Method and device for measuring frequency in wireless communication system

Abstract

The present disclosure provides a frequency measurement method performed by a user equipment (UE) in a wireless communication system. The frequency measurement method includes: receiving a radio resource control (RRC) release message or system information, the radio resource control (RRC) release message or system information includes first frequency measurement configuration information for performing frequency measurement in an RRC inactive mode; performing frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information; receiving a first RRC recovery message, the first RRC recovery message includes an indicator requesting a measurement report in the RRC inactive mode; and sending an RRC recovery completion message including the measurement report based on the indicator.

Description

Technical Field

[0001] The present disclosure relates to methods and apparatus for measuring frequencies in a wireless communication system. Background Art

[0002] In order to meet the growing demand for wireless data traffic after the commercialization of 4G communication systems, efforts have been made to develop improved 5G communication systems or pre-5G communication systems. For this reason, 5G communication systems or pre-5G communication systems are called super 4G network communication systems or post-LTE systems. The 5G communication system standardized in the Third Generation Partnership Project (3GPP) is called the New Radio (NR) system. In order to achieve high data transmission rates, it is considered to implement 5G communication systems in millimeter wave (mmW) bands (e.g., 60GHz bands). In order to reduce the path loss of millimeter wave bands in 5G communication systems and extend the transmission distance, technologies such as beamforming, massive multiple input multiple output (MIMO), full-dimensional multiple input multiple output (FD-MIMO), array antennas, analog beamforming, and massive antennas are currently being discussed. In addition, in order to improve the system network, in the 5G communication system, technologies such as evolved small cells, advanced small cells, cloud RAN, ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP) and interference elimination are being developed. In addition, in the 5G communication system, advanced coding modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) are being developed, as well as enhanced network access schemes such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) or sparse code multiple access (SCMA).

[0003] The Internet is evolving from a human-based network where humans generate and consume information to an Internet of Things (IoT) network where distributed components such as things send or receive information to each other and process information. Internet of Everything (IoE) technology, which combines big data processing technology with IoT technology by connecting to cloud servers, etc., is emerging. In order to implement the IoT, various technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are necessary, so sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. for connection between things are being studied recently. In the IoT environment, smart Internet technology (IT) services can be provided to collect and analyze data generated by connected things and create new value for human life. The IoT is applicable to various fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical care by integrating and combining existing information technology (IT) with various industries.

[0004] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, 5G communications such as sensor networks, M2M communications, or MTC are implemented through technologies such as beamforming, MIMO, or array antennas. Cloud RAN, as an application of big data processing technology, can also be seen as an example of the integration of 5G technology and IoT technology.

[0005] As wireless communication systems develop, there is a need for a method that allows a terminal to quickly measure a frequency and report the measurement result. Summary of the invention

[0006] Technical issues

[0007] A method and apparatus for measuring frequency in a wireless communication system are provided.

[0008] Technical Solutions

[0009] According to one embodiment of the present disclosure, a frequency measurement method performed by a user equipment (UE) in a wireless communication system includes: receiving a radio resource control (RRC) release message or system information, the radio resource control (RRC) release message or system information including first frequency measurement configuration information for performing frequency measurement in an RRC inactive mode; performing frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information; receiving a first RRC recovery message, the first RRC recovery message including an indicator for requesting a measurement report in the RRC inactive mode; and sending an RRC recovery completion message including a measurement report based on the indicator.

[0010] Advantages

[0011] According to an embodiment of the present disclosure, a method and apparatus for measuring frequency in a wireless communication system are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0013] Figure 1A The structure of a long term evolution (LTE) system according to an embodiment of the present disclosure is shown;

[0014] Figure 1B The radio protocol architecture in the LTE system according to an embodiment of the present disclosure is shown;

[0015] Figure 1C The structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown;

[0016] Figure 1D The radio protocol architecture of the next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0017] Figure 1E A process between a UE and a gNB according to one embodiment of the present disclosure is shown, wherein the UE switches from a radio resource control (RRC) idle mode or an RRC inactive mode to an RRC connected mode, and carrier aggregation (CA) is configured;

[0018] Figure 1F A process between a UE and a gNB according to one embodiment of the present disclosure is shown, wherein the UE performs early frequency measurement and sends a fast measurement report in RRC idle mode or RRC inactive mode;

[0019] Figure 1G A process between a UE and a gNB according to one embodiment of the present disclosure is shown, wherein the UE performs early frequency measurement and sends a fast measurement report in RRC idle mode or RRC inactive mode;

[0020] Figure 1H Another process between a UE and a gNB according to one embodiment of the present disclosure is shown, wherein the UE performs early frequency measurement and sends a fast measurement report in an RRC idle mode or an RRC inactive mode;

[0021] Fig. 1I The present invention shows a process of updating a first radio point access network (RAN) notification area according to an embodiment of the present disclosure;

[0022] Figure 1J The invention shows a process of updating the second RAN notification area according to an embodiment of the present disclosure;

[0023] Figure 1K A process between a UE and a gNB according to an embodiment of the present disclosure is shown, wherein a UE in an RRC inactive mode falls back to an RRC idle mode due to an instruction of a base station when attempting to resume connection with a network;

[0024] Figure 1L A flowchart showing operations of performing frequency measurement and sending a fast measurement report in RRC idle mode or RRC inactive mode performed by a UE according to an embodiment of the present disclosure;

[0025] Figure 1M The structure of a UE according to an embodiment of the present disclosure is shown; and

[0026] Figure 1N The structure of a transmission reception point (TRP) device in a mobile communication system according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0027] According to one embodiment of the present disclosure, a frequency measurement method performed by a user equipment (UE) in a wireless communication system includes receiving a radio resource control (RRC) release message or system information, the radio resource control (RRC) release message or system information including first frequency measurement configuration information for frequency measurement in an RRC inactive mode; performing frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information; receiving a first RRC recovery message, the first RRC recovery message including an indicator for requesting a measurement report in the RRC inactive mode; and sending an RRC recovery completion message including a measurement report based on the indicator.

[0028] The first frequency measurement configuration information for frequency measurement may include at least one of the following items: a time period for performing frequency measurement, at least one frequency measurement information group or list, a timer value for frequency measurement, information about a valid area for frequency measurement to be performed, or a threshold for reporting a measurement report.

[0029] The frequency measurement method may also include receiving an RRC release message including radio point access network (RAN) notification area update information during the RAN notification area update process; when the RRC release message includes new second frequency measurement configuration information, updating the first frequency measurement configuration information to second frequency measurement configuration information; and performing frequency measurement in RRC inactive mode based on the second frequency measurement configuration information.

[0030] The frequency measurement method may further include, when the RRC release message including the RAN notification area update information does not include new second frequency measurement configuration information, performing frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information.

[0031] The frequency measurement method may also include receiving an RRC setup message instructing the UE to fall back to RRC idle mode; and including an indicator indicating support for frequency measurement in RRC idle mode or RRC inactive mode measurement in the system information of the currently resident cell, and when a measurement report in RRC inactive mode exists, sending an RRC setup completion message in response to the RRC setup message, the RRC setup completion message including the measurement report in RRC inactive mode.

[0032] A frequency measurement report receiving method performed by a base station in a wireless communication system includes: sending or broadcasting an RRC release message or system information, the RRC release message or system information including first frequency measurement configuration information for frequency measurement in an RRC inactive mode; sending a first RRC recovery message including an indicator requesting a measurement report in an RRC inactive mode; and receiving an RRC recovery completion message including a measurement report.

[0033] The first frequency measurement configuration information for frequency measurement may include at least one of the following items: a time period for performing frequency measurement, at least one frequency measurement information group or list, a timer value for frequency measurement, information about a valid area for frequency measurement to be performed, or a threshold for reporting a measurement report.

[0034] The frequency measurement report receiving method may further include sending an RRC release message including RAN notification area update information in the RAN notification area update procedure, and when the UE is configured to perform frequency measurement in the RRC inactive mode, the RRC release message may include new second frequency measurement configuration information.

[0035] The frequency measurement report receiving method may also include broadcasting system information, the system information including an indicator indicating support for frequency measurement in RRC idle mode or in RRC inactive mode; sending an RRC establishment message instructing the UE to fall back to RRC idle mode; and in response to the RRC establishment message, receiving an RRC establishment completion message including a measurement report in RRC idle mode or in RRC inactive mode.

[0036] According to another embodiment of the present disclosure, a UE performing frequency measurement in a wireless communication system includes a transceiver; and a controller, the controller being configured to control the UE to receive an RRC release message or system information, the RRC release message or the system information including first frequency measurement configuration information for frequency measurement in an RRC inactive mode, perform frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information, receive a first RRC recovery message including an indicator requesting a measurement report in the RRC inactive mode, and send an RRC recovery completion message including a measurement report based on the indicator.

[0037] The first frequency measurement configuration information for frequency measurement may include at least one of the following items: a time period for performing frequency measurement, at least one frequency measurement information group or list, a timer value for frequency measurement, information about a valid area for frequency measurement to be performed, or a threshold for reporting a measurement report.

[0038] The controller can also be configured to control the UE to: receive an RRC release message including RAN notification area update information during the RAN notification area update process; when the RRC release message includes new second frequency measurement configuration information, update the first frequency measurement configuration information to the second frequency measurement configuration information; and perform frequency measurement in the RRC inactive mode based on the second frequency measurement configuration information.

[0039] The controller may also be configured to control the UE to perform frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information when new second frequency measurement configuration information is not included in the RRC release message including the RAN notification area update information.

[0040] The controller can also be configured to control the UE to: receive an RRC setup message instructing the UE to fall back to RRC idle mode; and include an indicator indicating support for frequency measurement in RRC idle mode or in RRC inactive mode measurement in the system information of the currently resident cell, and when a measurement report of the RRC inactive mode exists, send an RRC setup completion message in response to the RRC setup message, and the RRC setup completion message includes the measurement report in the RRC inactive mode.

[0041] According to another embodiment of the present invention, a base station for receiving a frequency measurement report in a wireless communication system includes a transceiver; a controller, the controller being configured to control the base station: sending or broadcasting an RRC release message or system information, the RRC release message or system information including first frequency measurement configuration information for frequency measurement in an RRC inactive mode; sending a first RRC recovery message, the first RRC recovery message including an indicator requesting a measurement report to be reported in an RRC inactive mode; and receiving an RRC recovery completion message including a measurement report.

[0042] The first frequency measurement configuration information for frequency measurement may include at least one of the following items: a time period for performing frequency measurement, at least one frequency measurement information group or list, a timer value for frequency measurement, information about a valid area for frequency measurement to be performed, or a threshold for reporting a measurement report.

[0043] The controller may also be configured to control the base station to send an RRC release message including radio access network (RAN) notification area update information during the RAN notification area update procedure, and when the UE is configured to perform frequency measurement in the RRC inactive mode, the RRC release message may include new second frequency measurement configuration information.

[0044] The controller can also be configured to control the base station: broadcast system information including an indicator indicating support for frequency measurement in RRC idle mode or RRC inactive mode; send an RRC setup message instructing the UE to fall back to RRC idle mode; and in response to the RRC setup message, receive an RRC setup completion message including a measurement report in RRC idle mode or RRC inactive mode.

[0045] Invention Mode

[0046] It may be helpful to set forth the definitions of certain words and phrases used in this patent document: the terms "include" and "comprising" and their derivatives mean including but not limited to; the term "or" is inclusive, meaning and / or; the phrases "associated with" and "associated with" and their derivatives may mean including, included within, interconnected with, contain, contained within, connected to or connected with, coupled to or coupled with, communicable with, cooperating with, interleaved with, juxtaposed, proximate, incorporated into or combined with, possessing, having the property of, etc.; and the term "controller" means any device, system, or portion thereof that controls at least one operation, which may be implemented in hardware, firmware, or software, or some combination of at least two thereof. It should be noted that the functionality associated with any particular controller may be centralized or distributed, locally or remotely.

[0047] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and implemented in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, programs, functions, objects, classes, instances, related data or a part thereof that are suitable for implementation with appropriate computer-readable program codes. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD) or any other type of memory. "Non-transient" computer-readable media does not include wired, wireless, optical or other communication links that transmit transient electrical signals or other signals. Non-transient computer-readable media include media that can permanently store data and media that can store data and overwrite the data at a later stage, such as rewritable optical discs or erasable storage devices.

[0048] Definitions for certain words and phrases are provided in this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of the defined words and phrases.

[0049] Discussed below Figures 1A to 1N The multiple embodiments used to describe the principles of the present disclosure in this patent document are only for illustration and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art should understand that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0050] Embodiments of the present disclosure will now be described more fully with reference to the accompanying drawings. In the following description of the embodiments of the present disclosure, descriptions of technologies that are well known in the art and not directly related to the present disclosure are omitted. This is to clearly convey the gist of the present disclosure by omitting any unnecessary explanations.

[0051] For the same reason, some elements in the accompanying drawings may be enlarged, omitted or schematically shown. In addition, the actual size of each element is not necessarily shown in the accompanying drawings. In the accompanying drawings, the same or corresponding elements are represented by the same reference numerals.

