Prioritization for cell reselection

Abstract

The invention relates to prioritization for cell reselection in a wireless communication system. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system comprises the steps of: identifying a cell whose quality is higher than a quality threshold; prioritizing the cells for cell reselection based on i) receiving system information from the network notifying that the cells are mobile cells, and ii) a relative mobility state between the UE and the cells; and performing a cell reselection to one of the cells including the priority cell.

Description

Technical Field

[0001] The present disclosure relates to prioritization for cell reselection in wireless communications. Background Art

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

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

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

[0005] The UE may move while the UE is in a connected state or an idle state. In the connected state, as the UE moves toward the target cell, the UE may perform a handover to the target cell. In the idle state, the UE may perform a cell reselection as the UE moves. For cell reselection, the UE may prioritize one or more cells for cell reselection. Summary of the invention

[0006] Technical Solution

[0007] An aspect of the present disclosure is to provide a method and apparatus for prioritization for cell reselection in a wireless communication system.

[0008] According to one embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes the following steps: identifying a cell whose quality is higher than a quality threshold; prioritizing the cell for cell reselection based on i) system information received from a network notifying that the cell is a mobile cell; and ii) a relative mobility state between the UE and the cell; and performing cell reselection to one of the cells including the priority cell.

[0009] According to one embodiment of the present disclosure, a user equipment (UE) configured to operate in a wireless communication system includes: at least one transceiver; at least one processor; and at least one memory, which is operatively connected to the at least one processor and stores instructions, the instructions performing operations based on being executed by the at least one processor, the operations including: identifying cells whose quality is higher than a quality threshold; prioritizing cells for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) a relative mobility state between the UE and the cell; and performing cell reselection to one of the cells including the priority cell.

[0010] According to one embodiment of the present disclosure, a network node configured to operate in a wireless communication system includes: at least one transceiver; at least one processor; and at least one memory, which is operatively connected to the at least one processor and stores instructions, wherein the instructions perform operations based on being executed by the at least one processor, the operations including: sending system information notifying that a cell is a mobile cell to a user equipment (UE); and sending information for cell reselection parameters to the UE, wherein the UE is configured to: identify that the quality of the cell is higher than a quality threshold; prioritize the cell for cell reselection based on i) receiving the system information notifying that the cell is a mobile cell; and ii) the relative mobility state between the UE and the cell; and perform cell reselection to one of the cells including the priority cell.

[0011] According to one embodiment of the present disclosure, a method performed by a network node configured to operate in a wireless communication system includes the following steps: sending system information notifying that a cell is a mobile cell to a user equipment (UE); and sending information for a cell reselection parameter to the UE, wherein the UE is configured to: identify that the quality of the cell is higher than a quality threshold; prioritize the cell for cell reselection based on i) receiving the system information notifying that the cell is a mobile cell; and ii) a relative mobility state between the UE and the cell; and perform cell reselection to one of the cells including the priority cell.

[0012] According to one embodiment of the present disclosure, a device suitable for operating in a wireless communication system includes: at least a processor; and at least one memory, which is operatively connected to the at least one processor and stores instructions, the instructions performing operations based on being executed by the at least one processor, the operations including: identifying cells whose quality is higher than a quality threshold; prioritizing cells for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) a relative mobility state between a UE and the cell; and performing cell reselection to one of the cells including the priority cell.

[0013] According to one embodiment of the present disclosure, a non-transitory computer readable medium (CRM) stores thereon program code implementing instructions, the instructions being executed by at least one processor to perform operations, the operations comprising: identifying cells having quality above a quality threshold; prioritizing cells for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) a relative mobility state between a UE and the cell; and performing cell reselection to one of the cells including the priority cell.

[0014] The present disclosure may have various beneficial effects.

[0015] For example, the UE prioritizes the current serving cell that meets the merging condition so that the UE can remain camped on the cell.

[0016] For example, the UE prioritizes neighbor cells that meet the merging condition so that the UE can reselect cells.

[0017] For example, an on-board UE in a mobile cell may avoid unnecessary cell reselection, and / or a non-on-board UE may avoid unnecessary reselection.

[0018] The beneficial effects that can be obtained by the specific embodiments of the present disclosure are not limited to the beneficial effects listed above. For example, there may be various technical effects that can be understood by a person skilled in the relevant art and / or derived from the present disclosure. Therefore, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that can be understood or derived from the technical features of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An example of a communication system to which an implementation of the present disclosure is applied is shown.

[0020] Figure 2 An example of a wireless device to which an implementation of the present disclosure is applied is shown.

[0021] Figure 3 An example of a UE to which an implementation of the present disclosure is applied is shown.

[0022] Figure 4 and Figure 5 An example of a protocol stack in a 3GPP-based wireless communication system to which an implementation of the present disclosure is applied is shown.

[0023] Figure 6 The frame structure in a 3GPP-based wireless communication system to which the implementation of the present disclosure is applied is shown.

[0024] Figure 7 An example of data flow in a 3GPP NR system to which an implementation of the present disclosure is applied is shown.

[0025] FIG. 8A to FIG. 8E An example of an Srxlev graph related to the relative mobility state between a UE and a cell according to one embodiment of the present disclosure is shown.

[0026] Fig. 9 An example of a method performed by a UE according to an embodiment of the present disclosure is shown.

[0027] Fig.10 An example of a signal flow between a network node and a UE according to one embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0028] The following techniques, devices and systems can be applied to various wireless multiple access systems. Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and multi-carrier frequency division multiple access (MC-FDMA) systems. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE adopts OFDMA in the downlink (DL) and SC-FDMA in the uplink (UL). Evolutions of 3GPP LTE include LTE-Advanced (LTE-A), LTE-A Pro and / or 5G New Radio (NR).

[0029] For ease of description, the implementation of the present disclosure is mainly described with respect to a 3GPP-based wireless communication system. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP-based wireless communication system, various aspects of the present disclosure that are not limited to a 3GPP-based wireless communication system are applicable to other mobile communication systems.

[0030] For terms and techniques not specifically described among the terms and techniques adopted in the present disclosure, reference may be made to wireless communication standard documents published prior to the present disclosure.

[0031] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0032] In the present disclosure, a slash ( / ) or a comma (,) may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0033] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, the expression "at least one of A or B" or "at least one of A and / or B" in the present disclosure may be interpreted as being the same as "at least one of A and B".

[0034] 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".

[0035] In addition, the brackets used in the present disclosure may mean "for example". In detail, when it is shown as "control information (PDCCH)", "PDCCH" may be cited as an example of "control information". In other words, in the present disclosure, "control information" is not limited to "PDCCH", and "PDCCH" may be cited as an example of "control information". In addition, even when it is shown as "control information (ie, PDCCH)", "PDCCH" may be cited as an example of "control information".

[0036] The technical features described separately in one figure in the present disclosure can be implemented separately or simultaneously.

[0037] Although not limited to this, the various descriptions, functions, processes, suggestions, methods and / or operational flowcharts of the present disclosure disclosed herein can be applied to various fields that require wireless communication and / or connection between devices (e.g., 5G).

[0038] Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings. Unless otherwise specified, the same reference numerals in the following drawings and / or descriptions may refer to the same and / or corresponding hardware blocks, software blocks and / or functional blocks.

[0039] Figure 1 An example of a communication system to which an implementation of the present disclosure is applied is shown.

[0040] Figure 1 The 5G usage scenarios shown are only exemplary, and the technical features of the present disclosure can be applied to Figure 1 Other 5G usage scenarios not shown.

[0041] The three main demand categories for 5G include: (1) enhanced mobile broadband (eMBB) category, (2) massive machine type communication (mMTC) category, and (3) ultra-reliable and low-latency communication (URLLC) category.

[0042] Reference Figure 1 , the communication system 1 includes wireless devices 100a to 100f, a base station (BS) 200, and a network 300. Figure 1 A 5G network is illustrated as an example of a network of the communication system 1, but implementations of the present disclosure are not limited to the 5G system and may be applied to future communication systems other than the 5G system.

