process. Standardization has also been conducted in the field of system architecture / services for technologies such as: 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined network (SDN) technologies; and mobile edge computing (MEC) for receiving services based on UE location.

[0006] If such a 5G mobile communication system is commercialized, the already exponentially growing number of connected devices will be connected to the communication network, and it is therefore expected that enhanced functionality and performance of the 5G mobile communication system and integrated operation of connected devices will be necessary. To this end, new research on the following technologies is on the agenda: extended reality (XR) for efficient support of augmented reality (AR), virtual reality (VR), mixed reality (MR), etc.; 5G performance improvement and complexity reduction by utilizing artificial intelligence (AI) and machine learning (ML); AI service support; metaverse service support; and drone communication.

[0007] Furthermore, such developments in 5G mobile communication systems will serve not only as a basis for developing technologies such as: new waveforms for securing coverage in the terahertz band for 6G mobile communication technology; full-dimensional MIMO (FD-MIMO); multi-antenna transmission technologies such as array antennas and massive antennas; metamaterial-based lenses and antennas for improving coverage of terahertz band signals; high-dimensional spatial multiplexing technology using orbital angular momentum (OAM); and reconfigurable smart surfaces (RIS), but will also serve as a basis for developing technologies such as: full-duplex technology for improving frequency efficiency of 6G mobile communication technology and improving system networks; AI-based communication technology for achieving system optimization using satellites and AI from the design stage and internalizing end-to-end AI support functions; and next-generation distributed computing technology for achieving services at a complexity level that exceeds the limits of UE operating capabilities by utilizing ultra-high-performance communication and computing resources.

[0008] With the development of the mobile communication system described above, different services may be provided, and thus a way of efficiently providing these services is required, particularly a way of providing a method for efficiently integrating access and backhaul node control. Summary of the invention

[0009] The disclosed embodiments provide an apparatus and method capable of efficiently providing services in a wireless communication system.

[0010] According to various embodiments of the present disclosure, a method performed by an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state may be provided. The method may include: receiving a message including system information from a base station, wherein the system information includes first information indicating whether the UAV UE can be connected, and in response to the received message including the system information, performing pre-occupation on the base station based on the first information.

[0011] According to different embodiments of the present disclosure, a method performed by a base station may be provided. The method may include: sending a message including system information to an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state, wherein the system information includes first information indicating whether the UAV UE can be connected, and in response to the sent message including the system information, performing communication with the UAV UE in the RRC_IDLE or RRC_INACTIVE state based on the first information.

[0012] According to different embodiments of the present disclosure, an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state may be provided. The UAV UE in the RRC_IDLE or RRC_INACTIVE state may include a transceiver and a controller connected to the transceiver, wherein the controller is configured to receive a message including system information from a base station, the system information including first information indicating whether the UAV UE can be connected, and based on the first information, perform pre-occupation on the base station in response to the received message including the system information.

[0013] According to different embodiments of the present disclosure, a base station may include a transceiver and a controller connected to the transceiver, wherein the controller is configured to send a message including system information to an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state, the system information including first information indicating whether the UAV UE can be connected, and in response to the sent message including the system information, perform communication with the UAV UE in the RRC_IDLE or RRC_INACTIVE state based on the first information.

[0014] According to an embodiment of the present disclosure, a method performed by an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state is provided.

[0015] The method includes receiving a message including system information, wherein the system information includes first information indicating whether the UAV UE can be connected, second information indicating whether the UAV UE can reselect a neighboring cell using the same frequency, and third information indicating a height threshold.

[0016] The method includes: in a case where a height of the UAV UE is equal to or greater than a height threshold, performing pre-camping on a cell based on first information indicating whether the UAV UE can be connected.

[0017] The method includes reselecting a neighboring cell using the same frequency as the cell based on second information indicating whether the UAV UE can reselect a neighboring cell using the same frequency when the altitude of the UAV UE is equal to or greater than an altitude threshold.

[0018] The disclosed embodiments provide an apparatus and method capable of efficiently providing services in a mobile communication system.

[0019] Advantageous effects that can be obtained from the present disclosure may not be limited to the above-mentioned effects, and other effects that are not mentioned may be clearly understood by those skilled in the art to which the present disclosure pertains from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1a The structure of an LTE system in a wireless communication system according to an embodiment of the present disclosure is shown.

[0021] Figure 1b A wireless protocol structure of an LTE system in a wireless communication system according to an embodiment of the present disclosure is shown.

[0022] Figure 1c A structure of a next-generation mobile communication system in a wireless communication system according to an embodiment of the present disclosure is shown.

[0023] Figure 1d is a diagram showing a wireless protocol structure of a next-generation mobile communication system in a wireless communication system according to an embodiment of the present disclosure.

[0024] Figure 1e A method for an unmanned aerial vehicle (UAV) UE to access a cell in a wireless communication system according to an embodiment of the present disclosure is shown.

[0025] Figure 1f A method for an unmanned aerial vehicle (UAV) UE to access a cell in a wireless communication system according to an embodiment of the present disclosure is shown.

[0026] Figure 1gA method for an unmanned aerial vehicle (UAV) UE to access a cell in a wireless communication system according to an embodiment of the present disclosure is shown.

[0027] Figure 1h A process of performing UE access control in a wireless communication system according to an embodiment of the present disclosure is shown.

[0028] Figure 1i is a flowchart of a process of performing conventional UE access control in a wireless communication system according to an embodiment.

[0029] Figure 1j is a flowchart of a process of performing access control in a wireless communication system according to an embodiment of the present disclosure.

[0030] Figure 1k is a flowchart of a process of performing access control in a wireless communication system according to an embodiment of the present disclosure.

[0031] Figure 1l It is shown that a new physical random access channel (PRACH) parameter priority is configured for a UAVUE by a new radio (NR) base station in a wireless communication system according to an embodiment of the present disclosure.

[0032] Figure 1m is a block diagram showing an internal structure of a UE in a wireless communication system according to an embodiment of the present disclosure.

[0033] Figure 1n is a block diagram showing the configuration of an NR base station in a wireless communication system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Hereinafter, the operating principle of the present disclosure will be described in detail in conjunction with the accompanying drawings. In the following description of the present disclosure, a detailed description of the known functions or configurations introduced into the present disclosure will be omitted when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear. The terms to be described below are defined in consideration of the functions in the present disclosure, and may differ depending on the user, the user's intention or custom. Therefore, the definition of the terms should be based on the content of the entire specification.

[0035] In the following description of the present disclosure, a detailed description of well-known functions or configurations introduced into the present disclosure will be omitted when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0036] In the following description, for the purpose of convenience of description, terms used to identify access nodes, terms related to network entities, terms related to messages, terms related to interfaces between network entities, terms related to different identification information, and similar terms are illustratively used. Therefore, the present disclosure is not limited to the terms described below, and other terms related to subjects with equivalent technical meanings may also be used.

[0037] In the following description of the present disclosure, for the purpose of convenience of description, terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard will be used. 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. In the present disclosure, for the convenience of description, the term "eNB" may be used interchangeably with the term "gNB". That is, a base station described as an "eNB" may refer to a "gNB".

[0038] Figure 1a The structure of an LTE system in a wireless communication system according to an embodiment of the present disclosure is shown.

[0039] Reference Figure 1a As shown therein, the wireless access network of the LTE system includes next-generation base stations (evolved Node B, hereinafter referred to as eNB, Node B or base station) 1a-05, 1a-10, 1a-15 and 1a-20, a mobility management entity (MME) 1a-25 and a serving gateway (S-GW) 1a-30. User equipment (hereinafter referred to as UE or terminal) 1a-35 accesses an external network through eNB 1a-05 to 1a-20 and S-GW 1a-30.

[0040] exist Figure 1aIn the LTE system, each of the eNBs 1a-05 to 1a-20 corresponds to a conventional Node B in the UMTS system. The eNB is connected to the UE 1a-35 through a wireless channel and performs a more complex role than a conventional Node B. In the LTE system, since all user services including real-time services such as Voice over IP (VoIP) via Internet Protocol are served through a shared channel, a device is required to collect information and perform scheduling accordingly. For example, the collected information may include status information such as the buffer status of the UE, the available transmit power status, and the channel status. According to an embodiment of the present disclosure, the eNBs 1a-05 to 1a-20 are used as a device for performing scheduling. Typically, one eNB controls multiple cells. For example, in order to achieve a transmission rate of 100 Mbps, the LTE system uses orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a wireless access technology in a bandwidth of, for example, 20 MHz. In addition, the LTE system adopts an adaptive modulation and coding (hereinafter referred to as AMC) scheme for determining a modulation scheme and a channel coding rate according to the channel status of the UE. The S-GW 1a-30 is a device that provides a data bearer and generates or removes a data bearer under the control of the MME 1a-25. The MME is a device in charge of various control functions and a mobility management function of the UE and is connected to a plurality of base stations.

[0041] Figure 1b A wireless protocol structure of an LTE system in a wireless communication system according to an embodiment of the present disclosure is shown.

[0042] Reference Figure 1b , the radio protocol of the LTE system includes the packet data convergence protocol (PDCP) 1b-05 or 1b-40, the radio link control (RLC) 1b-10 or 1b-35, and the medium access control (MAC) 1b-15 or 1b-30 on each of the UE and eNB sides. The packet data convergence protocol (PDCP) 1b-05 or 1b-40 is responsible for operations such as IP header compression / reconstruction. The main functions of PDCP are summarized as follows.