[0052] The advantages and features of the present disclosure and the methods for achieving these advantages and features will become apparent with reference to the embodiments of the present disclosure described in detail below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present disclosure thorough and complete and will fully convey the concepts of the present disclosure to those skilled in the art. The scope of the present disclosure is defined only in the claims. Throughout the specification, the same reference numerals or characters refer to the same elements.

[0053] Throughout the disclosure, the expression "at least one of a, b, or c" means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0054] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, and a multimedia system capable of performing a communication function.

[0055] In this disclosure, a controller may also be referred to as a processor.

[0056] In this disclosure, a layer (or a layer device) may also be referred to as an entity.

[0057] It should be understood that each box in the flowchart and the combination of multiple boxes in the flowchart can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that the instructions executed by the processor of the computer or other programmable data processing device can generate a device for performing the function specified in the flowchart box. These computer program instructions can also be stored in a computer-available or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can generate a finished product including an instruction device for performing the function specified in the flowchart box. The computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable data processing device, and then a computer executable process is generated, so that the instructions executed on the computer or other programmable data processing device provide steps for implementing the functions specified in one or more flowchart boxes.

[0058] In addition, each square block can represent a module, section or code portion, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative embodiments, the functions noted in the square blocks may not appear in the order presented. For example, two square blocks shown in succession can actually be executed substantially simultaneously, or these square blocks can sometimes be executed in reverse order according to the functions involved.

[0059] The term "unit" or "device" used herein means a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and performs a certain function. However, the term "unit" or "device" is not limited to software or hardware. The term "unit" or "device" can be configured to be included in an addressable storage medium or reproduce one or more processors. Therefore, as an example, the term "unit" or "device" can include object-oriented software components, class components and task components, as well as processes, functions, attributes, processes, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided by components and "units" or "devices" can be combined into a smaller number of components and "units" or "devices", or can be further separated into additional components and "units" or "devices". In addition, components and "units" or "devices" can be implemented as reproducing one or more central processing units (CPUs) in a device or a secure multimedia card. According to an embodiment of the present disclosure, a "unit" or "device" can include one or more processors.

[0060] In the following description, for the convenience of explanation, terms identifying access nodes, terms indicating network entities, terms indicating messages, terms indicating interfaces between network entities, terms indicating various types of identification information, etc. are exemplified. Therefore, the present disclosure is not limited to the terms described below, and other terms representing objects having equivalent technical meanings may be used.

[0061] In the following, for the convenience of description, the present disclosure uses the terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to the terms and names, but can also be applied to systems that comply with other standards. In the present disclosure, for the convenience of explanation, eNB can be used interchangeably with gNB. In other words, a base station described as an eNB can also indicate a gNB. The term "terminal" can refer to mobile phones, NB-IoT devices, sensors, and various other wireless communication devices.

[0062] In the next generation mobile communication system, the base station needs to quickly configure carrier aggregation (CA) or dual connectivity (DC) for the terminal to support services with high data transmission rate and low transmission delay. However, the base station needs the measurement report provided by the terminal in order to configure these technologies for the terminal. Therefore, a method is needed to enable the base station to receive the fast measurement report provided by the terminal.

[0063] According to an embodiment of the present disclosure, in a next-generation mobile communication system, a terminal in a radio resource control (RRC) idle mode or an RRC inactive mode is enabled to send a fast measurement report on adjacent frequencies to a base station so that the base station can quickly configure CA or DC for the terminal. More specifically, the terminal is enabled to perform frequency measurement based on pre-configured frequency configuration information before configuring a connection with a network, and the measurement report is immediately sent when the terminal configures a connection with the network, so that the base station can quickly configure CA or DC for the terminal.

[0064] The present disclosure describes a method for enabling a terminal in RRC inactive mode to perform frequency measurement before configuring an RRC connection with a network and provide a fast measurement report when or after configuring the RRC connection. According to one embodiment of the present disclosure, a base station may quickly configure CA or DC for a terminal.

[0065] Embodiments of the present disclosure can be described as follows.

[0066] According to the present disclosure, when a terminal in RRC connected mode receives frequency measurement configuration information and an indication to release the RRC connection and enter RRC idle mode or RRC inactive mode from a base station, the terminal can perform frequency measurement in RRC idle mode or RRC inactive mode within the duration or time period configured in the frequency measurement configuration information.

[0067] However, when the frequency measurement configuration information does not include information about the frequency list to be measured, and the frequency measurement configuration information for the terminal to perform frequency measurement in the RRC idle mode or the RRC inactive mode is broadcast by the cell on which the terminal resides during the cell reselection process, the terminal can receive the frequency measurement configuration information and can perform frequency measurement. When it is necessary to configure the RRC connection with the network, the terminal can indicate the presence of the result of the frequency measurement performed in the RRC idle mode or the RRC inactive mode, while configuring the RRC connection with the base station.

[0068] At this time, when the terminal performs random access, the information of the result of the frequency measurement performed in the RRC idle mode or the RRC inactive mode can be indicated by the preamble. For example, a specific preamble can be configured to be used as an indicator in the system information. Alternatively, a specific preamble can be configured to indicate that many uplink transmission resources are required. Alternatively, it can be promised to use a specific preamble as an indicator. When the base station recognizes the indicator, the base station can include an indicator indicating the sending of a measurement report in the random access response, and send a random access response including the indicator. In another embodiment, since the random access response sent by the base station can indicate an instruction to send a measurement report, the indicator can be omitted.

[0069] When the terminal receives the uplink transmission resource from the random access response, the terminal can send and send the measurement report together with message 3 (such as RRCSetupRequest message or RRCResumeRequest message). Thereafter, the terminal can perform network connection configuration, and when the base station sends message 4 (such as RRCSetup message or RRCresume message) to the terminal, the base station can send message 4 including CA configuration information or DC configuration information, thereby quickly restoring, changing or reconfiguring CA or DC of the terminal.

[0070] In another embodiment, an indicator indicating the presence of a result of frequency measurement performed in RRC idle mode or RRC inactive mode may be included in message 3 (e.g., an RRCSetupRequest message or an RRCresumeRequest message) sent after the terminal performs random access, and then sent. When the base station sends message 4 (e.g., an RRCSetup message or an RRCResume message) to the terminal, the base station may include an indicator instructing the terminal to send a measurement report in message 4, and send message 4 including this indicator. In another embodiment, since message 4 may indicate an instruction to send a measurement report, the indicator may be omitted. The terminal may send a measurement report via message 5 (e.g., an RRCSetupComplete message or an RRCResumeComplete message).

[0071] Since the terminal in the RRC inactive mode resumes or activates the security procedure (encryption and decryption or integrity protection and authentication) on the signaling radio bearer 1 (SRB1) when sending the RRCresumeRequest message, the terminal can strengthen security and receive message 4, and even when sending a measurement report through message 5, the terminal can strengthen security and report the result of the frequency measurement. The base station can include CA configuration information or DC configuration information in the RRC message by using the measurement report and send the RRC message. Accordingly, the base station can quickly resume, change or reconfigure CA or DC for the terminal.

[0072] The present disclosure also describes an efficient signaling method for allowing a network or a base station to more efficiently configure or update frequency measurement configuration information for a terminal that is movable in an RRC inactive mode.

[0073] There are significant differences between a terminal in RRC idle mode and a terminal in RRC inactive mode in that: a terminal in RRC inactive mode can configure a quick connection because the base station and the terminal store the terminal context and reuse the terminal context when configuring a connection next time; and a terminal in RRC inactive mode periodically updates a radio access network (RAN) notification area, thereby updating the area where the RRC inactive mode needs to be maintained from the network.

[0074] According to the present disclosure, when a terminal in an RRC connected mode receives frequency measurement configuration information and an instruction to release the RRC connection and enter the RRC inactive mode from a base station, the terminal can perform frequency measurement in the RRC inactive mode within a duration or time period configured in the frequency measurement configuration information. When the terminal in the RRC inactive mode deviates from the configured RAN notification area while moving, the terminal configures a network connection to perform a RAN Notification Area Update (RNAU) procedure.

[0075] In one embodiment described in the present invention, in order to update the RAN notification area, the base station can configure, update or partially change new frequency measurement configuration information for the terminal that has been connected to the network. The base station can retrieve the terminal context from the source base station through the connection recovery identifier indicated by the terminal in message 3 (RRCResume Request), and can determine whether the terminal is configured to perform frequency measurement in RRC inactive mode. In another embodiment, when the terminal sends message 3 to update the RAN notification area, the terminal can include information that frequency measurement has been configured in RRC inactive mode in the form of an indicator in message 3, or that the T331 timer has expired or is running or new frequency configuration information is required, and can send message 3 including this information to the base station.

[0076] After the base station determines whether the terminal can perform frequency measurement in the RRC inactive mode, when the base station sends an RRC message (e.g., an RRCRelease message) including information of the updated RAN notification area to the terminal, the base station may include new frequency measurement configuration information in the RRC message and send the RRC message including the new frequency measurement configuration information. The new frequency measurement configuration information may include configuration information, such as a frequency list to be measured, a physical cell identifier list, a measurement duration, or a valid area (e.g., a cell identifier list) on which measurement is to be performed.

[0077] According to one embodiment of the present disclosure, a process is described, in which, when a base station or cell connected to a terminal supports frequency measurement in an RRC idle mode or an RRC inactive mode or system information indicates support for frequency measurement, after the terminal sends a measurement report to the base station, the terminal stops a timer (T331) to perform frequency measurement in an RRC idle mode or an RRC inactive mode, and discards or releases the frequency measurement configuration information or discards the result of the frequency measurement.

[0078] According to the description of the present disclosure, a terminal in RRC inactive mode or RRC idle mode configures a certain area (e.g., a valid area) for frequency measurement. In other words, the terminal performs frequency measurement in RRC inactive mode or RRC idle mode only within the valid area, and when the valid area is exceeded, the terminal can stop the timer, release the frequency measurement configuration information, discard the frequency measurement result, or stop the frequency measurement.

[0079] The valid area may be indicated as, for example, a list of physical cell identifiers or a list of RAN notification area indicators. The present disclosure describes an embodiment in which a terminal in RRC inactive mode separately configures a valid area and a RAN notification area, and an embodiment in which the burden on the terminal and the signaling overhead are reduced by enabling the terminal in RRC inactive mode to replace the RAN notification area with the valid area or vice versa (i.e., replace the valid area with the RAN notification area). When a valid area is indicated to the terminal, in order to implement this terminal, the tracking area needs to be maintained and updated, and the RAN notification area also needs to be maintained and updated, and the valid area also needs to be maintained and updated, thereby increasing the overhead.

[0080] According to the present disclosure, a certain timer can be set according to the frequency configuration group or wireless point access technology used when indicating frequency measurement configuration information to the terminal in RRC inactive mode or RRC idle mode, or for each frequency, each cell or each beam. In other words, a time period or timer value indicating how long frequency measurement is to be performed on a long-term evolution (LTE) frequency (for each frequency or for each cell) can be set, and a time period or timer value indicating how long frequency measurement is to be performed on a new radio (NR) frequency (for each frequency, each cell or each beam) can be set, so that a certain timer can be set for each frequency configuration group, and thus a certain time period can be set.

[0081] Figure 1A The structure of an LTE system according to an embodiment of the present disclosure is shown.

[0082] Reference Figure 1A The radio access network (RAN) of the LTE system includes evolved node Bs (hereinafter referred to as ENBs, node Bs (NBs) or base stations) 1a-05, 1a-10, 1a-15 and 1a-20, mobility management entities (MMEs) 1a-25 and serving gateways (S-GWs) 1a-30. User equipment (UE) 1a-35 (also referred to as terminals) can access external networks via ENBs 1a-05, 1a-10, 1a-15 or 1a-20 and S-GW 1a-30.

[0083] exist Figure 1A In the LTE system, ENB 1a-05, 1a-10, 1a-15 or 1a-20 may correspond to a NB of a universal mobile telecommunications system (UMTS). ENB 1a-05, 1a-10, 1a-15 or 1a-20 is connected to UE 1a-35 through a radio channel and performs more complex functions than NB. In the LTE system, since all user traffic including real-time services such as Voice over Internet Protocol (VoIP) services is provided via a shared channel, an entity that schedules UE 1a-35 by collecting status information of UE 1a-35 such as a buffer status, an available transmission power status, and a channel status may be necessary, and ENB 1a-05, 1a-10, 1a-15 or 1a-20 may operate as an entity. A single ENB may generally control multiple cells.

[0084] For example, the LTE system can achieve a data rate of 100 Mbps using a radio access technology such as orthogonal frequency division multiplexing (OFDM) at a 20 MHz bandwidth. In addition, the ENB 1a-05, 1a-10, 1a-15, or 1a-20 can use an adaptive modulation and coding (AMC) scheme to determine a modulation scheme and a channel coding rate according to a channel state of the UE 1a-35. The S-GW 1a-30 is an entity for providing a data bearer and can configure or release a data bearer under the control of the MME 1a-25. The MME 1a-25 is an entity for performing a mobility management function and various control functions for the UE 1a-35 and can be connected to the ENB 1a-05, 1a-10, 1a-15, and 1a-20.

