Acquisition of reference position of NTN earth mobile cell

Abstract

A method and apparatus for acquiring a reference position of a non-terrestrial network (NTN) earth mobile cell. A wireless device receives assistance information from a serving cell. The assistance information includes i) a set of reference positions and ii) temporal information associated with each of the reference positions. The wireless device selects a reference position related to the current time from among a reference position set based on the time information.

Description

Technical Field

[0001] The present disclosure relates to acquiring a reference position of a non-terrestrial network (NTN) earth-moving cell. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a technology for implementing high-speed packet communications. Many solutions have been proposed for the LTE goal, including those aimed at reducing user and provider costs, improving service quality, and expanding and improving coverage and system capacity. 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of frequency bands, simple structure, open interfaces, and appropriate power consumption of terminals as higher-level requirements.

[0003] The International Telecommunication Union (ITU) and 3GPP have begun work to develop requirements and specifications for New Radio (NR) systems. 3GPP must identify and develop the technical components needed to successfully standardize a new RAT that meets both urgent market needs in a timely manner and longer-term requirements set forth by the ITU Radiocommunication Sector (ITU-R) International Mobile Telecommunications (IMT)-2020 process. In addition, even in the more distant future, NR should be able to use any spectrum band available for wireless communications up to at least 100 GHz.

[0004] NR targets a single technology framework that addresses all use cases, requirements, and deployment scenarios, including enhanced mobile broadband (eMBB), massive machine type communications (mMTC), ultra-reliable low latency communications (URLLC), etc. NR should be inherently forward compatible.

[0005] Non-terrestrial networks (NTN) are being studied. The basic idea of ​​NTN is to provide 5G / NR services via space (satellite) or air (airborne platform). If realized as expected, it will be possible to deliver 5G services to those places that are technically very difficult or too costly to deliver using terrestrial networks. Some examples of these places would be remote areas, such as deep forests where the cost is too high when delivering over land, or far islands or ships where terrestrial connections are almost technically prohibited.

[0006] 3GPP Release 17 specifications will support NR-based satellite access deployed in the Frequency Range -1 (FR1) band serving handheld devices for global service continuity. Equally exciting, 3GPP Release 17 specifications will support satellite access based on Narrowband Internet of Things (NB-IoT) and Enhanced Machine Type Communications (eMTC) to address massive IoT use cases such as agriculture, transportation, logistics and more.

[0007] This joint effort between the mobile and satellite industries will enable full integration of satellite in the 3GPP ecosystem and define global standards for future satellite networks. This will address accessibility and service continuity challenges in unserved / underserved areas, enhance reliability through connectivity between different access technologies, and improve network resilience and reliability to respond to natural and man-made disasters. Summary of the invention

[0008] Technical Solution

[0009] In one aspect, a method performed by a wireless device adapted to operate in a wireless communication system is provided. The method includes receiving assistance information from a serving cell. The assistance information includes i) a set of reference locations and ii) time information associated with each of the reference locations. The method includes selecting a reference location associated with a current time from among the set of reference locations based on the time information.

[0010] In another aspect, a device for implementing the above method is provided.

[0011] Beneficial Effects

[0012] The present disclosure may have various beneficial effects.

[0013] For example, when a geomobile serving cell serves the UE, the UE may obtain a reference position of the geomobile serving cell at a specific time.

[0014] For example, the UE may perform location-based measurements and CHO based on a reference location of an earth mobile serving cell.

[0015] The beneficial effects that can be obtained by the specific embodiments of the present disclosure are not limited to the beneficial effects listed above. For example, there are various technical effects that a person of ordinary skill in the relevant field can understand and / or derive from the present disclosure. Therefore, the specific effects of the present disclosure are not limited to those effects explicitly described herein, but can include various effects that can be understood or derived from the technical features of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An example of a communication system to which an implementation of the present disclosure is applied is shown.

[0017] Figure 2 An example of a wireless device to which an implementation of the present disclosure is applied is shown.

[0018] Figure 3 An example of a UE to which an implementation of the present disclosure is applied is shown.

[0019] Figure 4 and Figure 5An example of a protocol stack in a 3GPP-based wireless communication system to which an implementation of the present disclosure is applied is shown.

[0020] Figure 6 The frame structure in a 3GPP-based wireless communication system to which the implementation of the present disclosure is applied is shown.

[0021] Figure 7 An example of data flow in a 3GPP NR system to which an implementation of the present disclosure is applied is shown.

[0022] Figure 8 An example of a non-terrestrial network (NTN) to which implementations of the present disclosure are applied is shown.

[0023] Fig. 9 An example of a method performed by a wireless device to which an implementation of the present disclosure is applied is shown.

[0024] Fig.10 An example of a method performed by a base station to which an implementation of the present disclosure is applied is shown. DETAILED DESCRIPTION

[0025] The following techniques, devices and systems can be applied to various wireless multiple access systems. Examples of these multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and multi-carrier frequency division multiple access (MC-FDMA) systems. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data Rate for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE adopts OFDMA in the downlink (DL) and SC-FDMA in the uplink (UL). The evolutions of 3GPP LTE include LTE Advanced (LTE-A), LTE-A Pro and / or 5G New Radio (NR).

[0026] For ease of description, the embodiments of the present disclosure are mainly described with respect to a 3GPP-based wireless communication system. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP-based wireless communication system, aspects of the present disclosure that are not limited to a 3GPP-based wireless communication system are applicable to other mobile communication systems.

[0027] For terms and techniques not specifically described in the terms and techniques adopted in the present disclosure, reference may be made to wireless communication standard documents issued prior to the present disclosure.

[0028] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0029] In the present disclosure, a slash ( / ) or a comma (,) may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0030] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, the expression "at least one of A or B" or "at least one of A and / or B" in the present disclosure may be interpreted as being the same as "at least one of A and B".

[0031] In addition, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B and / or C" may mean "at least one of A, B, and C".

[0032] In addition, the brackets used in the present disclosure may mean "for example". In detail, when it is shown as "control information (PDCCH)", "PDCCH" may be proposed as an example of "control information". In other words, in the present disclosure, "control information" is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information". In addition, even when it is shown as "control information (ie, PDCCH)", "PDCCH" may be proposed as an example of "control information".

[0033] The technical features described separately in one figure in the present disclosure can be implemented separately or simultaneously.

[0034] Although not limited to this, the various descriptions, functions, processes, suggestions, methods and / or operational flowcharts of the present disclosure disclosed herein may be applied to various fields requiring wireless communication and / or connection between devices (e.g., 5G).

[0035] Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings. Unless otherwise specified, the same reference numerals in the following drawings and / or descriptions may refer to the same and / or corresponding hardware blocks, software blocks and / or functional blocks.

[0036] Figure 1 An example of a communication system to which an embodiment of the present disclosure is applied is shown.

[0037] exist Figure 1 The 5G usage scenarios shown in the present disclosure are only exemplary, and the technical features of the present disclosure may be applied to Figure 1 Other 5G usage scenarios shown in .

[0038] The three main demand categories for 5G include: (1) enhanced mobile broadband (eMBB) category, (2) massive machine type communication (mMTC) category, and (3) ultra-reliable and low-latency communication (URLLC) category.

[0039] Reference Figure 1 , the communication system 1 includes wireless devices 100a to 100f, a base station (BS) 200, and a network 300. Figure 1 A 5G network is illustrated as an example of a network of the communication system 1 , but the embodiments of the present disclosure are not limited to the 5G system and may be applied to future communication systems other than the 5G system.

[0040] BS 200 and network 300 may be implemented as wireless devices, and a specific wireless device may operate as a BS / network node relative to other wireless devices.

