Method and apparatus for determining mobility state in next generation mobile communication system

Abstract

The present disclosure relates to a mobile communication system terminal and base station operation, and specifically, to a communication technique for determining a mobility state and a system therefor. A method performed by a terminal in a wireless communication system of the present disclosure comprises the steps of: receiving a message including a parameter for determining a mobility state of the terminal from a base station; identifying, from the message, information for determining a mobility state of an unmanned aerial vehicle (UAV) terminal; and determining the mobility state of the terminal based on the information for determining the mobility state of the UAV terminal.

Description

Technical Field

[0001] The present disclosure relates to operations of a base station and a terminal in a mobile communication system, and in particular to a method and apparatus for determining a mobility state. Background Art

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

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

[0004] Currently, in view of the services to be supported by 5G mobile communication technologies, discussions are ongoing on improvements and performance enhancements of initial 5G mobile communication technologies, and there is already physical layer standardization on technologies such as: Vehicle-to-Everything (V2X), for assisting driving decisions of autonomous vehicles based on information about the location and status of the vehicle transmitted by the vehicle and for enhancing user convenience; New Radio Unlicensed (NR-U), for system operation that is intended to comply with various regulatory-related requirements in unlicensed frequency bands; NR UE power saving; Non-Terrestrial Network (NTN), which is UE satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] In addition, there is already ongoing standardization in the air interface architecture / protocol on technologies such as the Industrial Internet of Things (IIoT) that supports new services through interconnection and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner, mobility enhancements including conditional handover and dual active protocol stack (DAPS) handover, and two-step random access for simplifying the random access procedure (e.g., two-step random access channel (RACH) for NR). Standardization is also ongoing on system architecture / services for 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 UE location-based services.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of connected devices will be connected to the communication network, and it is accordingly expected that enhanced functions and performance of the 5G mobile communication system and integrated operations of the connected devices will be necessary. To this end, new research related to extended reality (XR) is arranged to effectively support augmented reality (AR), virtual reality (VR), mixed reality (MR), etc., to improve 5G performance and reduce complexity by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, meta-service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a foundation for developing not only new waveforms for providing coverage in the terahertz band for 6G mobile communication technology, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), 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 also full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and improving system networks, AI-based communication technology for achieving system optimization by leveraging 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] As described above, with the development of mobile communication systems, various services can be provided, and a scheme for efficiently providing these services according to the mobility status of a terminal is required. Summary of the invention

[0009]

Technical issues

[0010] The present disclosure relates to a wireless communication system and operations of a base station and a terminal in the mobile communication system related to mobility state determination.

[0011]

Technical solution

[0012] According to an embodiment of the present disclosure, a method performed by a terminal in a wireless communication system may include: receiving a message including parameters for determining a mobility state of a terminal from a base station; identifying information for determining a mobility state of an unmanned aerial vehicle (UAV) terminal in the message; and determining the mobility state of the terminal based on the information for determining the mobility state of the UAV terminal.

[0013] According to an embodiment, the message may include a first parameter set for determining a mobility state of a normal terminal and a second parameter set for determining a mobility state of a UAV terminal.

[0014] According to an embodiment, the message may include a parameter set for determining the mobility state of a normal terminal and a scaling factor for determining the mobility state of a UAV terminal, and the scaling factor for determining the mobility state of the UAV terminal may be applied to the parameter set.

[0015] According to an embodiment, the message may include at least one of a Radio Resource Control (RRC) connection release message or a System Information Block (SIB) message.

[0016] According to an embodiment, the method may further include sending the determined mobility state of the terminal to the base station.

[0017] According to another embodiment of the present disclosure, a terminal in a wireless communication system may include: a transceiver that sends and receives signals; and a controller that is configured to receive a message including parameters for determining a mobility state of a terminal from a base station, identify information for determining the mobility state of an unmanned aerial vehicle (UAV) terminal in the message, and determine the mobility state of the terminal based on the information for determining the mobility state of the UAV terminal.

[0018] According to another embodiment of the present disclosure, a method performed by a base station in a wireless communication system may include: sending a message including parameters for determining a mobility state of the terminal to a terminal; and receiving the mobility state of the terminal from the terminal, wherein the received mobility state of the terminal is determined by the terminal based on information in the message for determining the mobility state of an unmanned aerial vehicle (UAV) terminal.

[0019] According to another embodiment of the present disclosure, a base station in a wireless communication system may include: a transceiver that sends and receives signals; and a controller that is configured to send a message including parameters for determining a mobility state of the terminal to a terminal, and receive the mobility state of the terminal from the terminal, wherein the received mobility state of the terminal is determined by the terminal based on information in the message for determining the mobility state of an unmanned aerial vehicle (UAV) terminal.

[0020]

Beneficial effects

[0021] In the case where a terminal moving at high speed follows conventional mobility state determination, it may enter a medium mobility state or a high mobility state much later despite the high speed. However, according to an embodiment of the present disclosure, the terminal can enter a medium mobility state or a high mobility state faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1A is a diagram showing a structure of an LTE system according to an embodiment of the present disclosure.

[0023] FIG. 1B is a diagram illustrating a radio protocol structure in an LTE system according to an embodiment of the present disclosure.

[0024] FIG. 1C is a diagram illustrating a structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0025] FIG. 1D is a diagram illustrating a radio protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0026] FIG. 1E is a diagram illustrating that a UE in an RRC idle mode (RRC_IDLE) or an RRC inactive state (RRC_INACTIVE) performs a cell reselection evaluation procedure in a next generation mobile communication system according to an embodiment of the present disclosure.

[0027] Figure 1G is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a typical NR mobile communication system according to an embodiment of the present disclosure.

[0028] Figure 1H is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0029] Figure 1H is a flowchart showing the process of a UE reporting a mobility status to an NR base station in an NR system proposed according to an embodiment of the present disclosure.

[0030] Figure 1I is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0031] Figure 1J is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0032] Figure 1K is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0033] Figure 1L is a flowchart showing a process in which a UE reports flight path information to an NR base station through an RRC connection recovery process in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0034] FIG. 1M is a block diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0035] Figure 1N is a block diagram showing the structure of an NR base station according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] 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, when a detailed description of a known function or configuration incorporated herein may make the subject matter of the present disclosure unnecessarily unclear, the detailed description of the known function or configuration incorporated herein will be omitted. 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 habit. Therefore, the definition of the terms should be based on the content of the entire specification.

[0037] In the following description of the present disclosure, when a detailed description of a known function or configuration incorporated herein may make the subject matter of the present disclosure unnecessarily unclear, a detailed description of the known function or configuration incorporated herein will be omitted. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0038] In the following description, for the sake of convenience, terms for identifying access nodes, terms about network entities, terms about messages, terms about interfaces between network entities, terms about various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms about subjects with equivalent technical meanings may be used.

[0039] In the following description, for ease of description, the present disclosure will be described using names and terms defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited by these terms and names and can be applied to systems conforming to other standards in the same manner. In the present disclosure, the term eNB can be used interchangeably with the term gNB. That is, a base station described as an eNB can indicate a gNB.

[0040] FIG. 1A is a diagram showing a structure of an LTE system according to an embodiment of the present disclosure.

[0041] 1A , a radio access network of an LTE system may include next generation evolved Node Bs (hereinafter referred to as evolved Node B (eNB) Node Bs or base stations) 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 1a-35 (hereinafter referred to as UE or terminal) may access an external network through eNBs 1a-05 to 1a-20 and S-GW 1a-30.

[0042] In FIG. 1A , eNBs 1a-05 to 1a-20 may correspond to conventional Node Bs of a Universal Mobile Telecommunications System (UTMS). The eNB is connected to UE 1a-35 through a radio channel and may perform a more complex role than a conventional Node B. In an LTE system, since all user services including real-time services such as voice over IP (VoIP) over Internet Protocol are served through a shared channel, a device for collecting and scheduling status information about a buffer status, an available transmission power status, and a channel status of a UE is required, and eNBs 1a-05 to 1a-20 may be used as the device. Typically, one eNB may control multiple cells. For example, in order to achieve a transmission rate of 100 Mbps, an LTE system may use orthogonal frequency division multiplexing (OFDM) as a wireless access technology in a bandwidth of 20 MHz. In addition, an adaptive modulation and coding (AMC) scheme that determines a modulation scheme and a channel coding rate may be applied depending on the channel status of the UE. The S-GW 1a-30 is a device for providing a data bearer, and can generate or remove a data bearer under the control of the MME 1a-25. The MME is a device for performing not only a function of managing mobility of UE but also various control functions, and can be connected to a plurality of eNBs.

[0043] FIG. 1B is a diagram illustrating a radio protocol structure in an LTE system according to an embodiment of the present disclosure.

[0044] Referring to FIG. 1B , in the radio protocol of the LTE system, the UE and the eNB may include packet data convergence protocol (PDCP) 1b-05 and 1b-40, radio link control (RLC) 1b-10 and 1b-35, and medium access control (MAC) 1b-15 and 1b-30, respectively. Packet data convergence protocol (PDCP) 1b-05 and 1b-40 may perform operations of compressing / reconstructing IP headers. The main functions of PDCP are described below.

[0045] - Header compression and decompression function (Header compression and decompression: ROHC only)

[0046] -User data transmission function (transmission of user data)

[0047] - In-sequence delivery function (in-sequence delivery of upper layer PDUs during PDCP re-establishment for RLC AM)

[0048] - Sequence re-arrangement functionality (for split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU re-ordering for reception)

[0049] - Duplicate detection function (duplicate detection of lower layer SDUs during PDCP re-establishment for RLC AM)

[0050] - Retransmission functionality (for RLC AM, retransmission of PDCP SDUs at handover, and retransmission of PDCP PDUs for split bearers in DC during PDCP data recovery procedure)

[0051] - Encryption and decryption functions (encryption and decryption)

[0052] - Timer-based SDU removal functionality (timer-based SDU discard in uplink)

[0053] Radio Link Control (RLC) 1b-10 and 1b-35 reconfigure the PDCP packet data unit (PDU) to the appropriate size and perform ARQ operations. The main functions of RLC are summarized as follows.

[0054] -Data transmission function (transmission of upper layer PDU)

[0055] -ARQ function (error correction through ARQ (only for AM data transmission))

[0056] - Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU (only for UM and AM data transmission))

[0057] -Re-segmentation function (resegmentation of RLC data PDU (only for AM data transmission))

[0058] - Reordering function (reordering of RLC data PDUs (only for UM and AM data transmission))

[0059] - Duplicate detection function (Duplicate detection (only for UM and AM data transmission))

[0060] - Error detection function (protocol error detection (only for AM data transmission))

[0061] -RLC SDU deletion function (RLC SDU discard (only for UM and AM data transmission))

[0062] -RLC re-establishment function (RLC re-establishment)

[0063] MAC1b-15 and 1b-30 are connected with various RLC layer devices configured in one UE and perform operations for multiplexing RLC PDUs to MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows.

[0064] - Mapping function (mapping between logical channels and transport channels)

[0065] - Multiplexing and demultiplexing functionality (multiplexing / demultiplexing MAC SDUs belonging to one or more different logical channels to / from a transport block (TB), where the transport block is delivered to / from the physical layer on a transport channel)

[0066] -Scheduling information reporting function (Scheduling information reporting)

[0067] -HARQ (Hybrid Automatic Repeat Request) function (error correction through HARQ)

[0068] -Logical channel priority control function (priority processing between logical channels of a UE)

[0069] -UE priority control function (prioritization between UEs with the help of dynamic scheduling)

[0070] -MBMS service identification function (MBMS service identification)

[0071] -Transmission format selection function (Transmission format selection)

[0072] - Fill function (fill)

[0073] The PHY layers 1b-20 and 1b-25 may perform operations for channel coding and modulating higher layer data to generate OFDM symbols and transmit the OFDM symbols through a radio channel, or demodulating and channel decoding OFDM symbols received through a radio channel and transmitting the demodulated and channel-decoded OFDM symbols to a higher layer.

[0074] FIG. 1C is a diagram illustrating a structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0075] 1C, a radio access network of a next generation mobile communication system (hereinafter referred to as NR or 6G) may include a next generation base station 1c-10 (new radio node B, hereinafter referred to as NR gNB or NR base station) and a new radio core network (NR CN) 1c-05. A user terminal 1c-15 (hereinafter referred to as new radio user equipment (NRUE) or terminal) may access an external network through the NR gNB 1c-10 and the NR CN 1c-05.

[0076] In FIG. 1C , NR gNB 1c-10 may correspond to an evolved Node B (eNB) in a conventional LTE system. NR gNB may be connected to NR UE 1c-15 through a radio channel and may provide better services than conventional Node B. Since all user services are served through a shared channel in the next generation mobile communication system, a device for collecting and scheduling status information of the buffer status, available transmission power status, and channel status of the UE is required, and the device corresponds to NR NB 1c-10. One NR gNB may generally control multiple cells. The base station may have a bandwidth wider than the conventional maximum bandwidth in order to achieve ultra-high-speed data transmission compared to conventional LTE, orthogonal frequency division multiplexing (OFDM) may be applied through radio access technology, and beamforming technology may be further applied. In addition, an adaptive modulation and coding (AMC) scheme that determines a modulation scheme and a channel coding rate may be applied depending on the channel state of the NR UE. NR CN 1c-05 may perform functions of supporting mobility, configuring bearers, and configuring QoS. NR CN is a device for performing functions of managing the mobility of NR UE and various control functions, and may be connected to multiple base stations. In addition, the next generation mobile communication system can be linked to the conventional LTE system, and the NR CN can be connected to the MME 1c-25 through a network interface. The MME can be connected to the eNB 1c-30 which is a conventional base station.

[0077] FIG. 1D is a diagram illustrating a radio protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0078] FIG. 1D is a diagram illustrating a radio protocol structure of a next-generation mobile communication system to which the present disclosure can be applied.

