Electronic device and method for performing measurement reporting in wireless communication system

Abstract

According to an embodiment of the present disclosure, a method performed by a user equipment in a wireless communication system may comprise: receiving information for measurement from a base station, the information for measurement comprising frequency information related to at least one cell related to measurement or frequency information and identifier information of the at least one cell; performing a measurement on an independent (SA) cell not including a cell matching a cell identified by the information of the at least one NSA cell among the at least one cell, based on the information for the measurement and a designated NSA cell list including the information of the at least one non-independent (NSA) cell; and transmitting the measurement report of the SA cell to the base station.

Description

Technical Field

[0001] This disclosure relates to electronic devices and methods for performing measurement reporting in wireless communication systems. Background Technology

[0002] Fifth-generation (5G) mobile communication technology defines wide frequency bands to enable high transmission rates and new services, and can be implemented not only in the "sub 6GHz" band (such as 3.5GHz) but also in ultra-high frequency bands known as millimeter waves ("above 6GHz") (such as 28GHz and 39GHz). Furthermore, sixth-generation (6G) mobile communication technology, considered to surpass 5G systems, is thought to be implemented in terahertz (THz) bands (e.g., from 95GHz to 3THz) to achieve transmission rates fifty times faster than 5G and ultra-low latency reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, standardization has been underway for the following items to support services for enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC) and to meet performance requirements: beamforming and massive multiple-input multiple-output (MIMO) for mitigating radio wave path loss and increasing radio wave transmission distance in the UHF band; parameter sets for efficient utilization of UHF resources and dynamic operation of time slot formats (e.g., operating multiple subcarrier spacings); initial access technologies for supporting multi-beam transmission and broadband; definition and operation of bandwidth portions (BWP); new channel coding methods (such as low-density parity-check (LDPC) codes for high-capacity data transmission and polar codes for highly reliable transmission of control information); L2 preprocessing; and network slicing for providing dedicated networks for specific services.

[0004] Currently, given the services that 5G mobile communication technology needs to support, discussions are underway regarding improvements and performance enhancements to the initial 5G mobile communication technology. Physical layer standardization already exists for various technologies, such as Vehicle-to-Everything (V2X) to assist autonomous vehicles in determining driving based on location and status information sent by vehicles and to enhance user convenience; New Radio Unlicensed (NR-U) aimed at system operation in compliance with various regulatory requirements in unlicensed frequency bands; NR User Equipment (UE) power saving; and Non-Terrestrial Networks (NTNs) for direct satellite communication with UEs to ensure coverage and location in areas where communication with terrestrial networks is unavailable.

[0005] In the field of wireless interface architecture / protocols, standardization has been ongoing for technologies such as Industrial Internet of Things (IIoT) to support new services through interoperability and convergence with other industries, Integrated Access and Backhaul (IAB) to provide nodes for network service area extension by supporting wireless backhaul and access links in an integrated manner, Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and Two-Step Random Access (two-step RACH for NR) to simplify the random access process. In the field of system architecture / services, standardization has also been ongoing for 5G baseline architectures (e.g., service-based architectures or service-based interfaces) to combine Network Functions Virtualization (NFV) and Software Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for UE location-based reception services.

[0006] If the aforementioned 5G mobile communication systems become commercialized, the number of connected devices will increase exponentially, necessitating enhanced functionality and performance of 5G mobile communication systems, as well as integrated operation of connected devices. To this end, the following new research is planned: Extended Reality (XR) for effectively supporting Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR); 5G performance improvements and reduced complexity through the utilization of Artificial Intelligence (AI) and Machine Learning (ML); AI service support; Metaverse service support; and drone communication.

[0007] Furthermore, the development of this 5G mobile communication system will serve not only as a foundation for developing: new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, full-dimensional MIMO (FD-MIMO), multi-antenna transmission technologies such as array antennas and massive MIMO, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technologies using orbital angular momentum, and reconfigurable smart surfaces (RIS), but also as a foundation for developing: full-duplex technologies to improve the frequency efficiency of 6G mobile communication technology and improve system networks, AI-based communication technologies to achieve system optimization by utilizing satellites and AI in the design phase and internalizing end-to-end AI support functions, and next-generation distributed computing technologies to achieve complex services beyond the limitations of UE processing capabilities by utilizing ultra-high-performance communication and computing resources. Summary of the Invention

[0008] Technical issues Embodiments of this disclosure provide user equipment (UE) that can remove non-standalone (NSA) cells from a list of measured cells.

[0009] Embodiments of this disclosure provide a UE capable of reporting measurement reports for standalone (SA) cells separately.

[0010] Solution to the problem According to an example embodiment of this disclosure, a method performed by a user equipment in a wireless communication system may include: receiving measurement information from a base station, the measurement information including frequency information related to at least one cell or frequency information and identifier information of at least one cell; performing measurement on independent (SA) cells, excluding cells that match cells identified by the information of at least one NSA cell, based on the measurement information and a specified NSA cell list including information of at least one non-independent (NSA) cell; and sending a measurement report of the SA cell to the base station.

[0011] According to an example embodiment of this disclosure, a user equipment (UE) of a wireless communication system includes: a transceiver; a processor; and a memory storing instructions that, when executed by the processor, cause the UE to: receive measurement information from a base station, the measurement information including frequency information related to at least one cell or frequency information and identifier information of at least one cell associated with the measurement; perform measurement on independent (SA) cells, excluding cells that match cells identified by the information of at least one NSA cell, based on the measurement information and a designated NSA cell list including information of at least one non-standalone (NSA) cell; and send a measurement report of the SA cell to the base station.

[0012] Beneficial effects of the present invention According to the example embodiment, the power consumption of the user equipment (UE) can be reduced.

[0013] According to the example implementation, an overloaded registration process between the UE and the network node can be avoided.

[0014] According to the example implementation, user experience / service interruption can be avoided by preventing handover failures between standalone (SA) cells and non-standalone (NSA) cells.

[0015] In addition, various effects can be obtained directly or indirectly from this disclosure. Attached Figure Description

[0016] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0017] Figure 1 This is a diagram illustrating example architectures of Long Term Evolution (LTE) systems according to various embodiments.

[0018] Figure 2 This is a diagram illustrating an example architecture of a next-generation mobile communication system according to various embodiments.

[0019] Figure 3 This is a signal flow diagram illustrating an example measurement reporting method for a user equipment (UE) according to various embodiments.

[0020] Figure 4 This is a signal flow diagram illustrating an example measurement reporting method for a UE according to various embodiments.

[0021] Figure 5 This is a flowchart illustrating example measurement reporting methods according to various embodiments.

[0022] Figure 6 This is a flowchart illustrating example methods for managing a non-standalone (NSA) cell database according to various embodiments.

[0023] Figure 7 and Figure 8 Includes diagrams and flowcharts illustrating example methods for managing an NSA cell database according to various embodiments.

