Measurement on non-terrestrial network frequency in wireless communications

Abstract

The present disclosure is related to measurement on non-terrestrial network (NTN) frequency in wireless communications. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) comprises performing a measurement on one or more inter-frequencies of which priority is equal to or lower than a serving frequency in a list of first type frequencies and not in a list of second type frequencies, based on i) a condition of inter-frequency measurement being satisfied, and ii) a condition of measuring second type frequency being not satisfied, where a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies.

Description

MEASUREMENT ON NON-TERRESTRIAL NETWORK FREQUENCY IN WIRELESS COMMUNICATIONS

[0001] The present disclosure is related to measurement on non-terrestrial network (NTN) frequency in wireless communications.

[0002] 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.

[0003] Work has started in International Telecommunication Union (ITU) and 3GPP to develop requirements and specifications for New Radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU Radio communication sector (ITU-R) International Mobile Telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.

[0004] The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), Ultra-Reliable and Low Latency Communications (URLLC), etc. The NR shall be inherently forward compatible.

[0005] In wireless communications, non-terrestrial network (NTN) is introduced. A user equipment (UE) in an idle / inactive mode may measure an NTN frequency while the UE is in a terrestrial network (TN) serving cell, and perform a cell reselection to a neighbor cell on the NTN frequency. Measurements rules on the NTN frequency for the cell reselection needs to be specified.

[0006] An aspect of the present disclosure is to provide method and apparatus for measurement on NTN frequency in a wireless communication system.

[0007] According to an embodiment of the present disclosure, a method performed by a user equipment (UE) comprises: obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency, wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies; obtaining a measurement value for a serving cell on a serving frequency; evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; and performing a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0008] According to an embodiment of the present disclosure, a method performed by a network node comprises: transmitting, to a user equipment (UE), information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency, wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies, wherein the UE is configured to perform operations comprising: obtaining a measurement value for a serving cell on a serving frequency; evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; and performing a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0009] According to various embodiments, apparatuses to implement the above methods are provided.

[0010] The present disclosure may have various advantageous effects.

[0011] For example, UE can maintain valid ephemeris of NTN neighbor cell prior to perform measurement on NTN frequency with proper UE power consumption.

[0012] Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and / or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

[0013] FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.

[0014] FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.

[0015] FIG. 3 shows an example of UE to which implementations of the present disclosure is applied.

[0016] FIGs. 4 and 5 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0017] FIG. 6 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0018] FIG. 7 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.

[0019] FIG. 8 shows an example of NTN according to an embodiment of the present disclosure.

[0020] FIG. 9 shows an example of a method performed by a UE for measurements on NTN frequency according to an embodiment of the present disclosure.

[0021] FIG. 10 shows an example of a signal flow between a UE and a network node for measurements on NTN frequency according to an embodiment of the present disclosure.

[0022] FIG. 11 shows an example of measurement rules for NTN frequency according to an embodiment of the present disclosure.

[0023] The following techniques, apparatuses, and systems may be applied to a variety of wireless multiple access systems. Examples of the multiple access systems include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and a Multi Carrier Frequency Division Multiple Access (MC-FDMA) system. CDMA may be embodied through radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be embodied through radio technology such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data rates for GSM Evolution (EDGE). OFDMA may be embodied through radio technology 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 a part of a 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 employs OFDMA in downlink (DL) and SC-FDMA in uplink (UL). Evolution of 3GPP LTE includes LTE-Advanced (LTE-A), LTE-A Pro, and / or 5G New Radio (NR).

[0024] For convenience of description, implementations of the present disclosure are mainly described in regards 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 3GPP based wireless communication system are applicable to other mobile communication systems.

[0025] For terms and technologies which are not specifically described among the terms of and technologies employed in the present disclosure, the wireless communication standard documents published before the present disclosure may be referenced.

[0026] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, "A or B" in the present disclosure may be interpreted as "A and / or B". For example, "A, B or C" in the present disclosure may mean "only A", "only B", "only C", or "any combination of A, B and C".

[0027] In the present disclosure, slash ( / ) or comma (,) may mean "and / or". For example, "A / B" may mean "A and / or B". Accordingly, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B or C".

[0028] 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 same as "at least one of A and B".

[0029] 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".

[0030] Also, parentheses 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, "control information" in the present disclosure is not limited to "PDCCH", and "PDCCH" may be proposed as an example of "control information". In addition, even when shown as "control information (i.e., PDCCH)", "PDCCH" may be proposed as an example of "control information".

[0031] Technical features that are separately described in one drawing in the present disclosure may be implemented separately or simultaneously.

[0032] Although not limited thereto, various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts of the present disclosure disclosed herein can be applied to various fields requiring wireless communication and / or connection (e.g., 5G) between devices.

[0033] Hereinafter, the present disclosure will be described in more detail with reference to drawings. 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 unless otherwise indicated.

[0034] FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.

[0035] The 5G usage scenarios shown in FIG. 1 are only exemplary, and the technical features of the present disclosure can be applied to other 5G usage scenarios which are not shown in FIG. 1.

[0036] Three main requirement categories for 5G include (1) a category of enhanced Mobile BroadBand (eMBB), (2) a category of massive Machine Type Communication (mMTC), and (3) a category of Ultra-Reliable and Low Latency Communications (URLLC).

[0037] Referring to FIG. 1, the communication system 1 includes wireless devices 100a to 100f, Base Stations (BSs) 200, and a network 300. Although FIG. 1 illustrates a 5G network as an example of the network of the communication system 1, the implementations of the present disclosure are not limited to the 5G system, and can be applied to the future communication system beyond the 5G system.

[0038] The BSs 200 and the network 300 may be implemented as wireless devices and a specific wireless device may operate as a BS / network node with respect to other wireless devices.

[0039] The wireless devices 100a to 100f represent devices performing communication using Radio Access Technology (RAT) (e.g., 5G NR or LTE) and may be referred to as communication / radio / 5G devices. The wireless devices 100a to 100f may include, without being limited to, a robot 100a, vehicles 100b-1 and 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an Internet-of-Things (IoT) device 100f, and an Artificial Intelligence (AI) device / server 400. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. The vehicles 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) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include a sensor and a smartmeter.

[0040] In the present disclosure, the wireless devices 100a to 100f may be called User Equipments (UEs). A UE may include, for example, a cellular phone, a smartphone, a laptop computer, a digital broadcast terminal, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a navigation system, a slate Personal Computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle having an autonomous traveling function, a connected car, an 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 / environment device, a device related to a 5G service, or a device related to a fourth industrial revolution field.

[0041] The wireless devices 100a to 100f may be connected to the network 300 via the BSs 200. An 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 beyond-5G network. Although the wireless devices 100a to 100f may communicate with each other through the BSs 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs 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). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0042] Wireless communication / connections 150a, 150b and 150c may be established between the wireless devices 100a to 100f and / or between wireless device 100a to 100f and BS 200 and / or between BSs 200. Herein, the wireless communication / connections 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. The wireless devices 100a to 100f and the BSs 200 / the wireless devices 100a to 100f may transmit / receive radio signals to / from each other through the wireless communication / connections 150a, 150b and 150c. For example, the wireless communication / connections 150a, 150b and 150c may transmit / receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / de-mapping), and resource allocating processes, for transmitting / receiving radio signals, may be performed based on the various proposals of the present disclosure.

[0043] NR supports multiples numerologies (and / or multiple Sub-Carrier Spacings (SCS)) to support various 5G services. For example, if SCS is 15 kHz, wide area can be supported in traditional cellular bands, and if SCS is 30 kHz / 60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. If SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.

[0044] The NR frequency band may be defined as two types of frequency range, i.e., Frequency Range 1 (FR1) and Frequency Range 2 (FR2). The numerical value of the frequency range may be changed. For example, the frequency ranges of the two types (FR1 and FR2) may be as shown in Table 1 below. For ease of explanation, in the frequency ranges used in the NR system, FR1 may mean "sub 6 GHz range", FR2 may mean "above 6 GHz range," and may be referred to as millimeter Wave (mmW).

[0045] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1450MHz - 6000MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0046] As mentioned above, the numerical value of the frequency range of the NR system may be changed. For example, FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. Unlicensed bands may be used for a variety of purposes, for example for communication for vehicles (e.g., autonomous driving).

[0047] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0048] Here, the radio communication technologies implemented in the wireless devices 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 Low Power Wide Area Network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the above-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and be called by various names such as enhanced MTC (eMTC). For example, LTE-M technology may be implemented in at least one of the 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-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN which take into account low-power communication, and may not be limited to the above-mentioned names. For example, ZigBee technology may generate Personal Area Networks (PANs) associated with small / low-power digital communication based on various specifications such as IEEE 802.15.4 and may be called various names.FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.

[0049] In FIG. 2, The first wireless device 100 and / or the second wireless device 200 may be implemented in various forms according to use cases / services. For example, {the first wireless device 100 and the second wireless device 200} may correspond to at least one of {the wireless device 100a to 100f and the BS 200}, {the wireless device 100a to 100f and the wireless device 100a to 100f} and / or {the BS 200 and the BS 200} of FIG. 1. The first wireless device 100 and / or the second wireless device 200 may be configured by various elements, devices / parts, and / or modules.

[0050] The first wireless device 100 may include at least one transceiver, such as a transceiver 106, at least one processing chip, such as a processing chip 101, and / or one or more antennas 108.

[0051] The processing chip 101 may include at least one processor, such a processor 102, and at least one memory, such as a memory 104. Additional and / or alternatively, the memory 104 may be placed outside of the processing chip 101.