[0079] 1D , in the radio protocol of the next generation mobile communication system, the UE and the MR base station may include NRSDAP 1d-01 and 1d-45, NR PDCP 1d-05 and 1d-40, NR RLC 1d-10 and 1d-35, and NR MAC 1d-15 and 1d-30.

[0080] The main functions of NR SDAP 1d-01 and 1d-45 may include some of the following functions.

[0081] -User data transmission function (transmission of user plane data)

[0082] - Functionality for mapping QoS flows and data bearers for uplink and downlink (mapping between QoS flows and DRBs for both DL and UL)

[0083] - Functionality to mark QoS flow ID for uplink and downlink (mark QoS flow ID in both DL and UL packets)

[0084] - Functionality to map Reflective QoS Flow to data bearer for uplink SDAP PDU (Reflective QoS Flow to DRB Mapping for UL SDAPPDU)

[0085] Regarding the SDAP layer device, the UE may receive configuration regarding whether to use the header of the SDAP layer device or the function of the SDAP layer device for each PDCP layer device, each bearer, or each logical channel through an RRC message. If the SDAP header is configured, the 1-bit indicator of NAS reflected QoS and the 1-bit indicator of AS reflected QoS of the SDAP header may indicate that the UE updates or reconfigures information regarding the mapping of QoS flows and data bearers in the uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. QoS information may be used as data processing priority or scheduling information to support seamless services.

[0086] The main functions of NR PDCP 1d-05 and 1d-40 may include some of the following functions.

[0087] - Header compression and decompression function (Header compression and decompression: ROHC only)

[0088] -User data transmission function (transmission of user data)

[0089] - Sequential delivery function (sequential delivery of upper layer PDUs)

[0090] - Out-of-sequence delivery function (out-of-order delivery of upper layer PDUs)

[0091] - Reordering function (for reordering of received PDCP PDUs)

[0092] - Duplicate detection function (duplicate detection of lower layer SDUs)

[0093] -Retransmission function (retransmission of PDCP SDU)

[0094] - Encryption and decryption functions (encryption and decryption)

[0095] - Timer-based SDU removal functionality (timer-based SDU discard in uplink)

[0096] The reordering function of the NR PDCP device is a function of sequentially reordering the PDCP PDUs received by the lower layer based on the PDCP sequence number (SN), and may include a function of sequentially transmitting the reordered data to the higher layer, a function of directly sending the reordered data without considering the sequence, a function of recording the PDCP PDUs lost due to the reordering, a function of reporting the status of the lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of the lost PDCP PDUs.

[0097] The main functions of NR RLC 1d-10 and 1d-35 may include some of the following functions.

[0098] -Data transmission function (transmission of upper layer PDU)

[0099] - Sequential delivery function (sequential delivery of upper layer PDUs)

[0100] - Out-of-sequence delivery function (out-of-order delivery of upper layer PDUs)

[0101] -ARQ function (error correction through ARQ)

[0102] - Concatenation, segmentation and reassembly functions (concatenation, segmentation and reassembly of RLC SDU)

[0103] -Re-segmentation function (resegmentation of RLC data PDU)

[0104] - Reordering function (reordering of RLC data PDUs)

[0105] - Duplicate detection function (duplicate detection)

[0106] - Error detection function (protocol error detection)

[0107] -RLC SDU deletion function (RLC SDU discard)

[0108] -RLC reestablishment function (RLC reestablishment)

[0109] The in-sequence delivery function (in-sequence delivery) of the NR RLC device is a function of sequentially delivering RLC PDUs received from a lower layer to a higher layer, and when one original RLC SDU is divided into a plurality of RLC SDUs and then received, may include a function of reassembling and transmitting the RLC SDU, a function of reordering the received RLC PDU based on the RLC sequence number (SN) or the PDCP SN, a function of recording the RLC PDU lost due to the reordering, a function of reporting the status of the lost RLC PDU to the transmitting side, a function of requesting retransmission of the lost RLC PDU if there is a lost RLC SDU, a function of sequentially delivering only the RLC SDU before the lost RLC SDU to a higher layer if a predetermined timer expires when there is a lost RLC SDU, a function of sequentially delivering all RLC SDUs received before the timer starts (or when the predetermined timer expires when there is a lost RLC SDU) to a higher layer, and a function of sequentially delivering all RLC SDUs received until that point in time to a higher layer. In addition, the NR RLC device can process the RLC PDUs sequentially in the order in which they are received (according to the order of arrival, regardless of the sequence number or order number), and can transmit the RLC PDUs to the PDCP device regardless of their order (out-of-order delivery). In the case of segmentation, the NR RLC device can receive segments stored in the buffer or to be received in the future, reconfigure the segments into one RLC PDU, process the RLC PDU, and then send it to the PDCP device. The NR RLC layer may not include a cascading function, and this function may be performed by the NR MAC layer, or may be replaced by a multiplexing function of the NR MAC layer.

[0110] The out-of-sequence delivery function (out-of-sequence delivery) of the NR RLC device is a function of directly delivering the RLC SDU received from the lower layer to the higher layer regardless of the order of the RLC SDU, and when one original RLC SDU is divided into multiple RLC SDUs and then received, it may include a function of reassembling and sending the RLC PDU, and a function of storing the RLC SN or PDCP SN of the received RLC PDU, reordering the RLC PDU, and recording the lost RLC PDU.

[0111] NR MAC 1d-15 and 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.

[0112] - Mapping function (mapping between logical channels and transport channels)

[0113] -Multiplexing and demultiplexing functions (multiplexing / demultiplexing of MAC SDU)

[0114] -Scheduling information reporting function (Scheduling information reporting)

[0115] -HARQ function (error correction through HARQ)

[0116] -Logical channel priority control function (priority processing between logical channels of a UE)

[0117] -UE priority control function (prioritization between UEs with the help of dynamic scheduling)

[0118] -MBMS service identification function (MBMS service identification)

[0119] -Transmission format selection function (Transmission format selection)

[0120] - Fill function (fill)

[0121] NR PHY layers 1d-20 and 1d-25 perform operations for channel coding and modulating higher layer data to generate OFDM symbols and sending the OFDM symbols through a radio channel, or demodulating and channel decoding OFDM symbols received through a radio channel and sending the demodulated and channel-decoded OFDM symbols to a higher layer.

[0122] FIG. 1E is a diagram illustrating that a UE in an RRC idle mode (RRC_IDLE) or an RRC inactive state (RRC_INACTIVE) performs a cell reselection evaluation procedure in a next generation mobile communication system according to an embodiment of the present disclosure.

[0123] The cell reselection evaluation procedure may indicate a procedure in which a UE in an RRC idle mode (RRC_IDLE) or an RRC inactive state (RRC_INACTIVE) determines whether to maintain the current serving cell or reselect a cell as a neighbor cell when the service quality of the serving cell in which the UE is currently camped becomes lower than the service quality of a neighbor cell due to some reason or mobility.

[0124] In the case of handover, the handover operation is determined by the network (AMF or source gNB), while in the case of cell reselection, the UE in RRC idle mode or RRC inactive state can autonomously determine whether to perform a cell reselection operation based on cell measurement values. The cell reselected by the UE may indicate a cell using the same NR frequency (intra-NR frequency or serving NR frequency) as the serving cell on which the UE is currently camped, a cell using a different NR frequency (inter-NR frequency) from the serving cell, or a cell in a frequency (inter-RAT frequency) using a different radio access technology (hereinafter referred to as RAT).

[0125] Referring to Figure 1E, in 1e-03, UE 1e-01 can establish an RRC connection with NR cell 1e-02 and be in RRC connected mode (RRC_CONNECTED).

[0126] In 1e-04, the NR cell 1e-02 may send an RRC connection release message (RRCRelease) to release the RRC connection with the UE 1e-01 in the RRC connection mode. If the above message includes suspendConfig, the UE may transition to the RRC inactive state (RRC_INACTIVE) in 1e-05. If the above message does not include suspendConfig, the UE may transition to the RRC idle mode (RRC_IDLE) in 1e-05. The above message may include cellReselectionPriorities for the UE to perform cell reselection. The cellReselectionPriorities may include at least one value among freqPriorityListEUTRA, freqPriorityListNR and t320. If the t320 value is included in the cellReselectionPriorities, the UE may use the value to drive the T320 timer. Specifically, the configuration information included in the RRCRelease message may be as shown in Table 0 below.

[0127] [Table 0]

[0128]

[0129]

[0130]

[0131]

[0132]

[0133]

[0134]

[0135]

[0136]

[0137] In step 1e-13, the UE in RRC idle mode or RRC inactive state may obtain basic system information 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.

[0138] In step 1e-15, the UE in RRC idle mode or RRC inactive state can perform a cell selection process based on the basic system information obtained in step 1e-13. That is, the UE is able to find a suitable NR cell belonging to the selected PLMN or SNPN and camp on the cell. The cell on which the UE camps may be referred to as a serving cell. In the present disclosure, based on the 3GPP standard document "38.304: User Equipment (UE) Procedure in Idle Mode and RRC Inactive State", a suitable cell may be defined when the conditions in Table 1 below are met.

[0139] [Table 1]

[0140]

[0141] For reference, if the following Equation 1 is satisfied, the UE may determine that the cell selection criterion is satisfied.

[0142] [Equation 1]

[0143] and

[0144] in

[0145] ,

[0146] .

[0147] For the definition of the parameters used herein, refer to the 3GPP standard document "38.304: User Equipment (UE) Procedures in Idle Mode and RRC Inactive State".

[0148] In step 1e-20, the UE in RRC idle mode or RRC inactive state may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5) including cell reselection information from the serving cell 1e-02 to perform a cell reselection evaluation process. SIB2 may include information / parameters that are generally applied to the UE to reselect intra-NR frequency, inter-NR frequency, and inter-RAT frequency cells, as well as intra-NR frequency cell reselection information that excludes information related to intra-NR frequency neighbor cells. In the example, SIB2 may include one cell reselection priority configuration information for the serving NR frequency (the frequency to which the current camped cell belongs). The cell reselection priority configuration information may mean cellReselectionPriority and cellReselectionSubPriority. Specifically, cellReselectionPriority may include an integer value (e.g., any integer value between 0 and 7), and cellReselectionSubPriority may include a decimal value (e.g., any decimal value between 0.2, 0.4, 0.6, and 0.8). If both cellReselectionPriority and cellReselectionSubPriority are signaled, the UE may add the two values ​​to derive a cell reselection priority value. For reference, a larger cell reselection priority value indicates a higher priority. The serving cell according to the present disclosure is characterized in that the cellReselectionPriority mapped to the serving NR frequency through SIB2 is always (mandatorily) broadcasted, and is characterized in that the cell reselection priority configuration information for the serving NR frequency is always broadcasted, because the cellReselectionSubPriority is optionally broadcasted. Specifically, the cell reselection configuration information broadcast in SIB2 may be as shown in Table 2 below.

[0149] [Table 2]

[0150]

[0151]

[0152]

[0153]

[0154] SIB3 may include neighbor cell information / parameters for UEs in RRC idle mode or RRC inactive state to reselect NR intra-frequency cells. For example, in SIB3, an NR intra-frequency cell list (intraFreqNeighCellList) for reselecting NR intra-frequency cells, or a cell list (intraFreqBlackCellList) for which NR intra-frequency cell reselection is not allowed may be broadcast. Specifically, the information in Table 3 below may be broadcast in SIB3.

[0155] [Table 3]

[0156]

[0157]

[0158] SIB4 may include information / parameters for UEs in RRC idle mode or RRC inactive state to reselect NR inter-frequency cells. For example, one or more NR inter-frequency spaces may be broadcast in SIB4, and one cell reselection priority configuration information per NR inter-frequency space may be broadcast. The cell reselection priority configuration information per NR inter-frequency space indicates the above-mentioned content (e.g., mapped to cellReselectionPriority and / or cellReselectionSubPriority per NR inter-frequency space), but only one cell reselection priority configuration information per frequency space is broadcasted optionally. Specifically, the information in Table 4 below may be broadcast in SIB4.

[0159] [Table 4]

[0160]

[0161]

[0162]

[0163]

[0164] SIB5 may include information / parameters for UEs in RRC idle mode or RRC inactive state to reselect RAT inter-frequency cells. For example, one or more EUTRA frequencies may be broadcast in SIB5, and one cell reselection priority configuration information per EUTRA frequency may be broadcast. The cell reselection priority configuration information per EUTRA frequency indicates the content described above (e.g., mapped to cellReselectionPriority and / or cellReselectionSubPriority per EUTRA frequency), but only one cell reselection priority configuration information per EUTRA frequency is broadcasted optionally. Specifically, the information in Table 5 below may be broadcast in SIB5.

[0165] [Table 5]

[0166]

[0167]

[0168] A UE in an RRC idle mode or an RRC inactive state may perform a cell reselection evaluation procedure (process). The cell reselection evaluation procedure may indicate a series of processes for determining a reselection priority (reselection priority processing), performing frequency measurement by applying a measurement rule for cell reselection, and reselecting a cell by evaluating a cell reselection criterion.