[0041] The wireless devices 100a to 100f represent devices that perform communication using a radio access technology (RAT) (e.g., 5G NR or LTE) and may be referred to as communication / wireless / 5G devices. The wireless devices 100a to 100f may include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. A vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters.

[0042] In the present disclosure, the wireless devices 100a to 100f may be referred to as user equipment (UE). For example, the UE may include a cellular phone, a smart phone, a laptop computer, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a plate-shaped personal computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle with an autonomous driving function, a connected car, a UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a Fintech device (or a financial device), a security device, a weather / environmental device, a device related to 5G services, or a device related to the field of the fourth industrial revolution.

[0043] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a super 5G network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BS 200 / network 300. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0044] Wireless communication / connection 150a, 150b, and 150c may be established between wireless devices 100a to 100f and / or between wireless devices 100a to 100f and BS 200 and / or between BS 200. In this document, wireless communication / connection may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)), etc. Wireless devices 100a to 100f and BS 200 / wireless devices 100a to 100f may send / receive radio signals to each other through wireless communication / connection 150a, 150b, and 150c. For example, wireless communication / connection 150a, 150b, and 150c may send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of the resource allocation process may be performed based on various proposals of the present disclosure.

[0045] NR supports multiple parameter sets (and / or multiple subcarrier spacing (SCS)) to support various 5G services. For example, if the SCS is 15kHz, wide areas can be supported in traditional cellular bands, and if the SCS is 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. If the SCS is 60kHz or higher, bandwidths greater than 24.25GHz can be supported to overcome phase noise.

[0046] The NR frequency band may be defined as two types of frequency ranges, namely, frequency range 1 (FR1) and frequency range 2 (FR2). The numerical values ​​of the frequency ranges may be changed. For example, the two types of frequency ranges (FR1 and FR2) may be as shown in Table 1 below. For ease of explanation, in the frequency range used in the NR system, FR1 may mean "a range below 6 GHz", FR2 may mean "a range above 6 GHz", and may be referred to as millimeter wave (mmW).

[0047] [Table 1]

[0048] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0049] As mentioned above, the value of the frequency range of the NR system can be changed. For example, FR1 may include 410 MHz to 7125 MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or above. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or above included in FR1 may include an unlicensed frequency band. The unlicensed frequency band can be used for various purposes, for example, communication of vehicles (e.g., autonomous driving).

[0050] [Table 2]

[0051] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0052] Here, the radio communication technology implemented in the wireless device in the present disclosure may include narrowband IoT (NB-IoT) technology for low-power communication as well as LTE, NR and 6G. For example, NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, which may be implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the names mentioned above. Additionally and / or alternatively, the radio communication technology implemented in the wireless device in the present disclosure may be based on LTE-M technology for communication. For example, LTE-M technology may be an example of LPWAN technology and is referred to as various names such as enhanced MTC (eMTC). For example, LTE-M technology may be implemented in at least one of various specifications such as 1) LTE CaT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and may not be limited to the above names. Additionally and / or alternatively, the radio communication technology implemented in the wireless device in the present disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN considering low-power communication, and may not be limited to the names mentioned above. For example, ZigBee technology may generate a personal area network (PAN) associated with small / low-power digital communication based on various specifications such as IEEE 802.15.4, and may be referred to as various names.

[0053] Figure 2 An example of a wireless device to which an embodiment of the present disclosure is applied is shown.

[0054] exist Figure 2 In the embodiment, the first wireless device 100 and / or the second wireless device 200 may be implemented in various forms according to the usage / service. For example, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 1 At least one of {wireless devices 100a to 100f and BS200}, {wireless devices 100a to 100f and wireless devices 100a to 100f} and / or {BS200 and BS200}. The first wireless device 100 and / or the second wireless device 200 may be configured by various elements, devices / components and / or modules.

[0055] The first wireless device 100 may include at least one transceiver, such as the transceiver 106 ; at least one processing chip, such as the processing chip 101 ; and / or one or more antennas 108 .

[0056] The processing chip 101 may include at least one processor, such as the processor 102, and at least one memory, such as the memory 104. Additionally and / or alternatively, the memory 104 may be placed outside the processing chip 101.

[0057] The processor 102 may control the memory 104 and / or the transceiver 106 and may be adapted to implement the descriptions, functions, processes, suggestions, methods and / or operational flow charts described in the present disclosure. For example, the processor 102 may process the information in the memory 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal through the transceiver 106. The processor 102 may receive a radio signal including a second information / signal through the transceiver 106 and then store information obtained by processing the second information / signal in the memory 104.

[0058] The memory 104 may be operably connected to the processor 102. The memory 104 may store various types of information and / or instructions. The memory 104 may store firmware and / or software code 105 that implements codes, commands, and / or sets of commands that, when executed by the processor 102, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 105 may control the processor 102 to execute one or more protocols. For example, the firmware and / or software code 105 may control the processor 102 to execute one or more layers of a radio interface protocol.

[0059] In this document, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and send and / or receive radio signals through one or more antennas 108. Each of the transceivers 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, the first wireless device 100 may represent a communication modem / circuit / chip.

[0060] The second wireless device 200 may include at least one transceiver, such as the transceiver 206 ; at least one processing chip, such as the processing chip 201 ; and / or one or more antennas 208 .

[0061] The processing chip 201 may include at least one processor, such as the processor 202, and at least one memory, such as the memory 204. Additionally and / or alternatively, the memory 204 may be placed outside the processing chip 201.

[0062] The processor 202 may control the memory 204 and / or the transceiver 206 and may be adapted to implement the descriptions, functions, processes, suggestions, methods and / or operational flow charts described in the present disclosure. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204.

[0063] The memory 204 may be operably connected to the processor 202. The memory 204 may store various types of information and / or instructions. The memory 204 may store firmware and / or software code 205 that implements codes, commands, and / or sets of commands that, when executed by the processor 202, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 205 may control the processor 202 to execute one or more protocols. For example, the firmware and / or software code 205 may control the processor 202 to execute one or more layers of a radio interface protocol.

[0064] In this document, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and send and / or receive radio signals through one or more antennas 208. Each of the transceivers 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0065] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY), layer, medium access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, radio resource control (RRC) layer, and service data adaptation protocol (SDAP) layer). One or more processors 102 and 202 may generate one or more protocol data units (PDUs), one or more service data units (SDUs), messages, control information, data, or information according to the descriptions, functions, processes, suggestions, methods, and / or operation flow charts disclosed in the present disclosure. The one or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in the present disclosure and provide the generated signal to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from the one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in the present disclosure.

[0066] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. For example, one or more processors 102 and 202 may be configured by a collection of a communication control processor, an application processor (AP), an electronic control unit (ECU), a central processing unit (CPU), a graphics processing unit (GPU), and a memory control processor. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions, and / or commands.

[0067] The one or more memories 104 and 204 may be configured by random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EPROM), flash memory, volatile memory and non-volatile memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. The one or more memories 104 and 204 may be located inside and / or outside the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connections.

[0068] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the description, function, process, suggestion, method, and / or operation flow chart disclosed in the present disclosure to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the description, function, process, suggestion, method, and / or operation flow chart disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.

[0069] One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. Additionally and / or alternatively, one or more transceivers 106 and 206 may include one or more antennas 108 and 208. One or more transceivers 106 and 206 may be adapted to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. In the present disclosure, one or more antennas 108 and 208 may be multiple physical antennas or multiple logical antennas (e.g., antenna ports).

[0070] The one or more transceivers 106 and 206 may convert received user data, control information, radio signals / channels, etc. from RF band signals to baseband signals so as to process the received user data, control information, radio signals / channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals / channels, etc. processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and / or filters. For example, the one or more transceivers 106 and 206 may up-convert OFDM baseband signals to OFDM signals through their (analog) oscillators and / or filters under the control of the one or more processors 102 and 202 and transmit the up-converted OFDM signals at the carrier frequency. The one or more transceivers 106 and 206 may receive an OFDM signal at a carrier frequency and down-convert the OFDM signal to an OFDM baseband signal through their (analog) oscillators and / or filters under the control of the one or more processors 102 and 202 .