[0085] Figure 1B The radio protocol architecture in an LTE system according to an embodiment of the present disclosure is shown.

[0086] Reference Figure 1B The radio protocol architecture of the LTE system may include packet data convergence protocol (PDCP) layers 1b-05 and 1b-40, radio link control (RLC) layers 1b-10 and 1b-35, and medium access control (MAC) layers 1b-15 and 1b-30 for UE and ENB, respectively. The PDCP layer 1b-05 or 1b-40 is responsible for IP header compression / decompression, etc. The main functions of PDCP layer 1b-05 or 1b-40 can be summarized as follows: header compression and decompression: robust header compression (ROHC only); user data transmission; in-sequence delivery of upper layer PDUs during PDCP reestablishment in RLC acknowledgement mode (AM); for split bearers in DC (only RLCAM is supported): PDCP PDU routing for transmission and PDCP PDU reordering for reception; duplication detection of lower layer SDUs during PDCP reestablishment in RLC AM; retransmission of PDCP SDUs at handover and, for split bearers in DC, retransmission of PDCP PDUs during PDCP data recovery for RLC AM; encryption and decryption; and timer-based SDU discard in the uplink.

[0087] The RLC layer 1b-10 or 1b-35 can perform, for example, automatic repeat request (ARQ) operations by reconfiguring the PDCP packet data unit (PDU) to an appropriate size. The main functions of the RLC layer 1b-10 or 1b-35 can be summarized as follows: transmission of upper layer PDUs; error correction through ARQ (only for AM data transmission); concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transmission); resegmentation of RLC data PDUs (only for AM data transmission); reordering of RLC data PDUs (only for UM and AM data transmission); duplicate detection (only for UM and AM data transmission); protocol error detection (only for AM data transmission); RLC SDU discard (only for UM and AM data transmission); and RLC reconstruction.

[0088] The MAC layer 1b-15 or 1b-30 is connected to multiple RLC layers configured for a single UE and can multiplex RLC PDUs into MAC PDUs and demultiplex RLC PDUs from MAC PDUs. The main functions of the MAC layer 1b-15 or 1b-30 can be summarized as follows: mapping between logical channels and transmission channels; multiplexing MAC SDUs belonging to one or different logical channels into a transport block (TB) transmitted to the physical layer on the transport channel, or demultiplexing MAC SDUs belonging to one or different logical channels from a transport block (TB) transmitted from the physical layer on the transport channel; scheduling information reporting; error correction through HARQ; priority handling between logical channels of one UE; priority handling between UEs through dynamic scheduling; MBMS service identification; transport format selection; and padding;

[0089] The physical (PHY) layer 1b-20 or 1b-25 may channel-code and modulate upper layer data into OFDM symbols and transmit the OFDM symbols through a radio channel, or demodulate OFDM symbols received through a radio channel and channel-decode the OFDM symbols and transmit to an upper layer.

[0090] Figure 1C The structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0091] Reference Figure 1C , the RAN of a next generation mobile communication system (e.g., a new radio (NR) or 5G system) may include a new radio node B (hereinafter referred to as NR gNB or NR base station) 1c-10 and a new radio core network (NR CN) 1c-05. A new radio user equipment (NR UE) or UE 1c-15 may access an external network via the NR gNB 1c-10 and the NR CN 1c-05.

[0092] exist Figure 1CIn the present invention, the NR gNB 1c-10 may correspond to the eNB of the existing LTE system. The NR gNB 1c-10 is connected to the NR UE 1c-15 through a radio channel and can provide better services compared with the NB. In the next generation mobile communication system, since all user traffic is provided via a shared channel, it may be necessary to schedule an entity of the UE 1a-35 by collecting status information of the UE such as the buffer status, the available transmit power status, and the channel status, and the NR gNB 1c-10 may operate as an entity. A single NR gNB 1c-10 typically controls multiple cells. Compared with the current LTE system, the NR system may have a bandwidth greater than the existing maximum bandwidth to achieve an ultra-high data rate, and may use OFDM as a radio access technology, and may additionally use beamforming technology. In addition, the NR system may use an AMC scheme to determine the modulation scheme and channel coding rate according to the channel status of the NR UE 1c-15.

[0093] NR CN 1c-05 can perform various functions such as mobility support, bearer setting, and quality of service (QoS) setting. NR CN 1c-05 is an entity for performing mobility management functions, and various control functions of NR UE 1c-15 can be connected to multiple base stations. The next-generation mobile communication system can cooperate with the existing LTE system, and NR CN 1c-05 can be connected to MME 1c-25 through a network interface. MME 1c-25 can be connected to eNB 1c-30 which is an existing base station.

[0094] Figure 1D The radio protocol architecture of the next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0095] Reference Figure 1D , the radio protocol architecture of the next generation mobile communication system may include NR Service Data Adaptation Protocol (SDAP) layers 1d-01 and 1d-45, NR PDCP layers 1d-05 and 1d-40, NR RLC layers 1d-10 and 1d-35, and NR MAC layers 1d-15 and 1d-30 for UE and NR gNB, respectively. The main functions of the NR SDAP layer 1d-01 or 1d-45 may include some of the following functions: transmission of user plane data; mapping between QoS flows and DRBs for both DL and UL; marking QoS flow IDs in both DL and UL data packets; and reflected QoS flow to DRB mapping for UL SDAP PDU.

[0096] For the above-mentioned SDAP layer, the UE can configure via an RRC message whether to use the header of the SDAP layer or the function of the SDAP layer for each PDCP layer, each bearer, or each logical channel. When configuring the SDAP header, the non-access layer (NAS) reflected QoS 1-bit indicator and the access layer (AS) reflected QoS 1-bit indicator of the SDAP header can indicate that the UE updates or reconfigures the QoS flow for the data bearer and the uplink (UL) and downlink (DL). The above-mentioned SDAP header may include a QoS flow ID indicating QoS. The above-mentioned QoS information can be used as data processing priority information, scheduling information, etc. to support smooth services.

[0097] The main functions of NR PDCP layer 1d-05 or 1d-40 may include some of the following functions: header compression and decompression: ROHC only; transmission of user data; in-order delivery of upper layer PDUs; out-of-order delivery of upper layer PDUs; reordering of PDCP PDUs for reception; duplicate detection of lower layer SDUs; retransmission of PDCP SDUs; ciphering and deciphering; timer-based SDU discard in uplink.

[0098] The reordering function of the NR PDCP layer 1d-05 or 1d-40 may include a function of reordering the PDCP PDUs received from the lower layer based on the PDCP sequence number (SN), and a function of transmitting the reordered data to the upper layer in sequence. Alternatively, the reordering function of the NR PDCP layer 1d-05 or 1d-40 may include at least one of the following functions: a function of immediately transmitting the reordered data without considering the sequence, a function of recording the lost PDCP PDUs by reordering the PDCP PDUs, a function of reporting the status of the lost PDCP PDUs to the transmitter, or a function of requesting retransmission of the lost PDCP PDUs.

[0099] The main functions of NR RLC layer 1d-10 or 1d-35 may include some of the following functions: transmission of upper layer PDUs; in-order delivery of upper layer PDUs; out-of-order delivery of upper layer PDUs; error correction through ARQ; concatenation, segmentation and reassembly of RLC SDUs; resegmentation of RLC data PDUs; reordering of RLC data PDUs; duplicate detection; protocol error detection; RLC SDU discard; and RLC reconstruction;

[0100] The in-sequence delivery of NR RLC layer 1d-10 or 1d-35 means the function of delivering the RLC SDU received from the lower layer to the upper layer in sequence. When a single RLC SDU is split into multiple RLC SDUs and received, the sequential transmission of NR RLC layer 1d-10 or 1d-35 may include a function of reassembling multiple RLC SDUs and transmitting the RLC SDUs; a function of reordering the received RLC PDUs based on the RLC SN or PDCP SN; a function of recording the lost RLC PDUs by reordering the RLC PDUs; a function of reporting the status of the lost RLC PDUs to the transmitter; a function of requesting retransmission of the lost RLC PDUs; a function of transmitting only the RLC SDUs before the lost RLC SDUs to the upper layer in sequence when there are lost RLC SDUs; a function of transmitting all RLC SDUs received before the timer is started to the upper layer in sequence when a timer expires despite the presence of lost RLC SDUs; or a function of transmitting all RLC SDUs received until the current time to the upper layer in sequence when a timer expires despite the presence of lost RLC SDUs.

[0101] In out-of-order delivery of the NR RLC layer 1d-10 or 1d-35, the NR RLC layer 1d-10 or 1d-35 may process the RLC PDU in the order of reception regardless of the sequence number and deliver the RLC PDU to the NR PDCP layer 1d-05 or 1d-40 (out-of-order delivery), and when the NR RLC layer 1d-10 or 1d-35 receives segments, the NR RLC layer 1d-10 or 1d-35 may receive segments stored in a buffer or to be received later, reconfigure the received segments into a whole RLC PDU, and then process and deliver the whole RLC PDU to the NR PDCP layer 1d-05 or 1d-40. The NR RLC layer 1d-10 or 1d-35 may not include a cascading function, and the cascading function may be performed by the NR MAC layer 1d-15 or 1d-30 or replaced by a multiplexing function of the NR MAC layer 1d-15 or 1d-30.

[0102] Out-of-order delivery of NR RLC layer 1d-10 or 1d-35 may include a function of immediately delivering the RLC SDU received from the lower layer to the upper layer out of order. Out-of-order delivery of NR RLC layer 1d-10 or 1d-35 may include at least one of the following functions: a function of reassembling and transmitting multiple RLC SDUs when a single RLC SDU is split into multiple RLC SDUs and received, a function of storing the RLC SN or PDCP SN of the received RLC PDU and recording the lost RLC PDU by sorting the RLC PDUs.

[0103] The NR MAC layer 1d-15 or 1d-30 can be connected to multiple NR RLC layers 1d-10 or 1d-35 configured for a single UE, and the main functions of the NR MAC layer 1d-15 or 1d-30 can include some of the following functions: mapping between logical channels and transport channels; multiplexing / demultiplexing of MAC SDU; scheduling information reporting; error correction through HARQ; priority handling between logical channels of one UE; priority handling between UEs through dynamic scheduling; MBMS service identification; transport format selection; and padding.

[0104] The PHY layer 1d-20 or 1d-25 may channel-code and modulate upper layer data into OFDM symbols and transmit the OFDM symbols through a radio channel, or demodulate OFDM symbols received through a radio channel and channel-decode the OFDM symbols and transmit to an upper layer.

[0105] In the next generation mobile communication system, the UE may perform frequency measurement in RRC idle mode while performing a cell reselection process. The frequency measurement performed when performing a cell reselection process may refer to intra-frequency measurement or serving cell or Pcell measurement for a frequency configured or broadcast by a camped cell. However, in addition to intra-frequency measurement or serving cell or Pcell measurement, the UE does not perform inter-frequency measurement and does not send a measurement report to the network separately.

[0106] In other words, when the UE first searches for a suitable cell via a cell reselection process and resides on the found suitable cell, and then switches to the RRC connection mode via the RRC connection configuration process, the base station can configure the UE in the RRC connection mode with the frequency to be measured (e.g., a frequency list) or frequency band, the order of measuring priority frequencies, the beam to be measured, the filtering scheme used to measure the frequency strength in the frequency measurement process (e.g., L1 filtering, L2 filtering, L3 filtering, or the coefficients and calculation scheme used for frequency measurement), the event or condition based on which the frequency measurement is started, the standard based on which the frequency measurement is compared with the current serving cell (or the currently residing frequency), the measurement report to be sent according to what event or condition, the standard or condition that the reporting frequency needs to meet compared with the current serving cell (or the currently residing frequency), and the time interval for sending the measurement report. The UE measures the corresponding frequency according to the frequency configuration configured by the base station, and sends the measurement report according to the corresponding event or condition. The base station can determine whether to apply CA or DC to the UE by using the measurement report received from the UE.

[0107] The present disclosure describes an embodiment in which a UE of a next generation mobile communication system performs frequency measurement in an RRC idle mode or an RRC inactive mode (a mode before the UE transitions to an RRC connected mode), and indicates the presence of a measurement report to a base station when the UE configures a connection with a network, and enters an RRC connected mode to send a fast measurement report. According to this embodiment, the base station can quickly configure CA or DC for the UE based on the measurement report in the RRC idle mode or the RRC inactive mode.

[0108] Specifically, when the base station allows a UE in RRC connected mode that has configured a network connection to switch to RRC idle mode or RRC inactive mode, the base station can configure, through an RRC message, information about the frequency measured by the UE in RRC idle mode or RRC inactive mode, or information about the time period (or duration) for the UE to measure the frequency in RRC idle mode or RRC inactive mode, or area information (or a cell list) about the area where the UE measures the frequency in RRC idle mode or RRC inactive mode, and can instruct the UE to perform frequency measurement in RRC idle mode or RRC inactive mode.

