Cell state based mobility control in wireless communication system

Abstract

The invention relates to cell state based mobility control in wireless communications. 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: receiving information for a plurality of mobility conditions for a target cell, each of the plurality of mobility conditions relating to a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition related to the at least one cell state among the plurality of mobility conditions; and performing mobility to the target cell on the basis of satisfying a mobility condition among the at least one mobility condition.

Description

Technical Field

[0001] The present disclosure relates to cell state-based mobility control in wireless communication. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a technology that enables high-speed packet communication. Many solutions have been proposed for LTE objectives, including those aimed at reducing user and provider costs, improving quality of service, and expanding and improving coverage and system capacity. As an upper layer requirement, 3GPP LTE needs to reduce cost per bit, increase service availability, flexibly use frequency bands, have a simple structure, open interfaces, and appropriate power consumption of terminals.

[0003] The International Telecommunication Union (ITU) and 3GPP have started to develop requirements and specifications for a New Radio (NR) system. 3GPP must identify and develop the technical components required for successful standardization of a new Radio Access Technology (RAT) that will meet both immediate market needs and the 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 in the at least up to 100 GHz range that will be available for wireless communication even in the more distant future.

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

[0005] In wireless communication, a User Equipment (UE) can perform mobility to obtain services from a better cell. For example, the UE can perform cell reselection in the idle / inactive mode and handover in the connected mode. To perform mobility to a better cell, the cell state can be considered. Summary of the Invention

[0006] Technical Solution

[0007] One aspect of the present disclosure is to provide a method and an apparatus for prioritizing mobility control based on cell state 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 steps of: receiving information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

[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 that is operatively coupled to the at least one processor and stores instructions that, when executed by the at least one processor, perform operations including: being associated with a corresponding cell state among cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

[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 that is operatively coupled to the at least one processor and stores instructions that, when executed by the at least one processor, perform operations including: sending to a user equipment (UE) information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; and sending to the UE information for at least one cell state among the plurality of cell states, wherein at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state is evaluated, and wherein mobility to the target cell is performed based on satisfying the mobility condition among the at least one mobility condition.

[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: sending, to a user equipment (UE), information regarding a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; and sending, to the UE, information regarding at least one cell state among the plurality of cell states, wherein at least one mobility condition associated with the at least one cell state is evaluated among the plurality of mobility conditions, and wherein mobility to the target cell is performed based on a mobility condition among the at least one mobility condition being satisfied.

[0012] According to one embodiment of the present disclosure, an apparatus adapted to operate in a wireless communication system includes: at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations including: receiving information regarding a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information regarding at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on a mobility condition among the at least one mobility condition being satisfied.

[0013] According to one embodiment of the present disclosure, a non-transitory computer-readable medium (CRM) stores program code implementing instructions that, when executed by at least one processor, perform operations including: receiving information regarding a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information regarding at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on a mobility condition among the at least one mobility condition being satisfied.

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

[0015] For example, when a base station associated with a cell operates multiple NES states, the UE can evaluate the mobility conditions associated with the NES state for the cell to enter for optimal mobility.

[0016] The beneficial effects that can be obtained through 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 and / or derived from the present disclosure by those of ordinary skill in the relevant art. 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

[0017] Figure 1 An example of a communication system applying an implementation of the present disclosure is shown.

[0018] Figure 2 An example of a wireless device applying an implementation of the present disclosure is shown.

[0019] Figure 3 An example of a UE applying an implementation of the present disclosure is shown.

[0020] Figure 4 And Figure 5 An example of a protocol stack in a 3GPP-based wireless communication system applying an implementation of the present disclosure is shown.

[0021] Figure 6 An example of a frame structure in a 3GPP-based wireless communication system applying an implementation of the present disclosure is shown.

[0022] Figure 7 An example of a data flow in a 3GPP NR system applying an implementation of the present disclosure is shown.

[0023] Figure 8 An example of a conditional handover process to which the technical features of the present disclosure can be applied is shown.

[0024] Figure 9 An example of a method performed by a UE according to an embodiment of the present disclosure is shown.

[0025] Figure 10 An example of a method performed by a network node according to an embodiment of the present disclosure is shown.

[0026] Figure 11 An example of adjusting reselection parameters according to cell status according to an embodiment of the present disclosure is shown.

[0027] Figure 12 An example of adjusting execution conditions for conditional mobility according to cell status according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following technologies, 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 the Universal Mobile Telecommunications System (UMTS). The Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of the Evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE employs OFDMA in the downlink (DL) and SC-FDMA in the uplink (UL). The evolution of 3GPP LTE includes LTE-Advanced (LTE-A), LTE-A Pro, and / or 5G New Radio (NR).

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

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

[0031] In the present disclosure, "A or B" can mean "only A", "only B", or "both A and B". In other words, "A or B" in the present disclosure can be interpreted as "A and / or B". For example, "A, B, or C" in the present disclosure can 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 (,) can mean "and / or". For example, "A / B" can represent "A and / or B". Thus, "A / B" can represent "only A", "only B", or "both A and B". For example, "A, B, C" can 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". Additionally, 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 the same as "at least one of A and B".

[0034] Additionally, 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". Additionally, "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] Additionally, the parentheses used in the present disclosure may mean "for example". Specifically, when shown as "control information (PDCCH)", "PDCCH" may be cited as an example of "control information". In other words, "control information" in the present disclosure is not limited to "PDCCH", and "PDCCH" may be cited as an example of "control information". Additionally, even when shown as "control information (i.e., PDCCH)", "PDCCH" may be cited as an example of "control information".

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

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

[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 merely exemplary, and the technical features of the present disclosure may be applied to Figure 1 other 5G usage scenarios not shown.

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

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

[0043] The BS 200 and the network 300 can be implemented as wireless devices, and a specific wireless device can operate as a BS / network node with respect to other wireless devices.

[0044] The wireless devices 100a to 100f represent devices that perform communication using radio access technology (RAT) (e.g., 5G NR or LTE), and can be referred to as communication / radio / 5G devices. The wireless devices 100a to 100f can include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a household appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle can include a vehicle with wireless communication capabilities, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. The vehicle can include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device can include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and can be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a TV, a smart phone, a computer, a wearable device, a household appliance device, a digital sign, a vehicle, a robot, etc. The handheld device can include a smart phone, a smart tablet, a wearable device (e.g., a smart watch or smart glasses), and a computer (e.g., a notebook). The household appliance can include a TV, a refrigerator, and a washing machine. The IoT device can include sensors and smart meters.

[0045] In the present disclosure, the wireless devices 100a to 100f can be referred to as user equipment (UE). The UE can 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 slate personal computer (PC), a tablet PC, a superbook, a vehicle, a vehicle with autonomous driving capabilities, a connected car, a UAV, an AI module, a robot, an AR device, a VR device, an MR device, a holographic device, a public safety device, an MTC device, an IoT device, a medical device, a FinTech device (or financial device), a security device, a weather / environment device, a device related to 5G services, or a device related to the fourth industrial revolution field.

[0046] Wireless devices 100a to 100f can be connected to network 300 via BS200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can be connected to AI server 400 via network 300. Network 300 can be configured using 3G network, 4G (e.g., LTE) network, 5G (e.g., NR) network, and super 5G network. Although wireless devices 100a to 100f can communicate with each other via BS200 / network 300, wireless devices 100a to 100f can perform direct communication (e.g., sidelink communication) with each other without going through BS200 / network 300. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0047] Wireless communications / connections 150a, 150b, and 150c can be established between wireless devices 100a to 100f and / or between wireless devices 100a to 100f and BS200 and / or between BS200s. Here, the wireless communications / connections can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, and inter-base-station communication 150c (e.g., relay, integrated access and backhaul (IAB)). Wireless devices 100a to 100f and BS200 / wireless devices 100a to 100f can send radio signals to / from each other through wireless communications / connections 150a, 150b, and 150c. For example, wireless communications / connections 150a, 150b, and 150c can send / receive signals through various physical channels. To this end, at least a part of various configuration information configuration processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for sending / receiving radio signals can be performed based on various proposals of the present disclosure.

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

[0049] NR frequency bands can 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 can be changed. For example, the frequency ranges of the two types (FR1 and FR2) can be as shown in Table 1 below. For ease of explanation, in the frequency ranges used in the NR system, FR1 can represent "the range below 6 GHz", FR2 can represent "the range above 6 GHz", and can 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 values of the frequency ranges of the NR system can be changed. For example, FR1 can include the frequency band from 410 MHz to 7125 MHz as shown in Table 2 below. That is, FR1 can include a frequency band of 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or higher. For example, the frequency band of 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or greater included in FR1 can include unlicensed frequency bands. The unlicensed frequency bands can be used for various purposes, such as communication for 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 technologies implemented in the wireless devices in the present disclosure may include narrowband Internet of Things (NB-IoT) technologies for low-power communication as well as LTE, NR, and 6G. For example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the above names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology. For example, the LTE-M technology may be an example of an LPWAN technology and may be referred to by various names such as enhanced machine type communication (eMTC). For example, the 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 technologies implemented in the wireless devices 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, the 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 by various names. Figure 2 An example of a wireless device to which an implementation of the present disclosure is applied is shown.

[0056] In Figure 2 the first wireless device 100 and / or the second wireless device 200 may be implemented in various forms according to usage / services. 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 (e.g., transceiver 106), at least one processing chip (e.g., processing chip 101), and / or one or more antennas 108.

[0058] The processing chip 101 may include at least one processor (e.g., processor 102) and at least one memory (e.g., 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 operation flowcharts described in the present disclosure. For example, the processor 102 may process the information within the memory 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal through the transceiver 106. The processor 102 may receive a radio signal including a second information / signal through the transceiver 106, and then store the information obtained by processing the second information / signal 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, which implements codes, commands, and / or command sets that, when executed by the processor 102, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in the present disclosure. For example, the firmware and / or software code 105 may implement instructions that, when executed by the processor 102, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts 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 radio interface protocols.

[0061] Herein, 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 the 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 (e.g., transceiver 206), at least one processing chip (e.g., processing chip 201), and / or one or more antennas 208.

[0063] The processing chip 201 may include at least one processor (e.g., processor 202) and at least one memory (e.g., 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 operation flowcharts described in the present disclosure. For example, the processor 202 may process the information within the memory 204 to generate third information / signals, and then transmit radio signals including the third information / signals via the transceiver 206. The processor 202 may receive radio signals including fourth information / signals via the transceiver 106, and then store the 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, which implements codes, commands, and / or command sets that, when executed by the processor 202, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in the present disclosure. For example, the firmware and / or software code 205 may implement instructions that, when executed by the processor 202, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts 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 radio interface protocols.