[0169] In step 1e-25, the UE in RRC idle mode or RRC inactive state may determine the reselection priority based on the RRC connection release message received in step 1e-04 or the system information received in step 1e-20. If the RRC connection release message received in step 1e-04 includes cellReselectionPriorities, and if there is no t320 timer value in the cellReselectionPriorities or if the T320 timer value is configured and the T320 timer is running, the UE may determine the reselection priority based on the RRC connection release message. That is, in the case where the celllReselectionPriorities included in the RRC connection release message can be applied, the UE can determine the reselection priority based on the RRC connection release message. If cellReselectionPriorities is not included in the RRC connection release message or cellReselectionPriorities is released, the UE may determine the reselection priority based on the system information received in step 1e-20. Based on the cell reselection priority value mapped to the NR frequency to which the currently camped serving cell belongs, the UE according to the present disclosure is able to determine whether the cell reselection priority for each NR inter-frequency or RAT inter-frequency is equal to, higher than, or lower than the cell reselection priority of the NR frequency to which the serving cell belongs. For example, if the cell reselection priority value mapped to the NR frequency to which the currently camped serving cell belongs in the system information obtained in step 1e-20 is 3, the cell reselection priority value of NR inter-frequency 1 is 2, the cell reselection priority value of NR inter-frequency 2 is 3, the cell reselection priority value of NR inter-frequency 3 is 4, and the cell reselection priority value of EUTRA frequency 1 is 2, then the UE may determine the cell reselection priorities of NR inter-frequency 1 and EUTRA frequency 1 as lower cell reselection priorities, determine the cell reselection priority of NR inter-frequency 2 as equal reselection priorities, and determine the cell reselection priority of NR inter-frequency 3 as higher cell reselection priority.

[0170] In step 1e-30, the UE in RRC idle mode or RRC inactive state may perform frequency measurement for cell reselection. At this time, in order to minimize battery consumption, the UE may perform frequency measurement using the following measurement rules according to the cell reselection priority determined in step 1e-25.

[0171] - If the following condition 1 is met, the UE may not perform NR intra-frequency measurement. Otherwise (e.g., if the following condition 1 is not met), the UE performs NR intra-frequency measurement.

[0172] Condition 1: The reception level (Srxlev) of the serving cell is greater than the SIntraSearchP threshold and the reception quality (Squal) of the serving cell is greater than the SIntraSearchQ threshold (the serving cell satisfies Srxlev>SIntraSearchP and Squal>SIntraSearchQ).

[0173] -For NR inter-frequency or inter-RAT frequency with higher reselection priority than the NR frequency of the current serving cell, the UE may perform measurements according to the 3GPP TS 38.133 standard.

[0174] -For an NR inter-frequency with a reselection priority lower than or equal to the NR frequency of the current serving cell and for an RAT inter-frequency with a reselection priority lower than the NR frequency of the current serving cell, if the following condition 2 is met, the UE may not perform measurement. Otherwise (for example, if the following condition 2 is not met), the UE measures the cell in the NR inter-frequency with a reselection priority lower than or equal to the NR frequency, or measures the cell in the RAT inter-frequency with a reselection priority lower than the NR frequency.

[0175] Condition 2: The reception level (Srxlev) of the serving cell is greater than the SnonIntraSearchP threshold and the reception quality (Squal) of the serving cell is greater than the SnonIntraSearchQ threshold (the serving cell satisfies Srxlev>SnonIntraSearchP and Squal>SnonIntraSearchQ).

[0176] For reference, the above mentioned thresholds (SintraSearchP, SintraSearchQ, SnonIntraSearchP, SnonintraSearchQ) may be broadcasted in the system information obtained in step 1e-20.

[0177] In step 1e-35, the UE in RRC idle mode or RRC inactive state may decide to reselect a cell that meets the cell reselection criteria based on the measurement values ​​performed in step 1e-30. Different cell reselection criteria may be applied depending on the cell reselection priority. If multiple cells of different priorities meet the cell reselection criteria, cell reselection to a higher priority RAT / frequency shall take precedence over a lower priority RAT / frequency. Specifically, the operation of the UE with respect to the reselection criteria for an inter-frequency / inter-RAT cell having a higher priority than the frequency of the current serving cell is as follows.

[0178] -First operation:

[0179] ■ If SIB2 is broadcast with a threshold of threshServingLowQ and one second has elapsed since the UE camped on the current serving cell, and if the signal quality (Squal) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighQ during the time interval TreselectionRAT, the UE performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0180] - Second operation:

[0181] ■ If the UE fails to perform the first operation, it performs the second operation.

[0182] ■ If one second has elapsed since the UE camped on the current serving cell and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighP during the time interval TreselectionRAT, the UE performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0183] When performing the first or second operation, the UE uses the values ​​of signal quality (Squal), reception level (Srxlev), threshold (ThreshX, HighQ, ThreshX, HighP) and TreselectionRAT for the inter-frequency cell based on the information included in SIB4 broadcasted from the serving cell, and uses the values ​​of signal quality (Squal), reception level (Srxlev), threshold (ThreshX, HighQ, ThreshX, HighP) and TreselectionRAT for the inter-RAT cell based on the information included in SIB5 broadcasted from the serving cell. For example, SIB4 includes a Qqualmin value or a Qrxlevmin value, and based on this, the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell is derived. If there are multiple cells that meet the high cell reselection priority in the NR frequency, the UE can reselect the highest ranked cell among the cells that meet the reselection criteria of the intra-frequency / inter-frequency cell with the same priority as the frequency of the current serving cell as described below.

[0184] In addition, the operation of the UE with respect to the reselection criteria of the intra-frequency / inter-frequency cell having the same priority as the frequency of the current serving cell is as follows.

[0185] -Third operation:

[0186] ■If the signal quality (Squal) and reception level (Srxlev) of the intra-frequency / inter-frequency cell are greater than 0, the UE derives the ranking of each cell based on the measurement value (RSRP). That is, the UE shall perform the ranking of all cells that meet the cell selection criterion S. The ranking of the serving cell and the neighbor cell is each calculated using the following equation 2.

[0187] [Equation 2]

[0188]

[0189]

[0190] ●Here, Qmeas,s is the RSRP measurement value of the serving cell, Qmeas,n is the RSRP measurement value of the neighbor cell, Qhyst is the hysteresis value of the serving cell, and Qoffset is the offset between the serving cell and the neighbor cell. SIB2 includes the Qhyst value, which is typically used for intra-frequency / inter-frequency cell reselection. In the case of intra-frequency cell reselection, Qoffset is signaled for each cell, applies only to the indicated cells, and is included in SIB3. In the case of inter-frequency cell reselection, Qoffset is signaled for each cell, applies only to the indicated cells, and is included in SIB4. If any neighbor cell has a ranking greater than the ranking of the serving cell (Rn>Rs) obtained from equation 2 above, it is reselected as the best cell among the neighbor cells.

[0191] ● Here, Qoffset-temp- is an offset temporarily applied to the cell and may indicate connEstFailOffset included in ConnEstFailureControld broadcasted in SIB1. It may be applied when the RRC connection fails (eg, when the T300 timer expires).

[0192] In addition, the operation of the UE with respect to the reselection criteria of the inter-frequency / inter-RAT cell having a lower priority than the frequency of the current serving cell is as follows.

[0193] -Fourth operation:

[0194] ■If SIB2 is broadcast with a threshold of threshServingLowQ and one second has elapsed since the UE camped on the current serving cell, and if the signal quality (Sqaul) of the current serving cell is less than the threshold ThreshServing,LowQ and the signal quality (Squal) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,LowQ during the time interval TreselectionRAT, the UE performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0195] -Fifth Operation:

[0196] ■ If the UE fails to perform the fourth operation, it performs the fifth operation.

[0197] ■If one second has elapsed since the UE camped on the current serving cell, the reception level (Srxlev) of the current serving cell is less than the threshold ThreshServing,LowP, and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,LowP during the time interval TreselectionRAT, the UE performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0198] Here, the UE's fourth or fifth operation for the inter-frequency cell is performed based on the threshold value (ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcasted from the serving cell and based on the signal quality (Squal), reception level (Srxlev), threshold value (ThreshX, LowQ, ThreshX, LowP) and TreselectionRAT for the inter-frequency cell included in SIB4 broadcasted from the serving cell, and the UE's fourth or fifth operation for the inter-RAT cell is performed based on the threshold value (ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcasted from the serving cell and based on the signal quality (Squal), reception level (Srxlev), threshold value (ThreshX, LowQ, ThreshX, LowP) and TreselectionRAT for the inter-RAT cell included in SIB5 broadcasted from the serving cell. For example, SIB4 includes a Qqualmin value or a Qrxlevmin value, and based on this, the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell is derived. If there are multiple cells satisfying a high cell reselection priority in the NR frequency, the UE may reselect the highest ranked cell among the cells satisfying the reselection criteria for the intra-frequency / inter-frequency cell having the same priority as the frequency of the current serving cell as described below.

[0199] In step 1e-40, the UE in the RRC idle mode or RRC inactive state receives system information (e.g., MIB or SIB1) broadcasted from the candidate target cell before finally reselecting the candidate target cell, and determines whether the reception level (Srxlev) and reception quality (Squal) of the candidate target cell meet the cell selection criterion (Srxlev>0 and Squal>0) called the S criterion (Equation 1) based on the received system information. If Equation 1 is satisfied and the candidate target cell is suitable, the UE can reselect the candidate target cell.

[0200] Figure 1G is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a typical NR mobile communication system according to an embodiment of the present disclosure.

[0201] In a typical NR system according to this embodiment, the UE determines the mobility state in RRC idle mode or RRC inactive mode and reports it to the NR base station.

[0202] 1F , UE 1g-01 may be in an RRC idle mode (RRC_IDLE) or an RRC inactive mode (RRC_INACTIVE).

[0203] In step 1g-10, the UE 1g-01 in RRC idle mode or RRC inactive mode may receive or obtain system information from the base station 1g-02. The system information may include parameters for the UE to perform a cell selection or cell reselection process. This may follow the above-described embodiment. In addition, the base station 1g-02 may broadcast system information including a parameter (SpeedStateSelectionPars) for determining the mobility state of the UE.

[0204] -t-Evaluation: Duration to evaluate the criteria to enter the mobility state. For example, one of the values ​​such as 30 seconds, 60 seconds, 120 seconds, 180 seconds, or 240 seconds may be signaled.

[0205] ■t-Evaluation can indicate T CRmax , and this specifies the duration used to evaluate the amount of cell reselection(s) allowed.

[0206] -t-HystNormal: Additional duration for evaluating criteria to enter normal mobility state. For example, one of the values ​​such as 30 seconds, 60 seconds, 120 seconds, 180 seconds or 240 seconds may be signaled.

[0207] ■t-HystNormal can indicate T CRmaxHyst , and this specifies an additional time period before the UE can enter the normal mobility state.

[0208] -n-CellChangeMedium: The number of cell changes to enter the medium mobility state. For example, one of the integer values ​​from 1 to 16 may be signaled.

[0209] ■n-CellChangeMedium can indicate N CR_M , and this specifies the maximum number of cell reselections to enter the medium mobility state.

[0210] - n-CellChangeHigh: The number of cell changes to enter a high mobility state. For example, one of the integer values ​​from 1 to 16 may be signaled, and a value greater than n-CellChangeMedium may be signaled.

[0211] ■n-CellChangeHigh can indicate N CR_H , and this specifies the maximum number of cell reselections to enter the high mobility state.

[0212] -q-HystSF: Speed-based ScalingFactor parameter

[0213] ■sf-Medium: Additional hysteresis parameter value used in medium mobility state. For example, a value among -6dB, -4dB, -2dB and 0dB may be signaled.

[0214] ■sf-High: Additional hysteresis parameter value used in high mobility state. For example, a value of -6dB, -4dB, -2dB and 0dB may be signaled.

[0215] -t-Reselection-SF (per NR frequency): SpeedStateScaleFactors parameter

[0216] ■sf-Medium: Additional mobility control related parameter value used in medium mobility state. For example, a value among 0.25, 0.5, 0.75 and 1 may be signaled.

[0217] ■sf-High: Additional mobility control related parameter value used in high mobility state. For example, a value of 0.25, 0.5, 0.75 and 1 may be signaled.

[0218] -t-ReselectionEUTRA-SF (per EUTRA frequency or common to all EUTRA frequencies): SpeedStateScaleFactors parameter

[0219] ■sf-Medium: Additional mobility control related parameter value used in medium mobility state. For example, a value of 0.25, 0.5, 0.75 and 1 may be signaled.

[0220] ■sf-High: Additional mobility control related parameter value used in high mobility state. For example, a value of 0.25, 0.5, 0.75 and 1 may be signaled.

[0221] In step 1g-15, UE 1g-01 in RRC idle mode or RRC inactive mode may perform a cell selection or cell reselection procedure. This may follow the above-described embodiment.

[0222] In step 1g-20, the UE 1g-01 in the RRC idle mode or the RRC inactive mode may determine the mobility state. The UE may determine the mobility state based on the following predetermined criteria.

[0223] -Medium mobility status standard

[0224] ■If in time period T CRmax The number of cell reselections during the period is greater than or equal to N CR_M But less than or equal to N CR_H

[0225] - High mobility status standard

[0226] ■If in time period T CRmax The number of cell reselections during this period is greater than N CR_H

[0227] -Normal mobility status standard

[0228] ■If in time period T CRmaxHsyt The criteria for medium or high mobility states are not detected during the period, or if during the period T CRmax The number of cell reselections during this period is less than N CR_M

[0229] The UE may perform a cell reselection procedure by applying a scaling rule according to the determined mobility state. Specifically,

[0230] - If neither medium mobility state nor high mobility state is detected,

[0231] ■Do not apply scaling.

[0232] - If a high mobility state is detected,

[0233] ■ If broadcasted in the system information, add sf-High of "Speed-dependent ScalingFactor for Qhyst" to Qhyst.

[0234] ■For NR cells, if broadcasted in the system information, TreselectionNR is multiplied by sf-High of “Speed-dependent ScalingFactor for TreselectionNR”.

[0235] ■ For EUTRA cells, if broadcasted in the system information, TreselectionEUTRA is multiplied by sf-High of "Speed-dependent ScalingFactor for TreselectionNR".

[0236] - If a medium mobility state is detected,

[0237] ■ Add sf-Medium of "Speed-dependent ScalingFactor for Qhyst" to Qhyst if broadcasted in system information.