[0024] Figure 9 This is a flowchart illustrating example cell search methods according to various embodiments.

[0025] Figure 10 This is a flowchart illustrating an example method for removing an NSA cell from a list of measured cells according to various embodiments.

[0026] Figure 11 and Figure 12 Includes flowcharts and signal flow diagrams illustrating example measurement and measurement reporting methods according to various embodiments.

[0027] Figure 13 This is a flowchart illustrating an example SA cell measurement and reporting method according to various embodiments.

[0028] Figure 14 This is a flowchart illustrating an example SA cell measurement and reporting method according to various embodiments.

[0029] Figure 15 This is a flowchart illustrating an example SA cell measurement and reporting method according to various embodiments.

[0030] Figure 16 This is a flowchart illustrating an example measurement reporting method for a UE according to various embodiments.

[0031] Figure 17 This is a block diagram illustrating example configurations of a base station according to various embodiments.

[0032] Figure 18 This is a block diagram illustrating example configurations of a UE according to various embodiments.

[0033] Regarding the description of the accompanying drawings, the same or similar reference numerals may be used for the same or similar parts. Detailed Implementation

[0034] In the following description, various exemplary embodiments of the present disclosure are illustrated with reference to the accompanying drawings. However, this is not intended to limit the present disclosure to the specific embodiments, and it should be understood that it includes various modifications, equivalents, and / or alternatives to the various exemplary embodiments of the present disclosure.

[0035] Figure 1 This is a diagram illustrating example architectures of Long Term Evolution (LTE) systems according to various embodiments.

[0036] refer to Figure 1 As shown in the figure, the radio access network of an LTE system may include evolved Node Bs (hereinafter referred to as eNBs, Node Bs, or base stations) 105, 110, 115, and 120, a Mobility Management Entity (MME) (e.g., including various circuits and / or executable program instructions) 125, and a Service Gateway (S-GW) 130. User equipment (hereinafter referred to as UEs or terminals) 135 may access external networks via eNBs 105 to 120 and S-GW 130.

[0037] exist Figure 1 In this context, eNBs 105 to 120 can correspond to existing Node Bs in a Universal Mobile Telecommunications System (UMTS) system. The eNB connects to the UE 135 via a radio channel and performs more complex functions than an existing Node B. The LTE system uses Internet Protocol (IP) services for each user service, including real-time services such as Voice over Internet Protocol (VoIP), via a shared channel, and therefore requires equipment for scheduling by collecting UE state information (such as buffer state, available transmit power state, and channel state), which can be managed by eNBs 105 to 120. One eNB can typically control multiple cells. The LTE system can use Orthogonal Frequency Division Multiplexing (OFDM) as the radio access technology in, for example, a 20MHz bandwidth, to achieve data rates of, for example, 100Mbps. Furthermore, an Adaptive Modulation and Coding (AMC) scheme is used to determine the modulation scheme and channel coding rate based on the UE's channel state. The S-GW 130 is the device that provides data bearers and can generate or remove data bearers under the control of the MME 125. The MME 125 is a device responsible for various control functions and mobility management functions of the UE, and can be connected to multiple base stations.

[0038] Figure 2 This is a diagram illustrating an example architecture of a next-generation mobile communication system according to various embodiments.

[0039] refer to Figure 2The radio access network of the next-generation mobile communication system includes a new radio node B (hereinafter referred to as NR NB) 210 and an NR core network (CN) or next-generation (NG) CN 205. NR UE or terminal 215 can access external networks via NR NB 210 and NR CN 205.

[0040] exist Figure 2 In this context, the NR NB 210 corresponds to the eNB in ​​existing LTE systems. The NR NB 210 connects to the NR UE 215 via radio channels and can provide better service than existing NodeBs. Next-generation mobile communication systems provide services to each user's traffic through shared channels, thus requiring equipment for scheduling by collecting UE state information (such as buffer state, available transmit power state, and channel state), which is managed by the NR NB 210. One NR NB 210 can typically control multiple cells. Compared to existing LTE, it can ensure more bandwidth than currently available for ultra-high-speed data transmission, and can use OFDM as the radio access technology to further incorporate beamforming technology. Furthermore, AMC schemes can be applied to determine the modulation scheme and channel coding rate based on the UE's channel state. The NR CN 205 performs functions such as mobility support, bearer configuration, and quality of service (QoS) configuration. The NR CN 205 is a device for managing various control functions and mobility management functions for the UE and connects to multiple base stations. Furthermore, the next-generation mobile communication system is interoperable with existing LTE systems, and the NR CN 205 can connect to the MME 225 via a network interface. The MME 225 connects to the eNB 230, which serves as an existing base station.

[0041] For ease of explanation, the following terms / abbreviations may be used in this disclosure.

[0042] UE: User Equipment SA: Independent NSA: Non-independent UE: User Equipment NR: New Radio SIB: System Information Block PCI: Physical Layer Cell Identifier ARFCN: Absolute Radio Frequency Channel Number PLMN: Public Land Mobile Network OTA: In the Air MIB: Master Information Block RSSI: Received Signal Strength Indicator RSRP: Reference Signal Received Power RSRQ: Reference Signal Reception Quality SINR: Signal-to-Interference-plus-Noise Ratio In 5G wireless communication system deployments, various 5G wireless system deployment options may exist within the same system / network. For example, network nodes that only support NSA and network nodes that support SA can coexist, and some network nodes can support both NSA and SA. For the coexistence of network nodes that support NSA and / or SA differently, especially if the UE is a UE that supports SA / operates in SA mode, a method is needed to address issues such as wasted time and power due to unnecessary measurements performed by the network or UE, and overloaded registration of UEs that support SA / operates in SA mode to NSA cells.

[0043] In this disclosure, 5G NSA may refer to, for example, using Figure 2 The 5G network architecture described in the document is not used alone, but rather in conjunction with... Figure 1 The LTE system described herein is used together, and can refer to, for example, a system that operates LTE and 5G as a single network. Unlike the NSA scheme that uses LTE's Evolved Packet System (EPC) as the CN, 5G SA processes both CN and radio data through the 5G core network (5GC), and can indicate where... Figure 2 The 5G architecture described herein is used in both the control plane and the data plane.

[0044] For example, according to an embodiment, if the UE capability supports SA mode operation and the UE configuration for performing the measurement includes information about the target frequency to be measured, the UE can search for the target frequency and measure all target cells, including both SA and NSA cells. If the UE measures an NSA cell and reports the measurement result, the network can hand over the UE to the NSA cell, where the UE capability supports SA mode operation, and therefore the UE handover to the NSA cell may result in handover failure and service interruption. Furthermore, the UE may suffer time waste and unexpected power waste due to performing unnecessary measurements on neighboring NSA cells.