[0066] In this document, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals via 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 the RF unit. In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0067] In the following, the hardware components of 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 media 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 flowcharts disclosed in the present disclosure. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in the present disclosure and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in the present disclosure.

[0068] One or more processors 102 and 202 may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. 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, an application processor (AP), an electronic control unit (ECU), a central processing unit (CPU), a graphics processing unit (GPU), and a memory control processor.

[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, code, 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 disk drives, registers, cache memories, computer-readable storage media, and / or combinations 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 techniques such as wired connections or wireless connections.

[0070] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, procedures, suggestions, methods, and / or flowcharts of operations disclosed in this disclosure to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, procedures, suggestions, methods, and / or flowcharts of operations disclosed in this disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, one or more processors 102 and 202 may execute controls such that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may execute controls such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals 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 descriptions, functions, procedures, suggestions, methods, and / or flowcharts of operations disclosed in this disclosure via one or more antennas 108 and 208. In this 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 into baseband signals to facilitate processing of the received user data, control information, radio signals / channels, etc. by 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 by one or more processors 102 and 202 from baseband signals into 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, under the control of one or more processors 102 and 202, up-convert an OFDM baseband signal into an OFDM signal via their (analog) oscillators and / or filters and transmit the up-converted OFDM signal at a carrier frequency. One or more transceivers 106 and 206 may receive an OFDM signal at the carrier frequency and down-convert the OFDM signal into an OFDM baseband signal via their (analog) oscillators and / or filters under the control of one or more processors 102 and 202.

[0073] Although Figure 2 not shown in the figure, the wireless devices 100 and 200 may further include additional components. The additional components 140 may be configured differently according to the types 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 driving device, and a computing device. The additional components 140 may be coupled to one or more processors 102 and 202 via various techniques such as wired or wireless connections.

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

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

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

[0077] Referring to Figure 3 , UE 100 may correspond to Figure 2 the first wireless device 100 of

[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 operation flowcharts disclosed in the present disclosure. The processor 102 may be adapted to control one or more other components of the UE 100 to implement the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts 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 chip sets, 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), and a modem (modulator and demodulator). Examples of the processor 102 may be found in the SNAPDRAGON TM series processors manufactured by the EXYNOS TM series processors manufactured by a series of processors manufactured by the HELIO TM series processors manufactured by the ATOM TM series processors manufactured by or corresponding next-generation processors.

[0080] Memory 104 is coupled to processor 102 during operation and stores various information for operating processor 102. Memory 104 may include ROM, RAM, flash memory, memory cards, storage media, and / or other storage devices. When the implementation is realized in software, the techniques described herein may be implemented using modules (e.g., procedures, functions, etc.) that execute the descriptions, functions, procedures, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. The modules may be stored in memory 104 and implemented by processor 102. Memory 104 may be implemented within processor 102 or external to processor 102 (in which case, the memory may be communicatively coupled to processor 102 via various means known in the art).

[0081] Transceiver 106 is coupled to processor 102 during operation and transmits and / or receives radio signals. Transceiver 106 includes a transmitter and a receiver. Transceiver 106 may include baseband circuitry to process radio frequency signals. Transceiver 106 controls one or more antennas 108 to transmit and / or receive radio signals.

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

[0083] Display 143 outputs the results processed by processor 102. Keypad 144 receives inputs to be used by processor 102. Keypad 144 may be displayed on display 143.

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

[0085] Speaker 146 outputs the sound-related results processed by processor 102. Microphone 147 receives the sound-related inputs to be used by processor 102.

[0086] Figure 4 and Figure 5 An example of a protocol stack in a 3GPP-based wireless communication system implementing the embodiments of the present disclosure is shown.

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

[0088] In the 3GPP LTE system, Layer 2 is separated into the following sub-layers: MAC, RLC, and PDCP. In the 3GPP NR system, Layer 2 is separated into the following sub-layers: MAC, RLC, PDCP, and SDAP. The PHY layer provides a transport channel to the MAC sub-layer, the MAC sub-layer provides a logical channel to the RLC sub-layer, the RLC sub-layer provides an RLC channel to the PDCP sub-layer, and the PDCP sub-layer provides a radio bearer to the SDAP sub-layer. The SDAP sub-layer provides a quality of service (QoS) flow to the 5G core network.

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

[0090] The MAC provides different types of data transfer services. To accommodate different types of data transfer services, multiple types of logical channels are defined, i.e., each logical channel supports the transfer of a specific type of information. Each logical channel type is defined by what type of information is transferred. Logical channels are divided into two groups: control channels and traffic channels. Control channels are only used for the transfer of control plane information, and traffic channels are only used for the transfer of user plane information. The Broadcast Control Channel (BCCH) is a downlink logical channel used for broadcasting system control information, the Paging Control Channel (PCCH) is a downlink logical channel that transfers paging information, system information change notifications, and indications of ongoing Public Warning Service (PWS) broadcasts, the Common Control Channel (CCCH) is a logical channel used to send control information between the UE and the network and for UEs that do not have an RRC connection to the network, and the Dedicated Control Channel (DCCH) is a point-to-point two-way 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 and is used to transfer user information. DTCH can exist in both the uplink and the 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 transfer modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). The RLC configuration is for each logical channel and is independent of the parameter set and / or transfer duration. In the 3GPP NR system, the main services and functions of the RLC sublayer depend on the transfer mode and include: transfer of upper layer PDUs; sequence numbering independent of one of PDCP (UM and AM); error correction via ARQ (only AM); segmentation (AM and UM) and re-segmentation (only AM) of RLC SDUs; reassembly of SDUs (AM and UM); duplicate detection (only AM); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (only AM).

[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); transfer of user data; reordering and duplicate detection; in-sequence delivery; PDCP PDU routing (in the case of split bearers); retransmission of PDCP SDUs; encryption, decryption, and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; duplication of PDCP PDUs and indication of duplicate discard to the lower layer. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; encryption, decryption, and integrity protection; transfer of control plane data; reordering and duplicate detection; in-sequence delivery; duplication of PDCP PDUs and indication of duplicate discard to the lower layer.

[0093] In the 3GPP NR system, the main services and functions of SDAP include: mapping of QoS flows to data radio bearers; marking of the QoS flow ID (QFI) in both DL packets 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: broadcasting of system information related to AS and NAS; paging initiated by 5GC or NG-RAN; establishment, maintenance, and release of the RRC connection between the UE and NG-RAN; security functions including key management; establishment, configuration, maintenance, and release of signaling radio bearers (SRBs) and data radio bearers (DRBs); mobility functions (including: handover and context transfer; UE cell selection and reselection and control of cell selection and reselection; inter-RAT mobility); QoS management functions; control of UE measurement reporting and reporting; detection and recovery of radio link failures; transfer of NAS messages from the UE to the NAS / from the NAS to the UE.

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

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

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

[0098] Table 3 shows the number of OFDM symbols N u per time slot, the number of time slots N slot symb per frame, and the number of time slots N frame，u slot per sub-frame according to the subcarrier spacing βf = 2 subframe，u slot .

[0099] [Table 3]

[0100] u <![CDATA[N slot symb > <![CDATA[N frame，u slot > <![CDATA[N subframe，u slot > 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0101] Table 4 shows the number of OFDM symbols N u per time slot, the number of time slots N slot symb per frame, and the number of time slots N frame，u slot per sub-frame according to the subcarrier spacing βf = 2subframe，u slot .

[0102] [Table 4]

[0103] u <![CDATA[N slot symb > <![CDATA[N frame,u slot > <![CDATA[N subfrarme，u slot <!-- 11 -->]]> 2 12 40 4

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

[0105] In the 3GPP NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For subcarrier spacing configuration u, the CRBs are numbered upwards from 0 in the frequency domain. The center of subcarrier 0 of CRB0 for subcarrier spacing configuration u coincides with "Point A" which is a common reference point for the resource block grid. In the 3GPP NR system, PRBs are defined within a bandwidth part (BWP) and numbered from 0 to N size BWP,i - 1, where i is the number of bandwidth parts. The physical resource block n in bandwidth part i PRB and the common resource block n CRB have the following relationship: n PRB = n CRB + N size BWP,i , where N size BWP,i is the common resource block from which the bandwidth part starts with respect to CRB0. A BWP includes multiple consecutive RBs. A carrier can include up to N (e.g., 5) BWPs. A UE can be configured with one or more BWPs on a given component carrier. Only one of the multiple BWPs configured for the UE can 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 provided by one or more nodes of a communication system or to radio resources. A "cell" as a geographical area can be understood as the coverage area within which a node can provide services using a carrier, and as radio resources (e.g., time-

[0107] A "cell" associated with a frequency resource is associated with a bandwidth that is a frequency range configured by a carrier. A "cell" associated with radio resources is defined by a combination of downlink resources and uplink resources (e.g., a combination of a DL component carrier (CC) and a UL CC). A cell can be configured by only downlink resources or can be configured by both downlink resources and uplink resources. Since the DL coverage (which is the range within which a node can transmit a valid signal) and the UL coverage (which is the range within which a node can receive a valid signal from a UE) depend on the carrier carrying the signal, the coverage of a node can be associated with the coverage of a "cell" of the radio resources used by the node. Thus, the term "cell" can sometimes be used to represent the serving coverage of a node, at other times represent radio resources, or at other times represent the range within which a signal using the radio resources can reach with an effective strength.

[0108] 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 contiguous CCs and non - contiguous CCs. When CA is configured, the UE has only one RRC connection with the network. At RRC connection establishment / re - establishment / handoff, one serving cell provides NAS mobility information, and at RRC connection re - establishment / handoff, one serving cell provides security input. This cell is called the primary cell (PCell). The PCell is the cell operating on the primary frequency where the UE performs the initial connection establishment process or initiates the connection re - establishment process. Depending on the UE capabilities, secondary cells (SCells) can be configured to form a set of serving cells together with the PCell. An SCell is a cell that provides additional radio resources on top of the special cell (SpCell). Thus, the set of configured serving cells for the UE always consists of one PCell and one or more SCells. For dual - connectivity (DC) operation, the term SpCell refers to the PCell of the master cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG). The SpCell supports PUCCH transmission and contention - based random access and is always active. The MCG is the group of serving cells associated with the master node, which includes the SpCell (PCell) and optionally one or more SCells. For a UE configured with DC, the SCG is a subset of the serving cells associated with the secondary node, which includes the PSCell and zero or more SCells. For an RRC_CONNECTED UE not configured with CA / DC, there is only one serving cell consisting of the PCell. For an RRC_CONNECTED UE configured with CA / DC, the term "serving cell" is used to represent the set of cells consisting of the SpCell and all SCells. In DC, two MAC entities are configured in the UE: one for the MCG and one for the SCG.