[0238] ■For NR cells, if broadcasted in the system information, TreselectionNR is multiplied by sf-Medium of “Speed-dependent ScalingFactor for TreselectionNR”.

[0239] ■ For EUTRA cells, if broadcasted in the system information, TreselectionEUTRA is multiplied by sf-Medium of the "Speed-dependent ScalingFactor for TreselectionNR".

[0240] For reference, in case scaling is applied to any TreselectionRAT parameter, the UE shall round up the result to the nearest second after all scaling.

[0241] In step 1g-20, the UE may perform the cell reselection procedure specified in step 1g-15 by reflecting the scaling result according to the determined mobility state.

[0242] In step 1g-25, UE 1g-01 in RRC idle mode or RRC inactive mode may initiate an RRC connection establishment process or an RRC connection recovery process to establish an RRC connection with base station 1g-02. That is, in step 1g-25, the UE may send an RRC connection request message (RRCSetupRequest) or an RRC connection recovery request message (RRCResumeRequest or RRCResumeRequest1) to the base station. In step 1g-30, the base station may send an RRC connection establishment message (RRCSetup) or an RRC connection recovery message (RRCResume) to the UE in response to the RRC connection request message or the RRC connection recovery request message. In step 1g-31, the UE that has received the RRC connection establishment message or the RRC connection recovery message may transition to RRC connection mode (RRC_CONNECTED). Then, in step 1g-35, the UE in RRC connection mode may send an RRC connection establishment completion message (RRCSetupComplete) or an RRC connection recovery completion message (RRCResumeComplete) to the base station. At this time, the RRC connection establishment complete message or the RRC connection recovery complete message may include the mobility state of the UE. Specifically, the RRC connection establishment complete message or the RRC connection recovery complete message may include mobilityState and set it to the mobility state of the UE just before entering the RRC_CONNECTED state (as specified in TS38.304).

[0243] Figure 1H is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0244] The UE in the next generation mobile communication system according to this embodiment may mean a UE capable of receiving unmanned aerial vehicle (UAV) services. Alternatively, the UE in the next generation mobile communication system according to this embodiment may mean a UE capable of flying or moving at high speed or a UE capable of applying a newly defined mobility state determination method. The UE capable of receiving UAV services may meet the following requirements specified in 3GPP TS 22.125. In particular, the UE is capable of receiving UAV services while moving at high speed. In the case of conforming to the typical mobility state determination, a UE moving at high speed may enter a medium mobility state or a high mobility state much later despite its high speed.

[0245] For example, if the entry criteria for a UE moving at a high speed and a UE moving at a low speed to enter a medium or high mobility state are based on the same number of cell reselections, the UE moving at a high speed may enter the medium mobility state or the high mobility state at the same time as the UE moving at a low speed even if it has a higher speed than the UE moving at a low speed.

[0246] Accordingly, in this embodiment, a method for determining the mobility state of the above UE is proposed.

[0247]

[0248] Referring to Figure 1H, in step 1h-03, UE 1h-01 can establish an RRC connection with the NR cell 1h-02 and is therefore in RRC connected mode (RRC_CONNECTED).

[0249] In step 1h-04, the UE 1h-01 in RRC connected mode may send a UE capability information message (UECapabilityInformation) to the NR cell 1h-02. The message may include at least one of the following items.

[0250] - Indicators to support enhanced mobility state determination

[0251] - Indicator indicating UAV UE

[0252] -Indicator indicating that new speed dependent reselection parameters included in system information or RRC connection release message can be applied

[0253] In step 1h-05, the NR cell 1h-02 may send an RRC connection release message (RRCRelease) to the UE 1h-01 in RRC connection mode. The message may include a new speed dependent reselection parameter. The new speed dependent reselection parameter may indicate at least one of the following items.

[0254] -t-ReselectionRATUAV: This specifies the cell reselection timer value. The value of a specific cell reselection timer can be defined for each target NR frequency or for each RAT. A typical t-ReselectionRAT can be set to one of 0, 1...7, but t-ReselectionRATUAV can be set to a value less than the typical t-ReselectionRAT or to one of various smaller values. For example, t-ReselectionRATUAV can be set to one of 0, 0.1, 0.2, 0.3, 0.4...1.

[0255] ■The timer value of NR indicates t-ReselectionNRUAV, and the timer value can be configured for each frequency.

[0256] ■ The timer value for E-UTRA indicates t-ReselectionEUTRAUAV, and the timer value can be configured to be applied to each UTRA frequency or to be configured to be commonly applied to E-UTRA frequencies.

[0257] ■Because t-ReselectionRAT can be set to a value less than a typical t-ReselectionRAT or to various smaller values, the UE of the present disclosure can perform cell reselection faster. For example, when t-ReselectionRAT is set to a value among 0, 0.1, 0.2, 0.3, 0.4...1, the UE of the present disclosure moving at a high speed has a lower cell reselection timer value than the cell reselection timer value of a typical normal UE moving at a low speed, and thus it can enter a medium mobility state or a high mobility state faster than a typical normal UE moving at a low speed.

[0258] -t-EvaluationUAV: Duration of evaluation criteria to enter a mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 20 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, or 240 seconds may be signaled. This parameter may include a value that is less than the typical t-Evaluation value. This is to enable a UE according to the present disclosure to enter a medium mobility state or a high mobility state more quickly.

[0259] ■t-EvaluationUAV can indicate T CRmaxUAV , and this specifies the duration for evaluating the amount of allowed cell selection(s).

[0260] -t-HystNormalUAV: Additional duration for evaluating criteria to enter the Normal mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, 240 seconds, or 360 seconds may be signaled. This parameter may include values ​​that are smaller or larger than the typical t-HystNormal. The reason for including a small value is that the UE transitions to the Normal mobility state quickly, and the reason for including a large value is that the UE transitions to the Normal mobility state slowly.

[0261] ■t-HystNormalUAV can indicate T CRmaxHystUAV , and this specifies an additional time period before the UE can enter the normal mobility state.

[0262] -n-CellChangeMediumUAV: The number of cell changes to enter the medium mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled. This parameter may include a value that is smaller than the value of the typical n-CellChangeMedium. This is to enable a UE according to the present disclosure to enter the medium mobility state more quickly.

[0263] ■n-CellChangeMediumUAV can indicate N CR_MUAV , and this specifies the maximum number of cell reselections to enter the medium mobility state.

[0264] -n-CellChangeHighUAV: The number of cell changes to enter a high mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled, and a value greater than the value of n-CellChangeMediumUAV may be signaled. This parameter may include a value less than the typical n-CellChangeHigh. This is to enable a UE according to the present disclosure to enter a high mobility state more quickly.

[0265] ■n-CellChangeHigh can indicate N CR_H , and this specifies the maximum number of cell reselections to enter the high mobility state.

[0266] -q-HystSFUAV: Speed-based ScalingFactor parameter

[0267] ■sf-MediumUAV: Additional hysteresis parameter value used in medium mobility state. For example, a value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​smaller than the typical sf-Medium value, and this is intended to facilitate UE reselection of neighbor cells.

[0268] ■sf-HighUAV: Additional hysteresis parameter value used in high mobility state. A value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​less than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0269] -t-Reselection-SFUAV (per NR frequency): SpeedStateScaleFactors parameter

[0270] ■ sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​smaller than the typical sf-Medium value and this is intended to facilitate UE reselection of neighbor cells.

[0271] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0272] -t-ReselectionEUTRA-SFUAV (per EUTRA frequency or common to all EUTRA frequencies): SpeedStateScaleFactors parameter

[0273] ■sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-Medium value, and this is intended to facilitate reselection of neighbor cells.

[0274] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.25, 0.5, 0.75 and 1 may be signaled. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value, and this is intended to facilitate UE reselection of neighbor cells.

[0275] - A value indicating how many seconds after the UE camps on a serving cell a cell reselection is possible.

[0276] ■ Typically, reselection to a neighbor cell is possible after one second has elapsed since the UE camped on the current serving cell, but the new value includes a value less than one second, enabling a UE according to the present disclosure to reselect a neighbor cell faster than one second.

[0277] - New timer value

[0278] ■ The new timer value indicates the time to apply the new speed dependent reselection parameters described above. If the new timer value is included, the UE according to the present disclosure can drive a new timer with the new timer value.

[0279] In step 1h-06, the UE 1h-01 receiving the RRC connection release message may transition to an RRC idle mode (RRC_IDLE) or an RRC inactive mode (RRC_INACTIVE).

[0280] In step 1h-10, the UE 1h-01 in RRC idle mode or RRC inactive mode may receive or obtain system information from the base station 1h-02. The system information may include parameters for the UE to perform a cell selection or cell reselection process. This may follow the above-described embodiment. In addition, the base station 1h-02 may broadcast system information including a new parameter (SpeedStateSelectionParSUAV) for determining the mobility state of the UE.

[0281] -t-ReselectionRATUAV: This specifies the cell reselection timer value. The value of a specific cell reselection timer can be defined for each target NR frequency or for each RAT. Typical t-ReselectionRAT can be set to one of 0, 1...7, but t-ReselectionRATUAV can be set to a value less than the typical t-ReselectionRAT or to one of various smaller values. For example, it can be set to one of 0, 0.1, 0.2, 0.3, 0.4...1.

[0282] ■The timer value of NR indicates t-ReselectionNRUAV, and the timer value can be configured for each frequency.

[0283] ■ The timer value for E-UTRA indicates t-ReselectionEUTRAUAV, and the timer value can be configured to be applied to each UTRA frequency or to be configured to be commonly applied to E-UTRA frequencies.

[0284] ■ Because it can be set to a value smaller than a typical t-ReselectionRAT or to various smaller values, the UE of the present disclosure can perform cell reselection faster.

[0285] -t-EvaluationUAV: Duration of evaluation criteria to enter a mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 20 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, or 240 seconds may be signaled. This parameter may include a value that is less than the typical t-Evaluation value. This is to enable a UE according to the present disclosure to enter a medium mobility state or a high mobility state more quickly.

[0286] ■t-EvaluationUAV can indicate T CRmaxUAV, and this specifies the duration for evaluating the amount of allowed cell selection(s).

[0287] -t-HystNormalUAV: Additional duration for evaluating criteria to enter the Normal mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, 240 seconds, or 360 seconds may be signaled. This parameter may include values ​​that are smaller or larger than the typical t-HystNormal. The reason for including a small value is that the UE transitions to the Normal mobility state quickly, and the reason for including a large value is that the UE transitions to the Normal mobility state slowly.

[0288] ■t-HystNormalUAV can indicate T CRmaxHystUAV , and this specifies an additional time period before the UE can enter the normal mobility state.

[0289] -n-CellChangeMediumUAV: The number of cell changes to enter the medium mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled. This parameter may include a value that is smaller than the value of the typical n-CellChangeMedium. This is to enable a UE according to the present disclosure to enter the medium mobility state more quickly.

[0290] ■n-CellChangeMediumUAV can indicate N CR_MUAV , and this specifies the maximum number of cell reselections to enter the medium mobility state.

[0291] -n-CellChangeHighUAV: The number of cell changes to enter a high mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled, and a value greater than the value of n-CellChangeMediumUAV may be signaled. This parameter may include a value less than the typical n-CellChangeHigh. This is to enable a UE according to the present disclosure to enter a high mobility state more quickly.

[0292] ■n-CellChangeHigh can indicate N CR_H , and this specifies the maximum number of cell reselections to enter the high mobility state.

[0293] -q-HystSFUAV: Speed-based ScalingFactor parameter

[0294] ■sf-MediumUAV: Additional hysteresis parameter value used in medium mobility state. For example, a value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​smaller than the typical sf-Medium value, and this is intended to facilitate UE reselection of neighbor cells.

[0295] ■sf-HighUAV: Additional hysteresis parameter value used in high mobility state. A value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​less than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0296] -t-Reselection-SFUAV (per NR frequency): SpeedStateScaleFactors parameter

[0297] ■sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, a value of 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-Medium value, and this is intended to facilitate UE reselection of neighbor cells.

[0298] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0299] -t-ReselectionEUTRA-SFUAV (per EUTRA frequency or common to all EUTRA frequencies): SpeedStateScaleFactors parameter

[0300] ■sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, one of 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-Medium value, and this is intended to facilitate reselection of neighbor cells.

[0301] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.25, 0.5, 0.75 and 1 may be signaled. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value, and this is intended to facilitate UE reselection of neighbor cells.

[0302] - A value indicating how many seconds after the UE camps on a serving cell a cell reselection is possible.

[0303] ■ Typically, reselection to a neighbor cell is possible after one second has elapsed since the UE camped on the current serving cell, but the new value includes a value less than one second, enabling a UE according to the present disclosure to reselect a neighbor cell faster than one second.

[0304] In step 1h-15, the UE 1h-01 in RRC idle mode or RRC inactive mode may perform a cell selection or cell reselection procedure. This can be performed by following the above embodiment or by applying at least one of the parameters described in step 1h-10 above.

[0305] In step 1h-20, the UE 1h-01 in RRC idle mode or RRC inactive mode may determine the mobility state. In the case where the UAV-supporting UE acquires the new speed-dependent reselection parameter in step 1h-05 or step 1h-10, it may determine the mobility state according to a predetermined criterion based on the new speed-dependent reselection parameter. For reference, if the new speed-dependent reselection parameter is configured in step 1h-05, the UE may apply the new speed-dependent reselection parameter included in the RRC connection release message.

