Mobility enhancements in wireless communication systems

Abstract

The invention relates to mobility enhancement in wireless communications. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes receiving a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells from a first cell, where each of the plurality of modified configurations is associated with a corresponding cell; identifying a modified configuration related to a second cell among the plurality of cells based on triggering mobility from the first cell to the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and a modified configuration related to the second cell.

Description

Technical Field

[0001] The present disclosure relates to mobility enhancement in wireless communications. Background Art

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

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

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

[0005] In wireless communication, a user equipment (UE) may perform mobility from a source cell to a target cell. For mobility, the UE may be configured with one or more cell configurations, and may perform mobility to the target cell based on applying the cell configuration for the target cell. The cell configuration of the target cell may be generated by applying an incremental configuration to the cell configuration of the serving cell. Summary of the invention

[0006] Solution to the problem

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

[0008] Another aspect of the present disclosure is to provide a method and apparatus for constructing a cell configuration for mobility in a wireless communication system.

[0009] According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes: receiving a reference configuration for multiple cells and multiple modified configurations for the multiple cells from a first cell, wherein each of the multiple modified configurations is related to a corresponding cell; based on triggering mobility from the first cell to a second cell among the multiple cells, identifying the modified configuration related to the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and the modified configuration related to the second cell.

[0010] According to an embodiment of the present disclosure, a user equipment (UE) configured to operate in a wireless communication system includes: at least one transceiver; at least one processor; and at least one memory, which is operatively connected to the at least one processor and stores instructions, wherein the instructions perform operations including the following items based on being executed by the at least one processor: receiving a reference configuration for multiple cells and multiple modified configurations for the multiple cells from a first cell, wherein each of the multiple modified configurations is related to a corresponding cell; based on triggering mobility from the first cell to a second cell among the multiple cells, identifying the modified configuration related to the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and the modified configuration related to the second cell.

[0011] According to an embodiment of the present disclosure, a network node associated with a first cell configured to operate in a wireless communication system includes: at least one transceiver; at least one processor; and at least one memory, which is operatively connected to the at least one processor and stores instructions, wherein the instructions perform operations including the following items based on being executed by the at least one processor: generating reference configurations for multiple cells and multiple modified configurations for the multiple cells, wherein each of the multiple modified configurations is associated with a corresponding cell; sending a radio resource control (RRC) reconfiguration message including the reference configuration and the multiple modified configurations to a user equipment (UE); and receiving an RRC reconfiguration complete message from the UE as a response to the RRC reconfiguration message, wherein the UE is configured to: based on triggering mobility from the first cell to a second cell among the multiple cells, identify the modified configuration associated with the second cell; and perform mobility from the first cell to the second cell based on the reference configuration and the modified configuration associated with the second cell.

[0012] According to an embodiment of the present disclosure, a method performed by a network node associated with a first cell configured to operate in a wireless communication system includes: generating a reference configuration for multiple cells and multiple modified configurations for the multiple cells, wherein each of the multiple modified configurations is associated with a corresponding cell; sending a radio resource control (RRC) reconfiguration message including the reference configuration and the multiple modified configurations to a user equipment (UE); and receiving an RRC reconfiguration complete message from the UE as a response to the RRC reconfiguration message, wherein the UE is configured to: based on triggering mobility from the first cell to a second cell among the multiple cells, identify the modified configuration associated with the second cell; and perform mobility from the first cell to the second cell based on the reference configuration and the modified configuration associated with the second cell.

[0013] According to an embodiment of the present disclosure, a device suitable for operating in a wireless communication system includes: at least a processor; and at least one memory, which is operatively connected to the at least one processor and stores instructions, wherein the instructions perform operations including the following items based on being executed by the at least one processor: receiving a reference configuration for multiple cells and a plurality of modified configurations for the multiple cells from a first cell, wherein each of the multiple modified configurations is related to a corresponding cell; based on triggering mobility from the first cell to a second cell among the multiple cells, identifying the modified configuration related to the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and the modified configuration related to the second cell.

[0014] According to an embodiment of the present disclosure, a non-transitory computer-readable medium (CRM) stores thereon a program code for implementing instructions, which executes operations including the following items based on being executed by at least one processor: receiving a reference configuration for multiple cells and multiple modified configurations for the multiple cells from a first cell, wherein each of the multiple modified configurations is related to a corresponding cell; based on triggering mobility from the first cell to a second cell among the multiple cells, identifying the modified configuration related to the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and the modified configuration related to the second cell.

[0015] The present disclosure may have various beneficial effects.

[0016] For example, the network may provide the UE with configurations for multiple candidate cells in a signaling efficient manner, not only for the upcoming mobility, but also for subsequent mobilities.

[0017] The beneficial effects that can be obtained by the specific embodiments of the present disclosure are not limited to the beneficial effects listed above. For example, there may be various technical effects that can be understood by a person skilled in the relevant art and / or derived from the present disclosure. Therefore, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that can be understood or derived from the technical features of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An example of a communication system to which an implementation of the present disclosure is applied is shown.

[0019] Figure 2 An example of a wireless device to which an implementation of the present disclosure is applied is shown.

[0020] Figure 3 An example of a UE to which an implementation of the present disclosure is applied is shown.

[0021] Figure 4 and Figure 5 An example of a protocol stack in a 3GPP-based wireless communication system to which an implementation of the present disclosure is applied is shown.

[0022] Figure 6 The frame structure in a 3GPP-based wireless communication system to which the implementation of the present disclosure is applied is shown.

[0023] Figure 7 An example of data flow in a 3GPP NR system to which an implementation of the present disclosure is applied is shown.

[0024] Figure 8 An example of a conventional handover process to which the technical features of the present disclosure can be applied is shown.

[0025] Fig. 9 An example of a conditional switching process to which the technical features of the present disclosure can be applied is shown.

[0026] Fig.10 An example of MTRP-based communication according to an embodiment of the present disclosure is shown.

[0027] Fig.11 An example of potential serving cell configuration according to an embodiment of the present disclosure is shown.

[0028] Fig.12 An example of a method performed by a UE according to an embodiment of the present disclosure is shown.

[0029] Fig.13 An example of a signal flow between a UE and a network node according to an embodiment of the present disclosure is shown.

[0030] Fig.14An example of a method for configuration adaptation associated with a mobility procedure according to an embodiment of the present disclosure is shown.

[0031] Fig.15 An example of configuration parameters of a cell according to an embodiment of the present disclosure is shown.

[0032] Fig.16 An example of configuration parameters of a cell before a serving cell change according to an embodiment of the present disclosure is shown.

[0033] Fig.17 An example of configuration parameters of a cell after a serving cell change according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0034] The following techniques, devices and systems can be applied to various wireless multiple access systems. Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and multi-carrier frequency division multiple access (MC-FDMA) systems. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE adopts OFDMA in the downlink (DL) and SC-FDMA in the uplink (UL). Evolutions of 3GPP LTE include LTE-Advanced (LTE-A), LTE-A Pro and / or 5G New Radio (NR).

[0035] For ease of description, the implementation of the present disclosure is mainly described with respect to a 3GPP-based wireless communication system. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP-based wireless communication system, various aspects of the present disclosure that are not limited to a 3GPP-based wireless communication system are applicable to other mobile communication systems.

[0036] For terms and techniques not specifically described among the terms and techniques adopted in the present disclosure, reference may be made to wireless communication standard documents published prior to the present disclosure.

[0037] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0038] In the present disclosure, a slash ( / ) or a comma (,) may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0039] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, the expression "at least one of A or B" or "at least one of A and / or B" in the present disclosure may be interpreted as being the same as "at least one of A and B".

[0040] In addition, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B and / or C" may mean "at least one of A, B, and C".

[0041] In addition, the brackets used in the present disclosure may mean "for example". In detail, when it is shown as "control information (PDCCH)", "PDCCH" may be cited as an example of "control information". In other words, in the present disclosure, "control information" is not limited to "PDCCH", and "PDCCH" may be cited as an example of "control information". In addition, even when it is shown as "control information (ie, PDCCH)", "PDCCH" may be cited as an example of "control information".

[0042] The technical features described separately in one figure in the present disclosure can be implemented separately or simultaneously.

[0043] Although not limited to this, the various descriptions, functions, processes, suggestions, methods and / or operational flowcharts of the present disclosure disclosed herein can be applied to various fields that require wireless communication and / or connection between devices (e.g., 5G).

[0044] 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.

[0045] Figure 1 An example of a communication system to which an implementation of the present disclosure is applied is shown.

[0046] Figure 1 The 5G usage scenarios shown are only exemplary, and the technical features of the present disclosure can be applied to Figure 1 Other 5G usage scenarios not shown.

[0047] The three main demand categories for 5G include: (1) enhanced mobile broadband (eMBB) category, (2) massive machine type communication (mMTC) category, and (3) ultra-reliable and low-latency communication (URLLC) category.

[0048] Reference Figure 1 , the communication system 1 includes wireless devices 100a to 100f, a base station (BS) 200, and a network 300. Figure 1 A 5G network is illustrated as an example of a network of the communication system 1, but implementations of the present disclosure are not limited to the 5G system and may be applied to future communication systems other than the 5G system.

[0049] BS 200 and network 300 may be implemented as wireless devices, and a specific wireless device may operate as a BS / network node relative to other wireless devices.

[0050] The wireless devices 100a to 100f represent devices that perform communication using a radio access technology (RAT) (e.g., 5G NR or LTE) and may be referred to as communication / radio / 5G devices. The wireless devices 100a to 100f may include, but are not limited to, a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. A vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters.