[0109] Figure 7 Fig. shows an example of data flow in a 3GPP NR system implementing the present disclosure.

[0110] Refer to Figure 7 , "RB" represents radio bearer, and "H" represents header. Radio bearers are classified into two groups: DRB for user - plane data and SRB for control - plane data. MAC PDUs are sent / received to / from external devices through the PHY layer using radio resources. The MAC PDU arrives at the PHY layer in the form of transport blocks.

[0111] In the PHY layer, the uplink transmission channels UL-SCH and RACH are respectively mapped to their physical channels, the Physical Uplink Shared Channel (PUSCH) and the Physical Random Access Channel (PRACH), and the downlink transmission channels DL-SCH, BCH, and PCH are respectively mapped to the Physical Downlink Shared Channel (PDSCH), the Physical Broadcast Channel (PBCH), and the PDSCH. In the PHY layer, the Uplink Control Information (UCI) is mapped to the Physical Uplink Control Channel (PUCCH), and the Downlink Control Information (DCI) is mapped to the Physical Downlink Control Channel (PDCCH). The UE sends the MAC PDU related to UL-SCH via the PUSCH based on the UL grant, and the BS sends the MAC PDU related to DL-SCH via the PDSCH based on the DL assignment.

[0112] In wireless communication, the UE can move from the source cell to the target cell in the connected state (i.e., RRC_CONNECTED) or the non-connected state (i.e., RRC_IDLE / RRC_INACTIVE). The mobility in the connected state can include network-controlled mobility and / or UE-based mobility (i.e., conditional mobility). The network-controlled mobility can include handover (i.e., PCell change), secondary node (SN) addition (i.e., PSCell addition), and / or SN change (i.e., PSCell change). The conditional mobility can include conditional handover (CHO) (i.e., conditional PCell change), conditional SN addition (i.e., conditional PSCell addition, CPA), and / or conditional SN change (i.e., conditional PSCell, CPC). The mobility in the non-connected state can include cell selection and / or cell reselection.

[0113] In the following, cell selection / reselection is described.

[0114] I. Cell Selection Criteria

[0115] When Srxlev > 0 and Squal > 0, the cell selection criterion S is satisfied. Here, 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:

[0116] [Table 5]

[0117]

[0118]

[0119] The signaled value Q is applied only when the cell is evaluated for cell selection as a result of a periodic search for higher priority PLMNs while normally camped on the VPLMN. rxlevminoffset and Q qualminoffset . During the periodic search for higher priority PLMNs, the UE may use parameter values stored from different cells of that higher priority PLMN to check the S-criterion of the cell.

[0120] II. Reselection prioritization handling

[0121] The absolute priorities of different NR frequencies or inter-RAT frequencies can be provided to the UE in system information, in the RRC Release message, or inherited from another RAT through inter-RAT cell selection (reselection). In the case of system information, an NR frequency or an inter-RAT frequency can be listed without providing a priority (i.e., there is no field cellReselectionPriority 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 system information. If slice reselection information is provided in dedicated signaling, the UE shall ignore the slice reselection information provided in system information.

[0122] In some implementations, the information provided in the RRC Release may override the information provided in the SIB. This can include slice-specific reselection information, existing / legacy cellResleectionPriority.

[0123] In some implementations, a "PCI list" can be provided in the RRC Release.

[0124] If the UE is in the normal camped state and the UE supports slice-based cell reselection, the UE shall derive the reselection priority.

[0125] If the UE is in the camped on any cell state, unless otherwise specified, the UE shall apply only the priorities provided by the system information from the current cell, and the UE retains the priorities provided by the deprioritisationReq and dedicated signalling received in the RRCRelease. When a UE in the normal camping state has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency as the lowest priority frequency (i.e., lower than any network configured value). When a UE with HSDN capability is in a high mobility state, the UE shall always consider the HSDN cell as the highest priority (i.e., higher than the priorities 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 as the lowest priority (i.e., lower than the priorities configured by any other network). If the UE is configured to perform both NR sidelink communication and V2X sidelink communication, the UE may consider the frequency that provides both the NR sidelink communication configuration and the V2X sidelink communication configuration as the highest priority. If the UE is configured to perform NR sidelink communication and does not perform V2X communication, the UE may consider the frequency that provides the NR sidelink communication configuration as the highest priority. If the UE is configured to perform V2X sidelink communication and does not perform NR sidelink communication, the UE may consider the frequency that provides the V2X sidelink communication configuration as the highest priority.

[0126] Frequencies that provide only an anchor frequency configuration shall not be prioritised for V2X services during cell reselection.

[0127] When the UE is configured to perform cell reselection for NR sidelink communication or V2X sidelink communication, frequencies that provide intra-carrier and inter-carrier configurations may be considered to have equal priority in cell reselection.

[0128] The prioritisation among the frequencies that the UE considers as the highest priority frequencies is determined by the UE implementation.

[0129] If the UE has the capability and is authorised for the corresponding sidelink operation, the UE is configured to perform V2X sidelink communication or NR sidelink communication.

[0130] When the UE is configured to perform both NR sidelink communication and V2X sidelink communication, but cannot find a frequency that can provide both the NR sidelink communication configuration and the V2X sidelink communication configuration, the UE may consider the frequency that provides the NR sidelink communication configuration or the V2X sidelink communication configuration as the highest priority.

[0131] The UE is configured with slice or slice group specific frequency priorities or dedicated cell reselection priorities in the RRCRelease message.

[0132] 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 a provided priority.

[0133] If a UE with MBS broadcast capabilities is receiving or interested in receiving MBS broadcast services and can receive the MBS broadcast services only by camping on the frequencies it is provided with, the UE may consider such frequencies as having the highest priority during an MBS broadcast session as long as the following two conditions are met:

[0134] 1) The cell reselected by the UE due to frequency prioritization for MBS is providing SIB20;

[0135] 2) Any one of the following:

[0136] - One or more MBS FSAIs of the frequency are indicated in SIB21 of the serving cell and the same MBS FSAIs are also indicated for the MBS broadcast service in the MBS user service description (USD), or

[0137] - SIB21 is not set in the serving cell and the frequency is included in the USD of the service, or

[0138] - 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.

[0139] How to use the information in the USD to determine whether / how to perform frequency prioritization for a specific frequency included in the USD depends on the UE implementation.

[0140] If a UE with MBS broadcast capabilities is receiving or interested in receiving MBS broadcast services, the UE may consider the cell reselection candidate frequencies on which it cannot receive MBS broadcast services as having the lowest priority during an MBS broadcast session, as specified in TS38.300 [2], as long as the cell on the MBS frequency monitored by the UE provides SIB20 and as long as condition 2) above is met for the serving cell.

[0141] In the case where the UE receives an RRCRelease with deprioritisationReq, regardless of the serving RAT, while T325 is running, the UE shall consider the frequencies stored due to the previously received RRCRelease with deprioritisationReq and all frequencies of the current frequency or NR as having the lowest priority frequencies (i.e., lower than any network-configured value). When performing PLMN selection or SNPN selection upon request from the NAS, the UE shall delete the stored deprioritisation request.

[0142] 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.

[0143] The UE shall remove the priority provided by dedicated signaling in the following cases:

[0144] - The UE enters a different RRC state; or

[0145] - The optional validity time (T320) of the dedicated priority expires; or

[0146] - The UE receives an RRC Release message missing the field cellReselectionPriorities; or

[0147] - Perform PLMN selection or SNPN selection according to the NAS request.

[0148] The UE shall not consider any list-excluded cells as candidates for cell reselection.

[0149] The UE shall consider only the list-permitted cells (if configured) as candidates for cell reselection.

[0150] A UE in the RRC_IDLE state shall inherit the priority and remaining validity time (i.e., T320 in NR and E-UTRA) set by dedicated signaling during inter-RAT cell selection (reselection) (if configured).

[0151] The network may assign a dedicated cell reselection priority for frequencies not configured by system information.

[0152] III. Inter-frequency and Inter-RAT Cell Reselection Criteria

[0153] If threshServingLowQ is broadcast in the system information and more than 1 second has elapsed since the UE camped on the current serving cell, then if a cell of a higher priority NR or EUTRAN RAT / frequency satisfies Squal > Thresh RAT during the time interval Treselection X,HighQ a cell reselection to a cell on a higher priority NR frequency or an inter-RAT frequency compared to the serving frequency shall be performed.

[0154] Otherwise, if i) during the time interval Treselection RAT a cell of a higher priority RAT / frequency satisfies Srxlev > Thresh X,HighP; and ii) if more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on an NR frequency with a higher priority than the serving frequency or an inter-RAT frequency shall be performed.

[0155] Cell reselection to a cell on an NR frequency with equal priority shall be based on the ranking for intra-frequency cell reselection.

[0156] If threshServingLowQ is broadcast in the system information and more than 1 second has elapsed since the UE camped on the current serving cell, then if the serving cell satisfies Squal < Thresh Serving,LowQ , and during the time interval Treselection RAT , a cell on a lower-priority NR or E-UTRAN RAT / frequency satisfies Squal > Thresh X,LowQ , then cell reselection to a cell on an NR frequency or an inter-RAT frequency with a lower priority than the serving frequency shall be performed.

[0157] Otherwise, if i) the serving cell satisfies Srxlev < Thresh Serving,LowP , and during the time interval Treselection RAT , a cell on a lower-priority RAT / frequency satisfies Srxlev > Thresh X,LowP ; and ii) more than 1 second has elapsed since the UE camped on the current serving cell, then cell reselection to a cell on an NR frequency or an inter-RAT frequency with a lower priority than the serving frequency shall be performed.

[0158] For a UE that performs slice-based cell reselection, if a cell satisfies the above criteria for cell reselection for the reselection priority based on frequency and slice group, but the cell does not support the slice group, the UE shall re-deduce the reselection priority for the frequency by considering the slice group supported by the cell (instead of the slice group corresponding to the NR frequency). The reselection priority shall be used until the cell with the highest ranking changes in frequency or new slice or slice group priorities are received from the NAS. The UE shall ensure that the above cell reselection criteria are met based on the newly deduced priority.