[0043] BS 200 and network 300 may be implemented as wireless devices, and a specific wireless device may operate as a BS / network node relative to other wireless devices.

[0044] The wireless devices 100a to 100f represent devices that perform communication using a radio access technology (RAT) (e.g., 5G NR or LTE) and may be referred to as communication / radio / 5G devices. The wireless devices 100a to 100f may include, but are not limited to, a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. A vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters.

[0045] In the present disclosure, the wireless devices 100a to 100f may be referred to as user equipment (UE). UE may include, for example, a cellular phone, a smart phone, a laptop computer, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a plate-shaped personal computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle with an autonomous driving function, a connected car, a UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a FinTech device (or a financial device), a security device, a weather / environmental device, a device related to 5G services, or a device related to the field of the fourth industrial revolution.

[0046] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a super 5G network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS 200 / network 300. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0047] Wireless communication / connection 150a, 150b, and 150c may be established between wireless devices 100a to 100f and / or between wireless devices 100a to 100f and BS 200 and / or between BS 200. Here, wireless communication / connection may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)), etc. The wireless devices 100a to 100f and BS 200 / wireless devices 100a to 100f may send / receive radio signals to / from each other through wireless communication / connection 150a, 150b, and 150c. For example, wireless communication / connection 150a, 150b, and 150c may send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of the resource allocation process can be performed based on various proposals of the present disclosure.

[0048] NR supports multiple numerologies (and / or multiple subcarrier spacings (SCS)) to support various 5G services. For example, if the SCS is 15kHz, wide areas can be supported in traditional cellular bands, while if the SCS is 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. If the SCS is 60kHz or higher, bandwidths greater than 24.25GHz can be supported to overcome phase noise.

[0049] The NR frequency band may be defined as two types of frequency ranges, namely, frequency range 1 (FR1) and frequency range 2 (FR2). The numerical values ​​of the frequency ranges may be changed. For example, the two types of frequency ranges (FR1 and FR2) may be as shown in Table 1 below. For ease of explanation, in the frequency range used in the NR system, FR1 may mean "a range below 6 GHz", FR2 may mean "a range above 6 GHz", and may be referred to as millimeter wave (mmW).

[0050] [Table 1]

[0051] Frequency range name Corresponding frequency range Subcarrier spacing FR1 450MHz-6000MHz 15, 30, 60kHz FR2 24250MH-52600MHz 60, 120, 240kHz

[0052] As described above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a frequency band of 410 MHz to 7125 MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or higher. For example, a frequency band of 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or more included in FR1 may include an unlicensed frequency band. The unlicensed frequency band may be used for various purposes, for example, for communication of vehicles (e.g., autonomous driving).

[0053] [Table 2]

[0054] Frequency range name Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0055] Here, the radio communication technology implemented in the wireless device in the present disclosure may include narrowband Internet of Things (NB-IoT) technology for low power communication and LTE, NR and 6G. For example, NB-IoT technology may be an example of low power wide area network (LPWAN) technology, which may be implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the above names. Additionally and / or alternatively, the radio communication technology implemented in the wireless device in the present disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology, and may be called by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented in at least one of various specifications, such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and may not be limited to the above names. Additionally and / or alternatively, the radio communication technology implemented in the wireless device in the present disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN considering low power communication, and may not be limited to the above names. For example, ZigBee technology may generate a personal area network (PAN) associated with small / low power digital communication based on various specifications (such as IEEE 802.15.4), and may be referred to as various names. Figure 2 An example of a wireless device to which an implementation of the present disclosure is applied is shown.

[0056] exist Figure 2 In the embodiment, the first wireless device 100 and / or the second wireless device 200 may be implemented in various forms according to the usage / service. For example, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 1 At least one of {wireless devices 100a to 100f and BS200}, {wireless devices 100a to 100f and wireless devices 100a to 100f} and / or {BS200 and BS200}. The first wireless device 100 and / or the second wireless device 200 may be configured by various elements, devices / components and / or modules.

[0057] The first wireless device 100 may include at least one transceiver (eg, transceiver 106 ), at least one processing chip (eg, processing chip 101 ), and / or one or more antennas 108 .

[0058] The processing chip 101 may include at least one processor (eg, the processor 102 ) and at least one memory (eg, the memory 104 ). Additionally and / or alternatively, the memory 104 may be placed outside the processing chip 101 .

[0059] The processor 102 may control the memory 104 and / or the transceiver 106, and may be adapted to implement the descriptions, functions, processes, suggestions, methods, and / or operational flow charts described in the present disclosure. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then send a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104.

[0060] The memory 104 may be operatively connected to the processor 102. The memory 104 may store various types of information and / or instructions. The memory 104 may store firmware and / or software code 105 that implements codes, commands, and / or command sets that, when executed by the processor 102, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 105 may control the processor 102 to execute one or more protocols. For example, the firmware and / or software code 105 may control the processor 102 to execute one or more layers of a wireless interface protocol.

[0061] In this document, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, the first wireless device 100 may represent a communication modem / circuit / chip.

[0062] The second wireless device 200 may include at least one transceiver (eg, transceiver 206 ), at least one processing chip (eg, processing chip 201 ), and / or one or more antennas 208 .

[0063] The processing chip 201 may include at least one processor (eg, the processor 202 ) and at least one memory (eg, the memory 204 ). Additionally and / or alternatively, the memory 204 may be placed outside the processing chip 201 .

[0064] The processor 202 may control the memory 204 and / or the transceiver 206, and may be adapted to implement the descriptions, functions, processes, suggestions, methods, and / or operational flow charts described in the present disclosure. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then send a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204.

[0065] The memory 204 may be operatively connected to the processor 202. The memory 204 may store various types of information and / or instructions. The memory 204 may store firmware and / or software code 205 that implements codes, commands, and / or command sets that, when executed by the processor 202, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 205 may control the processor 202 to execute one or more protocols. For example, the firmware and / or software code 205 may control the processor 202 to execute one or more layers of a wireless interface protocol.

[0066] In this article, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each of the transceivers 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0067] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). One or more processors 102 and 202 may generate one or more protocol data units (PDUs), one or more service data units (SDUs), messages, control information, data, or information according to the descriptions, functions, processes, suggestions, methods, and / or operation flow charts disclosed in the present disclosure. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in the present disclosure and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in the present disclosure.

[0068] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. For example, one or more processors 102 and 202 may be configured by a group of communication control processors, application processors (APs), electronic control units (ECUs), central processing units (CPUs), graphics processing units (GPUs), and memory control processors.

[0069] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. 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, cache memory, computer-readable storage medium, and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired connection or wireless connection.

[0070] One or more transceivers 106 and 206 can send the user data, control information and / or radio signal / channel mentioned in the description, function, process, suggestion, method and / or operation flow chart disclosed in the present disclosure to one or more other devices. One or more transceivers 106 and 206 can receive the user data, control information and / or radio signal / channel mentioned in the description, function, process, suggestion, method and / or operation flow chart disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can send user data, control information or radio signal to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can receive user data, control information or radio signal from one or more other devices.

[0071] One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. Additionally or alternatively, one or more transceivers 106 and 206 may include one or more antennas 108 and 208. One or more transceivers 106 and 206 may be adapted to transmit and receive user data, control information, and / or radio signals / channels mentioned in the description, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure through one or more antennas 108 and 208. In the present disclosure, one or more antennas 108 and 208 may be multiple physical antennas or multiple logical antennas (e.g., antenna ports).

[0072] One or more transceivers 106 and 206 may convert received user data, control information, radio signals / channels, etc. from RF band signals to baseband signals, so as to process the received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters. For example, one or more transceivers 106 and 206 may up-convert OFDM baseband signals to OFDM signals through their (analog) oscillators and / or filters under the control of one or more processors 102 and 202 and transmit the up-converted OFDM signals at the carrier frequency. One or more transceivers 106 and 206 may receive an OFDM signal at a carrier frequency and down-convert the OFDM signal to an OFDM baseband signal through their (analog) oscillators and / or filters under the control of one or more processors 102 and 202 .