[0043] -Header compression and decompression: ROHC only

[0044] - Passing user data

[0045] - In-sequence delivery of upper layer PDUs during PDCP re-establishment for RLC AM

[0046] - For split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception

[0047] - For RLC AM, duplicate check of lower layer SDUs during PDCP re-establishment

[0048] - Retransmission of PDCP SDUs at handover for RLC AM and retransmission of PDCP PDUs during PDCP data recovery for split bearers in DC

[0049] -Encryption and decryption

[0050] - Timer-based SDU discard in uplink

[0051] Radio Link Control (hereinafter referred to as RLC) 1b-10 or 1b-35 reconfigures a PDCP protocol data unit (PDU) into an appropriate size to perform an ARQ operation. The main functions of the RLC are summarized as follows.

[0052] - Delivery of upper layer PDU

[0053] - Error correction via ARQ (AM data transfer only)

[0054] - Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data delivery)

[0055] - Re-segmentation of RLC data PDU (for AM data delivery only)

[0056] - Reordering of RLC data PDUs (only for UM and AM data delivery)

[0057] -Duplicate check (for UM and AM data delivery only)

[0058] -Protocol error checking (AM data transfer only)

[0059] -RLC SDU discard (only for UM and AM data transfer)

[0060] -RLC re-establishment

[0061] MAC 1b-15 or 1b-30 is connected to several RLC layer devices configured in a single terminal, and performs operations of multiplexing RLC PDUs to MAC PDUs and demultiplexing MAC PDUs to RLC PDUs. The main functions of MAC are summarized as follows.

[0062] - Mapping between logical channels and transport channels

[0063] - Multiplex / demultiplex MAC SDUs belonging to one or different logical channels into transport blocks (TBs) delivered to / from the physical layer on transport channels

[0064] -Dispatch information report

[0065] - Error correction via HARQ

[0066] - Priority handling between logical channels of a UE

[0067] - Priority handling between UEs through dynamic scheduling

[0068] -MBMS service identification

[0069] -Transmission format selection

[0070] -filling

[0071] The physical layer 1b-20 or 1b-25 performs channel coding and modulation operations on upper layer data to obtain OFDM symbols and deliver them through a wireless channel, or demodulates OFDM symbols received through a wireless channel, channel-decodes them, and delivers them to an upper layer.

[0072] Figure 1c A structure of a next-generation mobile communication system in a wireless communication system according to an embodiment of the present disclosure is shown.

[0073] Reference Figure 1c As shown therein, the radio access network of the next generation mobile communication system (hereinafter referred to as new radio (NR) or 5G) includes a next generation base station (new radio node B, hereinafter referred to as NR gNB or NR base station) 1c-10 and a new radio core network (NR CN) 1c-05. The user terminal (new radio user equipment, hereinafter referred to as NR UE or NR terminal 1c-15) accesses the external network through the NR gNB 1c-10 and the NR CN 1c-05.

[0074] exist Figure 1c, NR gNB 1c-10 corresponds to an evolved Node B (eNB) of a conventional LTE system. NR gNB 1c-10 is connected to NR UE 1c-15 through a wireless channel and can provide superior services compared to conventional Node Bs. In the next generation mobile communication system, since all user services are served through a shared channel, a device for collecting information and performing scheduling accordingly is required. For example, the collected information may include status information such as the buffer status of the UE, the available transmit power status, and the channel status. According to an embodiment of the present disclosure, NR gNB 1c-10 is used as a device for performing scheduling. Typically, one NR gNB controls multiple cells. In order to achieve data transmission at an ultra-high speed compared to the current LTE, the bandwidth in the next generation mobile communication system may be higher than the existing maximum bandwidth. According to an embodiment of the present disclosure, the next generation mobile communication system may adopt orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a wireless access technology, and may additionally integrate beamforming technology therewith. In addition, the next generation mobile communication system adopts an adaptive modulation and coding (hereinafter referred to as AMC) scheme for determining the modulation scheme and channel coding rate according to the channel status of the UE. NR CN1c-05 performs functions such as mobility support, bearer configuration, and QoS configuration. NR CN is a device responsible for different control functions and mobility management functions for UE, and is connected to multiple base stations. In addition, the next generation mobile communication system can interoperate with the existing LTE system, and NR CN is connected to MME 1c-25 via a network interface. MME is connected to eNB 1c-30, which is an existing base station.

[0075] Figure 1d A wireless protocol structure of a next-generation mobile communication system in a wireless communication system according to an embodiment of the present disclosure is shown.

[0076] Figure 1d A wireless protocol structure of a next-generation mobile communication system to which the present disclosure can be applied is shown.

[0077] Reference Figure 1d , the wireless protocol of the next generation mobile communication system includes NR SDAP 1d-01 or 1d-45, NR PDCP 1d-05 or 1d-40, NR RLC 1d-10 or 1d-35 and NR MAC 1d-15 or 1d-30 on each of the UE and NR base station sides.

[0078] The main functions of NR SDAP 1d-01 or 1d-45 may include some of the following.

[0079] -Transmission of user plane data

[0080] - Mapping between QoS flows and DRBs for DL ​​and UL

[0081] -Mark QoS flow ID in DL and UL packets

[0082] -Reflective QoS flow to DRB mapping for UL SDAP PDU

[0083] For SDAP layer devices, the header of the SDAP layer device or the function of the SDAP layer device can be configured for the UE through an RRC message according to the PDCP layer device or according to the bearer or according to the logical channel. If the SDAP header is configured, the NAS QoS reflection configuration 1-bit indicator (NAS reflection QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflection QoS) of the SDAP header can be indicated by the NR base station, so that the UE can update or reconfigure the mapping information. For example, the mapping information may include mapping information about QoS flows and data bearers for uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. QoS flow ID information can be used as data processing priority, scheduling information, etc., for smooth support of services.

[0084] The main functions of NR PDCP 1d-05 or 1d-40 may include the following functions.

[0085] -Header compression and decompression: ROHC only

[0086] -Transfer of user data

[0087] - In-sequence delivery of upper layer PDUs

[0088] - Out-of-order delivery of upper layer PDUs

[0089] - Reordering of received PDCP PDUs

[0090] - Duplicate check of lower layer SDU

[0091] -Retransmission of PDCP SDU

[0092] -Encryption and decryption

[0093] - Timer-based SDU discard in uplink

[0094] The reordering of the NR PDCP device refers to a function of reordering the PDCP PDUs received from the lower layer in an order based on the PDCP sequence number (SN). The reordering of the NR PDCP device may include a function of delivering data to the upper layer in a reordered order. In addition, the reordering of the NR PDCP device may include a function of directly delivering data without considering the order. According to an embodiment of the present disclosure, the reordering of the NR PDCP device may include a function of rearranging the sequence to record the lost PDCP PDU. According to an embodiment of the present disclosure, the reordering of the NR PDCP device may include a function of reporting the status of the lost PDCP PDU to the transmitting side. According to an embodiment of the present disclosure, the reordering of the NR PDCP device may include a function of requesting the retransmission of the lost PDCP PDU.

[0095] The main functions of NR RLC 1d-10 or 1d-35 may include some of the following functions.

[0096] - Delivery of upper layer PDU

[0097] - In-sequence delivery of upper layer PDUs

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

[0099] - Error correction via ARQ

[0100] - Concatenation, segmentation and reassembly of RLC SDU

[0101] - Re-segmentation of RLC data PDUs

[0102] - Reordering of RLC data PDUs

[0103] - Repeat check

[0104] -Protocol error checking

[0105] -RLC SDU discarded

[0106] -RLC re-establishment

[0107] The in-sequence delivery of the NR RLC device refers to a function of delivering the RLC SDU received from the lower layer to the upper layer in sequence. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include the following functions: if an original RLC SDU is segmented into multiple RLC SDUs and the segmented RLC SDUs are received, the RLC SDUs are reassembled and the reassembled RLC SDUs are delivered. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include a function of rearranging the received RLC PDU with respect to the RLC sequence number (SN) or the PDCP sequence number (SN). According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include a function of rearranging the sequence to record the lost RLC PDU. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include a function of reporting the status of the lost RLC PDU to the transmitting side. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include a function of requesting the retransmission of the lost RLC PDU. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include the following function: if there is a lost RLC SDU, only the RLC SDU before the lost RLC SDU is delivered to the upper layer in sequence. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include the following function: despite the existence of lost RLC SDUs, if a predetermined timer expires, all RLC SDUs received before the timer is started are delivered to the upper layer in sequence. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may include the following function: despite the existence of lost RLC SDUs, if a predetermined timer expires, all RLC SDUs received until the current time are delivered to the upper layer in sequence. According to an embodiment of the present disclosure, the in-sequence delivery of the NR RLC device may process the RLC PDUs in the order of reception (regardless of the order of sequence numbers and the order of arrival) and deliver them to the PDCP device without considering the order (out-of-sequence delivery). According to an embodiment of the present disclosure, in the case where the RLC PDU is segmented, the in-sequence delivery of the NR RLC device may receive the segment stored in the buffer or to be received later, reconfigure it into a complete RLC PDU, and then process and deliver it to the PDCP device. The NR RLC layer may not include a cascading function, and the cascading function may be performed in the NR MAC layer or replaced by a multiplexing function of the NR MAC layer.