[0052] The processor 102 may control the memory 104 and / or the transceiver 106 and may be adapted to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor 102 may process information within the memory 104 to generate first information / signals and then transmit radio signals including the first information / signals through the transceiver 106. The processor 102 may receive radio signals including second information / signals through the transceiver 106 and then store information obtained by processing the second information / signals in the memory 104.

[0053] The memory 104 may be operably connectable to the processor 102. The memory 104 may store various types of information and / or instructions. The memory 104 may store a firmware and / or a software code 105 which implements codes, commands, and / or a set of commands that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 105 may control the processor 102 to perform one or more protocols. For example, the firmware and / or the software code 105 may control the processor 102 to perform one or more layers of the radio interface protocol.

[0054] Herein, the processor 102 and the memory 104 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each of the transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be interchangeably used with Radio Frequency (RF) unit(s). In the present disclosure, the first wireless device 100 may represent a communication modem / circuit / chip.

[0055] The second wireless device 200 may include at least one transceiver, such as a transceiver 206, at least one processing chip, such as a processing chip 201, and / or one or more antennas 208.

[0056] The processing chip 201 may include at least one processor, such a processor 202, and at least one memory, such as a memory 204. Additional and / or alternatively, the memory 204 may be placed outside of the processing chip 201.

[0057] The processor 202 may control the memory 204 and / or the transceiver 206 and may be adapted to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor 202 may process information within the memory 204 to generate third information / signals and then transmit radio signals including the third information / signals through the transceiver 206. The processor 202 may receive radio signals including fourth information / signals through the transceiver 106 and then store information obtained by processing the fourth information / signals in the memory 204.

[0058] The memory 204 may be operably connectable to the processor 202. The memory 204 may store various types of information and / or instructions. The memory 204 may store a firmware and / or a software code 205 which implements codes, commands, and / or a set of commands that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 205 may control the processor 202 to perform one or more protocols. For example, the firmware and / or the software code 205 may control the processor 202 to perform one or more layers of the radio interface protocol.

[0059] Herein, the processor 202 and the memory 204 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each of the transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be interchangeably used with RF unit. In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0060] Hereinafter, hardware elements of the wireless devices 100 and 200 will be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as Physical (PHY) layer, Media 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). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs), one or more Service Data Unit (SDUs), messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure.

[0061] The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The 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 the one or more processors 102 and 202. For example, the one or more processors 102 and 202 may be configured by a set of a communication control processor, an Application Processor (AP), an Electronic Control Unit (ECU), a Central Processing Unit (CPU), a Graphic Processing Unit (GPU), and a memory control processor.

[0062] The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and / or commands. 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, non-volatile memory, hard drive, register, cash memory, computer-readable storage medium, and / or combinations thereof. The one or more memories 104 and 204 may be located at the interior and / or exterior of 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 connection.

[0063] The one or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, from one or more other devices. For example, the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.

[0064] The one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208. Additionally and / or alternatively, the one or more transceivers 106 and 206 may include one or more antennas 108 and 208. The 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, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, through the one or more antennas 108 and 208. In the present disclosure, the one or more antennas 108 and 208 may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

[0065] The one or more transceivers 106 and 206 may convert received user data, control information, radio signals / channels, etc., from RF band signals into baseband signals in order to process 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 the base band signals into the 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 can up-convert OFDM baseband signals to OFDM signals by 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 OFDM signals at a carrier frequency and down-convert the OFDM signals into OFDM baseband signals by their (analog) oscillators and / or filters under the control of the one or more processors 102 and 202.

[0066] Although not shown in FIG. 2, the wireless devices 100 and 200 may further include additional components. The additional components 140 may be variously configured according to types 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., audio I / O port, video I / O port), a driving 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 a wired or wireless connection.

[0067] In the implementations of the present disclosure, a UE may operate as a transmitting device in Uplink (UL) and as a receiving device in Downlink (DL). In the implementations of the present disclosure, a BS may operate as a receiving device in UL and as a transmitting device in DL. Hereinafter, for convenience of description, it is mainly assumed that the first wireless device 100 acts as the UE, and the second wireless device 200 acts as the BS. For example, the processor(s) 102 connected to, mounted on or launched in the first wireless device 100 may be adapted to perform the UE behavior according to an implementation of the present disclosure or control the transceiver(s) 106 to perform the UE behavior according to an implementation of the present disclosure. The processor(s) 202 connected to, mounted on or launched in the second wireless device 200 may be adapted to perform the BS behavior according to an implementation of the present disclosure or control the transceiver(s) 206 to perform the BS behavior according to an implementation of the present disclosure.

[0068] In the present disclosure, a BS is also referred to as a node B (NB), an eNode B (eNB), or a gNB.

[0069] FIG. 3 shows an example of UE to which implementations of the present disclosure is applied.

[0070] Referring to FIG. 3, a UE 100 may correspond to the first wireless device 100 of FIG. 2.

[0071] A 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 Identification Module (SIM) card 145, a speaker 146, and a microphone 147.

[0072] The processor 102 may be adapted to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The processor 102 may be adapted to control one or more other components of the UE 100 to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. Layers of the radio interface protocol may be implemented in the processor 102. The processor 102 may include ASIC, other chipset, logic circuit and / or data processing device. The processor 102 may be an application processor. The processor 102 may include at least one of DSP, CPU, GPU, a modem (modulator and demodulator). An example of the processor 102 may be found in SNAPDRAGONTMseries of processors made by Qualcomm®, EXYNOSTMseries of processors made by Samsung®, A series of processors made by Apple®, HELIOTMseries of processors made by MediaTek®, ATOMTMseries of processors made by Intel®or a corresponding next generation processor.

[0073] The memory 104 is operatively coupled with 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 device. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, etc.) that perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts 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 external to the processor 102 in which case those can be communicatively coupled to the processor 102 via various means as is known in the art.

[0074] The transceiver 106 is operatively coupled with the processor 102, and transmits and / or receives a radio signal. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include baseband circuitry to process radio frequency signals. The transceiver 106 controls the one or more antennas 108 to transmit and / or receive a radio signal.

[0075] The power management module 141 manages power for the processor 102 and / or the transceiver 106. The battery 142 supplies power to the power management module 141.

[0076] The display 143 outputs results processed by the processor 102. The keypad 144 receives inputs to be used by the processor 102. The keypad 144 may be shown on the display 143.

[0077] The SIM card 145 is an　integrated circuit　that is intended to　securely store the　International Mobile Subscriber Identity　(IMSI) number and its related　key, which are used to identify and authenticate subscribers on　mobile telephony　devices (such as　mobile phones　and　computers). It is also possible to store contact information on many SIM cards.

[0078] The speaker 146 outputs sound-related results processed by the processor 102. The microphone 147 receives sound-related inputs to be used by the processor 102.

[0079] FIGs. 4 and 5 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0080] In particular, FIG. 4 illustrates an example of a radio interface user plane protocol stack between a UE and a BS and FIG. 5 illustrates an example of a radio interface control plane protocol stack between a UE and a BS. The control plane refers to a path through which control messages used to manage call by a UE and a network are transported. The user plane refers to a path through which data generated in an application layer, for example, voice data or Internet packet data are transported. Referring to FIG. 4, the user plane protocol stack may be divided into Layer 1 (L1, for example PHY layer) and Layer 2 (L2, for example MAC / RLC / PDCP layer). Referring to FIG. 5, the control plane protocol stack may be divided into Layer 1 (L1, for example PHY layer), Layer 2 (L2, for example MAC / RLC / PDCP layer), Layer 3 (L3, for example an RRC layer), and a non-access stratum (NAS) layer. Layer 1, Layer 2 and Layer 3 are referred to as an access stratum (AS).

[0081] In the 3GPP LTE system, the Layer 2 is split into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, the Layer 2 is split into the following sublayers: MAC, RLC, PDCP and SDAP. The PHY layer offers to the MAC sublayer transport channels, the MAC sublayer offers to the RLC sublayer logical channels, the RLC sublayer offers to the PDCP sublayer RLC channels, the PDCP sublayer offers to the SDAP sublayer radio bearers. The SDAP sublayer offers to 5G core network quality of service (QoS) flows.

[0082] In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing / de-multiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels; scheduling information reporting; error correction through hybrid automatic repeat request (HARQ) (one HARQ entity per cell in case of carrier aggregation (CA)); priority handling between UEs by means of dynamic scheduling; priority handling between logical channels of one UE by means of logical channel prioritization; padding. A single MAC entity may support multiple numerologies, transmission timings and cells. Mapping restrictions in logical channel prioritization control which numerology(ies), cell(s), and transmission timing(s) a logical channel can use.

[0083] Different kinds of data transfer services are offered by MAC. To accommodate different kinds of data transfer services, multiple types of logical channels are defined, i.e., each supporting transfer of a particular type of information. Each logical channel type is defined by what type of information is transferred. Logical channels are classified into two groups: control channels and traffic channels. Control channels are used for the transfer of control plane information only, and traffic channels are used for the transfer of user plane information only. Broadcast control channel (BCCH) is a downlink logical channel for broadcasting system control information, paging control channel (PCCH) is a downlink logical channel that transfers paging information, system information change notifications and indications of ongoing public warning service (PWS) broadcasts, common control channel (CCCH) is a logical channel for transmitting control information between UEs and network and used for UEs having no RRC connection with the network, and dedicated control channel (DCCH) is a point-to-point bi-directional logical channel that transmits dedicated control information between a UE and the network and used by UEs having an RRC connection. Dedicated traffic channel (DTCH) is a point-to-point logical channel, dedicated to one UE, for the transfer of user information. A DTCH can exist in both uplink and downlink. In downlink, the following connections between logical channels and transport channels exist: BCCH can be mapped to broadcast channel (BCH); BCCH can be mapped to downlink shared channel (DL-SCH); PCCH can be mapped to 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 uplink, the following connections between logical channels and transport channels exist: CCCH can be mapped to uplink shared channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0084] The RLC sublayer supports three transmission modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged node (AM). The RLC configuration is per logical channel with no dependency on numerologies and / or transmission durations. In the 3GPP NR system, the main services and functions of the RLC sublayer depend on the transmission mode and include: transfer of upper layer PDUs; sequence numbering independent of the one 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 SDU (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

[0085] 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); transfer of user data; reordering and duplicate detection; in-order delivery; PDCP PDU routing (in case of split bearers); retransmission of PDCP SDUs; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; duplication of PDCP PDUs 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; transfer of control plane data; reordering and duplicate detection; in-order delivery; duplication of PDCP PDUs and duplicate discard indication to lower layers.