[0073] although Figure 2 140 . Although not shown in the figure, the wireless devices 100 and 200 may also include additional components. The additional components 140 may be configured differently depending on the type of the wireless devices 100 and 200. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) device (e.g., an audio I / O port, a video I / O port), a drive device, and a computing device. The additional components 140 may be connected to one or more processors 102 and 202 via various technologies such as a wired or wireless connection.

[0074] In an implementation of the present disclosure, a UE may be used as a transmitting device in an uplink (UL) and a receiving device in a downlink (DL). In an implementation of the present disclosure, a BS may be used as a receiving device in the UL and a transmitting device in the DL. Hereinafter, for the convenience of description, it is mainly assumed that the first wireless device 100 is used as a UE and the second wireless device 200 is used as a BS. For example, a processor 102 connected to the first wireless device 100, installed on the first wireless device 100, or started in the first wireless device 100 may be adapted to perform UE behavior according to an implementation of the present disclosure or control the transceiver 106 to perform UE behavior according to an implementation of the present disclosure. A processor 202 connected to the second wireless device 200, installed on the second wireless device 200, or started in the second wireless device 200 may be adapted to perform BS behavior according to an implementation of the present disclosure or control the transceiver 206 to perform BS behavior according to an implementation of the present disclosure.

[0075] In this disclosure, a BS is also referred to as a Node B (NB), an eNode B (eNB), or a gNB.

[0076] Figure 3 An example of a UE to which an implementation of the present disclosure is applied is shown.

[0077] Reference Figure 3 , UE 100 may correspond to Figure 2 A first wireless device 100 is provided.

[0078] UE 100 includes a processor 102 , a memory 104 , a transceiver 106 , one or more antennas 108 , a power management module 141 , a battery 142 , a display 143 , a keypad 144 , a subscriber identity module (SIM) card 145 , a speaker 146 , and a microphone 147 .

[0079] The processor 102 may be adapted to implement the descriptions, functions, processes, suggestions, methods and / or operational flow charts 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, processes, suggestions, methods and / or operational flow charts disclosed in the present disclosure. The radio interface protocol layer may be implemented in the processor 102. The processor 102 may include an ASIC, other chipsets, logic circuits and / or data processing devices. The processor 102 may be an application processor. The processor 102 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), a modem (modulator and demodulator). Examples of the processor 102 may be at MANUFACTURED BY SNAPDRAGON TM Series processors, Manufactured by EXYNOS TM Series processors, A series of processors manufactured by Made by HELIO TM Series processors, ATOM manufactured TM series processors or the corresponding next-generation processors.

[0080] The memory 104 is connected to the processor 102 when in operation and stores various information to operate the processor 102. The memory 104 may include ROM, RAM, flash memory, memory card, storage medium and / or other storage devices. When the embodiment is implemented in software, the technology described herein can be implemented using modules (e.g., processes, functions, etc.) that execute the descriptions, functions, processes, suggestions, methods and / or operation flow charts disclosed in this disclosure. The modules can be stored in the memory 104 and implemented by the processor 102. The memory 104 can be implemented within the processor 102 or outside the processor 102 (in this case, the memory can be communicatively connected to the processor 102 via various means known in the art).

[0081] The transceiver 106 is connected to the processor 102 during operation and sends and / or receives radio signals. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include a baseband circuit to process radio frequency signals. The transceiver 106 controls one or more antennas 108 to send and / or receive radio signals.

[0082] The power management module 141 manages the power of the processor 102 and / or the transceiver 106. The battery 142 supplies power to the power management module 141.

[0083] The display 143 outputs a result processed by the processor 102. The keypad 144 receives an input to be used by the processor 102. The keypad 144 may be displayed on the display 143.

[0084] The SIM card 145 is an integrated circuit designed to securely store an International Mobile Subscriber Identity (IMSI) number and its associated keys, which are used to identify and authenticate subscribers on mobile telephony devices such as mobile phones and computers. Contact information can also be stored on many SIM cards.

[0085] The speaker 146 outputs sound related results processed by the processor 102. The microphone 147 receives sound related input to be used by the processor 102.

[0086] Figure 4 and Figure 5 An example of a protocol stack in a 3GPP-based wireless communication system to which an implementation of the present disclosure is applied is shown.

[0087] Specifically, Figure 4 An example of a radio interface user plane protocol stack between a UE and a BS is illustrated, and Figure 5 An example of a radio interface control plane protocol stack between a UE and a BS is illustrated. The control plane refers to a path for transmitting control messages used to manage calls by the UE and the network. The user plane refers to a path for transmitting data generated in the application layer (for example, voice data or Internet packet data). Figure 4 , the user plane protocol stack can be divided into layer 1 (ie, PHY layer) and layer 2. Figure 5 , the control plane protocol stack can be divided into layer 1 (ie, PHY layer), layer 2, layer 3 (eg, RRC layer) and non-access stratum (NAS) layer. Layer 1, layer 2 and layer 3 are called access stratum (AS).

[0088] In the 3GPP LTE system, Layer 2 is separated into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, Layer 2 is separated into the following sublayers: MAC, RLC, PDCP, and SDAP. The PHY layer provides transport channels to the MAC sublayer, the MAC sublayer provides logical channels to the RLC sublayer, the RLC sublayer provides RLC channels to the PDCP sublayer, and the PDCP sublayer provides radio bearers to the SDAP sublayer. The SDAP sublayer provides Quality of Service (QoS) flows to the 5G core network.

[0089] In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing MAC SDUs belonging to one or different logical channels to / demultiplexing transport blocks (TBs) delivered to / from the physical layer on the transport channel; scheduling information reporting; error correction through hybrid automatic repeat request (HARQ) (one HARQ entity per cell in the case of carrier aggregation (CA); priority handling between UEs with dynamic scheduling; priority handling between logical channels of one UE with logical channel prioritization; padding. A single MAC entity can support multiple parameter sets, transmission timings, and cells. Mapping restrictions in logical channel prioritization control which parameter set(s), cell, and transmission timing a logical channel can use.

[0090] MAC provides different types of data transmission services. In order to adapt to different types of data transmission services, multiple types of logical channels are defined, that is, each logical channel supports the transmission of a specific type of information. Each logical channel type is defined by what type of information is transmitted. Logical channels are divided into two groups: control channels and traffic channels. Control channels are only used for the transmission of control plane information, and traffic channels are only used for the transmission of user plane information. The broadcast control channel (BCCH) is a downlink logical channel for broadcasting system control information, the paging control channel (PCCH) is a downlink logical channel for transmitting paging information, system information change notifications, and indications of ongoing public warning services (PWS) broadcasts, the common control channel (CCCH) is a logical channel for sending control information between the UE and the network and for UEs that do not have an RRC connection with the network, and the dedicated control channel (DCCH) is a point-to-point bidirectional logical channel that sends dedicated control information between the UE and the network and is used by UEs with an RRC connection. The dedicated traffic channel (DTCH) is a point-to-point logical channel dedicated to one UE, which is used to transmit user information. DTCH can exist in both the uplink and downlink. In the downlink, there are the following connections between logical channels and transport channels: BCCH can be mapped to the broadcast channel (BCH); BCCH can be mapped to the downlink shared channel (DL-SCH); PCCH can be mapped to the paging channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH. In the uplink, there are the following connections between logical channels and transport channels: CCCH can be mapped to the uplink shared channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0091] The RLC sublayer supports three transmission modes: transparent mode (TM), unacknowledged mode (UM) and acknowledged mode (AM). RLC configuration is for each logical channel and does not depend on parameter sets and / or transmission duration. In 3GPP NR systems, the main services and functions of the RLC sublayer depend on the transmission mode and include: delivery of upper layer PDUs; sequence numbering independent of one of PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDUs (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

[0092] In the 3GPP NR system, the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using robust header compression (ROHC); transmission of user data; reordering and duplicate detection; in-sequence delivery; PDCP PDU routing (in the case of split bearers); retransmission of PDCP SDU; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status report for RLC AM; duplication of PDCP PDU and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transmission of control plane data; reordering and duplicate detection; in-sequence delivery; duplication of PDCP PDU and duplicate discard indication to lower layers.