[0108] The out-of-order delivery of the NR RLC device refers to a function of directly delivering the RLC SDU received from the lower layer to the upper layer without considering the order. According to an embodiment of the present disclosure, the out-of-order delivery of the NR RLC device may include the following functions: if an original RLC SDU is segmented into multiple RLC SDUs and the segmented RLC SDUs are received, the RLC SDUs are reassembled and the reassembled RLC SDUs are delivered. According to an embodiment of the present disclosure, the out-of-order delivery function of the NR RLC device may include a function of storing the RLC sequence number (SN) or PDCP SN of the received RLC PDU and arranging the sequence to record the lost RLC PDU.

[0109] NR MAC 1d-15 or 1d-30 can be connected to multiple NR RLC layer devices configured in one UE, and the main functions of NR MAC may include some of the following functions.

[0110] - Mapping between logical channels and transport channels

[0111] -Multiplexing / demultiplexing of MAC SDU

[0112] -Dispatch information report

[0113] - Error correction via HARQ

[0114] - Priority handling between logical channels of a UE

[0115] - Priority handling between UEs through dynamic scheduling

[0116] -MBMS service identification

[0117] -Transmission format selection

[0118] -filling

[0119] The NR PHY layer 1d-20 or 1d-25 may perform channel coding and modulation operations of the upper layer data to obtain OFDM symbols and deliver them through a wireless channel. According to an embodiment of the present disclosure, the NR PHY layer may perform the following operations: demodulating the OFDM symbols received through the wireless channel, channel decoding them, and delivering them to the upper layer.

[0120] Figure 1e A method for an unmanned aerial vehicle (UAV) UE to access a cell in a wireless communication system according to an embodiment of the present disclosure is shown.

[0121] The UAV UE may have a feature that enables the possibility of achieving a higher line of sight than that of a terrestrial UE. Therefore, compared with a terrestrial UE, the UAV UE may have the disadvantage of receiving downlink (hereinafter referred to as DL) interference from more cells. That is, the UAV UE may receive a higher level of DL interference from more adjacent cells than the terrestrial UE. Similarly, the UAV UE may cause uplink (hereinafter referred to as UL) interference to more cells than the terrestrial UE. A prohibition method based on the characteristics of the UAV UE is proposed in the present disclosure.

[0122] Reference Figure 1e In operation 1e-05, since no RRC connection with the NR cell 1e-02 is configured, the UAV UE 1e-01 may be in RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0123] In operation 1e-10, the UAV UE 1e-01 in RRC idle mode or RRC inactive state can obtain basic system information and other system information (SIB2, SIB3, etc.) from the NR cell 1e-02. In the present disclosure, the master information block (MIB) and the system information block 1 (SIB1) may be referred to as basic system information. The present disclosure proposes broadcasting information (cellBarred-UAV) indicating whether the UAV UE 1e-01 can access the NR cell 1e-02 via SIB1 or other system information. The information (cellBarred-UAV) may be one bit and may be information indicating whether it is prohibited or not prohibited. The present disclosure proposes that the NR cell broadcast information (intraFreqReselection-UAV) indicating whether a neighboring cell using the same frequency as the NR cell 1e-02 can be reselected via SIB1 or other system information. The information (intraFreqReselection-UAV) may be indicated as "allowed" or "not allowed".

[0124] In operation 1e-15, the UAV UE 1e-01 in RRC idle mode or RRC inactive state can perform a cell selection process based on the basic system information obtained in operation 1e-10. For example, the UAV UE 1e-01 in RRC idle mode or RRC inactive state can search for a suitable NR cell belonging to the selected PLMN or SNPN to perform pre-occupation on the corresponding cell. The cell on which the UAV UE 1e-01 in RRC idle mode or RRC inactive state performs pre-occupation can be referred to as a serving cell. In the present disclosure, based on the 3GPP standard document "38.304: User Equipment (UE) Procedures in Idle Mode and RRC Inactive State", when the conditions in Table 1 below are met, the cell can be defined as a suitable cell.

[0125] [Table 1]

[0126]

[0127]

[0128] For reference, when the following mathematical expression is satisfied, the UAV UE 1e-01 in the RRC idle mode or the RRC inactive state can determine that the cell selection criterion is satisfied.

[0129] [Mathematical expression 1]

[0130] Srxlev>0 and Squal>0

[0131] in

[0132] Srxlev=Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ,

[0133] Squal=Q qualmeas -(Q qualmin +Q qualminoffset )-Qoffset temp .

[0134] The definitions of the parameters used in the mathematical expressions refer to the 3GPP standard document "38.304: User Equipment (UE) Procedures in Idle Mode and RRC Inactive State".

[0135] In operation 1e-15, the UAV UE 1e-01 in RRC idle mode or RRC inactive state proposes not to perform pre-camping on the NR cell 1e-02 when cellBarred-UAV is broadcast via SIB1 or other system information or cellBarred-UAV is indicated as "prohibited". That is, when the cellBarred-UAV information is not broadcast or the cellBarred-UAV information is indicated as "not prohibited", the UAV UE 1e-01 in RRC idle mode or RRC inactive state can perform pre-camping when the NR cell 1e-01 is a suitable cell. For reference, when the cellBarred indicator is set to "prohibited" in the MIB, the UAV UE 1e-01 in RRC idle mode or RRC inactive state can ignore it and determine whether to select or reselect a cell based on the cellBarred-UAV. In the case where the UE is not a UAV UE, access to the corresponding cell may fail i) when the cellBarred indicator in the MIB is indicated as "barred", or ii) when cellReservedForOperatorUse in SIB1 is reserved, cellReservedForOtherUse is true, or cellReservedForFutureUse is true, access to the corresponding cell may fail.

[0136] In operation 1e-20, when intraFreqReselection-UAV in SIB1 or other system information is indicated as "allowed", the UAV UE 1e-01 in RRC idle mode or RRC inactive state can reselect a neighboring cell using the same frequency as the NR cell 1e-02. When intraFreqReselection-UAV is indicated as "not allowed", the UAV UE 1e-01 in RRC idle mode or RRC inactive state cannot reselect a neighboring cell using the same frequency as the NR cell 1e-02 within 300 seconds.

[0137] The present disclosure proposes to apply newly proposed parameters for cell reservation and access restriction (e.g., cellBarred-UAV and / or intraFreqReselection-UAV in SIB) instead of applying conventional cell reservation and access restriction parameters in MIB and SIB1 (e.g., cellBarred and / or intraFreqReselection in MIB).

[0138] Figure 1fA method for an unmanned aerial vehicle (UAV) UE to access a cell in a wireless communication system according to an embodiment of the present disclosure is shown.

[0139] The UAV UE may have a feature that enables the possibility of achieving a higher line of sight than that of a terrestrial UE. Therefore, compared with a terrestrial UE, the UAV UE may have the disadvantage of receiving downlink (hereinafter referred to as DL) interference from more cells. That is, the UAV UE may receive a higher level of DL interference from more adjacent cells than the terrestrial UE. Similarly, the UAV UE may cause uplink (hereinafter referred to as UL) interference to more cells than the terrestrial UE. A prohibition method based on the characteristics of the UAV UE is proposed in the present disclosure.

[0140] Reference Figure 1f In operation 1f-05, since no RRC connection with the NR cell 1f-02 is configured, the UAV UE 1f-01 can be in RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0141] In operation 1f-10, the UAV UE 1f-01 in RRC idle mode or RRC inactive state can obtain basic system information and other system information (SIB2, SIB3, etc.) from the NR cell 1f-02. In the present disclosure, the master information block (MIB) and the system information block 1 (SIB1) may be referred to as basic system information. The present disclosure proposes broadcasting information (cellBarred-UAV) indicating whether the UAV UE 1f-01 can access the NR cell 1e-02 via SIB1 or other system information. The information (cellBarred-UAV) may be one bit and may be information indicating whether it is prohibited or not. The present disclosure proposes that the NR cell broadcast information (intraFreqReselection-UAV) indicating whether the neighboring cell using the same frequency as the NR cell 1e-02 can be reselected via SIB1 or other system information. The information (intraFreqReselection-UAV) may be indicated as "allowed" or "not allowed". The present disclosure proposes that the NR cell broadcasts a height threshold via SIB1 or other system information, which indicates whether the UAV UE 1f-01 applies cellBarred-UAV and / or intraFreqReselection-UAV. According to an embodiment of the present disclosure, when the height of the UAV UE 1f-01 is equal to or greater than the height threshold, the UAV UE 1f-01 can apply cellBarred-UAV and / or intraFreqReselection-UAV.