[0051] In the present disclosure, the wireless devices 100a to 100f may be referred to as user equipment (UE). UE may include, for example, a cellular phone, a smart phone, a laptop computer, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a plate-shaped personal computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle with an autonomous driving function, a connected car, a UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a FinTech device (or a financial device), a security device, a weather / environmental device, a device related to 5G services, or a device related to the field of the fourth industrial revolution.

[0052] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a super 5G network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS 200 / network 300. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0053] Wireless communication / connection 150a, 150b, and 150c may be established between wireless devices 100a to 100f and / or between wireless devices 100a to 100f and BS200 and / or between BS200. Here, wireless communication / connection may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)), etc. The wireless devices 100a to 100f and BS200 / wireless devices 100a to 100f may send / receive radio signals to / from each other through wireless communication / connection 150a, 150b, and 150c. For example, wireless communication / connection 150a, 150b, and 150c may send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of the resource allocation process can be performed based on various proposals of the present disclosure.

[0054] NR supports multiple numerologies (and / or multiple subcarrier spacings (SCS)) to support various 5G services. For example, if the SCS is 15kHz, wide areas can be supported in traditional cellular bands, while if the SCS is 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. If the SCS is 60kHz or higher, bandwidths greater than 24.25GHz can be supported to overcome phase noise.

[0055] The NR frequency band may be defined as two types of frequency ranges, namely, frequency range 1 (FR1) and frequency range 2 (FR2). The numerical values ​​of the frequency ranges may be changed. For example, the two types of frequency ranges (FR1 and FR2) may be as shown in Table 1 below. For ease of explanation, in the frequency range used in the NR system, FR1 may mean "a range below 6 GHz", FR2 may mean "a range above 6 GHz", and may be referred to as millimeter wave (mmW).

[0056] [Table 1]

[0057] Frequency range name Corresponding frequency range Subcarrier spacing FR1 450MHz-6000MHz 15, 30, 60kHz FR2 24250MH-52600MHz 60, 120, 240kHz

[0058] As described above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a frequency band of 410 MHz to 7125 MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or higher. For example, a frequency band of 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or more included in FR1 may include an unlicensed frequency band. The unlicensed frequency band may be used for various purposes, for example, for communication of vehicles (e.g., autonomous driving).

[0059] [Table 2]

[0060] Frequency range name Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0061] Here, the radio communication technology implemented in the wireless device in the present disclosure may include narrowband Internet of Things (NB-IoT) technology for low power communication and LTE, NR and 6G. For example, NB-IoT technology may be an example of low power wide area network (LPWAN) technology, which may be implemented in specifications such as LTE Cat NB1 and / or LTE CatNB2, and may not be limited to the above names. Additionally and / or alternatively, the radio communication technology implemented in the wireless device in the present disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology, and may be called by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented in at least one of various specifications, such as 1) LTE Cat 0, 2) LTE CatM1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and may not be limited to the above names. Additionally and / or alternatively, the radio communication technology implemented in the wireless device in the present disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN considering low power communication, and may not be limited to the above names. For example, ZigBee technology may generate a personal area network (PAN) associated with small / low power digital communication based on various specifications (such as IEEE 802.15.4), and may be referred to as various names. Figure 2 An example of a wireless device to which an implementation of the present disclosure is applied is shown.

[0062] exist Figure 2 In the embodiment, the first wireless device 100 and / or the second wireless device 200 may be implemented in various forms according to the usage / service. For example, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 1 At least one of {wireless devices 100a to 100f and BS200}, {wireless devices 100a to 100f and wireless devices 100a to 100f} and / or {BS200 and BS200}. The first wireless device 100 and / or the second wireless device 200 may be configured by various elements, devices / components and / or modules.

[0063] The first wireless device 100 may include at least one transceiver (eg, transceiver 106 ), at least one processing chip (eg, processing chip 101 ), and / or one or more antennas 108 .

[0064] The processing chip 101 may include at least one processor (eg, the processor 102 ) and at least one memory (eg, the memory 104 ). Additionally and / or alternatively, the memory 104 may be placed outside the processing chip 101 .

[0065] The processor 102 may control the memory 104 and / or the transceiver 106, and may be adapted to implement the descriptions, functions, processes, suggestions, methods, and / or operational flow charts described in the present disclosure. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then send a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104.

[0066] The memory 104 may be operatively connected to the processor 102. The memory 104 may store various types of information and / or instructions. The memory 104 may store firmware and / or software code 105 that implements codes, commands, and / or command sets that, when executed by the processor 102, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 105 may control the processor 102 to execute one or more protocols. For example, the firmware and / or software code 105 may control the processor 102 to execute one or more layers of a wireless interface protocol.

[0067] In this document, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, the first wireless device 100 may represent a communication modem / circuit / chip.

[0068] The second wireless device 200 may include at least one transceiver (eg, transceiver 206 ), at least one processing chip (eg, processing chip 201 ), and / or one or more antennas 208 .

[0069] The processing chip 201 may include at least one processor (eg, the processor 202 ) and at least one memory (eg, the memory 204 ). Additionally and / or alternatively, the memory 204 may be placed outside the processing chip 201 .

[0070] The processor 202 may control the memory 204 and / or the transceiver 206, and may be adapted to implement the descriptions, functions, processes, suggestions, methods, and / or operational flow charts described in the present disclosure. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then send a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204.

[0071] The memory 204 may be operatively connected to the processor 202. The memory 204 may store various types of information and / or instructions. The memory 204 may store firmware and / or software code 205 that implements codes, commands, and / or command sets that, when executed by the processor 202, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure. For example, the firmware and / or software code 205 may control the processor 202 to execute one or more protocols. For example, the firmware and / or software code 205 may control the processor 202 to execute one or more layers of a wireless interface protocol.

[0072] In this article, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each of the transceivers 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0073] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). One or more processors 102 and 202 may generate one or more protocol data units (PDUs), one or more service data units (SDUs), messages, control information, data, or information according to the descriptions, functions, processes, suggestions, methods, and / or operation flow charts disclosed in the present disclosure. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in the present disclosure and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in the present disclosure.

[0074] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. For example, one or more processors 102 and 202 may be configured by a group of communication control processors, application processors (APs), electronic control units (ECUs), central processing units (CPUs), graphics processing units (GPUs), and memory control processors.

[0075] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be configured by random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EPROM), flash memory, volatile memory, non-volatile memory, hard drive, register, cache memory, computer-readable storage medium, and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired connection or wireless connection.

[0076] One or more transceivers 106 and 206 can send the user data, control information and / or radio signal / channel mentioned in the description, function, process, suggestion, method and / or operation flow chart disclosed in the present disclosure to one or more other devices. One or more transceivers 106 and 206 can receive the user data, control information and / or radio signal / channel mentioned in the description, function, process, suggestion, method and / or operation flow chart disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can send user data, control information or radio signal to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can receive user data, control information or radio signal from one or more other devices.

[0077] One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. Additionally or alternatively, one or more transceivers 106 and 206 may include one or more antennas 108 and 208. One or more transceivers 106 and 206 may be adapted to transmit and receive user data, control information, and / or radio signals / channels mentioned in the description, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure through one or more antennas 108 and 208. In the present disclosure, one or more antennas 108 and 208 may be multiple physical antennas or multiple logical antennas (e.g., antenna ports).

[0078] One or more transceivers 106 and 206 may convert received user data, control information, radio signals / channels, etc. from RF band signals to baseband signals, so as to process the received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters. For example, one or more transceivers 106 and 206 may up-convert OFDM baseband signals to OFDM signals through their (analog) oscillators and / or filters under the control of one or more processors 102 and 202 and transmit the up-converted OFDM signals at the carrier frequency. One or more transceivers 106 and 206 may receive an OFDM signal at a carrier frequency and down-convert the OFDM signal to an OFDM baseband signal through their (analog) oscillators and / or filters under the control of one or more processors 102 and 202 .

[0079] although Figure 2 140 . Although not shown in the figure, the wireless devices 100 and 200 may also include additional components. The additional components 140 may be configured differently depending on the type of the wireless devices 100 and 200. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) device (e.g., an audio I / O port, a video I / O port), a drive device, and a computing device. The additional components 140 may be connected to one or more processors 102 and 202 via various technologies such as a wired or wireless connection.

[0080] In an implementation of the present disclosure, a UE may be used as a transmitting device in an uplink (UL) and a receiving device in a downlink (DL). In an implementation of the present disclosure, a BS may be used as a receiving device in the UL and a transmitting device in the DL. Hereinafter, for the convenience of description, it is mainly assumed that the first wireless device 100 is used as a UE and the second wireless device 200 is used as a BS. For example, a processor 102 connected to the first wireless device 100, installed on the first wireless device 100, or started in the first wireless device 100 may be adapted to perform UE behavior according to an implementation of the present disclosure or control the transceiver 106 to perform UE behavior according to an implementation of the present disclosure. A processor 202 connected to the second wireless device 200, installed on the second wireless device 200, or started in the second wireless device 200 may be adapted to perform BS behavior according to an implementation of the present disclosure or control the transceiver 206 to perform BS behavior according to an implementation of the present disclosure.

[0081] In this disclosure, a BS is also referred to as a Node B (NB), an eNode B (eNB), or a gNB.

[0082] Figure 3 An example of a UE to which an implementation of the present disclosure is applied is shown.

[0083] Reference Figure 3 , UE 100 may correspond to Figure 2 A first wireless device 100 is provided.

[0084] 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 .