[0109] Furthermore, the UE can read the system information of the new camping cell while performing the cell reselection operation each time it moves, and can perform a specific process according to the system information, such as whether to continue or terminate the frequency measurement in the RRC idle mode or the RRC inactive mode, whether to extend the measurement duration (e.g., timer restart), whether to report the measurement report, or whether to discard the measurement report. In the present disclosure, efficient UE operation is described in association with the process.

[0110] In the present invention, a bearer may include an SRB and a DRB, wherein an SRB represents a signaling radio bearer and a DRB represents a data radio bearer. An unacknowledged mode (UM) DRB represents a DRB using an RLC layer operating in an UM, and an acknowledged mode (AM) DRB represents a DRB using an RLC layer operating in an AM.

[0111] Figure 1E A process between a UE and a gNB according to an embodiment of the present disclosure is shown, in which the UE switches from an RRC idle mode or an RRC inactive mode to an RRC connected mode and CA is configured.

[0112] exist Figure 1E In the present invention, the base station may allow a UE in RRC connected mode with a configured network connection to switch to RRC idle mode or RRC inactive mode due to a specific reason. The specific reason may include, for example, insufficient scheduling resources of the base station or stopping data transmission and reception with the UE for a certain period of time.

[0113] The base station may instruct the UE to transition to the RRC idle mode or the RRC inactive mode by sending an RRC release message to the UE. The base station may instruct the UE to transition to the RRC inactive mode by including an indicator (suspend-config) in the RRC release (RRC Release) message. In more detail, when the RRC release (RRC Release) message does not include the indicator (suspend-config), the UE may transition to the RRC idle mode (operation 1e-05).

[0114] When a UE that has transitioned to RRC idle mode or RRC inactive mode needs to connect to a network due to a specific reason, the UE may perform a random access procedure, receive a random access response, request an RRC connection configuration, and receive an RRC message for performing an RRC connection configuration (operations 1e-10, 1e-15, 1e-20, 1e-25, 1e-30, 1e-35, and 1e-40).

[0115] The UE establishes reverse transmission synchronization via a random access procedure and sends an RRCSetupRequest message to the base station (operation 1e-25). The RRCSetupRequest message may include, for example, a cause for establishing a connection to configure an identifier of the UE.

[0116] The base station sends an RRCSetup message to the UE so that the UE configures the RRC connection (operation 1e-30). The RRCSetup message may include at least one of configuration information for each logical channel, configuration information for each bearer, configuration information for the PDCP layer, configuration information for the RLC layer, or configuration information for the MAC layer.

[0117] The RRCSetup message may allocate a bearer identifier (e.g., an SRB identifier or a DRB identifier) ​​for each bearer, and may indicate the configuration of the PDCP layer, RLC layer, MAC layer, and PHY layer for each bearer. The RRCSetup message may configure the length of the PDCP SN used in the PDCP layer (e.g., 12 bits or 18 bits) for each bearer, and may configure the length of the RLC SN used in the PDCP layer (e.g., 12 bits or 18 bits). The RRCSetup message may indicate whether the header compression and decompression protocol is used in the uplink or downlink of the PDCP layer for each bearer, and may indicate whether to perform integrity protection or verification procedures. The RRCSetup message may also indicate whether to perform out-of-order delivery at the PDCP layer.

[0118] The UE that has configured the RRC connection sends an RRCSetupComplete message to the base station (operation 1e-40). The RRCSetupComplete message may include a control message such as a SERVICE REQUEST message, which indicates that the UE requests access to a mobility management function (AMF) or a mobility management entity (MME) for bearer configuration of a specific service. The base station may send the SERVICE REQUEST message included in the RRCSetupComplete message to the AMF or MME, and the AMF or MME may determine whether to provide the service requested by the UE.

[0119] When the base station determines to provide the service requested by the UE, the AMF or MME sends an INITIAL CONTEXT SETUP REQUEST message to the base station. The INITIAL CONTEXT SETUP REQUEST message may include, for example, QoS information to be applied during DRB configuration and security-related information to be applied to the DRB (e.g., security keys and security algorithms).

[0120] The base station transmits and receives a SecurityModeCommand message and a SecurityModeComplete message to and from the UE to configure security, and when the security configuration is completed, transmits an RRCReconfiguration message to the UE (operation 1e-45).

[0121] The RRCReconfiguration message may allocate a bearer identifier (e.g., an SRB identifier or a DRB identifier) ​​for each bearer, and may indicate the configuration of the PDCP layer, RLC layer, MAC layer, and PHY layer for each bearer. The RRCReconfiguration message may configure the length of the PDCP SN used in the PDCP layer (e.g., 12 bits or 18 bits) for each bearer, and may configure the length of the RLC SN used in the PDCP layer (e.g., 12 bits or 18 bits). The RRCReconfiguration message may indicate whether the header compression and decompression protocol is used in the uplink or downlink of the PDCP layer for each bearer, and may indicate whether to perform integrity protection or verification procedures. The RRCReconfiguration message may also indicate whether to perform out-of-order delivery at the PDCP layer.

[0122] The RRCReconfiguration message may include configuration information of the DRB to process user data, and the UE configures the DRB by applying the configuration information and sends an RRCReconfigurationComplete message to the base station (operation 1e-50). The base station that has completed the DRB configuration with the UE may send an INITIAL CONTEXT SETUP COMPLETE message to the AMF or MME and complete the connection (operation 1e-50).

[0123] When all these processes are completed, the UE sends data to the base station or receives data from the base station via the core network (operations 1e-55 and 1e-60). According to one embodiment, the data transmission process may generally include three operations, such as RRC establishment, security establishment, and DRB configuration. The base station may send an RRCReconfiguration message to the UE to update, add, or change the establishment for a specific reason (operation 1e-65).

[0124] The RRCReconfiguration message may configure configuration information of the frequencies to be measured by the UE (eg, a frequency list to be measured, frequency measurement duration, frequency measurement conditions, conditions for sending measurement reports, and cell identifiers for sending measurement reports).

[0125] The UE can perform frequency measurement according to the frequency measurement configuration information, and when a certain condition is met (for example, when the signal strength of a certain frequency is greater than a certain reference value (for example, a threshold) or the signal strength (frequency) of the current serving cell is less than a certain reference value (for example, a threshold)), the UE can send a measurement report to the base station (operation 1e-60).

[0126] In response to sending the measurement report, the base station may send an RRCReconfiguration message based on the measurement report (operation 1e-65). The base station may configure an additional Scell ​​and configure CA for the UE by including the Scell ​​configuration information in the RRCReconfiguration message and sending an RRCReconfiguration message including the Scell ​​configuration information of the UE, and may configure DC for the UE by including the secondary cell group configuration information in the RRCReconfiguration message and sending the RRCReconfiguration message including the secondary cell group configuration information to the UE.

[0127] When the base station configures CA for the UE, it may allow the Scell ​​configured by using a MAC Control Element (MAC CE) to switch to an active, inactive or dormant state.

[0128] The process of configuring CA or DC for a UE by a base station can be summarized as follows. First, when the UE configures a connection with a base station and the base station configures frequency measurement configuration information for the UE in RRC connection mode, the UE performs frequency measurement based on the frequency measurement configuration information and sends a measurement report to the base station. The base station can configure the configuration information of the additional Scell ​​as an RRC message based on the measurement report performed by the UE to configure CA for the UE, and can make the Scell ​​active, dormant, or inactive by using MAC CE. The base station can configure the additional secondary cell group configuration information based on the measurement report sent by the UE to configure DC for the UE.

[0129] As described above, when the base station configures CA or DC for the UE, the UE first needs to enter the RRC connection mode to receive frequency configuration information, perform frequency measurement, and send a measurement report. Accordingly, sending the measurement report may be performed very late, so CA or DC may be configured very late. To solve this problem, according to an embodiment of the present disclosure, the UE is enabled to efficiently perform frequency measurement in the RRC idle mode or the RRC inactive mode, and send the measurement report immediately when the network connection is configured.

[0130] Figure 1F A process between a UE and a gNB according to an embodiment of the present disclosure is shown, wherein the UE performs early frequency measurement and sends a fast measurement report in an RRC idle mode or an RRC inactive mode.

[0131] In the first embodiment, when the base station configures the frequency measurement configuration information for the UE to measure the frequency in the RRC idle mode or the RRC inactive mode, multiple frequency measurement groups can be configured through the RRCRelease message, and the UE can be configured to perform frequency measurement in the RRC idle mode or the RRC inactive mode.

[0132] The present invention describes an embodiment of configuring a frequency measurement list or a timer according to a frequency configuration group or radio access technology (or for each cell or for each beam) used when indicating frequency measurement configuration information in RRC inactive mode or RRC idle mode for a UE. In other words, a time period or timer value indicating the time when frequency measurement will be performed for LTE frequencies (for each frequency or for each cell) can be configured.

[0133] A time period or timer value indicating the time when frequency measurement will be performed for the NR frequency (for each frequency, for each cell, or for each beam) may also be configured. Accordingly, the present disclosure describes an embodiment in which a certain timer is configured for each frequency configuration group to set a certain time period. In other words, frequency measurement may be performed until a certain timer is driven and expires for each frequency group. When a certain timer is configured for each radio access technology, each cell, or each beam, different frequency measurement durations may be configured by reflecting frequency characteristics, beam characteristics, or cell characteristics, thereby optimizing the battery consumption of the UE.

[0134] According to the first embodiment, the UE capable of performing frequency measurement and sending a fast measurement report in the RRC idle mode or the RRC inactive mode may be a UE corresponding to one or more of the following cases.

[0135] In one example, all UEs capable of supporting fast frequency measurement and fast measurement reporting in RRC idle mode or RRC inactive mode.

[0136] In one example, when the base station causes the UE to transition from the RRC connected mode to the RRC idle mode or the RRC inactive mode, among the UEs in the RRC idle mode or the UEs in the RRC inactive mode, a UE that has received, through an RRC message, configuration information indicating that the UE measures a frequency in the RRC idle mode or the RRC inactive mode. For example, a UE that has received frequency configuration information of a frequency to be measured in the RRC idle mode or the RRC inactive mode or area configuration information (e.g., a cell identifier list) of an area to perform frequency measurement.

[0137] See also Figure 1F , a UE in RRC connected mode (operation 1f-05) may switch to RRC spatial mode or RRC inactive mode (operation 1f-15) due to a specific reason (for example, because there is no transmission or reception within a certain period of time). When the base station causes the UE's mode transition, the base station sends an RRC message (operation 1f-10). For example, an RRCRelease message (indicating a transition to RRC idle mode) or an RRCRelease message including suspend-config (indicating a transition to RRC inactive mode) may be sent. The RRC message may include the following multiple pieces of information to be applied when the UE performs early frequency measurement in RRC idle mode or RRC inactive mode, or some of the multiple pieces of information.

[0138] In one embodiment, for the frequency configuration information of the frequency measured in the RRC idle mode or the RRC inactive mode, the frequency configuration information includes an LTE frequency measurement information group or list (EUTRA frequency configuration information / list / group): the base station can include and configure the frequencies (e.g., frequency list) or frequency bands to be measured in the RRC message, the order of measuring priority frequencies, the filtering scheme used to measure the strength of the frequency during the frequency measurement process (e.g., L1 filtering, L2 filtering, L3 filtering, or coefficients and calculation schemes for frequency measurement), the event or condition on which the frequency measurement is started, the criterion for measuring the frequency and sending the measurement report compared with the current serving cell (or the currently residing frequency) (e.g., when the signal strength is equal to or greater than the indicated threshold), the event or condition on which the measurement report is sent, the criterion or condition that the reported frequency needs to meet compared with the current serving cell (or the currently residing frequency), and the time interval for sending the measurement report.

[0139] In this embodiment, the frequency configuration information includes an NR frequency measurement information group or list (NR frequency configuration information / list / group): the base station can include and configure the frequencies (e.g., frequency lists) or frequency bands to be measured in the RRC message, the order of priority SSB identifier information pieces or SSB transmission resources (frequency and time resources, beam identifiers or beam indicators) for measuring each frequency or priority frequency (or SSB), the filtering scheme used to measure the strength of the frequency during the frequency measurement process (e.g., L1 filtering, L2 filtering, L3 filtering, or coefficients and calculation schemes for measuring the frequency), the event or condition on which the frequency measurement is started, the criterion for measuring the frequency compared to the current serving cell (or the currently residing frequency) and sending the measurement report (e.g., when the signal strength is equal to or greater than the indicated threshold), the event or condition on which the measurement report is sent, the criterion or condition that the reported frequency needs to meet compared to the current serving cell (or the currently residing frequency), and the time interval for sending the measurement report.

[0140] In this embodiment, the base station can configure the duration of frequency measurement or the timer value (e.g., T331) for performing frequency measurement in RRC idle mode or RRC inactive mode, or can separately configure the timer for LTE frequency and the timer for NR frequency. Since the LTE frequency characteristics (low frequency band) and the NR frequency characteristics (high frequency band) are different, the frequency measurement time of the UE can be adjusted separately, thereby saving the battery of the UE. For example, when the RRCRelease message indicates frequency measurement in RRC idle mode or RRC inactive mode, the UE can start the timer and perform frequency measurement while the timer is working, and can stop the frequency measurement when the timer expires.