[0159] If multiple cells with different priorities satisfy the cell reselection criteria, cell reselection to a cell on a higher-priority RAT / frequency shall take precedence over a cell on a lower-priority RAT / frequency.

[0160] If more than one cell satisfies the above criteria, then if the highest priority frequency is an NR frequency, the cell with the highest ranking among the cells on the highest priority frequency satisfies 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 satisfies the criteria of that RAT, then the UE shall reselect the cell.

[0161] IV. Intra-frequency and Equal Priority Inter-frequency Cell Reselection Criteria

[0162] Cell ranking criterion R for the serving cell s and R for neighboring cells n are defined by the following: 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:

[0163] [Table 6]

[0164]

[0165] The UE shall perform ranking on all cells that satisfy the cell selection criterion S. According to the R criterion specified above, by deriving Q meas,n and Q meas,s and using the averaged RSRP results to calculate the R value to rank the cells.

[0166] If rangeToBestCell is not configured, the UE shall perform cell reselection to the cell with the highest ranking. If it is found that the cell is not suitable, the UE shall not consider this cell and other cells on the frequency that has the same operation in the authorized spectrum as the candidate for reselection within at most 300 seconds.

[0167] 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 R value of the cell with the highest ranking. In the present disclosure, "beams above the threshold" can be referred to as good beams. If there are multiple such cells, the UE shall perform cell reselection to the cell with the highest ranking among them. If it is found that the cell is not suitable, the UE shall not consider this cell and other cells on the frequency that has the same operation in the authorized spectrum as the candidate for reselection within at most 300 seconds.

[0168] In all cases, the UE shall reselect a new cell only if i) the new cell is better than the serving cell according to the cell reselection criteria specified above during the time interval Treselection RAT ; and / or ii) more than 1 second has elapsed since the UE camped on the current serving cell.

[0169] If rangeToBestCell is configured on the 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.

[0170] Figure 8 An example of a conditional handover process to which the technical features of the present disclosure can be applied is shown. In the present disclosure, the conditional handover process as Figure 8 shown can also be applied to other conditional mobility processes (i.e., the CPA process and / or the CPC process).

[0171] Referring to Figure 8 , in step S801, the source cell may send a measurement control message to the UE. The measurement control message may include a measurement configuration, which includes a list of measurement configurations, and each measurement configuration in the list includes a measurement identifier (ID), a corresponding measurement object, and a corresponding reporting configuration.

[0172] In step S803, the UE may send a measurement report message to the source cell. The measurement report message may include the measurement results of neighbor cells around the UE that it can detect. The UE may generate the measurement report message according to the measurement control information and / or the measurement configuration in the measurement control message received in step S801.

[0173] In step S805, the source cell may make a handover decision based on the measurement report. For example, the source cell may make a handover decision and determine candidate target cells (e.g., target cell 1 and target cell 2) for handover between neighbor cells around the UE based on the measurement results of the neighbor cells (e.g., signal quality, reference signal received power (RSRP), reference signal received quality (RSRQ)).

[0174] In step S807, the source cell may send a handover request message to target cell 1 and target cell 2 determined in step S805. That is, the source cell may perform handover preparation with target cell 1 and target cell 2. The handover request message may include the necessary information for preparing the handover on the target side (e.g., target cell 1 and target cell 2).

[0175] In step S809, each of target cell 1 and target cell 2 may perform admission control based on the information included in the handover request message. The target cell may configure and reserve the required resources (e.g., C-RNTI and / or RACH preamble). The AS configuration to be used in the target cell may be specified independently (i.e., "established"), or as an increment compared to the AS configuration used in the source cell (i.e., "reconfigured").

[0176] In step S811, target cell 1 and target cell 2 may send a handover request acknowledgement (ACK) message to the source cell. The handover request ACK message may include a cell configuration (i.e., an RRCReconfiguration message including ReconfigurationWithSync), which includes information about the resources reserved and prepared for the handover. For example, the handover request ACK message may include a transparent container to be sent to the UE as an RRC message (i.e., an RRCReconfiguration message / cell configuration) to perform the handover. The container / cell configuration / RRCReconfiguration message may include the information required to access the target cell (i.e., access configuration), which includes at least one of the following: the physical cell ID of the target cell, the identifier of the UE (i.e., C-RNTI), the HO validity timer (i.e., T304 timer), the target gNB security algorithm identifier for the selected security algorithm, the set of dedicated RACH resources for contention-free random access (e.g., dedicated random access preambles), the association between the RACH resources and the SSB, the association between the RACH resources and the UE-specific CSI-RS configuration, the common RACH resources, or the system information of the target cell. If RACH-less handover is configured, the container may include a timing adjustment indication and an optional pre-allocated uplink grant. If necessary, the handover request ACK message may also include RNL / TNL information for the forwarding tunnel. As long as the source cell receives the handover request ACK message, or as long as the transmission of a conditional handover command is initiated in the downlink, data forwarding may be initiated.

[0177] In step S813, the source cell may send an RRCReconfiguration message including conditional reconfiguration to the UE. The conditional reconfiguration may also be referred to as (or may include) conditional handover (CHO) configuration and / or conditional handover command (e.g., CHO command). The conditional reconfiguration may include a list of conditional reconfiguration / conditional handover commands, which includes conditional reconfiguration / conditional handover commands for each of the candidate target cells (e.g., target cell 1, target cell 2). For example, the conditional reconfiguration may include a conditional reconfiguration / conditional handover command for target cell 1 and a conditional reconfiguration / conditional handover command for target cell 2. The conditional reconfiguration for a target cell may include an index / identifier identifying the corresponding conditional reconfiguration, a handover condition for the target cell (or an execution condition for conditional mobility / handover), and / or a cell configuration for the target cell (i.e., an RRCReconfiguration message including reconfigurationWithSync). The RRCReconfiguration message and / or reconfigurationWithSync for a target cell may include information required to access the target cell, which includes at least one of the physical cell ID of the target cell, the identifier of the UE (i.e., C-RNTI), the HO validity timer (i.e., T304 timer), the target gNB security algorithm identifier for the selected security algorithm, a set of dedicated RACH resources for contention-free random access (e.g., dedicated random access preambles), the association between the RACH resources and the SSB, the association between the RACH resources and the UE-specific CSI-RS configuration, the association between common RACH resources, or the system information of the target cell.

[0178] In step S815, the UE may perform an evaluation of the handover conditions for the candidate target cells (e.g., target cell 1, target cell 2) and select a target cell for handover among the candidate target cells. For example, the UE may perform measurements on the candidate target cells and determine based on the measurement results of the candidate target cells whether the candidate target cells among the candidate target cells meet the handover conditions for the candidate target cells. Alternatively, the UE may determine whether the target cell / the measurement results for the target cell meet the handover conditions for the target cell. If the UE identifies that target cell 1 meets the handover conditions for target cell 1, the UE may select target cell 1 as the target cell for handover.

[0179] In step S817, the UE can detach from the old cell (i.e., the source cell) and synchronize to the new cell (i.e., the selected target cell). The UE can perform a handover from the source cell to the target cell based on the applied cell configuration. For example, upon receiving a handover command, the UE can start the T304 timer and perform contention-free random access towards the target cell based on a set of dedicated RACH resources.

[0180] In step S819, upon successful completion of the random access procedure, the UE can stop the T304 timer and send a handover complete message (i.e., the RRCReconfigurationComplete message) to the target cell. The UE can send the RRCReconfigurationComplete message including the C-RNTI to the target cell to confirm the handover, indicating that the handover procedure has been completed for the UE. The target RAN node can verify the C-RNTI sent in the RRCReconfigurationComplete message. The target RAN node can now start sending data to the UE. When the random access fails and the T304 timer is still running, the UE can retry the random access towards the target cell. Upon expiration of the T304 timer, the UE can declare a handover failure (HOF) and perform an RRC reconstruction procedure.

[0181] In the following, the content regarding network energy saving (NES) is described.

[0182] The purpose of the NES function is to reduce operator costs through energy saving.

[0183] The NES function allows for optimized energy consumption, for example, in deployments where capacity boosters can be distinguished from cells providing basic coverage, such that the possibility of providing additional capacity via single or dual connections for E-UTRA or NR cells can be switched off when their capacity is no longer needed and reactivated on an as-needed basis, as well as various other techniques in the time, frequency, space, and power domains.

[0184] The in-system energy saving solution is based on the possibility that the NG-RAN node owning the capacity booster cell autonomously decides to switch off such a cell to reduce energy consumption (inactive state). This decision is typically based on cell load information (consistent with the configured information). The switch-off decision can also be made through operation and maintenance (O&M).

[0185] The NG-RAN node can initiate a handover action to offload the switched-off cell and can indicate the reason for the handover with an appropriate cause value to support the target node in taking subsequent actions, for example, when selecting a target cell for a subsequent handover.

[0186] With the help of the NG-RAN node configuration update process, the NG-RAN node owning the relevant cell notifies all neighbor NG-RAN nodes about the shutdown action via the Xn interface.

[0187] All notified nodes also maintain the cell configuration data (e.g., neighbor relationship configuration) when the specific cell is inactive. If the NG-RAN node cell ensures basic coverage, then if the capacity demand in such a cell requires it, the NG-RAN node owning a non-capacity-enhanced cell can request reactivation via the Xn interface. This is achieved through the cell activation process. During the shutdown period of the enhanced cell, the NG-RAN node can prevent idle-mode UEs from camping on the cell and can prevent handovers into the same cell.

[0188] The receiving NG-RAN node shall act accordingly. The activation decision can also be made via O&M. All peer NG-RAN nodes are notified of the reactivation by the NG-RAN node owning the relevant cell via an indication on the Xn interface.

[0189] The inter-system energy-saving solution is based on the autonomous decision of the NG-RAN node owning a cell with a capacity booster to shut down such a cell to the dormant state. This decision is usually based on cell load information (consistent with the configured information). The shutdown decision can also be made via O&M. The NG-RAN node indicates the shutdown action to the eNB via the NG interface and the S1 interface. The NG-RAN node can also indicate the activation action to the eNB via the NG interface and the S1 interface.

[0190] The eNB providing basic coverage can request the reactivation of the NG-RAN node's cell based on its own cell load information or neighbor cell load information. The activation decision can also be made via O&M. The eNB requests the reactivation of the NG-RAN node's cell and receives the NG-RAN node's cell reactivation response from the NG-RAN node via the S1 interface and the NG interface. When receiving the reactivation request, the NG-RAN node's cell shall remain active for at least until the minimum activation time expires. The minimum activation time can be configured via O&M or depends on the implementation of the NG-RAN node.