[0085] The processor 102 may be adapted to implement the descriptions, functions, processes, suggestions, methods and / or operational flow charts disclosed in the present disclosure. The processor 102 may be adapted to control one or more other components of the UE 100 to implement the descriptions, functions, processes, suggestions, methods and / or operational flow charts disclosed in the present disclosure. The radio interface protocol layer may be implemented in the processor 102. The processor 102 may include an ASIC, other chipsets, logic circuits and / or data processing devices. The processor 102 may be an application processor. The processor 102 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), a modem (modulator and demodulator). Examples of the processor 102 may be at MANUFACTURED BY SNAPDRAGON TM Series processors, Manufactured by EXYNOS TM Series processors, A series of processors manufactured by Made by HELIO TM Series processors, ATOM manufactured TM series processors or the corresponding next-generation processors.

[0086] The memory 104 is connected to the processor 102 when in operation and stores various information to operate the processor 102. The memory 104 may include ROM, RAM, flash memory, memory card, storage medium and / or other storage devices. When the embodiment is implemented in software, the technology described herein can be implemented using modules (e.g., processes, functions, etc.) that execute the descriptions, functions, processes, suggestions, methods and / or operation flow charts disclosed in this disclosure. The modules can be stored in the memory 104 and implemented by the processor 102. The memory 104 can be implemented within the processor 102 or outside the processor 102 (in this case, the memory can be communicatively connected to the processor 102 via various means known in the art).

[0087] The transceiver 106 is connected to the processor 102 during operation and sends and / or receives radio signals. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include a baseband circuit to process radio frequency signals. The transceiver 106 controls one or more antennas 108 to send and / or receive radio signals.

[0088] The power management module 141 manages the power of the processor 102 and / or the transceiver 106. The battery 142 provides power to the power management module 141.

[0089] The display 143 outputs a result processed by the processor 102. The keypad 144 receives an input to be used by the processor 102. The keypad 144 may be displayed on the display 143.

[0090] The SIM card 145 is an integrated circuit designed to securely store an International Mobile Subscriber Identity (IMSI) number and its associated keys, which are used to identify and authenticate subscribers on mobile telephony devices such as mobile phones and computers. Contact information can also be stored on many SIM cards.

[0091] The speaker 146 outputs sound related results processed by the processor 102. The microphone 147 receives sound related input to be used by the processor 102.

[0092] Figure 4 and Figure 5 An example of a protocol stack in a 3GPP-based wireless communication system to which an implementation of the present disclosure is applied is shown.

[0093] Specifically, Figure 4 An example of a radio interface user plane protocol stack between a UE and a BS is illustrated, and Figure 5 An example of a radio interface control plane protocol stack between a UE and a BS is illustrated. The control plane refers to a path for transmitting control messages used to manage calls by the UE and the network. The user plane refers to a path for transmitting data generated in the application layer (for example, voice data or Internet packet data). Figure 4 , the user plane protocol stack can be divided into layer 1 (ie, PHY layer) and layer 2. Figure 5 , the control plane protocol stack can be divided into layer 1 (ie, PHY layer), layer 2, layer 3 (eg, RRC layer) and non-access stratum (NAS) layer. Layer 1, layer 2 and layer 3 are called access stratum (AS).

[0094] In the 3GPP LTE system, Layer 2 is separated into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, Layer 2 is separated into the following sublayers: MAC, RLC, PDCP, and SDAP. The PHY layer provides transport channels to the MAC sublayer, the MAC sublayer provides logical channels to the RLC sublayer, the RLC sublayer provides RLC channels to the PDCP sublayer, and the PDCP sublayer provides radio bearers to the SDAP sublayer. The SDAP sublayer provides Quality of Service (QoS) flows to the 5G core network.

[0095] In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing MAC SDUs belonging to one or different logical channels to / demultiplexing the transport blocks (TBs) delivered to / from the physical layer on the transport channel; scheduling information reporting; error correction through hybrid automatic repeat request (HARQ) (one HARQ entity per cell in the case of carrier aggregation (CA); priority handling between UEs with dynamic scheduling; priority handling between logical channels of a UE with logical channel prioritization; padding. A single MAC entity can support multiple parameter sets, transmission timings, and cells. Mapping restrictions in logical channel prioritization control which parameter set(s), cell, and transmission timing a logical channel can use.

[0096] MAC provides different types of data transmission services. In order to adapt to different types of data transmission services, multiple types of logical channels are defined, that is, each logical channel supports the transmission of a specific type of information. Each logical channel type is defined by what type of information is transmitted. Logical channels are divided into two groups: control channels and traffic channels. Control channels are only used for the transmission of control plane information, and traffic channels are only used for the transmission of user plane information. The broadcast control channel (BCCH) is a downlink logical channel for broadcasting system control information, the paging control channel (PCCH) is a downlink logical channel for transmitting paging information, system information change notifications, and indications of ongoing public warning services (PWS) broadcasts, the common control channel (CCCH) is a logical channel for sending control information between the UE and the network and for UEs that do not have an RRC connection with the network, and the dedicated control channel (DCCH) is a point-to-point bidirectional logical channel that sends dedicated control information between the UE and the network and is used by UEs with an RRC connection. The dedicated traffic channel (DTCH) is a point-to-point logical channel dedicated to one UE, which is used to transmit user information. DTCH can exist in both the uplink and downlink. In the downlink, there are the following connections between logical channels and transport channels: BCCH can be mapped to the broadcast channel (BCH); BCCH can be mapped to the downlink shared channel (DL-SCH); PCCH can be mapped to the paging channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH. In the uplink, there are the following connections between logical channels and transport channels: CCCH can be mapped to the uplink shared channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0097] The RLC sublayer supports three transmission modes: transparent mode (TM), unacknowledged mode (UM) and acknowledged mode (AM). RLC configuration is for each logical channel and does not depend on parameter sets and / or transmission duration. In 3GPP NR systems, the main services and functions of the RLC sublayer depend on the transmission mode and include: delivery of upper layer PDUs; sequence numbering independent of one of PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDUs (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

[0098] In the 3GPP NR system, the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using robust header compression (ROHC); transmission of user data; reordering and duplicate detection; in-sequence delivery; PDCP PDU routing (in the case of split bearers); retransmission of PDCP SDU; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status report for RLC AM; duplication of PDCP PDU and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transmission of control plane data; reordering and duplicate detection; in-sequence delivery; duplication of PDCP PDU and duplicate discard indication to lower layers.

[0099] In the 3GPP NR system, the main services and functions of SDAP include: mapping between QoS flows and data radio bearers; marking QoS flow ID (QFI) in both DL and UL packets. A single SDAP protocol entity is configured for each individual PDU session.

[0100] In the 3GPP NR system, the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by 5GC or NG-RAN; establishment, maintenance and release of RRC connection between UE and NG-RAN; security functions including key management; establishment, configuration, maintenance and release of signaling radio bearers (SRBs) and data radio bearers (DRBs); mobility functions (including: handover and context transfer; UE cell selection and reselection and control of cell selection and reselection; inter-RAT mobility); QoS management functions; UE measurement reporting and control of reporting; detection and repair of radio link failure; transmission of NAS messages from UE to NAS / from NAS to UE.

[0101] Figure 6 The frame structure in a 3GPP-based wireless communication system to which the implementation of the present disclosure is applied is shown.

[0102] Figure 6The frame structure shown is only exemplary, and the number of subframes, the number of time slots, and / or the number of symbols in a frame may vary. In a 3GPP-based wireless communication system, OFDM parameter sets (e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration) may be configured differently between multiple cells aggregated for one UE. For example, if the UE is configured with different SCSs for cells aggregated for the cells, the (absolute time) duration of time resources (e.g., subframes, time slots, or TTIs) including the same number of symbols may be different among the aggregated cells. In this article, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0103] Reference Figure 6 , downlink and uplink transmissions are organized into frames. Each frame has T f =10ms duration. Each frame is divided into two half-frames, where each half-frame has a duration of 5ms. Each half-frame includes 5 sub-frames, where the duration of each sub-frame is T sf is 1 ms. Each subframe is divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a cyclic prefix (CP). In a normal CP, each slot includes 14 OFDM symbols, and in an extended CP, each slot includes 12 OFDM symbols. The parameter set is based on an exponentially scalable subcarrier spacing βf=2 u *15kHz.

[0104] Table 3 shows the subcarrier spacing βf=2 u *N is the number of OFDM symbols per slot for normal CP of 15kHz slot symb , the number of time slots per frame N frame，u slot And the number of time slots N in each subframe subframe，u slot .

[0105] [Table 3]

[0106] u <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot <!-- 11 -->]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0107] Table 4 shows the subcarrier spacing βf=2 u *N number of OFDM symbols per slot for extended CP of 15kHz slot symb , the number of time slots per frame N frame，u slot And the number of time slots N in each subframesubframe，u slot .

[0108] [Table 4]

[0109] u <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 2 12 40 4

[0110] A slot includes a plurality of symbols (e.g., 14 or 12 symbols) in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, a common resource block (CRB) N indicated by higher layer signaling (e.g., RRC signaling) is defined. start,u grid Starting N size,u grid，x *N RB sc subcarriers and N subframe,u symb OFDM symbol resource grid, where N size,u grid，x N is the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for the downlink and UL for the uplink. RB sc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, N RB sc Typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL), there is one resource grid. The carrier bandwidth N for subcarrier spacing configuration u size,u grid Given by high-level parameters (e.g., RRC parameters). Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index 1 in the time domain that represents the symbol position relative to a reference point. In a 3GPP-based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain. Figure 6As shown, as the SCS doubles, the slot length and symbol length are halved. For example, when the SCS is 15kHz, the slot length is 1ms, which is the same as the subframe length. When the SCS is 30kHz, the slot length is 0.5ms (=500us), and the symbol length is half of the symbol length when the SCS is 15kHz. When the SCS is 60kHz, the slot length is 0.25ms (=250us), and the symbol length is half of the symbol length when the SCS is 30kHz. When the SCS is 120kHz, the slot length is 0.125ms (=125us), and the symbol length is half of the symbol length when the SCS is 60kHz. When the SCS is 240kHz, the slot length is 0.0625ms (=62.5us), and the symbol length is half of the symbol length when the SCS is 120kHz.