[0141] In this embodiment, when the base station indicates valid area information (e.g., a physical cell identifier (PCID) list) of a valid area for performing frequency measurement in RRC idle mode or RRC inactive mode, and the UE is within the cell indicated by the valid area information, the UE can perform frequency measurement. On the other hand, when the UE deviates from the area indicated by the valid area information, the UE can stop the frequency measurement. For example, when the UE deviates from the area indicated by the valid area information, the UE can stop the timer and terminate the frequency measurement. In another embodiment, the base station enables the UE switched to the RRC inactive mode to determine whether to use the RAN notification area as the valid area by using an indicator.

[0142] For example, when the base station instructs the UE to switch to RRC inactive mode to use the RAN notification area as the valid area through an indicator, the UE can perform frequency measurement in the RAN notification area while maintaining the RRC inactive mode. In another embodiment, the base station can instruct the UE to switch to RRC inactive mode to use the valid area as the RAN notification area through an indicator. In another embodiment, the UE can consider using the RAN notification area as the valid area in the RRC inactive mode without an indicator, and in the RRC idle mode, the base station can configure a separate valid area for the UE. Since the RRC message indicates both the RAN notification area and the valid area as a list of cell identifiers, the signaling overhead can be reduced according to the above embodiment. Since the valid area does not need to be managed separately during the implementation of the UE, the implementation load of the UE can be reduced.

[0143] In this embodiment, the base station may configure a measurement reporting threshold, and the UE may report a plurality of frequencies having signal strength greater than the measurement reporting threshold in the configured frequency group.

[0144] When the UE performs early frequency measurement in the RRC idle mode or the RRC inactive mode, the UE may start the early frequency measurement (operation 1f-30) when one of the following conditions is met.

[0145] In one example, when the RRCRelease message received by the UE includes an indicator indicating that frequency measurement is to be performed in RRC idle mode or RRC inactive mode, and the frequency information of the frequency to be measured and the frequency measurement duration (e.g., timer value) are configured, the UE can start the timer according to the frequency information and perform frequency measurement.

[0146] In one example, when the RRCRelease message received by the UE includes an indicator indicating that frequency measurement is performed in RRC idle mode or RRC inactive mode, and the frequency measurement duration (e.g., timer value) is configured but does not include frequency information of the frequency to be measured, the UE can first start the timer, and when the system information including the frequency information is broadcast, the frequency measurement can be performed according to the frequency information. When the UE moves to another cell and the system information of the new resident cell including new frequency information of the frequency to be measured in RRC idle mode or RRC inactive mode is broadcast, the UE can perform frequency measurement according to the new frequency information.

[0147] In other words, when the RRCRelease message does not configure frequency measurement configuration information about frequency measurement performed in RRC idle mode or RRC inactive mode and system information including frequency configuration information for frequency measurement in RRC idle mode or RRC inactive mode is broadcast, the UE can perform frequency measurement in RRC idle mode or RRC inactive mode based on the frequency configuration information. When the UE moves to a new cell and resides in the new cell, the UE can update the frequency measurement information using the frequency configuration information for frequency measurement in RRC idle mode or RRC inactive mode broadcast to the new cell, and can re-perform frequency measurement (operation 1f-12).

[0148] On the other hand, when the RRCRelease message configures frequency measurement configuration information about frequency measurement in RRC idle mode or RRC inactive mode, the UE may preferentially apply the frequency measurement configuration information configured in the RRCRelease message instead of the frequency configuration information for frequency measurement in RRC idle mode or RRC inactive mode included in the broadcast system information, and may perform frequency measurement. In other words, when the RRCRelease message configures frequency measurement configuration information about frequency measurement in RRC idle mode or RRC inactive mode, the UE may ignore or disregard the frequency configuration information included in the broadcast system information.

[0149] When the UE that has transitioned to the RRC idle mode or the RRC inactive mode needs to connect to the network due to special reasons, the UE performs a random access procedure and receives a random access response (operations 1f-20 and 1f-25).

[0150] According to one or more of the above conditions, the UE can start early frequency measurement. The UE can send message 3 (e.g., RRCSetupRequest or RRCresumeRequest message) to the base station while performing frequency measurement (operation 1f-35), and can receive message 4 (e.g., RRCSetup or RRCResume message) from the base station in response to message 3, thereby determining that the random access process is successful (operation 1f-40), and can switch to RRC connection mode (operation 1f-45).

[0151] Before the UE establishes a connection on the current cell, when the received system information (e.g., SIB2) (which includes an indicator indicating that frequency measurement in RRC idle mode or RRC inactive mode is supported or an indicator indicating that the results of frequency measurement in RRC idle mode or RRC inactive mode can be received) has been broadcast, the UE can notify the base station through an indicator included in message 5 (e.g., RRCSetupComplete or RRCResumeComplete message) that the UE has the results of frequency measurement performed in RRC idle mode or RRC inactive mode.

[0152] When the UE sends message 5 (e.g., RRC Setup Complete or RRC Resume Complete), the UE may send message 5, which includes an indicator indicating that early frequency measurement is performed in RRC idle mode or RRC inactive mode and that there is a measurement report to be sent. A new indicator may be defined as an indicator indicating the presence of a measurement report in message 5, and an indicator indicating the presence of UE information already defined in the RRC message (RRC Setup Complete or RRC Resume Complete) may be reused (operation 1f-50).

[0153] In another embodiment, an indicator indicating LTE frequency measurement support or NR frequency measurement support may be defined and used as an indicator in the system information. When message 5 indicates that there is a result of frequency measurement performed in RRC idle mode or RRC inactive mode, an indicator for measurement report relative to LTE frequency and an indicator for measurement report relative to NR frequency may be defined and used respectively.

[0154] When the base station confirms through the indication included in message 5 that early frequency measurement has been performed in RRC idle mode or RRC inactive mode, and there is a frequency measurement result to be reported, the base station may indicate to the UE a message to send a measurement report in order to receive a fast measurement report (operation 1f-55). For example, the base station may request information about the measurement report from the UE by newly defining and using UEinformationRequest as a DL-DCCH message. In response to this message, the UE may send a fast measurement report to the base station (operation 1f-65).

[0155] For example, in response to a DL-DCCH message, the UE may send a measurement report by newly defining and using a UEInformationResponse message as a UL-DCCH message. The measurement report may include, for example, a serving cell / frequency measurement result (e.g., NR-SS RSRP / RSRQ), a measurement result of a neighboring cell / frequency of the serving cell / frequency, a measurement result of a neighboring cell / frequency that the UE can measure, and a measurement result indicating a cell / frequency to be measured. In another embodiment, the base station may request information about the measurement report from the UE by defining an indicator in an RRCReconfiguration message.

[0156] In response to the RRCReconfiguration message, the UE may send a fast measurement report to the base station (operation 1f-65). For example, in response to the RRCReconfiguration message, the UE may report the measurement report via an RRCReconfigurationComplete message. In another embodiment, the UE may define a new field for reporting the measurement report in the UL-DCCH message, and may use the new field for reporting.

[0157] The UE may stop early frequency measurement in RRC idle mode or RRC inactive mode in the following cases.

[0158] In one example, when system information of the current cell supports fast measurement reporting and the UE sends information about the existence of a report about fast measurement reporting to the base station through an RRC message (e.g., message 5) or thereafter, when the UE configures a network connection while performing frequency measurement in RRC idle mode or RRC inactive mode and stops the timer and measurement in response to an RRCSetup message or an RRCResume message as message 4, the system information of the current cell supports fast measurement reporting, and the UE attempts to send information about the existence of a report about early frequency measurement results to the base station through an RRC message (e.g., message 5).

[0159] In one example, when a measurement report timer (eg, T331) expires.

[0160] In one example, when the UE deviates from the area indicated by the frequency measurement area information of the RRC idle mode or RRC inactive mode configured in the RRC Release message.

[0161] According to one or more of the above conditions, the UE may stop frequency measurement in the RRC idle mode or the RRC inactive mode (idle mode / inactive mode measurement) (operation 1f-60).

[0162] The UE performs measurement on the frequencies measurable by the UE in the information about the early frequency measurement configuration (ie, the frequencies supported by the information about the early frequency measurement configuration). In this case, the UE may select the frequency to be measured preferentially according to a preset priority.

[0163] The UE may operate as follows to send the measurement report according to the first embodiment of quickly performing frequency measurement and sending the measurement report in the RRC idle mode or the RRC inactive mode.

[0164] Upon receiving the RRCSetup message or the RRCResume message as message 4 from the base station, the UE may perform the following operations.

[0165] When system information (eg, SIB2) broadcasts or includes an indicator (IDLE or INACTIVE Mode Measurement) indicating support for frequency measurement in RRC idle mode or RRC inactive mode, the UE has the result of frequency measurement performed in the RRC idle mode or RRC inactive mode.

[0166] In one example, the UE includes an indicator (idle or INACTIVE Measavailable) indicating the result of the frequency measurement performed in the RRC idle mode or the RRC inactive mode in the RRCSetupComplete message or the RRCResumeComplete message as message 5. Accordingly, the UE can indicate, through message 5 including the indicator, that there is frequency measurement information about the frequency measurement in the RRC idle mode or the RRC inactive mode that needs to be reported to the base station.

[0167] In one example, since the UE may send a measurement report, the UE stops a timer (eg, T331) for frequency measurement in RRC idle mode or RRC inactive mode. The UE may stop the frequency measurement and may discard the frequency measurement configuration information.

[0168] Figure 1GThe procedure between the UE and the gNB is shown, where the UE performs early frequency measurements in RRC idle mode or RRC inactive mode and sends fast measurement reports.

[0169] Matters concerning the first embodiment are applicable to the second embodiment. In the second embodiment, when the base station configures the frequency measurement configuration information of the frequency to be measured by the UE in the RRC idle mode or the RRC inactive mode for the UE, the base station may configure multiple frequency measurement groups through the RRCRelease message, which may enable the UE to perform frequency measurement in the RRC idle mode or the RRC inactive mode, and the UE may indicate the presence of the result of the frequency measurement through the preamble of the random access process when configuring the network connection, indicate the measurement report through the random access response, and be configured to perform a fast measurement report through the message 3.

[0170] exist Figure 1G In the present invention, when a UE in an RRC connected mode receives frequency measurement configuration information and an indication of releasing the RRC connection and entering the RRC idle mode or the RRC inactive mode from a base station, the UE may perform frequency measurement in the RRC idle mode or the RRC inactive mode for a configured duration or time period. However, when the frequency measurement configuration information does not include information about a list of frequencies to be measured, and the frequency measurement configuration information for the UE to perform frequency measurement in the RRC idle mode or the RRC inactive mode is broadcast by the cell where the UE resides during the cell reselection process, the UE may receive the frequency measurement configuration information and may perform frequency measurement.

[0171] At this time, when the UE receives the RRC Release message and transitions to the RRC inactive mode, the UE may perform one of the following embodiments to process the Scells effectively configured for CA and the secondary cell group (SCG) effectively configured for DC.

[0172] In one embodiment 1, the configuration information of the SCell or the configuration information of the SCG can be completely released. When configuring the connection later, the base station can quickly configure the Scell ​​and SCG information about the CA for the UE by using the RRCResume message or the RRCReconfiguration message based on the fast measurement report. Embodiment 1 is advantageous in terms of storage because the configuration information of the SCell or the configuration information of the SCG does not need to be maintained, and because the base station does not need to retrieve the existing Scell ​​configuration information or the SCG configuration information from the source gNB, it is easy to implement.

[0173] In one embodiment, the configuration information about the SCell or the configuration information about the SCG may be stored, and the transmission or bearer configuration of the Scell ​​or SCG may be suspended. When configuring the connection later, the base station may restore the connection based on the fast measurement report by using the RRCResume message or the RRCReconfiguration message to reuse the information about the Scell ​​of the CA and the SCG of the DC for the UE, or may only update (incremental configuration) part of the configuration information, or may completely reconfigure the configuration information.

[0174] In this embodiment, since the UE maintains configuration information about the SCell or configuration information about the SCG, the base station can use the existing configuration information of the SCell or SCG without change, thereby reducing signaling overhead, and the UE can quickly apply and start CA or DC.

[0175] When it is necessary to configure an RRC connection with the network, the UE may indicate the presence of a measurement report performed in an RRC idle mode or an RRC inactive mode while configuring the RRC connection with the base station.

[0176] When the UE in the RRC idle mode or the RRC inactive mode reattempts to configure the network connection, when attempting to configure the currently connected cell to support the fast measurement report, the UE may indicate the information of the result of the frequency measurement through the preamble when performing random access (operation 1g-20). For example, the specific preamble may be configured to be used as an indicator in the system information. Alternatively, the specific preamble may be configured to indicate that many uplink transmission resources are required.