[0071] Although in Figure 2 140 , but the wireless devices 100 and 200 may further include additional components. The additional components 140 may be configured differently depending on the type of the wireless devices 100 and 200. For example, the additional components 140 may include at least one of a power unit / battery, an input / output (I / O) device (e.g., an audio I / O port, a video I / O port), a drive device, and a computing device. The additional components 140 may be coupled to the one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0072] In an embodiment of the present disclosure, a UE may operate as a transmitting device in UL and as a receiving device in DL. In an embodiment of the present disclosure, a BS may operate as a receiving device in UL and as a transmitting device in DL. In the following, for the convenience of description, it is mainly assumed that the first wireless device 100 is a UE and the second wireless device 200 is a BS. For example, the processor 102 connected to, installed on, or started in the first wireless device 100 may be suitable for executing the UE behavior according to the embodiment of the present disclosure or controlling the transceiver 106 to execute the UE behavior according to the embodiment of the present disclosure. The processor 202 connected to, installed on, or started in the second wireless device 200 may be suitable for executing the BS behavior according to the embodiment of the present disclosure or controlling the transceiver 206 to execute the BS behavior according to the embodiment of the present disclosure.

[0073] In this disclosure, a BS is also referred to as a Node B (NB), an eNode B (eNB), or a gNB.

[0074] Figure 3 An example of a UE to which an embodiment of the present disclosure is applied is shown.

[0075] refer to Figure 3 , UE 100 may correspond to Figure 2 A first wireless device 100 is provided.

[0076] UE 100 includes a processor 102 , a memory 104 , a transceiver 106 , one or more antennas 108 , a power management module 141 , a battery 142 , a display 143 , a keypad 144 , a subscriber identity module (SIM) card 145 , a speaker 146 , and a microphone 147 .

[0077] The processor 102 may be configured to implement the descriptions, functions, processes, suggestions, methods and / or operational flow charts disclosed in the present disclosure. The processor 102 may be configured to control one or more other components of the UE 100 to implement the descriptions, functions, processes, suggestions, methods and / or operational flow charts disclosed in the present disclosure. The layers of the radio interface protocol may be implemented in the processor 102. The processor 102 may include an ASIC, other chipsets, logic circuits and / or data processing devices. The processor 102 may be an application processor. The processor 102 may include at least one of a DSP, a CPU, a GPU, a modem (modulator and demodulator). Examples of the processor 102 may be found at MANUFACTURED BY SNAPDRAGON TM Series processors, Manufactured by EXYNOS TM Series processors, A series processors manufactured by Made by HELIO TM Series processors, ATOM manufactured TM series processors or corresponding next-generation processors.

[0078] The memory 104 is operably coupled to the processor 102 and stores a variety of information to operate the processor 102. The memory 104 may include ROM, RAM, flash memory, memory card, storage medium and / or other storage devices. When the embodiment is implemented in software, the technology described herein can be implemented with modules (e.g., processes, functions, etc.) that execute the descriptions, functions, processes, suggestions, methods and / or operational flow charts disclosed in the present disclosure. The modules can be stored in the memory 104 and executed by the processor 102. The memory 104 can be implemented within the processor 102 or outside the processor 102, in which case the memory 104 can be communicatively coupled to the processor 102 via various means known in the art.

[0079] The transceiver 106 is operably coupled to the processor 102 and transmits and / or receives radio signals. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include a baseband circuit for processing radio frequency signals. The transceiver 106 controls one or more antennas 108 to transmit and / or receive radio signals.

[0080] The power management module 141 manages the power of the processor 102 and / or the transceiver 106. The battery 142 supplies power to the power management module 141.

[0081] The display 143 outputs the result processed by the processor 102. The keyboard 144 receives input to be used by the processor 102. The keyboard 144 may be shown on the display 143.

[0082] The SIM card 145 is an integrated circuit designed to securely store an International Mobile Subscriber Identity (IMSI) number and its associated keys, which are used to identify and authenticate subscribers on mobile telephony devices such as mobile phones and computers. Contact information can also be stored on many SIM cards.

[0083] The speaker 146 outputs sound related results processed by the processor 102. The microphone 147 receives sound related input to be used by the processor 102.

[0084] Figure 4 and Figure 5 An example of a protocol stack in a 3GPP-based wireless communication system to which an implementation of the present disclosure is applied is shown.

[0085] Specifically, Figure 4 An example of a radio interface user plane protocol stack between a UE and a BS is illustrated, and Figure 5An example of a radio interface control plane protocol stack between a UE and a BS is illustrated. The control plane refers to a path through which control messages for managing calls made between a UE and a network are transmitted. The user plane refers to a path through which data generated in an application layer (e.g., voice data or Internet packet data) is transmitted. Figure 4 , the user plane protocol stack can be divided into layer 1 (ie, PHY layer) and layer 2. Figure 5 , the control plane protocol stack can be divided into layer 1 (ie, PHY layer), layer 2, layer 3 (eg, RRC layer), and non-access stratum (NAS) layer. Layer 1, layer 2, and layer 3 are called access stratum (AS).

[0086] In the 3GPP LTE system, Layer 2 is separated into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, Layer 2 is separated into the following sublayers: MAC, RLC, PDCP, and SDAP. The PHY layer provides transport channels to the MAC sublayer, the MAC sublayer provides logical channels to the RLC sublayer, the RLC sublayer provides RLC channels to the PDCP sublayer, and the PDCP sublayer provides radio bearers to the SDAP sublayer. The SDAP sublayer provides Quality of Service (QoS) flows to the 5G core network.

[0087] In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing / demultiplexing MAC SDUs belonging to one or different logical channels to / from transport blocks (TBs) on transport channels for delivery to / from the physical layer; scheduling information reporting; error correction through hybrid automatic repeat request (HARQ) (one HARQ entity per cell in the case of carrier aggregation (CA); priority handling between UEs through dynamic scheduling; priority handling between logical channels of one UE through logical channel prioritization; padding. A single MAC entity can support multiple parameter sets, transmission timings, and cells. The mapping restrictions in the logical channel prioritization control which parameter set(s), cell, and transmission timing can be used by the logical channel.

[0088] MAC provides different kinds of data transmission services. In order to accommodate different kinds of data transmission services, multiple types of logical channels are defined, that is, each logical channel supports the transmission of a specific type of information. Each logical channel type is defined by what type of information is transmitted. Logical channels are divided into two groups: control channels and traffic channels. Control channels are used only for the transmission of control plane information, and traffic channels are used only for the transmission of user plane information. The broadcast control channel (BCCH) is a downlink logical channel for broadcasting system control information, the paging control channel (PCCH) is a downlink logical channel for transmitting paging information, system information change notifications, and indications of ongoing public warning services (PWS) broadcasts, the common control channel (CCCH) is a logical channel used to send control information between the UE and the network and is used by UEs that do not have an RRC connection with the network, and the dedicated control channel (DCCH) is a point-to-point bidirectional logical channel used by UEs with RRC connections to send dedicated control information between the UE and the network. The dedicated traffic channel (DTCH) is a point-to-point logical channel dedicated to one UE for transmitting user information. DTCH can exist in both the uplink and downlink. In the downlink, there are the following connections between logical channels and transport channels: BCCH can be mapped to the broadcast channel (BCH); BCCH can be mapped to the downlink shared channel (DL-SCH); PCCH can be mapped to the paging channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH. In the uplink, there are the following connections between logical channels and transport channels: CCCH can be mapped to the uplink shared channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0089] The RLC sublayer supports three transmission modes: transparent mode (TM), unacknowledged mode (UM) and acknowledged mode (AM). The RLC configuration is per logical channel without dependency on parameter sets and / or transmission duration. In 3GPP NR systems, the main services and functions of the RLC sublayer depend on the transmission mode and include: delivery of upper layer PDUs; sequence numbering independent of sequence numbering in PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDUs (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM).

