Mobility improvement in wireless communication systems

Abstract

According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to improving mobility in wireless communications. [Background technology]

[0002] 3GPP (3rd Generation Partnership Project: registered trademark) LTE (Long-Term Evolution) is a technology that enables high-speed packet communications. Many methods have been proposed to achieve the LTE goals of reducing user and operator costs, improving service quality, expanding coverage, and increasing system capacity. 3GPP LTE's high-level requirements include reducing cost per bit, improving service availability, flexible use of frequency bands, simple architecture, open interfaces, and reasonable terminal power consumption.

[0003] The International Telecommunication Union (ITU) and 3GPP have begun work to develop requirements and specifications for the New Radio (NR) system. 3GPP must identify and develop the technical components necessary to successfully standardize NR in a timely manner that meets all immediate market needs and the longer-term requirements presented by the ITU-R (ITU Radio Communication Sector) IMT (International Mobile Telecommunications)-2020 process. NR must also be able to use any spectrum bands up to at least 100 GHz that are available for wireless communications well into the distant future.

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

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

[0006] According to an embodiment of the present disclosure, a method and apparatus for improving mobility in a wireless communication system is provided.

[0007] According to another embodiment of the present disclosure, a method and apparatus are provided for configuring cell configurations for mobility in a wireless communication system.

[0008] According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes (comprises; configures; establishes; configures; encompasses; contains; contains) a step of receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; a step of identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and a step of performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0009] 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 functionally coupled to the at least one processor and storing instructions for performing operations based on being executed by the at least one processor, the operations including: receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0010] 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 operatively coupled to the at least one processor and storing instructions for performing operations based on being executed by the at least one processor, the operations including: generating a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; transmitting a radio resource control (RRC) reconfiguration message to a user equipment (UE) including the reference setting and the plurality of modification settings; and receiving an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message; wherein the UE is configured to, based on triggering mobility from the first cell to a second cell of the multiple cells, identify a modification setting associated with the second cell, and perform mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0011] 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 the steps of generating a reference configuration for multiple cells and a plurality of modification configurations for the multiple cells, each of the plurality of modification configurations being associated with a corresponding cell; transmitting a radio resource control (RRC) reconfiguration message to a user equipment (UE) including the reference configuration and the plurality of modification configurations; and receiving an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message, wherein the UE is configured to, based on triggering mobility from the first cell to a second cell of the multiple cells, identify a modification configuration associated with the second cell, and perform mobility from the first cell to the second cell based on the reference configuration and the modification configuration associated with the second cell.

[0012] According to an embodiment of the present disclosure, an apparatus configured to operate in a wireless communication system includes at least one processor; and at least one memory functionally coupled to the at least one processor and storing instructions for performing operations based on being executed by the at least one processor, the operations including: receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0013] According to an embodiment of the present disclosure, in a non-transitory computer readable medium (CRM) storing program code embodying instructions for performing operations based on being executed by at least one processor, the operations include: receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0014] The present disclosure can have a variety of beneficial effects.

[0015] For example, the network may provide the UE with configurations for multiple candidate cells in a signal efficient manner for future mobility as well as subsequent mobility.

[0016] The beneficial effects that can be obtained through specific embodiments of the present disclosure are not limited to the beneficial effects exemplified above. For example, there are various technical effects that can be understood and / or derived from the present disclosure by a person of ordinary skill in the relevant technical field. Therefore, the beneficial 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 explanation of the drawings]

[0017] [Figure 1] 1 illustrates an example of a communication system in which implementations of the present disclosure may be applied. [Figure 2] 1 illustrates an example of a wireless device to which implementations of the present disclosure may be applied. [Figure 3] 1 illustrates an example of a UE to which an embodiment of the present disclosure may be applied. [Figure 4] 1 illustrates an example of a protocol stack in a 3GPP-based wireless communication system to which an embodiment of the present disclosure is applied. [Figure 5] 1 illustrates an example of a protocol stack in a 3GPP-based wireless communication system to which an embodiment of the present disclosure is applied. [Figure 6] 1 illustrates a frame structure in a 3GPP-based wireless communication system to which an embodiment of the present disclosure may be applied. [Figure 7] 1 illustrates an example of data flow in a 3GPP NR system to which embodiments of the present disclosure may be applied. [Figure 8] 1 illustrates an example of a legacy handover procedure to which the technical features of the present disclosure can be applied. [Figure 9] 1 illustrates an example of a conditional handover procedure to which the technical features of the present disclosure can be applied. [Figure 10] 1 illustrates an example of MTRP-based communication according to an embodiment of the present disclosure. [Figure 11] 10 illustrates examples of potential serving cell configurations according to an embodiment of the present disclosure. [Figure 12] 10 illustrates an example of a method performed by a UE according to an embodiment of the present disclosure. [Figure 13]1 illustrates an example of a signal flow between a UE and a network node according to an embodiment of the present disclosure. [Figure 14] 1 illustrates an example of a configuration adaptation method associated with a mobility procedure according to an embodiment of the present disclosure. [Figure 15] 10 illustrates an example of configuration parameters according to an embodiment of the present disclosure. [Figure 16] 10 illustrates an example of cell configuration parameters before a serving cell change according to an embodiment of the present disclosure. [Figure 17] 10 illustrates an example of cell configuration parameters after a serving cell change according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following techniques, devices, and systems may 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 multicarrier frequency division multiple access (MC-FDMA) systems. CDMA may be implemented over wireless technologies such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented over wireless technologies such as global system for mobile communications (GSM), general packet radio service (GPRS), or enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented over wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (3rd generation partnership project) LTE (long-term evolution) is part of evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE uses OFDMA on the downlink (DL) and SC-FDMA on the uplink (UL).LTE-A (advanced) is an evolved version of 3GPP LTE.

[0019] For convenience of explanation, the implementation of the present disclosure will be mainly described with reference to a 3GPP-based wireless communication system. However, the technical characteristics of the present disclosure are not limited thereto. For example, the following detailed description is provided based on a mobile communication system corresponding to a 3GPP-based wireless communication system, but aspects of the present disclosure, not limited to a 3GPP-based wireless communication system, can be applied to other mobile communication systems.

[0020] For terms and technologies used in this disclosure that are not specifically described, reference may be made to wireless communication standard documents published prior to this disclosure.

[0021] In the present disclosure, "A or B" can mean "only A," "only B," or "both A and B." In other words, in the present disclosure, "A or B" can be interpreted as "A and / or B." For example, in the present disclosure, "A, B or C" can mean "only A," "only B," "only C," or "any combination of A, B, and C."

[0022] As used in this disclosure, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0023] In the present disclosure, "at least one of A and B" can mean "only A," "only B," or "both A and B." Furthermore, in the present disclosure, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted in the same way as "at least one of A and B."

[0024] Additionally, in this disclosure, "at least one of A, B, and C" can mean "only A," "only B," "only C," or "any combination of A, B, and C." Additionally, "at least one of A, B, or C" or "at least one of A, B, and / or C" can mean "at least one of A, B, and C."

[0025] Furthermore, parentheses used in the present disclosure may mean "for example." Specifically, when displayed in "control information (PDCCH)," "PDCCH" may be proposed as an example of "control information." In other words, "control information" in the present disclosure is not limited to "PDCCH," and "PDCCH" may be proposed as an example of "control information." Furthermore, when displayed in "control information (i.e., PDCCH)," "PDCCH" may be proposed as an example of "control information."

[0026] Technical features described separately in one drawing in this disclosure can be implemented separately or simultaneously.

[0027] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed in this disclosure may be applied to various fields where device-to-device wireless communication and / or connectivity (e.g., 5G) is required.

[0028] The present disclosure will now be described in more detail with reference to the drawings, in which like reference numerals may refer to like or corresponding hardware, software, and / or functional blocks unless otherwise indicated.

[0029] FIG. 1 illustrates an example of a communication system in which implementations of the present disclosure may be applied.

[0030] The 5G usage scenario shown in FIG. 1 is merely an example, and the technical features of the present disclosure may be applied to other 5G usage scenarios not shown in FIG. 1.

[0031] The three main requirement categories for 5G are (1) enhanced mobile broadband (eMBB) category, (2) massive machine type communication (mMTC) category, and (3) ultra-reliable and low latency communications (URLLC) category.

[0032] 1, a communication system (1) includes wireless devices 100a to 100f, a base station (BS; 200), and a network 300. While FIG. 1 illustrates a 5G network as an example of the network of the communication system (1), implementation of the present disclosure is not limited to the 5G system and can be applied to future communication systems beyond the 5G system.

[0033] The base station 200 and network 300 may be implemented in a wireless device, and a particular wireless device may act as a base station / network node in relation to other wireless devices.

[0034] The wireless devices 100a to 100f are devices that communicate using a radio access technology (RAT) (e.g., 5G NR or LTE) and may also be referred to as communication / wireless / 5G devices. The wireless devices 100a to 100f may include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a mobile device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicles may include vehicles with wireless communication capabilities, autonomous vehicles, and vehicles capable of inter-vehicle communication. The vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices can include AR / VR / mixed reality (MR) devices and can be implemented in the form of head-mounted devices (HMDs) and head-up displays (HUDs) attached to vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital displays, vehicles, robots, etc. Mobile devices include smartphones, smart pads, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptops). Home appliances include TVs, refrigerators, and washing machines. IoT devices include sensors and smart meters.

[0035] In the present disclosure, the wireless devices 100a to 100f may be referred to as user equipment (UE). Examples of UE include mobile phones, smartphones, laptops, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, slate PCs, tablet PCs, ultrabooks, vehicles, autonomous vehicles, connected automobiles, UAVs, AI modules, robots, AR devices, VR devices, MR devices, hologram devices, public safety devices, MTC devices, IoT devices, medical devices, financial technology devices (or financial devices), security devices, weather / environment devices, 5G service-related devices, and fourth industrial revolution-related devices.