[0045] According to an embodiment, in another scenario, a UE supporting SA / SA mode operation can register to an NSA cell, which may lead to an overloaded registration process for both the UE and the network. In the following, the UE may indicate a UE supporting SA / SA mode operation, unless specifically stated otherwise for ease of description.

[0046] This disclosure provides a measurement reporting method to address the aforementioned problems suffered by UEs and networks supporting SA mode. More specifically, the method described in this disclosure relates to a measurement reporting method for identifying 5G cell capabilities and ignoring measurements of unnecessary NSA cells by comparing the identified 5G cells with an NSA cell database that includes NSA cell information.

[0047] According to embodiments of this disclosure, UE power consumption can be reduced, overloaded registration process between UE and network nodes can be avoided, and user experience / service interruption can be avoided by preventing handover failures between SA cells and NSA cells.

[0048] Figure 3 This is a signal flow diagram illustrating an example measurement reporting method for a UE according to various embodiments.

[0049] refer to Figure 3 The measurement reporting method according to the embodiment can be executed between UE 301 and gNodeB 303.

[0050] According to an embodiment, UE 301 can operate in SA mode and camp on an SA cell in operation 311. As described above, unlike the NSA scheme which uses LTE EPC as CN, SA is handled by 5GC for both CN and radio data, and can indicate that the 5G architecture is used in both the control plane and data plane, and the SA cell can indicate the cell used in SA operation.

[0051] According to an embodiment, in operation 312, UE 301 can receive a Radio Resource Control (RRC) reconfiguration message rrcReconfiguration from gNodeB 303.

[0052] According to an embodiment, UE 301 can receive a measurement configuration including 5G frequency information in operation 313. In doing so, the measurement configuration received by UE 301 can be sent to the UE via an RRC reconfiguration message `rrcReconfiguration`. In this document, the 5G frequency can include the frequency range to be measured by the UE, and the UE can search for 5G frequencies to obtain at least one cell (including NSA cells and / or SA cells). In addition to the 5G frequency information, the measurement configuration can include measurement events related to the conditions for the UE to perform a measurement report, threshold information, time information for triggering the measurement report, reporting parameter information (RSRP, RSRQ, SINR, etc.), reporting interval information, etc. The information / parameters included in the measurement configuration can be related to measurement conditions and can be used by the UE to measure the signal quality of neighboring cells. If neighboring cells meet the measurement conditions, the UE can report the measurement results by sending a measurement report message to the network.

[0053] According to an embodiment, in operation 314, UE 301 may send an RRC reconfiguration complete message rrcReconfiguratonComplete to gNodeB 303.

[0054] According to an embodiment, in operation 315, UE 301 can search for 5G frequencies based on information about the 5G frequencies included in the measurement configuration. As a search result, the UE can obtain / identify 5G cells that use the same frequency and are identified / distinguished from each other via PCI. That is, UE 301 can obtain a measurement cell list including 5G cells that use the same frequency and are identified / distinguished from each other via PCI.

[0055] According to an embodiment, in operation 316, UE 301 may send a measurement report to gNodeB 303. In this document, the measurement report may include both SA cell and NSA cell measurements. That is, the measurement report may include both SA cell measurement results and NSA cell measurement results. Thereafter, both measurement reports and the measurement result report can be used to indicate the measurement reports in this disclosure.

[0056] Figure 4 This is a signal flow diagram illustrating an example measurement reporting method for a UE according to various embodiments. More specifically, Figure 4 This is a diagram illustrating an example method for a UE to perform measurement reports while operating in SA mode without performing unnecessary measurements on NSA cells.

[0057] refer to Figure 4 The measurement reporting method according to the embodiment can be executed between UE 401 and gNodeB 403.

[0058] According to an embodiment, UE 401 can operate in SA mode and camp on an SA cell in operation 411.

[0059] According to an embodiment, in operation 412, UE 401 can receive an RRC reconfiguration message rrcReconfiguration from gNodeB 403.

[0060] According to an embodiment, in operation 413, UE 401 can receive a measurement configuration including 5G frequency information. At this time, the measurement configuration received by UE 401 can be sent to the UE via an RRC reconfiguration message `rrcReconfiguration`. In this document, the 5G frequency can be a frequency range to be measured by the UE, and the UE can search for 5G frequencies to obtain at least one cell (including NSA cells and / or SA cells). In addition to the 5G frequency information, the measurement configuration can include measurement events related to the conditions for the UE to perform a measurement report, threshold information, time information for triggering the measurement report, reporting parameters (RSRP, RSRQ, SINR, etc.) information, reporting interval information, etc. The information / parameters included in the measurement configuration can be related to measurement conditions and can be used by the UE to measure the signal quality of neighboring cells. If neighboring cells meet the measurement conditions, the UE can report the measurement results by sending a measurement report message to the network.

[0061] According to an embodiment, in operation 414, UE 401 may send an RRC reconfiguration complete message rrcReconfiguratonComplete to gNodeB 403.

[0062] According to an embodiment, in operation 415, UE 401 can perform a cell search for 5G frequencies based on information about the 5G frequencies included in the measurement configuration. As a search result, the UE can obtain / identify 5G cells that use the same frequency and are identified / distinguished from each other via PCI. That is, UE 401 can obtain a measurement cell list including 5G cells that use the same frequency and are identified / distinguished from each other via PCI.

[0063] According to an embodiment, in operation 416, UE 401 can remove cells corresponding to NSA cells among the 5G cells included in the measurement cell list from the measurement cell list. In this case, UE 401 can identify the NSA-corresponding cell among the cells included in the obtained measurement cell list based on a pre-configured NSA cell database in the UE.

[0064] For example, the NSA cell database can be configured as shown in Table 1 below, and can include the frequency of the NSA cell and the corresponding frequency's PCI information.

[0065] [Table 1]

[0066] If the network (gNodeB / base station) configures frequency 100 for the UE to use for measurement, the UE can trigger a cell search and obtain a list of measurement cells including cells allocated PCI 11, 15, and 18. The UE can compare the obtained list of measurement cells with the NSA cell database and thus remove cells from the obtained list that match cells included in the NSA cell database. According to the NSA cell database in Table 1, since cells allocated PCI 11 correspond to NSA cells at frequency 100, the UE can remove cells allocated PCI 11 from the list of measurement cells to be obtained, and the list of measurement cells can include only the two cells allocated PCI 15 and PCI 18. In this example, the UE can maintain measurement and monitoring of cells allocated PCI 15 and PCI 18.

[0067] According to an embodiment, in operation 417, UE 401 may send a measurement report to gNodeB 403. In this document, the measurement report may only include the SA cell. That is, the measurement report may only include the measurement results of the SA cell.

[0068] Figure 5 This is a flowchart illustrating example measurement reporting methods according to various embodiments. More specifically, Figure 5 An example overall flow for performing the measurement reporting method described in this disclosure is shown.