[0306] -Medium mobility status standard

[0307] ■If in time period T CRmax (or T CRmaxUAV ) The number of cell reselections during the period is greater than or equal to N CR_M (or N CR_MUAV ) but less than or equal to N CR_H (or N CR_H-UAV )

[0308] - High mobility status standard

[0309] ■If in time period T CRmax (or T CRmaxUAV ) The number of cell reselections during the period is greater than N CR_H (or N CR_H-UAV )

[0310] -Normal mobility status standard

[0311] ■If in time period T CRmaxHystUAV or T CRmaxHyst The criteria for medium or high mobility states are not detected during the period, or if during the period T CRmaxUAV (or TCRmax ) The number of cell reselections during this period is less than N CR_M (or N CR_MUAV )

[0312] The UE may perform a cell reselection procedure by applying a scaling rule according to the determined mobility state. Specifically,

[0313] - If neither medium mobility state nor high mobility state is detected,

[0314] ■Do not apply scaling.

[0315] - If a high mobility state is detected,

[0316] ■ Add sf-HighUAV (or sf-High) for “Speed-dependent ScalingFactor for Qhyst” to Qhyst if broadcasted in system information.

[0317] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-HighUAV (or sf-High) of “Speed-dependent Scalingfactor for TreselectionNRuav (or TreselectionNR)”.

[0318] ■ For EUTRA cells, if broadcasted in the system information, multiply TreselectionEUTRAUAV (or TreselectionEUTRA) by sf-HighUAV (or sf-High) of the “Speed-dependent ScalingFactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0319] - If a medium mobility state is detected,

[0320] ■ Add sf-MediumUAV (or sf-Medium) for "Speed-dependent ScalingFactor for Qhyst" to Qhyst if broadcasted in system information.

[0321] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-MediumUAV (or sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionNRuav (or TreselectionNR)”.

[0322] ■ For EUTRA cells, if broadcasted in the system information, multiply TreselectionEUTRAUAV (or TreselectionETURA) by sf-MediumUAV (sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0323] For reference, in case scaling is applied to any TreselectionRAT parameter, the UE shall round up the result to the nearest second after all scaling.

[0324] For reference, if the UAV-capable UE or the UAV-non-capable UE fails to acquire new speed-dependent reselection parameters in step 1h-05 or step 1h-10, it may determine the mobility state based on the above-mentioned embodiment.

[0325] In step 1h-20, the UE may perform the cell reselection procedure specified in step 1h-15 by reflecting the scaling result according to the determined mobility state.

[0326] In step 1h-25, UE 1h-01 in RRC idle mode or RRC inactive mode may initiate an RRC connection establishment process or an RRC connection recovery process to establish an RRC connection with base station 1h-02. That is, in step 1h-25, the UE may send an RRC connection request message (RRCSetupRequest) or an RRC connection recovery request message (RRCResumeRequest or RRCResumeRequest1) to the base station. In step 1h-30, the base station may send an RRC connection establishment message (RRCSetup) or an RRC connection recovery message (RRCResume) to the UE in response to the RRC connection request message or the RRC connection recovery request message. In step 1h-31, the UE that has received the RRC connection establishment message or the RRC connection recovery message may switch to RRC connection mode (RRC_CONNECTED). Then, in step 1h-35, the UE in RRC connection mode may send an RRC connection establishment completion message (RRCSetupComplete) or an RRC connection recovery completion message (RRCResumeComplete) to the base station. At this time, the RRC connection establishment complete message or the RRC connection recovery complete message may include the new mobility state of the UE (mobility state of the UAV) or the typical mobility state. Specifically, the RRC connection establishment complete message or the RRC connection recovery complete message may include mobilityStateUAV or mobilityState and set it to the mobility state of the UE just before entering the RRC_CONNECTED state (as specified in TS 38.304).

[0327] According to the present disclosure, in the case of a UAV UE, if a new speed-dependent reselection parameter is broadcast or configured, the UAV UE can determine the mobility state or perform cell reselection by applying the new speed-dependent reselection parameter. Even in the case of a UAV UE, if it does not have a new speed-dependent reselection parameter, it can determine the mobility state or perform cell reselection according to a typical method.

[0328] Figure 1I is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0329] The UE in the next generation mobile communication system according to this embodiment may mean a UE capable of receiving unmanned aerial vehicle (UAV) services. Alternatively, the UE in the next generation mobile communication system according to this embodiment may mean a UE capable of flying or moving at high speed or a UE capable of applying a newly defined mobility state determination method. The UE capable of receiving UAV services may meet the following requirements specified in 3GPP TS 22.125. In particular, the UE is capable of receiving UAV services while moving at high speed. In the case of typical mobility state determination, a UE moving at high speed may enter a medium mobility state or a high mobility state much later despite its high speed. Accordingly, in this embodiment, a mobility state determination method for the above-mentioned UE is proposed.

[0330]

[0331] Referring to Figure 1I, in step 1i-03, UE 1i-01 can establish an RRC connection with the NR cell 1i-02 and is therefore in an RRC connected mode (RRC_CONNECTED).

[0332] In step 1i-04, UE 1i-01 in RRC connected mode may send a UE capability information message (UECapabilityInformation) to NR cell 1i-02. The message may include at least one of the following items.

[0333] - Indicators to support enhanced mobility state determination

[0334] - Indicator indicating UAV UE

[0335] -Indicator indicating that new speed dependent reselection parameters included in system information or RRC connection release message can be applied

[0336] -Indicator indicating that the enhanced mobility state can be determined based on speed

[0337] In step 1i-05, the NR cell 1i-02 may send an RRC connection release message (RRCRelease) to the UE 1i-01 in RRC connection mode. The message may include a new speed dependent reselection parameter. The new speed dependent reselection parameter may indicate at least one of the following items.

[0338] -t-ReselectionRATUAV: This specifies the cell reselection timer value. The value of a specific cell reselection timer can be defined for each target NR frequency or for each RAT. A typical t-ReselectionRAT can be set to one of 0, 1...7, but t-ReselectionRATUAV can be set to a value less than the typical t-ReselectionRAT or to one of various smaller values. For example, t-ReselectionRATUAV can be set to one of 0, 0.1, 0.2, 0.3, 0.4...1.

[0339] ■The timer value of NR indicates t-ReselectionNRUAV, and the timer value can be configured for each frequency.

[0340] ■ The timer value for E-UTRA indicates t-ReselectionEUTRAUAV, and the timer value can be configured to be applied to each UTRA frequency or to be configured to be commonly applied to E-UTRA frequencies.

[0341] ■Because t-ReselectionRAT can be set to a value less than a typical t-ReselectionRAT or to various smaller values, the UE of the present disclosure can perform cell reselection faster. For example, when t-ReselectionRAT is set to a value among 0, 0.1, 0.2, 0.3, 0.4...1, the UE of the present disclosure moving at a high speed has a lower cell reselection timer value than the cell reselection timer value of a typical normal UE moving at a low speed, and thus it can enter a medium mobility state or a high mobility state faster than a typical normal UE moving at a low speed.

[0342] -t-EvaluationUAV: Duration of evaluation criteria to enter a mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 20 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, or 240 seconds may be signaled. This parameter may include a value that is less than the typical t-Evaluation value. This is to enable a UE according to the present disclosure to enter a medium mobility state or a high mobility state more quickly.

[0343] ■t-EvaluationUAV can indicate T CRmaxUAV , and this specifies the duration for evaluating the amount of allowed cell selection(s).

[0344] -t-HystNormalUAV: Additional duration for evaluating criteria to enter the Normal mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, 240 seconds, or 360 seconds may be signaled. This parameter may include values ​​that are smaller or larger than the typical t-HystNormal. The reason for including a small value is that the UE transitions to the Normal mobility state quickly, and the reason for including a large value is that the UE transitions to the Normal mobility state slowly.

[0345] ■t-HystNormalUAV can indicate T CRmaxHystUAV , and this specifies an additional time period before the UE can enter the normal mobility state.

[0346] -n-CellChangeMediumUAV: The number of cell changes to enter the medium mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled. This parameter may include a value that is smaller than the value of the typical n-CellChangeMedium. This is to enable a UE according to the present disclosure to enter the medium mobility state more quickly.

[0347] ■n-CellChangeMediumUAV can indicate N CR_MUAV , and this specifies the maximum number of cell reselections to enter the medium mobility state.

[0348] -n-CellChangeHighUAV: The number of cell changes to enter a high mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled, and a value greater than the value of n-CellChangeMediumUAV may be signaled. This parameter may include a value less than the typical n-CellChangeHigh. This is to enable a UE according to the present disclosure to enter a high mobility state more quickly.

[0349] ■n-CellChangeHigh can indicate N CR_H , and this specifies the maximum number of cell reselections to enter the high mobility state.

[0350] -q-HystSFUAV: Speed-based ScalingFactor parameter

[0351] ■sf-MediumUAV: Additional hysteresis parameter value used in medium mobility state. For example, a value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​smaller than the typical sf-Medium value, and this is intended to facilitate UE reselection of neighbor cells.

[0352] ■sf-HighUAV: Additional hysteresis parameter value used in high mobility state. A value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​less than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0353] -t-Reselection-SFUAV (per NR frequency): SpeedStateScaleFactors parameter

[0354] ■sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, a value of 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-Medium value, and this is intended to facilitate UE reselection of neighbor cells.

[0355] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0356] -t-ReselectionEUTRA-SFUAV (per EUTRA frequency or common to all EUTRA frequencies): SpeedStateScaleFactors parameter

[0357] ■sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-Medium value, and this is intended to facilitate reselection of neighbor cells.

[0358] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.25, 0.5, 0.75 and 1 may be signaled. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value, and this is intended to facilitate UE reselection of neighbor cells.

[0359] - A value indicating how many seconds after the UE camps on a serving cell a cell reselection is possible.

[0360] ■ Typically, reselection to a neighbor cell is possible after one second has elapsed since the UE camped on the current serving cell, but the new value includes a value less than one second, enabling a UE according to the present disclosure to reselect a neighbor cell faster than one second.

[0361] - New timer value

[0362] ■ The new timer value indicates the time to apply the new speed dependent reselection parameters described above. If the new timer value is included, the UE according to the present disclosure can drive a new timer with the new timer value.

[0363] - Speed ​​threshold

[0364] ■ If the UE's speed is greater than the speed threshold, new speed dependent reselection parameters may be applied. Otherwise, typical speed dependent reselection parameters may be applied.

[0365] In step 1i-06, the UE 1i-01 receiving the RRC connection release message may transition to an RRC idle mode (RRC_IDLE) or an RRC inactive mode (RRC_INACTIVE).

[0366] In step 1i-10, UE 1i-01 in RRC idle mode or RRC inactive mode may receive or obtain system information from base station 1i-02. The system information may include parameters for the UE to perform a cell selection or cell reselection procedure. This may follow the above-described embodiments. In addition, base station 1i-02 may broadcast system information including a new parameter (SpeedStateSelectionParSUAV) for determining the mobility state of the UE.

[0367] -t-ReselectionRATUAV: This specifies the cell reselection timer value. The value of a specific cell reselection timer can be defined for each target NR frequency or for each RAT. A typical t-ReselectionRAT can be set to one of 0, 1...7, but t-ReselectionRATUAV can be set to a value less than the typical t-ReselectionRAT or to one of various smaller values. For example, t-ReselectionRATUAV can be set to one of 0, 0.1, 0.2, 0.3, 0.4...1.

[0368] ■The timer value of NR indicates t-ReselectionNRUAV, and the timer value can be configured for each frequency.

[0369] ■ The timer value for E-UTRA indicates t-ReselectionEUTRAUAV, and the timer value can be configured to be applied to each UTRA frequency or to be configured to be commonly applied to E-UTRA frequencies.

[0370] ■Because t-ReselectionRAT can be set to a value less than a typical t-ReselectionRAT or to various smaller values, the UE of the present disclosure can perform cell reselection faster. For example, when t-ReselectionRAT is set to a value among 0, 0.1, 0.2, 0.3, 0.4...1, the UE of the present disclosure moving at a high speed has a lower cell reselection timer value than the cell reselection timer value of a typical normal UE moving at a low speed, and thus it can enter a medium mobility state or a high mobility state faster than a typical normal UE moving at a low speed.

[0371] -t-EvaluationUAV: Duration of evaluation criteria to enter a mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 20 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, or 240 seconds may be signaled. This parameter may include a value that is less than the typical t-Evaluation value. This is to enable a UE according to the present disclosure to enter a medium mobility state or a high mobility state more quickly.

[0372] ■t-EvaluationUAV can indicate T CRmaxUAV , and this specifies the duration for evaluating the amount of allowed cell selection(s).

[0373] -t-HystNormalUAV: Additional duration for evaluating criteria to enter the Normal mobility state. For example, one of the values ​​such as 5 seconds, 10 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, 240 seconds, or 360 seconds may be signaled. This parameter may include values ​​that are smaller or larger than the typical t-HystNormal. The reason for including a small value is that the UE transitions to the Normal mobility state quickly, and the reason for including a large value is that the UE transitions to the Normal mobility state slowly.

[0374] ■t-HystNormalUAV can indicate T CRmaxHystUAV , and this specifies an additional time period before the UE can enter the normal mobility state.

[0375] -n-CellChangeMediumUAV: The number of cell changes to enter the medium mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled. This parameter may include a value that is smaller than the value of the typical n-CellChangeMedium. This is to enable a UE according to the present disclosure to enter the medium mobility state more quickly.

[0376] ■n-CellChangeMediumUAV can indicate N CR_MUAV , and this specifies the maximum number of cell reselections to enter the medium mobility state.

[0377] -n-CellChangeHighUAV: The number of cell changes to enter a high mobility state. For example, one of the integer values ​​from 1 (or from 0) to 16 may be signaled, and a value greater than the value of n-CellChangeMediumUAV may be signaled. This parameter may include a value less than the typical n-CellChangeHigh. This is to enable a UE according to the present disclosure to enter a high mobility state more quickly.

[0378] ■n-CellChangeHigh can indicate N CR_H , and this specifies the maximum number of cell reselections to enter the high mobility state.