[0036] The wireless devices 100a to 100f can be connected to a network 300 via a base station 200. AI technology can be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f can be connected to an AI server 400 via the network 300. The network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, or a network beyond 5G. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly (e.g., sidelink communication) without going through the base station 200 / network 300. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (vehicle-to-vehicle) / V2X (vehicle-to-everything) communication). Furthermore, an IoT device (for example, a sensor) can directly communicate with another IoT device (for example, a sensor) or other wireless devices 100a to 100f.

[0037] Wireless communications / connections 150a, 150b, and 150c are established between the wireless devices 100a-100f and / or between the wireless devices 100a-100f and the base station 200 and / or between the base stations 200. Here, the wireless communications / connections are established via various RATs (e.g., 5G NR), such as uplink / downlink communications 150a, sidelink communications 150b (or device-to-device (D2D) communications), and inter-base station communications 150c (e.g., relaying, integrated access and backhaul (IAB)). Through the wireless communications / connections 150a, 150b, and 150c, the wireless devices 100a-100f and the base station 200 can transmit / receive wireless signals to / from each other. For example, the wireless communications / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. For this purpose, based on the various proposals of the present disclosure, at least some of the following processes are performed: various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes.

[0038] NR supports multiple numerologies (and / or multiple sub-carrier spacings (SCS)) to support various 5G services. For example, a 15 kHz SCS can support a wide area within the existing cellular band, while a 30 kHz / 60 kHz SCS can support dense urban areas, low latency, and wider carrier bandwidths. An SCS of 60 kHz or higher can support bandwidths of 24.25 GHz or higher to overcome phase noise.

[0039] The NR frequency band can be defined as two frequency ranges: FR1 (Frequency Range 1) and FR2 (Frequency Range 2). The values ​​of the frequency ranges can be changed. For example, the two frequency ranges (FR1, FR2) are shown in Table 1 below. For convenience of explanation, in the frequency ranges used in NR systems, FR1 can mean the "sub 6 GHz range," and FR2 can mean the "above 6 GHz range," and can be referred to as millimeter wave (mmW).

[0040] [Table 1]

[0041] As mentioned above, the numerical values ​​of the frequency range of the NR system may be changed. For example, FR1 may include a frequency band from 410 MHz to 7125 MHz as shown in Table 2 below. That is, FR1 may include a frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, such as vehicular communications (e.g., autonomous driving).

[0042] [Table 2]

[0043] Here, the wireless communication technology implemented in the wireless device of the present disclosure may include not only LTE, NR, and 6G, but also narrowband IoT (NB-IoT) for low-power communication. For example, NB-IoT technology is an example of low-power wide area network (LPWAN) technology and may be implemented using standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the aforementioned names. Additionally or alternatively, the wireless communication technology implemented in the wireless device of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology is an example of LPWAN technology and may be referred to by various names such as enhanced MTC (eMTC). For example, LTE-M technology may include at least one of ZigBee, Bluetooth, and / or LPWAN, and is not limited to the aforementioned names. For example, ZigBee technology may create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names. FIG. 2 illustrates an example of a wireless device to which an embodiment of the present disclosure may be applied.

[0044] 2, the first wireless device 100 and / or the second wireless device 200 may be embodied in various forms depending on a use case / service. For example, {the first wireless device 100 and the second wireless device 200} may correspond to at least one of {the wireless devices 100a to 100f and the base station 200}, {the wireless devices 100a to 100f and the wireless devices 100a to 100f}, and / or {the base station 200 and the base station 200} in FIG. 1. The first wireless device 100 and / or the second wireless device 200 may be configured with various components, devices / components, and / or modules.

[0045] First wireless device 100 may include at least one transceiver, such as transceiver 106 , at least one processing chip, such as processing chip 101 , and / or one or more antennas 108 .

[0046] Processing chip 101 may include at least one processor, such as processor 102, and at least one memory, such as memory 104. Additionally and / or alternatively, memory 104 may be located external to processing chip 101.

[0047] The processor 102 can control the memory 104 and / or the transceiver 106 and can be adapted to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts described in this disclosure. For example, the processor 102 can process information in the memory 104 to generate first information / signals, and then transmit a wireless signal including the first information / signals via the transceiver 106. The processor 102 can receive a wireless signal including second information / signals via the transceiver. The processor 102 stores information obtained by processing the second information / signals in the memory 104.

[0048] The memory 104 may be operatively coupled 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, when executed by the processor 102, embodies code, instructions, and / or sets of instructions that perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in this disclosure. For example, the firmware and / or software code 105 may embodi instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in this disclosure. For example, the firmware and / or software code 105 may control the processor 102 to implement one or more protocols. For example, the firmware and / or software code 105 may control the processor 102 to implement one or more layers of an air interface protocol.

[0049] Here, the processor 102 and memory 104 are part of a communications modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). A transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceivers 106 may be used interchangeably with RF (Radio Frequency) unit(s). In this disclosure, the first wireless device 100 may represent a communications modem / circuit / chip.

[0050] The second wireless device 200 may include at least one transceiver, such as transceiver 206 , at least one processing chip, such as processing chip 201 , and / or one or more antennas 208 .

[0051] Processing chip 201 may include at least one processor, such as processor 202, and at least one memory, such as memory 204. Additionally and / or alternatively, memory 204 may be located external to processing chip 201.

[0052] The processor 202 can control the memory 204 and / or the transceiver 206 and can be adapted to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts described in this disclosure. For example, the processor 202 can process information in the memory 204 to generate a third information / signal, and then transmit a wireless signal including the third information / signal via the transceiver 206. The processor 202 can receive a wireless signal including a fourth information / signal via the transceiver. The processor 202 stores the processed information of the fourth information / signal in the memory 204.

[0053] Memory 204 may be operatively coupled to processor 202. Memory 204 may store various types of information and / or instructions. Memory 204 may store firmware and / or software code 205 that, when executed by processor 202, embodies code, instructions, and / or sets of instructions that perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in this disclosure. For example, firmware and / or software code 205 may embodi instructions that, when executed by processor 202, perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in this disclosure. For example, firmware and / or software code 205 may control processor 202 to implement one or more protocols. For example, firmware and / or software code 205 may control processor 202 to implement one or more layers of an air interface protocol.

[0054] Here, the processor 202 and memory 204 may be part of a communications modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). A transceiver 206 is connected to the processor 202 and can transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In this disclosure, the second wireless device 200 may represent a communications modem / circuit / chip.

[0055] The hardware elements of the wireless devices 100, 200 will be described in more detail below. Without limitation, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, a media access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). The one or more processors 102, 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs), messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure. The one or more processors 102, 202 may generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure to the one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure.

[0056] The one or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, and / or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, and / or a combination thereof. As an example, the one or more processors 102, 202 may include 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), and / or one or more field programmable gate arrays (FPGAs). For example, the one or more processors 102, 202 may be comprised of a collection of a communication control processor, an application processor (AP), an electronic control unit (ECU), a central processing unit (CPU), a graphic processing unit (GPU), and a memory control processor.

[0057] One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various forms of data, signals, messages, information, programs, code, instructions, and / or instructions. The one or more memories 104, 204 may be configured as read-only memory (ROM), random access memory (RAM), erasable programmable ROM (EPROM), flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various technologies, such as wired or wireless connections.

[0058] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, wireless signals, etc., to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, wireless signals, etc., from one or more other devices.

[0059] One or more transceivers 106, 206 may be coupled to one or more antennas 108, 208. Additionally and / or alternatively, one or more transceivers 106, 206 may include one or more antennas 108, 208. The one or more transceivers 106, 206 may be configured to transmit and receive user data, control information, wireless signals / channels, etc., referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure via one or more antennas 108, 208. In this disclosure, the one or more antennas 108, 208 may be multiple physical antennas or multiple logical antennas (e.g., antenna ports).

[0060] The one or more transceivers 106, 206 may convert received user data, control information, radio signals / channels, etc., from RF-band signals to baseband signals for processing by the one or more processors 102, 202. The one or more transceivers 106, 206 may convert user data, control information, radio signals / channels, etc., processed by the one or more processors 102, 202, from baseband signals to RF-band signals. To this end, the one or more transceivers 106, 206 may include (analog) oscillators and / or filters. For example, the one or more transceivers 106, 206 may up-convert OFDM baseband signals to OFDM signals via (analog) oscillators and / or filters under the control of the one or more processors 102, 202, and transmit the up-converted OFDM signals at a carrier frequency. The transceiver 106, 206 can receive an OFDM signal at a carrier frequency and down-convert the OFDM signal to an OFDM baseband signal via (analog) oscillators and / or filters under the control of one or more processors 102, 202.

[0061] 2, the wireless device 100, 200 may further include additional components. The additional components 140 may be configured in various ways depending on the type of the wireless device 100, 200. For example, the additional components 140 may include a power supply / battery, input / output devices (e.g., audio I / O ports, video I / O ports), a drive device, and a computing device. The additional components 140 may be coupled to one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0062] In an implementation of the present disclosure, a UE can operate as a transmitter in the uplink (UL) and as a receiver in the downlink (DL). In an implementation of the present disclosure, a base station can operate as a receiver in the UL and as a transmitter in the DL. For convenience of technical explanation, the following mainly assumes that the first radio device 100 operates as a UE and the second radio device 200 operates as a base station. For example, a processor 102 connected to, included in, or exposed to the first radio device 100 can be configured to perform UE operations according to an implementation of the present disclosure or to control the transceiver 106 to perform UE operations according to an implementation of the present disclosure. A processor 202 connected to, included in, or exposed to the second radio device 200 can be configured to perform base station operations according to an implementation of the present disclosure or to control the transceiver 206 to perform base station operations according to an implementation of the present disclosure.

[0063] In this disclosure, a base station may be referred to as a Node B, eNode B (eNB), or gNB.

[0064] FIG. 3 illustrates an example of a UE to which the present disclosure may be implemented.