[0069] According to an embodiment, if the method is initiated in operation 500, the NSA cell database can be generated and maintained by the UE operating in SA mode in operation 501. For example, the NSA cell database can be stored in the UE's local memory, or the NSA cell database can be stored and maintained at a server, and if the NSA cell database is needed, the UE can receive the NSA cell database stored and maintained at the server from the server. The NSA cell database stored and managed in the UE's local memory can be referred to as the local NSA database, and the NSA cell database stored and managed by the server can be referred to as the server NSA database.

[0070] According to an embodiment, in the local NSA cell database, NSA cells included in the NSA cell database can be updated based on the 5G capabilities of the serving cell and neighboring cells included in broadcast messages of the serving cell and neighboring cells. In this document, 5G capabilities can indicate whether the serving cell and neighboring cells are respectively for NSA, SA, or both. For example, the UE can receive broadcast messages from the serving cell and neighboring cells, identify whether the serving cell and neighboring cells are for NSA, SA, or both based on the 5G capabilities of the serving cell and neighboring cells included in the broadcast messages, and update the NSA cell database based on the identification result. The updated NSA cell database can be stored and managed at the UE. In doing so, the UE can receive broadcast messages if it is in RRC idle mode, performing cell selection, performing cell reselection, or performing PLMN search. Furthermore, the local NSA cell database can be initialized if UE conditions such as timer expiration, updated tracking area, and updated registration history are met.

[0071] According to an embodiment, in the server's NSA cell database, the NSA cell database managed by the server can be updated by different UEs located at multiple different locations. For example, different UEs at different locations can each transmit information about the NSA cells they have detected to the server, and the server can update the NSA cell database managed by the server based on the NSA cell information received from each of the different UEs at different locations. In this case, the way different UEs at different locations detect NSA cells can be the same as previously... Figure 4 The procedure described in operation 415 is the same or similar. If the UE wants to use the server's NSA cell database, the UE can download the server's NSA cell database from the server. That is, the UE can send a message requesting the server's NSA cell database to the server, and the UE can receive a message including the NSA cell database from the server. Since the NSA cell database received by the UE from the server includes information on NSA cells reported to the server by other UEs besides the UE itself, the UE can identify additional NSA cells in the 5G frequency or other 5G frequencies in addition to the NSA cells detected by the UE. If the UE moves to a different area (or a different tracking area), the UE may need to use the NSA cell database, where the UE can delete the NSA cell database of the old area and receive the NSA cell database related to the corresponding area from the server in the new area to which the UE has moved.

[0072] Return to reference Figure 5According to an embodiment, in operation 503, the UE may determine / identify whether it has received a measurement configuration including both 5G frequency and PCI from the gNodeB / base station / network. According to an embodiment, if it is determined that the measurement configuration received by the UE includes both 5G frequency and PCI, then in operation 504, the UE may determine whether there exists a cell among at least one 5G cell identified by PCI in the configured 5G frequency that matches a cell included in the NSA cell database. According to an embodiment, in operation 509, the UE may ignore measurement requests for cells among at least one 5G cell identified by PCI in the configured 5G frequency that match cells included in the NSA cell database, and the method may terminate in operation 511. According to an embodiment, in operation 510, the UE may perform measurements in response to measurement requests for cells among at least one 5G cell identified by physical cell ID in the configured 5G frequency that do not match cells included in the NSA cell database, and the method may terminate in operation 511.

[0073] According to an embodiment, if it is determined that the measurement configuration received by the UE does not include both 5G frequencies and PCI, the UE can determine in operation 505 whether the measurement configuration includes only 5G frequencies. According to an embodiment, if it is determined that the measurement configuration does not include only 5G frequencies, the UE can terminate the method in operation 511. In this document, a measurement configuration that does not include only 5G frequencies can indicate information that the measurement configuration does not include 5G frequencies or PCI, or that the measurement configuration includes only PCI.

[0074] According to an embodiment, if it is determined that the measurement configuration only includes 5G frequencies, then in operation 506, the UE may search the configured 5G frequencies to obtain a list of measurement cells including cells to be included in the configured 5G frequencies. According to an embodiment, the list of measurement cells obtained by the UE by searching the configured 5G frequencies may include at least one cell, and this at least one cell may include at least one NSA cell and / or at least one SA cell. According to an embodiment, the UE may compare the obtained list of measurement cells with an NSA cell database pre-configured in operation 501, and therefore, in operation 507, remove cells from the list that match the cells included in the list from the at least one cell included in the NSA cell database.

[0075] According to an embodiment, in operation 508, the UE can measure and monitor the remaining cells in a measurement cell list that has had cells matching those included in the NSA cell database removed. The UE can terminate this method in operation 511.

[0076] Figure 6This is a flowchart illustrating example methods for managing an NSA cell database according to various embodiments. Figure 6 Show Figure 5 Example operation 501. For example, Figure 6 This may involve a local NSA cell database management method for the UE that changes based on the UE's tracking area.

[0077] According to an embodiment, at the start of operation 601, if the UE is in RRC idle mode, performing cell selection, performing cell reselection, or performing PLMN search, the UE can obtain a broadcast message of a 5G candidate cell in operation 602. In this case, the broadcast message can be obtained through a broadcast channel during the cell search process and can include 5G capability information of the 5G candidate cell. The 5G capability of the 5G candidate cell can indicate whether the 5G candidate cell is a cell for NSA, a cell for SA, or a cell for both NSA and SA.

[0078] According to an embodiment, in operation 603, the UE can determine whether the 5G candidate cell associated with the broadcast message is a cell for NSA. According to an embodiment, as a result of the determination, if it is determined that the 5G candidate cell associated with the broadcast message obtained by the UE is a cell for NSA, the UE can add the 5G frequency and PCI of the 5G candidate cell to the local NSA cell database in operation 605, and perform the following in operation 608: Figure 5 Operation 503. According to an embodiment, as a result of determination, if it is determined that the 5G candidate cell associated with the broadcast message obtained by the UE is not a cell for NSA, the UE can determine in operation 606 whether the UE should register to a new tracking area. In this document, the new tracking area may refer to a tracking area different from the existing tracking area that changes due to the UE's mobility, rather than the UE's previous tracking area. According to an embodiment, as a result of determination, if it is determined that the UE has not registered in the new tracking area, the UE can perform operation 608. Figure 5 Operation 503. According to an embodiment, as a result of the determination, if it is determined that the UE has registered in a new tracking area, the UE can initialize / reset the local NSA cell database in operation 607, and perform the following in operation 608. Figure 5 Operation 503. In this document, the conditions used to initialize / reset the local NSA cell database may include UE location or registration history.

[0079] Table 2 below shows an example of a local NSA cell database. According to an embodiment, the local NSA cell database can be configured to include NR ARFCN and PCI information.

