Efficient MICO mode management method using network analysis information in 5G mobile network system

Abstract

A communication technology and system thereof that integrates a fifth generation (5G) or pre-5G communication system with IoT technology to support a higher data transmission rate after a fourth generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure can be applied to smart services based on 5G communication systems and IoT related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety related services, etc.). According to various embodiments, a device and method in a mobile communication system are provided for optimizing a mobile device initiated communication (MICO) mode related parameter value to reduce the power consumption of a terminal.

Description

Technical Field

[0001] The present disclosure relates to a device and method for improving efficiency by utilizing a network data analysis function when managing a mobile initiated communication only (MICO) function for reducing power consumption of a terminal in a 5G mobile network system. Background Art

[0002] In order to meet the increased demand for wireless data services after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop an improved 5G communication system or a pre-5G communication system. For this reason, the 5G communication system or the pre-5G communication system is referred to as a super 4G network communication system or a post-LTE system.

[0003] In order to achieve high data transmission rates, 5G communication systems are being considered for implementation in millimeter wave bands (e.g., 60 GHz bands). In 5G communication systems, technologies such as beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are being discussed as means to mitigate propagation path loss in ultra-high frequency bands and increase propagation transmission distances.

[0004] In addition, in order to improve the system network in the 5G communication system, technologies such as evolved small cells, advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), and reception interference cancellation technology have been developed.

[0005] In addition, 5G systems have developed advanced coding modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), and further developed advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA).

[0006] Meanwhile, the Internet has evolved from a human-oriented connection network, in which humans generate and consume information, to an Internet of Things (IoT) network, in which distributed components such as objects exchange and process information. Internet of Everything (IoE) technology has emerged, in which big data processing technology through connection with cloud servers, etc. is combined with IoT technology. In order to realize the Internet of Things, technical factors such as sensing technology, wired / wireless communication, network infrastructure, service interface technology, and security technology are required; and recently, research on technologies such as sensor networks for connection between objects, machine-to-machine (M2M) communication, machine type communication (MTC), etc. has been conducted. In the IoT environment, by collecting and analyzing data generated from connected objects, smart Internet technology (IT) services can be provided to create new value in human life. Through the integration of traditional information technology (IT) and various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars, connected cars, smart grids, health care, smart home appliances, and high-tech medical services.

[0007] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) are implemented through beamforming, MIMO, and array antenna schemes. The application of cloud RAN as a big data processing technology may be an example of the fusion of 5G communication technology and IoT technology.

[0008] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0009] Technical issues

[0010] Various embodiments suggest an apparatus and method in a 5G mobile network system, in which parameters used to manage the MICO mode are optimized and applied according to the situation of the terminal and the types of available services, taking into account the current network and service situation.

[0011] The technical subject matter pursued in the present disclosure may not be limited to the above-mentioned technical subject matter, and other technical subject matter not mentioned may be clearly understood by those skilled in the art in the field of the present disclosure through the following description.

[0012] Solution to the problem

[0013] According to some embodiments, a method in a 5G mobile network system includes: an operation of collecting network and service information from a network function (NF), an external server (AF and service server), a terminal, and a 5G network management system (operation, administration, and management (OAM)) through NEDAF; an operation of determining whether to use the MICO mode through a request of a terminal through AMF; an operation of requesting network analysis information from NWDAF to calculate MICO mode-related parameters through AMF; an operation of calculating MICO mode-related parameters through AMF; an operation of activating the MICO mode of the terminal by applying MICO mode-related parameters through AMF; and an operation of supporting the terminal to enter the MICO mode through the network.

[0014] Various embodiments include an apparatus and method in a mobile communication system for optimizing MICO mode related parameter values ​​to reduce power consumption of a terminal.

[0015] Various embodiments include a process and method for targeting optimal values ​​of MICO mode related parameters through the AMF based on various objects provided by the NWDAF using techniques such as artificial intelligence or machine learning.

[0016] According to an aspect of the present disclosure, a method for a first network entity of an access and mobility management function (AMF) is provided. The method includes: receiving a first message for requesting registration of a terminal from a terminal, the first message including information for indicating a preference for a mobile device initiated communication (MICO) mode only for the terminal; sending a second message for requesting analysis information about the terminal to a second network entity for a network data analysis function (NWDAF); receiving a third message from the second network entity, the third message including analysis information about the terminal; and determining whether the MICO mode is allowed for the terminal based on the analysis information about the terminal.

[0017] In one embodiment, the analysis information includes at least one of terminal communication analysis, terminal mobility analysis, and expected UE behavior parameters.

[0018] In one embodiment, the method further comprises: sending a fourth message to the terminal as a response to the first message, the fourth message comprising information indicating whether the MICO mode is allowed for the terminal.

[0019] In one embodiment, the method further comprises determining MICO mode parameters based on analysis information about the terminal.