[0065] Referring to FIG. 3, a UE 100 may correspond to the first wireless device 100 of FIG.

[0066] The 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 SIM (subscriber identification module) card 145, a speaker 146, and a microphone 147.

[0067] The processor 102 may be configured to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure. The processor 102 may be configured to control one or more other components of the UE 100 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure. A layer of an air interface protocol may be implemented in the processor 102. The processor 102 may include an ASIC, other chipset, logic circuit, and / or data processing device. The processor 102 may be an application processor. The processor 102 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). An example of the processor 102 is the SNAP DRAGON made by Qualcomm®. TM EXYNOS series processor, made by Samsung(R) TM Series processors, A-series processors made by Apple(R), HELIO made by MediaTek(R) TM ATOM series processors, made by Intel(R) TM series processors or corresponding next generation processors.

[0068] Memory 104 is operatively coupled to processor 102 and stores various information for operating processor 102. Memory 104 may include ROM, RAM, flash memory, memory cards, storage media, and / or other storage devices. When implemented in software, the techniques described herein may be implemented using modules (e.g., procedures, functions, etc.) that perform the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed in this disclosure. The modules may be stored in memory 104 and executed by processor 102. Memory 104 may be implemented within processor 102 or external to processor 102, in which case it may be communicatively coupled to processor 102 via various methods known in the art.

[0069] The transceiver 106 is operatively coupled to the processor 102 to transmit and / or receive wireless signals. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include baseband circuitry for processing radio frequency signals. The transceiver 106 controls one or more antennas 108 to transmit and / or receive wireless signals.

[0070] The power management module 141 manages the power supply for the processor 102 and / or the transceiver 106. The battery 142 provides power to the power management module 110.

[0071] Display 143 outputs the results processed by processor 102. Keypad 116 receives input for use in processor 102. Keypad 144 is displayed on display 143.

[0072] The SIM card 145 is an integrated circuit for securely storing an international mobile subscriber identity (IMSI) and associated keys, which are used to identify and authenticate subscribers to mobile devices such as cell phones and computers. Many SIM cards can also store contact information.

[0073] A speaker 146 outputs sound-related results processed by the processor 102. A microphone 147 receives sound-related input for use by the processor 102.

[0074] 4 and 5 show examples of protocol stacks in a 3GPP-based wireless communication system to which the present disclosure may be applied.

[0075] In particular, FIG. 4 shows an example of a user plane protocol stack for the air interface between a UE and a BS, and FIG. 5 shows an example of a control plane protocol stack for the air interface between a UE and a BS. The control plane refers to the path along which control messages used by the UE and the network to manage a call are transmitted. The user plane refers to the path along which data generated in the application layer, such as voice data or internet packet data, is transmitted. Referring to FIG. 4, the user plane protocol stack can be divided into layer 1 (i.e., the PHY layer) and layer 2. Referring to FIG. 5, the control plane protocol stack can be divided into layer 1 (i.e., the PHY layer), layer 2, layer 3 (e.g., the RRC layer), and the NAS (Non-Access Stratum) layer. Layers 1, 2, and 3 are referred to as the AS (Access Stratum).

[0076] In a 3GPP LTE system, Layer 2 is divided into MAC, RLC, and PDCP sublayers. In a 3GPP NR system, Layer 2 is divided into MAC, RLC, PDCP, and SDAP sublayers. The PHY layer provides transmission channels to the MAC sublayer, which provides logical channels to the RLC sublayer, which provides RLC channels to the PDCP sublayer, and which provides radio bearers to the SDAP sublayer. The SDAP sublayer provides Quality of Service (QoS) flows to the 5G core network.

[0077] In a 3GPP NR system, the main services and functions of the MAC sublayer include mapping between logical channels and transmission channels; multiplexing / demultiplexing MAC SDUs belonging to one or other logical channels to / from transport blocks (TBs) delivered to / from the physical layer on the transmission channel; scheduling information reporting; error correction via Hybrid Automatic Repeat Request (HARQ) (one HARQ object per cell in the case of Carrier Aggregation (CA)); priority handling between UEs for dynamic scheduling; priority handling between logical channels of one UE for logical channel prioritization; and padding. A single MAC object can support multiple numerologies, transmission timings, and cells. The mapping restrictions for logical channel prioritization control the numerologies, cells, and transmission timings that a logical channel can use.

[0078] The MAC provides various types of data transmission services. Various types of logical channels are defined to allow for different types of data transmission services. That is, each logical channel supports a specific type of information transmission. Each logical channel type is defined by the type of information transmitted. Logical channels are classified into two groups: control channels and traffic channels. Control channels are used only for transmitting control plane information, while traffic channels are used only for transmitting 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 Service (PWS) broadcasts. The Common Control Channel (CCCH) is a logical channel for transmitting control information between the UE and the network and is used for UEs that do not have an RRC connection with the network. The Dedicated Control Channel (DCCH) is a point-to-point bidirectional logical channel that transmits dedicated control information between the UE and the network and is used by UEs that have an RRC connection. The Dedicated Traffic Channel (DTCH) is a point-to-point logical channel dedicated to one UE for transmitting user information. DTCH exists in both uplink and downlink. In the downlink, the following connections exist between logical channels and transmission channels: BCCH is mapped to BCH (Broadcast Channel), BCCH is mapped to DL-SCH (Downlink Shared Channel), PCCH is mapped to PCH (Paging Channel), CCCH is mapped to DL-SCH, DCCH is mapped to DL-SCH, and DTCH is mapped to DL-SCH. In the uplink, the following connections exist between logical channels and transmission channels:The CCCH is mapped to an Uplink Shared Channel (UL-SCH), the DCCH is mapped to the UL-SCH, and the DTCH is mapped to the UL-SCH.

[0079] The RLC sublayer supports three transmission modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). RLC configuration is based on logical channels independent of numerology and / or transmitter. In 3GPP NR systems, the main services and functions of the RLC sublayer vary depending on the transmission mode and include: transmission of upper layer PDUs; sequence number assignment independent of PDCP (UM and AM); error correction via ARQ (AM only); RLC SDU segmentation (AM and UM) and re-segmentation (AM only); SDU reassembly (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; and protocol error detection (AM only).

[0080] In a 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); user data transmission; reordering and duplicate detection; in-order delivery; PDCP PDU routing (for split bearers); PDCP SDU retransmission; ciphering, decryption, and security protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; PDCP PDU duplication and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include sequence numbering; ciphering, decryption, and security protection; control plane data transmission; reordering and duplicate detection; in-order delivery; PDCP PDU duplication and duplicate discard indication to lower layers.

[0081] In 3GPP NR systems, the main services and functions of SDAP include mapping between QoS flows and data radio bearers; and indicating a QoS Flow ID (QFI) in all DL and UL packets. A single protocol object in SDAP is configured for each individual PDU session.

[0082] In a 3GPP NR system, the main services and functions of the RRC sublayer include: broadcasting system information related to the AS and NAS; paging initiated by the 5GC or NG-RAN; establishment, maintenance, and release of the RRC connection between the UE and the NG-RAN; security functions including key management; establishment, configuration, maintenance, and release of signaling radio bearers (SRBs) and data radio bearers (DRBs); mobility functions (including handover and context transfer, UE cell selection and reselection, and cell selection and reselection control, inter-RAT mobility); QoS management functions; UE side information notification and reporting control; radio link failure detection and recovery; and NAS message transmission from / to the UE to / from the NAS.

[0083] FIG. 6 illustrates a frame structure in a 3GPP-based wireless communication system to which the present disclosure is applied.

[0084] The frame structure shown in Figure 6 is purely exemplary, and the number of subframes, the number of slots, and / or the number of symbols within a frame can vary. In a 3GPP-based wireless communication system, the OFDM numerology (e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration) can be configured to be different among multiple cells for one UE. For example, if a UE is configured with different SCSs for the cell and for aggregated cells, the duration (in absolute time) of time resources (e.g., subframes, slots, or TTIs) containing the same number of symbols can be different among the aggregated cells. Herein, a symbol can include an OFDM symbol (or a CP-OFDM symbol), an SC-FDMA symbol (or a Discrete Fourier Transform - Spread-OFDM (DFT-s-OFDM) symbol).

[0085] Referring to Figure 6, downlink and uplink transmissions are organized into frames. Each frame has a duration of Tf = 10 ms. Each frame is divided into two half-frames, each of which has a duration of 5 ms. Each half-frame consists of five sub-frames, with a duration of 1 ms per sub-frame. Each sub-frame is divided into slots, and the number of slots within a sub-frame varies depending on the sub-carrier spacing. Each slot contains 14 or 12 OFDM symbols based on the cyclic prefix (CP). With normal CP, each slot contains 14 OFDM symbols, and with extended CP, each slot contains 12 OFDM symbols. The above numerology is based on an exponentially scalable sub-carrier spacing Δf = 2u * 15 kHz.