[0086] In the 3GPP NR system, the main services and functions of SDAP include: mapping between a QoS flow and a data radio bearer; marking QoS flow ID (QFI) in both DL and UL packets. A single protocol entity of SDAP is configured for each individual PDU session.

[0087] 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 5GC or NG-RAN; establishment, maintenance and release of an RRC connection between the UE and 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 the reporting; detection of and recovery from radio link failure; NAS message transfer to / from NAS from / to UE.

[0088] FIG. 6 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0089] The frame structure shown in FIG. 6 is purely exemplary and the number of subframes, the number of slots, and / or the number of symbols in a frame may be variously changed. In the 3GPP based wireless communication system, OFDM numerologies (e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration) may be differently configured between a plurality of cells aggregated for one UE. For example, if a UE is configured with different SCSs for cells aggregated for the cell, an (absolute time) duration of a time resource (e.g., a subframe, a slot, or a TTI) including the same number of symbols may be different among the aggregated cells. Herein, symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols).

[0090] Referring to FIG. 6, downlink and uplink transmissions are organized into frames. Each frame has Tf= 10ms duration. Each frame is divided into two half-frames, where each of the half-frames has 5ms duration. Each half-frame consists of 5 subframes, where the duration Tsfper subframe is 1ms. Each subframe is divided into slots and the number of slots in a subframe depends on a subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a cyclic prefix (CP). In a normal CP, each slot includes 14 OFDM symbols and, in an extended CP, each slot includes 12 OFDM symbols. The numerology is based on exponentially scalable subcarrier spacing βf = 2u*15 kHz.

[0091] Table 3 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the normal CP, according to the subcarrier spacing βf = 2u*15 kHz.

[0092] uNslotsymbNframe,uslotNsubframe,uslot01410111420221440431480841416016

[0093] Table 4 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the extended CP, according to the subcarrier spacing βf = 2u*15 kHz.

[0094] uNslotsymbNframe,uslotNsubframe,uslot212404

[0095] A slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain. For each numerology (e.g., subcarrier spacing) and carrier, a resource grid ofNsize,ugrid,x*NRBscsubcarriers andNsubframe,usymbOFDM symbols is defined, starting at common resource block (CRB)Nstart,ugridindicated by higher-layer signaling (e.g., RRC signaling), whereNsize,ugrid,xis the number of resource blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink.NRBscis the number of subcarriers per RB. In the 3GPP based wireless communication system,NRBscis 12 generally. There is one resource grid for a given antenna portp, subcarrier spacing configurationu, and transmission direction (DL or UL). The carrier bandwidthNsize,ugridfor subcarrier spacing configurationuis given by the higher-layer parameter (e.g., RRC parameter). Each element in the resource grid for the antenna portpand the subcarrier spacing configurationuis referred to as a resource element (RE) and one complex symbol may be mapped to each RE. Each RE in the resource grid is uniquely identified by an indexkin the frequency domain and an indexlrepresenting a symbol location relative to a reference point in the time domain. In the 3GPP based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain. As shown in FIG. 6, as SCS doubles, the slot length and symbol length are halved. For example, when SCS is 15kHz, the slot length is 1ms, which is the same as the subframe length. When SCS is 30kHz, the slot length is 0.5ms (=500us), and the symbol length is half of that when the SCS is 15kHz. When SCS is 60kHz, the slot length is 0.25ms (=250us), and the symbol length is half of that when the SCS is 30kHz. When SCS is 120kHz, the slot length is 0.125ms (=125us), and the symbol length is half of that when the SCS is 60kHz. When SCS is 240kHz, the slot length is 0.0625ms (=62.5us), and the symbol length is half of that when the SCS is 120kHz.

[0096] In the 3GPP NR system, RBs are classified into CRBs and physical resource blocks (PRBs). CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configurationu. The center of subcarrier 0 of CRB 0 for subcarrier spacing configurationucoincides with 'point A' which serves as a common reference point for resource block grids. In the 3GPP NR system, PRBs are defined within a bandwidth part (BWP) and numbered from 0 toNsizeBWP,i-1, where i is the number of the bandwidth part. The relation between the physical resource block nPRBin the bandwidth part i and the common resource block nCRBis as follows: nPRB= nCRB+NsizeBWP,i, whereNsizeBWP,iis the common resource block where bandwidth part starts relative to CRB 0. The BWP includes a plurality of consecutive RBs. A carrier may include a maximum of N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Only one BWP among BWPs configured to the UE can active at a time. The active BWP defines the UE's operating bandwidth within the cell's operating bandwidth.

[0097] In the present disclosure, the term "cell" may refer to a geographic area to which one or more nodes provide a communication system, or refer to radio resources. A "cell" as a geographic area may be understood as coverage within which a node can provide service using a carrier and a "cell" as radio resources (e.g., time-frequency resources) is associated with bandwidth which is a frequency range configured by the carrier. The "cell" associated with the radio resources is defined by a combination of downlink resources and uplink resources, for example, a combination of a DL component carrier (CC) and a UL CC. The cell may be configured by downlink resources only, or may be configured by downlink resources and uplink resources. Since DL coverage, which is a range within which the node is capable of transmitting a valid signal, and UL coverage, which is a range within which the node is capable of receiving the valid signal from the UE, depends upon a carrier carrying the signal, the coverage of the node may be associated with coverage of the "cell" of radio resources used by the node. Accordingly, the term "cell" may be used to represent service coverage of the node sometimes, radio resources at other times, or a range that signals using the radio resources can reach with valid strength at other times.

[0098] In CA, two or more CCs are aggregated. A UE may simultaneously receive or transmit on one or multiple CCs depending on its capabilities. CA is supported for both contiguous and non-contiguous CCs. When CA is configured, the UE only has one RRC connection with the network. At RRC connection establishment / re-establishment / handover, one serving cell provides the NAS mobility information, and at RRC connection re-establishment / handover, one serving cell provides the security input. This cell is referred to as the primary cell (PCell). The PCell is a cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure. Depending on UE capabilities, secondary cells (SCells) can be configured to form together with the PCell a set of serving cells. An SCell is a cell providing additional radio resources on top of special cell (SpCell). The configured set of serving cells for a UE therefore always consists of one PCell and one or more SCells. For dual connectivity (DC) operation, the term SpCell refers to the PCell of the master cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG). An SpCell supports PUCCH transmission and contention-based random access, and is always activated. The MCG is a group of serving cells associated with a master node, comprised of the SpCell (PCell) and optionally one or more SCells. The SCG is the subset of serving cells associated with a secondary node, comprised of the PSCell and zero or more SCells, for a UE configured with DC. For a UE in RRC_CONNECTED not configured with CA / DC, there is only one serving cell comprised of the PCell. For a UE in RRC_CONNECTED configured with CA / DC, the term "serving cells" is used to denote the set of cells comprised of the SpCell(s) and all SCells. In DC, two MAC entities are configured in a UE: one for the MCG and one for the SCG.

[0099] FIG. 7 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.

[0100] Referring to FIG. 7, "RB" denotes a radio bearer, and "H" denotes a header. Radio bearers are categorized into two groups: DRBs for user plane data and SRBs for control plane data. The MAC PDU is transmitted / received using radio resources through the PHY layer to / from an external device. The MAC PDU arrives to the PHY layer in the form of a transport block.

[0101] In the PHY layer, the uplink transport channels UL-SCH and random access channel (RACH) are mapped to their physical channels physical uplink shared channel (PUSCH) and physical random access channel (PRACH), respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to physical downlink shared channel (PDSCH), physical broadcast channel (PBCH) and PDSCH, respectively. In the PHY layer, uplink control information (UCI) is mapped to physical uplink control channel (PUCCH), and downlink control information (DCI) is mapped to physical downlink control channel (PDCCH). A MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant, and a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.

[0102] Hereinafter, non-terrestrial network (NTN) is described.

[0103] An NTN may be a radio access network (RAN) consisting of gNBs, which provide non-terrestrial (NR) access to UEs by means of an NTN payload embarked on an airborne or space-borne NTN vehicle (e.g., satellite orbiting the Earth) and an NTN gateway.

[0104] FIG. 8 shows an example of NTN according to an embodiment of the present disclosure.

[0105] Referring to FIG. 8, a service link and a feeder link are depicted. The service link may be a wireless link between the NTN payload and UE, and the feeder link may be a wireless link between the NTN gateway and the NTN payload.

[0106] The NTN payload may be a network node, embarked on board a satellite or high-altitude platform station, providing connectivity functions, between the service link and the feeder link. The NTN payload may be a transport network layer (TNL) node.

[0107] The NTN gateway may be an earth station located at the surface of the earth, providing connectivity to the NTN payload using the feeder link. An NTN gateway may be a TNL node.

[0108] The NTN payload transparently forwards the radio protocol (e.g., data / control information) received from the UE (via the service link) to the NTN gateway (via the feeder link). The NTN payload transparently forwards the radio protocol (e.g., data / control information) received from the NTN gateway (via the feeder link) to the UE (via the service link).