[0020] In one embodiment, the MICO mode parameters include at least one of: information about an extended connection time for instructing the base station to keep the terminal in a radio resource connection (RRC) connection state, information about an active time for instructing the terminal to enter the MICO mode when the active time expires, or information about a periodic registration timer for the terminal to perform periodic registration.

[0021] In one embodiment, the second message further includes information about the terminal or the terminal group.

[0022] The present disclosure also provides a method for a first network entity of a network data analysis function (NWDAF). The method includes: receiving a first message for requesting analysis information about a terminal from a second network entity for an access and mobility management function (AMF); and sending a second message to the second network entity, the second message including the analysis information about the terminal.

[0023] In one embodiment, the first message further includes information about the terminal or the terminal group.

[0024] In one embodiment, the method also includes sending a third message to a third network entity, the third message being used to request a subscription to an event for the terminal to notify the occurrence of the event; receiving a fourth message from the third network entity, the fourth message including information associated with the event; determining analysis information about the terminal based on the fourth message; and sending a second message including the analysis information about the terminal to the second network entity.

[0025] The present disclosure also provides a first network entity for an access and mobility management function (AMF). The first network entity includes a transceiver and a controller, the controller being configured to receive a first message for requesting registration of the terminal from a terminal, the first message including information for indicating a preference for a mobile device initiated communication (MICO) mode only for the terminal; send a second message for requesting analysis information about the terminal to a second network entity for a network data analysis function (NWDAF); receive a third message from the second network entity, the third message including analysis information about the terminal; and determine whether the MICO mode is allowed for the terminal based on the analysis information about the terminal.

[0026] The present disclosure also provides a first network entity for a network data analysis function (NWDAF). The first network entity includes a transceiver and a controller, the controller being configured to receive a first message for requesting analysis information about a terminal from a second network entity for an access and mobility management function (AMF); and send a second message to the second network entity, the second message including the analysis information about the terminal.

[0027] Advantageous Effects of the Present Disclosure

[0028] The devices and methods according to various embodiments can minimize data loss and service quality degradation that may occur in the reception of services by adjusting a service cutoff period, which can be generated when a terminal using a 5G mobile network system uses a MICO mode and reduces power consumption in consideration of the services provided and the characteristics of the terminal.

[0029] According to the embodiment, the service quality degradation due to entering the MICO mode can be prevented, and the power consumption of the terminal can be significantly reduced.

[0030] Effects obtainable from the present disclosure may not be limited to the above-mentioned effects, and other effects that are not mentioned may be clearly understood by those skilled in the art of the present disclosure through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0032] Figure 1 shows a network structure and an interface in a wireless communication system according to various embodiments;

[0033] Figure 2 shows the relationship with other objects used to collect data in NWDAF according to an embodiment;

[0034] Figure 3 shows a process for supporting MICO mode by requesting external parameters that have not yet been delivered by AMF from NWDAF according to an embodiment;

[0035] Figure 4 shows a process for supporting MICO mode by requesting error analysis of external parameters delivered by AMF from NWDAF according to an embodiment;

[0036] Figure 5 shows a process of supporting MICO mode by requesting recommended values ​​for MICO mode related parameters that have not yet been delivered by AMF from NWDAF according to an embodiment; and

[0037] Figure 6 A diagram showing a configuration of a network entity according to an embodiment. DETAILED DESCRIPTION

[0038] Before proceeding to the following detailed description, it may be helpful to set forth definitions of certain words and phrases used throughout 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 therein, interconnected therewith, containing, contained therein, connected to or connected therewith, coupled to or coupled therewith, communicable therewith, cooperating therewith, intertwined therewith, juxtaposed therewith, adjacent to, bound therewith or with reference thereto, having, having the property of, etc.; and the term "controller" means any device, system, or portion thereof that controls at least one operation, such device may be implemented in hardware, firmware, or software, or some combination of at least two of them. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0039] 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 embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a portion thereof adapted to be implemented in a suitable computer-readable program code. 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 disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical or other communication links that transmit temporary electrical or other signals. Non-transitory computer-readable media include media in which data can be permanently stored and media in which data can be stored and subsequently overwritten, such as rewritable optical disks or erasable storage devices.

[0040] Definitions for certain words and phrases are provided throughout 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 such defined words and phrases.

[0041] The following discussion Figures 1 to 6 The various embodiments used to describe the principles of the present disclosure in this patent document are exemplary only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any suitably arranged system or device.

[0042] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0043] When describing the embodiments, descriptions of technologies that are already known to those skilled in the art and are not directly related to the present disclosure may be omitted. Such omissions of unnecessary descriptions are intended to prevent obscuring the gist of the present disclosure and to convey the gist more clearly.

[0044] For the same reason, in the accompanying drawings, some elements are enlarged, omitted or schematically shown. In addition, the size of each element does not fully reflect its actual size. In the accompanying drawings, the same or corresponding elements are provided with the same reference numerals.