[0080] [Table 2]

[0081] Figure 7 and Figure 8 This includes diagrams and flowcharts illustrating example methods for managing an NSA cell database according to various embodiments. In particular, Figure 7 and Figure 8 Example implementations involving managing NSA databases on a server.

[0082] First refer to Figure 7 According to an embodiment, server 700 can communicate with UE1 701 located in the first area, UE2 702 located in the second area, and UE3 703 located in the third area to build a server NSA database. When UE1 701 located in the first area, UE2 702 located in the second area, and UE3 703 located in the third area register to a new tracking area, move to a new tracking area, or identify the 5G capability of a 5G cell, each of UE1 701 located in the first area, UE2 702 located in the second area, and UE3 703 located in the third area can perform a cell search on a frequency configured by the base station relative to its area, and send the NSA cell information obtained through the cell search to server 700. In this document, the NSA cell database transmitted to server 700 by each of UE1 701 in the first area, UE2 702 in the second area, and UE3 703 in the third area can be the local NSA cell database of each of UE1 701, UE2 702, and UE3 703. Server 700 can construct a server NSA cell database managed at server 700 based on the NSA cell information received from each of UE1 701 in the first area, UE2 702 in the second area, and UE3 703 in the third area. Table 3 below shows an example of a server NSA cell database.

[0083] [Table 3]

[0084] According to an embodiment, the server NSA cell database may include NSA cell NR ARFCN, PCI, and TAC information.

[0085] exist Figure 7 In this context, UE1 701 located in the first region, UE2 702 located in the second region, and UE3 703 located in the third region can each delete their current local NSA cell database and receive the new region's NSA database from server 700 upon moving to a new tracking region. For example, Tables 4 and 5 below show the local NSA databases generated by two different UEs, respectively. If Table 4 is located in... Figure 7 If the local NSA database of UE1 701 in the first region is used, then the TAC of the first region can be 00ab, and the NSA cells detected by UE1 701 relative to the first region at the configured frequency can be two NSA cells among the cells allocated NR ARFCN 2700 and PCI 001 and the cells allocated NR ARFCN 3600 and PCI 002. In this paper, the NSA cell database in Table 4 can be the local NSA cell database of UE1 701 and can be stored in UE1 701. Furthermore, if Table 4 is located in Figure 7 If the local NSA database of UE2 702 in the second region is available, then the TAC of the second region can be 00cd, and the NSA cell detected by UE2 702 relative to the second region at the configured frequency can be two NSA cells: one assigned to NR ARFCN 2700 and PCI 003, and the other assigned to NR ARFCN 3600 and PCI 004.

[0086] [Table 4]

[0087] [Table 5]

[0088] Server 700 can build and store the server NSA cell database, including all NSA cell databases as described in Tables 4 and 5 above. If UE1 701 moves from the first area (TAC=00ab) to the second area (TAC=00cd), UE1 701 can delete the local NSA cell database generated in the first area (TAC=00ab), receive the NSA cell database corresponding to the second area (TAC=00cd) from the server, and store the received NSA cell database as UE1 701's local NSA cell database.

[0089] refer to Figure 8 According to an embodiment, in operation 801, the UE can perform a cell search on a frequency configured from a base station at its current location and report information about the 5G NSA cells detected as a result of the cell search to the server. In doing so, the NSA cell information reported to the server can be stored in the UE and configured as a local NSA database.

[0090] According to an embodiment, in operation 802, the UE can move to a new location different from its current location. The new location can be a tracking area assigned a different TAC than the previous location. According to an embodiment, in operation 803, the UE can delete the local NSA cell database stored in operation 801. According to an embodiment, in operation 804, the UE can receive the NSA cell database corresponding to the new location from the server and store the received NSA cell database as the local NSA cell database for the new location. In this case, the NSA cell database received by the UE from the server at the new location can be information about NSA cells obtained by other UEs at the corresponding location through cell search before the UE moves to the new location. Furthermore, after moving to the new location, the UE can be reconfigured for the frequency used for measurements from the base station and detect NSA cells at the new location by performing a cell search on the reconfigured frequency. Next, the UE can send information about the NSA cells detected at the new location to the server, and the server can update its NSA cell database by reflecting the NSA cell information received from the UE.

[0091] Figure 9 This is a flowchart illustrating example cell search methods according to various embodiments. More specifically, Figure 9 This could involve example methods for performing cell search after the UE receives the 5G frequency measurement configuration.

[0092] According to an embodiment, Figure 9 The method can be found in operation 901. Figure 5 The operation begins in 501, and the UE can receive (i) 5G frequency information or (ii) a measurement configuration including 5G frequency information and PCI from the base station.

[0093] According to an embodiment, in operation 902, the UE can determine whether the received measurement configuration includes both 5G frequency information and PCI. According to an embodiment, as a result of the determination in operation 902, if it is determined that the received measurement configuration includes both 5G frequency information and PCI, and at least one 5G cell identified by PCI in the 5G frequency configured for the UE includes a cell matching a cell included in the NSA cell database, then in operation 904, the UE can ignore the measurement request for the cell among the at least one 5G cell identified by PCI in the configured 5G frequency that matches a cell included in the NSA cell database, and the method can be terminated in operation 907. Furthermore, according to an embodiment, as a result of the determination in operation 902, if it is determined that the received measurement configuration includes neither 5G frequency information nor PCI, then the UE can determine in operation 903 whether the measurement configuration includes only 5G frequencies. According to an embodiment, as a result of the determination in operation 903, if it is determined that the measurement configuration does not include a separate 5G frequency, then the UE can terminate the method in operation 511. In this document, a measurement configuration that does not include a separate 5G frequency can indicate that the measurement configuration does not include 5G frequency information or PCI, or that the measurement configuration only includes PCI.

[0094] According to an embodiment, as a result of the determination in operation 903, if it is determined that the measurement configuration only includes 5G frequencies, then in operation 905, the UE can search the configured 5G frequencies to obtain a list of measurement cells including cells to be included in the configured 5G frequencies, and the UE can obtain the cell measurement list and execute in operation 906. Figure 5 Operation 507.

[0095] Figure 10 This is a flowchart illustrating example methods for removing NSA cells from a list of measured cells according to various embodiments. More specifically, Figure 10 It is shown Figure 5 The diagrams for operations 506 and 507.