[0109] The following connectivity is supported by the NTN payload:

[0110] - An NTN gateway may serve multiple NTN payloads; and / or

[0111] - An NTN payload may be served by multiple NTN gateways.

[0112] The NTN payload may change the carrier frequency, before re-transmitting the radio protocol (e.g., data / control information) on the service link, and vice versa (respectively on the feeder link).

[0113] For NTN, the following applies in addition to network identities:

[0114] - A tracking area corresponds to a fixed geographical area. Any respective mapping is configured in the RAN; and / or

[0115] - A mapped cell ID.

[0116] NTN can be deployed to provide coverage with earth-moving cell, quasi-earth-fixed cell and earth-fixed cell.

[0117] The Earth-fixed cell may be an NTN cell fixed with respect to a certain geographic area on Earth. It can be provisioned by beam(s) continuously covering the same geographical area (e.g., the case of geosynchronous orbit (GSO) satellites).

[0118] The Earth-moving cell may be an NTN cell moving on the ground. It can be provisioned by beam(s) whose coverage area slides over the Earth's surface (e.g., the case of non-GSO (NGSO) satellites generating fixed or non-steerable beams).

[0119] The quasi-Earth-fixed cell may be an NTN cell fixed with respect to a certain geographic area on Earth during a certain time duration. It can be provisioned by beam(s) covering one geographic area for a limited period and a different geographic area during another period (e.g., the case of NGSO satellites generating steerable beams).

[0120] With NGSO satellites, the gNB can provide either quasi-Earth-fixed service link or Earth-moving service link, while gNB operating with GSO satellite can provide Earth fixed service link or quasi-Earth-fixed service link.

[0121] The UE supporting NTN may be global navigation satellite system (GNSS)-capable.

[0122] In NTN, the distance may refer to Euclidean distance.

[0123] For mobility in RRC_IDLE and RRC_INACTIVE, the network may broadcast multiple tracking area codes (TACs) per PLMN in an NR NTN cell. A TAC change in the system information is under network control, i.e., it may not be exactly synchronized with real-time illumination of beams on ground.

[0124] For the NTN-TN mobility, the network may broadcast cell information on NR TN and EUTRA TN coverage areas in system information block (SIB) 25. This is supported for Earth-Fixed, Quasi-Earth-fixed and Earth-Moving cells. The coverage information consists in a list of geographical TN areas, with associated frequency information also indicated. UE can skip TN measurement based on the broadcast TN coverage information.

[0125] The UE can determine the network type (terrestrial or non-terrestrial) implicitly by the existence ofcellBarredNTNin SIB1.

[0126] The NTN ephemeris is provided in SIB19. In an NTN cell, it includes serving cell's NTN payload ephemeris and optionally neighbouring cell's NTN payload ephemeris.

[0127] The SIB19 may contain satellite assistance information for NTN access, as shown in table 5:

[0128] SIB19-r17 ::= SEQUENCE {ntn-Config-r17 NTN-Config-r17 OPTIONAL, -- Need Rt-Service-r17 INTEGER (0..549755813887) OPTIONAL, -- Need RreferenceLocation-r17 ReferenceLocation-r17 OPTIONAL, -- Need RdistanceThresh-r17 INTEGER(0..65525) OPTIONAL, -- Need Rntn-NeighCellConfigList-r17 NTN-NeighCellConfigList-r17 OPTIONAL, -- Need RlateNonCriticalExtension OCTET STRING OPTIONAL,...,[[ntn-NeighCellConfigListExt-v1720 NTN-NeighCellConfigList-r17 OPTIONAL -- Need R]],[[movingReferenceLocation-r18 ReferenceLocation-r17 OPTIONAL, -- Need RntnCovEnh-r18 NTN-CovEnh-r18 OPTIONAL, -- Need RsatSwitchWithReSync-r18 SatSwitchWithReSync-r18 OPTIONAL -- Need R]]}NTN-NeighCellConfigList-r17 ::= SEQUENCE (SIZE(1..maxCellNTN-r17)) OF NTN-NeighCellConfig-r17NTN-NeighCellConfig-r17 ::= SEQUENCE {ntn-Config-r17 NTN-Config-r17 OPTIONAL, -- Need RcarrierFreq-r17 ARFCN-ValueNR OPTIONAL, -- Need RphysCellId-r17 PhysCellId OPTIONAL -- Need R}NTN-CovEnh-r18 ::= SEQUENCE {numberOfMsg4HARQ-ACK-Repetitions-r18 BIT STRING (SIZE(4)),rsrp-ThresholdMsg4HARQ-ACK-r18 RSRP-Range OPTIONAL -- Need R}SatSwitchWithReSync-r18 ::= SEQUENCE {ntn-Config-r18 NTN-Config-r17,t-ServiceStart-r18 INTEGER (0..549755813887) OPTIONAL, -- Need Rssb-TimeOffset-r18 INTEGER (0..159) OPTIONAL -- Need R}

[0129] In table 5:-distanceThresh: Distance from the serving cell reference location and is used in location-based measurement initiation in RRC_IDLE and RRC_INACTIVE. Each step represents 50m. This field is only present in an NTN cell.

[0130] -movingReferenceLocation: Reference location of the serving cell of an NTN Earth-moving cell at a time reference. It is used in the evaluation of eventD2 and condEventD2 criteria for the serving cell in RRC_CONNECTED, and location-based measurement initiation in RRC_IDLE and RRC_INACTIVE whendistanceThreshis also configured. The time reference of this field is indicated byepochTimeinntn-Configof the serving cell. This field is excluded when determining changes in system information, i.e., changes tomovingReferenceLocationshould neither result in system information change notifications nor in a modification ofvalueTagin SIB1. This field is only present in an NTN cell.

[0131] -ntn-Config: Provides parameters needed for the UE to access NR via NTN access such as Ephemeris data, common TA parameters, k_offset, validity duration for UL sync information and epoch time. In a TN cell, this field is only present inntn-NeighCellConfigListandntn-NeighCellConfigListExt.

[0132] -ntn-NeighCellConfigList, ntn-NeighCellConfigListExt: Provides a list of NTN neighbour cells including theirntn-Config, carrier frequency andPhysCellId. This set includes all elements ofntn-NeighCellConfigListand all elements ofntn-NeighCellConfigListExt. Ifntn-Configis absent for an entry inntn-NeighCellConfigListExt, thentn-Configprovided in the entry at the same position inntn-NeighCellConfigListapplies. Network providesntn-Configfor the first entry ofntn-NeighCellConfigList. If thentn-Configis absent for any other entry inntn-NeighCellConfigList, thentn-Configprovided in the previous entry inntn-NeighCellConfigListapplies.

[0133] -referenceLocation: Reference location of the serving cell provided via NTN (quasi)-Earth fixed cell and is used in location-based measurement initiation in RRC_IDLE and RRC_INACTIVE. This field is only present in an NTN cell.

[0134] -satSwitchWithReSync: Provides parameters for the target satellite required to perform satellite switch with resynchronization. This field is only present in an NTN cell and its presence indicates that satellite switch without PCI change is supported in the cell.

[0135] -t-Service: Indicates the time information on when a cell provided via NTN is going to stop serving the area it is currently covering. This field applies for both service link switches in NTN quasi-Earth fixed cell and feeder link switches for both NTN quasi-Earth fixed and Earth-moving cell. The field indicates a time in multiples of 10 ms after 00:00:00 on Gregorian calendar date 1 January, 1900 (midnight between Sunday, December 31, 1899 and Monday, January 1, 1900). 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. The reference point fort-Serviceis the uplink time synchronization reference point of the cell. This field is only present in an NTN cell.

[0136] -numberOfMsg4HARQ-ACK-Repetitions: The number of repetition slots for PUCCH transmission with HARQ-ACK information for Msg4. The first / leftmost bit corresponds to the repetition factor 1, the second bit corresponds to repetition factor 2, the third bit corresponds to the repetition factor 4, and the last / rightmost bit corresponds to the repetition factor 8. The repetition factor 1 shall be indicated together with at least one other repetition factor.

[0137] -rsrp-ThresholdMsg4HARQ-ACK: This threshold is used by the UE for determining the configuration of the MAC entity for PUCCH repetition for Msg4 HARQ-ACK.

[0138] -ssb-TimeOffset: Indicates the time offset of the SSB from target satellite at its uplink time synchronization reference point with respect to the SSB from source satellite at its uplink time synchronization reference point. It is given in number of subframes.

[0139] -t-ServiceStart: Indicates the time information on when the target satellite is going to start serving the area currently covered by the serving satellite. The field indicates a time in multiples of 10 ms after 00:00:00 on Gregorian calendar date 1st January 1900 (midnight between Sunday, December 31, 1899, and Monday, January 1, 1900). The exact start time is between the time indicated by the value of this field minus 1 and the time indicated by the value of this field. The reference point fort-ServiceStartis the uplink time synchronization reference point of the serving satellite.

[0140] TheNTN-Configprovides parameters needed for the UE to access NR via NTN access, as shown in table 6:

[0141] NTN-Config-r17 ::= SEQUENCE {epochTime-r17 EpochTime-r17 OPTIONAL, -- Need Rntn-UlSyncValidityDuration-r17 ENUMERATED{ s5, s10, s15, s20, s25, s30, s35,s40, s45, s50, s55, s60, s120, s180, s240, s900} OPTIONAL, -- Cond SIB19cellSpecificKoffset-r17 INTEGER(1..1023) OPTIONAL, -- Need Rkmac-r17 INTEGER(1..512) OPTIONAL, -- Need Rta-Info-r17 TA-Info-r17 OPTIONAL, -- Need Rntn-PolarizationDL-r17 ENUMERATED {rhcp,lhcp,linear} OPTIONAL, -- Need Rntn-PolarizationUL-r17 ENUMERATED {rhcp,lhcp,linear} OPTIONAL, -- Need RephemerisInfo-r17 EphemerisInfo-r17 OPTIONAL, -- Need Rta-Report-r17 ENUMERATED {enabled}...}TA-Info-r17 ::= SEQUENCE {ta-Common-r17 INTEGER(0..66485757),ta-CommonDrift-r17 INTEGER(-257303..257303) OPTIONAL, -- Need Rta-CommonDriftVariant-r17 INTEGER(0..28949) OPTIONAL -- Need R}

[0142] In table 6:-ephemerisInfo: This field provides satellite ephemeris either in format of position and velocity state vector or in format of orbital parameters. This field is excluded when determining changes in system information, i.e., changes toephemerisInfoshould neither result in system information change notifications nor in a modification ofvalueTagin SIB1.