[0086] Table 3 shows the subcarrier spacing βf=2 u *Number of OFDM symbols per slot for normal CP according to 15 kHz, N slot symb , the number of slots per frame N frame,u slot , and the number of slots per subframe N subframe,uslot This shows:

[0087] [Table 3]

[0088] Table 4 shows the number of OFDM symbols per slot for extended CP, N, according to the subcarrier spacing βf = 2u * 15 kHz. slot symb , the number of slots per frame N frame,u slot , and the number of slots per subframe for the extended CP, N subframe,u slot This shows:

[0089] [Table 4]

[0090] A slot contains a number of symbols (e.g., 14 or 12 symbols) in the time domain. For each numerology (e.g., subcarrier spacing) and carrier, a resource grid of Nsize,ugrid,x*NRBsc subcarriers and Nsubframe,usymb OFDM symbols is defined, starting with a common resource block (CRB) Nstart,ugrid specified by higher layer signaling (e.g., Radio Resource Control (RRC) signaling), where Nsize,ugrid,x is the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for the downlink and UL for the uplink. NRBsc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, NRBsc is typically 12. There is one resource grid for a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL). The carrier bandwidth Nsize,ugrid for the subcarrier spacing configuration u is given by higher layer parameters (e.g., RRC parameters). Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l indicating the symbol position relative to a reference point in the time domain. In a 3GPP-based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain. As shown in Figure 6, when the SCS is doubled, the slot length and symbol length are halved. For example, when the SCS is 15 kHz, the slot length is 1 ms, which is the same as the subframe length. When the SCS is 30 kHz, the slot length is 0.5 ms (= 500 us), and the symbol length is half that when the SCS is 15 kHz. When the SCS is 60 kHz, the slot length is 0.25 ms (= 250 us), and the symbol length is half that when the SCS is 30 kHz.When the SCS is 120 kHz, the slot length is 0.125 ms (= 125 us) and the symbol length is half that when the SCS is 60 kHz. When the SCS is 240 kHz, the slot length is 0.0625 ms (= 62.5 us) and the symbol length is half that when the SCS is 120 kHz.

[0091] In a 3GPP NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For a subcarrier spacing configuration u, CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with 'point A', which acts as a common reference point for the resource block grid. In a 3GPP NR system, PRBs are defined within a bandwidth part (BWP) and are numbered from 0 to NsizeBWP,i-1, where i is the number of bandwidth parts. The relationship between a physical resource block nPRB and a common resource block nCRB ​​within a bandwidth part i is as follows: nPRB = nCRB ​​+ NsizeBWP,i, where NsizeBWP,i is the common resource block where the bandwidth part starts for CRB 0. The BWP includes a number of consecutive RBs. A carrier can include up to N (e.g., 5) BWPs. A UE can be configured with one or more BWPs on a given component carrier. Only one BWP configured for the UE can be activated at a time. The activated BWP defines the UE's operating bandwidth within the cell's operating bandwidth.

[0092] In the present invention, the term "cell" refers to a geographical region or radio resource in which one or more nodes provide a communication system. A "cell" in a geographical region can be understood as the coverage within which a service can be provided using a carrier, and a "cell" as a radio resource (e.g., time-frequency resource) is associated with a bandwidth (BW), which is the frequency range configured by the carrier. A "cell" associated with radio resources is defined by a combination of downlink and uplink resources, for example, a combination of a downlink (DL) component carrier (CC) and an uplink (UL) CC. The cell can be composed of only downlink resources or downlink and uplink resources. Since DL coverage, which is the range within which a node can transmit a valid signal, and UL coverage, which is the range within which the node can receive a valid signal from a UE, depend on the carrier transmitting the signal, the coverage of the node can be associated with the coverage of the "cell" of radio resources used by the node. Thereby, the term "cell" can sometimes be used to refer to the service coverage of a node, and in other cases to a radio resource, or in other cases to the range that a signal using said radio resource can reach with effective strength.

[0093] Carrier aggregation (CA) aggregates two or more CCs. A UE can simultaneously receive or transmit on one or multiple CCs depending on its capacity. CA is supported for both contiguous and non-contiguous CCs. When CA is configured, the UE has only one radio resource control (RRC) connection with the network. During RRC connection establishment / re-establishment / handover, one serving cell provides non-access stratum (NAS) mobility information, and during RRC connection establishment / re-establishment / handover, one serving cell provides security input. This cell is called the primary cell (PCell). The PCell is the cell operating on the primary frequency, and it is within the cell that the UE performs the initial connection establishment procedure or initiates the connection re-establishment procedure. Depending on the UE's capacity, a secondary cell (SCell) can be configured to form a serving cell set together with the PCell. An SCell is a cell that provides additional radio resources at the top edge of a particular cell. Therefore, the set of serving cells configured for a UE always consists of one PCell and one or more SCells. For dual connectivity (DC) operation, the term special cell (SPCell) refers to a PCell in a master cell group (MCG) or a PSCell in a secondary cell group (SCG). An SPCell supports PUCCH transmission and contention-based voluntary access and is always activated. An MCG is a group of serving cells associated with a master node and consists of an SPCell (PCell) and optionally one or more SCells. An SCG is a subset of serving cells associated with a secondary node and consists of a PSCell and zero or more SCells for a UE configured with dual connectivity (DC). For a UE in RRC_CONNECTED that is not configured with CA / DC, there is only one serving cell including the PCell. For a UE in RRC_CONNECTED that is configured with CA / DC, the term "serving cell" is used to refer to the set of cells including the SPCell and all SCells.In DC, two MAC objects are configured in one UE, one for the MCG and one for the SCG.

[0094] FIG. 7 illustrates an example of data flow in a 3GPP NR system.

[0095] In Figure 7, "RB" indicates a radio bearer, and "H" indicates a header. Radio bearers are classified into two groups: Data Radio Bearers (DRBs) for user plane data and Signaling Radio Bearers (SRBs) for control plane data. MAC PDUs are transmitted / received to / from external devices through the PHY layer using radio resources. Such MAC PDUs arrive at the PHY layer in the form of transport blocks.

[0096] At the PHY layer, the uplink transport channels UL-SCH and RACH are mapped to their own physical channels PUSCH and PRACH, respectively, and the downlink transport channels DL-SCH, BCH, and PCH are mapped to PDSCH, PBCH, and PDSCH, respectively. At the PHY layer, uplink control information (UCI) is mapped to PUCCH, and downlink control information (DCI) is mapped to PDCCH. The MAC PDU associated with the UL-SCH is transmitted by the UE via the PUSCH based on the UL grant, and the MAC PDU associated with the DL-SCH is transmitted by the BS via the PDSCH based on the DL assignment.

[0097] The following describes handover (HO)-related topics.

[0098] The handover may include a PCell change. Furthermore, in the present disclosure, techniques related to 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 a SN addition).

[0099] FIG. 8 illustrates an example of a legacy handover procedure to which the technical features of the present disclosure can be applied.

[0100] Referring to Figure 8, in step S801, a source RAN node may send a measurement control message to a UE. The source RAN node may configure a UE measurement procedure according to roaming and access restriction information and, for example, available multiple frequency band information via the measurement control message. The measurement control information provided by the source RAN node via the measurement control message may support the function of controlling the connection mobility of the UE. For example, the measurement control message may include measurement configuration and / or reporting configuration.

[0101] In step S803, the UE may send a measurement report message to the source RAN node. The measurement report message may include measurement results for neighboring cell(s) around the UE that can be detected by the UE. The UE may generate the measurement report message according to the measurement control and / or measurement control information of the measurement control message received in step S801.

[0102] 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 the HO decision and determine a target RAN node for HO from among neighboring cells around the UE based on measurement results for neighboring cells (e.g., cell quality, signal quality, signal magnitude, reference signal received power (RSRP), reference signal received quality (RSRQ), channel condition, channel quality, signal to interference plus noise ratio (SINR)).

[0103] In step S807, the source RAN node may send an HO Request message to the target RAN node determined in step S805. That is, the source RAN node may perform handover preparation together with the target RAN node. The HO Request message may include information required for preparing handover at the target RAN node.

[0104] In step S809, the target RAN node can perform admission control based on the information included in the HO Request message. The target RAN node can configure and reserve the required resources (e.g., C-RNTI and / or RACH preamble). The AS-configuration used by the target RAN node can be independent (i.e., a "configuration") or can be described as a delta compared to the AS-configuration used by the source RAN node (i.e., a "reconfiguration").

[0105] In step S811, the target RAN node may send an HO request acknowledgement (ACK) message to the source RAN node. The HO request ACK message may include information about resources reserved and prepared for handover. For example, the HO request ACK message may include a transparent container, which is an RRC message for performing handover and is sent to the UE. 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 possible other parameters, such as proximity parameters and SIBs. If a RACH-less handover is configured, the container may include a timing adjustment instruction and an additional pre-allocated uplink grant. The HO request ACK message may include RNL / TNL information for the transmission tunnel, if necessary. The source RAN node may start data transmission upon receiving the HO request ACK message or upon initiating transmission of a handover command in the downlink.

[0106] In step S813, the source RAN node may send a handover command to the UE. For example, the handover command may include or be a cell configuration (i.e., an RRCReconfiguration message including reconfigurationWithSync). The RRCReconfiguration message and / or reconfigurationWithSync for the target cell may include at least one of the target cell's physical cell ID, a UE identifier (i.e., C-RNTI), an HO validity timer (i.e., T304 timer), a target gNB security algorithm identifier for the selected security algorithm, a dedicated RACH resource set for non-contention voluntary access (i.e., a dedicated voluntary access preamble), a combination between RACH resources and SSB(s), a combination between RACH resources and UE-specific CSI-RS configuration(s), common RACH resources, or system information of the target cell. The source RAN node may perform the necessary integrity protection and message encryption.

[0107] In step S815, the UE may be switched to a new cell, i.e., a target RAN node. The UE may be detached from a previous cell, i.e., a source RAN node, and synchronized with a new cell, i.e., a target RAN node. The UE may perform a handover from the source RAN node to the target RAN node based on applying the cell configuration. For example, when receiving a handover command, the UE may start a T304 timer and perform a non-contention based approach toward the target RAN node based on a dedicated RACH resource set.

[0108] In step S817, if the random access procedure is successfully completed, the UE may stop the T304 timer and send a handover completion message (i.e., an RRCReconfigurationComplete message) to the target RAN node. The UE may send an RRCReconfigurationComplete message including a C-RNTI to confirm the handover to the target RAN node to indicate that the handover procedure for the UE is complete. The target RAN node may verify the C-RNTI sent in the RRCReconfigurationComplete message. The target RAN node may then start transmitting data to the UE. If the random access fails and the T304 timer is still running, the UE may reattempt random access toward the target RAN node. If the T304 timer expires, the UE may declare a handover failure (HOF) and perform an RRC reconfiguration procedure.

[0109] FIG. 9 illustrates an example of a conditional handover procedure to which the technical features of the present disclosure can be applied.