[0191] To promote reducing the gNB downlink transmission / uplink reception active time, the UE may be configured with a periodic cell discontinuous transmission (DTX) / discontinuous reception (DRX) mode (i.e., active and inactive periods). The mode configuration for cell DTX / DRX is common for UEs configured with this feature in the cell. The cell DTX and cell DRX modes can be configured and activated separately. When cell DTX is configured and activated for the relevant cell, the UE does not monitor the PDCCH in the selected cases or SPS occasions during the cell DTX inactive duration. When cell DRX is configured and activated for the relevant cell, the UE does not transmit on the CG resources or transmit the SR during the cell DRX inactive duration. This feature only applies to UEs in the RRC_CONNECTED state, and it does not affect the random access procedure, SSB transmission, paging, and system information broadcast. The cell DTX / DRX can be activated / deactivated by RRC signaling or L1 group common signaling. The features of the cell DTX / DRX are as follows:

[0192] - Active duration: The duration during which the UE waits to receive the PDCCH or SPS occasion and transmit the SR or CG. During this duration, for the purpose of network energy saving, the gNB transmission / reception of the PDCCH, SPS, SR, and CG is not affected;

[0193] - Cycle: The periodic repetition of the period following the active duration with an inactive duration;

[0194] When both are configured, the active duration and cycle parameters are common between cell DTX and cell DRX.

[0195] As long as the gNB identifies an emergency call or a public safety-related service (e.g., MPS or MCS), the network should ensure that there is no impact on this service (e.g., it can release or deactivate the cell DTX / DRX configuration). The network should also ensure that there is at least partial overlap between the UE's connected-mode DRX on duration and the cell DTX / DRX active duration, i.e., the UE's connected-mode DRX periodicity is a multiple of the cell DTX / DRX periodicity, and vice versa.

[0196] The access of UEs supporting NES to the cell is controlled by a single bit in SIB1 (if present), otherwise a prohibition mechanism is applied.

[0197] In this disclosure, there can be various cell states including a non-NES state (or NES_off state), a cell DTX / DRX state (a sub-state of the NES state), and / or a cell shutdown (or off) state (a sub-state of the NES state).

[0198] The non-NES state is a state in which i) the UE is not configured with a cell DTX / DRX configuration, or ii) the UE is configured with a cell DTX / DRX configuration, but the cell DTX / DRX is not activated. In the non-NES state, all durations are active durations.

[0199] The cell DTX / DRX state is a state in which the UE is configured with a cell DTX / DRX configuration and the cell DTX / DRX is activated. In the cell DTX / DRX state, a cycle of active duration and inactive duration is repeated periodically.

[0200] The cell shutdown state is a state in which all durations are inactive durations. When the cell is in the cell shutdown state, a UE in the idle mode is not allowed to camp on the cell, and the UE is not allowed to perform mobility to the cell.

[0201] During the active duration:

[0202] - The UE can monitor PDCCH and / or semi-persistent scheduling (SPS) occasions (i.e., the cell DTX active duration); and / or

[0203] - The UE can transmit on a configured grant (CG) resource and / or transmit a scheduling request (SR) (i.e., the cell DRX active duration).

[0204] During the inactive duration:

[0205] - The UE does not monitor PDCCH and / or SPS occasions (i.e., the cell DTX inactive duration); and / or

[0206] - The UE does not transmit on a CG resource and / or does not transmit an SR (i.e., the cell DRX inactive duration).

[0207] In addition, the cell can enter its operating state to save its power consumption. For example, the cell can enter the NES state. There can be various cell states including the non-NES state and the NES state as a sub-state in the NES state. When the cell changes its sub-state, its acceptance level for UE camping can be different. Therefore, it is desirable to adjust the reselection parameters / execution conditions for conditional mobility according to the (sub-)state of the cell. In addition, the network may want to randomize the cell reselection adjustment / execution conditions based on the (sub-)state of the cell.

[0208] In addition, as long as the UE receives cell state information, the UE should be able to determine when / under which conditions the cell state information becomes invalid.

[0209] Figure 9Shows an example of a method performed by a UE according to an embodiment of the present disclosure. The method may also be performed by a wireless device.

[0210] Referring to Figure 9 , in step S901, the UE may receive information on multiple mobility conditions for a target cell. Each of the multiple mobility conditions may be related to a corresponding cell state among multiple cell states.

[0211] In step S903, the UE may receive information on at least one cell state among the multiple cell states.

[0212] In step S905, the UE may evaluate at least one mobility condition among the multiple mobility conditions that is related to at least one cell state.

[0213] In step S907, based on satisfying the mobility condition among at least one mobility condition, the UE may perform mobility to the target cell.

[0214] According to various embodiments, information on multiple mobility conditions may be received via radio resource control (RRC) signaling. Information on at least one cell state may be received via medium access control (MAC) control element (CE) signaling or downlink control information (DCI).

[0215] According to various embodiments, mobility may include cell reselection. The multiple mobility conditions may include cell reselection conditions: the cell ranking value for the target cell is the highest among the cell ranking values for the serving cell and the one or more cell ranking values for one or more neighboring cells; or based on the cell ranking value for the target cell belonging to one or more cell ranking values of cells within a threshold range from the highest cell ranking value, the number of good beams of the target cell is the highest among the cells.

[0216] According to various embodiments, mobility may include conditional mobility. The multiple mobility conditions may include execution conditions for conditional mobility. The execution conditions may be related to at least one of a measurement value for the target cell, a measurement value for the serving cell, one or more thresholds, or a trigger time (TTT).

[0217] According to various embodiments, the execution conditions may include at least one of the following: an event A2 condition where a measurement value for a serving cell is lower than a source cell threshold; an event A3 condition where a measurement value for a target cell is higher than the measurement value for the serving cell plus an offset threshold by at least a TTT; an event A4 condition where a measurement value for a target cell is higher than a target cell threshold; or an event A5 condition where a measurement value for a target cell is higher than a target cell threshold and a measurement value for the serving cell is lower than a source cell threshold for at least a TTT.

[0218] According to various embodiments, the information for multiple mobility conditions may include: multiple mobility conditions; and multiple cell state identifiers (IDs), each of the multiple cell state IDs being associated with a corresponding mobility condition. The UE may identify at least one mobility condition associated with at least one cell state based on at least one matching cell state ID.

[0219] According to various embodiments, the information for multiple mobility conditions may include: multiple offsets; and multiple cell state identifiers IDs, each of the multiple cell state IDs being associated with a corresponding offset. The UE may identify at least one offset associated with at least one cell state based on at least one matching cell state ID. The UE may determine at least one mobility condition based on applying at least one offset to one or more parameters of a reference mobility condition.

[0220] According to various embodiments, at least one mobility condition may be relaxed relative to a reference mobility condition based on at least one offset applied to one or more parameters. The one or more parameters may include at least one of the following: a cell ranking value for a target cell, a cell ranking value for a serving cell, a cell ranking value for at least one neighbor cell other than the target cell, a measurement value for a target cell, a measurement value for a serving cell, an offset threshold, a source cell threshold, a target cell threshold, or a trigger time (TTT).

[0221] According to various embodiments, multiple cell states may include a non-network energy saving (NES) state, a first NES state, and a second NES state. The first NES state and the second NES state may be sub-states of the NES state.

[0222] According to various embodiments, the non-NES state may be a state where all durations are active durations. The first NES state may be a state where an active duration and an inactive duration cycle are periodically repeated. The second NES state may be a state where all durations are inactive durations.

[0223] According to various embodiments, during the active duration: the UE monitors at least one of a Physical Downlink Control Channel (PDCCH) or a Semi-Persistent Scheduling (SPS) occasion; or the UE performs transmission on a Configured Grant (CG) resource, or transmits a Scheduling Request (SR). During the inactive duration: the UE does not monitor at least one of the PDCCH or the SPS occasion; or the UE does not perform transmission on the CG resource, or does not transmit the SR.

[0224] According to various embodiments, at least one cell state may include at least one of a first NES state or a second NES state. Mobility conditions associated with the first NES state may be looser than reference mobility conditions associated with a non-NES state. Mobility conditions associated with the second NES state may be looser than mobility conditions associated with the first NES state.

[0225] According to various embodiments, the non-NES state may be a non-cell Discontinuous Transmission (DTX) / Discontinuous Reception (DRX) state. The first NES state may be a cell DTX / DRX state. The second NES state may be a cell shutdown state.

[0226] According to various embodiments, the UE may receive a configuration including an association between a cell state and a mobility adjustment value. The UE may receive the state of one or more cells. The validity of the received cell state may be related to a timer. The UE may measure the quality of the serving cell and one or more neighbor cells. The UE may determine mobility adjustment values for the serving cell and the neighbor cells. The mobility adjustment may be applied only when the cell state is considered valid. The UE may perform an evaluation of the measured cells by applying the determined mobility adjustment values. The UE may access one of the measured cells selected by the evaluation.

[0227] According to various embodiments, the UE may receive a configuration including an association between a cell state and a mobility adjustment value. The UE may receive the state of one or more cells. The validity of the received cell state may be related to a timer. The UE may measure the quality of the serving cell and one or more neighbor cells. The UE may determine the mobility adjustment values for the serving cell and the neighbor cells. The mobility adjustment may be applied only when the cell state is considered valid. The UE may evaluate the ranking of the measured cells by applying the determined reselection adjustment values. The UE may perform cell reselection to the best ranked cell.

[0228] According to various embodiments, a UE may receive a configuration including one or more target cell configurations and mobility conditions associated with at least one of target cells. An execution condition may be associated with a cell state of one of a serving cell or a target cell. The UE may receive a lower layer indication including at least one cell state. The UE may determine at least one applicable mobility execution condition based on the lower layer indication and the validity of the cell state. The UE may evaluate the applicable mobility conditions. Based on satisfying the determined mobility conditions, the UE may access a target cell associated with the mobility conditions.

[0229] Figure 10 An example of a method performed by a network node according to an embodiment of the present disclosure is shown. The network node may be a source node associated with a serving cell for mobility and include a base station (BS).

[0230] Referring to Figure 10 , in step S1001, the network node may send information on a plurality of mobility conditions for a target cell to the UE. Each of the plurality of mobility conditions may be related to a corresponding cell state among a plurality of cell states. The information on the plurality of mobility conditions may be sent via RRC signaling.