[0096] According to an embodiment, for each cell included in the measurement cell list obtained through cell search, the UE can determine whether that cell matches a cell included in the NSA cell database. Therefore, in Figure 10 In the method, in operation 1002, the UE can determine whether each cell included in the measurement cell list is identified as an NSA cell (e.g., whether the cell matches a cell included in the NSA cell database). According to an embodiment, as a result of the determination in operation 1002, if it is determined that each cell is identified as an NSA cell, the UE can perform operation 1005. Figure 5Operation 508. According to an embodiment, as a result of the determination in operation 1002, if it is determined that each cell is not identified as an NSA cell, then in operation 1003, the UE can determine, based on a pre-configured NSA cell database, whether the NSA cell not identified as being included in the measurement cell list is a cell that matches a cell included in the NSA cell database. According to an embodiment, as a result of the determination in operation 1003, if it is determined that a cell matches a cell included in the NSA cell database, then the UE can remove the cell determined to match a cell included in the NSA cell database from the measurement cell list in operation 1004. According to an embodiment, as a result of the determination in operation 1003, if it is determined that a cell does not match a cell included in the NSA cell database, then the UE can return to operation 1002 and determine whether each cell is identified as an NSA cell.

[0097] According to the embodiment, as an execution Figure 10 The result of this method is that the list of measured cells obtained by the UE through cell search can include only SA cells.

[0098] Figure 11 and Figure 12 Includes flowcharts and signal flow diagrams illustrating example measurement and measurement reporting methods according to various embodiments.

[0099] First refer to Figure 11 According to the embodiment, in operation 1101, Figure 11 The method can be found in Figure 5 It begins in operation 507, and in operation 1102, as execution Figure 10 As a result of this method, the UE can perform measurements and monitoring based on a measurement cell list that includes only SA cells. For example, by removing NSA cells from the measurement cell list, only SA cells remain in the measurement cell list, and the UE can perform measurements and monitoring only on the remaining SA cells.

[0100] refer to Figure 12 According to an embodiment, UE 1201 can perform operation 1211, and operation 1211 can be related to... Figure 11 This is the same as or similar to operation 1102. In operation 1212, the UE can send measurement and monitoring results to gNodeB 1203 based on a measurement cell list that includes only SA cells. Since the measurement results are only performed on the remaining SA cells in the measurement cell list, the measurement results reported by UE 1201 to gNodeB 1203 can include measurement results for individual SA cells.

[0101] According to an embodiment, gNodeB 1203 can switch UE 1201 to an appropriate SA cell based on measurement results reported from UE 1201.

[0102] Figure 13 This is a flowchart illustrating an example SA cell measurement and reporting method according to various embodiments. More specifically, Figure 13 This may involve SA cell measurement and reporting methods performed during cell reselection. Besides cell reselection from one 5G cell to another, Figure 13 The cell reselection process can also be applied to cell reselection from 4G cells to 5G cells or from 3G cells to 5G cells.

[0103] According to an embodiment, in operation 1301, the UE can build and maintain / manage an NSA cell database. For example, the NSA cell database can be stored in the UE's local memory, or it can be stored and maintained at a server. If an NSA cell database is needed, the UE can receive the NSA cell database stored and maintained at the server. The NSA cell database received from the server can be stored by the UE as its local cell database.

[0104] According to an embodiment, in operation 1302, the UE can register with a network node in RRC idle mode, and the UE can receive cell reselection information from its serving cell (serving base station), which includes 5G frequency information to be measured by the UE via SIB messages.

[0105] According to an embodiment, in order to obtain a list of 5G candidate cells for cell reselection, the UE can perform a frequency search on the 5G frequencies configured based on cell reselection information in operation 1303.

[0106] According to an embodiment, in operation 1304, the UE may compare a pre-configured (e.g., specified) NSA cell database with the obtained 5G candidate cell list, and remove from the 5G candidate cell list cells that match the cells included in the NSA cell database from at least one of the cells in the 5G candidate cell list.

[0107] According to an embodiment, in order to select a suitable cell for performing cell reselection, the UE may perform measurement and cell reselection evaluation on the remaining cells in the 5G candidate list that have had cells removed from it that match the cells included in the NSA cell database in operation 1305, and the process may be terminated in operation 1306.

[0108] Figure 14 This is a flowchart illustrating an example SA cell measurement and reporting method according to various embodiments. More specifically, Figure 14 This may involve SA cell measurement and reporting methods performed during the redirection process.

[0109] According to an embodiment, in operation 1401, the UE can build and maintain / manage an NSA cell database. For example, the NSA cell database can be stored in the UE's local memory, or it can be stored and maintained at a server, and if needed, the UE can receive the NSA cell database stored and maintained at the server. The NSA cell database received from the server can be stored by the UE as its local cell database.

[0110] According to an embodiment, in operation 1402, the UE can determine whether it has received a redirection message including 5G frequency information measured by the UE. According to an embodiment, as a result of the determination in operation 1402, if it is determined that no redirection message including 5G frequency information has been received, the UE can terminate in operation 1406. Figure 14 The method. According to an embodiment, as a result of the determination in operation 1402, if it is determined that a redirection message including 5G frequency information has been received, the UE can perform a frequency search on the 5G frequency configured based on the cell reselection information to obtain a list of 5G candidate cells for cell reselection in operation 1403.

[0111] According to an embodiment, in operation 1404, the UE may compare a pre-configured NSA cell database with the obtained 5G candidate cell list and remove from the 5G candidate cell list cells that match the cells included in the NSA cell database from at least one of the cells in the 5G candidate cell list.

[0112] According to an embodiment, in order to select a suitable cell for performing the redirection process, the UE may perform measurement and cell reselection evaluation on the remaining cells in the 5G candidate list that have had cells removed from it that match the cells included in the NSA cell database in operation 1405, and the process may be terminated in operation 1406.

[0113] Figure 15 This is a flowchart illustrating an example SA cell measurement and reporting method according to various embodiments. More specifically, Figure 15 This involves the SA cell measurement and reporting method performed immediately after the UE is powered on during cell selection. The cell selection immediately following the UE's power-on can be the UE's initial access situation.

[0114] According to an embodiment, in operation 1501, the UE can build and maintain / manage an NSA cell database. The NSA cell database generated and maintained by the UE can be an NSA cell database built and maintained / managed before the UE is powered off.

[0115] According to an embodiment, the UE can power on in operation 1502, search for a 5G PLMN, and acquire a cell in operation 1503.

[0116] According to an embodiment, the UE can compare the acquired cell with a pre-configured NSA cell database, and thus determine in operation 1504 whether the acquired cell is a cell that matches the cells included in the NSA cell database.

[0117] According to an embodiment, if, as a result of the determination in operation 1504, the acquired cell is a cell that matches a cell included in the NSA cell database, then the UE can ignore the acquired cell in operation 1505 and return to operation 1503.

[0118] According to an embodiment, if, as a result of the determination in operation 1504, the acquired cell is not a cell matching a cell included in the NSA cell database, the UE can determine in operation 1506 whether the acquired cell is a suitable cell for the UE to camp on. According to an embodiment, as a result of the determination in operation 1506, if it is determined that the acquired cell is not a suitable cell for the UE to camp on, the UE can return to operation 1503. According to an embodiment, as a result of the determination in operation 1506, if it is determined that the acquired cell is a suitable cell for the UE to camp on, the UE can identify the acquired cell as the target cell, camp on the target cell in operation 1507, and the method can terminate in operation 1508.