[0143] -epochTime: If this field is absent for the NTN serving cell, the epoch time is the end of SI window where this SIB19 is scheduled. This field is mandatory present whenntn-Configis provided in dedicated configuration. If this field is absent inntn-Configprovided viaNTN-NeighCellConfigorSatSwitchWithReSyncin an NTN cell, the UE uses epoch time of the serving cell, otherwise the field is based on the timing of the serving cell, i.e., the SFN and sub-frame number indicated in this field refers to the SFN and sub-frame of the serving cell. If this field is absent inntn-Configprovided viaNTN-NeighCellConfigin a TN cell, the epoch time is the end of SI window where this SIB19 is scheduled. In case of satellite switch with resynchronization, this field is based on the timing of the cell served by the source satellite. This field is excluded when determining changes in system information, i.e., changes toepochTimeshould neither result in system information change notifications nor in a modification ofvalueTagin SIB1.

[0144] -cellSpecificKoffset: Scheduling offset used for the timing relationships that are modified for NTN. The unit of the fieldK_offsetis number of slots for a given subcarrier spacing of 15 kHz. If the field is absent UE assumes value 0.

[0145] -kmac: scheduling offset provided by network if downlink and uplink frame timing are not aligned at gNB. If the field is absent UE assumes value 0. The unit ofkmacis number of slots for a given subcarrier spacing of 15 kHz.

[0146] -ntn-PolarizationDL: If present, this parameter indicates polarization information for downlink transmission on service link: including Right hand, Left hand circular polarizations (RHCP, LHCP) and linear polarization.

[0147] -ntn-PolarizationUL: If present, this parameter indicates polarization information for uplink service link. If not present andntn-PolarizationDLis present, UE assumes the same polarization for UL and DL.

[0148] -ntn-UlSyncValidityDuration: a validity duration configured by the network for assistance information (i.e., serving and / or neighbour satellite ephemeris and common TA parameters) which indicates the maximum time duration (from epochTime) during which the UE can apply assistance information without having acquired new assistance information. The unit ofntn-UlSyncValidityDurationis second. Value s5 corresponds to 5s, value s10 indicate 10s and so on. If this field is absent inntn-Configprovided viaNTN-NeighCellConfigorSatSwitchWithReSyncin an NTN cell, the UE uses validity duration from the serving cell assistance information. If this field is absent inntn-Configprovided viaNTN-NeighCellConfigin a TN cell, how the UE sets the validity duration is left to UE implementation. This field is excluded when determining changes in system information, i.e., changes ofntn-UlSyncValidityDurationshould neither result in system information change notifications nor in a modification ofvalueTagin SIB1.ntn-UlSyncValidityDurationis only updated when at least one ofepochTime,ta-Info,ephemerisInfois updated.

[0149] -ta-Common: Network-controlled common timing advanced value and it may include any timing offset considered necessary by the network.ta-Commonwith value of 0 is supported. The granularity ofta-Commonis 4.072 Х 10^(-3) micro-seconds. Values are given in unit of corresponding granularity. This field is excluded when determining changes in system information, i.e., changes ofta-Commonshould neither result in system information change notifications nor in a modification ofvalueTagin SIB1.

[0150] -ta-CommonDrift: indicate drift rate of the common TA. The granularity of ta-CommonDrift is 0.2 Х 10^(-3) micro-seconds / s. Values are given in unit of corresponding granularity. This field is excluded when determining changes in system information, i.e., changes ofta-CommonDriftshould neither result in system information change notifications nor in a modification ofvalueTagin SIB1.

[0151] -ta-CommonDriftVariant: Indicate drift rate variation of the common TA. The granularity of ta-CommonDriftVariant is 0.2Х10^(-4) micro-seconds / s^2. Values are given in unit of corresponding granularity. This field is excluded when determining changes in system information, i.e., changes ofta-CommonDriftVariantshould neither result in system information change notifications nor in a modification ofvalueTagin SIB1.

[0152] -ta-Report: When this field is included in SIB19, it indicates reporting of timing advanced is enabled during Random Access due to RRC connection establishment or RRC connection resume, and during RRC connection reestablishment. When this field is included inServingCellConfigCommonwithin dedicated signalling, it indicates TA reporting is enabled during reconfiguration with sync.

[0153] For measurements, the network can configure:

[0154] - multiple SMTCs in parallel per carrier and for a given set of cells depending on UE capabilities;

[0155] - measurement gaps based on multiple SMTCs; and / or

[0156] - assistance information (e.g., ephemeris information (e.g.,ephemerisInfo), common TA parameters (e.g.,ta-Common / ta-CommonDrift / ta-CommonDriftVariant,kmac) provided in SIB19 for UE to perform measurement on neighbour cells in RRC_IDLE / RRC_INACTIVE / RRC_CONNECTED.

[0157] NW-controlled adjustment of SMTCs can be based on UE assistance information reported in RRC_CONNECTED. A UE in RRC_IDLE / RRC_INACTIVE can adjust SMTCs based on its location and assistance information in SIB19.

[0158] UE assistance information consists of the service link propagation delay difference(s) between serving the cell and neighbour cell(s).

[0159] For a UE in idle / inactive mode, it is up to UE implementation whether to perform NTN neighbour cell measurements on a cell indicated in SIB3 / SIB4 but not included in SIB19.

[0160] For a UE in connected mode, it is up to UE implementation whether to perform NTN neighbour cell measurements on a cell included in the measurement configuration, but without corresponding satellite information in measurement configuration or in SIB19.

[0161] UE can perform time-based and location-based measurements on neighbour cells in RRC_IDLE / RRC_INACTIVE:

[0162] - The timing and location information associated to the serving cell is provided in SIB19;

[0163] - Timing information refers to the UTC time when the serving cell stops serving the current geographical area;

[0164] - Location information refers: i) In the quasi-Earth fixed cell scenario, to the reference location (e.g.,referenceLocation) of the serving cell and a distance threshold (e.g.,distanceThresh) to the reference location; and / or ii) In the Earth moving cell scenario, to the reference location (e.g.,referenceLocation) of the serving cell at the epoch time (e.g.,epochTime) and a distance threshold (e.g.,distanceThresh) to the reference location.

[0165] The time-based measurement initiation may be applicable for the feeder link switchover case for cell (re)selection.

[0166] Measurement rules for cell re-selection based on timing information and location information are specified below.

[0167] For reselection priorities handling, absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in theRRCReleasemessage, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e., the fieldcellReselectionPriorityis absent for that frequency). If any fields withcellReselectionPriorityornsag-CellReselectionPriorityare provided in dedicated signalling, the UE shall ignore any fields withcellReselectionPriorityandnsag-CellReselectionPriorityprovided in system information.

[0168] When UE is in camped normally state, if it supports slice-based cell reselection and has received the network slice(s) and NSAG information from NAS to be used for cell reselection, UE shall derive reselection priorities.

[0169] UE derives reselection priorities for slice-based cell reselection also in caseSIB16is not broadcast in the camped cell.

[0170] If UE is incamped on any cellstate, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling anddeprioritisationReqreceived inRRCReleaseunless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e., lower than any of the network configured values). When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e., higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e., lower than any other network configured priorities). If the UE is configured to perform both NR sidelink communication and V2X sidelink communication, the UE may consider the frequency providing both NR sidelink communication configuration and V2X sidelink communication configuration to be the highest priority. If the UE is configured to perform NR sidelink communication and not perform V2X communication, the UE may consider the frequency providing NR sidelink communication configuration to be the highest priority. If the UE is configured to perform V2X sidelink communication and not perform NR sidelink communication, the UE may consider the frequency providing V2X sidelink communication configuration to be the highest priority. If the UE is configured to perform ranging / sidelink positioning, the UE may consider the frequency providing ranging / sidelink positioning configuration to be the highest priority.

[0171] A UE on a vehicle with a mobile-IAB cell may consider the frequency for which a mobile-IAB cell is the best cell to be the highest priority. The UE identifies a mobile-IAB cell bymobileIAB-Cellin SIB1. The UE may narrow its search scope for mobile-IAB cell(s) bymobileIAB-CellListif broadcasted in SIB4. A non-mobile-IAB cell may be excluded from this mobile IAB frequency prioritization for up to 300 seconds. NOTE 0a: The frequency only providing the anchor frequency configuration should not be prioritized for V2X service during cell reselection.

[0172] When UE is configured to perform NR sidelink communication or V2X sidelink communication performs cell reselection, it may consider the frequencies providing the intra-carrier and inter-carrier configuration have equal priority in cell reselection.

[0173] The prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation unless otherwise stated.

[0174] The UE is configured to perform V2X sidelink communication or NR sidelink communication, if it has the capability and is authorized for the corresponding sidelink operation.

[0175] When UE is configured to perform both NR sidelink communication and V2X sidelink communication, but cannot find a frequency which can provide both NR sidelink communication configuration and V2X sidelink communication configuration, UE may consider the frequency providing either NR sidelink communication configuration or V2X sidelink communication configuration to be the highest priority.