[0090] In the 3GPP NR system, the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using robust header compression (RoHC); transmission of user data; reordering and duplicate detection; in-sequence delivery; PDCP PDU routing (in the case of split bearers); retransmission of PDCP SDU; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; PDCP PDU duplication and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transmission of control plane data; reordering and duplicate detection; in-sequence delivery; PDCP PDU duplication and duplicate discard indication to lower layers.

[0091] In 3GPP NR system, the main services and functions of SDAP include: mapping between QoS flows and data radio bearers; marking QoS flow ID (QFI) in both DL and UL packets. A single protocol entity of SDAP is configured for each individual PDU session.

[0092] In the 3GPP NR system, the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by the 5G core network (5GC) or the next generation radio access network (NG-RAN); establishment, maintenance and release of the RRC connection between the UE and the NG-RAN; security functions including key management; establishment, configuration, maintenance and release of signaling radio bearers (SRBs) and data radio bearers (DRBs); mobility functions (including: handover and context transfer, UE cell selection and reselection and control of cell selection and reselection, inter-RAT mobility); QoS management functions; UE measurement reporting and control of reporting; detection and recovery of radio link failures; NAS message transmission from UE to NAS / from NAS to UE.

[0093] Figure 6 The frame structure in a 3GPP-based wireless communication system to which the implementation of the present disclosure is applied is shown.

[0094] Figure 6The frame structure shown in is merely exemplary, and the number of subframes, the number of time slots, and / or the number of symbols in a frame may vary. In a 3GPP-based wireless communication system, OFDM parameter sets (e.g., SCS, transmission time interval (TTI) duration) may be configured differently between multiple cells aggregated for one UE. For example, if the UE is configured with different SCSs for cells aggregated for the cell, the (absolute time) duration of time resources (e.g., subframes, time slots, or TTIs) including the same number of symbols may be different among the aggregated cells. In this article, the symbol may include an OFDM symbol (or a cyclic prefix (CP)-OFDM symbol), an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0095] Reference Figure 6 , downlink and uplink transmissions are organized into frames. Each frame has T f = 10ms duration. Each frame is divided into two half-frames, where each half-frame has a duration of 5ms. Each half-frame includes 5 sub-frames, where the duration of each sub-frame is T sf is 1ms. Each subframe is divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on the CP. In a normal CP, each slot includes 14 OFDM symbols, and in an extended CP, each slot includes 12 OFDM symbols. The parameter set is based on an exponentially scalable subcarrier spacing Δf=2 u *15kHz.

[0096] Table 3 shows the subcarrier spacing Δf=2 u *N is the number of OFDM symbols per time slot of 15kHz slot symb , the number of time slots per frame N frame,u slot , and the number of time slots N per subframe for normal CP subframe,u slot .

[0097] [Table 3]

[0098] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe，u slot ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0099] Table 4 shows the subcarrier spacing Δf=2 u *N is the number of OFDM symbols per time slot of 15kHz slot symb , the number of time slots per frame N frame,u slot and the number of slots N per subframe for the extended CPsubframe,u slot .

[0100] [Table 4]

[0101] <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe，u slot ]]> 2 12 40 4

[0102] A slot includes a plurality of symbols (e.g., 14 or 12 symbols) in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, a common resource block (CRB) N indicated by higher layer signaling (e.g., RRC signaling) is allocated. start,u grid To begin, we define N size,u grid,x *N RB sc subcarriers and N subframe,u symb OFDM symbol resource grid, where N size,u grid,x is the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for the downlink and UL for the uplink. N RB sc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, N RB sc Typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL), there is one resource grid. The carrier bandwidth N for subcarrier spacing configuration u size,u grid Given by high-level parameters (e.g., RRC parameters). Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing the symbol position relative to a reference point in the time domain.

[0103] In 3GPP-based wireless communication systems, an RB is defined by 12 consecutive subcarriers in the frequency domain. In 3GPP NR systems, RBs are classified into CRBs and physical resource blocks (PRBs). CRBs are numbered upwards from 0 in the frequency domain for subcarrier spacing configuration u. The center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with "point A" used as a common reference point for the resource block grid. In 3GPP NR systems, PRBs are defined within bandwidth parts (BWPs) and are numbered from 0 to N. size BWP,i -1 numbering, where i is the number of the bandwidth part. Physical resource block n in bandwidth part i PRB With common resource block n CRB The relationship between is as follows:PRB =n CRB +N size BWP,i , where N size BWP,i It is a common resource block where the bandwidth part starts relative to CRB 0. A BWP includes multiple consecutive RBs. A carrier can include up to N (e.g., 5) BWPs. A UE can be configured with one or more BWPs on a given component carrier. Only one BWP can be activated at a time among the BWPs configured for a UE. The active BWP defines the operating bandwidth of the UE within the operating bandwidth of the cell.

[0104] In the present disclosure, the term "cell" may refer to a geographical area where one or more nodes provide a communication system or to a radio resource. "Cell" as a geographical area can be understood as a coverage range in which a node can provide services using a carrier, and "cell" as a radio resource (e.g., time-frequency resource) is associated with a bandwidth, which is a frequency range configured by a carrier. A "cell" associated with a radio resource is defined by a combination of downlink resources and uplink resources (e.g., a combination of DL component carriers (CCs) and UL CCs). A cell may be configured only by downlink resources, or may be configured by downlink resources and uplink resources. Since the DL coverage (which is the range in which a node can send a valid signal) and the UL coverage (which is the range in which a node can receive a valid signal from a UE) depend on the carrier that carries the signal, the coverage of a node may be associated with the coverage of a "cell" of a radio resource used by the node. Therefore, the term "cell" may be used to sometimes represent the service coverage of a node, to represent a radio resource at other times, or to represent the range in which a signal using a radio resource can reach with effective strength at other times.

[0105] In CA, two or more CCs are aggregated. The UE can receive or transmit on one or more CCs simultaneously according to its capabilities. CA is supported for both continuous CCs and non-contiguous CCs. When CA is configured, the UE has only one RRC connection with the network. When the RRC connection is established / reestablished / switched, one serving cell provides NAS mobility information, and when the RRC connection is reestablished / switched, one serving cell provides security input. This cell is called the primary cell (PCell). PCell is a cell operating on the primary frequency, where the UE performs an initial connection establishment process or initiates a connection reestablishment process. Depending on the UE capabilities, the secondary cell (SCell) can be configured to form a set of serving cells together with the PCell. SCell is a cell that provides additional radio resources on top of a special cell (PCell). Therefore, the set of configured serving cells for the UE always consists of one PCell and one or more SCells. For dual connection (DC) operation, the term "PCell" refers to the PCell of the primary cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG). SpCell supports physical uplink control channel (PUCCH) transmission and contention-based random access, and is always activated. MCG is a set of serving cells associated with the master node, which includes SpCell (PCell) and optionally one or more SCells. For UEs configured with DC, SCG is a subset of serving cells associated with the secondary node, which includes PSCell and zero or more SCells. For UEs in RRC_CONNECTED that are not configured with CA / DC, there is only one serving cell consisting of PCell. For UEs in RRC_CONNECTED that are configured with CA / DC, the term "serving cell" is used to refer to the set of cells consisting of SpCell and all SCells. In DC, two MAC entities are configured in the UE: one for MCG and one for SCG.