[0119] Figure 16 This is a flowchart illustrating example methods for executing a measurement report of a UE according to various embodiments.

[0120] According to an embodiment, the UE can receive information for measurement from the base station in operation 1610.

[0121] According to an embodiment, the measurement information may include frequency information associated with at least one cell related to the measurement, or frequency information and identifier information of at least one cell.

[0122] According to an embodiment, based on measurement information and a pre-configured list of NSA cells including information of at least one NSA cell, in operation 1620, the UE may perform measurements only on SA cells that do not include cells that match the cells identified by the information of at least one NSA cell.

[0123] According to an embodiment, in operation 1630, the UE can transmit an SA cell measurement report to the base station.

[0124] Figure 17This is a block diagram illustrating example configurations of a base station according to various embodiments.

[0125] refer to Figure 17 The base station disclosed herein may include a transceiver unit (e.g., including communication circuitry) 1710, a storage unit (e.g., including a memory) 1720, and a control unit (e.g., including processing and / or control circuitry) 1730. The transceiver unit 1710, storage unit 1720, and control unit 1730 of the base station can operate according to the communication method of the base station as described above. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than those described above.

[0126] Transceiver unit 1710 jointly indicates the receiving unit and the transmitting unit of the base station, and may include various communication circuits to transmit signals to and receive signals from the UE and / or other network entities. The signals transmitted and received to and from the UE and / or other network entities may include control information and data. For this purpose, transceiver unit 1710 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, an RF receiver for low-noise amplification and down-converting the frequency of the received signal, etc. However, this is merely an example embodiment of transceiver unit 1710, and the components of transceiver unit 1710 are not limited to RF transmitters and RF receivers. Furthermore, transceiver unit 1710 may include various configurations for transmitting and receiving signals. Additionally, transceiver unit 1710 can receive signals via wired or wireless channels, output signals to control unit 1730, and transmit signals output from control unit 1730 via wired or wireless channels.

[0127] Storage unit 1720 may include a memory and store programs and data required for the operation of the base station. Additionally, storage unit 1720 may store control information or data contained in signals received at the base station. Storage unit 1720 may include storage media such as read-only memory (ROM), random access memory (RAM), hard disk, optical disc (CD)-ROM, and digital versatile disc (DVD), or a combination of storage media.

[0128] Control unit 1730 can control a series of processes to enable the base station to operate according to the exemplary embodiments of the present disclosure described above. Control unit 1730 may include at least one or more processors. Processors according to embodiments of the present disclosure may include various processing circuitry and / or multiple processors. For example, as used herein (including the claims), the term "processor" may include various processing circuitry, including at least one processor, wherein one or more of the at least one processor may be individually and / or collectively configured in a distributed manner to perform the various functions described herein. As used herein, when "processor," "at least one processor," and "one or more processors" are described as being configured to perform a number of functions, these terms cover, for example, but not limited to, a situation where one processor performs some of the functions and another processor performs other functions, and a situation where a single processor can perform all of the functions. Additionally, at least one processor may include, for example, a combination of processors performing various of the stated / disclosed functions in a distributed manner. At least one processor may execute program instructions to implement or perform various functions.

[0129] Figure 18 This is a block diagram illustrating example configurations of a UE according to various embodiments.

[0130] refer to Figure 18 The UE disclosed herein may include a transceiver unit (e.g., including communication circuitry) 1810, a storage unit (e.g., including memory) 1818, and a control unit (e.g., including processing and / or control circuitry) 1830. The transceiver unit 1810, storage unit 1818, and control unit 1830 of the UE can operate according to the communication method of the UE described above. However, the components of the UE are not limited to the examples described above. For example, the UE may include more or fewer components than those described above. Furthermore, the transceiver unit 1810, storage unit 1818, and control unit 1830 may be implemented as a single chip.

[0131] Transceiver unit 1810 jointly indicates the receiving unit and the transmitting unit of the UE, and may include various communication circuits for transmitting signals to and receiving signals from base stations and / or other network entities. Signals transmitted to and received from base stations may include control information and data. For this purpose, transceiver unit 1810 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, an RF receiver for low-noise amplification and down-converting the frequency of the received signal, etc. However, this is merely an example embodiment of transceiver unit 1810, and the components of transceiver unit 1810 are not limited to RF transmitters and RF receivers. Furthermore, transceiver unit 1810 may include various configurations for transmitting and receiving signals. Additionally, transceiver unit 1810 can receive signals via a wireless channel, output signals to control unit 1830, and transmit signals output from control unit 1830 via a wireless channel.

[0132] In addition, the transceiver unit 1810 can receive communication signals and output them to the control unit, and can transmit signals output from the control unit to the network entity via a wired or wireless network.

[0133] Storage unit 1820 may include a memory and store programs and data required for the operation of the UE. Additionally, storage unit 1820 may store control information or data contained in signals received at the UE. Storage unit 1820 may include a storage medium, such as ROM, RAM, hard disk, CD-ROM, DVD, or a combination of storage media.

[0134] Control unit 1830 can control a series of processes to enable the UE to operate according to the embodiments of the present disclosure described above. Control unit 1830 may include at least one or more processors. For example, control unit 1830 may include a communication processor (CP) for controlling communications and a higher-level application processor (AP) for controlling applications. According to embodiments of the present disclosure, the CP and / or AP may include various processing circuitry and / or multiple processors. For example, as used herein (including the claims), the term "processor" may include various processing circuitry, including at least one processor, wherein one or more of the at least one processor may be individually and / or collectively configured in a distributed manner to perform the various functions described herein. As used herein, when "processor," "at least one processor," and "one or more processors" are described as being configured to perform a number of functions, these terms cover, for example, but not limited to, a case where one processor performs some of the functions and another processor performs other functions, and a case where a single processor can perform all of the functions. Additionally, at least one processor may include, for example, a combination of processors performing various of the stated / disclosed functions in a distributed manner. At least one processor may execute program instructions to implement or perform various functions.

[0135] It should be noted that the above figures, example diagrams of control / data signal transmission methods, example diagrams of operation processes, and configuration diagrams are not intended to limit the scope of the claims of this disclosure. For example, they should not be construed as all components, entities, or operations described in the various example embodiments of this disclosure being essential components for performing this disclosure, and can be implemented by including only some components without prejudice to the essence of this disclosure. Furthermore, the various example embodiments can be combined with each other as needed. For example, some methods described in this disclosure can be combined to operate network entities and UEs.

[0136] The operations of the base station or UE described above can be implemented by providing a memory device that stores the corresponding program code in a specific unit of the base station or UE. In other words, the control unit of the base station or UE can perform the above operations by having a processor or central processing unit (CPU) read and execute the program code stored in the memory device.