[0176] How the UE determines itself to be on a vehicle with a mobile-IAB cell is left to the UE's implementation.

[0177] The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

[0178] If the MBS broadcast capable UE is receiving or interested to receive an MBS broadcast service(s) and can only receive this MBS broadcast service(s) by camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBS broadcast session as long as the two following conditions are fulfilled:

[0179] 1) SIB1 scheduling information of the cell reselected by the UE due to frequency prioritization for MBS contains SIB20;

[0180] 2) Either:

[0181] - One or more MBS FSAI(s) of that frequency is indicated in SIB21 of the serving cell and the same MBS FSAI(s) is also indicated for this MBS broadcast service in MBS User Service Description (USD), or

[0182] - SIB21 is not provided in the serving cell and that frequency is included in the USD of this service, or

[0183] - SIB21 is provided in the serving cell but does not provide the frequency mapping for the concerned service, and that frequency is included in the USD of this service.

[0184] It is up to UE implementation which frequency to select, when the USD provides multiple frequencies for the service the UE is interested in.

[0185] If the MBS broadcast capable UE is receiving or interested to receive an MBS broadcast service, the UE may consider cell reselection candidate frequencies at which it cannot receive the MBS broadcast service to be of the lowest priority during the MBS broadcast session, as long as SIB1 scheduling information of the cell contains SIB20 on the MBS frequency which the UE monitors and as long as the condition 2) above is fulfilled for the serving cell.

[0186] Example scenarios in which such down-prioritisation may be needed include the cases where camping is not possible for the UE on the MBS broadcast frequency (e.g. the MBS broadcast frequency belongs to a PLMN different from UE's registered PLMN) while the UE can receive the MBS broadcast service when camped on another frequency than the MBS broadcast frequency or current frequency.

[0187] The frequency prioritization for MBS broadcast, NR sidelink communication, or V2X sidelink communication may override the re-selection priorities for slice-based cell reselection.

[0188] In case UE receivesRRCReleasewithdeprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously receivedRRCReleasewithdeprioritisationReqor all the frequencies of NR to be the lowest priority frequency (i.e., lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection or SNPN selection is performed on request by NAS.

[0189] UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements are still applicable.

[0190] The UE does not consider MBS broadcast, NR sidelink communication or V2X sidelink communication functionality to replace cell reselection priorities caused by HSDN ordeprioritisationReqfunctionality.

[0191] The UE shall delete priorities provided by dedicated signalling when:

[0192] - the UE enters a different RRC state; or

[0193] - the optional validity time of dedicated priorities (T320) expires; or

[0194] - the UE receives anRRCReleasemessage with the fieldcellReselectionPrioritiesabsent; or

[0195] - a PLMN selection or SNPN selection is performed on request by NAS.

[0196] The UE shall not consider any exclude-listed cells as candidate for cell reselection.

[0197] The UE shall consider only the allow-listed cells, if configured, as candidates for cell reselection.

[0198] NCR-MT may be configured with additional allowed cell list and / or forbidden cell list. The NCR-MT shall consider only the allowed cell list, if configured by OAM as candidates for cell reselection (ignore above exclude-listed cells and / or allow-listed cells). The NCR-MT shall not consider the cells for cell reselection in the forbidden cell list, if configured by OAM.

[0199] The UE in RRC_IDLE state shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e., T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

[0200] The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

[0201] Hereinafter, measurement rules for cell re-selection are described. Following parameters in table 7 may be used:

[0202] SrxlevCell selection RX level value (dB)SqaulCell selection quality value (dB)SIntraSearchPSrxlev threshold (in dB) for intra-frequency measurements.SIntraSearchQSqual threshold (in dB) for intra-frequency measurements.SnonIntraSearchPSrxlev threshold (in dB) for NR inter-frequency and inter-RAT measurements.SnonIntraSearchQSqual threshold (in dB) for NR inter-frequency and inter-RAT measurements.

[0203] Following rules are used by the UE to limit needed measurements:1> If the serving cell fulfils Srxlev > SIntraSearchPand Squal > SIntraSearchQ:

[0204] 2> IfdistanceThreshandreferenceLocationare broadcasted inSIB19, and if UE supports location-based measurement initiation for NTN (quasi-)Earth-fixed cell and has obtained its location information:

[0205] 3> If the distance between UE and the serving cell reference locationreferenceLocationis shorter thandistanceThresh, the UE may not perform intra-frequency measurements;

[0206] 3> Else, the UE shall perform intra-frequency measurements;

[0207] 2> else ifdistanceThreshandmovingReferenceLocationare broadcasted inSIB19, and if UE supports location-based measurement initiation for NTN Earth-moving cell and has obtained its location information:

[0208] 3> if the distance between UE's location and the serving cell reference location determined based onmovingReferenceLocationis shorter thandistanceThresh, the UE may not perform intra-frequency measurements;

[0209] 3> else, the UE shall perform intra-frequency measurements;

[0210] 2> Else, the UE may not perform intra-frequency measurements;

[0211] 1> Else, the UE shall perform intra-frequency measurements.

[0212] 1> The UE shall apply the following rules for NR inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority:

[0213] 2> For a NR inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies.

[0214] 2> For a NR inter-frequency with an equal or lower reselection priority than the reselection priority of the current NR frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current NR frequency:

[0215] 3> If the serving cell fulfils Srxlev > SnonIntraSearchPand Squal > SnonIntraSearchQ:

[0216] 4> IfdistanceThreshandreferenceLocationare broadcasted inSIB19, and if UE supports location-based measurement initiation for NTN (quasi-)Earth-fixed cell and has obtained its UE location information:

[0217] 5> If the distance between UE and the serving cell reference locationreferenceLocationis shorter thandistanceThresh, the UE may choose not to perform measurements of NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority;

[0218] 5> Else, the UE shall perform measurements of NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority;

[0219] 4> else ifdistanceThreshandmovingReferenceLocationare broadcasted inSIB19, and if UE supports location-based measurement initiation for NTN Earth-moving cell and has obtained its location information:

[0220] 5> if the distance between UE's location and the serving cell reference location determined based onmovingReferenceLocationis shorter thandistanceThresh, the UE may not perform measurements of NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority;

[0221] 5> else, the UE shall perform measurements of NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority;

[0222] 4> Else, the UE may choose not to perform measurements of NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority;

[0223] 3> Else,the UE shall perform measurements of NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority.

[0224] 1> If the UE supports relaxed measurement andrelaxedMeasurementis present inSIB2, the UE may further relax the needed measurements.

[0225] 1> For UE camping on NTN cell, if the UE supports skipping TN measurement, and the UE has obtained its location information, and ifcoverageAreaInfoListandtn-AreaIdListare broadcast in system information, the UE may not perform measurements of a TN frequency when UE is not in the coverage of that frequency provided viatn-AreaIdList, regardless of the frequency priority.

[0226] If thet-Serviceof the serving cell is present inSIB19, and if UE supports time-based measurement initiation, the UE shall perform intra-frequency, inter-frequency or inter-RAT measurements before thet-Service, regardless of the distance between UE and the serving cell reference location or whether the serving cell fulfils Srxlev > SIntraSearchPand Squal > SIntraSearchQ, or Srxlev > SnonIntraSearchPand Squal > SnonIntraSearchQ, The exact time to start measurement beforet-Serviceis up to UE implementation. UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies regardless of the remaining service time of the serving cell (i.e., time remaining untilt-Service).

[0227] When evaluating the distance between UE and the serving cell reference location, it is up to UE implementation to obtain UE location information.

[0228] In the Earth-moving cell, it is up to UE implementation to maintain a valid serving cell reference location, which is derived based on the serving satellite ephemeris,epochTimeandmovingReferenceLocation.

[0229] Hereinafter, cell reselection criteria are described.

[0230] I. Inter-frequency and inter-RAT Cell Reselection criteria

[0231] IfthreshServingLowQis broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

[0232] - A cell of a higher priority NR or EUTRAN RAT / frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT

[0233] Otherwise, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

[0234] - A cell of a higher priority RAT / frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

[0235] - More than 1 second has elapsed since the UE camped on the current serving cell.

[0236] Cell reselection to a cell on an equal priority NR frequency shall be based on ranking for intra-frequency cell reselection.

[0237] IfthreshServingLowQis broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

[0238] - The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority NR or E-UTRAN RAT / frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT.

[0239] Otherwise, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

[0240] - The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT / frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

[0241] - More than 1 second has elapsed since the UE camped on the current serving cell.

[0242] Cell reselection to a higher priority RAT / frequency shall take precedence over a lower priority RAT / frequency if multiple cells of different priorities fulfil the cell reselection criteria.

[0243] If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

[0244] - If the highest-priority frequency is an NR frequency, the highest ranked cell among the cells on the highest priority frequency(ies) meeting the criteria;

[0245] - If the highest-priority frequency is from another RAT, the strongest cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

[0246] II. Intra-frequency and equal priority inter-frequency Cell Reselection criteria

[0247] The cell-ranking criterion Rs for serving cell and Rn for neighbouring cells is defined by:

[0248] - Rs= Qmeas,s+Qhyst- Qoffsettemp; and

[0249] - Rn= Qmeas,n-Qoffset - Qoffsettemp

[0250] Parameters related to the cell-ranking criterion are described in table 8:

[0251] QmeasRSRP measurement quantity used in cell reselections.QoffsetFor intra-frequency: Equals to Qoffsets,n, if Qoffsets,nis valid,otherwise this equals to zero.For inter-frequency: Equals to Qoffsets,nplus Qoffsetfrequency, ifQoffsets,nis valid, otherwise this equals to Qoffsetfrequency.QoffsettempOffset temporarily applied to a cellQhysthysteresis value for ranking criteria.Qoffsets,noffset between the two cells (e.g., serving cell and neighbor cell)QoffsetfrequencyFrequency specific offset for equal priority NR frequencies

[0252] The UE shall perform ranking of all cells that fulfil the cell selection criterion S.The cells shall be ranked according to the R criteria specified above by deriving Qmeas,nand Qmeas,sand calculating the R values using averaged RSRP results.