[0142] In operation 1f-15, the UAV UE 1f-01 in RRC idle mode or RRC inactive state can perform a cell selection process based on the basic system information obtained in operation 1f-10. For example, the UAV UE 1f-01 in RRC idle mode or RRC inactive state can search for a suitable NR cell belonging to the selected PLMN or SNPN to perform pre-occupancy on the corresponding cell. The cell on which the UAV UE 1f-01 in RRC idle mode or RRC inactive state performs pre-occupancy can be referred to as a serving cell. In the present disclosure, based on the 3GPP standard document "38.304: User Equipment (UE) Procedures in Idle Mode and RRC Inactive State", when the conditions in Table 1 below are met, the cell can be defined as a suitable cell. In operation 1f-15, when i) performing a flight at an altitude higher than a height threshold broadcast via system information, or ii) performing a flight at an altitude equal to the height threshold, the UAV UE 1f-01 in RRC idle mode or RRC inactive state may select a cell or reselect a cell by applying cellBarred-UAV broadcast in SIB1 or other system information. When the UAV UE is flying at an altitude lower than the height threshold broadcast via system information, the UAV UE may select or reselect a cell by applying conventional parameters (cellBarred in MIB) broadcast in the MIB. According to an embodiment of the present disclosure, when the UAV UE is flying at an altitude equal to or lower than the height threshold, the UAV UE may select or reselect a cell by applying conventional parameters (cellBarred in MIB) broadcast via the MIB. The UE operation of selecting or reselecting a cell may follow the embodiment described above. For reference, the height threshold may be broadcast via system information or may be determined by the UE itself. When the altitude threshold is determined by itself in the UE, this may mean that the UE itself can determine the altitude threshold and determine whether to apply new parameters (cellBarred-UAV). For reference, when the cellBarred indicator is set to "prohibited" in the MIB, the UAV UE can ignore it and determine whether to select or reselect a cell based on the cellBarred-UAV. In the case where the UE is not a UAV UE or in the case where the application of new parameters is not supported according to the flight altitude, access to the corresponding cell may fail. According to an embodiment of the present disclosure, when the cellBarred indicator in the MIB is "prohibited", access to the corresponding cell may fail.According to an embodiment of the present disclosure, in SIB1, when cellReservedForOperatorUse is reserved, cellReservedForOtherUse is true, or cellReservedForFutureUse is true, access to the corresponding cell may fail.

[0143] In operation 1f-20, when flying at an altitude higher than the altitude threshold broadcast in the system information, the UAV UE 1f-01 in RRC idle mode or RRC inactive state can reselect a neighboring cell that uses the same frequency as the NR cell 1f-02. According to an embodiment of the present disclosure, in operation 1f-20, when flying at an altitude equal to the altitude threshold, the UAV UE 1f-01 in RRC idle mode or RRC inactive state can reselect a neighboring cell that uses the same frequency as the NR cell 1f-02. According to an embodiment of the present disclosure, in operation 1f-20, when intraFreqReselection-UAV is indicated as "allowed" in SIB1 or other system information, the UAV UE 1f-01 can reselect a neighboring cell that uses the same frequency as the NR cell 1f-02. When intraFreqReselection-UAV is indicated as "not allowed", the UAV UE 1f-01 in RRC idle mode or RRC inactive state cannot reselect a neighboring cell using the same frequency as the NR cell 1f-02 within 300 seconds. When flying at an altitude lower than the altitude threshold broadcast in the system information, the UAV UE 1f-01 in RRC idle mode or RRC inactive state can determine the intra-frequency cell reselection (intra-frequency cellreselection) according to conventional parameters (intraFreqReselection). According to an embodiment of the present disclosure, when flying at an altitude equal to or lower than the altitude threshold broadcast in the system information, the UAV UE 1f-01 in RRC idle mode or RRC inactive state can determine the intra-frequency cell reselection according to conventional parameters (intraFreqReselection).

[0144] The present disclosure proposes that when the flying altitude of the UAV UE is equal to or greater than the altitude threshold, the newly proposed new cell reservation and access restriction parameters (for example, cellBarred-UAV and / or intraFreqReselection-UAV in SIB) are applied, instead of applying the conventional cell reservation and access restriction parameters in MIB and SIB1 (cellBarred and / or intraFreqReselection in MIB).

[0145] Figure 1g A method for accessing a cell by an unmanned aerial vehicle (UAV) UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0146] The UAV UE may have a feature that enables the possibility of achieving a higher line of sight than that of a terrestrial UE. Therefore, compared with a terrestrial UE, the UAV UE may have the disadvantage of receiving downlink (hereinafter referred to as DL) interference from more cells. That is, the UAV UE may receive a higher level of DL interference from more adjacent cells than the terrestrial UE. Similarly, the UAV UE may cause uplink (hereinafter referred to as UL) interference to more cells than the terrestrial UE. A prohibition method based on the characteristics of the UAV UE is proposed in the present disclosure.

[0147] Reference Figure 1g In operation 1g-05, since no RRC connection with the NR cell 1g-02 is configured, the UAV UE 1g-01 may be in RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0148] In operation 1g-10, the UAV UE 1g-01 in RRC idle mode or RRC inactive state may obtain basic system information and other system information (SIB2, SIB3, etc.) from the NR cell 1g-02. In the present disclosure, the master information block (MIB) and the system information block 1 (SIB1) may be referred to as basic system information. The new parameters broadcast in SIB1 or other system information may follow the implementation described above. In addition, in the present disclosure, an indicator may be broadcast indicating whether the new parameters are applied according to the UAV UE or according to the altitude at which the UE flies. Specifically, when the new parameters are applied according to the UAV UE, the UAV UE may apply the new parameters according to the altitude at which the UE flies. Figure 1e Apply new parameters, and when instructed to apply new parameters according to the altitude at which the UE is flying, the UAV UE may Figure 1f Apply the new parameters.

[0149] In operation 1g-15, the UAV UE 1g-01 in the RRC idle mode or the RRC inactive state may perform a cell selection process based on the basic system information acquired in operation 1g-10. According to an embodiment of the present disclosure, when SIB1 indicates that a new parameter is applied according to the UAV UE, the UAV UE 1g-01 in the RRC idle mode or the RRC inactive state may perform a cell selection process based on the basic system information acquired in operation 1g-10. Figure 1eIn addition, according to an embodiment of the present disclosure, when SIB1 indicates that new parameters should be applied according to the flight altitude, the UAV UE 1g-01 in the RRC idle mode or the RRC inactive state can apply the new parameters according to the flight altitude. Figure 1f Apply the new parameters.

[0150] In operation 1g-20, when SIB1 or other system information indicates that a new parameter is applied according to the UAV UE, the UAV UE may Figure 1e In addition, in operation 1g-20, when SIB1 or other system information indicates that new parameters should be applied according to the flight altitude, the UAV UE can perform intra-frequency cell reselection according to the flight altitude. Figure 1f Apply the new parameters to perform intra-frequency cell reselection.

[0151] In the present disclosure, NR cell control is to apply the newly proposed parameters of new cell reservation and access restriction (e.g., cellBarred-UAV and / or intraFreqReselection-UAV in SIB) according to UAV UE type or flight altitude.

[0152] Figure 1h A process for performing UE access control in a wireless communication system according to an embodiment of the present disclosure is shown.

[0153] The present disclosure proposes an access identifier and access category dedicated to an unmanned aerial vehicle (UAV) UE or a UE capable of flying, and proposes providing new access control configuration information according to the access identifier and access category, and performing a prohibition check operation through the UE AS to determine whether wireless access is allowed.

[0154] The access identifier is indication information defined in 3GPP, that is, indication information specified in a standard document. The access identifier is used to indicate a specific access, as shown in the following table. The present disclosure proposes a new access identifier. According to an embodiment of the present disclosure, the new access identifier may mean an access identifier applied to a UAV UE, or may mean an access identifier applied to a UE capable of flying when the altitude at which the UE capable of flying flies is equal to or greater than a specific altitude threshold. The new access identifier may mean one of 3 to 10 in Table 2 below.

[0155] [Table 2]

[0156]

[0157]

[0158]

[0159] Access categories are divided into two types. One type is a standardized access category. A standardized access category is a category defined at the RAN level, that is, a category specified in a standard document. Therefore, different operators apply the same standardized access category. All accesses correspond to at least one of the standardized access categories. The other type is an operator-specific (non-standardized) access category. An operator-specific (non-standardized) access category is defined outside of 3GPP and is not specified in a standard document. Therefore, the meaning of an operator-specific access category may vary depending on the operator. This feature is the same as that of the category in the existing ACDC. Access triggered in UE NAS may not be mapped to an operator-specific (non-standardized) access category. A big difference from the existing ACDC is that the operator-specific (non-standardized) access category corresponds not only to an application, but also to an element other than an application, that is, a service type, a call type, a UE type, a user group, a signaling type, a slice type, or a combination of elements other than an application. That is, it is possible to control whether access approval is performed for access belonging to other elements. Access categories are used to indicate specific access, as shown in the following table. Access categories 0 to 7 are used to indicate standardized access categories, while access categories 32 to 63 are used to indicate operator-specific access categories. The present disclosure proposes a new standardized access category. According to an embodiment of the present disclosure, the new standardized access category may mean a standardized access category applied to a UAV UE, or may mean a standardized access category applied to a flight-capable UE when the altitude at which the flight-capable UE flies is equal to or greater than a specific altitude threshold. The new standardized access category may mean one of categories 8 to 31 in Table 3 below.

[0160] [Table 3]

[0161]

[0162]

[0163]

[0164] The operator server 1h-25 provides information (management object (MO)) about operator-specific access category information to the UE NAS through NAS signaling or application-level data transmission. The information (management object (MO)) indicates the elements corresponding to each operator-specific category, such as applications. For example, the access category 32 corresponding to the access corresponding to the Facebook application can be specified in the information (management object (MO)). The base station 1h-20 provides the UE with prohibited configuration information corresponding to each category and a category list for providing prohibited configuration information by using system information. The UE 1h-05 includes logical blocks: NAS1h-10 and AS1h-15.