[0110] 9, in step S901, the source cell may send a measurement control message to the UE. The measurement control message may include measurement configurations including a measurement configuration list, where each measurement configuration in the list includes a measurement identity, a corresponding measurement object, and a corresponding reporting configuration.

[0111] In step S903, the UE may send a measurement report message to the source cell. The measurement report message may include measurement results for neighboring cells around the UE that can 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 obtained in step S901.

[0112] In step S905, the source cell may make a handover decision based on the measurement report. For example, the source cell may determine candidate target cells (e.g., target cell 1 and target cell 2) for handover from among neighboring cells around the UE based on measurement results (e.g., signal quality, reference signal received power (RSRP), reference signal received quality (RSRQ)) for the neighboring cells.

[0113] In step S907, the source cell may transmit a handover request message to the target cell 1 and target cell 2 determined in step S905. That is, the source cell may perform handover preparation together with the target cell 1 and target cell 2. The handover message may include information required when preparing handover on the target side (e.g., target cell 1 and target cell 2).

[0114] In step S909, each of target cell 1 and target cell 2 can perform admission / exit control based on the information included in the handover request message. The target cell can configure and reserve required resources (e.g., C-RNTI and / or RACH preamble). The AS-configuration used by the target cell can be specified independently (i.e., a "configuration") or can be specified as a delta compared to the AS-configuration used by the source cell (i.e., a "reconfiguration").

[0115] In step S911, target cell 1 and target cell 2 may send a handover request acknowledge (ACK) message to the source cell. The handover request ACK message may include a cell configuration (i.e., an RRC Reconfiguration message including ReconfigurationWithSync) including information reserved and prepared for handover. For example, the handover request ACK message may include a transparent container that is an RRC message (i.e., an RRC Reconfiguration message / cell configuration) to perform handover and is transmitted to the UE. The container / cell configuration / RRC Reconfiguration message may include at least one of the following: a physical cell ID of the target cell, a UE identifier (i.e., C-RNTI), an HO validity timer (i.e., T304 timer), a target gNB security algorithm identifier for the selected security algorithm, a dedicated RACH resource set for non-contention voluntary access (i.e., a dedicated voluntary access preamble), a combination between RACH resources and SSB(s), a combination between RACH resources and UE-specific CSI-RS configuration(s), a common RACH resource, or system information of the target cell. If RACH-less handover is configured, the container may include a timing adjustment instruction and an additional pre-allocated uplink grant. The handover request ACK message may also include RNL / TNL information for the transmission tunnel, if necessary. The source cell may start data transmission upon receiving the handover request ACK message or upon starting transmission of a handover command in the downlink.

[0116] In step S913, the source cell may send an RRCReconfiguration message including a conditional reconfiguration to the UE. The conditional reconfiguration may also be referred to as (or include) a conditional handover (CHO) configuration and / or a conditional handover command (i.e., a CHO command). The conditional reconfiguration may include a conditional reconfiguration / conditional handover command 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 applicable 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 at least one of the physical cell ID of the target cell, an identifier of the UE (i.e., C-RNTI), an HO validity timer (i.e., T304 timer), a target gNB security algorithm identifier for the selected security algorithm, a dedicated RACH resource set for non-contention voluntary access (i.e., a dedicated voluntary access preamble), a combination between RACH resources and SSB(s), a combination between RACH resources and UE-specific CSI-RS configuration(s), a common RACH resource, or system information of the target cell.

[0117] In step S915, the UE may perform handover condition evaluation for candidate target cells (i.e., target cell 1 and target cell 2) and select a target cell for handover from among the candidate target cells. For example, the UE may perform measurements on the candidate target cells and determine whether the candidate target cells can satisfy the handover conditions for the candidate target cells from among the candidate target cells based on the measurement results for the candidate target cells. Alternatively, the UE may determine whether the target cell / measurement results for the target cells satisfy the handover conditions for the target cells. If the UE identifies that target cell 1 satisfies the handover conditions for target cell 1, the UE may select target cell 1 as the target cell for handover.

[0118] In step S917, the UE may detach from the previous cell, i.e., the source cell, and synchronize with the new cell, i.e., the selected target cell. The UE may then apply the cell configuration to perform a handover from the source cell to the target cell. For example, upon receiving a handover command, the UE may start a T304 timer and perform a non-contention based approach toward the target cell based on the dedicated RACH resource set.

[0119] In step S919, after the random access procedure is successfully completed, 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 the C-RNTI to confirm the handover to the target cell to indicate that the handover for the UE is completed for handover approval. The target RAN node may verify the transmitted C-RNTI in the RRCReconfigurationComplete message. The target RAN node may then start transmitting data to the UE. If the random access fails and the T304 timer is still running, the UE may reattempt random access toward the target cell. If the T304 timer expires, the UE may declare a handover failure (HOF) and perform an RRC reconfiguration procedure.

[0120] FIG. 10 illustrates an example of MTRP-based communication according to an embodiment of the present disclosure.

[0121] 10, a UE 1030 is connected to a network via an MTRP including TRP1 1010 and TRP2 1020. Each TRP forms multiple beams and can communicate with the UE 1030 via one or more of the beams. For example, TRP1 1010 can communicate with the UE 1030 via beam 1040 of the multiple beams formed by TRP1 1010, and TRP2 1020 can communicate with the UE 1030 via beam 1050 of the multiple beams formed by TRP2 1020.

[0122] A beam can be formed by radiation from multiple antenna elements of an antenna array of a TRP. The antenna array and / or at least one antenna element can be associated with one or more antenna ports. An antenna port can be defined such that a channel on which a symbol of an antenna port is transmitted can be inferred from a channel on which other symbols of the same antenna port are transmitted. That is, an antenna port is a logical concept, and a channel transmitted on a specific antenna port can be transmitted using a reference signal assigned to the specific antenna port. This means that each antenna port has its own reference signal.

[0123] The beam can be represented by Quasi Co-Location (QCL) information and / or Transmission Configuration Indication (TCI) status.

[0124] In one example, the TRPs may be associated with the same physical cell identifier (ID) but may be located in different geographic locations.

[0125] As an example, TRPs can be differentiated based on control resource sets (CORESETs), i.e., different TRPs can be associated with different CORESETs / CORESET IDs.

[0126] In one example, TRPs can be differentiated based on TCI status, i.e., different TRPs can be associated with different TCI statuses.

[0127] As an example, TRPs can be distinguished based on QCL information, i.e., different TRPs may be associated with different QCL information.

[0128] For example, TRPs may be differentiated on a beam basis, i.e., different TRPs may be associated with different beams.

[0129] M-TRP (multiple TRP) transmission

[0130] In multiple transmit / receive point (TRP) operation, the serving cell can schedule the UE in two TRPs to provide better coverage, reliability, and / or data rates for the PDSCH, PDCCH, PUSCH, and PUCCH.

[0131] There are two different operation modes for scheduling multi-TRP PDSCH transmissions: single-DCI and multi-DCI. Uplink and downlink operation control for the two modes can be performed by the physical and MAC layers within the configuration provided by the RRC layer. In single-DCI mode, the UE is scheduled with the same DCI for two TRPs, while in multi-DCI mode, the UE is scheduled with independent DCI for each TRP.

[0132] The multi-TRP PDCCH has two different operation modes: PDCCH repetition and SFN-based PDCCH transmission. In these two modes, the UE can receive two PDCCH transmissions, one from each TRP, carrying the same DCI. In the PDCCH repetition mode, the UE can receive two PDCCH transmissions carrying the same DCI from two linked search spaces, each associated with a different CORESET. In the SFN-based PDCCH transmission mode, the UE can receive two PDCCH transmissions carrying the same DCI from a single search space / CORESET using different TCI states.

[0133] In the case of multiple TRP PUSCH repetition, the UE transmits the same PUSCH content toward two TRPs having corresponding beam directions associated with different spatial relationships according to the instruction of a single DCI or a semi-static configuration grant provided via RRC. In the case of multiple TRP PUCCH repetition, the UE transmits the same PUCCH content toward two TRPs having corresponding beam directions associated with different spatial relationships.

[0134] For inter-cell multiple TRP operation and multiple DCI PDSCH transmission, one or more TCI states may be associated with an SSB having a PCI different from the serving cell PCI. An activated TCI state may be associated with up to one PCI different from the serving cell PCI at a time.

[0135] The M-TRP transmission method, in which M TRPs transmit data to one UE (user equipment), is a method for increasing the transmission rate, thereby increasing the success rate of eMBB M-TRP transmission and / or reception and reducing waiting time.

[0136] In addition, in terms of downlink control information (DCI) transmission, the M-TRP (multiple TRP) transmission method can include i) M-DCI (multiple DCI)-based M-TRP transmission in which each TRP transmits different DCI, and / or ii) S-DCI (single DCI)-based M-TRP transmission in which one TRP transmits DCI. For example, in the case of S-DCI, all scheduling information for data transmitted by M TRPs must be transmitted via a single DCI, so it can be used in an ideal backhaul (BH) environment in which dynamic cooperation between two TRPs is possible.

[0137] In the mTRP environment, the phases and roles of multiple TRPs associated with a single cell are not identical.

[0138] For example, multiple TRPs can be classified into p-TRPs (primary-TRPs) that receive / monitor essential system information and transmit / receive primary control information, and auxiliary TRPs (s-TRPs) that boost or redundantly transmit the same data as the p-TRPs to enhance the diversity effect.

[0139] For example, in UL transmission power allocation, the p-TRP can allocate available power first, and the s-TRP can allocate only the remaining transmission power.

[0140] For example, a p-TRP is a TRP that uses a signal / channel associated with a physical cell ID obtained from a PSS / SSS, and an s-TRP is a TRP that uses a signal / channel associated with another PCI. Generally, a p-TRP is basically configured for one serving cell, and the s-TRP associated with this serving cell can be selectively configured. If the s-TRP uses serving cell resources, the s-TRP can be referred to as an intra-cell s-TRP. If the s-TRP uses non-serving cell resources, the s-TRP can be referred to as an inter-cell s-TRP.