[0111] In the 3GPP NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For subcarrier spacing configuration u, CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB0 for subcarrier spacing configuration u coincides with "point A" used as a common reference point for the resource block grid. In the 3GPP NR system, PRBs are defined within a bandwidth part (BWP) and are numbered from 0 to N. size BWP,i -1 numbering, where i is the number of bandwidth parts. Physical resource blocks n in bandwidth part i PRB With common resource block n CRB The relationship between is as follows: PRB =n CRB +N size BWP,i , where N size BWP,i is a common resource block where the bandwidth part starts relative to CRB0. A BWP consists of multiple consecutive RBs. A carrier may include up to N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Only one BWP out of the multiple BWPs configured for a UE may be activated at a time. The active BWP defines the operating bandwidth of the UE within the operating bandwidth of the cell.

[0112] In the present disclosure, the term "cell" may refer to a geographical area where one or more nodes provide a communication system or to a radio resource. A "cell" as a geographical area may be understood as a coverage area in which a node can provide services using a carrier, and a "cell" as a radio resource (e.g., a time-frequency resource) is associated with a bandwidth as a frequency range configured by a carrier. A "cell" associated with a radio resource is defined by a combination of downlink resources and uplink resources (e.g., a combination of a DL component carrier (CC) and a ULCC). A cell may be configured only by downlink resources, or may be configured by downlink resources and uplink resources. Since the DL coverage (which is the range in which a node can send a valid signal) and the UL coverage (which is the range in which a node can receive a valid signal from a UE) depend on the carrier carrying the signal, the coverage of a node may be associated with the coverage of a "cell" of a radio resource used by the node. Therefore, the term "cell" may sometimes be used to represent the service coverage of a node, to represent a radio resource at other times, or to represent a range in which a signal using a radio resource can reach with effective strength at other times.

[0113] In CA, two or more CCs are aggregated. The UE can receive or transmit on one or more CCs simultaneously according to its capabilities. CA is supported for both continuous CCs and non-contiguous CCs. When CA is configured, the UE has only one RRC connection with the network. When the RRC connection is established / reestablished / switched, one serving cell provides NAS mobility information, and when the RRC connection is reestablished / switched, one serving cell provides security input. This cell is called the primary cell (PCell). PCell is a cell operating on the primary frequency, where the UE performs an initial connection establishment process or initiates a connection reestablishment process. Depending on the UE capabilities, the secondary cell (SCell) can be configured to form a set of serving cells together with the PCell. SCell is a cell that provides additional radio resources on top of a special cell (SpCell). Therefore, the set of configured serving cells for the UE always consists of one PCell and one or more SCells. For dual connection (DC) operation, the term SpCell refers to the PCell of the primary cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG). SpCell supports PUCCH transmission and contention-based random access and is always activated. MCG is a group of serving cells associated with a master node, which includes SpCell (PCell) and optionally one or more SCells. For UEs configured with DC, SCG is a subset of serving cells associated with a secondary node, which includes PSCell and zero or more SCells. For UEs in RRC_CONNECTED that are not configured with CA / DC, there is only one serving cell consisting of PCell. For UEs in RRC_CONNECTED that are configured with CA / DC, the term "serving cell" is used to refer to a set of cells consisting of SpCell and all SCells. In DC, two MAC entities are configured in the UE: one for MCG and one for SCG.

[0114] Figure 7 An example of data flow in a 3GPP NR system to which an implementation of the present disclosure is applied is shown.

[0115] Reference Figure 7 , "RB" means radio bearer, and "H" means header. Radio bearers are classified into two groups: DRB for user plane data and SRB for control plane data. MAC PDU is transmitted / received to / from an external device through the PHY layer using radio resources. MAC PDU arrives at the PHY layer in the form of a transport block.

[0116] In the PHY layer, uplink transport channels UL-SCH and RACH are mapped to their physical channels, physical uplink shared channel (PUSCH) and physical random access channel (PRACH), respectively, and downlink transport channels DL-SCH, BCH and PCH are mapped to physical downlink shared channel (PDSCH), physical broadcast channel (PBCH) and PDSCH, respectively. In the PHY layer, uplink control information (UCI) is mapped to physical uplink control channel (PUCCH), and downlink control information (DCI) is mapped to physical downlink control channel (PDCCH). The UE sends MAC PDU related to UL-SCH via PUSCH based on UL grant, and the BS sends MAC PDU related to DL-SCH via PDSCH based on DL assignment.

[0117] Hereinafter, a description is given regarding handover (HO).

[0118] The handover may include a PCell change. In addition, in the present disclosure, the description related to the handover may also be applied to other mobility procedures, such as a PSCell change (or a secondary node (SN) change) and / or a PSCell addition (or an SN addition).

[0119] Figure 8 An example of a conventional handover process to which the technical features of the present disclosure can be applied is shown.

[0120] Reference Figure 8 In step S801, the source RAN node may send a measurement control message to the UE. The source RAN node may configure the UE measurement process according to the roaming and access restriction information and, for example, the available multi-band information through the measurement control message. The measurement control information provided by the source RAN node through the measurement control message may assist in controlling the function of the connection mobility of the UE. For example, the measurement control message may include measurement configuration and / or reporting configuration.

[0121] In step S803, the UE may send a measurement report message to the source RAN node. The measurement report message may include the results of measurements of neighboring cells around the UE that may be detected by the UE. The UE may generate the measurement report message according to the measurement configuration and / or measurement control information in the measurement control message received in step S801.

[0122] In step S805, the source RAN node may make a handover (HO) decision based on the measurement report. For example, the source RAN node may make a HO decision and determine a target RAN node for HO among neighbor cells around the UE based on measurement results of neighbor cells (e.g., cell quality, signal quality, signal strength, reference signal received power (RSRP), reference signal received quality (RSRP), channel state, channel quality, signal to interference plus noise ratio (SINR)).

[0123] In step S807, the source RAN node may send a HO request message to the target RAN node determined in step S805. That is, the source RAN node may perform handover preparation with the target RAN node. The HO request message may include necessary information for preparing handover at the target RAN node.

[0124] In step S809, the target RAN node may perform admission control based on the information included in the HO request message. The target RAN node may configure and reserve the required resources (e.g., C-RNTI and / or RACH preamble). The AS configuration to be used in the target RAN node may be specified independently (i.e., "establish"), or as an increment compared to the AS configuration used in the source cell (i.e., "reconfigure").

[0125] In step S811, the target RAN node may send a HO request acknowledgement (ACK) message to the source RAN node. The HO request ACK message may include information about resources reserved and prepared for the handover. For example, the HO request ACK message may include a transparent container to be sent as an RRC message to the UE to perform the handover. The container may include a new C-RNTI, a target gNB security algorithm identifier for the selected security algorithm, a dedicated RACH preamble and / or possibly some other parameters, i.e., access parameters SIB. If RACH-free handover is configured, the container may include a timing adjustment indication and an optional pre-allocated uplink grant. If required, the HO request ACK message may also include RNL / TNL information for the forwarding tunnel. Data forwarding may be initiated once the source RAN node receives the HO request ACK message, or once the transmission of the handover command is initiated in the downlink.

[0126] In step S813, the source RAN node may send a handover command to the UE. For example, the handover command may include or may be a cell configuration (i.e., an RRCReconfiguration message including ReconfigurationWithSync). The RRCReconfiguration message and / or ReconfigurationWithSync of the target cell may include information required to access the target cell (i.e., access configuration), including the physical cell ID of the target cell, an identifier of the UE (i.e., C-RNTI), a HO validity timer (i.e., T304 timer), a target gNB security algorithm identifier for the selected security algorithm, a dedicated RACH resource set for contention-free random access (e.g., a dedicated random access preamble), an association between RACH resources and SSBs, an association between RACH resources and UE-specific CSI-RS configurations, common RACH resources, or at least one of system information of the target cell. The source RAN node may perform necessary integrity protection and encryption of the message.

[0127] In step S815, the UE may be handed over to the new cell, i.e., the target RAN node. The UE may be detached from the old cell (i.e., the source RAN node) and synchronized to the new cell (i.e., the target RAN node). The UE may perform handover from the source RAN node to the target RAN node based on the application cell configuration. For example, upon receiving the handover command, the UE may start the T304 timer and perform a contention-free random access towards the target RAN node based on a dedicated RACH resource set.

[0128] In step S817, upon successful completion of the random access procedure, the UE may stop the T304 timer and send a handover complete message (i.e., an RRCReconfigurationComplete message) to the target RAN node. The UE may send an RRCReconfigurationComplete message to the target RAN node to confirm the switched C-RNTI, indicating that the handover procedure for the UE is completed. The target RAN node may verify the C-RNTI sent in the RRCReconfigurationComplete message. The target RAN node may now start sending data to the UE. When random access fails and the T304 timer is still running, the UE may retry random access towards the target RAN node. When the T304 timer expires, the UE may declare a handover failure (HOF) and perform an RRC reestablishment procedure.

[0129] Fig. 9 An example of a conditional switching process to which the technical features of the present disclosure can be applied is shown.