[0165] UE NAS maps the triggered access to one or more access identifiers and an access category according to a predetermined rule. The mapping operation is performed in all RRC states, namely, connected mode (RRC_CONNECTED), standby mode (RRC_IDLE) and inactive mode (RRC_INACTIVE). The characteristics of each RRC state are listed below.

[0166] RRC_IDLE:

[0167] -UE-specific DRX can be configured by upper layers;

[0168] -UE controlled mobility based on network configuration;

[0169] -UE:

[0170] -Monitor the paging channel;

[0171] -Perform neighbor cell measurements and cell (re)selection;

[0172] -Get system information.

[0173] RRC_INACTIVE:

[0174] -UE-specific DRX can be configured by upper layers or by the RRC layer;

[0175] -UE controlled mobility based on network configuration;

[0176] -UE stores the AS context;

[0177] -UE:

[0178] -Monitor the paging channel;

[0179] -Perform neighbor cell measurements and cell (re)selection;

[0180] -Perform RAN-based notification area updates when moving outside of the RAN-based notification area;

[0181] -Get system information.

[0182] RRC_CONNECTED:

[0183] -UE stores the AS context.

[0184] - Delivery of unicast data to / from UE.

[0185] - At lower layers, the UE may be configured with UE-specific DRX;

[0186] -For UEs supporting CA, use one or more SCells aggregated with SpCell to increase bandwidth;

[0187] -For UEs supporting DC, use an SCG aggregated with the MCG to increase bandwidth;

[0188] - The network controls mobility, i.e. handover within NR and handover to / from E-UTRAN.

[0189] -UE:

[0190] -Monitor the paging channel;

[0191] - monitoring a control channel associated with a shared data channel to determine whether data is scheduled for it;

[0192] -Provide channel quality and feedback information;

[0193] -Perform neighbor cell measurements and measurement reporting;

[0194] -Get system information.

[0195] In another option, in access category mapping, if an access can be mapped to a standardized access category, it can be additionally mapped to an operator-specific access category. The UE NAS delivers the access identity and access category corresponding to the service request to the UE AS.

[0196] In all RRC states, when UE AS receives access identifier or access category information using a message received from UE NAS, a prohibition check operation is performed to determine whether to allow radio access before radio access caused by the message. When radio access is allowed by the prohibition check operation, RRC connection configuration is requested to the network. According to an embodiment of the present disclosure, UE NAS in connected mode or inactive mode sends the access identifier and access category to UE AS due to the following reasons (operation 1h-30). In the present disclosure, the following reasons are collectively referred to as "new session request".

[0197] - New MMTEL voice or video session

[0198] -Send SMS (SMS via IP, or SMS via NAS)

[0199] - New PDU session establishment

[0200] - Modification of existing PDU session

[0201] - Service request to re-establish the user plane for an existing PDU session

[0202] On the other hand, during the service request, the NAS of the UE in the standby mode sends the access identifier and the access category to the UE AS. According to an embodiment of the present disclosure, the new access identifier proposed in the present disclosure may be mapped to a conventional access category. According to an embodiment of the present disclosure, the new access category proposed in the present disclosure may be mapped to a conventional access identifier. According to an embodiment of the present disclosure, the new access identifier proposed in the present disclosure may be mapped to a new access category.

[0203] The UE AS uses the barring configuration information to determine whether to allow access triggered by the UE NAS (barring check).

[0204] Figure 1i is a flowchart of a process of performing access control of a general UE in a wireless communication system according to an embodiment.

[0205] UE 1i-05 includes NAS1i-10 and AS1i-15. NAS performs processes without direct wireless access, namely authentication, service request and session management, and AS performs processes related to wireless access. The network provides management object information to NAS by using OAM (data message at application level) or NAS message (operation 1i-25). The management object information indicates the elements corresponding to each operator-specific access category, such as application. NAS uses the management object information to determine the operator-specific category to which the triggered access is mapped. The triggered access corresponds to a new MMTEL service (voice call or video call), SMS sending, new PDU session establishment, existing PDU session change, etc. When the service is triggered, NAS maps it to an access identifier and access category corresponding to the attributes of the service (operation 1i-30). The service may not be mapped to any access identifier, and may be mapped to one or more access identifiers. In addition, the service may be mapped to an access category. In the assumption that the service can be mapped to an access category, it is first identified whether the service is mapped to the operator-specific access category provided by the measurement object. If the service is not mapped to any operator-specific access category, the service is mapped to a corresponding one of the standardized access categories. In the assumption that a service can be mapped to multiple access categories, one service is mapped to one operator-specific access category and one standardized access category. However, if the service is not mapped to any operator-specific access category, the service is mapped to a corresponding one of the standardized access categories. In the mapping rule, emergency services may be an exception. NAS sends a new session request or service request together with the mapped access identifier and access category to the AS (operation 1i-40). NAS sends a new session request in connected mode or inactive mode, and sends a service request in standby mode. AS receives prohibition configuration information from system information broadcast via the network (operation 1i-35). An example of the ASN.1 structure of the prohibition configuration information is shown in Table 4 below. [Table 4]

[0206] UAC-BarringPerPLMN-List::=SEQUENCE(SIZE(1..maxPLMN))OF UAC-BarringPerPLMN

[0207] UAC-BarringPerPLMN::=SEQUENCE{

[0208] plmn-IdentityIndex INTEGER(1..maxPLMN),

[0209] uac-ACBarringListType CHOICE{

[0210] uac-ImplicitACBarringList SEQUENCE(SIZE

[0211] (maxAccessCat-1))OF UAC-BarringInfoSetIndex,

[0212] uac-ExplicitACBarringList UAC-BarringPerCatList

[0213] }

[0214] }

[0215] UAC-BarringPerCatList::=SEQUENCE(SIZE(1..maxAccessCat-1))OF UAC-BarringPerCat

[0216] UAC-BarringPerCat::=SEQUENCE{

[0217] accessCategory INTEGER(1..maxAccessCat-1),

[0218] uac-barringInfoSetIndex UAC-BarringInfoSetIndex

[0219] }

[0220] UAC-BarringInfoSetIndex::=INTEGER

[0221] (1..maxBarringInfoSet)

[0222] UAC-BarringInfoSetList::=SEQUENCE(SIZE(1..maxBarringInfoSet))OF UAC-BarringInfoSet

[0223] UAC-BarringInfoSet::=SEQUENCE{

[0224] uac-BarringFactor ENUMERATED{

[0225] p00,p05,p10,p15,p20,p25,p30,p40,

[0226] p50,p60,p70,p75,p80,p85,p90,p95},

[0227] uac-BarringTime ENUMERATED{s4,s8,s16,s32,s64,s128,s256,s512},

[0228] uac-BarringForAccessIdentity BIT STRING(SIZE(7))

[0229] }

[0230] The AS uses the corresponding barring configuration information received from the network and the access identifier and access category information mapped by the NAS to determine whether the service request is allowed (operation 1i-45). In the present disclosure, the operation of determining whether the service request is allowed is referred to as a barring check. The UE receives system information including access control configuration information and stores the barring configuration information. Barring configuration information is provided for each PLMN and each access category. The BarringPerCatList information element (IE) is used to provide barring configuration information for access categories belonging to a PLMN. To this end, the PLMN id and the barring configuration information for each access category are included in the BarringPerCatList IE in the form of a list. The access category specific barring configuration information includes an access category id (or index) indicating a specific access category, a uac-BarringForAccessIdentity field, a uac-BarringFactor field, and a uac-BarringTime field. The barring check operation is as follows. First, each bit constituting the uac-BarringForAccessIdentityList corresponds to an access identifier, and when the bit value is indicated as '0', access associated with the access identifier is allowed. For at least one of the mapped access identifiers, access is allowed when at least one of the corresponding bits in uac-BarringForAccessIdentity is '0'. For at least one of the mapped access identifiers, if any of the corresponding bits in uac-BarringForAccessIdentity is not '0', the UE AS performs the additional barring check described below by using the uac-BarringFactor field. The range of uac-Barringfactorα is 0≤α<1. The UE AS derives a random value rand, which corresponds to 0≤rand<1, and considers that if a random value rand is less than uac-BarringFactor, the access is not prohibited, and if not, the access is prohibited. When it is determined that the access is prohibited, the UE AS delays the access attempt by a predetermined time derived below using Equation 2. The UEAS drives a timer having a time value. In the present disclosure, the timer is referred to as a prohibition timer.

[0231] [Equation 2]

[0232] "Tbarring"=(0.7+0.6*rand)*uac-BarringTime.

[0233] When access is prohibited, the UE AS notifies the UE NAS that access is prohibited. When the derived predetermined time expires, the UE AS notifies the UE NAS that access can be requested again (barring mitigation). From this point on, the UE NAS can request access from the UE AS again.

[0234] According to a predetermined rule, when the service request is allowed, the AS requests the network to establish an RRC connection (or resume an RRC connection), or sends data related to a new session to the network (operation 1i-50).

[0235] Figure 1j is a flowchart of a process of performing access control in a wireless communication system according to an embodiment of the present disclosure.