[0141] For example, a TRP that primarily performs BFD / RLM to perform more precise beam management can be defined as a p-TRP, and a TRP that performs BFD / RLM that is more relaxed than the BFD / RLM performed by the p-TRP, or that is configured not to perform BFD / RLM operations, can be defined as an s-TRP.

[0142] For example, when operating a serving cell associated with multiple TRPs, the TRP used as the basis for DL / UL synchronization of the multiple TRPs can be defined as p-TRP, and the TRP that adjusts DL / UL synchronization by applying an offset based on the synchronization timing of the p-TRP can be defined as s-TRP.

[0143] Thus, if there is a difference between the operations performed by the p-TRP and the s-TRP, the difference between the p-TRP and the s-TRP may be due to data transmission / reception performance or link reliability. When the UE transmits various types of data and different types of data occur at different times, it is optimal for the UE to select the TRP to use for data transmission according to the type / characteristics of the data. For example, for data requiring relatively high reliability / low latency, the UE may use the 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 may use the s-TRP. Therefore, the UE can achieve an optimal trade-off between the efficiency of multiplexed TRP resources and the fulfillment of transmission performance.

[0144] On the other hand, if the network triggers mobility from the serving cell to another cell / target cell, the network must provide the UE with a target cell configuration (i.e., a cell configuration for the target cell) before initiating the mobility.

[0145] Depending on the mobility event, there is a high degree of commonality between the source cell configuration and the target cell configuration. For example, assume that a UE configured on a serving cell is configured with two TRPs, where the serving cell provides primary TRP (pTRP) resources and a neighboring cell provides secondary TRP (sTRP) resources to the UE with some cooperation with the serving cell. When mobility occurs between a cell providing pTRP resources and a cell providing sTRP resources, it is beneficial to maintain multi-TRP operation after the move. For example, the pTRP and sTRP become sTRP and pTRP, respectively, after the move. To maintain multi-TRP operation after the move, the network must provide TRP-related configurations in the move command. For TRP-related configurations, the network must generate TRP-related configurations for the target cell in the new serving cell and provide the generated configurations to the UE.

[0146] When a mobile station moves from a serving cell (hereinafter referred to as a source cell) that provides pTRP resources to a neighboring cell (hereinafter referred to as a target cell) that provides sTRP resources, it is beneficial to maintain multi-TRP operation in the target cell, with partial configuration adaptation, if possible, based on the previous TRP configuration used in the source cell. More specifically, the pTRP configuration used in the source cell can be used as the sTRP configuration in the target cell after the mobile station, with partial configuration adaptation, if possible, due to a 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 the mobile station, with partial configuration adaptation, if possible, due to a role change from sTRP to pTRP. In other words, if the shared nature of the configuration between the source and target cell is carefully utilized for such mobile events, mobility-related signaling and mobility-related interference can be significantly reduced. However, this mechanism does not utilize the shared nature.

[0147] 11 illustrates an example of a potential serving cell structure according to an embodiment of the present disclosure, in which Cell #1 and Cell #2 are serving cells.

[0148] Depending on the implementation, a portion of the dedicated configuration (dedicated config1b) of the serving cell configuration for cell #1 may be associated with both cell #1 and cell #2, and a portion of the dedicated configuration (dedicated config2b) of the serving cell configuration for cell #2 may be associated with both cell #1 and cell #2. mTRP is an example of such a configuration, where i) when a UE configures cell #1 as a serving cell that provides pTRP resources based on dedicated config1b, cell #2 provides sTRP based on dedicated config1b, and ii) when a UE configures cell #2 as a serving cell that provides pTRP resources based on dedicated config2b, cell #1 provides sTRP based on dedicated config2b. Dedicated config1b and dedicated config2b have a high level of commonality, but are not completely identical to each other.

[0149] Therefore, the present disclosure proposes an efficient configuration switching method between a serving cell and a candidate / target cell based on selected configuration adjustments and non-shared and shared configuration parts.

[0150] 12 illustrates an example of a method performed by a UE according to an embodiment of the present disclosure. This method may also be performed by a wireless device.

[0151] 12, in step S1201, the UE may receive from a first cell a reference configuration for multiple cells and a plurality of modification configurations for the multiple cells, each of which may be associated with a corresponding cell.

[0152] In step S1203, the UE may identify a modification configuration associated with the second cell based on triggering mobility from the first cell to the second cell of the multiple cells.

[0153] 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 associated with the second cell.

[0154] According to various embodiments, to perform mobility from a first cell to a second cell, the UE may configure a configuration for mobility in the second cell based on applying a modified configuration associated with the second cell to a reference configuration, and the UE may apply the configured configuration.

[0155] 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 reference 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 configure a configuration for the cell by applying the modified configuration portion for the cell to the reference configuration portion for the cell.

[0156] According to various embodiments, each of the plurality of modification settings associated with the corresponding cell may include at least one of: a first modification setting portion that is applied based on the corresponding cell being a serving cell; or a second modification setting portion that is applied based on the corresponding cell being a non-serving cell.

[0157] According to various embodiments, after performing mobility from a first cell to a second cell, the UE can store the reference setting and multiple modification settings in a setting list without removing the reference setting and multiple modification settings.

[0158] According to various embodiments, the UE may determine whether to store each or all of the reference configuration and the plurality of modified configurations in the configuration list based on receiving an instruction from the network, where the plurality of modified configurations may include a modified configuration associated with the first cell.

[0159] According to various embodiments, a UE may perform mobility from a first cell to a second cell, and then trigger mobility from the second cell to a third cell among multiple cells. The UE may identify a modified configuration associated with the third cell in a 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 associated with the third cell.

[0160] According to various embodiments, the reference configuration may be a first reference configuration associated with a first group of cells, and the UE may receive a second reference configuration associated with a second group of cells.

[0161] According to various embodiments, a UE may perform mobility from a first cell to a second cell and then trigger mobility from the second cell to a third cell. The UE may determine whether the third cell belongs to a first group of cells or a second group of cells. If the third cell belongs to the first group of cells, the UE may perform mobility from the second cell to the third cell based on a first criteria setting and a modification setting associated with the third cell. If the third cell belongs to a second group of cells, the UE may perform mobility from the second cell to the third cell based on a second criteria setting and a modification setting associated with the third cell.

[0162] According to various embodiments, the 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 transmit / receive point (TRP) change.

[0163] According to various embodiments, the UE may trigger mobility from a first cell to a second cell based on receiving a mobility indication from the network, which may be received via radio resource control (RRC) signaling, media access control (MAC) control element (CE) signaling, or downlink control information (DCI) on a physical downlink control channel (PDCCH).

[0164] According to various embodiments, the UE may trigger mobility from the first cell to the second cell based on a mobility condition for the second cell being satisfied. The mobility condition for the second cell may belong to a reference configuration, a modified configuration associated with the second cell, a configuration associated with the modified configuration associated with the second cell, or a current configuration outside the reference configuration.

[0165] According to various embodiments, a UE can be configured with multiple configuration portions. Each configuration portion can be associated with one or more cells. Each configuration portion can include one or more adaptive configurations. The UE can determine the applicable portion of the configuration based on the configuration portion and the current serving cell, along with possible configuration-based configuration adjustments.

[0166] 13 illustrates an example of a signal flow between a UE and a network node according to an embodiment of the present disclosure. The network node may include a base station (BS) and may be associated with a first cell.

[0167] 13, in step S1301, a network node may generate a reference configuration for multiple cells and multiple modification configurations for the multiple cells, where each of the multiple modification configurations may be associated with a corresponding cell.

[0168] In step S1303, the network node may send an RRC reconfiguration message to the UE, the RRC reconfiguration message including the reference configuration and multiple modification configurations.

[0169] In step S1305, the network node may receive an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message.

[0170] In step S1307, a modified configuration associated with the second cell can be identified based on triggering mobility from the first cell to the second cell of the multiple cells.

[0171] 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 associated with the second cell.

[0172] 14 illustrates an example of a configuration adaptation method associated with mobility procedures according to an embodiment of the present disclosure. The method can be performed by a UE and / or a wireless device.

[0173] 14, in step S1401, the UE may obtain a multiplexing configuration portion configured for the UE. For example, the UE may receive a multiplexing configuration portion from the network. The configuration portion may be used when configuring a reference configuration and / or a modified configuration.

[0174] Each configuration part may be associated with one or more cells. Each configuration part may be associated with one or more cell IDs (cell indexes or physical cell IDs (PCIs)).

[0175] At least one of the following configuration parts can be configured:

[0176] If the combined cell is the serving cell, the non-shared common configuration part is applicable only for the combined cell.

[0177] If the combined cell is a non-serving cell, a non-shared common configuration part that is only applicable for the combined cell.

[0178] A non-shared dedicated configuration part that is only applicable for the combined cell if the combined cell is the serving cell.

[0179] If the combined cell is a non-serving cell, a non-shared dedicated configuration part that is only applicable for the combined cell.

[0180] A shared-common configuration part applicable for multiple cells (applicable cells). The shared-common configuration part can have multiple shared-common configuration items. For each applicable cell, one shared-common configuration item is associated and therefore can be applied. An adjustment configuration can also be configured for each shared-common configuration item. The adjustment configuration can adjust the corresponding shared-common configuration item depending on whether the applicable cell is a serving cell or a non-serving cell. The adjustment configuration for the serving cell and the adjustment configuration for the non-serving cell can be configured by the corresponding shared-common configuration item.