[0130] Reference Fig. 9 In step S901, the source cell may send a measurement control message to the UE. The measurement control message may include a measurement configuration including a measurement configuration list, and each measurement configuration in the list includes a measurement identifier (ID), a corresponding measurement object, and a corresponding report configuration.

[0131] In step S903, the UE may send a measurement report message to the source cell. The measurement report message may include the result of measuring neighbor cells around the UE that can be detected by the UE. The UE may generate a measurement report message according to the measurement configuration and / or measurement control information in the measurement control message received in step S901.

[0132] In step S905, 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 for handover (e.g., target cell 1 and target cell 2) among neighbor cells around the UE based on measurement results (e.g., signal quality, reference signal received power (RSRP), reference signal received quality (RSRP)) of neighbor cells.

[0133] In step S907, the source cell may send a handover request message to the target cell 1 and the target cell 2 determined in step S905. That is, the source cell may perform handover preparation with the target cell 1 and the target cell 2. The handover request message may include necessary information for preparing the handover on the target side (e.g., the target cell 1 and the target cell 2).

[0134] In step S909, each of the target cell 1 and the target cell 2 may perform admission control based on the information included in the handover request message. The target cell may configure and reserve 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., "establishment") or as an increment compared to the AS configuration used in the source cell (i.e., "reconfiguration").

[0135] In step S911, the target cell and the target cell 2 may send a handover request confirmation (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 resources reserved and prepared for the handover. For example, the handover request ACK message may include a transparent container to be sent as an RRC message (i.e., an RRCReconfiguration message / cell configuration) to the UE to perform the handover. The container / cell configuration / RRCReconfiguration message may include information required to access the target cell (i.e., access configuration), which includes a physical cell ID of the target cell, an identifier of the UE (i.e., C-RNTI), a HO validity timer (i.e., a T304 timer), a target gNB security algorithm identifier for a selected security algorithm, a dedicated RACH resource set for contention-free random access (e.g., a dedicated random access preamble), an association between RACH resources and SSBs, an association between RACH resources and UE-specific CSI-RS configurations, common RACH resources, or at least one of system information of the target cell. If RACH-free handover is configured, the container may include a timing adjustment indication and optionally a pre-allocated uplink grant. If necessary, the handover request ACK message may also include RNL / TNL information for the forwarding tunnel. Data forwarding may be initiated once the source cell receives the handover request ACK message, or once the transmission of the conditional handover command is initiated in the downlink.

[0136] In step S913, the source cell may send an RRCReconfiguration message including a conditional reconfiguration to the UE. Conditional reconfiguration may also be referred to as (or may include) a conditional handover (CHO) configuration and / or a conditional handover command (e.g., a CHO command). The conditional reconfiguration may include a list of conditional reconfiguration / conditional handover commands, the list including a conditional reconfiguration / conditional handover command for each candidate target cell (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 the target cell may include an index / identifier identifying the corresponding conditional reconfiguration, a handover condition for the target cell, and / or a cell configuration for the target cell (i.e., an RRCReconfiguration message including ReconfigurationWithSync). The RRCReconfiguration message and / or ReconfigurationWithSync for the target cell may include information required to access the target cell, including the physical cell ID of the target cell, an identifier of the UE (i.e., C-RNTI), a HO validity timer (i.e., T304 timer), a target gNB security algorithm identifier for the selected security algorithm, a dedicated RACH resource set for contention-free random access (e.g., a dedicated random access preamble), an association between RACH resources and SSBs, an association between RACH resources and UE-specific CSI-RS configuration, common RACH resources, or at least one of system information of the target cell.

[0137] In step S915, the UE may evaluate the handover condition for the candidate target cells (e.g., target cell 1, target cell 2), and select the target cell for handover among the candidate target cells. For example, the UE may perform measurement on the candidate target cells, and determine whether the candidate target cells meet the handover condition of the candidate target cells among the candidate target cells based on the result of the measurement on the candidate target cells. Alternatively, the UE may determine whether the measurement result of the target cell / target cell meets the handover condition of the target cell. If the UE identifies that the target cell 1 meets the handover condition for the target cell 1, the UE may select the target cell 1 as the target cell for handover.

[0138] In step S917, the UE may detach from the old cell (i.e., the source cell) and synchronize to the new cell (i.e., the selected target cell). The UE may perform a handover from the source cell to the target cell based on the applied cell configuration. For example, upon receiving the handover command, the UE may start the T304 timer and perform a contention-free random access to the target cell based on a dedicated RACH resource set.

[0139] In step S919, upon successful completion of the random access procedure, the UE may stop the T304 timer and send a handover complete message (i.e., an RRCReconfigurationComplete message) to the target cell. The UE may send an RRCReconfigurationComplete message including a C-RNTI for confirming the handover to the target cell to indicate that the handover procedure for the UE is completed. The target RAN node may verify the C-RNTI sent in the RRCReconfigurationComplete message. The target RAN node may now start sending data to the UE. When random access fails and the T304 timer is still running, the UE may retry random access towards the target cell. When the T304 timer expires, the UE may declare a handover failure (HOF) and perform an RRC reestablishment procedure.

[0140] Fig.10 An example of MTRP-based communication according to an embodiment of the present disclosure is shown.

[0141] refer to Fig.10 , UE 1030 is connected to the network via an MTRP including TRP11010 and TRP21020. Each TRP may form a plurality of beams and communicate with UE 1030 via one or more beams among the plurality of beams. For example, TRP11010 may communicate with UE 1030 via beam 1040 among the plurality of beams formed by TRP11010, and TRP21020 may communicate with UE 1030 via beam 1050 among the plurality of beams formed by TRP21020.

[0142] The beam can be formed by radiation from multiple antenna elements in the antenna array of the TRP. The antenna array and / or at least one antenna element can be associated with one or more antenna ports. The antenna port can be defined so that the channel that transmits the symbol on the antenna port can be inferred from the channel that transmits another symbol on the same antenna port. That is, the antenna port is a logical concept, and the channel sent by a specific antenna port can be completed by using a reference signal assigned to the specific antenna port. This means that each antenna port has its own reference signal.

[0143] The beam may be represented as quasi co-location (QCL) information and / or transmission configuration indication (TCI) status.

[0144] In an example, the TRPs may be associated with the same physical cell identifier (ID), but located in different geographic locations.

[0145] In an example, TRPs may be differentiated based on a control resource set (CORESET). That is, different TRPs may be associated with different CORESETs / CORESET IDs.

[0146] In an example, TRPs may be differentiated based on TCI states. That is, different TRPs may be associated with different TCI states.

[0147] In an example, TRPs may be differentiated based on QCL information, that is, different TRPs may be associated with different QCL information.

[0148] In an example, TRPs may be differentiated based on beams. That is, different TRPs may be associated with different beams.

[0149] M-TRP (Multi-TRP) transmission

[0150] In multiple transmit / receive point (multi-TRP) operation, the serving cell can schedule UEs from two TRPs to provide better coverage, reliability and / or data rate for PDSCH, PDCCH, PUSCH and PUCCH.

[0151] There are two different operation modes to schedule multi-TRP PDSCH transmissions: single DCI and multi-DCI. For both modes, control of uplink and downlink operations can be done by the physical layer and MAC layer within the configuration provided by the RRC layer. In single DCI mode, the UE is scheduled by the same DCI for both TRPs, and in multi-DCI mode, the UE is scheduled by independent DCI from each TRP.

[0152] There are two different modes of operation for Multi-TRP PDCCH: PDCCH repetition and SFN-based PDCCH transmission. In both modes, the UE can receive two PDCCH transmissions carrying the same DCI, one for each TRP. In PDCCH repetition mode, the UE can receive two PDCCH transmissions carrying the same DCI from two associated search spaces, each associated with a different CORESET. In SFN-based PDCCH transmission mode, the UE can receive two PDCCH transmissions carrying the same DCI from a single search space / CORESET with different TCI states.

[0153] For multi-TRP PUSCH repetition, the UE performs PUSCH transmission of the same content to two TRPs with corresponding beam directions associated with different spatial relationships, based on the indication in a single DCI or in a semi-statically configured grant provided through RRC. For multi-TRP PUCCH repetition, the UE performs PUCCH transmission of the same content to two TRPs with corresponding beam directions associated with different spatial relationships.

[0154] For inter-cell multi-TRP operation, for multi-DCI PDSCH transmission, one or more TCI states can be associated with an SSB with a PCI different from the serving cell PCI. An activated TCI state can be associated with at most one PCI different from the serving cell PCI at a time.

[0155] The M-TRP sending method in which M TRPs send data to one user equipment (UE) may include sending eMBB M-TRP as a method of increasing the sending rate, and / or sending URLLC M-TRP as a method of increasing the reception success rate and reducing the delay.

[0156] In addition, from the perspective of downlink control information (DCI) transmission, the M-TRP (multi-TRP) transmission scheme may include i) M-TRP transmission based on M-DCI (multi-DCI), in which each TRP transmits different DCI, and / or ii) M-TRP transmission method based on S-DCI (single DCI), in which one TRP transmits DCI. For example, in the case of S-DCI, since all scheduling information of data transmitted by M TRPs must be transmitted through one DCI, it can be used in an ideal BH (ideal backhaul) environment, in which dynamic collaboration between two TRPs is possible.

[0157] In an mTRP environment, the phases or roles of multiple TRPs associated with a cell may not be the same.

[0158] For example, multiple TRPs can be classified into a primary TRP (p-TRP) and a secondary TRP (s-TRP), the primary TRP receives / monitors basic system information and sends and receives key control information, and the secondary TRP increases the diversity effect through data boosting or redundant transmission of the same data as the p-TRP.