[0177] Alternatively, it may be promised that a specific preamble code is used as an indicator. When the base station recognizes the indicator, the base station may include an indicator indicating to send a measurement report in the random access response, and send a random access response including the indicator. In another embodiment, since the random access response sent by the base station may indicate an instruction to send a measurement report, the indicator may be omitted (operation 1g-25).

[0178] When the UE receives the uplink transmission resource from the random access response, the UE may send a measurement report together with message 3 (e.g., an RRCSetupRequest message or an RRCResumeRequest message). Thereafter, the UE may perform network connection configuration, and when the base station sends message 4 (e.g., an RRCSetup message or an RRCResume message) to the UE, the base station may send message 4 including CA configuration information or DC configuration information. Accordingly, the base station may quickly restore, change, or reconfigure CA or DC for the UE (operation 1g-40). Therefore, compared with the first embodiment, a fast measurement report may be sent.

[0179] The UE may stop fast measurement reporting in RRC idle mode or RRC inactive mode in the following circumstances: when the system information of the current cell supports fast measurement reporting and the UE sends information about the existence of a report on early frequency measurement results to the base station through a preamble during a random access procedure or thereafter; when performing frequency measurement in RRC idle mode or RRC inactive mode, the UE stops the timer and measurement when it receives an indication to send a measurement report through a random access response (PAR) in a random access procedure for configuring a network connection, the system information of the current cell supports fast measurement reporting, and the UE attempts to send a fast measurement report to the base station through an RRC message (e.g., message 3); the measurement report timer (e.g., T331) expires; the UE deviates from the area indicated by the area information for performing frequency measurement in RRC idle mode or RRC inactive mode configured in the RRClease message.

[0180] According to one or more of the above conditions, the UE may stop frequency measurement in the RRC idle mode or the RRC inactive mode (idle mode / inactive mode measurement) (operation 1g-60).

[0181] The UE performs measurement on the frequencies measurable by the UE in the information about the early frequency measurement configuration (ie, the frequencies supported by the information about the early frequency measurement configuration). In this case, the UE may select the frequency to be measured preferentially according to a preset priority.

[0182] The UE may operate as follows to send a measurement report according to the second embodiment of quickly performing frequency measurement and sending a fast measurement report in the RRC idle mode or the RRC inactive mode.

[0183] In one example, the UE may perform the following operations when receiving a random access response from the base station and attempting to send message 3. When system information (e.g., SIB2) broadcasts or includes an indicator (IDLE or INACTIVE Mode Measurement) indicating support for frequency measurement in RRC idle mode or RRC inactive mode, the UE has the result of frequency measurement performed in RRC idle mode or RRC inactive mode.

[0184] The UE includes a measurement report performed in the RRC idle mode or the RRC inactive mode in the message 3 (RRCSetupRequest message or RRCresumeRequest message), thereby configuring the message 3. In another embodiment, the RRC message (e.g., message 3) and the measurement report may be multiplexed and sent in the MAC layer. Accordingly, the UE may send a measurement report on the frequency measurement in the RRC idle mode or the RRC inactive mode to the base station through a corresponding message.

[0185] Since the UE can send a measurement report, the UE stops a timer (eg, T331) for frequency measurement in the RRC idle mode or the RRC inactive mode. The UE can stop the frequency measurement and can discard the frequency measurement configuration information.

[0186] Figure 1H A process between a UE and a gNB according to an embodiment of the present disclosure is shown, wherein the UE performs early frequency measurement and sends a fast measurement report in an RRC idle mode or an RRC inactive mode.

[0187] Matters concerning the first or second embodiment are applicable to the third embodiment. In the third embodiment, when the base station configures frequency measurement configuration information of the frequency to be measured by the UE in the RRC idle mode or the RRC inactive mode for the UE, the base station may configure multiple frequency measurement groups through an RRCRelease message, which may enable the UE to perform frequency measurement in the RRC idle mode or the RRC inactive mode, and the UE may indicate the existence of the frequency measurement result through message 3, indicate the measurement report through message 4 when configuring the network connection, and configure the sending of the measurement report through message 5.

[0188] Accordingly, compared with the first embodiment, a fast measurement report can be sent, and compared with the second embodiment, a measurement report can be sent with enhanced security because the UE in the RRC inactive mode activates the security algorithm with respect to SRB1 from the time point when the UE sends message 3. In other words, message 4 and message 5 can be encrypted as a new encryption key in the PDCP layer and integrity protected and sent.

[0189] An indicator indicating the presence of a result of performing frequency measurement in RRC idle mode or RRC inactive mode may be included in message 3 (e.g., RRCSetupRequest message or RRCresumeRequest message) to be sent after the terminal performs random access, and then sent. When the base station sends message 4 (e.g., RRCSetup message or RRCResume message) to the terminal, the base station may include an indicator instructing the terminal to send a measurement report in message 4, and send message 4 including this indicator. In another embodiment, since message 4 may indicate an instruction to send a measurement report, the indicator may be omitted. The terminal may send a measurement report via message 5 (e.g., RRCSetupComplete message or RRCResumeComplete message).

[0190] Since the terminal in the RRC inactive mode restores or activates the security procedure (encryption and decryption or integrity protection and verification) on the signaling radio bearer 1 (SRB1) when sending the RRCResumeRequest message, the terminal can strengthen security and receive message 4, and even when sending the measurement report through message 5, the terminal can strengthen security and send the measurement report. The base station can include CA configuration information or DC configuration information in the RRC message and send the RRC message using the measurement report. Accordingly, the base station can quickly restore, change or reconfigure CA or DC for the terminal.

[0191] exist Figure 1H In the present invention, when a UE in an RRC connected mode receives frequency measurement configuration information and an indication of releasing the RRC connection and entering the RRC idle mode or the RRC inactive mode from a base station, the UE may perform frequency measurement in the RRC idle mode or the RRC inactive mode for a configured duration or time period. However, when the frequency measurement configuration information does not include information about a list of frequencies to be measured, and the frequency measurement configuration information for the UE to perform frequency measurement in the RRC idle mode or the RRC inactive mode is broadcast by the cell where the UE resides during the cell reselection process, the UE may receive the frequency measurement configuration information and may perform frequency measurement.

[0192] At this time, when the UE receives the RRC Release message and switches to the RRC inactive mode, the UE may execute one of the following embodiments to process the Scell ​​effectively configured for CA and the SCG effectively configured for DC.

[0193] In one embodiment 1, the configuration information of the SCell or the configuration information of the SCG can be completely released. When configuring the connection later, the base station can quickly configure the Scell ​​and SCG information about the CA for the UE by using the RRCResume message or the RRCReconfiguration message based on the fast measurement report. Embodiment 1 is advantageous in terms of storage because the configuration information of the SCell or the configuration information of the SCG does not need to be maintained, and because the base station does not need to retrieve the existing Scell ​​configuration information or the SCG configuration information from the source gNB, it is easy to implement.

[0194] In one embodiment 2, the configuration information about the SCell or the configuration information about the SCG can be stored, and the transmission or bearer configuration of the Scell ​​or SCG can be suspended. When configuring the connection later, the base station can restore the connection based on the measurement report by using the RRCResume message or the RRCReconfiguration message to reuse the information about the Scell ​​of CA and the SCG of DC for the UE, or can only update (incremental configuration) part of the configuration information, or can completely reconfigure the configuration information. In this embodiment 2, since the UE maintains the configuration information about the SCell or the configuration information about the SCG, the base station can use the existing configuration information of the SCell or SCG without change, thereby reducing the signaling overhead, and the UE can quickly apply and start CA or DC.

[0195] When it is necessary to configure an RRC connection with the network, the UE may indicate the presence of a measurement report performed in an RRC idle mode or an RRC inactive mode while configuring the RRC connection with the base station.

[0196] When a UE in RRC idle mode or RRC inactive mode retrying to configure a network connection, when attempting to configure the currently connected cell to support fast measurement reporting, the UE may indicate the existence of information about frequency measurement results through message 3 (e.g., RRCSetupRequest message or RRCResumeRequest message) after performing random access (operation 1h-35). When the base station confirms the UE's indication, the base station may send message 4 (e.g., RRCSetup message or RRCResume message) including an indicator instructing the UE to send a measurement report. In another embodiment, since message 4 sent by the base station may indicate an instruction to send a measurement report, the indicator may be omitted (operation 1h-40).

[0197] In response to message 4, the UE may send a measurement report together with message 5 (e.g., RRCSetupComplete message or RRCresumeComplete message) (operation 1h-50). Thereafter, the UE may perform network connection configuration, and when the base station sends message 4 (e.g., RRCSetup message or RRCResume message) or RRCReconfiguration message to the UE, the base station may send message 4 including CA configuration information or DC configuration information. Accordingly, the base station may quickly recover, change, or reconfigure CA or DC for the UE.

[0198] The UE may stop early frequency measurement in RRC idle mode or RRC inactive mode in the following circumstances: when the system information of the current cell supports fast measurement reporting and when or after the UE sends information about the existence of fast measurement reporting to the base station through message 3; when performing frequency measurement in RRC idle mode or RRC inactive mode, the UE stops the timer and measurement when it receives an indication of a measurement report through message 4 during a random access procedure for configuring a network connection, the system information of the current cell supports fast measurement reporting, and the UE attempts to send information about the existence of a report on early frequency measurement results to the base station through an RRC message (e.g., message 3); the measurement report timer (e.g., T331) expires; and the UE deviates from the area indicated by the area information for performing frequency measurement in RRC idle mode or RRC inactive mode configured in the RRCRelease message.

[0199] According to one or more of the above conditions, the UE may stop frequency measurement in RRC idle mode or RRC inactive mode (idle mode / inactive mode measurement).

[0200] The UE performs measurement on the frequencies measurable by the UE in the information about the early frequency measurement configuration (ie, the frequencies supported by the information about the early frequency measurement configuration). In this case, the UE may select the frequency to be measured preferentially according to a preset priority.

[0201] The UE may operate as follows to send a measurement report according to the third embodiment of quickly performing frequency measurement and sending the measurement report in the RRC idle mode or the RRC inactive mode.

[0202] In one embodiment, when the UE receives a random access response and message 4 from the base station, the UE may perform the following operations.

[0203] When system information (eg, SIB2) broadcasts or includes an indicator (IDLE or INACTIVE Mode Measurement) indicating support for frequency measurement in RRC idle mode or RRC inactive mode, the UE has the result of frequency measurement performed in the RRC idle mode or RRC inactive mode.

[0204] The UE includes a measurement report performed in the RRC idle mode or the RRC inactive mode in the message 55 (RRCSetupRequest message or RRCResumeRequest message), thereby configuring the message 3. In another embodiment, the RRC message (e.g., message 5) and the measurement report may be multiplexed and sent in the MAC layer. Accordingly, the UE may send a measurement report in the RRC idle mode or the RRC inactive mode to be reported to the base station through a corresponding message.

[0205] Since the UE can send a measurement report, the UE stops a timer (eg, T331) for frequency measurement in the RRC idle mode or the RRC inactive mode. The UE can stop the frequency measurement and can discard the frequency measurement configuration information.

[0206] An efficient signaling scheme is described below for allowing a network or a base station to more efficiently configure or update frequency measurement configuration information for a terminal that is movable in an RRC inactive mode.

[0207] There are significant differences between a UE in RRC idle mode and a UE in RRC inactive mode in that: a UE in RRC inactive mode can configure a fast connection because the base station and the UE store the terminal context and reuse the terminal context when configuring a connection next time; and a UE in RRC inactive mode periodically updates the RAN notification area, thereby updating the area where the RRC inactive mode needs to be maintained from the network.

[0208] According to the present disclosure, when a UE in RRC connected mode receives frequency measurement configuration information and an indication of releasing the RRC connection and entering the RRC inactive mode from a base station, the UE may perform frequency measurement in the RRC inactive mode within a duration or time period configured in the frequency measurement configuration information. When the UE in the RRC inactive mode deviates from the configured RAN notification area while moving, the UE configures a network connection to perform an RNAU procedure. In one embodiment described in the present invention, in order to update the RAN notification area, the base station may configure, update or partially change new frequency measurement configuration information for the UE that has been connected to the network.

[0209] This disclosure describes in detail two processes for updating the RAN notification area.

[0210] Fig. 1I The process of updating the first RAN notification area according to an embodiment of the present disclosure is shown.

[0211] When a UE in RRC inactive mode deviates from the RAN notification area during mobility, the UE performs a random access procedure to perform a RAN notification area update procedure, and sends a message 3 (e.g., an RRCResumeRequest message) to the base station to perform network connection (operation 1i-20). The base station checks the connection resumption identifier of the UE included in message 3, and retrieves the UE context from the source gNB. The base station checks the connection resumption cause included in message 3, so that it can be determined that the UE needs to update the RAN notification area. To update the RAN notification area, the base station sends a message 4 (e.g., an RRCResume message) to the UE, causing the UE to transition to RRC connected mode (operations 1i-25 and 1i-30).

[0212] The UE indicates through message 5 that the connection has been correctly established (operation 1i-35). The base station includes the new RAN notification area in the RRCRelease message to update the RAN notification area, and sends the RRCRelease message including the new RAN notification area to the UE (operation 1i-40) to instruct the UE to switch back to the RRC inactive mode. In response to the RRCRelease message, the UE checks and reflects the new RAN notification area, thereby maintaining mobility and switching to the RRC inactive mode.