[0093] In 3GPP NR system, the main services and functions of SDAP include: mapping between QoS flows and data radio bearers; marking QoS flow ID (QFI) in both DL and UL packets. A single SDAP protocol entity is configured for each individual PDU session.

[0094] 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 RRC connection between 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 reporting; detection and repair of radio link failure; transmission of NAS messages from UE to NAS / from NAS to UE.

[0095] Figure 6 The frame structure in a 3GPP-based wireless communication system to which the implementation of the present disclosure is applied is shown.

[0096] Figure 6The frame structure shown is only exemplary, and the number of subframes, the number of time slots, and / or the number of symbols in a frame may vary. In a 3GPP-based wireless communication system, OFDM parameter sets (e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration) may be configured differently between multiple cells aggregated for one UE. For example, if the UE is configured with different SCSs for cells aggregated for the cells, the (absolute time) duration of time resources (e.g., subframes, time slots, or TTIs) including the same number of symbols may be different among the aggregated cells. In this article, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0097] Reference Figure 6 , downlink and uplink transmissions are organized into frames. Each frame has T f =10ms duration. Each frame is divided into two half-frames, where each half-frame has a duration of 5ms. Each half-frame includes 5 sub-frames, where the duration of each sub-frame is T sf is 1 ms. Each subframe is divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on 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 parameter set is based on an exponentially scalable subcarrier spacing βf=2 u *15kHz.

[0098] Table 3 shows the subcarrier spacing βf=2 u *N is the number of OFDM symbols per slot for normal CP of 15kHz slot symb , the number of time slots per frame N frame，u slot And the number of time slots N in each subframe subframe，u slot .

[0099] [Table 3]

[0100] u <![CDATA[N slot symb ]]> <![CDATA[N framne，u slot ]]> <![CDATA[N subframe，u slot ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 1 60 16

[0101] Table 4 shows the subcarrier spacing βf=2 u *N number of OFDM symbols per slot for extended CP of 15kHz slot symb , the number of time slots per frame N frame，u slot And the number of time slots N in each subframesubframe，u slot .

[0102] [Table 4]

[0103] u <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 2 12 40 4

[0104] A slot includes a plurality of symbols (e.g., 14 or 12 symbols) in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, a common resource block (CRB) N indicated by higher layer signaling (e.g., RRC signaling) is defined. start,u grid Starting N size,u grid,x *N RB sc subcarriers and N subframe,u symb OFDM symbol resource grid, where N size,u grid,x N is the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for the downlink and UL for the uplink. RB sc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, N RB sc Typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL), there is one resource grid. The carrier bandwidth N for subcarrier spacing configuration u size,u grid Given by high-level parameters (e.g., RRC parameters). Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index 1 in the time domain that represents the symbol position relative to a reference point. In a 3GPP-based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain. Figure 6As shown, as the SCS doubles, the slot length and symbol length are halved. For example, when the SCS is 15kHz, the slot length is 1ms, which is the same as the subframe length. When the SCS is 30kHz, the slot length is 0.5ms (=500us), and the symbol length is half of the symbol length when the SCS is 15kHz. When the SCS is 60kHz, the slot length is 0.25ms (=250us), and the symbol length is half of the symbol length when the SCS is 30kHz. When the SCS is 120kHz, the slot length is 0.125ms (=125us), and the symbol length is half of the symbol length when the SCS is 60kHz. When the SCS is 240kHz, the slot length is 0.0625ms (=62.5us), and the symbol length is half of the symbol length when the SCS is 120kHz.

[0105] In 3GPP NR systems, RBs are classified into CRBs and physical resource blocks (PRBs). For subcarrier spacing configuration u, CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB0 for subcarrier spacing configuration u coincides with "point A" used as a common reference point for the resource block grid. In 3GPP NR systems, PRBs are defined within bandwidth parts (BWPs) and are numbered from 0 to N. size BWP,i -1 numbering, where i is the number of bandwidth parts. Physical resource blocks n in bandwidth part i PRB With common resource block n CRB The relationship between them is as follows: PRB =n CRB +N size BWP,i , where N size BWP,i is a common resource block where the bandwidth part starts relative to CRB0. A BWP consists of multiple consecutive RBs. A carrier may include up to N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Only one BWP out of the multiple BWPs configured for a UE may be activated at a time. The active BWP defines the operating bandwidth of the UE within the operating bandwidth of the cell.

[0106] In the present disclosure, the term "cell" may refer to a geographical area where one or more nodes provide a communication system or to a radio resource. A "cell" as a geographical area may be understood as a coverage area in which a node can provide services using a carrier, and a "cell" as a radio resource (e.g., a time-frequency resource) is associated with a bandwidth as a frequency range configured by a carrier. A "cell" associated with a radio resource is defined by a combination of downlink resources and uplink resources (e.g., a combination of a DL component carrier (CC) and a ULCC). A cell may be configured only by downlink resources, or may be configured by downlink resources and uplink resources. Since the DL coverage (which is the range in which a node can send a valid signal) and the UL coverage (which is the range in which a node can receive a valid signal from a UE) depend on the carrier carrying the signal, the coverage of a node may be associated with the coverage of a "cell" of a radio resource used by the node. Therefore, the term "cell" may sometimes be used to represent the service coverage of a node, to represent a radio resource at other times, or to represent a range in which a signal using a radio resource can reach with effective strength at other times.

[0107] In CA, two or more CCs are aggregated. The UE can receive or transmit on one or more CCs simultaneously according to its capabilities. CA is supported for both continuous CCs and non-contiguous CCs. When CA is configured, the UE has only one RRC connection with the network. When the RRC connection is established / reestablished / switched, one serving cell provides NAS mobility information, and when the RRC connection is reestablished / switched, one serving cell provides security input. This cell is called the primary cell (PCell). PCell is a cell operating on the primary frequency, where the UE performs an initial connection establishment process or initiates a connection reestablishment process. Depending on the UE capabilities, the secondary cell (SCell) can be configured to form a set of serving cells together with the PCell. SCell is a cell that provides additional radio resources on top of a special cell (SpCell). Therefore, the set of configured serving cells for the UE always consists of one PCell and one or more SCells. For dual connection (DC) operation, the term SpCell refers to the PCell of the primary cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG). SpCell supports PUCCH transmission and contention-based random access and is always activated. MCG is a group of serving cells associated with a master node, which includes SpCell (PCell) and optionally one or more SCells. For UEs configured with DC, SCG is a subset of serving cells associated with a secondary node, which includes PSCell and zero or more SCells. For UEs in RRC_CONNECTED that are not configured with CA / DC, there is only one serving cell consisting of PCell. For UEs in RRC_CONNECTED that are configured with CA / DC, the term "serving cell" is used to refer to a set of cells consisting of SpCell and all SCells. In DC, two MAC entities are configured in the UE: one for MCG and one for SCG.

[0108] Figure 7 An example of data flow in a 3GPP NR system to which an implementation of the present disclosure is applied is shown.

[0109] Reference Figure 7 , "RB" means radio bearer, and "H" means header. Radio bearers are classified into two groups: DRB for user plane data and SRB for control plane data. MAC PDU is transmitted / received to / from an external device through the PHY layer using radio resources. MAC PDU arrives at the PHY layer in the form of a transport block.

[0110] In the PHY layer, uplink transport channels UL-SCH and RACH are mapped to their physical channels, physical uplink shared channel (PUSCH) and physical random access channel (PRACH), respectively, and 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). The UE sends MAC PDU related to UL-SCH via PUSCH based on UL grant, and the BS sends MAC PDU related to DL-SCH via PDSCH based on DL assignment.

[0111] Hereinafter, cell selection / reselection is described.