[0236] The UAV UE 1j-05 includes a NAS1j-10 and an AS1j-15. The NAS performs processes without direct wireless access, namely authentication, service request and session management, and the AS performs processes related to wireless access. The network 1j-20 provides management object information to the NAS by using an OAM (data message at the application level) or a NAS message (operation 1j-25). The management object information indicates the elements corresponding to each operator-specific access category, such as an application. The NAS uses the management object information to determine the operator-specific category to which the triggered access is mapped. The triggered access corresponds to a new MMTEL service (voice call or video call), SMS transmission, new PDU session establishment, existing PDU session change, etc. When a service is triggered, the NAS maps it to an access identifier and access category corresponding to the attributes of the service (operation 1j-30). The service may not be mapped to any access identifier, and may be mapped to one or more access identifiers. In addition, the service may be mapped to an access category. In the assumption that the service can be mapped to an access category, it is first identified whether the service is mapped to an operator-specific access category provided by the measurement object. If the service is not mapped to any operator-specific access category, the service is mapped to a corresponding one of the standardized access categories. In the assumption that a service can be mapped to multiple access categories, a service is mapped to an operator-specific access category and a standardized access category. However, if the service is not mapped to any operator-specific access category, the service is mapped to a corresponding one of the standardized access categories. In the mapping rules, emergency services may be exceptions. NAS sends a new session request or service request together with the mapped access identifier and access category to AS (operation 1j-40). NAS sends a new session request in connected mode or inactive mode, and sends a service request in standby mode. As in the embodiment described above, AS receives prohibition configuration information from system information broadcast via the network (operation 1j-35). The present disclosure proposes a new access category (e.g., a new access category mapped to a UAC service), a new access identifier (e.g., a new access identifier mapped to a UAC service) and its new prohibition configuration information that can be applied to UAV UEs via system information broadcast. Specifically, the information may have one of the following meanings.

[0237] - New access category can mean one of 8 to 31.

[0238] - New access identifier can mean one of 3 to 10.

[0239] -New inhibition configuration information can be broadcast in one of the following ways.

[0240] ■Method 1: New prohibited configuration information

[0241] ◆A regular or new access identity mapped to a regular or new access category may imply at least one of the following new barring configuration information.

[0242] uac-BarringFactorUAV: may be broadcast as a value in the range of 0 ≤ uac-BarringFactorUAV < 1. For example, uac-BarringFactorUAV may be broadcast as one of 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.85, 0.9, and 0.95.

[0243] uac-BarringTimeUAV: Indicates the average time until a new access attempt is performed after an access attempt is barred, and may be broadcast as one of the values ​​in seconds. For example, uac-BarringTimeUAV may be broadcast as one of 4s, 8s, 16s, 32s, 64s, 128s, 256s, and 512s.

[0244] ■Method 2: New configuration information to disable zooming

[0245] ◆A regular or new access identity mapped to a regular or new access category may imply at least one of the following new prohibition scaling configuration information.

[0246] ●uac-ScalingBarringFactorUAV: The UE can determine whether access is barred by adding uac-ScalingBarringFactorUAV to the normal uac-BarringFactor and multiplying the normal uac-BarringFactor by uac-ScalingBarringFactorUAV.

[0247] ■

[0248] uac-BarringFactorUAV=uac-BarringFactor+uac-ScalingBarringFactor UAV or uac-BarringFactor*uac-ScalingBarringFactorUAV

[0249] ●uac-ScalingBarringTime: Used when deriving Tbarring, and the barring timer can be derived by adding uac-ScalingBarringTime to uac-BarringTime and multiplying uac-BarringTime by uac-ScalingBarringTime.

[0250] ■

[0251] uac-BarringTimeUAV=uac-BarringTime+uac-ScalingBarringTime or uac-BarringTime*uac-ScalingBarringTime

[0252] The AS uses the corresponding barring configuration information received from the network and the access identifier and access category information mapped by the NAS to determine whether the service request is allowed (operation 1j-45). In the present disclosure, the operation of determining whether the service request is allowed is referred to as a barring check. The UAV UE receives system information including access control configuration information and stores the access control configuration information. Barring configuration information is provided for each public land mobile network (PLMN) and each access category. The BarringPerCatList information element (IE) is used to provide barring configuration information for access categories belonging to a PLMN. To this end, the PLMN id and the barring configuration information for each access category are included in the BarringPerCatListIE in the form of a list. The access category-specific barring configuration information includes an access category id (or index) indicating a specific access category, a uac-BarringForAccessIdentity field, a uac-BarringFactor field, and a uac-BarringTime field. The barring check operation is as follows. First, each bit constituting the uac-BarringForAccessIdentityList corresponds to an access identifier, and when the bit value is indicated as '0', access associated with the access identifier is allowed. For at least one of the mapped access identifiers, access is allowed when at least one of the corresponding bits in uac-BarringForAccessIdentity is '0'. For at least one of the mapped access identifiers, if any of the corresponding bits in uac-BarringForAccessIdentity is not '0', the UE AS performs the additional barring check described below by using the uac-BarringFactorUAV field. The range of uac-Barringfactorα is 0≤α<1. The UE AS derives a random value rand, which corresponds to 0≤rand<1, and considers that if a random value rand is less than uac-BarringFactorUAV, the access is not barred, if not, the access is barred. When it is determined that the access is barred, the UE AS delays the access attempt by a predetermined time derived below using Equation 3. The UE AS drives a timer having a time value. In the present disclosure, the timer is referred to as a barring timer.

[0253] [Equation 3]

[0254] "Tbarring"=(0.7+0.6*rand)*uac-BarringTimeUAV

[0255] When access is barred, the UE AS notifies the UE NAS. When the derived predetermined time expires, the UE AS notifies the UE NAS that access can be requested again (barring mitigation). From this point on, the UE NAS can request access from the UE AS again.

[0256] According to predetermined rules, when the service request is allowed, the AS requests the network to establish an RRC connection (or resume an RRC connection), or sends new session-related data to the network (operation 1j-50).

[0257] In the present disclosure, in the case of UAV UE, when new access category information, new access identification information, and new prohibition configuration information for UAV UE are broadcast in system information, the UAV UE can apply it to check prohibition. Even in the case of UAV UE, when new access category information, new access identification information, and new prohibition configuration information are not broadcast in system information, prohibition can be checked according to the implementation described above.

[0258] Figure 1k is a flowchart of a process of performing access control in a wireless communication system according to an embodiment of the present disclosure.

[0259] The UAV UE 1K-05 includes a NAS 1K-10 and an AS 1K-15. The NAS performs processes without direct wireless access, namely authentication, service request, and session management, and the AS performs processes related to wireless access. The network 1k-20 provides management object information to the NAS by using an OAM (data message at the application level) or a NAS message (operation 1k-25). The management object information indicates the elements corresponding to each operator-specific access category, such as an application. The NAS uses the management object information to determine the operator-specific category to which the triggered access is mapped. The triggered access corresponds to a new MMTEL service (voice call or video call), SMS transmission, new PDU session establishment, existing PDU session change, etc. When a service is triggered, the NAS maps it to an access identifier and access category corresponding to the attributes of the service (operation 1k-30). The service may not be mapped to any access identifier, and may be mapped to one or more access identifiers. In addition, the service may be mapped to an access category. In the assumption that the service can be mapped to an access category, it is first identified whether the service is mapped to an operator-specific access category provided by the measurement object. If the service is not mapped to any operator-specific access category, the service is mapped to a corresponding one of the standardized access categories. In the assumption that a service can be mapped to multiple access categories, a service is mapped to an operator-specific access category and a standardized access category. However, if the service is not mapped to any operator-specific access category, the service is mapped to a corresponding one of the standardized access categories. In the mapping rule, emergency services may be an exception. NAS sends a new session request or service request together with the mapped access identifier and access category to AS (operation 1k-40). NAS sends a new session request in connected mode or inactive mode, and sends a service request in standby mode. As in the embodiment described above, AS receives prohibition configuration information from system information broadcast via the network (operation 1k-35). The present disclosure proposes a new access category (e.g., a new access category mapped to a UAC service), a new access identifier (e.g., a new access identifier mapped to a UAC service), and its new prohibition configuration information that can be applied to UAV UEs flying at an altitude equal to or greater than an altitude threshold via system information broadcast. For example, if the altitude of the UAV UE is equal to or greater than the altitude threshold, the UAV UE may apply the new prohibition configuration information, if not, the UAV UE may apply the conventional prohibition configuration information. The altitude threshold may be broadcast via system information, or may be determined in the UAV UE itself. The new information may have at least one of the following meanings.

[0260] - New access category can mean one of 8 to 31.

[0261] - New access identifier can mean one of 3 to 10.

[0262] -New inhibition configuration information can be broadcast in one of the following ways.

[0263] ■Method 1: New prohibited configuration information

[0264] ◆ A regular or new access identifier mapped to a regular or new access category may imply at least one of the following new barring configuration information:

[0265] uac-BarringFactorUAV: may be broadcast as a value in the range of 0 ≤ UAC-BarringFactorUAV < 1. For example, uac-BarringFactorUAV may be broadcast as one of 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.85, 0.9, and 0.95.

[0266] uac-BarringTimeUAV: Indicates the average time until a new access attempt is performed after an access attempt is barred, and may be broadcast as one of the values ​​in seconds. For example, uac-BarringTimeUAV may be broadcast as one of 4s, 8s, 16s, 32s, 64s, 128s, 256s, and 512s.

[0267] ■Method 2: New configuration information to disable zooming

[0268] ◆A regular or new access identity mapped to a regular or new access category may imply at least one of the following new prohibition scaling configuration information.

[0269] ●uac-ScalingBarringFactorUAV: The UE can determine whether access is barred by adding uac-ScalingBarringFactorUAV to the normal uac-BarringFactor and multiplying the normal uac-BarringFactor with uac-ScalingBarringFactorUAV.