[0181] A shared-dedicated configuration part applicable for multiple cells (applicable cells). The applicable cells of the related shared-dedicated configuration part can be implicitly indicated or explicitly indicated. The shared-dedicated configuration part can have multiple shared-dedicated configuration items. For each configurable cell, one shared-dedicated configuration item is associated and therefore can be applied. For each shared-dedicated configuration item, an adjustment configuration can also be configured. The adjustment configuration can attempt to adjust the corresponding shared-dedicated configuration item depending on whether the applicable cell is a serving cell or a non-serving cell. An adaptive configuration for the serving cell and an adaptive configuration for the non-serving cell can be configured for the corresponding shared-dedicated configuration item.

[0182] The shared settings portion can be used when setting the reference settings, and the non-shared settings portion can be used when setting the modified settings.

[0183] In step S1403, the UE can determine the applicable part of the configuration, possibly along with the configuration adjustment, based on the configuration part and which cell is the serving cell. The UE can determine the applicable part when moving to the target cell.

[0184] Each non-shared common configuration part is applicable if the associated cell is the serving cell.

[0185] If the associated cell is the serving cell, the UE determines that the configuration part is active (i.e., the associated configuration part is selected), or equivalently, the UE may activate the configuration part.

[0186] If the associated cell is not the serving cell, the UE determines that the configuration part is inactive (i.e., the associated configuration part is not selected), or equivalently, the UE can deactivate the configuration part.

[0187] Each non-shared dedicated configuration part is applicable if the associated cell is the serving cell.

[0188] If the associated cell is the serving cell, the UE determines that the configuration part is active (i.e., the associated configuration part is selected), or equivalently, the UE may activate the configuration part.

[0189] If the associated cell is not the serving cell, the UE determines that the configuration part is inactive (i.e., the associated configuration part is not selected), or equivalently, the UE can deactivate the configuration part.

[0190] If the associated cell is not the serving cell, each applicable non-shared common configuration part

[0191] If the associated cell is not the serving cell, the UE determines that the configuration part is active (i.e., the associated configuration part is selected), or equivalently, the UE may activate the configuration part.

[0192] If the associated cell is the serving cell, the UE determines that the configuration part is inactive (i.e., the associated configuration part is not selected), or equivalently, the UE can deactivate the configuration part.

[0193] If the associated cell is not the serving cell, each applicable non-shared dedicated configuration part

[0194] If the associated cell is not the serving cell, the UE determines that the configuration part is active (i.e., the associated configuration part is selected), or equivalently, the UE may activate the configuration part.

[0195] If the associated cell is the serving cell, the UE determines that the configuration part is inactive (i.e., the associated configuration part is not selected), or equivalently, the UE can deactivate the configuration part.

[0196] For each shared common configuration part, the UE can select a shared common configuration part applicable to the serving cell and other cells based on the association relationship between the shared common configuration items and the applicable cells, and can perform configuration adjustment.

[0197] For each shared dedicated configuration part, the UE can select and adjust applicable shared common configuration parts for the serving cell and other cells based on the shared dedicated configuration items and the association relationships between the applicable cells.

[0198] In step S1405, the UE may apply the determined applicable part of the configuration to the target cell when mobility occurs.

[0199] The UE can be configured with an explicit indicator that indicates whether the UE will remain inactive (or be deactivated and enter) when the associated PCI becomes a non-serving cell, or whether the associated configuration part should be released. The UE can be configured with an explicit indicator that indicates whether the UE will remain activated, at least in part due to a role change (via adaptation), when the associated PCI becomes a non-serving cell. The indicator can be set when the network configures the UE with the configuration part or provides a mobility command.

[0200] FIG. 15 illustrates example configuration parameters for a cell according to an embodiment of the present disclosure.

[0201] According to Figure 15, the UE is configured with configuration parameters for cell 1 and cell 2. The UE can be configured with a non-shared serving cell configuration portion for cell 1 that is applicable only when cell 1 is the serving cell, the UE can also be configured with a non-shared serving cell configuration portion for cell 2 that is applicable only when cell 2 is the serving cell, and a shared-only configuration portion that is applicable for cell 1 and cell 2 (i.e., applicable when cell 1 is the serving cell and cell 2 is the serving cell).

[0202] The shared-only setting portion may include a shared-only setting base 1 applicable for cell 1 and a shared-only setting base 2 applicable for cell 2. The shared-only setting portion may include shared-only setting bases for cell 1 and cell 2. An adjustment setting portion may also be configured for the shared-only setting portion. The adjustment setting portion may include adjustment settings for cell 1 and adjustment settings for cell 2.

[0203] The adjustment configuration for cell 1 may include adjustment_1s used when adjusting the shared-dedicated configuration base 1 when cell 1 is the serving cell. The adjustment configuration for cell 1 may include adjustment_1n used when adjusting the shared-dedicated configuration base 1 when cell 1 is a non-serving cell.

[0204] The adjustment configuration for cell 2 may include adjustment_2s used when adjusting the shared-dedicated configuration base 2 when cell 2 is the serving cell. The adjustment configuration for cell 2 may include adjustment_2n used when adjusting the shared-dedicated configuration base 2 when cell 2 is a non-serving cell.

[0205] For example, the reference settings for cell #1 and cell #2 may include at least one of shared dedicated setting base 1 or shared dedicated setting base 2.

[0206] The modified configuration for cell #1 may include at least one of a modified configuration for a serving cell associated with cell #1 and a modified configuration for a non-serving cell associated with cell #1. The modified configuration for a serving cell associated with cell #1 may include at least one of common configuration part 1, non-shared dedicated configuration 1, or adjustment_1s. The modified configuration for a non-serving cell associated with cell #1 may include adjustment_1n.

[0207] The modified configuration for cell #2 may include at least one of a modified configuration for a serving cell associated with cell #2 and a modified configuration for a non-serving cell associated with cell #2. The modified configuration for a serving cell associated with cell #2 may include at least one of common configuration part 2, non-shared dedicated configuration 2, or adjustment_2s. The modified configuration for a non-serving cell associated with cell #2 may include adjustment_2n.

[0208] FIG. 16 illustrates an example of cell configuration parameters before a serving cell change according to an embodiment of the present disclosure.

[0209] 16, cell #1 can be configured as a serving cell for a UE, and cell #2 can be configured as a non-serving cell, i.e., a candidate cell that can become the serving cell.

[0210] The UE may activate the non-shared serving cell configuration portion for cell 1. The UE may deactivate the non-shared serving cell configuration portion for cell 2.

[0211] The UE can activate the shared-dedicated configuration part together with the adjustment, and the UE adjusts the shared-dedicated configuration base 1 based on adjustment_1s and also adjusts the shared-dedicated configuration base 2 based on adjustment_2n, thereby allowing the UE to apply the activated configuration part to the serving cell configuration.

[0212] FIG. 17 illustrates an example of cell configuration parameters after a serving cell change according to an embodiment of the present disclosure.

[0213] According to FIG. 17, cell #2 can become the serving cell due to mobility or change of serving cell.

[0214] The UE may activate the non-shared serving cell configuration portion for cell 2. The UE may deactivate the non-shared serving cell configuration portion for cell 1.

[0215] The UE can activate the shared-only configuration part together with the adjustment, where the UE adjusts the shared-only configuration infrastructure 1 based on adjustment_1n and also adjusts the shared-only configuration infrastructure 2 based on adjustment_2s, so that the UE can apply the activated configuration part to the serving cell configuration.

[0216] Also, the UE-perspective methods described in this disclosure (eg, FIG. 12) may be performed by the first wireless device 100 shown in FIG. 2 and / or the UE 100 shown in FIG.

[0217] More specifically, the UE includes at least one transceiver, at least one processor, and at least one computer memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor.

[0218] The operations include: receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0219] Furthermore, the method from the UE perspective described in this disclosure (e.g., FIG. 12) can be performed by software code 105 stored in memory 104 included in the first wireless device 100 shown in FIG. 2.

[0220] More specifically, at least one computer readable medium (CRM) stores program code embodying instructions that, when executed by at least one processor, perform operations, including: receiving from a first cell a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings being associated with a corresponding cell; identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0221] Also, in the present disclosure, the method from the UE perspective (e.g., FIG. 12) can be performed under the control of a processor 102 included in the first radio device 100 shown in FIG. 2 and / or under the control of a processor 102 included in the UE 100 shown in FIG. 3.

[0222] More particularly, an apparatus configured / adapted to operate in a wireless communication system (e.g., a wireless device / UE) includes at least one processor and at least one computer memory operatively coupled to the at least one processor, wherein the at least one processor is configured / adapted to perform operations including: receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings associated with a corresponding cell; identifying a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0223] Also, in the present disclosure, the method (eg, FIG. 13) from the perspective of a network node associated with the first cell may be performed by the second radio device 200 shown in FIG.

[0224] More specifically, the network node includes at least one transceiver, at least one processor, and at least one computer memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor.

[0225] The operations include: generating a reference setting for multiple cells and a plurality of modification settings for the multiple cells, each of the plurality of modification settings associated with a corresponding cell; transmitting a radio resource control (RRC) reconfiguration message including the reference setting and the plurality of modification settings to a user equipment (UE); and receiving an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message, wherein the UE is configured to, based on triggering mobility from the first cell to a second cell of the multiple cells, identify a modification setting associated with the second cell, and perform mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

[0226] The present disclosure can have a variety of beneficial effects.

[0227] For example, the network can provide the UE with configuration for multiple candidate cells in a signal-efficient manner for future mobility as well as subsequent mobility.

[0228] The effects that can be obtained through the specific examples of the present disclosure are not limited to the effects listed above. For example, there may be various technical effects that a person having ordinary skill in the related art can understand or derive from the present disclosure. Therefore, the specific effects of the present disclosure are not limited to those explicitly described in the present disclosure, but may include various effects that can be understood or derive from the technical features of the present disclosure.

[0229] The claims herein may be combined in various ways. For example, technical features in method claims herein may be combined to be embodied or performed in an apparatus, and technical features in apparatus claims may be combined to be embodied or performed in a method. Also, technical features in method claims and apparatus claims may be combined to be embodied or performed in an apparatus. Also, technical features in method claims and apparatus claims may be combined to be embodied or performed in a method. Other implementations are within the scope of the following claims.