[0112] I. Cell Selection Criteria

[0113] When Srxlev>0 and Squal>0, the cell selection criterion S is satisfied. In this paper, Srxlev=Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp And Squal=Q qualmeas -(Q qualmin +Q qualminoffset )-Qoffset temp The parameter definitions are shown in Table 5:

[0114] [Table 5]

[0115]

[0116]

[0117] The signaled value Q is applied only when evaluating cells for cell selection as a result of periodically searching for higher priority PLMNs while normally camped in a VPLMN rxlevminoffset and Q qualminoffset During the periodic search for a higher priority PLMN, the UE may check the S criterion of a cell using parameter values ​​stored from different cells of the higher priority PLMN.

[0118] II. Re-election Priority Processing

[0119] The absolute priority of different NR frequencies or inter-RAT frequencies may be provided to the UE in system information, in the RRCRelease message, or by inheritance from another RAT in inter-RAT cell selection (reselection). In the case of system information, NR frequencies or inter-RAT frequencies may be listed without providing a priority (i.e., the field cellReselectionPriority does not exist for that frequency). If any field with cellReselectionPriority is provided in dedicated signaling, the UE shall ignore any field with cellReselectionPriority and any slice reselection information provided in the system information. If slice reselection information is provided in dedicated signaling, the UE shall ignore the slice reselection information provided in the system information.

[0120] In some implementations, the information provided in the RRCRelease may override the information provided in the SIB. This may include slice specific reselection information, existing / legacy cellResleectionPriority.

[0121] In some implementations, a "PCI list" may be provided in RRCRelease.

[0122] If the UE is in normal resident state and the UE supports slice-based cell reselection, the UE shall derive the reselection priority.

[0123] If the UE is in the camped on any cell state, then unless otherwise specified, the UE shall only apply the priority provided by the system information from the current cell, and the UE retains the priority provided by the deprioritisationReq and dedicated signaling received in the RRCRelease. When the UE in the normal camping state has only a dedicated priority other than for the current frequency, the UE shall regard the current frequency as the lowest priority frequency (i.e., lower than any network configuration value). When a UE with HSDN capability is in a high mobility state, the UE shall always consider the HSDN cell to be the highest priority (i.e., higher than the priority configured by any other network). When a UE with HSDN capability is not in a high mobility state, the UE shall always consider the HSDN cell to be the lowest priority (i.e., lower than the priority configured by any other network). If the UE is configured to perform both NR side link communication and V2X side link communication, the UE may regard the frequency that provides both NR side link communication configuration and V2X side link communication configuration as the highest priority. If the UE is configured to perform NR side link communication and not perform V2X communication, the UE may regard the frequency that provides NR side link communication configuration as the highest priority. If the UE is configured to perform V2X sidelink communication and not to perform NR sidelink communication, the UE may consider the frequency providing the V2X sidelink communication configuration as the highest priority.

[0124] Frequencies that only provide the anchor frequency configuration should not be prioritized for V2X services during cell reselection.

[0125] When the UE is configured to perform cell reselection for NR sidelink communication or V2X sidelink communication, the frequencies provided with intra-carrier and inter-carrier configurations may be considered to have equal priority in the cell reselection.

[0126] The prioritization among the frequencies that the UE considers to be the highest priority frequencies is determined by the UE implementation.

[0127] If the UE has the capability and is authorized for the corresponding sidelink operation, the UE is configured to perform V2X sidelink communication or NR sidelink communication.

[0128] When the UE is configured to perform both NR sidelink communication and V2X sidelink communication, but cannot find a frequency that can provide both NR sidelink communication configuration and V2X sidelink communication configuration, the UE may consider the frequency that provides either the NR sidelink communication configuration or the V2X sidelink communication configuration as the highest priority.

[0129] The UE is configured with a slice or slice group specific frequency priority or dedicated priority in the RRCRelease message.

[0130] The UE shall perform cell reselection evaluation only for NR frequencies and inter-RAT frequencies that are given in the system information and for which the UE has priority provided.

[0131] If a UE with MBS broadcast capability is receiving or is interested in receiving an MBS broadcast service and can only receive the MBS broadcast service by camping on its provided frequency, the UE may consider the frequency as the highest priority during the MBS broadcast session as long as the following two conditions are met:

[0132] 1) The cell that the UE reselects due to frequency prioritization for MBS is providing SIB20;

[0133] 2) Any of the following:

[0134] - one or more MBS FSAIs for that frequency are indicated in the SIB21 of the serving cell, and the same MBS FSAI is also indicated for that MBS broadcast service in the MBS User Service Description (USD), or

[0135] - SIB21 is not set in the serving cell and the frequency is included in the USD of the service, or

[0136] - SIB21 is set in the serving cell, but the frequency mapping for the relevant service is not set, and the frequency is included in the USD of the service.

[0137] How the information in the USD is used to determine whether / how to perform frequency prioritization for a specific frequency included in the USD depends on the UE implementation.

[0138] If a UE with MBS broadcast capability is receiving or is interested in receiving MBS broadcast services, the UE may consider cell reselection candidate frequencies on which it is unable to receive MBS broadcast services as having the lowest priority during the MBS broadcast session, as specified in TS 38.300 [2], as long as the cells on the MBS frequencies monitored by the UE provide SIB20 and as long as condition 2) above is satisfied for the serving cell.

[0139] In the event that the UE receives a RRCRelease with deprioritisationReq, regardless of the RAT it is camping on, while T325 is running, the UE shall treat the frequencies stored due to the previously received RRCRelease with deprioritisationReq and the current frequency or all frequencies of the NR as the lowest priority frequencies (i.e., lower than any network configured value). When performing PLMN selection or SNPN selection at the request of NAS, the UE shall delete the stored deprioritization request.

[0140] The UE shall search for a higher priority layer for cell reselection as soon as possible after the priority change. The minimum relevant performance requirements still apply.

[0141] The UE shall delete the priority level provided by dedicated signalling in the following cases:

[0142] - the UE enters a different RRC state; or

[0143] - the optional validity time (T320) of the dedicated priority level has expired; or

[0144] - The UE receives a RRCRelease message with the cellReselectionPriorities field missing; or

[0145] -Perform PLMN selection or SNPN selection based on the request of NAS.

[0146] The UE shall not consider any list-excluded cells as candidates for cell reselection.

[0147] The UE shall only consider list allowed cells (if configured) as candidates for cell reselection.

[0148] A UE in RRC_IDLE state shall inherit the priority and remaining validity time (i.e., T320 in NR and E-UTRA) set by dedicated signaling at the time of inter-RAT cell selection (reselection), if configured.

[0149] The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

[0150] III. Inter-frequency and inter-RAT cell reselection criteria

[0151] If threshServingLowQ is broadcasted in system information and more than 1 second has passed since the UE camped on the current serving cell, then if a cell with higher priority NR or EUTRAN RAT / frequency is RAT During the period, Squal>Thresh X,HighQ , cell reselection should be performed to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency.

[0152] Otherwise, if i) in the time interval Treselection RAT During this period, the cell with higher priority RAT / frequency satisfies Srxlev>Thresh X,HighP; and ii) more than 1 second has passed since the UE camped on the current serving cell, cell reselection should be performed to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency.

[0153] Cell reselection to cells on equal priority NR frequencies shall be based on the ranking for intra-frequency cell reselection.

[0154] If threshServingLowQ is broadcast in the system information and more than 1 second has passed since the UE camped on the current serving cell, then if the serving cell satisfies Squal <Thresh Serving,LowQ , and in the time interval Treselection RAT During this period, the cells with lower priority NR or E-UTRAN RAT / frequency meet Squal>Thresh X,LowQ , cell reselection should be performed to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency.

[0155] Otherwise, if i) the serving cell satisfies Srxlev <Thresh Serving,LowP , and in the time interval Treselection RAT During this period, the cell with lower priority RAT / frequency satisfies Srxlev>Thresh X,LowP ; and ii) more than 1 second has passed since the UE camped on the current serving cell, cell reselection should be performed to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency.

[0156] For a UE performing slice-based cell reselection, if a cell meets the above criteria for cell reselection based on frequency and slice group reselection priority, but the cell does not support slice groups, the UE shall re-derive the reselection priority for frequency by considering the slice groups supported by the cell (instead of the slice groups corresponding to the NR frequency). This reselection priority shall be used until the highest ranked cell changes in frequency or a new slice or slice group priority is received from the NAS. The UE shall ensure that the above cell reselection criteria are met based on the newly derived priorities.