[0270] ■uac-BarringFactorUAV=uac-BarringFactor+uac-ScalingBarringFactorUAV or uac-BarringFactor*uac-ScalingBarringFactorUAV

[0271] ●uac-ScalingBarringTime: Used when deriving Tbarring, and the barring timer can be derived by adding uac-ScalingBarringTime to uac-BarringTime and multiplying uac-BarringTime by uac-ScalingBarringTime.

[0272] ■uac-BarringTimeUAV=uac-BarringTime+uac-ScalingBarringTime or uac-BarringTime*uac-ScalingBarringTime

[0273] The AS uses the corresponding barring configuration information received from the network and the access identifier and access category information mapped by the NAS to determine whether the service request is allowed (operation 1k-45). In the present disclosure, the operation of determining whether the service request is allowed is referred to as a barring check. In the present disclosure, when the UAV UE flies at an altitude equal to or greater than the altitude threshold, the UEAS performs a barring check operation according to the new barring configuration information. The UAV UE receives system information including access control configuration information and stores the access control configuration information. Barring configuration information is provided for each public land mobile network (PLMN) and each access category. The BarringPerCatList information element (IE) is used to provide barring configuration information for access categories belonging to one PLMN. To this end, the PLMN id and the barring configuration information for each access category are included in the BarringPerCatList IE in the form of a list. The access category-specific barring configuration information includes an access category id (or index) indicating a specific access category, a uac-BarringForAccessIdentity field, a uac-BarringFactor field, and a uac-BarringTime field. The barring check operation is as follows. First, each bit constituting the uac-BarringForAccessIdentityList corresponds to an access identifier, and when the bit value is indicated as '0', access associated with the access identifier is allowed. For at least one of the mapped access identifiers, when at least one of the corresponding bits in uac-BarringForAccessIdentity is '0', access is allowed. For at least one of the mapped access identifiers, if any of the corresponding bits in uac-BarringForAccessIdentity is not '0', the UE AS performs the additional prohibition check described below by using the uac-BarringFactorUAV field. The range of uac-BarringFactorUAVα is 0≤α<1. The UE AS derives a random value rand, which corresponds to 0≤rand<1, and considers that if a random value rand is less than uac-BarringFactor, the access is not prohibited, and if not, the access is prohibited. When it is determined that the access is prohibited, the UE AS delays the access attempt for a predetermined time derived below using Equation 3. The UE AS drives a timer having a time value. In the present disclosure, the timer is referred to as a prohibition timer.

[0274] When access is prohibited, the UE AS notifies the UE NAS. When the derived predetermined time expires, the UE AS notifies the UE NAS that access can be requested again (barring mitigation). From this point on, the UE NAS can request access from the UE AS again.

[0275] According to a predetermined rule, when the service request is allowed, the AS requests the network to establish an RRC connection (or resume an RRC connection), or sends new session-related data to the network (operation 1k-50).

[0276] In the present disclosure, the UAC UE may fly at an altitude equal to or greater than the altitude threshold and perform access control according to the new configuration information. When the UAC UE flies at an altitude lower than the altitude threshold, access control may be performed according to conventional configuration information. According to an embodiment of the present disclosure, when the UAC UE flies at an altitude lower than the altitude threshold or flies at an altitude equal to the altitude threshold, access control may be performed according to conventional configuration information.

[0277] Figure 1l It is shown that a new physical random access channel (PRACH) parameter priority is configured by an NR base station for a UAV UE in a wireless communication system according to an embodiment of the present disclosure.

[0278] Reference Figure 1l , UAV UE 1l-01 can be in RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE) without configuring an RRC connection with the NR base station 1l-20 (operation 1l-05). Alternatively, UAV UE1l-01 can be in RRC connection mode by configuring an RRC connection with the NR base station 1l-02 (operation 1l-05).

[0279] In operation 11-10, the UAV UE 11-01 may receive a new PRACH priority parameter from the NR base station 11-02. In the present disclosure, the new PRACH priority parameter may have at least one of the following meanings.

[0280] scalingFactorBIUAV: is the scaling factor used when performing the priority random access procedure.

[0281] powerRamingStepHighpriorityUAV: is the power boost factor used when performing the priority random access procedure.

[0282] For reference, the NR base station 11-02 can provide a new PRACH priority parameter to the UAV UE via system information or dedicated RRC signaling. For reference, the new PRACH parameter priority can be used for UEs configured with beam failure recovery, switching, mission critical service (MCS) / mission priority service (MPS) and new UAV access identification. The new PRACH parameter priority can be used for 2-step random access and 4-step random access procedures.

[0283] In operation 1l-15, UAV UE 1l-01 can apply new PRACH priority parameters received from NR base station 1l-02.

[0284] In operation 1l-20, UAV UE 1l-01 can initiate a priority random access process with NR base station 1l-02 by applying new PRACH priority parameters.

[0285] Figure 1m is a block diagram showing an internal structure of a UE in a wireless communication system according to an embodiment of the present disclosure.

[0286] Reference Figure 1m , the UE may include a radio frequency (RF) processor 1m-10, a baseband processor 1m-20, a memory 1m-30, and a controller 1m-40.

[0287] The RF processor 1m-10 performs functions for transmitting or receiving signals via a wireless channel, such as frequency band conversion and amplification of the signal. That is, the RF processor 1m-10 up-converts the baseband signal provided from the baseband processor 1m-20 into an RF band signal, and then transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processor 1m-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like. Figure 1m Only one antenna is shown, but the UE may include multiple antennas. In addition, the RF processor 1m-10 may include multiple RF chains. In addition, the RF processor 1m-10 may perform beamforming. For beamforming, the RF processor 1m-10 may adjust the phase and amplitude of each signal sent or received through multiple antennas or antenna elements. In addition, the RF processor may perform MIMO and may receive multiple layers when performing MIMO operations.

[0288] The baseband processor 1m-20 performs the conversion function between the baseband signal and the bit stream according to the physical layer standard of the system. For example, during data transmission, the baseband processor 1m-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 1m-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1m-10. For example, in accordance with the OFDM method, when transmitting data, the baseband processor 1m-20 performs encoding and modulation of the transmitted bit stream to generate complex symbols, maps the complex symbols to subcarriers, and then configures OFDM symbols via an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processor 1m-20 divides the baseband signal provided from the RF processor 1m-10 into units of OFDM symbols, recovers the signal mapped to the subcarrier by a fast Fourier transform (FFT) operation, and then recovers the received bit stream by demodulation and decoding.

[0289] The baseband processor 1m-20 and the RF processor 1m-10 send and receive signals as described above. Therefore, each of the baseband processor 1m-20 and the RF processor 1m-10 can be referred to as a transmitter, a receiver, a transceiver or a conversion unit. In addition, at least one of the baseband processor 1m-20 and the RF processor 1m-10 may include multiple communication modules supporting different multiple wireless access technologies. In addition, at least one of the baseband processor 1m-20 and the RF processor 1m-10 may include different communication modules to process signals in different frequency bands. For example, different wireless access technologies may include wireless LAN (e.g., IEEE802.11), cellular networks (e.g., LTE), and the like. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NRHz, NRHz) bands and millimeter wave (e.g., 60GHz) bands.

[0290] The memory 1m-30 may store data such as basic programs, applications or configuration information for UE operation. In particular, the memory 1m-30 stores information related to a second access node that performs wireless communication by using a second radio access technology. In addition, the memory 1m-30 provides stored data according to a request from the controller 1m-40.

[0291] The controller 1m-40 controls the overall operation of the UE. For example, the controller 1m-40 sends or receives a signal through the baseband processor 1m-20 and the RF processor 1m-10. In addition, the controller 1m-40 records data in the memory 1m-30 and reads data from the memory 1m-30. To this end, the controller 1m-40 may include at least one processor. For example, the controller 1m-40 may include a communication processor that performs control for communication and an application processor (AP) that controls high layers such as applications.

[0292] Figure 1n is a block diagram showing the configuration of an NR base station in a wireless communication system according to an embodiment of the present disclosure.

[0293] Reference Figure 1n , the base station may include an RF processor 1n-10, a baseband processor 1n-20, a backhaul communication unit 1n-30, a memory 1n-40, and a controller 1n-50.

[0294] The RF processor 1n-10 performs functions such as frequency band conversion and amplification of signals for transmitting or receiving signals via a wireless channel. That is, the RF processor 1n-10 up-converts the baseband signal provided by the baseband processor 1n-20 into an RF band signal, and then transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processor 110 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC and / or an analog-to-digital converter (ADC), etc. Figure 1n , although only one antenna is shown, the first connection node may include multiple antennas. In addition, the RF processor 110 may include multiple RF chains. In addition, the RF processor 110 may perform beamforming. For beamforming, the RF processor 110 may adjust the phase and amplitude of each signal sent or received through multiple antennas or antenna elements. The RF processor may perform downlink MIMO operations by sending one or more layers.