[0253] IfrangeToBestCellis not configured, the UE shall perform cell reselection to the highest ranked cell. IfrangeToBestCellis configured,then the UE shall perform cell reselection to the cell with the highest number of beams above the threshold (i.e.absThreshSS-BlocksConsolidation) among the cells whose R value is withinrangeToBestCellof the R value of the highest ranked cell. If there are multiple such cells, the UE shall perform cell reselection to the highest ranked cell among them.

[0254] In all cases, the UE shall reselect the new cell, only if the following conditions are met:

[0255] - the new cell is better than the serving cell according to the cell reselection criteria specified above during a time interval TreselectionRAT;

[0256] - more than 1 second has elapsed since the UE camped on the current serving cell.

[0257] IfrangeToBestCellis configured butabsThreshSS-BlocksConsolidationis not configured on an NR frequency, the UE considers that there is one beam above the threshold for each cell on that frequency.

[0258] Meanwhile, NTN-capable UE in RRC_IDLE / INACTIVE may need to adjust the synchronization signal (SS) / physical broadcast channel (PBCH) block measurement timing configuration (SMTC) of NTN neighbor cell due to the drift of propagation delay difference between NTN serving cell and NTN neighbor cell. In TN, NTN-capable UE may also need to perform adjustment of SMTC to detect NTN neighbor cells. TN cell may be allowed to broadcast SIB19 to provide the assistance information of NTN neighbor cell to perform SMTC adjustment. In TN, SIB19 may be categorized as other SIB provided by either periodically broadcast, broadcast on-demand, or in a dedicated manner.

[0259] The assistance information of NTN neighbor cell may comprise ephemeris information (e.g.,ephemerisInfo), epoch time (e.g.,epochTime), and / or UL synchronization validity duration (e.g.,ntn-UlSyncValidityDuration). The UE may consider the ephemeris information to be valid from the epoch time during the validity duration. The validity duration of the ephemeris information may range from 5 seconds to 900 seconds, which is rather shorter than validity duration of the legacy SIB.

[0260] UE camping normally on TN cell shall perform measurement on equal or lower priority frequency listed in SIB4 when Srxlev is below SnonIntraSearchPor Squal is below SnonIntraSearchQ. NTN frequency may always be lower prioritized than TN frequency. Accordingly, the UE shall perform measurement on NTN frequency when Srxlev is below SnonIntraSearchPor Squal is below SnonIntraSearchQ. To perform measurement on NTN frequency, UE should maintain valid SIB19. However, if there is a TN neighbor cell satisfying cell reselection criteria, the measurement of NTN frequency may be redundant. Such redundant measurement may cause frequent SIB19 acquisition, leading to excessive UE power consumption.

[0261] Another problem is that UE may not be able to receive SIB19 if there is no TN neighbor cell satisfying cell reselection criteria. If there is no TN neighbor cell, the radio quality of TN serving cell may be really bad for acquiring SIB19. UE may fall into any cell selection state, which causes severe interruption until UE finds a suitable NTN cell.

[0262] Therefore, the present disclosure provides various embodiments for measurements on NTN frequency.

[0263] FIG. 9 shows an example of a method performed by a UE for measurements on NTN frequency according to an embodiment of the present disclosure.

[0264] Referring to FIG. 9, in step S901, the UE may obtain information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency. A priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies.

[0265] In step S903, the UE may obtain a measurement value for a serving cell on a serving frequency.

[0266] In step S905, the UE may evaluate the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell.

[0267] In step S907, the UE may perform a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0268] According to various embodiments, the UE may receive, from a network, the information for the list of second type frequencies.

[0269] According to various embodiments, the information for the list of second type frequencies may comprise indications of second type frequencies in a list of frequencies configured by the network. The list of second type frequencies may comprise frequencies indicated by the indications in the list of frequencies. The list of first type frequencies may comprise remaining frequencies after excluding the frequencies indicated by the indications in the list of frequencies.

[0270] According to various embodiments, the UE may receive, from a network, the information for the list of first type frequencies.

[0271] According to various embodiments, the information for the list of first type frequencies may comprise indications of first type frequencies in a list of frequencies configured by the network. The list of first type frequencies may comprise frequencies indicated by the indications in the list of frequencies. The list of second type frequencies may comprise remaining frequencies after excluding the frequencies indicated by the indications in the list of frequencies.

[0272] According to various embodiments, the measurement value for the serving cell may comprise at least one of a reception level of the serving cell (e.g., Srxlev), or a quality of the serving cell (e.g., Squal). The information for the condition of inter-frequency measurement may comprise at least one of a reception level threshold for inter-frequency measurement (e.g., SnonIntraSearchP) or a quality threshold for inter-frequency measurement (e.g., SnonIntraSearchQ). The condition of inter-frequency measurement may be satisfied based on i) the reception level of the serving cell being lower than the reception level threshold for inter-frequency measurement, or ii) the quality of the serving cell being lower than the quality threshold for inter-frequency measurement.

[0273] According to various embodiments, the information for the condition of measuring second type frequency may comprise at least one of a first threshold lower than the reception level threshold for inter-frequency measurement or a second threshold lower than the quality threshold for inter-frequency measurement. The condition of measuring second type frequency may be satisfied based on i) the reception level of the serving cell being lower than the first threshold, or ii) the quality of the serving cell being lower than the second threshold.

[0274] According to various embodiments, the UE may perform a measurement on one or more inter-frequencies in the list of second type frequencies, based on the condition of measuring second type frequency being satisfied.

[0275] According to various embodiments, the UE may acquire a system information comprising assistance information for measuring second type frequency, based on the condition of measuring second type frequency being satisfied.

[0276] According to various embodiments, the system information may be a system information block type 19 (SIB19).

[0277] According to various embodiments, the UE may perform a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies, based on the condition of measuring second type frequency being satisfied.

[0278] According to various embodiments, the list of first type frequencies may comprise a list of terrestrial network (TN) frequencies. The list of second type frequencies may comprise a list of non-terrestrial network (NTN) frequencies.

[0279] According to various embodiments, the UE may receive, from a network, information including list of frequencies and thresholds. The thresholds may comprise SnonIntraSearchP, SnonIntraSearchQ, a first threshold and a second threshold. The list of frequencies may comprise the first category of frequencies (i.e., first type frequencies) and the second category of frequencies (i.e., second type frequencies). The UE may perform a measurement on a serving cell to derive Srxlev and Squal of the serving cell. The UE may perform a measurement on equal or lower priority frequency in the first category of frequencies if Srxlev is lower than SnonIntraSearchPor Squal is lower than SnonIntranSeachQ, and if Srxlev is higher than the first threshold and Squal is higher than the second threshold. The UE may perform measurement on frequency in the second category of frequencies and equal or lower priority frequency in the first category of frequencies if Srxlev is lower than the first threshold or Squal is lower than the second threshold.

[0280] FIG. 10 shows an example of a signal flow between a UE and a network node for measurements on NTN frequency according to an embodiment of the present disclosure.

[0281] Referring to FIG. 10, in step S1001, the network node may transmit, to the UE, information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency. A priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies.

[0282] In step S1003, the UE may obtain a measurement value for a serving cell on a serving frequency.

[0283] In step S1005, the UE may evaluate the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell.

[0284] In step S1007, the UE may perform a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0285] Hereinafter, detailed implementations regarding measurements on NTN frequency are described.

[0286] In the present disclosure, the UE in RRC_IDLE / INACTIVE may perform measurements of NTN inter-frequency cells according to the additional measurement control thresholds as follows.

[0287] NTN inter-frequency (or, second type frequency) may be indicated via system information (e.g., SIBx).

[0288] For example, NTN inter-frequency may containsmtc4listwithin SIB4. Thesmtc4listmay be measurement timing configuration list for NTN deployments. The structure of thesmtc4listis shown in table 9:

[0289] smtc4list-r17 SSB-MTC4List-r17 OPTIONAL -- Need RSSB-MTC4List-r17::= SEQUENCE (SIZE(1..3)) OF SSB-MTC4-r17SSB-MTC4-r17 ::= SEQUENCE {pci-List-r17 SEQUENCE (SIZE (1..maxNrofPCIsPerSMTC)) OF PhysCellId offset-r17 INTEGER (0..159)}

[0290] In table 9:-pci-Listmay be PCIs that follow this SMTC.

[0291] -offsetmay be an offset of the measurement window in which to receive SS / PBCH blocks Offset is given in number of subframes.

[0292] The offset of each SSB-MTC4 insmtc4listmay be based on the assumption that the gNB-UE propagation delay difference between the serving cell and neighbour cells equals to 0 ms, and UE can adjust the actualoffsetbased on the actual propagation delay difference. For a UE that supports less SMTCs than what is included in this list, it is up to the UE to select which SMTCs to consider.

[0293] For example, NTN inter-frequency may be listed in NTN neighbor cell configuration list (e.g.,ntn-NeighCellConfigList, ntn-NeighCellConfigListExt) within SIB19.

[0294] Non-NTN inter-frequency (i.e., TN inter-frequency / first type frequency) of equal or lower priority may be identified as the remaining frequency(-ies) listed within SIB4 except for NTN inter-frequency.

[0295] The additional measurement control thresholds may comprise the first threshold and the second threshold.