[0231] In step S1003, the network node may send information on at least one cell state among the plurality of cell states to the UE. The information on at least one cell state may be sent via MAC CE signaling and / or DCI.

[0232] In step S1005, the UE may evaluate at least one mobility condition among the plurality of mobility conditions related to at least one cell state.

[0233] In step S1007, based on satisfying the mobility condition among at least one mobility condition, the UE may perform mobility to the target cell.

[0234] Figure 11 An example of adjusting reselection parameters according to a cell state according to an embodiment of the present disclosure is shown.

[0235] Referring to Figure 11 , in step S1101, the UE may receive information on a plurality of cell reselection conditions for a target cell. The information on the plurality of cell reselection conditions may be received via RRC signaling and / or system information block (SIB) broadcast. The information on the plurality of cell reselection conditions may include a plurality of cell reselection conditions and a plurality of cell state IDs, each of the plurality of cell state IDs being related to a corresponding cell reselection condition. If the cell state information including the information on the plurality of cell reselection conditions is configured for the UE via RRC signaling and / or SIB broadcast, this step may be omitted.

[0236] In step S1103, the UE may receive cell state information for the serving cell and / or one or more neighbor cells.

[0237] For example, the cell state information may be provided to the UE via RRC signaling and / or SIB broadcast. For each frequency, the cell state information may be defined for a list of cells and include the following information elements (IEs) as shown in Table 7:

[0238] [Table 7]

[0239]

[0240]

[0241] In Table 7, Qoffset j is a cell- and / or state-specific offset. Instead of Qoffset j , a state-specific Qoffset j may be configured for a group of neighbor cells. The cell state ID may indicate the cell state between the non-NES state and the NES state.

[0242] For example, the cell state information may be provided to the UE via MAC CE and / or DCI. The MAC CE and / or DCI may include at least one of the following:

[0243] - Field 1: Short frequency ID (may be omitted for in-frequency cells);

[0244] - Field 2: Short cell ID; or

[0245] - Field 3: Cell state ID.

[0246] Since the MAC CE / DCI can carry limited information, the UE may be (pre)-configured via dedicated RRC signaling and / or SIB broadcast with the following associated information:

[0247] - Association between the short frequency ID and the actual frequency identifier (ARFCN);

[0248] - Association between the short cell ID and the actual cell ID (e.g., PCI);

[0249] - Association between the cell state ID and Qffset;

[0250] - Association between {cell ID, cell state ID} and Qoffset; or

[0251] - IE, as shown in Table 7 above.

[0252] That is to say, when receiving the MAC CE / DCI carrying cell status information in step S1103, the associated information can be received via RRC signaling and / or SIB broadcast before step S1103. For example, the associated information can be included in the information for multiple cell reselection conditions received in step S1101.

[0253] As long as the UE receives the cell status information, the UE can determine whether the cell status information is valid. For example, the cell status information is valid within a specific duration, where the duration can be configurable until it is overwritten by new information for the same cell. As another example, the cell status information is valid until it is overwritten by new information for the same cell.

[0254] In step S1105, the UE can determine at least one cell reselection condition for the target cell based on the cell status information.

[0255] The UE can identify at least one cell status / cell status ID notified by the cell status information and determine at least one cell reselection condition associated with the at least one cell status / cell status ID. For example, the UE can determine at least one cell status specific offset (e.g., Qoffset) associated with the at least one cell status / cell status ID based on the associated information in the information for multiple cell reselection conditions. The at least one cell status specific offset can include a cell status specific offset for the serving cell and / or one or more cell status specific offsets for one or more neighbor cells. Then, the UE can determine at least one cell reselection condition for the target cell based on applying the at least one cell status specific offset to one or more parameters of the reference cell reselection condition.

[0256] For example, the cell reselection condition for the target cell can be the following conditions:

[0257] i) The R n value (e.g., the cell ranking value for the target cell) is the highest among the R s value (e.g., the cell ranking value for the serving cell) and / or one or more R n' values (e.g., the cell ranking values for neighbor cells); or

[0258] ii) When the R n value for the target cell belongs to one or more R values of cells within a threshold range from the highest R value, the target cell has the highest number of good beams among the cells.

[0259] For example, R s and R nCan be expressed as:

[0260] R s = Q meas，s + Q hyst - Qoffset temp + Q s，j ; and

[0261] R n = Q meas，n - Qoffset temp + Q n，j , where

[0262] Qs,j: Qoffset for the serving cell in NES state j; and

[0263] Qn,j: Qoffset for neighbor cell n in NES state j.

[0264] If the cell state is unknown or considered invalid, Qx,j can be zero.

[0265] For example, R s and R n can be expressed as:

[0266] R s = Q meas，s + Q hyst - Qoffset temp + Qs,j * I s，j ; and

[0267] R n = Q meas，n - Qoffset - Qoffset temp + Qn,j * I n，j , where

[0268] Qs,j: Qoffset for the serving cell in NES state j

[0269] Qn,j: Qoffset of neighbor cell n in NES state j

[0270] I s,j : Indicator function (0 or 1) for applying Qs,j; and

[0271] I n,j : Indicator function (0 or 1) for applying Qn,j.

[0272] To determine the indicator function value, the UE needs to be pre-configured with P s,j and P n,jWhen the UE performs cell reselection evaluation, the UE draws a random value uniformly distributed between 0 and 1. If the random value is less than P s,j , then I s,j = 1, otherwise 0. If the random value is less than P n,j , then I n,j = 1, otherwise 0. Instead of cell- and state-specific P n,j , state-specific P n,j can be configured for a group of neighbor cells.

[0273] For example, R s and R n can be expressed as:

[0274] R s = Q meas，s + Qhyst - Qoffset temp + Qs,j * P s，j ; and

[0275] R n = Q meas，n - Qoffset - Qoffset temp + Qn,j * P n，j , where

[0276] Q s,j : Qoffset for the serving cell in NES state j; and

[0277] Q n,j : Qoffset for neighbor cell n in NES state j.

[0278] To determine the indicator function value, when the UE performs cell reselection evaluation, the UE draws a random value uniformly distributed between 0 and 1 and applies the random value as P s,j and P n,j . Instead of cell- and state-specific P n,j , state-specific P n,j can be configured for a group of neighbor cells.

[0279] In the above example, the cell state-specific offset Qs,j is interpreted as being applied to R s , Q meas,s , Q hyst and / or Qoffset temp . The state-specific offset Qn,j is interpreted as being applied to R n , Q meas,n , Qoffset and / or Qoffset temp .

[0280] When at least one cell state specific offset is associated with a non - NES state (i.e., NES_off state), the at least one cell state specific offset can be set to zero.

[0281] For example, NES states = {NES_1, NES_2}, and the UE can be configured with the following Qoffsets in the associated information included in the information for multiple cell reselection conditions:

[0282] - When the serving cell is under NES_1, Qs,1 is +4 dB;

[0283] - When the serving cell is under NES_2, Qs,2 is -4 dB;

[0284] - When neighbor cell n1 is under NES_1, Qn1,1 is -5 dB;

[0285] - When neighbor cell n1 is under NES_2, Qn1,2 is +3 dB;

[0286] - When neighbor cell n2 is under NES_1, Qn1,1 is +3 dB; and

[0287] - When neighbor cell n2 is NES_2, Qn1,2 is -4 dB.

[0288] For example, the cell (sub - ) state can be notified to the UE via MAC CE / DCI as follows:

[0289] - Field 1 = freq1 (intra - frequency);

[0290] - Field 2 = PCI_n1; and

[0291] - Field d3 = NES_1.

[0292] The following Table 8 shows the combined values of the R values (i.e., (R s ,R - n ) used by the UE for cell reselection:

[0293] [Table 8]

[0294]

[0295] For example, at least one cell state may include one or more NES states including a cell DTX / DRX state and / or a cell shutdown state. In this case, i) the cell reselection condition related to the cell DTX / DRX state is looser than the reference cell reselection condition related to a non-NES state, and ii) the cell reselection condition related to the cell shutdown state is looser than the cell reselection condition related to the cell DTX / DRX state. To relax at least one cell reselection condition, at least one cell state-specific offset related to at least one cell state may be applied to one or more parameters of the reference cell reselection condition. For example, at least one cell state-specific offset may be applied to:

[0296] - The measurement value for the target cell to increase the cell ranking of the target cell by an increment relative to the non-NES state, where the increment is higher in the cell shutdown state than in the cell DTX / DRX state; and / or

[0297] - The measurement value for a cell other than the target cell to decrease the cell ranking of the cell by an amount relative to the non-NES state, where the decrement is higher in the cell shutdown state than in the cell DTX / DRX state.

[0298] In step S1107, the UE may perform cell reselection to the target cell based on satisfying the cell reselection condition of the target cell.

[0299] Figure 12 Shows an example of adjusting the execution conditions of conditional mobility according to the cell state according to an embodiment of the present disclosure.

[0300] Refer to Figure 12 , in step S1201, the UE may receive a configuration for one or more candidate target cells for conditional mobility. The configuration may be a conditional mobility command. The configuration may include the cell configuration for the target cell and information on multiple execution conditions for the target cell. Information on multiple execution conditions may be received via RRC signaling and / or SIB broadcast.

[0301] Information on multiple execution conditions may include multiple execution conditions and multiple cell state IDs, each of the multiple cell state IDs being associated with a corresponding execution condition, as shown in Table 9:

[0302] [Table 9]

[0303]

[0304] If the cell state information including information for multiple execution conditions is configured for the UE via RRC signaling and / or SIB broadcast, this step may be omitted. In step S1203, the UE may receive the cell state information for the serving cell and / or one or more neighbor cells.

[0305] For example, the cell state information may be provided to the UE via RRC signaling and / or SIB broadcast. For each frequency, the cell state information may be defined for a cell list and include the following information elements (IEs) as shown in Table 10:

[0306] [Table 10]

[0307]

[0308] In Table 10, Qoffset j is a cell and / or state specific offset. Instead of Qoffset j , a state specific Qoffset j may be configured for a group of neighbor cells. The cell state ID may indicate the cell state between the non - NES state and the NES state.

[0309] For example, the cell state information may be provided to the UE via MAC CE and / or DCI. The MAC CE and / or DCI may include at least one of the following:

[0310] - Field 1: Short frequency ID (may be omitted for in - frequency cells);

[0311] - Field 2: Short cell ID; or

[0312] - Field 3: Cell state ID.