[0157] If multiple cells of different priorities meet the cell reselection criteria, cell reselection to a higher priority RAT / frequency will take precedence over a lower priority RAT / frequency.

[0158] If more than one cell meets the above criteria, the UE should reselect a cell if the highest priority frequency is an NR frequency, the highest ranked cell among the cells on the highest priority frequency meets the criteria according to the clause; and / or if the highest priority frequency is from another RAT, the strongest cell among the cells on the highest priority frequency meets the criteria of that RAT.

[0159] IV. Intra-frequency and equal-priority inter-frequency cell reselection criteria

[0160] The cell ranking criterion R for the serving cell s and R for neighboring cells n Defined by: R s =Q meas,s +Q hyst -Qoffset temp ; and R n =Q meas,n -Qoffset-Qoffset temp The parameter definitions are shown in Table 6:

[0161] [Table 6]

[0162]

[0163] The UE shall perform ranking on all cells that meet the cell selection criterion S. According to the R criterion specified above, by deriving Q meas,n and Q meas,s The average RSRP results are used to calculate the R value to rank the cells.

[0164] If rangeToBestCell is not configured, the UE shall perform cell reselection to the highest ranked cell. If the cell is found to be unsuitable, the UE shall not consider this cell and other cells operating on the same frequency as the candidate for reselection in the licensed spectrum for a maximum of 300 seconds.

[0165] If rangeToBestCell is configured, 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 within rangeToBestCell of the highest ranked cell. If there are multiple such cells, the UE shall perform cell reselection to the highest ranked cell among them. If the cell is found to be unsuitable, the UE shall not consider this cell and other cells operating on the same frequency as candidates for reselection in the licensed spectrum for a maximum of 300 seconds.

[0166] In all cases, only if i) the new cell is in the time interval TreselectionRAT The UE should reselect a new cell only if ii) the UE is better than the serving cell according to the cell reselection criteria specified above; and / or ii) more than 1 second has passed since the UE camped on the current serving cell.

[0167] If rangeToBestCell is configured on an NR frequency but absThreshSS-BlocksConsolidation is not configured, the UE considers that there is one beam above the threshold for each cell on that frequency.

[0168] In addition, there may be a cell reselection scenario in which there is a cell installed in a mobile object as shown below:

[0169] 1) Scenario 1 (S1): Non-carrying UE reselects a temporarily close mobile cell

[0170] -S1-1: A stationary non-carrying UE reselects a nearby mobile cell.

[0171] -S1-1: The mobile non-carrying UE reselects a nearby mobile cell.

[0172] 2) S2: The UE carried inside the mobile IAB node reselects other cells except the mobile cell

[0173] - S2-1: When the mobile IAB node is moving, the UE (stationary or mobile) is piggybacked to reselect cells other than the mobile cell.

[0174] - S2-2: The mobile IAB node is temporarily stationary and the piggybacked UE will reselect a cell other than the mobile cell.

[0175] In S1, a non-piggybacked UE may make unnecessary reselections to a mobile cell. In S2, a piggybacked UE may make unnecessary reselections to cells other than the mobile cell.

[0176] Unnecessary reselections in S1 can be easily avoided by configuring the mobile cell with a lower cell reselection frequency priority (CRP) value. The CRP configuration may depend on the network implementation and no new mechanism is required.

[0177] However, configuring a lower CRP for mobile cells does not solve the problem in S2. Instead, it worsens the problem in S2 because the piggybacked UE will attempt to measure and reselect other cells (e.g., other stationary cells) with higher CRP.

[0178] To avoid the problem in S2, the piggybacked UE should be able to attach to the current mobile cell as long as the current mobile cell provides reasonable signal quality and the UE is indeed piggybacked in the mobile cell. A possible means to enable the UE to attach to the current mobile cell would be to prioritize the mobile cell over other cells with respect to cell reselection.

[0179] In order to prioritize the cell over other inter-frequency cells, the piggybacked UE may be allowed to consider the CRP of the mobile cell frequency as the highest CRP if the combined priority conditions given below are met.

[0180] In order to prioritize the cell over other intra-frequency cells, the piggyback UE may be allowed to apply a positive cell specific offset to the mobile cell if the combined priority conditions given below are met.

[0181] According to various embodiments, the merging priority condition for the cell may include at least one of a minimum cell quality condition, a mobile cell identification condition, a real-time mobility state condition, or a relative mobility state condition. If the merging condition is met, the UE may prioritize the cell / frequency.

[0182] 1. Minimum cell quality conditions

[0183] The minimum cell quality condition is a condition that the quality of a cell is higher than a minimum cell quality (ie, a threshold value). If the minimum cell quality condition is not applied, the UE may prioritize cells with very low signal quality, which is undesirable.

[0184] 2. Mobile cell identification conditions

[0185] The mobile cell identification condition is a condition for identifying a related cell as a mobile cell.

[0186] The indication of whether a cell is a mobile cell may be signaled via:

[0187] - Neighbor cell information (i.e., System Information Block 3 (SIB3) and / or SIB4); and / or

[0188] - Serving cell information (ie, SIB1).

[0189] This indication does not mean that the cell is currently moving or not moving. This indication may only indicate that the cell may potentially move (ie, the cell can potentially move / the cell has the ability to move). That is, a mobile cell may be a cell that can move, regardless of actual movement.

[0190] If the mobile cell identification condition is not applied, the UE may prioritize cells without mobility capability, which is undesirable.

[0191] 3. Real-time mobility status conditions

[0192] The real-time mobility state condition is a condition that the real-time mobility state of the relevant cell is a mobile state (i.e., the cell is currently moving). The UE may receive mobility state information indicating whether the cell is in a mobile state (i.e., currently moving) or a stationary state (i.e., currently not moving) from the cell via broadcast / dedicated signaling. That is, the mobility state information may indicate the mobility state of the cell (e.g., mobile state or stationary state), and / or whether the cell is currently moving or the cell is currently stationary (i.e., not moving / in a stationary state).

[0193] When the UE is camped on a cell, the UE may obtain the real-time mobility status of the cell. The UE may apply the real-time mobility status condition only when the UE is currently camped on the cell. That is, if the real-time mobility status condition is applied, the UE may prioritize the current serving cell / frequency only if the current serving cell is indicated as "moving" and other applicable conditions are also met.

[0194] If the real-time mobility state condition is not applied, the UE may prioritize the currently stationary cell. This result may be acceptable if the stationary time is long enough. On the other hand, if the real-time mobility state condition is applied, a UE that has been onboard a mobile cell but is now leaving the mobile cell may remain stationed on the mobile cell longer than necessary. Then, by signaling a control flag in the SIB for this purpose along with the real-time mobility state of the cell, it may be beneficial to give network control whether the UE should apply / evaluate the real-time mobility state condition as a necessary condition for prioritizing the cell / frequency. Alternatively, the real-time mobility state condition may not be used in the merge condition.

[0195] 4. Relative mobility state conditions

[0196] The relative mobility state condition is a condition that the relative mobility state between the UE and the relevant cell is low / stationary. When the change in the measured signal quality of the cell over time is small enough and / or the time average of the measured signal quality of the cell remains almost the same over time and / or the time average of the measured signal quality of the cell changes within a given constant, the relative mobility state between the UE and the cell can be determined to be low / stationary.

[0197] For example, when a change in measured signal quality of a cell during an operational but fixed-size duration is below a threshold, the relative mobility state between the UE and the cell may be determined to be low / stationary.

[0198] For example, when the change in the average value of the measured signal quality of the cell during a running but fixed-size duration is below a threshold, the relative mobility state between the UE and the cell may be determined to be low / stationary.

[0199] If the thresholds are configured appropriately, a mobile UE within a mobile cell may still consider the mobile cell to be in a relatively low / stationary state.

[0200] If the relative mobility state condition does not apply, the UE may prioritize cells that do not carry the UE.