[0379] -q-HystSFUAV: Speed-based ScalingFactor parameter

[0380] ■sf-MediumUAV: Additional hysteresis parameter value used in medium mobility state. For example, a value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​smaller than the typical sf-Medium value, and this is intended to facilitate UE reselection of neighbor cells.

[0381] ■sf-HighUAV: Additional hysteresis parameter value used in high mobility state. A value among -10dB, -8dB, -6dB, -4dB, -2dB and 0dB may be signaled. This parameter may include values ​​less than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0382] -t-Reselection-SFUAV (per NR frequency): SpeedStateScaleFactors parameter

[0383] ■sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​smaller than the typical sf-Medium value and this is intended to facilitate UE reselection of neighbor cells.

[0384] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value and this is intended to facilitate UE reselection of neighbor cells.

[0385] -t-ReselectionEUTRA-SFUAV (per EUTRA frequency or common to all EUTRA frequencies): SpeedStateScaleFactors parameter

[0386] ■sf-MediumUAV: Additional mobility control related parameter value used in medium mobility state. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-Medium value, and this is intended to facilitate reselection of neighbor cells.

[0387] ■sf-HighUAV: Additional mobility control related parameter value used in high mobility state. For example, a value among 0.25, 0.5, 0.75 and 1 may be signaled. For example, a value among 0.1, 0.125, 0.25, 0.5, 0.75 and 1 may be signaled. This parameter may include values ​​that are smaller than the typical sf-High value, and this is intended to facilitate UE reselection of neighbor cells.

[0388] - A value indicating how many seconds after the UE camps on a serving cell a cell reselection is possible.

[0389] ■ Typically, reselection to a neighbor cell is possible after one second has elapsed since the UE camped on the current serving cell, but the new value includes a value less than one second, enabling a UE according to the present disclosure to reselect a neighbor cell faster than one second.

[0390] - Speed ​​threshold

[0391] ■ Depends on the speed threshold, if the speed of the UE is faster than the speed threshold or equal to or faster than the speed threshold, speed dependent reselection parameters can be applied. Otherwise, typical speed dependent reselection parameters can be applied.

[0392] In step 1i-15, UE 1i-01 in RRC idle mode or RRC inactive mode may perform a cell selection or cell reselection procedure. This can be performed by following the above embodiment or by applying at least one of the parameters described above in step 1i-10.

[0393] In step 1i-20, the UE 1i-01 in RRC idle mode or RRC inactive mode may determine the mobility state. In the case where the UAV-capable UE acquires the new speed-dependent reselection parameter in step 1i-05 or step 1i-10, it may determine the mobility state according to a predetermined criterion based on the new speed-dependent reselection parameter depending on the speed threshold (which may be acquired in step 1i-05 or step 1i-10 or determined directly in the UE). For reference, if the new speed-dependent reselection parameter is configured in step 1i-05, the UE may apply the new speed-dependent reselection parameter included in the RRC connection release message.

[0394] -Medium mobility status standard

[0395] ■If in time period T CRmax (or T CRmaxUAV ) The number of cell reselections during the period is greater than or equal to N CR_M (or N CR_MUAV ) but less than or equal to N CR_H (or N CR_H-UAV )

[0396] - High mobility status standard

[0397] ■If in time period T CRmax (or T CRmaxUAV ) The number of cell reselections during the period is greater than N CR_H (or N CR_H-UAV )

[0398] -Normal mobility status standard

[0399] ■If in time period T CRmaxHystUAV or T CRmaxHyst The criteria for medium or high mobility states are not detected during the period, or if during the period T CRmaxUAV (or T CRmax ) The number of cell reselections during this period is less than N CR_M (or N CR_MUAV )

[0400] The UE may perform a cell reselection procedure by applying a scaling rule according to the determined mobility state. Specifically,

[0401] - If neither medium mobility state nor high mobility state is detected,

[0402] ■Do not apply scaling.

[0403] - If a high mobility state is detected,

[0404] ■ Add sf-HighUAV (or sf-High) for “Speed-dependent ScalingFactor for Qhyst” to Qhyst if broadcasted in system information.

[0405] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-HighUAV (or sf-High) of “Speed-dependent Scalingfactor for TreselectionNRuav (or TreselectionNR)”.

[0406] ■ For EUTRA cells, if broadcasted in the system information, TreselectionEUTRAUAV (or TreselectionEUTRA) is multiplied by sf-HighUAV (or sf-High) of the “Speed ​​dependent Scalingfactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0407] - If a medium mobility state is detected,

[0408] ■ Add sf-MediumUAV (or sf-Medium) for "Speed-dependent ScalingFactor for Qhyst" to Qhyst if broadcasted in system information.

[0409] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-MediumUAV (or sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionNRuav (or TreselectionNR)”.

[0410] ■ For EUTRA cells, if broadcasted in the system information, multiply TreselectionEUTRAUAV (or TreselectionETURA) by sf-MediumUAV (sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0411] For reference, in case scaling is applied to any TreselectionRAT parameter, the UE shall round up the result to the nearest second after all scaling.

[0412] For reference, if the UAV-supporting UE or the non-UAV-supporting UE fails to acquire the new speed-dependent reselection parameter in step 1i-05 or step 1i-10, it can determine the mobility state based on the above-described embodiment. In addition, even if the UE speed is slower than the speed threshold or if it is equal to or slower than the speed threshold, the mobility state can be determined using the typical speed-dependent reselection parameter.

[0413] In step 1i-20, the UE may perform the cell reselection procedure specified in step 1i-15 by reflecting the scaling result according to the determined mobility state.

[0414] In step 1i-25, UE 1i-01 in RRC idle mode or RRC inactive mode may initiate an RRC connection establishment process or an RRC connection recovery process to establish an RRC connection with base station 1i-02. That is, in step 1i-25, the UE may send an RRC connection request message (RRCSetupRequest) or an RRC connection recovery request message (RRCResumeRequest or RRCResumeRequest1) to the base station. In step 1i-30, the base station may send an RRC connection establishment message (RRCSetup) or an RRC connection recovery message (RRCResume) to the UE in response to the RRC connection request message or the RRC connection recovery request message. In step 1i-31, the UE that has received the RRC connection establishment message or the RRC connection recovery message may switch to RRC connection mode (RRC_CONNECTED). Then, in step 1i-35, the UE in RRC connection mode may send an RRC connection establishment completion message (RRCSetupComplete) or an RRC connection recovery completion message (RRCResumeComplete) to the base station. At this time, the RRC connection establishment complete message or the RRC connection recovery complete message may include the new mobility state of the UE (mobility state of the UAV) or the typical mobility state. Specifically, the RRC connection establishment complete message or the RRC connection recovery complete message may include mobilityStateUAV or mobilityState and set it to the mobility state of the UE just before entering the RRC_CONNECTED state (as specified in TS 38.304).

[0415] According to the present disclosure, in the case where the UE speed is greater than the speed threshold, it is possible to determine the mobility state or perform cell reselection by applying the new speed-dependent reselection parameter. Even in the case where the UE speed is greater than the speed threshold, if there is no new speed-dependent reselection parameter, it is possible to determine the mobility state or perform cell reselection according to a typical method.

[0416] Figure 1J is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0417] The UE in the next generation mobile communication system according to this embodiment may mean a UE capable of receiving unmanned aerial vehicle (UAV) services. Alternatively, the UE in the next generation mobile communication system according to this embodiment may mean a UE capable of flying or moving at high speed or a UE capable of applying a newly defined mobility state determination method. The UE capable of receiving UAV services may meet the following requirements specified in 3GPP TS 22.125. In particular, the UE is capable of receiving UAV services while moving at high speed. In the case of typical mobility state determination, a UE moving at high speed may enter a medium mobility state or a high mobility state much later despite its high speed. Accordingly, in this embodiment, a mobility state determination method for the above-mentioned UE is proposed.

[0418]

[0419] Referring to Figure 1J, in step 1j-03, UE 1j-01 can establish an RRC connection with the NR cell 1j-02 and is therefore in RRC connected mode (RRC_CONNECTED).

[0420] In step 1j-04, the UE 1j-01 in RRC connected mode may send a UE capability information message (UECapabilityInformation) to the NR cell 1j-02. The message may include at least one of the following items.

[0421] - Indicators to support enhanced mobility state determination

[0422] - Indicator indicating UAV UE

[0423] -Indicator indicating that new speed dependent reselection parameters included in system information or RRC connection release message can be applied

[0424] In step 1j-05, the NR cell 1j-02 may send an RRC connection release message (RRCRelease) to the UE 1j-01 in RRC connection mode. The message may include a new speed dependent reselection parameter. The new speed dependent reselection parameter may indicate at least one of the following items.

[0425] -κ for t-ReselectionRAT: This parameter indicates the scaling factor for the typical t-ReselectionRAT. This parameter is multiplied or added to the typical parameter to enable the UE to perform cell reselection faster.

[0426] - α for t-Evaluation: This parameter indicates the scaling factor used for the typical t-Evaluation. This parameter is multiplied or added to the typical parameter to enable the UE to determine the mobility state faster.

[0427] -β for t-HystNormal: This parameter indicates the scaling factor for the typical t-HystNormal. This parameter is multiplied or added to the typical parameter to enable the UE to transition to the normal mobility state faster or slower.

[0428] -γ for n-CellChangeMedium: This parameter indicates the scaling factor for the typical n-CellChangeMedium. This parameter is multiplied or added to the typical parameter to enable the UE to enter the medium mobility state faster.

[0429] - Delta for n-CellChangeHigh: This parameter indicates the scaling factor for the typical n-CellChangeHigh. This parameter is added or multiplied with the typical parameter to enable the UE to enter the high mobility state faster.

[0430] -q-HystSFUAV: Speed-based ScalingFactor parameter

[0431] ■θ for sf-Medium: This parameter indicates the scaling factor for the typical parameter sf-Medium. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0432] ■μ for sf-High: This parameter indicates the scaling factor for the typical parameter sf-High. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0433] -t-Reselection-SF (per NR frequency): SpeedStateScaleFactors parameter

[0434] ■ρ for sf-Medium: This parameter indicates the scaling factor for the typical parameter sf-Medium. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0435] ■φ for sf-High: This parameter indicates the scaling factor for the typical parameter sf-High. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0436] -t-ReselectionEUTRA-SF (per EUTRA frequency or common to all EUTRA frequencies): SpeedStateScaleFactors parameter

[0437] ■ω for sf-Medium: This parameter indicates the scaling factor for the typical parameter sf-Medium. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0438] ■τ for sf-High: This parameter indicates the scaling factor for the typical parameter sf-High. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0439] - A value or scaling factor indicating after how many seconds the UE camps on the serving cell that cell reselection is possible.

[0440] ■ Normally, reselection to a neighbor cell is possible after one second has elapsed since the UE camped on the current serving cell, but the new value has a value less than one second or as a scaling factor multiplied by one second, enabling the UE to reselect a neighbor cell faster than one second.

[0441] - New timer value

[0442] ■ The new timer value indicates the time to apply the new speed dependent reselection scaling parameter described above. If the new timer value is included, the UE according to the present disclosure can drive the new timer with the new timer value.

[0443] - Speed ​​threshold

[0444] ■ If the speed of the UE is greater than the speed threshold, new speed dependent reselection scaling parameters may be applied. Otherwise, typical speed dependent reselection scaling parameters may be applied.

[0445] In step 1j-06, the UE 1j-01 receiving the RRC connection release message may transition to an RRC idle mode (RRC_IDLE) or an RRC inactive mode (RRC_INACTIVE).

[0446] In step 1j-10, UE 1j-01 in RRC idle mode or RRC inactive mode may receive or obtain system information from base station 1j-02. The system information may include parameters for the UE to perform a cell selection or cell reselection process. This may follow the embodiments described above. In addition, base station 1j-02 may broadcast system information including a new scaling parameter (SpeedStateSelectionScalingPars) for determining the mobility state of the UE.

[0447] -κ for t-ReselectionRAT: This parameter indicates the scaling factor for the typical t-ReselectionRAT. This parameter is multiplied or added to the typical parameter to enable the UE to perform cell reselection faster.

[0448] ■ t-ReselectionRATUAV = t-Reselection + κ or κ × t-ReselectionRAT

[0449] - α for t-Evaluation: This parameter indicates the scaling factor used for the typical t-Evaluation. This parameter is multiplied or added to the typical parameter to enable the UE to determine the mobility state faster.

[0450] ■ T CRmaxUAV = TCRmax + α or α × T CRmax

[0451] -β for t-HystNormal: This parameter indicates the scaling factor for the typical t-HystNormal. This parameter is multiplied or added to the typical parameter to enable the UE to transition to the normal mobility state faster or slower.

[0452] ■ T CRmaxHystUAV = T CRmaxHyst + β or β × T CRmaxHyst

[0453] -γ for n-CellChangeMedium: This parameter indicates the scaling factor for the typical n-CellChangeMedium. This parameter is multiplied or added to the typical parameter to enable the UE to enter the medium mobility state faster.

[0454] ■ N CR_MUAV = N CR_MUAV + γ or γ × N CR_MUAV

[0455] - Delta for n-CellChangeHigh: This parameter indicates the scaling factor for the typical n-CellChangeHigh. This parameter is added or multiplied with the typical parameter to enable the UE to enter the high mobility state faster.