[0137] The various components or modules in the entities, base stations, or UEs described in this disclosure can be operated using hardware circuitry (e.g., complementary metal-oxide-semiconductor-based logic circuitry, firmware, and software) and / or hardware circuitry (such as combinations of hardware, firmware, and / or software embedded in a machine-readable medium). For example, various electrical structures and methods can be implemented using circuitry such as transistors, logic gates, and application-specific integrated circuits (ASICs).

[0138] For software, a non-transitory computer-readable storage medium may be provided to store one or more programs (software modules). One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors of an electronic device. One or more programs may include instructions for controlling the electronic device to perform methods according to various example embodiments of this disclosure.

[0139] Such programs (software modules, software) can be stored in random access memory, including non-volatile memory such as flash memory, ROM, electrically erasable programmable ROM (EEPROM), disk storage devices, CD-ROMs, DVDs or other optical storage devices, and magnetic tape. It can be stored in some or all of the memory that combines those recording media. Multiple memories may be included.

[0140] The program can be stored in an attachable storage device accessible via a communication network such as the Internet, intranet, local area network (LAN), wide area network (WLAN), or storage area network (SAN), or a combination of these networks. Such a storage device can access a device executing embodiments of this disclosure via an external port. Furthermore, a separate storage device on the communication network can access a device executing embodiments of this disclosure.

[0141] In various exemplary embodiments of this disclosure, the components included in this disclosure are represented in singular or plural form. However, for ease of explanation, the singular or plural expression may be appropriately chosen depending on the exemplary circumstances. This disclosure is not limited to a single component or multiple components; a component expressed in plural form may be configured as a single component, and a component expressed in singular form may be configured as multiple components.

[0142] While various exemplary embodiments of this disclosure have been specifically described, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure, including the appended claims and their equivalents. Therefore, the scope of this disclosure includes all modifications or substitutions derived from the scope and spirit of the claims and their equivalents. Furthermore, it should be understood that various embodiments may be combined if desired. For example, some methods explained in this disclosure may be combined with each other to operate the gNB and UE. Moreover, although exemplary embodiments of this disclosure are suggested based on 5G and NR systems, other modifications based on the technical ideas of the exemplary embodiments of this disclosure can be applied to other communication systems, such as LTE, LTE-A, and LTE-A-Pro systems.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: Information for measurement is received from a base station, the information for measurement including frequency information related to at least one cell associated with the measurement, or the frequency information and identifier information of the at least one cell; Based on the information used for measurement and a specified list of NSA cells including information from at least one non-independent NSA cell, the measurement is performed on independent SA cells that do not include any of the at least one cells that match the cells identified by the information from the at least one NSA cell; and Send the measurement report of the SA cell to the base station.

2. The method according to claim 1, wherein, The NSA cell list includes at least one of a local NSA cell list managed by the user equipment or a server NSA cell list managed by the server and sent to the user equipment.

3. The method according to claim 2, further comprising: The base station receives a message, the message including candidate cell information related to the measurement and information on whether the candidate cell supports at least one of NSA or SA. Wherein, based on the fact that the candidate cell is an NSA cell, the frequency associated with the candidate cell and the identifier of the candidate cell are added to the local NSA cell list.

4. The method according to claim 3, further comprising: Based on the fact that the candidate cell is an SA cell, identify whether the user equipment has registered to a TA that is different from the tracking area TA registered before receiving the message; as well as Based on the user equipment's registration with the different TA, the local NSA cell list is reset.

5. The method according to claim 2, further comprising: Send information about NSA cells detected based on a first location of the user equipment to the server to update the server's NSA cell list, wherein the first location is identified based on a first tracking area code (TAC). as well as Receive the server NSA cell list associated with the first TAC from the server.

6. The method according to claim 5, further comprising: Based on the user equipment moving to a second location different from the first location. Remove the server NSA cell list associated with the first TAC; as well as Receive from the server a list of NSA cells associated with the second TAC used to identify the second location.

7. The method according to claim 1, further comprising: Based on the identification that the information used for measurement includes the frequency information and the identifier information of the at least one cell, measurement requests for cells in the at least one cell that match the cells identified by the information of the at least one NSA cell are ignored; as well as Based on the identification that the information used for measurement includes only the frequency information related to the at least one cell, the frequency is searched to obtain a list of measurement cells for the measurement. The list of measured cells includes at least one of the cells.

8. The method according to claim 7, further comprising: Identify the cell in the at least one cell included in the measurement cell list that matches the cell identified through the information of the at least one NSA cell; Remove identified cells from the list of measured cells that match the cells identified through the information of the at least one NSA cell; as well as The measurement is performed on the SA cells included in the measurement cell list, from which cells that match the cells identified by the information of the at least one NSA cell have been removed.

9. The method according to claim 1, wherein, The identifier information of the at least one cell includes the Physical Layer Cell Identifier (PCI).

10. The method according to claim 1, wherein, The measurement report for the SA cell includes at least one of the following: reference signal received power (RSRP), reference signal received quality (RSRQ), or signal-to-interference-plus-noise ratio (SINR) measured in the SA cell.

11. A user equipment (UE) for a wireless communication system, the user equipment comprising: transceiver; processor; as well as The memory stores instructions that, when executed by the processor, cause the UE to: Information for measurement is received from a base station, the information for measurement including frequency information related to at least one cell associated with the measurement, or the frequency information and identifier information of the at least one cell; Based on the information used for measurement and a specified list of NSA cells including information from at least one non-independent NSA cell, the measurement is performed on independent SA cells that do not include any of the at least one cells that match the cells identified by the information from the at least one NSA cell; and Send the measurement report of the SA cell to the base station.

12. The user equipment according to claim 11, wherein, The NSA cell list includes at least one of a local NSA cell list managed by the user equipment or a server NSA cell list managed by the server and sent to the user equipment.

13. The user equipment according to claim 12, wherein, The memory stores the instructions, which, when executed by the processor, cause the UE to: The base station receives a message, the message including candidate cell information related to the measurement and information on whether the candidate cell supports at least one of NSA or SA. Wherein, based on the fact that the candidate cell is an NSA cell, the frequency associated with the candidate cell and the identifier of the candidate cell are added to the local NSA cell list.

14. The user equipment according to claim 13, wherein, The memory stores the instructions, which, when executed by the processor, cause the UE to: Based on the fact that the candidate cell is an SA cell, identify whether the user equipment has registered to a TA that is different from the tracking area TA registered before receiving the message; as well as Based on the user equipment's registration with the different TA, the local NSA cell list is reset.

15. The user equipment according to claim 12, wherein, The memory stores the instructions, which, when executed by the processor, cause the UE to: Send information about NSA cells detected based on a first location of the user equipment to the server to update the server's NSA cell list, wherein the first location is identified based on a first tracking area code (TAC). as well as Receive the server NSA cell list associated with the first TAC from the server.

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