[0159] For example, in UL transmit power allocation, p-TRP may allocate available power first, and s-TRP may allocate only the remaining transmit power.

[0160] For example, the p-TRP may be a TRP using a signal / channel associated with a physical cell ID obtained from the PSS / SSS, and the s-TRP may be a TRP using a signal / channel associated with another PCI. Typically, the p-TRP is basically configured in one serving cell, and an s-TRP associated with the serving cell may be optionally configured. When the s-TRP uses serving cell resources, the s-TRP may be referred to as an intra-cell s-TRP. When the s-TRP uses non-serving cell resources, the s-TRP may be referred to as an inter-cell s-TRP.

[0161] For example, a TRP that performs more accurate beam management by mainly performing BFD / RLM is defined as a p-TRP, and a TRP that is configured to perform looser BFD / RLM than the BFD / RLM performed in the p-TRP or not perform BFD / RLM operations may be defined as an s-TRP.

[0162] For example, when operating a service cell associated with multiple TRPs, the TRP used as the standard for DL / UL synchronization of multiple TRPs is defined as p-TRP, and the TRP that matches DL / UL synchronization by applying an offset based on the synchronization timing of the p-TRP can be defined as s-TRP.

[0163] In this way, if there is a difference between the operation performed in the p-TRP and the operation performed in the s-TRP, the difference between the p-TRP and the s-TRP may occur in the data transmission / reception performance or reliability of the link. When the types of data to be sent by the UE are different and different types of data occur at different times, it may be optimal for the UE to select the TRP to be used for data transmission based on the type / characteristics of the data. For example, in the case where the data requires relatively high reliability / low latency, the UE can use p-TRP to increase the probability of meeting the QoS requirements of the data, and for data requiring relatively low reliability / low latency, the UE can use s-TRP. Therefore, the UE can obtain the best compromise in terms of efficiency of multi-purpose TRP resources and satisfaction with transmission performance.

[0164] Meanwhile, if the network wants to trigger mobility from the serving cell to another cell / target cell, the network should provide the UE with the target cell configuration (ie, the cell configuration for the target cell) before initiating the mobility.

[0165] In some mobility events, the commonality between the source cell configuration and the target cell configuration may be high. For example, consider that a UE configured with a serving cell may be configured with two TRPs, where the serving cell provides primary TRP (pTRP) resources and the neighbor cell provides secondary TRP (sTRP) resources to the UE in some coordination with the serving cell. In the event of mobility between the cell providing the pTRP resources and the cell providing the sTRP, it would be beneficial to maintain multi-TRP operation after the mobility. For example, the pTRP and sTRP may become sTRP and pTRP, respectively, after the mobility. In order to maintain multi-TRP operation after the mobility, the network may have to provide TRP-related configurations in the mobility command. For TRP-related configurations, the network must generate TRP-related configurations for the target cell as the new serving cell and provide the generated configurations to the UE.

[0166] In the event of mobility from a serving cell (now the source cell) providing pTRP resources to a neighbor cell (now the target cell) providing sTRP resources, it would be beneficial to maintain multi-TRP operation in the target cell based on the previous TRP configuration used in the source cell (possibly with some configuration adaptation). More specifically, the pTRP configuration used in the source cell can be used as the sTRP configuration in the target cell after mobility, with some adaptations to the configuration possible due to the role change from pTRP to sTRP. Similarly, the sTRP configuration used in the source cell can be used as the pTRP configuration in the target cell after mobility, with some adaptations to the configuration possible due to the role change from sTRP to pTRP. That is, if the commonality attributes of the configuration between the source and the target are carefully used for such mobility events, the signaling involved in the mobility can be significantly reduced, and the interruptions caused by the mobility can also be reduced. However, the current mechanism does not take advantage of the commonality attributes.

[0167] Fig.11 An example of a potential serving cell configuration according to an embodiment of the present disclosure is shown. Fig.11 Among them, cell #1 and cell #2 are service cells.

[0168] In some implementations, some parts of the dedicated configuration of the serving cell configuration of cell #1 (dedicated configuration 1b) may be relevant to both cell #1 and cell #2, and some parts of the dedicated configuration of the serving cell configuration of cell #2 (dedicated configuration 2b) may be relevant to both cell #1 and cell #2. mTRP may be an example of a configuration in which i) when the UE is configured with cell #1 as its serving cell and thus provides pTRP resources based on dedicated configuration 1b, cell #2 provides sTRP resources based on dedicated configuration 1b; ii) when the UE is configured with cell #2 as its serving cell and thus provides pTRP information based on dedicated configuration 2b, cell #1 provides sTRP information based on dedicated configuration 2b. There is a high degree of commonality between dedicated configuration 1b and dedicated configuration 2b, but they are not exactly the same.

[0169] Therefore, in the present disclosure, a method for efficient configuration switching between a serving cell and a candidate / target cell based on a non-shared configuration part and a shared configuration part with selective configuration adjustment is proposed.

[0170] Fig.12 An example of a method performed by a UE according to an embodiment of the present disclosure is shown. The method may also be performed by a wireless device.

[0171] Reference Fig.12 In step S1201, the UE may receive a reference configuration for multiple cells and multiple modified configurations for multiple cells from a first cell. Each of the multiple modified configurations may be related to a corresponding cell.

[0172] In step S1203 , based on triggering mobility from the first cell to the second cell among the plurality of cells, the UE may identify a modified configuration related to the second cell.

[0173] In step S1205 , the UE may perform mobility from the first cell to the second cell based on the reference configuration and the modified configuration related to the second cell.

[0174] According to various embodiments, in order to perform mobility from a first cell to a second cell, the UE may construct a configuration for mobility to the second cell based on applying a modified configuration related to the second cell to a reference configuration. The UE may apply the constructed configuration.

[0175] According to various embodiments, the configuration for mobility to the second cell may include a configuration for a cell associated with the second cell. The UE may identify a reference configuration portion for the cell in a reconfiguration configuration for multiple cells. The UE may identify a modified configuration portion for the cell in a modified configuration associated with the second cell. The UE may construct a configuration for the cell based on applying the modified configuration portion of the cell to the reference configuration portion of the cell.

[0176] According to various embodiments, each of the multiple modification configurations related to the corresponding cell may include at least one of the following items: a first modification configuration part applied based on the corresponding cell being a serving cell; or a second modification configuration part applied based on the corresponding cell being a non-serving cell.

[0177] According to various embodiments, after performing mobility from the first cell to the second cell, the UE may store the reference configuration and the plurality of modified configurations in the configuration list without releasing the reference configuration and the plurality of modified configurations. The stored reference configuration and the plurality of modified configurations may be used for subsequent mobility from the second cell to the third cell.

[0178] According to various embodiments, the UE may determine to store each or all of the reference configuration and the plurality of modified configurations in the configuration list based on receiving an indication from the network. The plurality of modified configurations may include a modified configuration related to the first cell.

[0179] According to various embodiments, after performing mobility from the first cell to the second cell, the UE may trigger mobility from the second cell to a third cell among the plurality of cells. The UE may identify a modified configuration related to the third cell in the stored configuration list. The UE may perform mobility from the second cell to the third cell based on the reference configuration and the modified configuration related to the third cell.

[0180] According to various embodiments, the reference configuration may be a first reference configuration associated with the first group of cells. The UE may receive a second reference configuration associated with the second group of cells.

[0181] According to various embodiments, after performing mobility from the first cell to the second cell, the UE may trigger mobility from the second cell to the third cell. The UE may determine whether the third cell belongs to the first group of cells or the second group of cells. Based on the third cell belonging to the first group of cells, the UE may perform mobility from the second cell to the third cell based on the first reference configuration and the modified configuration related to the third cell. Based on the third cell belonging to the second group of cells, the UE may perform mobility from the second cell to the third cell based on the second reference configuration and the modified configuration related to the third cell.

[0182] According to various embodiments, mobility may include at least one of a primary cell (PCell) change, a primary secondary cell (PSCell) addition, a PSCell change, a secondary cell (SCell) change, or a transmission / reception point (TRP) change.

[0183] According to various embodiments, the UE may trigger mobility from the first cell to the second cell based on receiving a mobility indication from the network. The indication may be received via radio resource control (RRC) signaling, medium access control (MAC) control element (CE) signaling, or downlink control information (DCI) on a physical downlink control channel (PDCCH).

[0184] According to various embodiments, the UE may trigger mobility from the first cell to the second cell based on satisfying a mobility condition of the second cell. The mobility condition of the second cell may be included in a reference configuration or in a modified configuration related to the second cell, or in a configuration associated with the modified configuration related to the second cell, or in a current configuration other than the reference configuration.

[0185] According to various embodiments, the UE may be configured with multiple configuration parts. Each configuration part may be associated with one or more cells. Each configuration part may include one or more adaptation configurations. The UE may determine the applicable part of the configuration based on the configuration part and the current serving cell, and may have configuration adjustments based on the configuration.

[0186] Fig.13 An example of a signal flow between a UE and a network node according to an embodiment of the present disclosure is shown. The network node may include a base station (BS) and may be associated with a first cell.

[0187] Reference Fig.13 In step S1301, the network node may generate a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells. Each of the plurality of modified configurations may be associated with a corresponding cell.

[0188] In step S1303, the network node may send an RRC reconfiguration message including a reference configuration and a plurality of modified configurations to the UE.

[0189] In step S1305 , the network node may receive an RRC reconfiguration complete message as a response to the RRC reconfiguration message from the UE.

[0190] In step S1307 , based on triggering mobility from the first cell to the second cell among the plurality of cells, the UE may identify a modified configuration related to the second cell.