[0456] ■ N CR_HUAV = N CR_HUAV + δ or δ × N CR_HUAV

[0457] -q-HystSFUAV: Speed-based ScalingFactor parameter

[0458] ■θ for sf-Medium: This parameter indicates the scaling factor for the typical parameter sf-Medium. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0459] ◆ sf-MediumUAV = sf-Medium + θ or θ × sf-Medium

[0460] ■μ for sf-High: This parameter indicates the scaling factor for the typical parameter sf-High. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0461] ◆ sf-HighUAV = sf-High + μ or μ × sf-High

[0462] -t-Reselection-SF (per NR frequency): SpeedStateScaleFactors parameter

[0463] ■ρ for sf-Medium: This parameter indicates the scaling factor for the typical parameter sf-Medium. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0464] ◆ sf-MediumUAV = sf-Medium + ρ or ρ × sf-Medium

[0465] ■φ for sf-High: This parameter indicates the scaling factor for the typical parameter sf-High. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0466] ◆ sf-HighUAV = sf-High + φ or φ × sf-High

[0467] -t-ReselectionEUTRA-SF (per EUTRA frequency or common to all EUTRA frequencies): SpeedStateScaleFactors parameter

[0468] ■ω for sf-Medium: This parameter indicates the scaling factor for the typical parameter sf-Medium. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0469] ◆ sf-MediumUAV = sf-Medium + ω or ω × sf-Medium

[0470] ■τ for sf-High: This parameter indicates the scaling factor for the typical parameter sf-High. This parameter is multiplied or added to the typical parameter to enable the UE to reselect neighbor cells faster.

[0471] ◆ sf-HighUAV = sf-High + τ or τ × sf-High

[0472] - A value or scaling factor indicating after how many seconds the UE camps on the serving cell that cell reselection is possible.

[0473] ■ Normally, reselection to a neighbor cell is possible after one second has elapsed since the UE camped on the current serving cell, but the new value has a value less than one second or as a scaling factor multiplied by one second, enabling the UE to reselect a neighbor cell faster than one second.

[0474] - Speed ​​threshold

[0475] ■ If the speed of the UE is greater than the speed threshold, new speed dependent reselection scaling parameters may be applied. Otherwise, typical speed dependent reselection scaling parameters may be applied.

[0476] In step 1j-15, the UE 1j-01 in RRC idle mode or RRC inactive mode may perform a cell selection or cell reselection procedure. This can be performed by following the above described embodiment or by applying at least one of the parameters described above in step 1j-10.

[0477] In step 1j-20, the UE 1j-01 in RRC idle mode or RRC inactive mode may determine the mobility state. In the case where the UE supporting UAV acquires the new speed-dependent reselection scaling parameter in step 1j-05 or step 1j-10, it may determine the mobility state according to a predetermined criterion by considering the new speed-dependent reselection scaling parameter in addition to the typical speed-dependent reselection parameter. For reference, if the new speed-dependent reselection scaling parameter is configured in step 1j-05, the UE may apply the new speed-dependent reselection scaling parameter included in the RRC connection release message. Alternatively, in the case where the UE supporting UAV 1j-01 acquires the new speed-dependent reselection parameter in step 1j-05 or step 1j-10, it may determine the mobility state according to a predetermined criterion based on the new speed-dependent reselection scaling parameter depending on a speed threshold (which may be acquired in step 1j-05 or step 1j-10 or determined directly in the UE).

[0478] -Medium mobility status standard

[0479] ■If in time period T CRmax (or T CRmaxUAV ) The number of cell reselections during the period is greater than or equal to N CR_M (or N CR_MUAV ) but less than or equal to N CR_H (or N CR_H-UAV )

[0480] - High mobility status standard

[0481] ■If in time period T CRmax (or T CRmaxUAV ) The number of cell reselections during the period is greater than N CR_H (or N CR_H-UAV )

[0482] -Normal mobility status standard

[0483] ■If in time period T CRmaxHystUAV or T CRmaxHyst The criteria for medium or high mobility states are not detected during the period, or if during the period T CRmaxUAV (or T CRmax ) The number of cell reselections during this period is less than N CR_M (or N CR_MUAV )

[0484] The UE may perform a cell reselection procedure by applying a scaling rule according to the determined mobility state. Specifically,

[0485] - If neither medium mobility state nor high mobility state is detected,

[0486] ■Do not apply scaling.

[0487] - If a high mobility state is detected,

[0488] ■ Add sf-HighUAV (or sf-High) for “Speed-dependent ScalingFactor for Qhyst” to Qhyst if broadcasted in system information.

[0489] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-HighUAV (or sf-High) of “Speed-dependent Scalingfactor for TreselectionNRuav (or TreselectionNR)”.

[0490] ■ For EUTRA cells, if broadcasted in the system information, TreselectionEUTRAUAV (or TreselectionEUTRA) is multiplied by sf-HighUAV (or sf-High) of the “Speed ​​dependent Scalingfactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0491] - If a medium mobility state is detected,

[0492] ■ Add sf-MediumUAV (or sf-Medium) for "Speed-dependent ScalingFactor for Qhyst" to Qhyst if broadcasted in system information.

[0493] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-MediumUAV (or sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionNRuav (or TreselectionNR)”.

[0494] ■ For EUTRA cells, if broadcasted in the system information, multiply TreselectionEUTRAUAV (or TreselectionETURA) by sf-MediumUAV (sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0495] For reference, in case scaling is applied to any TreselectionRAT parameter, the UE shall round up the result to the nearest second after all scaling.

[0496] For reference, if the UAV-capable UE or the non-UAV-capable UE fails to acquire the new speed-dependent reselection scaling parameter in step 1j-05 or step 1j-10, it can determine the mobility state based on the above-described embodiment. In addition, even if the UE speed is slower than the speed threshold or if it is equal to or slower than the speed threshold, the mobility state can be determined using the typical speed-dependent reselection parameter.

[0497] In step 1j-20, the UE may perform the cell reselection procedure specified in step 1j-15 by reflecting the scaling result according to the determined mobility state.

[0498] In step 1j-25, UE 1j-01 in RRC idle mode or RRC inactive mode may initiate an RRC connection establishment process or an RRC connection recovery process to establish an RRC connection with base station 1j-02. That is, in step 1j-25, the UE may send an RRC connection request message (RRCSetupRequest) or an RRC connection recovery request message (RRCResumeRequest or RRCResumeRequest1) to the base station. In step 1j-30, the base station may send an RRC connection establishment message (RRCSetup) or an RRC connection recovery message (RRCResume) to the UE in response to the RRC connection request message or the RRC connection recovery request message. In step 1j-31, the UE that has received the RRC connection establishment message or the RRC connection recovery message may switch to RRC connection mode (RRC_CONNECTED). Then, in step 1j-35, the UE in RRC connection mode may send an RRC connection establishment completion message (RRCSetupComplete) or an RRC connection recovery completion message (RRCResumeComplete) to the base station. At this time, the RRC connection establishment complete message or the RRC connection recovery complete message may include the new mobility state of the UE (mobility state of the UAV) or the typical mobility state. Specifically, the RRC connection establishment complete message or the RRC connection recovery complete message may include mobilityStateUAV or mobilityState and set it to the mobility state of the UE just before entering the RRC_CONNECTED state (as specified in TS 38.304).

[0499] According to the present disclosure, in the case of UAV UE, if the new speed dependent reselection scaling parameter is broadcast or configured, the UAV UE is able to determine the mobility state or perform cell reselection by applying the new speed dependent reselection scaling parameter. Even in the case of UAV UE, if it does not have the new speed dependent reselection scaling parameter, it is also able to determine the mobility state or perform cell reselection according to a typical method. Alternatively, according to the present disclosure, in the case where the UE speed is greater than a speed threshold, it is possible to determine the mobility state or perform cell reselection by applying the new speed dependent reselection scaling parameter. Even in the case where the UE speed is greater than the speed threshold, it is possible to determine the mobility state or perform cell reselection according to a typical method if there is no new speed dependent reselection scaling parameter.

[0500] Figure 1K is a flowchart showing a process in which a UE reports a mobility status to an NR base station in a next generation mobile communication system according to an embodiment of the present disclosure.

[0501] The UE in the next generation mobile communication system according to this embodiment may mean a UE capable of receiving unmanned aerial vehicle (UAV) services. Alternatively, the UE in the next generation mobile communication system according to this embodiment may mean a UE capable of flying or moving at high speed or a UE capable of applying a newly defined mobility state determination method. The UE capable of receiving UAV services may meet the following requirements specified in 3GPP TS 22.125. In particular, the UE is capable of receiving UAV services while moving at high speed. In the case of typical mobility state determination, a UE moving at high speed may enter a medium mobility state or a high mobility state much later despite its high speed. Accordingly, in this embodiment, a mobility state determination method for the above-mentioned UE is proposed.

[0502]

[0503] Referring to Figure 1K, in step 1k-03, UE 1k-01 can establish an RRC connection with the NR cell 1k-02 and is therefore in RRC connected mode (RRC_CONNECTED).

[0504] In step 1k-04, UE 1k-01 in RRC connected mode may send a UE capability information message (UECapabilityInformation) to NR cell 1k-02. The message may include at least one of the following items.

[0505] - Indicators to support enhanced mobility state determination

[0506] - Indicator indicating UAV UE

[0507] -Indicator indicating that new speed dependent reselection parameters included in system information or RRC connection release message can be applied

[0508] In step 1k-05, the NR cell 1k-02 may send an RRC connection release message (RRCRelease) to the UE 1k-01 in RRC connection mode. The message may include new speed-dependent reselection parameters or new speed-dependent reselection scaling parameters. This may follow the embodiments described above. In addition, the message may include at least one of the following items.

[0509] - One or more speed thresholds

[0510] ■In the case where the UE speed is greater than (alternatively, greater than or equal to) a speed threshold, the UE may enter a medium mobility state or a high mobility state. Specifically, in the case where multiple speed thresholds are set and the UE speed is greater than (alternatively, greater than or equal to) s1, the UE may enter a high mobility state and apply typical speed-dependent reselection parameters or new speed-dependent reselection (scaling) parameters. In the case where the UE speed is less than (alternatively, less than or equal to) s1 and greater than (alternatively, greater than or equal to) s2, the UE may enter a medium mobility state and apply typical speed-dependent reselection parameters or new speed-dependent reselection (scaling) parameters. In the case where the UE speed is less than (alternatively, less than or equal to) s2, the UE may enter a normal mobility state. In the case where the UE speed is greater than (alternatively, greater than or equal to) s1 and one speed threshold is set, the UE may enter a high mobility state and apply typical speed-dependent reselection parameters or new speed-dependent reselection (scaling) parameters.

[0511] - New timer value

[0512] ■ A timer value for determining whether the UE speed meets the above criteria during the new timer value. That is, if the above criteria are met during the relevant time period, the UE may enter the medium mobility state or the high mobility state.

[0513] In step 1k-06, the UE 1k-01 receiving the RRC connection release message may transition to an RRC idle mode (RRC_IDLE) or an RRC inactive mode (RRC_INACTIVE).

[0514] In step 1k-10, UE 1k-01 in RRC idle mode or RRC inactive mode may receive or obtain system information from base station 1k-02. The system information may include parameters for the UE to perform a cell selection or cell reselection process. This may follow the embodiments described above. In addition, base station 1k-02 may broadcast system information including new scaling parameters (SpeedStateSelectionScalingPars or SpeedStateSelectionPars) for determining the mobility state of the UE. This may follow the embodiments described above. In addition, the system information may include at least one of the following items.

[0515] - One or more speed thresholds

[0516] ■In the case where the UE speed is greater than (alternatively, greater than or equal to) a speed threshold, the UE may enter a medium mobility state or a high mobility state. Specifically, in the case where multiple speed thresholds are set and the UE speed is greater than (alternatively, greater than or equal to) s1, the UE may enter a high mobility state and apply typical speed-dependent reselection parameters or new speed-dependent reselection (scaling) parameters. In the case where the UE speed is less than (alternatively, less than or equal to) s1 and greater than (alternatively, greater than or equal to) s2, the UE may enter a medium mobility state and apply typical speed-dependent reselection parameters or new speed-dependent reselection (scaling) parameters. In the case where the UE speed is less than (alternatively, less than or equal to) s2, the UE may enter a normal mobility state. In the case where the UE speed is greater than (alternatively, greater than or equal to) s1 and one speed threshold is set, the UE may enter a high mobility state and apply typical speed-dependent reselection parameters or new speed-dependent reselection (scaling) parameters.

[0517] - New timer value

[0518] ■ A timer value for determining whether the UE speed meets the above criteria during the new timer value. That is, if the above criteria are met during the relevant time period, the UE may enter the medium mobility state or the high mobility state.

[0519] In step 1k-15, UE 1k-01 in RRC idle mode or RRC inactive mode may perform a cell selection or cell reselection procedure. This can be performed by following the above-described embodiment or by applying at least one of the parameters described above in step 1k-10.

[0520] In step 1k-20, the UE 1k-01 in RRC idle mode or RRC inactive mode may determine the mobility state. In the case where the UE supporting UAV is able to apply the speed threshold configured in step 1k-05 or step 1k-10 or is able to determine the mobility state itself based on the speed threshold, it may determine the mobility state by the following predetermined criteria.

[0521] -Medium mobility status standard

[0522] ■ In the case where the UE speed is less than (alternatively, less than or equal to) s1 and greater than (alternatively, greater than or equal to) s2

[0523] ■ Alternatively, transition to the medium mobility state when the above criteria are met within the period of the new timer value

[0524] - High mobility status standard

[0525] ■ In the case where the UE speed is greater than (alternatively, greater than or equal to) s1

[0526] ■ Alternatively, transition to the high mobility state when the above criteria are met within the period of the new timer value

[0527] -Normal mobility status standard

[0528] In the case where the UE speed is less than (alternatively, less than or equal to) s2

[0529] ■ Alternatively, in the case where the medium mobility criterion or the high mobility criterion is not met,

[0530] The UE may perform a cell reselection procedure by applying a scaling rule according to the determined mobility state. Specifically,

[0531] - If neither medium mobility state nor high mobility state is detected,

[0532] ■Do not apply scaling.