[0313] Since the MAC CE / DCI may carry limited information, the UE may be (pre)configured via dedicated RRC signaling and / or SIB broadcast with the following associated information:

[0314] - Association between the short frequency ID and the actual frequency identifier (ARFCN);

[0315] - Association between the short cell ID and the actual cell ID (e.g., PCI);

[0316] - Association between the cell state ID and Qffset;

[0317] - Association between {cell ID, cell state ID} and Qoffset; or

[0318] - IE, as shown in Table 10 above.

[0319] That is to say, when receiving the MAC CE / DCI carrying the cell status information in step S1203, the associated information can be received via RRC signaling and / or SIB broadcast before step S1203. For example, the associated information can be included in the information of multiple execution conditions received in step S1201.

[0320] As long as the UE receives the cell status information, the UE can determine whether the cell status information is valid. For example, the cell status information is valid within a specific duration, where the duration can be configurable until it is overwritten by new information for the same cell. As another example, the cell status information is valid until it is overwritten by new information for the same cell.

[0321] In step S1205, the UE can evaluate the mobility execution conditions for the candidate cells. The UE can evaluate at least one execution condition related to at least one cell status / cell status ID notified by the cell status information. For example, the UE can determine at least one cell status specific offset (e.g., Qoffset) related to at least one cell status / cell status ID based on the associated information in the information of multiple execution conditions. The at least one cell status specific offset can include the cell status specific offset for the serving cell and / or one or more cell status specific offsets for one or more neighbor cells. Then, the UE can determine at least one execution condition for the target cell based on one or more parameters that apply the at least one cell status specific offset to at least one reference execution condition.

[0322] For the evaluation, the UE can determine the measurement metrics including the execution condition metric for the serving cell (i.e., serving cell execution condition metric, R s ) and / or one or more execution condition metrics for one or more neighbor cells (i.e., neighbor cell execution condition metric, R n ) as follows:

[0323] R s =Q meas，s +Q hyst -Qoffset temp ; and

[0324] R n =Q meas，n -Qoffset-Qoffset temp .

[0325] For example, the execution condition for the target cell can be the event A3 condition that R n for the target cell is higher than R s plus the offset threshold by at least the trigger time (TTT). In this case:

[0326] 1) R s and R n can be expressed as:

[0327] R s = Q meas，s + Q hyst - Qoffset temp + Qs,j; and

[0328] R n = Q meas，n - Qoffset - Qoffset temp + Qn,j, where

[0329] Qs,j: Qoffset for the serving cell in NES state j; and

[0330] Qn,j: Qoffset for neighbor cell n in NES state j.

[0331] The cell state specific offset Qs,j is interpreted as being applied to R s , Q meas,s , Q hyst and / or Qoffset temp . The cell state specific offset Qn,j is interpreted as being applied to R n , Q meas,n , Qoffset and / or Qoffset temp . If the cell state is unknown or considered invalid, Qx,j is zero;

[0332] 2) At least one cell state specific offset can be applied to the offset threshold; and / or

[0333] 3) At least one cell state specific offset can be applied to the TTT.

[0334] For example, the execution condition for the target cell can be the event A5 condition, i.e., where i) R for the target cell n is higher than the target cell threshold, and ii) the state where R s is lower than the source cell threshold persists for at least TTT. In this case:

[0335] 1) R s and R n can be expressed as:

[0336] R s = Q meas，s + Q hyst - Qoffset temp + Q s，j ; and

[0337] Rn = Q meas，n - Qoffset - Qoffset temp + Qn,j, where

[0338] Qs,j: Qoffset for the serving cell in NES state j; and

[0339] Qn,j: Qoffset for neighbor cell n in NES state j.

[0340] The cell state specific offset Qs,j is interpreted as being applied to R s 、Q meas,s 、Q hyst and / or Qoffset temp 。The cell state specific offset Qn,j is interpreted as being applied to R n 、Q meas,n 、Qoffset and / or Qoffset temp 。If the cell state is unknown or considered invalid, Qx,j is zero;

[0341] 2) At least one cell state specific offset can be applied to the target cell threshold;

[0342] 3) At least one cell state specific offset can be applied to the source cell threshold; and / or

[0343] 4) At least one cell state specific offset can be applied to the TTT.

[0344] When at least one cell state specific offset is related to a non - NES state (i.e., NES_off state), at least one cell state specific offset can be set to zero.

[0345] For example, at least one cell state can include one or more NES states, including the cell DTX / DRX state and / or the cell shutdown state. In this case, i) the execution condition related to the cell DTX / DRX state is looser than the reference execution condition related to the non - NES state, and ii) the execution condition related to the cell shutdown state is looser than the execution condition related to the cell DTX / DRX state.

[0346] To relax at least one execution condition, at least one cell state specific offset related to at least one cell state can be applied to one or more parameters of the reference execution condition. For example, at least one cell state specific offset can be applied to:

[0347] - The measurement value for the target cell, which increases the measurement value for the target cell by an increment relative to the non - NES state, where the increment is higher in the cell shutdown state than in the cell DTX / DRX state;

[0348] - For the measurement value of the source cell, it reduces the measurement value of the source cell by a decrement relative to the non-NES state, where the decrement is higher in the cell closed state than in the cell DTX / DRX state;

[0349] - Offset threshold, which reduces the offset threshold by a decrement relative to the non-NES state, where the decrement is higher in the cell closed state than in the cell DTX / DRX state;

[0350] - Source cell threshold, which increases the source cell threshold by an increment relative to the non-NES state, where the increment is higher in the cell closed state than in the cell DTX / DRX state;

[0351] - Target cell threshold, which reduces the target cell threshold by a decrement relative to the non-NES state, where the decrement is higher in the cell closed state than in the cell DTX / DRX state; and / or

[0352] - TTT, which reduces the TTT by a decrement relative to the non-NES state, where the decrement is higher in the cell closed state than in the cell DTX / DRX state.

[0353] In step S1207, the UE can perform mobility to the target cell based on meeting the execution conditions for the target cell. The UE can apply the cell configuration for the target cell based on meeting the execution conditions for the target cell.

[0354] In some implementations, to support the network in prohibiting traditional UEs from accessing NES, the following options can be considered:

[0355] Option A) Intra / InterFreqExcludedCellList;

[0356] Option B) cellBarred; and / or

[0357] Option C) Cell reservation field in MIB / SIB.

[0358] 1. Option A

[0359] xxxExcludedCellList should be configured to include NES cells so that traditional UEs exclude NES cells from the cell reselection candidates.

[0360] UEs with NES capabilities should ignore the ExcludedCellList so that they can consider NES cells as cell reselection candidate cells.

[0361] The use of xxxexcludedCellList should also support NES-capable UEs. Therefore, another ExcludedCellList (e.g., ExcludedCellListNES) applicable only to NES-capable UEs can be introduced in SIB / 4.

[0362] Option A can prevent traditional UEs from reselecting NES cells, but this option cannot prevent traditional UEs from selecting and camping on NES cells.

[0363] 2. Option B

[0364] cellBarred in the MIB of NES cells should be set to prohibited. NES-capable UEs should ignore cellBarred.

[0365] Access control for NES-capable UEs should be supported based on a 1-bit prohibition mechanism. Then, another cellBarred field (e.g., cellBarredNES) applicable only to NES-capable UEs can be introduced in SIB1.

[0366] This solution can effectively prevent traditional UEs from camping on NES cells. This mechanism is used to control access for NTN UEs and access from RedCap UEs. This solution cannot prevent traditional UEs from first reselecting NES cells. Traditional UEs will attempt to camp on NES cells by obtaining the MIB and then leave the NES cell only after recognizing the prohibited cellBarred.

[0367] If further optimized to prevent traditional UEs from first reselecting NES cells, Option A can be further considered, but this optimization is not considered necessary. That is, Solution B is sufficient.

[0368] 3. Option C

[0369] To prohibit traditional UEs without NPN capabilities from NES cells, cellReservationForOtherUse should be set to true in NES cells. To prohibit UEs with NPN capabilities from NES cells, cellReservationForFutureUse should be set to true in NES cells. NES-capable UEs should ignore both cellReservationForOtherUse and cellReservationForFutureUse in NES cells.

[0370] To control the access of UEs with NPN and NES combined capabilities from NPN+NES cells, a new cell reservation field (e.g., cellReservationForFutureUse2) can be introduced. If this field does not exist, the UE shall consider the cell not reserved. Otherwise, the UE shall consider the cell prohibited.

[0371] This option can prevent traditional UEs from camping on NES cells. The access restriction based on cell reservation in NES cells should be built on top of the existing access control process used for access control in NPN cells, which slightly complicates the access control mechanism in NES cells.

[0372] Option C can work, but this option is not preferred because other options like Option B are simple and sufficient.

[0373] By comparing these solutions, it can be seen that only Option B is sufficient to prevent traditional UEs from accessing NES cells. If Option B is adopted, a new cell barred field needs to be introduced in SIB1, and this field is only applicable to UEs with NES capabilities.

[0374] In summary:

[0375] - The NES cell can set cellBarred in the MIB to prohibited to prevent traditional UEs from accessing the NES cell. UEs with NES capabilities ignore cellBarred.

[0376] - Introduce a new cell barred field in SIB1 that is only applicable to UEs with NES capabilities. If this field is set to prohibited, UEs with NES capabilities shall consider the cell prohibited.

[0377] - It is not necessary to configure the xxxExcludedCellList including NES cells to help traditional UEs avoid reselection to NES cells.

[0378] In some implementations, the network should be able to configure UEs with NES capabilities to (de-)prioritize NES cells. Mechanisms for both frequency and cell-level cell selection / reselection (de-)prioritization can be considered.

[0379] In some implementations, it may be a question whether any new cell reselection mechanism for prioritizing or deprioritizing NES cells is needed. Cell reselection within NR is limited to the frequencies listed in SIB3 and SIB4. The current network can configure Qoffset to prioritize or deprioritize specific cells in SIB3 / 4 for cell reselection. Qoffset can be configured for each neighbor cell included in the same-frequency neighbor cell information in SIB3 and the equal-priority frequency inter-neighbor cell information in SIB4, and the range of Qoffset is from -24 dB to +24 dB, which is sufficient to achieve relative (de)prioritization by using a smaller |Qoffset| value or even by using a larger |Offset| value. Therefore, Qoffset is applicable for prioritizing or deprioritizing NES cells for cell reselection. Qoffset can also be applicable to legacy UEs.

[0380] That is to say, Qoffset can be applicable for prioritizing or deprioritizing NES cells for cell reselection.