[0191] In step S1309 , the UE may perform mobility from the first cell to the second cell based on the reference configuration and the modified configuration related to the second cell.

[0192] Fig.14 An example of a method for configuration adaptation associated with a mobility procedure according to an embodiment of the present disclosure is shown. The method may be performed by a UE and / or a wireless device.

[0193] Reference Fig.14 In step S1401, the UE may obtain multiple configuration parts configured for the UE. For example, the UE may receive multiple configuration parts from the network. The configuration parts may be used to configure a reference configuration and / or a modified configuration.

[0194] Each configuration part may be associated with one or more cells. Each configuration part may be associated with one or more cell IDs (cell index or physical cell ID (PCI)).

[0195] At least one of the following configuration sections may be configured:

[0196] - if the associated cell is a serving cell, a non-shared common configuration part applicable only to the associated cell;

[0197] - if the associated cell is a non-serving cell, then the non-shared common configuration part applies only to the associated cell;

[0198] - if the associated cell is a serving cell, a non-shared dedicated configuration part applicable only to the associated cell;

[0199] - if the associated cell is a non-serving cell, then the non-shared dedicated configuration part applies only to the associated cell;

[0200] - A shared common configuration part applicable to multiple cells (applicable cells). The shared common configuration part may have multiple shared common configuration entries. For each applicable cell, a shared common configuration entry may be associated and thus applied. For each shared common configuration entry, an adjustment configuration may also be configured. Depending on whether the applicable cell is a serving cell or a non-serving cell, the adjustment configuration may be intended to adjust the corresponding shared common configuration entry. The adjustment configuration of the serving cell and the adjustment configuration of the non-serving cell may be configured for the corresponding shared common configuration entry.

[0201] - A shared dedicated configuration part applicable to multiple cells (applicable cells). The applicable cells of the relevant shared dedicated configuration part may be indicated implicitly or explicitly. The shared dedicated configuration part may have multiple shared dedicated configuration entries. For each applicable cell, a shared dedicated configuration entry may be associated and thus applied. For each shared dedicated configuration entry, an adjustment configuration may also be configured. Depending on whether the applicable cell is a serving cell or a non-serving cell, the adjustment configuration may be intended to adjust the corresponding shared dedicated configuration entry. The adjustment configuration of the serving cell and the adjustment configuration of the non-serving cell may be configured for the corresponding shared dedicated configuration entry.

[0202] The shared configuration section can be used to configure the reference configuration. The non-shared configuration section can be used to configure the modified configuration.

[0203] In step S1403, the UE may determine the applicable part of the configuration based on the configuration part and which cell is the serving cell, possibly with configuration adjustments. The UE may determine the applicable part when moving to a target cell.

[0204] For each non-shared common configuration part that is applicable if the associated cell is a serving cell:

[0205] - If the associated cell is a serving cell, the UE may consider the configuration part to be active (ie the relevant configuration part is selected), or equivalently, the UE may activate the configuration part.

[0206] - If the associated cell is not a serving cell, the UE may consider the configuration part to be inactive (ie the relevant configuration part is not selected), or equivalently, the UE may deactivate the configuration part.

[0207] For each non-shared dedicated configuration part that is applicable if the associated cell is a serving cell:

[0208] - If the associated cell is a serving cell, the UE may consider the configuration part to be active (ie the relevant configuration part is selected), or equivalently, the UE may activate the configuration part.

[0209] - If the associated cell is not a serving cell, the UE may consider the configuration part to be inactive (ie the relevant configuration part is not selected), or equivalently, the UE may deactivate the configuration part.

[0210] For each non-shared common configuration part that is applicable if the associated cell is a non-serving cell:

[0211] - If the associated cell is a non-serving cell, the UE may consider the configuration part to be active (ie the relevant configuration part is selected), or equivalently, the UE may activate the configuration part.

[0212] - If the associated cell is a serving cell, the UE may consider the configuration part to be inactive (ie the relevant configuration part is not selected), or equivalently, the UE may deactivate the configuration part.

[0213] For each non-shared dedicated configuration section that is applicable if the associated cell is not a serving cell:

[0214] - If the associated cell is not a serving cell, the UE may consider the configuration part to be active (ie the relevant configuration part is selected), or equivalently, the UE may activate the configuration part.

[0215] - If the associated cell is a serving cell, the UE may consider the configuration part to be inactive (ie the relevant configuration part is not selected), or equivalently, the UE may deactivate the configuration part.

[0216] For each shared common configuration part, the UE may select a shared common configuration entry applicable to the serving cell and other cells based on an association relationship between the shared common configuration entry and the applicable cell, possibly with configuration adjustments.

[0217] For each shared dedicated configuration part, the UE may select the shared dedicated configuration entries applicable to the serving cell and other cells based on the association relationship between the shared dedicated configuration entries and the applicable cells, possibly with adjustments.

[0218] In step S1405, the UE may apply the determined applicable part of the configuration. The UE may apply the determined applicable part when moving to the target cell.

[0219] The UE may be configured with an explicit indicator indicating whether the relevant configuration part may remain inactive (or may enter deactivation) without being released when the associated PCI becomes a non-serving cell, or whether the relevant configuration part should be released. The UE may be configured with an explicit indicator indicating whether the relevant configuration part may remain active at least in part in the case of a role change (via adaptation) when the associated PCI becomes a non-serving cell. The indicator may be configured when the network configures the UE with the configuration part or when providing a mobility command.

[0220] Fig.15 An example of configuration parameters of a cell according to an embodiment of the present disclosure is shown.

[0221] Reference Fig.15, the UE may be configured with configuration parameters for cell 1 and cell 2. The UE may be configured with a non-shared serving cell configuration part for cell 1 that is applicable only when cell 1 is a serving cell, and the UE may also be configured with a non-shared serving cell configuration part for cell 2 that is applicable only when cell 2 is a serving cell, and a shared dedicated configuration part that is applicable to both cell 1 and cell 2 (i.e., applicable when cell 1 is a serving cell, and also applicable when cell 2 is a serving cell).

[0222] The shared dedicated configuration part may include a shared dedicated configuration library 1 applicable to cell 1 and a shared dedicated configuration library 2 applicable to cell 2. The shared dedicated configuration part may include a shared dedicated configuration library applicable to cell 1 and cell 2. For the shared dedicated configuration part, an adjustment configuration part may also be configured. The adjustment configuration part may include an adjustment configuration for cell 1 and an adjustment configuration for cell 2.

[0223] The adjustment configuration for cell 1 may include adjustment_1s, which is used to adjust the shared dedicated configuration library 1 when cell 1 is a serving cell. The adjustment configuration for cell 1 may include adjustment_1n, which is used to adjust the shared dedicated configuration library 1 when cell 1 is a non-serving cell.

[0224] The adjustment configuration for cell 2 may include adjustment_2s, which is used to adjust the shared dedicated configuration library 2 when cell 2 is a serving cell. The adjustment configuration for cell 2 may include adjustment_2n, which is used to adjust the shared dedicated configuration library 2 when cell 2 is a non-serving cell.

[0225] For example, the reference configurations for cell #1 and cell #2 may include at least one of shared dedicated configuration library 1 or shared dedicated configuration library 2.

[0226] The modified configuration for cell #1 may include at least one of a modified configuration of a serving cell related to cell #1 and a modified configuration of a non-serving cell related to cell #1. The modified configuration for the serving cell related to cell #1 may include at least one of a common configuration part 1, a non-shared dedicated configuration 1, or an adjustment_1s. The modified configuration for the non-serving cell related to cell #1 may include an adjustment_1n.

[0227] The modified configuration for cell #2 may include at least one of a modified configuration of a serving cell related to cell #2 and a modified configuration of a non-serving cell related to cell #2. The modified configuration for the serving cell related to cell #2 may include at least one of a common configuration part 2, a non-shared dedicated configuration 2, or an adjustment_2s. The modified configuration for the non-serving cell related to cell #2 may include an adjustment_2n.

[0228] Fig.16An example of configuration parameters for a cell before a serving cell is changed according to an embodiment of the present disclosure is shown.

[0229] Reference Fig.16 , cell #1 may be configured as a serving cell for the UE, and cell #2 may be configured as a non-serving cell, for example, a candidate cell that may become a serving cell.

[0230] The UE may activate the non-shared serving cell configuration portion of cell 1. The UE may deactivate the non-shared serving cell configuration portion of cell 2.

[0231] The UE may activate the shared dedicated configuration part with adjustment, where the UE adjusts the shared dedicated configuration pool 1 based on adjustment_ls, and also adjusts the shared dedicated configuration pool 2 based on adjustment_2n. The UE may then apply the activated configuration part as the serving cell configuration.

[0232] Fig.17 An example of configuration parameters of a cell after a serving cell change according to an embodiment of the present disclosure is shown.

[0233] Reference Fig.17 , due to mobility or change of the serving cell, cell #2 may become the serving cell.

[0234] The UE may activate the non-shared serving cell configuration portion of cell 2. The UE may deactivate the non-shared serving cell configuration portion of cell 1.

[0235] The UE may activate the shared dedicated configuration part with adjustment, wherein the UE adjusts the shared dedicated configuration pool 1 based on adjustment_1n, and also adjusts the shared dedicated configuration pool 2 based on adjustment_2s. The UE may then apply the activated configuration part as the serving cell configuration.

[0236] In addition, in the present disclosure (for example, Fig.12 The method described from the perspective of the UE can be Figure 2 The first wireless device 100 and / or Figure 3 The UE 100 shown in FIG.

[0237] More specifically, the UE includes at least one transceiver, at least one processor, and at least one computer memory operatively connected to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor.