[0213] Figure 1J The process of updating the second RAN notification area according to an embodiment of the present disclosure is shown.

[0214] When the UE in the RRC inactive mode deviates from the RAN notification area during the movement process, the UE performs a random access procedure to perform the RAN notification area update procedure, and sends a message 3 (e.g., an RRCResumeRequest message) to the base station to perform network connection (operation 1j-20). The base station checks the connection resumption identifier of the UE included in the message 3, and retrieves the UE context from the source gNB. The base station checks the connection resumption cause included in the message 3, and can determine that the UE needs to update the RAN notification area.

[0215] The base station includes the new RAN notification area in the RRCRelease message to update the RAN notification area and sends the RRCRelease message including the new RAN notification area to the UE, and indicates that the UE needs to maintain the RRC inactive mode. In response to the RRCRelease message, the UE checks and reflects the new RAN notification area, thereby maintaining mobility and maintaining the RRC inactive mode (1j-40). Figure 1J The second RAN notification area update process is Fig. 1I Compared with the first RAN notification area update procedure in the RRC inactive mode, the signaling overhead can be reduced and the UE state transition is not required. In other words, the UE can perform the RAN notification area update procedure while maintaining the RRC inactive mode.

[0216] In the first RAN notification area update procedure or the second RAN notification area update procedure, the base station can retrieve the UE context from the source gNB through the connection resumption identifier indicated by the UE in message 3 (RRC Resume Request), and can determine whether the terminal is configured to perform frequency measurement in RRC inactive mode. The connection resumption cause included in message 3 can indicate that the connection is resumed to update the RAN notification area.

[0217] In another embodiment, when the UE sends message 3 to update the RAN notification area, the UE may include information that it has been configured to perform frequency measurement in the RRC inactive mode, or information that the T331 timer has expired or is running or that new frequency configuration information is required in the form of an indicator in message 3, and may send message 3 including this information to the base station. After the base station determines whether the UE can perform frequency measurement in the RRC inactive mode, when the base station sends an RRC message (e.g., an RRCRelease message) including information that the RAN notification area has been updated to the UE, the base station may include new frequency measurement configuration information in the RRC message and send an RRC message including this new frequency measurement configuration information (operations 1i-40 and 1j-40).

[0218] The new frequency measurement configuration information may include configuration information, such as a frequency list to be measured, a physical cell identifier list, a measurement duration, or a valid area (e.g., a cell identifier list) for which measurements are performed. Accordingly, when a UE in an RRC inactive mode passes through a coverage area supported by a base station or different cells during movement, the UE with mobility may quickly report the frequency measurement configuration information when configuring a network connection later, and may quickly configure DC or CA, while newly updating or changing the frequency measurement configuration information in the RRC inactive mode via a RAN notification area update procedure.

[0219] According to one embodiment of the present disclosure, a process is described, in which, when a base station or a cell connected to a UE supports frequency measurement in an RRC idle mode or an RRC inactive mode or system information indicates support for frequency measurement, after the UE sends a measurement report to the base station, the UE stops a timer (T331) to perform frequency measurement in an RRC idle mode or an RRC inactive mode, and discards or releases the frequency measurement configuration information or discards the measurement report.

[0220] According to the present disclosure, a UE in RRC inactive mode or RRC idle mode configures a certain area (e.g., a valid area) for performing frequency measurement through an RRCRelease message. In other words, the UE performs frequency measurement in RRC inactive mode or RRC idle mode only within the valid area, and when the valid area is exceeded, the UE can stop the timer, release the frequency measurement configuration information, discard the measurement report, or stop the frequency measurement. The valid area can be indicated as, for example, a physical cell identifier list or a RAN notification area indicator list.

[0221] The present disclosure describes an embodiment of separately configuring a valid area and a RAN notification area for a UE in an RRC inactive mode, and a solution for reducing UE burden and signaling overhead by enabling the UE in the RRC inactive mode to replace the RAN notification area with the valid area or vice versa (i.e., replace the valid area with the RAN notification area). When a valid area is indicated to the UE, in order to implement this UE, the tracking area needs to be maintained and updated, and the RAN notification area also needs to be maintained and updated, and the valid area also needs to be maintained and updated, thereby increasing overhead.

[0222] In other words, when the UE receives the RRCRelease message and receives information indicating that the UE needs to transition to the RRC inactive mode, when there is frequency measurement configuration information and there is an indicator or the use of the RAN notification area is indicated, the UE can transition to the RRC inactive mode and can perform frequency measurement by considering the RAN notification area as a valid area. In other words, when the UE receives the RRCRelease message and receives information indicating that the UE needs to transition to the RRC inactive mode, when there is frequency measurement configuration information and there is no indicator or the use of the RAN notification area is not indicated, or when a valid area has been configured and indicated, the UE can transition to the RRC inactive mode, can perform frequency measurement by considering the valid area, and can manage the mobility of the RRC inactive mode according to the RAN notification area.

[0223] The following describes the valid operations that a UE capable of or configured to perform frequency measurement in RRC inactive mode needs to perform in a first RAN notification area update procedure or a second RAN notification area update procedure: when the UE has sent message 3 to perform a first RAN notification area update procedure and has received an RRCRelease message in the first RAN notification area update procedure or the second RAN notification area update procedure; or when the UE receives an RCRRelease message.

[0224] In one example, when the UE receives the RRCRelease message, the RRCRelease message includes frequency measurement configuration information, and the frequency measurement configuration information includes frequency measurement duration information but does not include frequency measurement list information.

[0225] In this example, the UE configures the frequency measurement duration as a timer value and drives the timer.

[0226] In this example, the UE performs a frequency measurement process based on pre-stored information (information indicated by a previous RRCRelease message or information indicated by the last received system information). In another embodiment, the UE may determine that the pre-stored information is invalid information, discard the pre-stored information, perform a cell reselection process, and receive new frequency measurement information from the system information. When the UE has received the frequency measurement information and the frequency measurement has been stopped, the UE may resume the stopped frequency measurement. On the other hand, when the frequency measurement has never been stopped, the UE may newly start the frequency measurement.

[0227] When the UE receives a RRCRelease message, which includes frequency measurement configuration information, and the frequency measurement configuration information includes information about the frequency measurement duration and the frequency information of the frequency to be measured: the UE configures the frequency measurement duration as a timer value and drives the timer; the UE may determine the pre-stored information as invalid information, discard the pre-stored information, and may receive and store new frequency measurement information included in the RRCRRelease message and perform frequency measurement. When the frequency measurement has been stopped, the UE may resume the stopped frequency measurement. On the other hand, when the frequency measurement has never been stopped, the UE may newly start the frequency measurement.

[0228] When the UE has sent Message 3 and has received the RRCRelease message to perform the RAN notification area update procedure while performing frequency measurement in the RRC inactive mode, that is, when the RRC inactive mode is maintained without RRC mode transition and the UE has received the RRCRelease message in this state.

[0229] When the UE has sent message 3 and received the RRCRelease message to perform the RAN notification area update procedure while performing frequency measurement in the RRC inactive mode, and when the RRCRelease message does not include new frequency measurement configuration information, the UE continuously performs frequency measurement based on the existing frequency configuration information.

[0230] When the RRCRelease message includes new frequency measurement configuration information: the UE may discard or release the existing frequency measurement configuration information; and the UE configures the duration or timer value included in the new frequency measurement configuration information, thereby initializing the timer and re-driving the timer.

[0231] When the frequency measurement configuration information includes the frequency measurement list, the UE performs frequency measurement on frequencies included in the frequency measurement list.

[0232] When the frequency measurement configuration information does not include the frequency measurement list, the UE may perform a cell reselection procedure, and when the system information of the camped cell includes the frequency measurement information, may receive and store the frequency measurement information and perform frequency measurement.

[0233] In another embodiment, when the UE performs frequency measurement in RRC inactive mode while sending message 3 to perform the RAN notification area update process, the UE can stop the frequency measurement and receive the RRCRelease message, and when the RRCRelease message does not include new frequency measurement information, the existing frequency measurement information can be used to resume the frequency measurement. On the other hand, when the RRCRelease message includes new frequency measurement information, the UE can use the new frequency measurement information to resume the frequency measurement.

[0234] The following describes how to perform frequency measurement when a UE in RRC inactive mode has fallen back to RRC idle mode due to an instruction from a base station while attempting to resume network connection.

[0235] Figure 1K A process between a UE and a gNB according to an embodiment of the present disclosure is shown, wherein a UE in an RRC inactive mode falls back to an RRC idle mode due to an instruction from a base station when attempting to resume connection with a network.

[0236] In the present disclosure, a first embodiment of processing frequency measurement is provided when a UE in RRC inactive mode falls back to RRC idle mode due to an instruction of a base station while attempting to recover a network connection.

[0237] When the UE sends message 3 (operation 1k-20) and the base station sends the RRCSetup message as message 4 (operation 1k-40) to perform the RAN notification area update process while the UE performs frequency measurement in the RRC inactive mode, and therefore the UE needs to cancel the connection recovery process or transition from the RRC inactive mode to the RRC idle mode (operation 1k-45), the UE can stop the timer of the frequency measurement, discard the frequency measurement configuration information, and stop the frequency measurement. The UE can also discard the measurement report. In other words, when the UE in the RRC inactive mode is rolled back to the RRC idle mode, the UE discards and releases all existing preset information, thereby simplifying the implementation of the UE and the base station.

[0238] In the present disclosure, a second embodiment of processing frequency measurement is provided when a UE in RRC inactive mode falls back to RRC idle mode due to an instruction of a base station while attempting to recover a network connection.

[0239] When the UE sends message 3 (operation 1k-20) and the base station sends the RRCSetup message as message 4 (operation 1k-40) to perform the RAN notification area update process while the UE performs frequency measurement in the RRC inactive mode, so the UE needs to cancel the connection recovery process or transition from the RRC inactive mode to the RRC idle mode (operation 1k-45), the UE can indicate that there is a measurement report and can send the measurement report as described in the above embodiment. In other words, the UE can continue to make full use of the measurement report performed by the UE. The base station can determine whether the measurement report is valid. For example, the UE can perform the following operations.

[0240] When system information (e.g., SIB2) broadcasts or includes an indicator (IDLE or INACTIVE Mode Measurement) indicating support for frequency measurement in RRC idle mode or RRC inactive mode, and the UE has a result of frequency measurement performed in RRC idle mode or RRC inactive mode, the UE includes a frequency measurement indicator or measurement report in RRC idle mode or RRC inactive mode in message 5 (RRCSetupComplete message (operation 1k-50)) (when message 3 indicates that there is a frequency measurement result).

[0241] In another embodiment, when sending a measurement report, the RRC message (e.g., message 5) and the measurement report may be multiplexed and sent in the MAC layer. Accordingly, the UE may indicate through message 5 that there is frequency measurement information about frequency measurement in RRC idle mode or RRC inactive mode that needs to be reported to the base station, or report the measurement report through message 5.

[0242] Since the UE can report the measurement report, the UE stops the timer (eg, T331) for frequency measurement in the RRC idle mode or the RRC inactive mode. The UE can stop the frequency measurement and can discard the frequency measurement configuration information.

[0243] According to one embodiment, the frequency measurement configuration information may be configured as different information elements (IEs) for RRC idle mode and RRC inactive mode, respectively. In other words, the UE may indicate frequency measurement by including different frequency measurement configuration information according to the target RRC mode to which the UE switches. In addition, the UE may store measurement results performed in the RRC idle mode and the RRC inactive mode in different variables, and may send measurement reports differently. Since the RRC idle mode and the RRC inactive mode are different from each other in terms of network connection establishment procedures and detailed operations, it may be more efficient to separately manage configuration information (e.g., a frequency measurement list or a timer (duration) or a valid area) or configuration result report parameters.

[0244] Figure 1L A flowchart showing operations of performing frequency measurement and sending a measurement report in an RRC idle mode or an RRC inactive mode, performed by a UE according to an embodiment of the present disclosure.

[0245] See also Figure 1L In operation 11-05, in response to the RRC message, the UE drives a timer for frequency measurement in the RRC idle mode or the RRC inactive mode, and checks the frequency measurement configuration information for the frequency measurement in the RRC idle mode or the RRC inactive mode from the RRC message. In operation 11-10, when the frequency measurement configuration information exists, the UE performs frequency measurement in the RRC idle mode or the RRC inactive mode based on the frequency measurement configuration information.

[0246] When the frequency measurement configuration information is not included in the RRC message, the UE receives the frequency measurement information from the system information in operation 11-05, and may perform the frequency measurement in the RRC idle mode or the RRC inactive mode in operation 11-10. The UE in the RRC inactive mode may receive the RRC message even in the RAN notification area update process, and may configure new frequency measurement information in the RRC message each time the RAN notification area update process is performed so as to continue to perform the frequency measurement. In operation 11-15, when the UE performs the frequency measurement, the UE stores the result of the frequency measurement, and when the system information of the cell in which the network connection has been configured includes an indicator indicating that the system information supports frequency measurement in the RRC idle mode or the RRC inactive mode, and the network connection is configured, the UE receives message 4 and stops the timer.