[0295] The baseband processor 1n-20 performs a conversion function between a baseband signal and a bit stream according to the physical layer standard of the first wireless access technology. For example, during data transmission, the baseband processor 1n-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 1n-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1n-10. For example, in accordance with the OFDM method, when transmitting data, the baseband processor 1n-20 performs encoding and modulation of the transmitted bit stream to generate complex symbols, maps the complex symbols to subcarriers, and then configures OFDM symbols by IFFT operation and CP insertion. In addition, when receiving data, the baseband processor 1n-20 divides the baseband signal provided from the RF processor 1n-10 into units of OFDM symbols, recovers the signal mapped to the subcarrier by FFT operation, and then recovers the received bit stream by demodulation and decoding. The baseband processor 1n-20 and the RF processor 1n-10 send and receive signals as described above. Therefore, each of the baseband processor 1n-20 and the RF processor 1n-10 can be referred to as a transmitter, a receiver, a transceiver, or a wireless communication unit.

[0296] The backhaul communication unit 1n-30 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 1n-30 converts a bit stream sent from the main base station to another node (such as an auxiliary base station or a core network) into a physical signal, and converts a physical signal received from another node into a bit stream.

[0297] The memory 1n-40 stores data such as basic programs, applications, and configuration information for the operation of the master base station. In particular, the memory 1n-40 can store information about the bearers assigned to the connected UE, measurement results reported from the connected UE, and the like. In addition, the memory 1n-40 can store information used as a criterion for determining whether to provide or stop multiple connections to the UE. In addition, the memory 1n-40 provides the stored data upon request from the controller 1n-50.

[0298] The controller 1n-50 controls the overall operation of the master base station. For example, the controller 1n-50 sends or receives a signal through the baseband processor 1n-20 and the RF processor 1n-10 or through the backhaul communication unit 1n-30. In addition, the controller 1n-50 records data in the memory 1n-40 and reads data from the memory 1n-40. To this end, the controller 1n-50 may include at least one processor.

[0299] According to different embodiments of the present disclosure, a method performed by an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state may be provided. The method may include: receiving a message including system information from a base station, wherein the system information includes first information indicating whether the UAV UE can be connected; and in response to the received message including the system information, performing pre-occupation on the base station based on the first information.

[0300] According to an embodiment of the present disclosure, the method may further include performing pre-camping on the base station based on the second information, wherein the system information further includes second information indicating a height threshold.

[0301] According to an embodiment of the present disclosure, the method may include performing camping on another base station different from the base station based on third information, wherein the system information further includes third information indicating whether a cell using the same frequency can be reselected.

[0302] According to an embodiment of the present disclosure, the system information may include at least one of a master information block (MIB) or a system information block #1 (SIB1).

[0303] According to different embodiments of the present disclosure, a method performed by a base station may be provided. The method may include: sending a message including system information to an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state, wherein the system information includes first information indicating that the UAV UE can be connected; and in response to the sent message including the system information, performing communication with the UAV UE in the RRC_IDLE or RRC_INACTIVE state based on the first information.

[0304] According to an embodiment of the present disclosure, the method may further include performing communication with the UAV UE in the RRC_IDLE or RRC_INACTIVE state based on the second information, wherein the system information further includes second information indicating the altitude threshold.

[0305] According to an embodiment of the present disclosure, the system information may further include third information indicating whether a cell using the same frequency can be reselected.

[0306] According to different embodiments of the present disclosure, an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state may be provided. The UAV UE in the RRC_IDLE or RRC_INACTIVE state may include a transceiver and a controller connected to the transceiver, wherein the controller is configured to: receive a message including system information from a base station, the system information including first information indicating whether the UAV UE can be connected; and in response to the received message including the system information, perform pre-occupation on the base station based on the first information.

[0307] According to different embodiments of the present disclosure, a base station may include a transceiver and a controller connected to the transceiver, wherein the controller is configured to: send a message including system information to an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state, the system information including first information indicating that the UAV UE can be connected; and in response to the sent message including the system information, perform communication with the UAV UE in the RRC_IDLE or RRC_INACTIVE state based on the first information.

[0308] The present disclosure provides a method for an unmanned aerial vehicle (UAV) UE in a radio resource control RRC_IDLE or RRC_INACTIVE state, comprising: receiving a message including system information, wherein the system information includes first information indicating whether the UAV UE can be connected, second information indicating whether the UAV UE can reselect a neighboring cell using the same frequency, and third information indicating an altitude threshold; in a case where the altitude of the UAV UE is equal to or greater than the altitude threshold, performing pre-occupation on a cell based on the first information indicating whether the UAV UE can be connected; and in a case where the altitude of the UAV UE is equal to or greater than the altitude threshold, reselecting a neighboring cell using the same frequency as the cell based on the second information indicating whether the UAV UE can reselect a neighboring cell using the same frequency.

[0309] The methods disclosed in the claims and / or the methods according to the embodiments described in the specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0310] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. At least one program includes instructions that command an electronic device to perform the method according to different embodiments of the present disclosure as defined in the attached claims and / or disclosed therein.

[0311] These programs (software modules or software) can be stored in non-volatile memory including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage device, compact disk ROM (CD-ROM), digital versatile disk (DVD) or other types of optical storage devices, or magnetic tape cassettes. Alternatively, any combination of some or all of them can form a memory storing the program. In addition, a plurality of such memories can be included in the electronic device.

[0312] In addition, the program can be stored in a connectable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), and a storage area network (SAN), or a combination thereof. Such a storage device can access the electronic device via an external port. In addition, a separate storage device on a communication network can access a portable electronic device.

[0313] In the specific embodiments described above of the present disclosure, the elements included in the present disclosure are represented in the singular or plural according to the specific embodiments proposed. However, for the convenience of description, the singular form or the plural form is selected to be suitable for the proposed situation, and the present disclosure is not limited by the elements represented in the singular or plural. Therefore, the elements represented in the plural may also include a single element, or the elements represented in the singular may also include multiple elements.

[0314] Although specific embodiments have been described in the detailed description of the present disclosure, it is obvious that different modifications and changes may be made thereto without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the limitations of the embodiments set forth herein, but should be defined by the attached claims described below and their equivalents. In other words, it is obvious to those skilled in the art that other variations based on the technical ideas of the present disclosure can be implemented. In addition, the above various embodiments may be used in combination as needed. For example, the methods proposed in the present disclosure may be partially combined with each other to operate network entities and terminals. In addition, although the above embodiments have been described based on 5G and NR systems, other variations based on the technical ideas of the embodiments may also be implemented in other communication systems such as LTE, LTE-A, and LTE-A-Pro systems.

Claims

1. A method performed by an unmanned aerial vehicle (UAV) terminal in a radio resource control (RRC_IDLE) or RRC_INACTIVE state, the method comprising: receiving a message including system information from a base station, wherein the system information includes first information indicating whether the UAV terminal can be connected; and In response to the received message including the system information, camping is performed on the base station based on the first information.

2. The method according to claim 1, further comprising: performing camping on the base station based on the second information, The system information also includes the second information, and the second information indicates a height threshold.

3. The method according to claim 1, further comprising: performing camping on another base station different from the base station based on the third information, The system information further includes the third information, and the third information indicates whether the cell using the same frequency can be reselected.

4. The method according to claim 1, wherein: The system information includes at least one of a master information block MIB or a system information block #1 SIB1.

5. A method performed by a base station, the method comprising: Sending a message including system information to an unmanned aerial vehicle UAV terminal in a radio resource control RRC_IDLE or RRC_INACTIVE state, The system information includes first information, and the first information indicates whether the UAV terminal can be connected; and In response to the sent message including the system information, communication with the UAV terminal in the UAV_IDLE or RRC_INACTIVE state is performed based on the first information.

6. The method according to claim 5, further comprising: performing communication with the UAV terminal in the UAV_IDLE or RRC_INACTIVE state based on the second information, The system information also includes the second information, and the second information indicates a height threshold.

7. The method according to claim 5, wherein: The system information further includes third information indicating whether cells using the same frequency can be reselected.

8. An unmanned aerial vehicle (UAV) terminal in a radio resource control (RRC_IDLE) or (RRC_INACTIVE) state, the terminal comprising: Transceiver; as well as A controller connected to the transceiver, Wherein, the controller is configured as: receiving a message including system information from a base station, The system information includes first information, and the first information indicates whether the UAV terminal can be connected; and In response to the received message including the system information, camping is performed on the base station based on the first information.

9. The terminal according to claim 8, wherein: The system information further includes second information indicating a height threshold, and The controller is further configured to: perform pre-occupancy on the base station based on the second information.

10. The terminal according to claim 8, wherein: The system information further includes third information indicating whether the cell using the same frequency can be reselected, and The controller is further configured to: perform pre-occupation on another base station different from the base station based on the third information.

11. The terminal according to claim 8, wherein: The system information includes at least one of a master information block MIB or a system information block #1 SIB1.

12. A base station, comprising: Transceiver; as well as A controller connected to the transceiver, Wherein, the controller is configured as: Sending a message including system information to an unmanned aerial vehicle UAV terminal in a radio resource control RRC_IDLE or RRC_INACTIVE state, The system information includes first information, and the first information indicates whether the UAV terminal can be connected; and In response to the sent message including the system information, communication with the UAV terminal in the RRC_IDLE or RRC_INACTIVE state is performed based on the first information.

13. The base station according to claim 12, wherein: The system information further includes second information indicating a height threshold, and The controller is further configured to: perform communication with the UAV terminal in the RRC_IDLE or RRC_INACTIVE state based on the second information.

14. The base station according to claim 12, wherein: The system information further includes third information indicating whether cells using the same frequency can be reselected.

15. The base station according to claim 12, wherein: The system information includes at least one of a master information block MIB or a system information block #1 SIB1.

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