[0296] The first threshold may be equal or lower than SnonIntraSearchP.

[0297] The second threshold may be equal or lower than SnonIntraSearchQ.

[0298] The first threshold and the second threshold may be provided by network, via system information and / or dedicated RRC message.

[0299] For an NTN inter-frequency with an equal or lower reselection priority than the reselection priority of the current frequency:

[0300] 1> if Srxlev is lower than SnonIntraSearchPor Squal is lower than SnonIntraSearchQ(i.e., condition of inter-frequency measurement is satisfied):

[0301] 2> if Srxlev is higher than the first threshold and Squal is higher than the second threshold (i.e., condition of measuring second type frequency is not satisfied):

[0302] 3> UE may choose not to acquire / request the required system information, e.g., SIB19; and / or

[0303] 3> UE may choose not to perform measurements of NTN inter-frequency cells;

[0304] 2> Else (i.e., condition of measurement second type frequency is satisfied):

[0305] 3> UE shall acquire system information required to perform NTN inter-frequency measurements, e.g., SIB19 as follows:

[0306] - Ifsi-broadcastStatusof required system information is set tonotBroadcasting, but it is scheduled in scheduling information broadcasted by the cell, UE requests required system information; and / or

[0307] - Ifsi-broadcastStatusof required system information is set toBroadcasting,UE acquires required system information;

[0308] 3> UE shall perform measurements of NTN inter-frequency cells.

[0309] For a non-NTN inter-frequency (e.g., TN inter-frequency / first type frequency) with an equal or lower reselection priority than the reselection priority of the current frequency:

[0310] 1> if Srxlev is lower than SnonIntraSearchPor Squal is lower than SnonIntraSearchQ(i.e., condition of inter-frequency measurement is satisfied):

[0311] 2> UE shall perform measurements of inter-frequency cells;

[0312] 1> else:

[0313] 2> UE may choose not to acquire / request the required system information, e.g., SIB19; and / or

[0314] 2> UE may choose not to perform measurements of inter-frequency cells.

[0315] FIG. 11 shows an example of measurement rules for NTN frequency according to an embodiment of the present disclosure.

[0316] Referring to FIG. 11, in case the first threshold and the second threshold are not configured, when Srxlev is lower than SnonIntraSearchPor Squal is lower than SnonIntraSearchQ, UE may perform measurements on not only TN inter-frequency but also NTN inter-frequency. If there is a TN neighbour cell which is suitable for camping on, UE doesn't need to measure NTN inter-frequency.

[0317] In case the first threshold and the second threshold are configured, when Srxlev is lower than SnonIntraSearchPor Squal is lower than SnonIntraSearchQbut Srxlev is higher than the first threshold and Squal is higher than the second threshold, the UE can save its power consumption by not performing the measurements on the NTN inter-frequency and by not requesting / acquiring SIB19. When the Srxlev is lower than the first threshold or Squal is lower than the second threshold, the UE may try to acquire SIB19, e.g., request the transmission of SIB19, and initiate measurements on NTN inter-frequencies indicated in SIB19.

[0318] Furthermore, the method in perspective of the UE described in the present disclosure (e.g., in FIG. 9) may be performed by the first wireless device 100 shown in FIG. 2 and / or the UE 100 shown in FIG. 3.

[0319] More specifically, the UE comprises at least one transceiver, at least processor, and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations.

[0320] The operations comprise: obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency, wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies; obtaining a measurement value for a serving cell on a serving frequency; evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; and performing a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0321] Furthermore, the method in perspective of the UE described in the present disclosure (e.g., in FIG. 9) may be performed by a software code 105 stored in the memory 104 included in the first wireless device 100 shown in FIG. 2.

[0322] More specifically, at least one computer readable medium (CRM) stores instructions that, based on being executed by at least one processor, perform operations comprising: obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency, wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies; obtaining a measurement value for a serving cell on a serving frequency; evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; and performing a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0323] Furthermore, the method in perspective of the UE described in the present disclosure (e.g., in FIG. 9) may be performed by control of the processor 102 included in the first wireless device 100 shown in FIG. 2 and / or by control of the processor 102 included in the UE 100 shown in FIG. 3.

[0324] More specifically, an apparatus configured to / adapted to operate in a wireless communication system (e.g., communication device / UE) comprises at least processor, and at least one computer memory operably connectable to the at least one processor. The at least one processor is configured to / adapted to perform operations comprising: obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency, wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies; obtaining a measurement value for a serving cell on a serving frequency; evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; and performing a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0325] Furthermore, the method in perspective of a network node described in the present disclosure (e.g., in FIG. 10) may be performed by the second wireless device 200 shown in FIG. 2. The network node may be related to a serving cell.

[0326] More specifically, the network node comprises at least one transceiver, at least processor, and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations.

[0327] The operations comprise: transmitting, to a user equipment (UE), information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency, wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies, wherein the UE is configured to perform operations comprising: obtaining a measurement value for a serving cell on a serving frequency; evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; and performing a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

[0328] The present disclosure may have various advantageous effects.

[0329] For example, UE can maintain valid ephemeris of NTN neighbor cell prior to perform measurement on NTN frequency with proper UE power consumption.

[0330] Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and / or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

[0331] Claims in the present disclosure can be combined in a various way. For instance, technical features in method claims of the present disclosure can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method. Other implementations are within the scope of the following claims.

Claims

1.A method comprising:obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency,wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies;obtaining a measurement value for a serving cell on a serving frequency;evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; andperforming a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.2.The method of claim 1, wherein the obtaining of the information for the list of second type frequencies comprises receiving, from a network, the information for the list of second type frequencies.3.The method of claim 1, wherein the information for the list of second type frequencies comprises indications of second type frequencies in a list of frequencies configured by the network,wherein the list of second type frequencies comprises frequencies indicated by the indications in the list of frequencies, andwherein the list of first type frequencies comprises remaining frequencies after excluding the frequencies indicated by the indications in the list of frequencies.4.The method of claim 1, wherein the obtaining of the information for the list of first type frequencies comprises receiving, from a network, the information for the list of first type frequencies.5.The method of claim 1, wherein the information for the list of first type frequencies comprises indications of first type frequencies in a list of frequencies configured by the network,wherein the list of first type frequencies comprises frequencies indicated by the indications in the list of frequencies, andwherein the list of second type frequencies comprises remaining frequencies after excluding the frequencies indicated by the indications in the list of frequencies.6.The method of claim 1, wherein the measurement value for the serving cell comprises at least one of a reception level of the serving cell, or a quality of the serving cell,wherein the information for the condition of inter-frequency measurement comprises at least one of a reception level threshold for inter-frequency measurement or a quality threshold for inter-frequency measurement, andwherein the condition of inter-frequency measurement is satisfied based on i) the reception level of the serving cell being lower than the reception level threshold for inter-frequency measurement, or ii) the quality of the serving cell being lower than the quality threshold for inter-frequency measurement.7.The method of claim 6, wherein the information for the condition of measuring second type frequency comprises at least one of a first threshold lower than the reception level threshold for inter-frequency measurement or a second threshold lower than the quality threshold for inter-frequency measurement, andwherein the condition of measuring second type frequency is satisfied based on i) the reception level of the serving cell being lower than the first threshold, or ii) the quality of the serving cell being lower than the second threshold.8.The method of claim 1, further comprising performing a measurement on one or more inter-frequencies in the list of second type frequencies, based on the condition of measuring second type frequency being satisfied.9.The method of claim 1, further comprising acquiring a system information comprising assistance information for measuring second type frequency, based on the condition of measuring second type frequency being satisfied.10.The method of claim 9, wherein the system information is a system information block type 19 (SIB19).11.The method of claim 1, further comprising performing a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies, based on the condition of measuring second type frequency being satisfied.12.The method of claim 1, wherein the list of first type frequencies comprises a list of terrestrial network (TN) frequencies, andwherein the list of second type frequencies comprises a list of non-terrestrial network (NTN) frequencies.13.The method of claims 1, wherein the method is performed by a user equipment (UE) in communication with at least one of a mobile device, a network, or autonomous vehicles.14.A user equipment (UE) comprising:at least one transceiver;at least one processor; andat least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency,wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies;obtaining a measurement value for a serving cell on a serving frequency;evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; andperforming a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.15.An apparatus comprising:at least processor; andat least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency,wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies;obtaining a measurement value for a serving cell on a serving frequency;evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; andperforming a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.16.A non-transitory computer readable medium (CRM) having stored thereon a program code implementing instructions that, based on being executed by at least one processor, perform operations comprising:obtaining information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency,wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies;obtaining a measurement value for a serving cell on a serving frequency;evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; andperforming a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.17.A method comprising:transmitting, to a user equipment (UE), information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency,wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies,wherein the UE is configured to perform operations comprising:obtaining a measurement value for a serving cell on a serving frequency;evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; andperforming a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.18.A network node comprising:at least one transceiver;at least one processor; andat least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:transmitting, to a user equipment (UE), information for a list of first type frequencies, information for a list of second type frequencies, information for a condition of inter-frequency measurement, and information for a condition of measuring second type frequency,wherein a priority of any frequency in the list of second type frequencies is lower than that of any frequency in the list of first type frequencies,wherein the UE is configured to perform operations comprising:obtaining a measurement value for a serving cell on a serving frequency;evaluating the condition of inter-frequency measurement and the condition of measuring second type frequency based on the measurement value for the serving cell; andperforming a measurement on one or more inter-frequencies of which priority is equal to or lower than the serving frequency in the list of first type frequencies and not in the list of second type frequencies, based on i) the condition of inter-frequency measurement being satisfied, and ii) the condition of measuring second type frequency being not satisfied.

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