[0201] If the relative mobility state between the cell and the UE is determined based on radio quality measurements and / or positioning measurements, and the relative mobility state is low / stationary (ie, a relatively stationary state), it is likely that the UE is actually piggybacked in the cell.

[0202] If the non-piloted UE applies the relative mobility state condition, the relative mobility state between the UE and the mobile cell moving nearby can be observed to be not a low / stationary mobility state (ie, a relative mobile state). Then, the non-piloted UE can avoid prioritizing the cell.

[0203] FIG. 8A to FIG. 8E An example of an Srxlev diagram related to the relative mobility state between a UE and a cell according to an embodiment of the present disclosure is shown. In the present disclosure:

[0204] -Srxlev can be replaced by the signal quality of the relevant cell;

[0205] - the change in Srxlev for a cell during a time period may be the difference between a maximum value of Srxlev for a cell and a minimum value of Srxlev for a cell during the time period; and / or

[0206] - The average value of Srxlev for a cell during the time period may be a moving average value of Srxlev for a cell during the time period.

[0207] Reference Fig. 8A , the change of Srxlev for the cell is small during the time period, and the average value of Srxlev for the cell is almost constant during the time period. In this case, the UE may determine the relative mobility state between the UE and the cell as low / stationary, and / or determine that the UE is piggybacked in the cell.

[0208] Reference Figure 8B, the change of Srxlev for the cell is small during the time period, but the average value of Srxlev for the cell increases linearly with a large gradient during the time period. In this case, the UE may determine the relative mobility state between the UE and the cell as not low / stationary, and / or determine that the UE is not mounted in the cell.

[0209] Reference Figure 8C , the change of Srxlev for the cell is small during the time period, but the average value of Srxlev for the cell decreases linearly with a large gradient during the time period. In this case, the UE may determine the relative mobility state between the UE and the cell as not low / stationary, and / or determine that the UE is not mounted in the cell.

[0210] Reference Fig.8D , the change of Srxlev for the cell is small during the time period, and the average value of Srxlev for the cell increases linearly with a small gradient during the time period. In this case, the UE may determine the relative mobility state between the UE and the cell as low / stationary, and / or determine that the UE is piggybacked in the cell. This situation may correspond to a situation where the UE moves within a cell (i.e., a mobile cell).

[0211] Reference Fig. 8E , the change of Srxlev for the cell is small during a time period, and the average value of Srxlev for the cell decreases linearly with a small gradient during the time period. In this case, the UE may determine the relative mobility state between the UE and the cell as low / stationary, and / or determine that the UE is piggybacked in the cell. This situation may correspond to a situation where the UE moves within a cell (i.e., a mobile cell).

[0212] Fig. 9 An example of a method performed by a UE according to an embodiment of the present disclosure is shown. The method may also be performed by a wireless device.

[0213] Reference Fig. 9 , in step S901, the UE may identify cells whose quality is higher than a quality threshold.

[0214] At step S903, the UE may prioritize cells for cell reselection based on i) receiving system information notifying that the cells are mobile cells and ii) relative mobility states between the UE and the cells.

[0215] In step S905 , the UE may perform cell reselection to one of the cells including the priority cell.

[0216] According to various embodiments, the UE may prioritize a cell over other inter-frequency cells by setting the priority of the frequency where the cell exists to be highest.

[0217] According to various embodiments, the UE may prioritize a cell over other intra-frequency cells by adding a positive offset value to the cell's cell ranking value.

[0218] According to various embodiments, the UE may perform cell reselection to a cell having a highest cell ranking value on a frequency having the highest priority.

[0219] According to various embodiments, a mobile cell may be a cell that is capable of movement regardless of actual movement.

[0220] According to various embodiments, the system information may include at least one of a system information block (SIB) related to neighbor cell information or a SIB related to serving cell information.

[0221] According to various embodiments, the SIB related to the neighbor cell information may include at least one of SIB3 or SIB4. The SIB related to the serving cell information may include SIB1.

[0222] According to various embodiments, the UE may receive information notifying the mobility state of the cell. The mobility state may include at least one of a mobile state in which the cell is currently moving or a stationary state in which the cell is currently not moving. The UE may prioritize the cell for cell reselection based on the mobility state of the cell being a mobile state.

[0223] According to various embodiments, the UE may receive control signaling indicating to evaluate the mobility status of cells to prioritize the cells.

[0224] According to various embodiments, the UE may evaluate the mobility states of cells to prioritize cells based on currently camping on the cells.

[0225] According to various embodiments, the UE may evaluate the mobility status of cells to prioritize cells on which the UE is not currently camped.

[0226] According to various embodiments, the relative mobility state may include at least one of a relatively mobile state or a relatively stationary state. The cells may be prioritized based on the relative mobility state being a relatively stationary state.

[0227] According to various embodiments, the relative mobility state may be determined to be a relative static state based on the UE being piggybacked in an object associated with a cell.

[0228] According to various embodiments, the UE may measure the signal quality for the cell during the time period. The UE may determine a moving average of the signal quality during the time period. The relatively stationary state may include at least one of the following: a state in which the difference between the maximum value of the signal quality and the minimum value of the signal quality during the time period is less than a first threshold; or a state in which the absolute gradient of the moving average of the signal quality during the time period is lower than a second threshold. The relatively mobile state may include at least one of the following: a state in which the difference between the maximum value of the signal quality and the minimum value of the signal quality during the time period is greater than a first threshold; or a state in which the absolute gradient of the moving average of the signal quality during the time period is higher than a second threshold.

[0229] According to various embodiments, the UE may identify a first state to determine whether the quality of the cell exceeds a threshold. The UE may identify a second state to determine whether the cell is a mobile cell. The UE may identify a third state to determine that the cell is currently moving. The UE may identify a fourth state to determine whether the relative mobility state between the UE and the cell is low or stationary. The UE may prioritize the cell for cell reselection based on the identified state. Prioritization may be based on applying the cell reselection priority of the cell as the highest value or applying an offset to the cell.

[0230] Fig.10 An example of a signal flow between a network node and a UE according to an embodiment of the present disclosure is shown. The network node may include a base station (BS).

[0231] Reference Fig.10 In step S1001, the network node may send system information to the UE to notify that the cell is a mobile cell.

[0232] In step S1003, the network node may send information on cell reselection parameters to the UE. For example, the cell reselection parameters may include at least one of a priority of a frequency associated with a cell or a cell ranking offset value.

[0233] In some implementations, step S1001 and step S1003 may be performed simultaneously. For example, information on cell reselection parameters may be included in system information, or sent together with information notifying that the cell is a mobile cell. As another example, the order of performing step S1001 and step S1003 may be changed.

[0234] In step S1005, the UE may identify that the quality of the cell is higher than a quality threshold.

[0235] At step S1007 , the UE may prioritize cells for cell reselection based on i) receiving system information notifying that the cells are mobile cells and ii) relative mobility states between the UE and the cells.

[0236] In step S1009 , the UE may perform cell reselection to one of the cells including the priority cell.

[0237] In addition, in the present disclosure (for example, Fig. 9 The method described from the perspective of the UE can be Figure 2 The first wireless device 100 and / or Figure 3 The UE 100 shown in FIG.

[0238] More specifically, the UE includes at least one transceiver, at least one processor, and at least one computer memory operatively connected to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor.

[0239] The operations include: identifying cells having quality above a quality threshold; prioritizing cells for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) relative mobility states between the UE and the cells; and performing cell reselection to one of the cells including the priority cells.

[0240] In addition, in this disclosure (for example, Fig. 9 The method described from the perspective of the UE can be stored in Figure 2 The first wireless device 100 is shown to be executed by software code 105 in the memory 104 included in the first wireless device 100.

[0241] More specifically, at least one computer readable medium (CRM) stores instructions that, based on being executed by at least one processor, perform operations including: identifying cells having a quality higher than a quality threshold; prioritizing cells for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) a relative mobility state between a UE and the cell; and performing cell reselection to one of the cells including the priority cell.