[0230] [Claims at the time of international application] [Claim 1] 1. A method performed by a user equipment (UE) in a wireless communication system, comprising: receiving, from a first cell, a reference setting for multiple cells and a plurality of correction settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; and performing the mobility from the first cell to the second cell based on the reference setting and the modified setting associated with the second cell. [Claim 2] The step of performing the mobility from the first cell to the second cell includes: configuring a configuration for mobility in the second cell based on applying a modified configuration associated with the second cell to the reference configuration; and The method of claim 1 , comprising: applying the configured settings. [Claim 3] The configuration for mobility to the second cell includes a configuration for a cell associated with the second cell; In the reference setting for the multiple cells, identifying a reference setting portion of the cell; identifying a modification setting portion for the cell in a modification setting associated with the second cell; and The method of claim 2 , further comprising: configuring settings for the cell based on applying a modified setting portion for the cell to a reference setting portion for the cell. [Claim 4] Each of the plurality of modification settings associated with the corresponding cell comprises: a first modification setting portion that is applied based on the corresponding cell being a serving cell; or a second modification setting portion that is applied based on the corresponding cell being a non-serving cell; [Claim 5] 2. The method of claim 1, further comprising: storing the reference setting and the plurality of modification settings in a setting list without removing the reference setting and the plurality of modification settings after performing mobility from the first cell to the second cell. [Claim 6] determining whether to store the reference setting and each or all of the plurality of modified settings in the setting list based on receiving an instruction from a network; The method of claim 5 , wherein the plurality of modification settings includes a modification setting associated with the first cell. [Claim 7] After performing mobility from the first cell to the second cell, triggering mobility from the second cell to a third cell of the multiple cells; identifying in the stored list of settings a modified setting associated with the third cell; and The method of claim 5 , further comprising: performing mobility from the second cell to the third cell based on the reference setting and the modification setting associated with the third cell. [Claim 8] the reference setting is a first reference setting associated with a first group of cells; The method of claim 1 , further comprising receiving a second reference setting associated with a second group of cells. [Claim 9] After performing mobility from the first cell to the second cell, triggering mobility from the second cell to the third cell; determining whether the third cell belongs to the first group of cells or the second group of cells; If the third cell belongs to the first group of cells, performing mobility from the second cell to the third cell based on the first criteria configuration and a modification configuration associated with the third cell; and The method of claim 8, further comprising: if the third cell belongs to the second group of cells, performing mobility from the second cell to the third cell based on the second criteria setting and a modification setting associated with the third cell. [Claim 10] The mobility is Primary cell (PCell) change, Addition of a primary secondary cell (PSCell), PSCell change, Secondary cell (SCell) change, or 10. The method of claim 1, further comprising at least one of: a transmit / receive point (TRP) change; [Claim 11] triggering mobility from the first cell to the second cell based on receiving a mobility indication from a network; The instructions are: Radio resource control (RRC) signaling, Media access control (MAC) control element (CE) signaling, or 10. The method of claim 1, wherein the downlink control information (DCI) is received via a physical downlink control channel (PDCCH). [Claim 12] triggering mobility from the first cell to the second cell based on a mobility condition for the second cell being satisfied; The mobility condition for the second cell is: The above-mentioned standard setting, or the modified settings associated with the second cell; or settings associated with the modified settings associated with the second cell; or The method of claim 1 , wherein the current setting is outside the reference setting. [Claim 13] The method of 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. [Claim 14] 1. A user equipment (UE) configured to operate in a wireless communication system, comprising: at least one transmitter / receiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor; The operation is receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modified setting associated with the second cell. [Claim 15] 15. The UE according to claim 14, wherein the UE is configured to implement the method according to any one of claims 2 to 13. [Claim 16] A network node associated with a first cell configured to operate in a wireless communication system, comprising: at least one transmitter / receiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor; The operation is generating a reference configuration for multiple cells and a plurality of modified configurations for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; transmitting a radio resource control (RRC) reconfiguration message to a user equipment (UE) including the reference configuration and the plurality of modified configurations; and receiving an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message; The network node is configured to: identify a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell among the multiple cells; and perform mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell. [Claim 17] 1. 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 multiple cells and a plurality of modified configurations for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; transmitting a radio resource control (RRC) reconfiguration message to a user equipment (UE) including the reference configuration and the plurality of modified configurations; and receiving an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message; The method, wherein the UE is configured to identify a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell among the multiple cells, and to perform mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell. [Claim 18] The method according to claim 17, wherein the UE is configured to implement the method according to any one of claims 1 to 13. [Claim 19] 1. An apparatus configured to operate in a wireless communication system, comprising: at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor; The operation is receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modified setting associated with the second cell. [Claim 20] A non-transitory computer readable medium (CRM), comprising: storing program code embodying instructions that perform operations upon being executed by at least one processor; The operation is receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modified setting associated with the second cell.

Claims

1. 1. A method performed by a user equipment (UE) in a wireless communication system, comprising: receiving, from a first cell, a reference setting for multiple cells and a plurality of modification settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; and performing the mobility from the first cell to the second cell based on the reference setting and the modified setting associated with the second cell.

2. The step of performing the mobility from the first cell to the second cell includes: configuring a configuration for mobility in the second cell based on applying a modified configuration associated with the second cell to the reference configuration; and The method of claim 1 , comprising: applying the configured settings.

3. The configuration for mobility to the second cell includes a configuration for a cell associated with the second cell, identifying a reference portion of the cell in the reference configuration for the multiple cells; identifying a modification setting portion for the cell in a modification setting associated with the second cell; and The method of claim 2 , further comprising: configuring settings for the cell based on applying a modified setting portion for the cell to a reference setting portion for the cell.

4. Each of the plurality of modification settings associated with the corresponding cell comprises: a first modification setting portion that is applied based on the corresponding cell being a serving cell; or a second modification setting portion that is applied based on the corresponding cell being a non-serving cell.

5. 2. The method of claim 1, further comprising: storing the reference setting and the plurality of modification settings in a setting list without removing the reference setting and the plurality of modification settings after performing mobility from the first cell to the second cell.

6. determining whether to store the reference setting and each or all of the plurality of modified settings in the setting list based on receiving an instruction from a network; The method of claim 5 , wherein the plurality of modification settings includes a modification setting associated with the first cell.

7. After performing mobility from the first cell to the second cell, triggering mobility from the second cell to a third cell of the multiple cells; identifying in the stored list of settings a modified setting associated with the third cell; and The method of claim 5 , further comprising: performing mobility from the second cell to the third cell based on the reference setting and the modification setting associated with the third cell.

8. the reference setting is a first reference setting associated with a first group of cells; The method of claim 1 , further comprising receiving a second criteria setting associated with a second group of cells.

9. After performing mobility from the first cell to the second cell, triggering mobility from the second cell to the third cell; determining whether the third cell belongs to the first group of cells or the second group of cells; If the third cell belongs to the first group of cells, performing mobility from the second cell to the third cell based on the first criteria setting and a modification setting associated with the third cell; and 9. The method of claim 8, further comprising: if the third cell belongs to the second group of cells, performing mobility from the second cell to the third cell based on the second criteria setting and a modification setting associated with the third cell.

10. The mobility is Primary cell (PCell) change, Adding a primary secondary cell (PSCell), PSCell change, Secondary cell (SCell) change, or 10. The method of claim 1, further comprising at least one of: a transmit / receive point (TRP) change;

11. triggering mobility from the first cell to the second cell based on receiving a mobility indication from a network; The instructions are: Radio resource control (RRC) signaling; media access control (MAC) control element (CE) signaling, or 10. The method of claim 1, wherein the downlink control information (DCI) is received in a physical downlink control channel (PDCCH).

12. triggering mobility from the first cell to the second cell based on a mobility condition for the second cell being satisfied; The mobility condition for the second cell is: The above-mentioned standard setting, or the modification settings associated with the second cell; or settings associated with the modified settings associated with the second cell; or The method of claim 1 , wherein the current setting is outside the reference setting.

13. The method of 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. 1. A user equipment (UE) configured to operate in a wireless communication system, comprising: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor; The operation is receiving, from a first cell, a reference setting for multiple cells and a plurality of correction settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; 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.

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

16. 1. A network node associated with a first cell configured to operate in a wireless communication system, comprising: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor; The operation is generating a reference configuration for multiple cells and a plurality of modified configurations for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; transmitting a radio resource control (RRC) reconfiguration message to a user equipment (UE) including the reference configuration and the plurality of modified configurations; and receiving an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message; A network node configured to: identify a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell among the multiple cells; and perform mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

17. 1. 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 multiple cells and a plurality of modified configurations for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; transmitting a radio resource control (RRC) reconfiguration message to a user equipment (UE) including the reference configuration and the plurality of modified configurations; and receiving an RRC reconfiguration complete message from the UE in response to the RRC reconfiguration message; The method, wherein the UE is configured to identify a modification setting associated with the second cell based on triggering mobility from the first cell to a second cell among the multiple cells, and to perform mobility from the first cell to the second cell based on the reference setting and the modification setting associated with the second cell.

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

19. 1. An apparatus configured to operate in a wireless communication system, comprising: at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that perform operations based on being executed by the at least one processor; The operation is receiving, from a first cell, a reference setting for multiple cells and a plurality of correction settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modified setting associated with the second cell.

20. A non-transitory computer readable medium (CRM) comprising: storing program code embodying instructions that perform operations upon being executed by at least one processor; The operation is receiving, from a first cell, a reference setting for multiple cells and a plurality of correction settings for the multiple cells; each of the plurality of modification settings is associated with a corresponding cell; Identifying a modified configuration associated with a second cell of the multiple cells based on triggering mobility from the first cell to the second cell of the multiple cells; and performing mobility from the first cell to the second cell based on the reference setting and the modified setting associated with the second cell.

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