[0533] - If a high mobility state is detected,

[0534] ■ Add sf-HighUAV (or sf-High) for “Speed-dependent ScalingFactor for Qhyst” to Qhyst if broadcasted in system information.

[0535] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-HighUAV (or sf-High) of “Speed-dependent ScalingFactor for TreselectionNRuav (or TreselectionNR)”.

[0536] ■ For EUTRA cells, if broadcasted in the system information, multiply TreselectionEUTRAUAV (or TreselectionEUTRA) by sf-HighUAV (or sf-High) of the “Speed-dependent ScalingFactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0537] - If a medium mobility state is detected,

[0538] ■ Add sf-MediumUAV (or sf-Medium) for "Speed-dependent ScalingFactor for Qhyst" to Qhyst if broadcasted in system information.

[0539] ■For NR cells, if broadcasted in the system information, multiply TreselectionNRUAV (or TreselectionNR) by sf-MediumUAV (or sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionNRuav (or TreselectionNR)”.

[0540] ■ For EUTRA cells, if broadcasted in the system information, multiply TreselectionEUTRAUAV (or TreselectionETURA) by sf-MediumUAV (sf-Medium) of the “Speed-dependent ScalingFactor for TreselectionEUTRAUAV (or TreselectionEUTRA)”.

[0541] For reference, where scaling is applied to any TreselectionRAT parameter, the UE shall round the result up to the nearest second after all scaling.

[0542] In step 1k-20, the UE may perform the cell reselection procedure specified in step 1k-15 by reflecting the scaling result according to the determined mobility state.

[0543] In step 1k-25, UE 1k-01 in RRC idle mode or RRC inactive mode may initiate an RRC connection establishment process or an RRC connection recovery process to establish an RRC connection with base station 1k-02. That is, in step 1k-25, the UE may send an RRC connection request message (RRCSetupRequest) or an RRC connection recovery request message (RRCResumeRequest or RRCResumeRequest1) to the base station. In step 1k-30, the base station may send an RRC connection establishment message (RRCSetup) or an RRC connection recovery message (RRCResume) to the UE in response to the RRC connection request message or the RRC connection recovery request message. In step 1k-31, the UE that has received the RRC connection establishment message or the RRC connection recovery message may switch to RRC connection mode (RRC_CONNECTED). Then, in step 1k-35, the UE in RRC connection mode may send an RRC connection establishment completion message (RRCSetupComplete) or an RRC connection recovery completion message (RRCResumeComplete) to the base station. At this time, the RRC connection establishment complete message or the RRC connection recovery complete message may include the new mobility state of the UE (mobility state of the UAV) or the typical mobility state. Specifically, the RRC connection establishment complete message or the RRC connection recovery complete message may include mobilityStateUAV or mobilityState and set it to the mobility state of the UE just before entering the RRC_CONNECTED state (as specified in TS 38.304).

[0544] According to the present disclosure, the speed of the UE can be used to determine the mobility state or perform cell reselection according to a speed threshold.

[0545] Figure 1L is a flowchart showing a process in which a UE reports flight path information to an NR base station through an RRC connection recovery process in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0546] The UE in the next generation mobile communication system according to this embodiment may mean a UE capable of receiving an unmanned aerial vehicle (UAV) service. Alternatively, the UE in the next generation mobile communication system according to this embodiment may mean a UE capable of flying or reporting flight path information.

[0547] Referring to Figure 1L, in step 1l-03, UE 1l-01 can establish an RRC connection with NR cell 1l-02 and is therefore in RRC connected mode (RRC_CONNECTED).

[0548] In step 11-04, UE 11-01 in RRC connected mode may send a UE capability information message (UECapabilityInformation) to NR cell 11-02. The message may include at least one of the following items.

[0549] - Indicator indicating UAV UE

[0550] - Indicator indicating the ability to report flight path information

[0551] In step 1l-05, the NR cell 1l-02 may send an RRC connection release message (RRCRelease) to the UE 1l-01 in the RRC connected mode, so that the UE may switch to the RRC inactive mode (RRC_INACTIVE) in step 1l-06.

[0552] In step 1l-10, UE 1l-01 in RRC inactive mode can initiate an RRC connection recovery procedure and send an RRC connection recovery request message (RRCResumeRequest or RRCResumeRequest1) to the NR cell 1l-02.

[0553] In step 11-15, the NR cell 11-02 may send an RRC connection resumption message (RRCResume) to the UE 11-02. In the present disclosure, the message may include an indicator (flightPathInfoReq) to report flight path information.

[0554] In step 11-16, UE 11-01 may transition to RRC connected mode by applying an RRC connection recovery message.

[0555] In step 11-20, the UE 11-01 in RRC connected mode may send an RRC connection recovery completion message (RRCResumeComplete) to the NR cell 11-02. The message may include flight path information (flightPathInfoReport). In addition, a time value (timestamp) for each flight path may be included. That is, it may mean information about which point is reached at what time. Of course, the UE may include an indicator (flightPathInfoAvailable) of the presence of flight path information in RRCResumeComplete.

[0556] FIG. 1M is a block diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0557] 1M , the UE includes a Radio Frequency (RF) processor 1m - 10, a baseband processor 1m - 20, a memory 1m - 30, and a controller 1m - 40.

[0558] The RF processor 1m-10 performs functions such as frequency band conversion and signal amplification for sending and receiving signals via a radio channel. That is, the RF processor 1m-10 converts the baseband signal provided by the baseband processor 1m-20 up to an RF band signal, then sends the RF band signal via an antenna, and down-converts the RF band signal received via the antenna to a baseband signal. For example, the RF processor 1m-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like. Although only one antenna is shown in FIG. 1M, 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 strength of the signal to be sent or received via multiple antennas or antenna elements, respectively. In addition, the RF processor 1m-10 may perform MIMO operations and may receive multiple layers in MIMO operations.

[0559] The baseband processor 1m-20 converts between baseband signals and bit streams based on the physical entity specifications of the system. For example, when data is transmitted, the baseband processor 1m-20 generates complex symbols by encoding and modulating the transmitted bit stream. When data is received, the baseband processor 1m-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1m-10. For example, in accordance with the orthogonal frequency division multiplexing (OFDM) scheme, when data is transmitted, the baseband processor 1m-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols by performing inverse fast Fourier transform (IFFT) and cyclic prefix (CP) insertion. When data is received, the baseband processor 1m-20 segments the baseband signal provided from the RF processor 1m-10 into OFDM symbol units, reconstructs the signal mapped to the subcarrier by performing fast Fourier transform (FFT), and then reconstructs the received bit stream by demodulating and decoding the signal.

[0560] As described above, the baseband processor 1m-20 and the RF processor 1m-10 send and receive signals. Therefore, the baseband processor 1m-20 and the RF processor 1m-10 may also be referred to as a transmitter, a receiver, a transceiver, or a communicator. In addition, at least one of the baseband processor 1m-20 or the RF processor 1m-10 may include multiple communication modules to support a variety of different radio access technologies. In addition, at least one of the baseband processor 1m-20 or the RF processor 1m-10 may include different communication modules to process signals of different frequency bands. For example, different radio 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., 2NRHz, NRHz) bands and millimeter wave (mmWave) (e.g., 60GHz) bands.

[0561] The memory 1m-30 stores basic programs, applications, and data (e.g., configuration information) for the operation of the UE. Specifically, the memory 1m-30 may store information related to a second access node that performs wireless communication using a second radio access technology. And, the memory 1m-30 provides the stored data according to a request of the controller 1m-40.

[0562] The controller 1m-40 controls the overall operation of the UE. For example, the controller 1m-40 sends and receives signals through the baseband processor 1m-20 and the RF processor 1m-10. In addition, the controller 1m-40 records data on the memory 1m-30 or 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 (CP) for controlling communication and an application processor (AP) for controlling an upper layer such as an application.

[0563] Figure 1N is a block diagram showing the structure of an NR base station according to an embodiment of the present disclosure.

[0564] 1N , the base station may include an RF processor 1n-10, a baseband processor 1n-20, a backhaul communicator 1n-30, a memory 1n-40, and a controller 1n-50.

[0565] The RF processor 1n-10 performs functions of sending and receiving signals via a radio channel, such as frequency band conversion and amplification of signals. That is, the RF processor 1n-10 converts the baseband signal provided by the baseband processor 1n-20 up to an RF band signal, then sends the RF band signal via an antenna, and down-converts the RF band signal received via the antenna to a baseband signal. For example, the RF processor 1n-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in FIG. 1N, the first access node may include multiple antennas. In addition, the RF processor 1n-10 may include multiple RF chains. In addition, the RF processor 1n-10 may perform beamforming. For beamforming, the RF processor 1n-10 may adjust the phase and strength of the signal to be sent or received via multiple antennas or antenna elements, respectively. The RF processor may perform downlink MIMO operations by sending one or more layers.

[0566] The baseband processor 1n-20 converts between baseband signals and bit streams based on the physical entity specifications of the radio access technology. For example, when data is transmitted, the baseband processor 1n-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when data is received, the baseband processor 1n-20 reconstructs 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 scheme, when data is transmitted, the baseband processor 1n-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols by performing IFFT and CP insertion. In addition, when data is received, the baseband processor 1n-20 segments the baseband signal provided by the RF processor 1n-10 into OFDM symbol units, reconstructs the signal mapped to the subcarrier by performing FFT, and then reconstructs the received bit stream by demodulating and decoding the signal. As described above, the baseband processor 1n-20 and the RF processor 1n-10 send and receive signals. Therefore, the baseband processor 1n-20 and the RF processor 1n-10 may also be referred to as a transmitter, a receiver, a transceiver, a communicator, or a wireless communicator.

[0567] The backhaul communicator 1n-30 provides an interface for communicating with other nodes in the network. That is, the backhaul communicator 1n-30 converts a bit stream sent from the main base station to any other node (e.g., an auxiliary base station, a core network, etc.) into a physical signal, and converts a physical signal received from such other nodes into a bit stream.

[0568] The memory 1n-40 stores basic programs, applications, and data (e.g., configuration information) for the operation of the master base station. Specifically, the memory 1n-40 may store information such as bearers allocated for connected UEs and measurement results reported from connected UEs. In addition, the memory 1n-40 may store standard information for determining whether to provide dual connectivity to the UE or release dual connectivity from the UE. The memory 1n-40 may provide stored data according to a request of the controller 1n-50.

[0569] The controller 1n-50 may control the overall operation of the master base station. For example, the controller 1n-50 sends and receives signals through the baseband processor 1n-20 and the RF processor 1n-10 or the backhaul communicator 1n-30. In addition, the controller 1n-50 records data on the memory 1n-40 or reads data from the memory 1n-40. To this end, the controller 1n-50 may include at least one processor.

Claims

1. A method performed by a terminal in a wireless communication system, the method include: receiving, from a base station, a message including parameters for determining a mobility state of a terminal; identifying, in a message, information for determining a mobility state of an unmanned aerial vehicle (UAV) terminal; as well as The mobility state of the terminal is determined based on the information used to determine the mobility state of the UAV terminal.

2. The method according to claim 1, in, The message includes a first parameter set for determining the mobility state of a normal terminal and a second parameter set for determining the mobility state of a UAV terminal.

3. The method according to claim 1, in, The message includes a parameter set for determining the mobility state of a normal terminal and a scaling factor for determining the mobility state of a UAV terminal, Therein, a scaling factor for determining the mobility state of the UAV terminal is applied to the parameter set.

4. The method according to claim 1, in, The message includes at least one of a Radio Resource Control (RRC) connection release message and a System Information Block (SIB) message.

5. The method according to claim 1, further comprising: include: The determined mobility state of the terminal is sent to the base station.

6. A terminal in a wireless communication system, the terminal include: transceivers, which send and receive signals; and The controller is configured as: receiving, from a base station, a message including parameters for determining a mobility state of a terminal, identifying, in a message, information for determining a mobility state of an unmanned aerial vehicle (UAV) terminal, and The mobility state of the terminal is determined based on the information used to determine the mobility state of the UAV terminal.

7. The terminal according to claim 6, in, The message includes a first parameter set for determining the mobility state of a normal terminal and a second parameter set for determining the mobility state of a UAV terminal.

8. The terminal according to claim 6, in, The message includes a parameter set for determining the mobility state of a normal terminal and a scaling factor for determining the mobility state of a UAV terminal, Therein, a scaling factor for determining the mobility state of the UAV terminal is applied to the parameter set.

9. The terminal according to claim 6, in, The message includes at least one of a Radio Resource Control (RRC) connection release message and a System Information Block (SIB) message.

10. The terminal according to claim 6, in, The controller is further configured to send the determined mobility state of the terminal to the base station.

11. A method performed by a base station in a wireless communication system, the method include: sending a message including parameters for determining a mobility state of the terminal to the terminal; as well as receiving a mobility state of the terminal from the terminal, The received mobility state of the terminal is determined by the terminal based on information in the message used to determine the mobility state of an unmanned aerial vehicle (UAV) terminal.

12. The method according to claim 11, in, The message includes a first parameter set for determining the mobility state of a normal terminal and a second parameter set for determining the mobility state of a UAV terminal.

13. The method according to claim 11, in, The message includes a parameter set for determining the mobility state of a normal terminal and a scaling factor for determining the mobility state of a UAV terminal, Therein, a scaling factor for determining the mobility state of the UAV terminal is applied to the parameter set.

14. The method according to claim 11, in, The message includes at least one of a Radio Resource Control (RRC) connection release message and a System Information Block (SIB) message.

15. A base station in a wireless communication system, the base station include: transceivers, which send and receive signals; and The controller is configured as: sending a message including parameters for determining the mobility state of the terminal to the terminal, and receiving a mobility state of the terminal from the terminal, The received mobility state of the terminal is determined by the terminal based on information in the message used to determine the mobility state of an unmanned aerial vehicle (UAV) terminal.

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