[0106] Figure 7 An example of data flow in a 3GPP NR system to which an implementation of the present disclosure is applied is shown.

[0107] Reference Figure 7 , "RB" means radio bearer, and "H" means header. Radio bearers are classified into two groups: DRB for user plane data and SRB for control plane data. MAC PDU is transmitted / received to / from an external device through the PHY layer using radio resources. MAC PDU arrives at the PHY layer in the form of a transport block.

[0108] In the PHY layer, the uplink transport channel UL-SCH and the random access channel (RACH) are mapped to their physical channels, the physical uplink shared channel (PUSCH) and the physical random access channel (PRACH), respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to the physical downlink shared channel (PDSCH), the physical broadcast channel (PBCH) and the PDSCH, respectively. In the PHY layer, the uplink control information (UCI) is mapped to the physical PUCCH, and the downlink control information (DCI) is mapped to the physical downlink control channel (PDCCH). The MAC PDU related to the UL-SCH is sent by the UE via the PUSCH based on the UL grant, and the MAC PDU related to the DL-SCH is sent by the BS via the PDSCH based on the DL assignment.

[0109] Figure 8 An example of a non-terrestrial network (NTN) to which implementations of the present disclosure are applied is shown.

[0110] NTN provides non-terrestrial NR access to UEs with the help of NTN payload and NTN gateway. Figure 8 , describes the service link between the NTN payload and the UE, and the feeder link between the NTN gateway and the NTN payload.

[0111] The NTN payload transparently forwards the radio protocol received from the UE (via the serving link) to the NTN Gateway (via the feeder link) and vice versa. The NTN payload supports the following connections:

[0112] -gNB can serve multiple NTN payloads;

[0113] -NTN payload can be served by multiple gNBs.

[0114] The NTN-payload can change the carrier frequency before retransmitting it on the serving link and vice versa (same on the feeder link).

[0115] For NTN, the following network identification (ID) further applies.

[0116] - A Tracking Area (TA) corresponds to a fixed geographical area. Any corresponding mapping is configured in the RAN;

[0117] - Mapped cell ID

[0118] Non-geosynchronous orbits (NGSO) include low earth orbits (LEO) with altitudes between approximately 300 km and 1500 km and medium earth orbits (MEO) with altitudes between approximately 7000 km and 25000 km.

[0119] Three types of service links are supported:

[0120] - Geostationary: provided by beams that continuously cover the same geographical area at all times (e.g. in the case of geosynchronous orbit (GSO) satellites);

[0121] - Quasi-Earth Fixed: provided by a beam that covers one geographical area during a limited period of time and a different geographical area during another period of time (e.g., the case of steerable beams generated by NGSO satellites);

[0122] - Earth mobile: provided by a beam whose coverage area slides along the surface of the Earth (e.g. in the case of a NGSO satellite generating a fixed or non-steerable beam).

[0123] Using NGSO satellites, gNBs can provide quasi-Earth fixed cell coverage or Earth mobile cell coverage, while gNBs operated using GSO satellites can provide Earth fixed cell coverage.

[0124] In the case of NGSO, serving link switching refers to the change of serving satellite.

[0125] For measurements in NTN, the network can be configured as follows:

[0126] -Configure multiple synchronization signal block (SSB) measurement timing configurations (SMTCs) in parallel for a given set of cells and per carrier, using propagation delay difference and ephemeris information, depending on UE capabilities;

[0127] -Measurement gaps based on multiple SMTC configurations.

[0128] The SMTC may be adjusted under network control based on UE assistance information if available for connected mode, and may be adjusted under UE control based on UE location and satellite assistance information (e.g., ephemeris, common TA parameters) for idle / inactive mode.

[0129] The UE may report the serving link propagation delay difference between the serving cell and the neighbor cell as auxiliary information for adjusting the SMTC in connected mode.

[0130] In the quasi-geo-fixed cell scenario, the UE may perform time-based and location-based measurements in RRC_IDLE / RRC_INACTIVE mode.

[0131] -Provide timing and location information associated with the cell via system information;

[0132] - Timing information refers to the time when the serving cell will stop serving the geographical area;

[0133] - The location information refers to the reference location of the serving cell.

[0134] Table 5 shows an example of system information block type 19 (SIB19). SIB19 may contain satellite assistance information such as the timing information and position information described above.

[0135] [Table 5]

[0136]

[0137] Referring to Table 5, the following parameters and / or fields may be defined in SIB19.

[0138] -distanceThresh: distance from the serving cell reference location and is used for location-based measurement initiation in RRC_IDLE and / or RRC_INACTIVE. Each step represents 50m.

[0139] -ntn-Config: Provides the parameters required for UE to access NR via NTN access such as ephemeris data, common TA parameters, k_offset, validity duration and epoch of UL synchronization information. The validity duration ntn-UlSyncValidityDuration is mandatory.

[0140] -ntn-NeighCellConfigList: Provides a list of NTN neighbor cells, including their ntn-Config, carrier frequency, and PhysCellId.

[0141] -referenceLocation: This field may correspond to the above-mentioned location information. This field indicates the reference location of the serving cell provided via the NTN quasi-geo-fixed system and is used for location-based measurement initiation in RRC_IDLE and RRC_INACTIVE modes.

[0142] -t-Service: This field may correspond to the above-mentioned timing information. This field indicates time information about when a cell provided via the NTN quasi-terrestrial fixed system will stop serving the area it currently covers. This field indicates the time in multiples of 10ms starting from 00:00:00 on the Gregorian calendar date January 1, 1900 (midnight between Sunday, December 31, 1899 and Monday, January 1, 1900). This field is excluded when determining system information changes (i.e., changes in t-Service should result in neither system information change notifications nor modifications to the valueTag in SIB1). The exact stop time is between the time indicated by the value of this field minus 1 and the time indicated by the value of this field.

[0143] Table 6 shows an example of the Information Element (IE) referenceLocation. The IE ReferenceLocation contains location information used as a reference location. The value of the field is the same as Ellipsoid-Point. The first / leftmost bit of the first octet contains the most significant bit.

[0144] [Table 6]

[0145]

[0146] Table 7 shows an example of IE Ellipsoid-Point. IE Ellipsoid-Point is used to describe a geographic shape.

[0147] [Table 7]

[0148]

[0149] Referring to Table 7, the following parameters and / or fields may be defined in IE ELLIPSOID-POINT.

[0150] -latitudeSign: Notify whether the latitude of the corresponding reference location is north latitude or south latitude;

[0151] -degreesLatitude: Notify the latitude of the corresponding reference location;

[0152] -degreesLongitude: Notifies the longitude degrees of the corresponding reference location.

[0153] Table 8 shows an example of IE ntn-Config. IE NTN-Config provides parameters required for UE to access NR via NTN access.

[0154] [Table 8]

[0155]

[0156] Referring to Table 8, the following parameters and / or fields may be defined in IE ntn-Config.

[0157] -EphemerisInfo: This field provides the satellite ephemeris in the format of position and velocity state vectors or in the format of orbital parameters. This field is excluded when determining system information changes (i.e., changes in EphemerisInfo should neither result in system information change notifications nor in modifications of valueTag in SIB1).

[0158] -epochTime: Indicates the epoch time for the auxiliary information (i.e., IE epochTime and serving satellite ephemeris in common TA parameters). When explicitly provided through the SIB or through dedicated signaling, EpochTime is the start time of the DL subframe, indicated by the system frame number (SFN) and the subframe number signaled together with the auxiliary information. The reference point for the epoch time for the serving satellite ephemeris and common TA parameters is the UL time synchronization reference point. If this field is not present, the epoch time is the end of the SI window that schedules this SIB19. This field is mandatory when provided in the dedicated configuration. If this field is not present in the ntn-Config provided via NTN-NeighCellConfig, the UE uses the epoch time from the serving satellite ephemeris. In case of handover, this field is based on the timing of the target cell (i.e., the SFN and subframe number indicated in this field refer to the SFN and subframe of the target cell). This field is excluded when determining system information changes (ie, a change in epochTime should neither result in a system information change notification nor in a modification of the valueTag in SIB1).