[0242] In addition, in this disclosure (for example, Fig. 9 The method described from the perspective of the UE can be Figure 2 The processor 102 included in the first wireless device 100 shown is controlled and / or Figure 3 The processing is executed under the control of the processor 102 included in the UE 100 shown.

[0243] More specifically, an apparatus configured / adapted to operate in a wireless communication system (e.g., a wireless device / UE) includes at least one processor and at least one computer memory operatively connectable to the at least one processor. The at least one processor is configured / adapted to perform operations, including: identifying cells with quality above a quality threshold; prioritizing cells for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) relative mobility states between the UE and the cell; and performing cell reselection to one of the cells including the priority cell.

[0244] In addition, in the present disclosure (for example, Fig.10 The method described from the perspective of network nodes can be Figure 2 The second wireless device 200 shown in FIG.

[0245] More specifically, the network node includes at least one transceiver, at least one processor, and at least one computer memory operatively connected to the at least one processor and storing instructions that perform operations upon execution by the at least one processor.

[0246] The operations include: sending system information notifying that a cell is a mobile cell to a user equipment (UE); and sending information for a cell reselection parameter to the UE, wherein the UE is configured to: identify that the quality of the cell is above a quality threshold; prioritize the cell for cell reselection based on i) receiving the system information notifying that the cell is a mobile cell; and ii) a relative mobility state between the UE and the cell; and perform cell reselection to one of the cells including the priority cell.

[0247] The present disclosure may have various beneficial effects.

[0248] For example, the UE prioritizes the current serving cell that meets the merging condition so that the UE can remain camped on the cell.

[0249] For example, the UE prioritizes neighbor cells that meet the merging condition so that the UE can reselect cells.

[0250] For example, a piggybacked UE in a mobile cell may avoid unnecessary cell reselection, and / or a non-piggybacked UE may avoid unnecessary reselection.

[0251] The beneficial effects that can be obtained by the specific embodiments of the present disclosure are not limited to the beneficial effects listed above. For example, there may be various technical effects that can be understood by a person skilled in the relevant art and / or derived from the present disclosure. Therefore, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that can be understood or derived from the technical features of the present disclosure.

[0252] The claims in this disclosure may be combined in various ways. For example, the technical features in the method claims of this disclosure may be combined to be implemented or performed in a device, and the technical features in the device claims may be combined to be implemented or performed in a method. In addition, the technical features in the method claims and the device claims may be combined to be implemented or performed in a device. In addition, the technical features in the method claims and the device claims may be combined to be implemented or performed in a method. Other implementations are within the scope of the appended claims.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising the following steps: Identify cells whose quality is above a quality threshold; Based on i) receiving system information notifying that the cell is a mobile cell from the network; and ii) a relative mobility state between the UE and the cell, prioritizing the cell for cell reselection; as well as Cell reselection to one of the cells including the priority cell is performed.

2. The method according to claim 1, wherein: The step of prioritizing the cell includes giving priority to the cell over other inter-frequency cells by setting the priority of the frequency where the cell exists to be the highest.

3. The method according to claim 1, wherein: The step of prioritizing the cell comprises prioritizing the cell over other intra-frequency cells by adding a cell ranking value of the cell to a positive offset value.

4. The method according to claim 1, wherein: The step of performing the cell reselection includes performing cell reselection to a cell having a highest cell ranking value at a frequency having a highest priority.

5. The method according to claim 1, wherein: The mobile cell is a cell that is capable of movement regardless of actual movement.

6. The method according to claim 1, wherein: The system information includes at least one of a system information block SIB related to neighbor cell information or a SIB related to serving cell information.

7. The method according to claim 1, wherein: The SIB related to the neighbor cell information includes at least one of SIB3 or SIB4, and Among them, the SIB related to the serving cell information includes SIB1.

8. The method according to claim 1, further comprising the steps of: receiving information informing about the mobility state of the cell, The mobility state includes at least one of a moving state in which the cell is currently moving or a stationary state in which the cell is currently not moving, and Therein, the step of prioritizing the cell for cell reselection includes prioritizing the cell for cell reselection based on the mobility state of the cell being the mobility state.

9. The method according to claim 8, further comprising the steps of: Control signaling is received, the control signaling instructing to evaluate the mobility states of the cells to prioritize the cells.

10. The method according to claim 8, further comprising the steps of: The mobility states of the cells are evaluated to prioritize the cells based on currently camping on the cells.

11. The method according to claim 8, further comprising the steps of: The mobility states of the cells are evaluated to prioritize the cells on which the UE is not currently camped.

12. The method according to claim 1, wherein: The relative mobility state comprises at least one of a relative moving state or a relative stationary state, and The cells are prioritized based on the relative mobility state being the relative stationary state.

13. The method according to claim 12, wherein: The relative mobility state is determined to be the relative stationary state based on the UE being piggybacked in an object associated with the cell.

14. The method according to claim 12, further comprising the steps of: measuring a signal quality for the cell during a time period; and determining a moving average of said signal quality during said time period, The relatively static state includes at least one of the following: A state in which a difference between a maximum value of the signal quality and a minimum value of the signal quality during the time period is smaller than a first threshold; or A state in which an absolute gradient of the moving average value of the signal quality during the time period is lower than a second threshold; and The relative movement state includes at least one of the following items: A state in which a difference between the maximum value of the signal quality and the minimum value of the signal quality during the time period is greater than the first threshold; or A state in which an absolute gradient of the moving average value of the signal quality during the time period is higher than the second threshold.

15. The method according to claims 1 to 14, wherein: The UE communicates with at least one of a mobile device, a network, or an autonomous vehicle.

16. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one memory operatively coupled to the at least one processor and storing instructions, the instructions performing operations upon execution by the at least one processor, the operations comprising: Identify cells whose quality is above a quality threshold; prioritizing the cell for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) a relative mobility state between the UE and the cell; and Cell reselection to one of the cells including the priority cell is performed.

17. The UE according to claim 16, wherein: The UE is arranged to implement the method according to one of claims 2 to 15.

18. A network node configured to operate in a wireless communication system, the network node comprising: at least one transceiver; at least one processor; as well as at least one memory operatively coupled to the at least one processor and storing instructions, the instructions performing operations upon execution by the at least one processor, the operations comprising: Sending system information notifying that the cell is a mobile cell to the user equipment UE; and sending information on cell reselection parameters to the UE, The UE is configured as follows: Identify that the quality of the cell is higher than a quality threshold; prioritizing the cell for cell reselection based on i) receiving the system information notifying that the cell is the mobile cell; and ii) a relative mobility state between the UE and the cell; and Cell reselection to one of the cells including the priority cell is performed.

19. A method performed by a network node configured to operate in a wireless communication system, the method comprising the steps of: Sending system information to user equipment UE to notify that the cell is a mobile cell; as well as sending information on cell reselection parameters to the UE, The UE is configured as follows: Identify that the quality of the cell is higher than a quality threshold; prioritizing the cell for cell reselection based on i) receiving the system information notifying that the cell is the mobile cell; and ii) a relative mobility state between the UE and the cell; and Cell reselection to one of the cells including the priority cell is performed.

20. The method according to claim 19, wherein: The UE is arranged to implement the method according to one of claims 1 to 15.

21. A device adapted to operate in a wireless communication system, the device comprising: at least one processor; as well as at least one memory operatively coupled to the at least one processor and storing instructions, the instructions performing operations upon execution by the at least one processor, the operations comprising: Identify cells whose quality is above a quality threshold; prioritizing the cell for cell reselection based on i) receiving system information notifying that the cell is a mobile cell; and ii) a relative mobility state between the UE and the cell; and Cell reselection to one of the cells including the priority cell is performed.

22. A non-transitory computer readable medium (CRM) having stored thereon program code implementing instructions, wherein the instructions are executed by at least one processor to perform operations, the operations comprising: Identify cells whose quality is above a quality threshold; Based on i) receiving system information notifying that the cell is a mobile cell; and ii) relative mobility status between the UE and said cells, prioritizing said cells for cell reselection; as well as Cell reselection to one of the cells including the priority cell is performed.

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