[0381] If the network wants to apply different prioritization strategies for legacy UEs and UEs with NES capabilities, for example, deprioritizing NES cells by legacy UEs while prioritizing NES cells by UEs with NES capabilities, since Qoffset is a broadcast parameter, Qoffset does not work well.

[0382] That is to say, if the network wants to apply a common prioritization strategy for legacy UEs and UEs with NES capabilities, then Qoffset is useful. If the network wants to apply different prioritization strategies for legacy UEs and UEs with NES capabilities, then the existing Qoffset is useless.

[0383] To implement a differentiated prioritization strategy, the simplest way is to introduce another Qoffset (e.g., QoffsetNES) that is only applicable to UEs with NES capabilities. The network configures the existing Qoffset to control the reselection of legacy UEs and a new offset (OffsetNES) to control the reselection of UEs with NES capabilities. Then, UEs with NES capabilities should ignore the existing Qoffset but instead apply QoffsetNES.

[0384] In summary:

[0385] - If the network wants to apply a common prioritization strategy for legacy UEs and UEs with NES capabilities, the offset works well.

[0386] - The differential prioritization and ranking strategies for NES cells can be applied to traditional UEs and UEs with NES capabilities respectively (e.g., de-prioritize NES cells by traditional UEs and prioritize NES cells by UEs with NES capabilities, and vice versa).

[0387] - If differential cell reselection prioritization strategies for traditional UEs and UEs with NES capabilities are supported respectively, a new Qoffset dedicated to UEs with NES capabilities (e.g., QoffsetNES) is introduced. UEs with NES capabilities ignore the existing Qoffset but instead apply QoffsetNES.

[0388] In addition, the methods described from the perspective of a UE in this disclosure (e.g., Figure 9 in) can be performed by Figure 2 the first wireless device 100 shown in Figure 3 and / or the UE 100 shown in

[0389] More specifically, a UE includes at least one transceiver, at least one processor, and at least one computer memory that is operatively connected to the at least one processor and stores instructions that perform operations when executed by the at least one processor.

[0390] The operations include: receiving information for a plurality of mobility conditions for a target cell, where each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

[0391] In addition, the methods described from the perspective of a UE in this disclosure (e.g., in Figure 9 can be performed by software code 105 stored in the memory 104 included in the first wireless device 100 shown in Figure 2 .

[0392] More specifically, at least one computer readable medium (CRM) stores instructions that perform operations based on being executed by at least one processor, the operations including: receiving information for multiple mobility conditions for a target cell, wherein each of the multiple mobility conditions is related to a corresponding cell state among multiple cell states; receiving information for at least one cell state among the multiple cell states; evaluating at least one mobility condition related to at least one cell state among the multiple mobility conditions; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

[0393] In addition, in this disclosure (for example, Figure 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.

[0394] 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, the operations including: receiving information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition associated with at least one cell state among the plurality of mobility conditions; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

[0395] In addition, in the present disclosure (for example, Figure 10 The method described from the perspective of network nodes can be Figure 2 The second wireless device 200 shown in FIG.

[0396] 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.

[0397] The operations include: sending information for a plurality of mobility conditions for a target cell to a user equipment (UE), wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; and sending information for at least one cell state among the plurality of cell states to the UE, wherein at least one mobility condition associated with the at least one cell state is evaluated among the plurality of mobility conditions, and wherein mobility to the target cell is performed based on satisfying the mobility condition among the at least one mobility condition.

[0398] The present disclosure can have various beneficial effects.

[0399] For example, when a base station associated with a cell operates multiple NES states, the UE can evaluate the mobility conditions associated with the NES state for the cell to enter to achieve optimal mobility.

[0400] The beneficial effects that can be obtained through the specific embodiments of the present disclosure are not limited to the beneficial effects listed above. For example, there can be various technical effects that can be understood and / or deduced by those of ordinary skill in the relevant art from the present disclosure. Therefore, the specific effects of the present disclosure are not limited to those explicitly described herein, but can include various effects that can be understood or deduced from the technical features of the present disclosure.

[0401] The claims in the present disclosure can be combined in various ways. For example, the technical features in the method claims of the present disclosure can be combined to be implemented or executed in a device, and the technical features in the device claims can be combined to be implemented or executed in a method. In addition, the technical features in the method claims and the device claims can be combined to be implemented or executed in a device. In addition, the technical features in the method claims and the device claims can be combined to be implemented or executed in a method. Other implementation manners 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 steps of: receiving information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is related to a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is related to the at least one cell state; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

2. The method according to claim 1, wherein the information for the plurality of mobility conditions is received via radio resource control (RRC) signaling, and wherein the information for the at least one cell state is received via medium access control (MAC) control element (CE) signaling or downlink control information (DCI).

3. The method according to claim 1, wherein the mobility includes cell reselection, and wherein the plurality of mobility conditions includes a cell reselection condition, and the cell reselection condition is: the cell ranking value for the target cell is the highest among the cell ranking value for the serving cell and the one or more cell ranking values for one or more neighbor cells; or based on the cell ranking value for the target cell belonging to one or more cell ranking values for cells within a threshold range from the highest cell ranking value, the number of good beams of the target cell is the highest among the cells.

4. The method according to claim 1, wherein the mobility includes conditional mobility, wherein the plurality of mobility conditions includes an execution condition for the conditional mobility, and wherein the execution condition is related to at least one of a measurement value for the target cell, a measurement value for the serving cell, one or more thresholds, or a triggering time to trigger (TTT).

5. The method according to claim 1, wherein the execution condition includes at least one of the following items: an event A2 condition, and the event A2 condition is that the measurement value for the serving cell is lower than a source cell threshold; an event A3 condition, and the event A3 condition is that the measurement value for the target cell is higher than the measurement value for the serving cell plus an offset threshold by at least the TTT; an event A4 condition, and the event A4 condition is that the measurement value for the target cell is higher than a target cell threshold; or an event A5 condition, and the event A5 condition is that the state where the measurement value for the target cell is higher than a target cell threshold and the measurement value for the serving cell is lower than a source cell threshold lasts for at least the TTT.

6. The method according to claim 1, wherein the information for the plurality of mobility conditions includes: the plurality of mobility conditions; and a plurality of cell state identifiers (IDs), and each of the plurality of cell state IDs is related to a corresponding mobility condition, and Wherein, the method further comprises the following steps: identifying at least one mobility condition related to the at least one cell state based on at least one matching cell state ID.

7. The method according to claim 1, Wherein, The information for the plurality of mobility conditions includes: A plurality of offsets; and A plurality of cell state identifier IDs, each of the plurality of cell state IDs being associated with a corresponding offset, and Wherein, the method further comprises the following steps: Identifying at least one offset related to the at least one cell state based on at least one matching cell state ID; and Determining the at least one mobility condition based on applying the at least one offset to one or more parameters of a reference mobility condition.

8. The method according to claim 7, Wherein, Based on the at least one offset being applied to the one or more parameters, relaxing the at least one mobility condition with respect to the reference mobility condition, and Wherein the one or more parameters include at least one of the following: a cell ranking value for the target cell, a cell ranking value for the serving cell, a cell ranking value for at least one neighbor cell other than the target cell, a measurement value for the target cell, a measurement value for the serving cell, an offset threshold, a source cell threshold, a target cell threshold, or a trigger time TTT.

9. The method according to claim 1, Wherein, The plurality of cell states include a non-network energy saving (NES) state, a first NES state, and a second NES state, and Wherein the first NES state and the second NES state are sub-states of the NES state.

10. The method according to claim 9, Wherein, The non-NES state is a state where all durations are active durations, Wherein the first NES state is a state that periodically repeats a cycle of the active duration and the inactive duration, and Wherein the second NES state is a state where all durations are the inactive durations.

11. The method according to claim 10, Wherein, During the active duration: The UE monitors at least one of a physical downlink control channel (PDCCH) or a semi-persistent scheduling (SPS) occasion; or The UE performs transmission on a configured grant (CG) resource, or transmits a scheduling request (SR); and Wherein, during the inactive duration: The UE does not monitor at least one of the PDCCH or the SPS occasion; or The UE does not perform transmission on the CG resource, or does not transmit the SR.

12. The method according to claim 9, Wherein, The at least one cell state includes at least one of the first NES state or the second NES state, Wherein the mobility condition related to the first NES state is looser than the reference mobility condition related to the non-NES state, and Wherein the mobility condition related to the second NES state is looser than the mobility condition related to the first NES state.

13. The method according to claim 9, Wherein, The non-NES state is a non-cell discontinuous transmission (DTX) / discontinuous reception (DRX) state, wherein the first NES state is a cell DTX / DRX state, and wherein the second NES state is a cell shutdown state.

14. The method according to claims 1 to 13, wherein, the UE communicates with at least one of a mobile device, a network, or an autonomous vehicle.

15. A user equipment (UE) configured to operate in a wireless communication system, the UE comprises: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively coupled to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations, the operations including: receiving information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on satisfying a mobility condition among the at least one mobility condition.

16. The UE according to claim 15, wherein, the UE is arranged to implement the method according to one of claims 2 to 14.

17. A network node configured to operate in a wireless communication system, the network node comprises: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively coupled to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations, the operations including: sending to a user equipment (UE) information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; and sending to the UE information for at least one cell state among the plurality of cell states, wherein at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state is evaluated, and wherein mobility to the target cell is performed based on satisfying a mobility condition among the at least one mobility condition.

18. A method performed by a network node configured to operate in a wireless communication system, the method comprises the steps of: sending to a user equipment (UE) information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; and sending to the UE information for at least one cell state among the plurality of cell states, wherein at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state is evaluated, and wherein mobility to the target cell is performed based on satisfying a mobility condition among the at least one mobility condition.

19. The method according to claim 18, wherein, the UE is arranged to implement the method according to one of claims 1 to 14.

20. A device adapted to operate in a wireless communication system, the device comprising: at least one processor; and at least one memory, the at least one memory being operatively coupled to the at least one processor and storing instructions, the instructions performing operations when executed by the at least one processor, the operations including: receiving information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

21. A non-transitory computer-readable medium CRM having program code stored thereon for implementing instructions, the instructions performing operations when executed by at least one processor, the operations including: receiving information for a plurality of mobility conditions for a target cell, wherein each of the plurality of mobility conditions is associated with a corresponding cell state among a plurality of cell states; receiving information for at least one cell state among the plurality of cell states; evaluating at least one mobility condition among the plurality of mobility conditions that is associated with the at least one cell state; and performing mobility to the target cell based on satisfying the mobility condition among the at least one mobility condition.

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