[0159] -cellSpecificKoffset: CellSpecific_K_offset is the scheduling offset for the timing relationship that needs to be modified for the NTN. The unit of K_offset is the number of time slots for a given subcarrier spacing of 15kHz. If the field is not present, the UE assumes a value of 0.

[0160] -kmac: K_mac is the scheduling offset provided by the network if the DL and UL frame timing are not aligned at the gNB. Necessary for UE actions and assumptions about the DL configuration indicated by the MAC-CE command in the PDSCH. If the field is not present, the UE assumes a value of 0. For the reference subcarrier spacing value of K_mac units in FR1, a value of 15kHz is used. The unit of K_mac is the number of slots for a given subcarrier spacing.

[0161] -ntn-PolarizationDL: If present, this parameter indicates the polarization information of DL transmissions on the serving link including right-hand circular polarization (RHCP), left-hand circular polarization (LHCP) and linear polarization.

[0162] -ntn-PolarizationUL: If present, this parameter indicates the polarization information for the UL serving link. If not present and ntnPolarizationDL is present, the UE assumes the same polarization for UL and DL.

[0163] -ntn-UlSyncValidityDuration: The validity duration configured by the network for UL synchronization assistance information (i.e., serving satellite ephemeris and common TA parameters), which indicates the maximum time the UE can apply the assistance information without acquiring new assistance information. The unit of ntn-UlSyncValidityDuration is seconds. This parameter is applicable to both connected mode UEs and idle mode UEs. This field is excluded when determining system information changes (i.e., changes in ntn-UlSyncValidityDuration should neither result in system information change notifications nor in modifications of valueTag in SIB1). ntn-UlSyncValidityDuration is only updated when at least one of epochTime, ta-Info, ephemerisInfo is updated.

[0164] -ta-Common: ta-Common is the common timing advance value controlled by the network, and it may include any timing offset deemed necessary by the network. A ta-Common value of 0 is supported. The granularity of ta-Common is 4.072×10^(-3)μs. Values ​​are given in units of the corresponding granularity. This field is excluded when determining system information changes (i.e., changes in ta-Common should neither result in system information change notifications nor in modifications of valueTag in SIB1).

[0165] -ta-CommonDrift: Indicates the drift rate of the common TA. The granularity of TACommonDrift is 0.2×10^(-3)μs / s. The value is given in units of the corresponding granularity. This field is excluded when determining system information changes (i.e., changes in ta-CommonDrift should neither result in system information change notifications nor in modifications of valueTag in SIB1).

[0166] -ta-CommonDriftVariant: Indicates the drift rate variation of the common TA. The granularity of TACommonDriftVaration is 0.2×10^(-4)μs / s^2. The value is given in units of the corresponding granularity. This field is excluded when determining system information changes (i.e., changes in ta-CommonDriftVariant should neither result in system information change notifications nor in modifications of valueTag in SIB1).

[0167] In NTN, UE and BS communicate with each other via satellite. Taking into account GSO and NSGO, NTN has been standardized in 3GPP Release 17. NGSO can be LEO. In particular, cells implemented via LEO satellites can be divided into quasi-Earth fixed cells that are fixed relative to the ground for a period of time and earth-moving cells that move along the ground. Among these two scenarios, NTN in 3GPP Release 17 focuses on the quasi-Earth fixed cell scenario for standardization.

[0168] Meanwhile, when NTN cells are deployed to satellites, the radio quality of the NTN cells measured by the UE at the cell edge may be slightly different from the radio quality at the cell center. Due to this fact, it may be difficult for the UE to notice whether it is at the cell edge through radio quality measurement. To address this issue, the introduction of location-based measurement rules and location-based CHO event enhancements in 3GPP Release 17 has been studied.

[0169] -For location-based measurements, the UE can be informed whether it is at the cell edge by comparing the distance from the cell reference location with the distance threshold broadcast by the network. In other words, the network provides the UE with the cell reference location, and if the UE is away from the cell reference location for more than a certain distance, the UE can start performing neighbor cell measurements.

[0170] -For location-based CHO event enhancement, the network may configure distance thresholds regarding the distance from the UE to the serving cell and the target cell. The UE may acquire a reference location via system information.

[0171] As mentioned above, the standardization of NTN in 3GPP Release 17 focuses on GSO and quasi-geo-fixed cells for NGSO. The common aspect of GSO and quasi-geo-fixed cells for NGSO is that they cover a fixed geographical area. Therefore, the geo-fixed cells for GSO and the quasi-geo-fixed cells for NGSO provide a single geographical coordinate for the cell reference location.

[0172] On the other hand, when the reference position of the geo-mobile cell changes over time, the UE cannot use the reference position of the quasi-geo-fixed cell indicating a single geographic coordinate. The UE does not have accurate reference position information of the geo-mobile cell, so it is impossible to perform location-based measurements introduced in 3GPP Release 17.

[0173] In order to obtain the accurate reference position of the quasi-geo-fixed cell, the UE may frequently obtain the SIB to update the reference position of the geo-mobile cell. However, the UE may consume too much power. In addition, frequent SIB acquisition may not provide the UE with an accurate reference position.

[0174] According to an embodiment of the present disclosure, the network may provide a reference location set and time information associated with each of the reference locations to the UE. In this case, the serving cell may be an earth mobile cell. Based on the reference location set and the time information associated with each of the reference locations, the UE may utilize elements of the reference location set to evaluate location-based measurements and conditional handover (CHO).

[0175] According to an embodiment of the present disclosure, in order to inform the UE of the reference position of the earth mobile cell that changes over time, the network can broadcast multiple reference positions and the time zone in which each reference position is valid. Based on this information, the UE can obtain the reference position of the earth mobile cell at a specific time.

[0176] For example, the network may provide a set of reference positions, the epoch time and the valid duration of each reference position. The UE may select the Nth element of the set as the reference position at that time (epoch time + (N-1) * valid duration).

[0177] For example, the network may provide a set of reference positions, the epoch time and the validity duration of each reference position. The UE may autonomously calculate the reference position of the Earth mobile cell by interpolating between two reference positions provided by the network.

[0178] The following figures are created to explain specific embodiments of the present disclosure. The names of specific devices or names of specific signals / messages / fields shown in the figures are provided as examples, so the technical features of the present disclosure are not limited to the specific names used in the following figures.

[0179] Fig. 9 An example of a method performed by a wireless device to which implementations of the present disclosure are applied is shown.

[0180] In step S900, the method comprises receiving assistance information from a serving cell. The assistance information comprises i) a set of reference positions and ii) time information associated with each of the reference positions.

[0181] In some implementations, the serving cell may be an earth mobile cell in the NTN.

[0182] In some implementations, the assistance information may be received per cell. The assistance information may be received via system information containing satellite information for earth mobile cells. For example, the assistance information may be received via new system information defining satellite information for earth mobile cells.

[0183] In some implementations, the reference position set may include a number N of reference positions (e.g., reference position 1, reference position 2, ..., reference position N). The reference positions in the set may be sequential in time order. Each of the reference positions may have the same field format as the Ellipsoid-Point described in Table 7 above. For example, each of the reference positions may include at least one of a latitudeSign field, a degreesLatitude field, and / or a degreesLongitude field.

[0184] In some implementations, the time information associated with each of the reference locations may include at least one of an epoch time and / or a valid duration for each of the reference locations.