[0238] The operations include: receiving, from a first cell, a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein each of the plurality of modified configurations is associated with a corresponding cell; based on triggering mobility from the first cell to a second cell among the plurality of cells, identifying the modified configuration associated with the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and the modified configuration associated with the second cell.

[0239] In addition, in this disclosure (for example, Fig.12 The method described from the perspective of the UE can be stored in Figure 2 The first wireless device 100 is shown to be executed by software code 105 in the memory 104 included in the first wireless device 100.

[0240] More specifically, at least one computer readable medium (CRM) stores instructions that, based on being executed by at least one processor, perform operations including: receiving a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells from a first cell, wherein each of the plurality of modified configurations is associated with a corresponding cell; based on triggering mobility from the first cell to a second cell among the plurality of cells, identifying the modified configuration associated with the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and the modified configuration associated with the second cell.

[0241] In addition, in this disclosure (for example, Fig.12 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.

[0242] More specifically, a device 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 connected to the at least one processor. The at least one processor is configured / adapted to perform operations including: receiving a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells from a first cell, wherein each of the plurality of modified configurations is associated with a corresponding cell; based on triggering mobility from the first cell to a second cell among the plurality of cells, identifying a modified configuration associated with the second cell; and performing mobility from the first cell to the second cell based on the reference configuration and the modified configuration associated with the second cell.

[0243] In addition, in the present disclosure (for example, Fig.13 The method described from the perspective of a network node associated with the first cell can be Figure 2 The second wireless device 200 shown in FIG.

[0244] 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.

[0245] The operations include: generating a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein each of the plurality of modified configurations is associated with a corresponding cell; sending a radio resource control (RRC) reconfiguration message including the reference configuration and the plurality of modified configurations to a user equipment (UE); and receiving an RRC reconfiguration complete message as a response to the RRC reconfiguration message from the UE, wherein the UE is configured to: based on triggering mobility from a first cell to a second cell among the plurality of cells, identify the modified configuration associated with the second cell; and perform mobility from the first cell to the second cell based on the reference configuration and the modified configuration associated with the second cell.

[0246] The present disclosure may have various beneficial effects.

[0247] For example, the network may provide the UE with configurations for multiple candidate cells in a signaling efficient manner, not only for the upcoming mobility, but also for subsequent mobilities.

[0248] The beneficial effects that can be obtained by the specific embodiments of the present disclosure are not limited to the beneficial effects listed above. For example, there may be various technical effects that can be understood by a person skilled in the relevant art and / or derived from the present disclosure. Therefore, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that can be understood or derived from the technical features of the present disclosure.

[0249] The claims in this disclosure may be combined in various ways. For example, the technical features in the method claims of this disclosure may be combined to be implemented or performed in a device, and the technical features in the device claims may be combined to be implemented or performed in a method. In addition, the technical features in the method claims and the device claims may be combined to be implemented or performed in a device. In addition, the technical features in the method claims and the device claims may be combined to be implemented or performed in a method. Other implementations are within the scope of the appended claims.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a first cell, a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein each of the plurality of modified configurations is associated with a corresponding cell; identifying a modified configuration associated with a second cell among the plurality of cells based on triggering mobility from the first cell to the second cell; and The mobility from the first cell to the second cell is performed based on the reference configuration and the modified configuration related to the second cell.

2. The method according to claim 1, wherein: Performing the mobility from the first cell to the second cell includes: constructing a configuration for mobility to the second cell based on applying a modified configuration related to the second cell to the reference configuration; and Apply the constructed configuration.

3. The method according to claim 2, wherein: The configuration for mobility to the second cell comprises configuration for cells associated with the second cell, and Wherein, the method further comprises: identifying, in the reconfiguration configurations for the plurality of cells, a reference configuration portion for the cell; identifying, in the modified configuration associated with the second cell, a modified configuration portion for the cell; and The configuration for the cell is constructed based on applying the modified configuration portion for the cell to the reference configuration portion for the cell.

4. The method according to claim 1, wherein: Each of the plurality of modified configurations associated with the corresponding cell comprises at least one of the following: a first modified configuration part applied based on the corresponding cell being a serving cell; or A second modified configuration portion is applied based on the corresponding cell being a non-serving cell.

5. The method according to claim 1, after performing the mobility from the first cell to the second cell, the method further comprises: The reference configuration and the plurality of modified configurations are stored in a configuration list without releasing the reference configuration and the plurality of modified configurations.

6. The method according to claim 5, further comprising: determining to store each or all of the reference configuration and the plurality of modified configurations in the configuration list based on receiving an indication from the network, The multiple modification configurations include a modification configuration related to the first cell.

7. The method according to claim 5, after performing the mobility from the first cell to the second cell, the method further comprises: triggering mobility from the second cell to a third cell among the plurality of cells; identifying, in the stored configuration list, a modified configuration associated with the third cell; as well as The mobility from the second cell to the third cell is performed based on the reference configuration and the modified configuration related to the third cell.

8. The method according to claim 1, wherein: The reference configuration is a first reference configuration associated with a first group of cells, and The method further includes: receiving a second reference configuration related to a second group of cells.

9. The method according to claim 8, after performing the mobility from the first cell to the second cell, the method further comprises: triggering mobility from the second cell to a third cell; determining whether the third cell belongs to the first group of cells or the second group of cells; performing the mobility from the second cell to the third cell based on the first reference configuration and a modified configuration related to the third cell, based on the third cell belonging to the first group of cells; as well as Based on the third cell belonging to the second group of cells, the mobility from the second cell to the third cell is performed based on the second reference configuration and a modified configuration related to the third cell.

10. The method according to claim 1, wherein: The mobility includes at least one of a primary cell (PCell) change, a primary secondary cell (PSCell) addition, a PSCell change, a secondary cell (SCell) change, or a transmission / reception point (TRP) change.

11. The method according to claim 1, further comprising: triggering said mobility from said first cell to said second cell based on receiving a mobility indication from a network, The indication is received via radio resource control (RRC) signaling, medium access control (MAC) control element (CE) signaling, or downlink control information (DCI) on a physical downlink control channel (PDCCH).

12. The method according to claim 1, further comprising: triggering the mobility from the first cell to the second cell based on satisfying a mobility condition for the second cell, The mobility condition for the second cell is included in the reference configuration, or in the modified configuration related to the second cell, or in a configuration associated with the modified configuration related to the second cell, or in a current configuration other than the reference configuration.

13. The method according to any one of claims 1 to 12, wherein: The UE communicates with at least one of a mobile device, a network, or an autonomous vehicle.

14. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as At least one memory operatively coupled to the at least one processor and storing instructions that upon being executed by the at least one processor perform operations comprising: receiving, from a first cell, a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein each of the plurality of modified configurations is associated with a corresponding cell; identifying a modified configuration associated with a second cell among the plurality of cells based on triggering mobility from the first cell to the second cell; and The mobility from the first cell to the second cell is performed based on the reference configuration and the modified configuration related to the second cell.

15. The UE according to claim 14, wherein: The UE is arranged to implement the method according to any one of claims 2 to 13.

16. A network node associated with a first cell configured to operate in a wireless communication system, the network node comprising: at least one transceiver; at least one processor; as well as At least one memory operatively coupled to the at least one processor and storing instructions that upon being executed by the at least one processor perform operations comprising: generating a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein each of the plurality of modified configurations is associated with a corresponding cell; Sending a radio resource control message including the reference configuration and the plurality of modified configurations to a user equipment (UE) (RRC) reconfiguration message; and receiving, from the UE, an RRC reconfiguration complete message as a response to the RRC reconfiguration message, The UE is configured as follows: Based on triggering mobility from the first cell to a second cell among the plurality of cells, identifying Modified configuration related to the second cell; and Based on the reference configuration and the modified configuration associated with the second cell, performing The mobility to the second cell.

17. A method performed by a network node associated with a first cell configured to operate in a wireless communication system, the method comprising: generating a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein each of the plurality of modified configurations is associated with a corresponding cell; sending a radio resource control (RRC) reconfiguration message including the reference configuration and the plurality of modified configurations to a user equipment (UE); and receiving, from the UE, an RRC reconfiguration complete message as a response to the RRC reconfiguration message, The UE is configured as follows: identifying a modified configuration associated with a second cell among the plurality of cells based on triggering mobility from the first cell to the second cell; and The mobility from the first cell to the second cell is performed based on the reference configuration and the modified configuration related to the second cell.

18. The method according to claim 17, wherein: The UE is arranged to implement the method according to any one of claims 1 to 13.

19. A device adapted to operate in a wireless communication system, the device comprising: At least the processor; as well as At least one memory operatively coupled to the at least one processor and storing instructions that upon being executed by the at least one processor perform operations comprising: receiving, from a first cell, a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein each of the plurality of modified configurations is associated with a corresponding cell; identifying a modified configuration associated with a second cell among the plurality of cells based on triggering mobility from the first cell to the second cell; and The mobility from the first cell to the second cell is performed based on the reference configuration and the modified configuration related to the second cell.

20. A non-transitory computer readable medium (CRM) having stored thereon program code implementing instructions, the instructions, upon being executed by at least one processor, performing operations comprising: receiving, from a first cell, a reference configuration for a plurality of cells and a plurality of modified configurations for the plurality of cells, wherein: Each of the plurality of modified configurations is associated with a corresponding cell; identifying a modified configuration associated with a second cell among the plurality of cells based on triggering mobility from the first cell to the second cell; as well as The mobility from the first cell to the second cell is performed based on the reference configuration and the modified configuration related to the second cell.

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