[0247] The UE may notify the existence of the frequency measurement result in the RRC idle mode or the RRC inactive mode through message 5. In operation 11-20, when the base station requests the frequency measurement result in the RRC idle mode or the RRC inactive mode, the UE sends a measurement report in the RRC idle mode or the RRC inactive mode to the base station. When the measurement report in the RRC idle mode or the RRC inactive mode has been successfully transmitted to the base station, the UE discards the measurement report in the RRC idle mode or the RRC inactive mode.

[0248] Figure 1M The structure of a UE according to an embodiment of the present disclosure is shown.

[0249] See also Figure 1M , the UE includes a radio frequency (RF) processor 1m-10, a baseband processor 1m-20, a memory 1m-30 and a controller 1m-40.

[0250] The RF processor 1m-10 can perform functions for sending and receiving signals via a radio channel, such as frequency band conversion, amplification, etc. of the signals. In other words, the RF processor 1m-10 can up-convert the baseband signal provided from the baseband processor 1m-20 into an RF band signal and transmit the RF band signal through an antenna, and down-convert the RF band signal received through the antenna into a baseband signal. For example, the RF processor 1m-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). Although Figure 1M Only a single antenna is shown in FIG, but the UE may include multiple antennas.

[0251] The RF processor 1m-10 may include multiple RF chains. The RF processor 1m-10 may perform beamforming. For beamforming, the RF processor 1m-10 may adjust the phase and amplitude of a signal sent or received through multiple antennas or antenna elements. The RF processor 1m-10 may perform multiple-input multiple-output (MIMO) operations and may receive layers (or multiple layers of data) in MIMO operations. The RF processor 1m-10 may perform receive beam scanning by appropriately configuring multiple antennas or antenna elements, or may adjust the direction and beam width of the receive beam under the control of the controller 1m-40 so that the receive beam is coordinated with the transmit beam.

[0252] The baseband processor 1m-20 can perform conversion between baseband signals and bit streams based on the physical layer specifications of the system. For example, for data transmission, the baseband processor 1m-20 can generate composite symbols by encoding and modulating the transmitted bit stream. For data reception, the baseband processor 1m-20 can reconstruct the received bit stream by demodulating and decoding the baseband signal provided by the RF processor 1m-10.

[0253] For example, according to the OFDM scheme, for data transmission, the baseband processor 1m-20 can generate a complex symbol by encoding and modulating the transmission bit stream, mapping the complex symbol to a subcarrier, and then configuring the OFDM symbol by performing IFFT and CP insertion. For data reception, the baseband processor 1m-20 can split the baseband signal provided by the RF processor 1m-10 in units of OFDM symbols, reconstruct the signal mapped to the subcarrier by performing a fast Fourier transform (FFT), and then reconstruct the received bit stream by demodulating and decoding the signal.

[0254] The baseband processor 1m-20 and the RF processor 1m-10 send and receive signals as described above. Accordingly, each of the baseband processor 1m-20 and the RF processor 1m-10 may also be referred to as a transmitter, a receiver, a transceiver, or a transceiver. At least one of the baseband processor 1m-20 or the RF processor 1m-10 may include multiple communication modules to support a variety of different radio access technologies. In addition, at least one of the baseband processor 1m-20 or the RF processor 1m-10 may include multiple different communication modules to process signals of different frequency bands.

[0255] For example, different radio access technologies may include LTE networks, NR networks, etc. Different frequency bands may include super high frequency (SHF) (e.g., 2.5 GHz and 5 GHz) bands and millimeter wave (mmWave) (e.g., 60 GHz) bands. The UE may send or receive signals to or from a base station by using a baseband processor 1m-20 and an RF processor 1m-10. The signals may include control information and data.

[0256] The memory 1m-30 can store data used for UE operation, such as basic programs, applications, and configuration information. The memory 1m-30 can provide stored data according to the request of the controller 1m-40. The memory 1m-30 can be composed of a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk (CD)-ROM, a digital versatile disk (DVD), or a combination of storage media. The memory 1m-30 can be composed of multiple memories.

[0257] The controller 1m-40 controls the overall operation of the UE. For example, the controller 1m-40 can send and receive signals through the baseband processor 1m-20 and the RF processor 1m-10. In addition, the controller 1m-40 can write data to the memory 1m-30 and read data from the memory 1m-30. To this end, the controller 1m-40 may include at least one processor. For example, the controller 1m-40 may include a communication processor (CP) that performs communication control and an application processor (AP) that controls an upper layer such as an application. According to one embodiment, the controller 1m-40 may include a multi-connection processor 1m-42, which is configured to process processes operating in a multi-connection mode.

[0258] Figure 1N The structure of a transmission reception point (TRP) device in a mobile communication system according to an embodiment of the present disclosure is shown.

[0259] See also Figure 1N , the base station may include an RF processor 1n-10, a baseband processor 1n-20, a transceiver 1n-30, a memory 1n-40 and a controller 1n-50.

[0260] The RF processor 1n-10 may perform functions for transmitting and receiving signals via a radio channel, such as frequency band conversion, amplification, etc. of the signals. In other words, the RF processor 1n-10 may up-convert a baseband signal provided from the baseband processor 1n-20 into an RF band signal and transmit the RF band signal through an antenna, and down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processor 1n-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc.

[0261] although Figure 1N Only a single antenna is shown in the figure, but the first connection node may include multiple antennas. The RF processor 1n-10 may include multiple RF chains. The RF processor 1n-10 may perform beamforming. For beamforming, the RF processor 1n-10 may adjust the phase and amplitude of signals sent or received through multiple antennas or antenna elements. The RF processor 1n-10 may perform downlink (DL) MIMO operations by transmitting at least one layer.

[0262] The baseband processor 1n-20 can perform conversion between a baseband signal and a bit stream based on the physical layer specification of the first radio access technology. For example, for data transmission, the baseband processor 1n-20 can generate a composite symbol by encoding and modulating the transmitted bit stream. For data reception, the baseband processor 1n-20 can reconstruct the received bit stream by demodulating and decoding the baseband signal provided by the RF processor 1n-10. For example, according to the OFDM scheme, for data transmission, the baseband processor 1n-20 can generate a composite symbol by encoding and modulating the transmitted bit stream, mapping the composite symbol to a subcarrier, and then configuring the OFDM symbol by performing IFFT and CP insertion.

[0263] For data reception, the baseband processor 1n-20 may split the baseband signal provided by the RF processor 1n-10 into units of OFDM symbols, reconstruct the signal mapped to the subcarrier by performing FFT, and then reconstruct the received bit stream by demodulating and decoding the signal. The baseband processor 1n-20 and the RF processor 1n-10 transmit and receive signals as described above. Accordingly, each of the baseband processor 1n-20 and the RF processor 1n-10 may also be referred to as a transmitter, a receiver, a transceiver, or a wireless transceiver.

[0264] The transceiver 1n-30 may provide an interface for communicating with other nodes in the network. The base station may send or receive signals to or from the UE by using the baseband processor 1n-20 and the RF processor 1n-10. The signals may include control information and data.

[0265] The memory 1n-40 may store data used for the operation of the master base station, such as basic programs, applications, and configuration information. Specifically, the memory 1n-40 may store information about the bearers allocated to the connected UEs, measurement reports sent from the connected UEs, and the like. The memory 1n-40 may store standard information for determining whether to provide or release multiple connections to or from the UE. The memory 1n-40 may provide stored data upon request from the controller 1n-50. The memory 1n-40 may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. The memory 1n-40 may be composed of a plurality of memories.

[0266] The controller 1n-50 may control the overall operation of the base station. For example, the controller 1n-50 may send and receive signals through the baseband processor 1n-20 and the RF processor 1n-10, or through the transceiver 1n-30. In addition, the controller 1n-50 may write data to the memory 1n-40 and read data from the memory 1n-40. To this end, the controller 1n-50 may include at least one processor. According to one embodiment, the controller 1n-50 may include a multi-connection processor 1n-52, which is configured to process a process operating in a multi-connection mode.

[0267] The foregoing embodiments may be implemented in hardware, software, or a combination of hardware and software.

[0268] When implemented as software, a computer-readable storage medium storing one or more programs (e.g., software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be configured by one or more processors within an electronic device. One or more programs include instructions that instruct the electronic device to perform an embodiment of the present disclosure as described in the specification or the appended claims.

[0269] Programs (e.g., software modules or software) may be stored in non-volatile memory (including random access memory (RAM) or flash memory), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, compact disk (CD)-ROM, digital versatile disk (DVD), or other types of optical storage devices or tapes. Alternatively, the program may be stored in a memory that includes a combination of some or all of the above storage media. A plurality of such memories may be included.

[0270] In addition, the program can be stored in an attachable storage device that can be accessed through any network or network combination of communication networks such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), and a storage area network (SAN). Such storage devices can access the electronic device executing the embodiments of the present disclosure through an external port. In addition, a separate storage device on a communication network can access the electronic device executing the embodiments of the present disclosure.

[0271] In the above-mentioned embodiments of the present disclosure, the elements included in the present disclosure are expressed in singular or plural form according to the specific embodiments provided by the present disclosure. However, for ease of description, singular or plural expression is appropriately selected according to the presented situation, and the present disclosure is not limited to a single element or multiple elements. The elements described in plural form can be configured as a single element, and the elements described in singular form can be configured as multiple elements.

[0272] According to the disclosed embodiments, in a wireless communication system, a UE can quickly perform frequency measurement and send a measurement report.

[0273] The embodiments of the present disclosure disclosed in the specification and the drawings are only specific examples proposed for the convenience of illustrating the technical content of the present disclosure and promoting the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, other modifications based on the technical spirit of the present disclosure are obvious to those skilled in the art. In addition, the above-mentioned embodiments can be combined with each other when operation is required. For example, one embodiment of the present disclosure and part of another embodiment can be combined with each other, so that the base station and the UE can be operated. In addition, other modifications based on the technical spirit of the above-mentioned embodiments can be implemented in various systems such as FDD LTE systems, TDD LTE systems, and 5G or NR systems.

[0274] Although the present disclosure has been described with various embodiments, various changes and modifications may occur to those skilled in the art. The present disclosure is intended to encompass changes and modifications that fall within the scope of the appended claims.

Claims

1. A method for performing frequency measurement by a user equipment UE in a wireless communication system, the frequency measurement method include: receiving a first frequency measurement configuration from a base station; When in the RRC inactive state, sending an RRC recovery request message for RAN notification area RNA update to the base station; receiving an RRC release message from the base station in response to the RRC resume request message; as well as In case the RRC release message includes a second frequency measurement configuration, stopping a timer for the frequency measurement; releasing the first frequency measurement configuration; starting the timer with a value included in the second frequency measurement configuration; as well as Frequency measurement is performed based on the second frequency measurement configuration.

2. The method according to claim 1, wherein the frequency measurement is performed include: In case that the second frequency measurement configuration includes a frequency measurement list, the frequency measurement is performed based on the second frequency measurement configuration.

3. The method of claim 1, wherein the frequency measurement is performed include: In a case where the second frequency measurement configuration does not include a frequency measurement list and the system information of the camped cell includes a third frequency measurement configuration, the frequency measurement is performed based on the third frequency measurement configuration.

4. The method according to claim 1, further comprising: include: In case the RRC release message includes a suspension configuration, transitioning to the RRC inactive state.

5. The method of claim 2, wherein the frequency measurement list comprises at least one of an Evolved UMTS Terrestrial Radio Access (EUTRA) frequency measurement list or a New Radio (NR) frequency measurement list.

6. A user equipment UE for performing frequency measurement in a wireless communication system, the UE include: Transceiver; as well as A controller connected to the transceiver, the controller being configured to: receiving a first frequency measurement configuration from a base station, When in the RRC inactive state, sending an RRC recovery request message for RAN notification area RNA update to the base station, receiving an RRC release message from the base station in response to the RRC resume request message, and In case the RRC release message includes a second frequency measurement configuration, stopping a timer for the frequency measurement; releasing the first frequency measurement configuration; and Starting the timer with the value included in the second frequency measurement configuration Frequency measurement is performed based on the second frequency measurement configuration.

7. The UE according to claim 6, wherein the controller is configured to: In case that the second frequency measurement configuration includes a frequency measurement list, the frequency measurement is performed based on the second frequency measurement configuration.

8. The UE according to claim 7, wherein the controller is configured to: In a case where the second frequency measurement configuration does not include a frequency measurement list and the system information of the camped cell includes a third frequency measurement configuration, the frequency measurement is performed based on the third frequency measurement configuration.

9. The UE according to claim 6, wherein the controller is configured to: In case the RRC release message includes a suspension configuration, transitioning to the RRC inactive state.

10. The UE of claim 7, wherein the frequency measurement list comprises at least one of an Evolved UMTS Terrestrial Radio Access (EUTRA) frequency measurement list or a New Radio (NR) frequency measurement list.

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