[0185] In some implementations, the epoch time of each of the reference positions may be provided / represented by an absolute time point (e.g., Coordinated Universal Time (UTC)). The absolute time point may inform when each of the reference positions becomes valid. The absolute time point may be determined by the same epochTime as described in Table 8 above. For example, the absolute time point may be determined based on the epochTime field, which informs the start time of the DL subframe indicated by the SFN and the subframe number. After the absolute time point, the wireless device may select a reference position from the set of reference positions.

[0186] In some implementations, the validity duration may be provided / represented by a relative time period (e.g., seconds, minutes, hours, days). The relative time period may inform how long each of the reference positions is valid. The relative time period may be determined by being equal to ntn-UlSyncValidityDuration / N, where ntn-UlSyncValidityDuration is described in Table 8 above. For example, the relative time period may be determined based on the value of the ntn-UlSyncValidityDuration field divided by the number of reference positions.

[0187] In step S910 , the method includes selecting a reference position related to a current time from among a set of reference positions based on time information.

[0188] In some implementations, the kth element in the set may be selected as the reference position based on the current time being greater than or equal to (epoch time + (k-1) * valid duration) and less than (epoch time + k * valid duration).

[0189] In step S920, the method includes determining whether to perform neighbor cell measurement based on i) the distance between the wireless device and the reference location and ii) the distance threshold. For example, once the wireless device selects a reference location from the reference location set, the wireless device can use the selected reference location for location-based measurement and mobility during the relative period.

[0190] In some implementations, a determination to perform neighbor cell measurements may be made based on a distance between the wireless device and the reference location being shorter than a distance threshold.

[0191] In some implementations, it may be determined not to perform neighbor cell measurements based on the distance between the wireless device and the reference location being not shorter than a distance threshold.

[0192] For example, the UE uses the following rules to limit the required measurements:

[0193] 1> If the serving cell satisfies Srxlev>SIntraSearchP and Squal>SIntraSearchQ:

[0194] 2> If distanceThresh and referenceLocation are broadcast in SIB19, and if the UE supports location-based measurement initiation and has obtained its location information:

[0195] 3> If the distance between the UE and the serving cell reference location referenceLocation is shorter than distanceThresh, the UE may not perform intra-frequency measurement;

[0196] 3> Otherwise, the UE shall perform intra-frequency measurements;

[0197] 2> Otherwise, the UE may not perform intra-frequency measurements;

[0198] 1> Otherwise, the UE shall perform intra-frequency measurements.

[0199] 1> The UE shall apply the following rules to NR inter-frequencies and RAT inter-frequencies, which are indicated in the system information and for which the UE provides priority:

[0200] 2> For NR inter-frequency or RAT inter-frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements on the higher priority NR inter-frequency or RAT inter-frequency.

[0201] 2> For NR frequencies with a reselection priority equal to or lower than the reselection priority of the current NR frequency, and for RAT frequencies with a reselection priority lower than the reselection priority of the current NR frequency:

[0202] 3> If the serving cell satisfies Srxlev>SnonIntraSearchP and Squal>SnonIntraSearchQ:

[0203] 4> If distanceThresh and referenceLocation are broadcast in SIB19 and if the UE supports location-based measurement initiation and has obtained its UE location information:

[0204] 5> If the distance between the UE and the serving cell reference location referenceLocation is shorter than distanceThresh, the UE may choose not to perform measurements on NR inter-frequency cells of equal or lower priority or RAT inter-frequency cells of lower priority;

[0205] 5> Otherwise, the UE shall perform measurements on NR inter-frequency cells of equal or lower priority or RAT inter-frequency cells of lower priority;

[0206] 4> Otherwise, the UE may choose not to perform measurements on NR inter-frequency cells of equal or lower priority or RAT inter-frequency cells of lower priority;

[0207] 3> Otherwise, the UE shall perform measurements on NR inter-frequency cells of equal or lower priority or RAT inter-frequency cells of lower priority.

[0208] 1> If the UE supports relaxed measurements and relaxedMeasurement is present in SIB2, the UE may further relax the required measurements.

[0209] If t-Service of the serving cell exists in SIB19, and if the UE supports time-based measurement initiation, the UE shall perform intra-frequency, inter-frequency or inter-RAT measurements before t-Service, regardless of the distance between the UE and the serving cell reference position, or whether the serving cell satisfies Srxlev>SIntraSearchP and Squal>SIntraSearchQ, or Srxlev>SnonIntraSearchP and Squal>SnonIntraSearchQ, the UE shall perform higher priority NR inter-frequency or RAT inter-frequency measurements, regardless of the remaining service time of the serving cell (i.e., the remaining time until t-Service).

[0210] In some implementations, a wireless device may communicate with at least one of a mobile device other than the wireless device, a network, and / or an autonomous vehicle.

[0211] In addition, the above Fig. 9The method described in the wireless device perspective can be implemented by Figure 2 The first wireless device 100 and / or Figure 3 The UE 100 shown in FIG.

[0212] The wireless device includes at least one transceiver, at least one processor, and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions being executed based on the at least one processor. Fig. 9 The method described in .

[0213] More specifically, the wireless device receives assistance information from a serving cell. The assistance information includes i) a set of reference locations and ii) time information associated with each of the reference locations.

[0214] In some implementations, the serving cell may be an earth mobile cell in the NTN.

[0215] In some implementations, the assistance information may be received per cell. The assistance information may be received via system information containing satellite information for earth mobile cells. For example, the assistance information may be received via new system information defining satellite information for earth mobile cells.

[0216] In some implementations, the reference position set may include N reference positions (e.g., reference position 1, reference position 2, ..., reference position N). The reference positions in the set may be consecutive in time order. Each of the reference positions may have the same field format as the Ellipsoid-Point described in Table 7 above. For example, each of the reference positions may include at least one of a latitudeSign field, a degreesLatitude field, and / or a degreesLongitude field.

[0217] In some implementations, the time information associated with each of the reference locations may include at least one of an epoch time and / or a valid duration for each of the reference locations.

[0218] In some implementations, the epoch time of each of the reference positions may be provided / represented by an absolute time point (e.g., Coordinated Universal Time (UTC)). The absolute time point may inform when each of the reference positions becomes valid. The absolute time point may be determined by the same epochTime as described in Table 8 above. For example, the absolute time point may be determined based on the epochTime field, which informs the start time of the DL subframe indicated by the SFN and the subframe number. After the absolute time point, the wireless device may select a reference position from the set of reference positions.

[0219] In some implementations, the validity duration may be provided / represented by a relative time period (e.g., seconds, minutes, hours, days). The relative time period may inform how long each of the reference positions is valid. The relative time period may be determined by being equal to ntn-UlSyncValidityDuration / N, where ntn-UlSyncValidityDuration is described in Table 8 above. For example, the relative time period may be determined based on the value of the ntn-UlSyncValidityDuration field divided by the number of reference positions.

[0220] The wireless device selects a reference location associated with the current time from among the reference location set based on the time information.

[0221] In some implementations, the kth element in the set may be selected as the reference position based on the current time being greater than or equal to (epoch time + (k-1) * valid duration) and less than (epoch time + k * valid duration).

[0222] The wireless device determines whether to perform neighbor cell measurement based on i) the distance between the wireless device and the reference location and ii) the distance threshold. For example, once the wireless device selects a reference location from the reference location set, the wireless device can use the selected reference location for location-based measurement and mobility during a relative period.

[0223] In some implementations, a determination to perform neighbor cell measurements may be made based on a distance between the wireless device and the reference location being shorter than a distance threshold.

[0224] In some implementations, it may be determined not to perform neighbor cell measurements based on the distance between the wireless device and the reference location being not shorter than a distance threshold.

[0225] In addition, the above Fig. 9 The method described in the wireless device perspective can be controlled by Figure 2 The processor 102 in the first wireless device 100 shown in FIG. 1 and / or by controlling the Figure 3 The process is executed by the processor 102 in the UE 100 shown in FIG.

[0226] A processing device adapted to control a wireless device comprises at least one processor and at least one memory operatively connected to the at least one processor. The at least one processor is adapted to execute Fig. 9 The method described in .

[0227] In addition, the above Fig. 9 The method described in terms of the wireless device may be performed by storing a Figure 2The software code 105 in the memory 104 in the first wireless device 100 shown in FIG. 1 is executed.

[0228] The technical features of the present disclosure may be directly implemented in hardware, software executed by a processor, or a combination of the two. For example, a method performed by a wireless device in wireless communication may be implemented in hardware, software, firmware, or any combination thereof. For example, the software may reside in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, removable disk, CD-ROM, or any other storage medium.

[0229] Some examples of storage media can be coupled to a processor so that the processor can read information from the storage media. In an alternative, the storage media can be integrated into the processor. The processor and the storage media can reside in an ASIC. For other examples, the processor and the storage media can reside as discrete components.

[0230] The computer-readable medium may include tangible and non-transitory computer-readable storage media.

[0231] For example, non-transitory computer-readable media may include RAM, such as synchronous DRAM (SDRAM), ROM, non-volatile RAM (NVRAM), EEPROM, flash memory, magnetic or optical data storage media, or any other media that can be used to store instructions or data structures. Non-transitory computer-readable media may also include combinations of the foregoing.

[0232] Furthermore, the methods described herein may be implemented at least in part by a computer-readable communication medium that carries or communicates code in the form of instructions or data structures and can be accessed, read, and / or executed by a computer.

[0233] According to some embodiments of the present disclosure, a non-transitory computer readable medium (CRM) stores instructions that are executed by at least one processor. Fig. 9 The method described in .

[0234] Fig.10 An example of a method performed by a base station to which an embodiment of the present disclosure is applied is shown.

[0235] In step S1000, the method includes sending assistance information to a wireless device. The assistance information includes i) a reference position set and ii) time information associated with each of the reference positions. A reference position associated with a current time is selected from the reference position set based on the time information. Whether to perform neighbor cell measurement is determined based on i) a distance between the wireless device and the reference position and ii) a distance threshold.

[0236] In addition, the above Fig.10The method described in the above from the perspective of the base station serving the second cell may be implemented by Figure 2 The second wireless device 200 shown in FIG.

[0237] The base station includes at least one transceiver, at least one processor, and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions being executed based on the at least one processor. Fig.10 The method described in .

[0238] More specifically, the base station sends assistance information to the wireless device. The assistance information includes i) a reference position set and ii) time information related to each of the reference positions. A reference position related to the current time is selected from the reference position set based on the time information. Whether to perform neighbor cell measurement is determined based on i) a distance between the wireless device and the reference position and ii) a distance threshold.

[0239] The present disclosure may have various beneficial effects.

[0240] For example, when a geomobile serving cell serves the UE, the UE may obtain a reference position of the geomobile serving cell at a specific time.

[0241] For example, the UE may perform location-based measurements and CHO based on a reference location of an earth mobile serving cell.

[0242] The beneficial effects obtained by the specific examples of this specification are not limited to the effects listed above. For example, there may be a variety of technical effects that a person of ordinary skill in the art can understand or derive from this specification. Therefore, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that can be understood or derived from the technical features of the present disclosure.

[0243] The claims in this disclosure can be combined in various ways. For example, the technical features in the method claims of this disclosure can be combined to be implemented or performed in a device, and the technical features in the device claims can be combined to be implemented or performed in a method. In addition, the technical features in the method claims and the device claims can be combined to be implemented or performed in a device. In addition, the technical features in the method claims and the device claims can be combined to be implemented or performed in a method. Other implementations are within the scope of the appended claims.

Claims

1. A method performed by a wireless device adapted to operate in a wireless communication system, the method comprising: Receive assistance information from the serving cell, wherein the auxiliary information includes i) a set of reference positions and ii) time information associated with each of the reference positions; Selecting a reference position related to a current time from among the reference position set based on the time information; and Whether to perform neighbor cell measurement is determined based on i) a distance between the wireless device and the reference location and ii) a distance threshold.

2. The method according to claim 1, wherein: The serving cell is an earth mobile cell in a non-terrestrial network (NTN).

3. The method according to claim 2, wherein: The assistance information is received via system information including satellite information for the earth mobile cell.

4. The method according to any one of claims 1 to 3, wherein: The reference positions in the set are consecutive in time order.

5. The method according to any one of claims 1 to 4, wherein: Each of the reference locations includes at least one of a latitudeSign field, a degreesLatitude field, and / or a degreesLongitude field.

6. The method according to any one of claims 1 to 5, wherein: The time information associated with each of the reference positions includes at least one of an epoch time and / or a valid duration of each of the reference positions.

7. The method according to claim 6, wherein: The epoch time of each of the reference locations is represented by an absolute point in time.

8. The method according to claim 7, wherein: The absolute time point informs when each of the reference positions becomes valid.

9. The method according to claim 7 or 8, wherein: The absolute time point is determined based on an epochTime field that informs a start time of a downlink (DL) subframe indicated by a system frame number (SFN) and a subframe number.

10. The method according to any one of claims 6 to 9, wherein: The effective duration is represented by a relative time period.

11. The method according to claim 10, wherein: The relative time period informs how long each of the reference positions is valid.

12. The method according to claim 10 or 11, wherein: The relative time period is determined based on the value of the ntn-UlSyncValidityDuration field divided by the number of reference locations, Among them, the ntn-UlSyncValidityDuration field informs the valid duration configured by the network for uplink (UL) synchronization assistance information, and the valid duration indicates the maximum time for the wireless device to apply the assistance information without acquiring new assistance information.

13. The method according to any one of claims 1 to 12, wherein: Based on the current time being greater than or equal to (epoch time + (k-1) * valid duration) and less than (epoch time + k * valid duration), the kth element in the set is selected as the reference position.

14. The method according to any one of claims 1 to 14, wherein: Based on the distance between the wireless device and the reference location being shorter than the distance threshold, it is determined to perform the neighbor cell measurement.

15. The method according to any one of claims 1 to 15, wherein: Based on the distance between the wireless device and the reference location being not shorter than the distance threshold, it is determined not to perform the neighbor cell measurement.

16. The method according to any one of claims 1 to 15, wherein: The wireless device communicates with at least one of a mobile device other than the wireless device, a network, and / or an autonomous vehicle.

17. A wireless device adapted to operate in a wireless communication system, the wireless device comprising: at least one transceiver; at least one processor; as well as At least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions being executed by the at least one processor to perform the method according to any one of claims 1 to 16.

18. A processing device adapted to control a wireless device in a wireless communication system, the processing device comprising: at least one processor; as well as at least one memory operatively connectable to the at least one processor, Wherein, the at least one processor is adapted to perform the method according to any one of claims 1 to 16.

19. A non-transitory computer readable medium (CRM) storing instructions for executing, upon being executed by at least one processor, the method according to any one of claims 1 to 20.

20. A method performed by a base station adapted to operate in a wireless communication system, the method comprising: Sending assistance information to the wireless device, The auxiliary information includes i) a set of reference positions and ii) time information associated with each of the reference positions, wherein a reference position related to the current time is selected from the reference position set based on the time information, and Whether to perform neighbor cell measurement is determined based on i) a distance between the wireless device and the reference location and ii) a distance threshold.

21. A base station serving a second serving cell adapted to operate in a wireless communication system, the base station comprising: at least one transceiver; at least one processor; as well as At least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions performing the method according to claim 20 upon being executed by the at least one processor.

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