[0045] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for realizing the advantages and features will be apparent. However, the present disclosure is not limited to the embodiments disclosed below, but can be implemented in various ways. The embodiments are provided to make the disclosure of the present disclosure complete, and to fully inform the technical personnel in the field to which the present disclosure belongs of the scope of the present disclosure. Throughout the specification, the same or similar reference numerals refer to the same or similar elements.

[0046] Here, it will be understood that each box of the flowchart diagram and the combination of boxes in the flowchart diagram can be executed by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for realizing the function specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable memory, and the instructions can direct the computer or other programmable data processing device to act in a particular way, so that the instructions stored in the computer-usable or computer-readable memory produce an article including an instruction device, which implements the function specified in one or more flowchart boxes. The computer program instructions can also be loaded on a computer or other programmable data processing device, so that a series of operation steps are performed on a computer or other programmable device to produce a computer-implemented process, so that the instructions of the execution computer or other programmable device provide steps for realizing the function specified in one or more flowchart boxes.

[0047] Furthermore, each block of the flowchart diagram may represent a module, a fragment or a portion of code, 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 indicated in the blocks may not occur in order. For example, depending on the functions involved, two blocks shown in succession may actually be executed substantially concurrently, or blocks may sometimes be executed in reverse order.

[0048] When used in this article, the term "unit" refers to a software element or a hardware element that performs a predefined function, such as a field programmable gate array (FPGA) or a dedicated integrated circuit (ASIC). A "unit" can be constructed as or stored on an addressable storage medium, or one or more processors are executed. Therefore, a "unit" includes, for example, a software element, an object-oriented software element, a class element or a task element, processing, a function, an attribute, a process, a subroutine, a program code fragment, a driver, a firmware, a microcode, a circuit, data, a database, a data structure, a table, an array, and a parameter. The element and function provided by a "unit" can be combined into a smaller number of elements, "units", or a larger number of elements, "units" can be divided. In addition, an element and a "unit" can be implemented as one or more CPUs in a reproduction (reproduce) device or a security multimedia card. In addition, in an embodiment, a "unit" can include one or more processors.

[0049] Although the main target is the wireless connection network new RAN (NR) on the 5G mobile communication standard recommended by 3GPP as a mobile communication standardization group, and the packet (pack) core (5G system, 5G core network or next generation (NG) core) of the core network in the detailed description of the embodiment, the main essence of the present disclosure can be applied to other communication systems with similar technical backgrounds with various modifications without greatly deviating from the scope of the present disclosure, and can be made possible by the determination of ordinary technicians in the field to which the present disclosure belongs.

[0050] In the following, for the convenience of description, the terms and names defined by the 3rd Generation Partnership Project (3GPP) Long Term Evolution standard (standard for 5G, NR, LTE or similar systems) may be partially used. However, the present disclosure may not be limited by the terms and names, and may be equally applied to a system based on another standard.

[0051] The terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are exemplified for the convenience of description. Therefore, the terms used in the present disclosure are not limited, and other terms referring to objects with equivalent technical meanings may be used.

[0052] The present disclosure relates to the following method: when the access and mobility function (AMF) that manages the access and mobility of the terminal to the 5G mobile communication network in the 5G mobile communication system activates the MICO mode that allows the terminal to only initiate communication first according to the request of the terminal, a method for optimizing relevant parameters by utilizing NWDAF.

[0053] The 5G mobile communication system defines a network data collection and analysis function (NWDAF), which provides a function of analyzing data collected by the 5G network and providing the collected data to support network automation. NWDAF can collect, store and analyze information from the 5G network to provide the results to a non-specific network function (NF), and the analysis results can be used independently by the NF. NWDAF can collect and analyze network information while using network slices as basic units. However, the scope of the present disclosure is not limited to network slice units, and NWDAF can additionally use various information such as user equipment (UE), PDU sessions, and NF status. The results analyzed by NWDAF are delivered to the NF requesting the results, and the delivered analysis results can be used to optimize network management functions such as security / enhancement of quality of service (QoS), traffic control, mobility management, and load distribution.

[0054] The entities appearing in the present disclosure may be described below.

[0055] Figure 1 A network structure and interfaces in a wireless communication system according to various embodiments are shown.

[0056] The unit that performs various functions provided by the 5G network system can be defined as a network function (NF). The structure of the 5G mobile communication network is as follows Figure 1 As shown. A representative NF includes: an access and mobility management function (AMF) 120 that manages network access and mobility of a user equipment (UE) 110; a session management function (SMF) 130 that performs session-related functions; a user plane function (UPF) 125 that serves as a delivery of user data; an application function (AF) 180 that communicates with the 5GC for provisioning; a network exposure function (NEF) 170 that supports communication between the 5GC and the AF 180; a unified data management (UDM) and a unified data repository (UDR) 160 for storing and managing data; a policy and control function (PCF) 150 for managing policies; and a data network (DN) 140, such as the Internet through which user data is delivered. In addition to the NF, there may also be operations, management, and administration (OAM) (not shown) as a system for managing terminals and 5G mobile communication networks.

[0057] There may be a network data analysis function (NWDAF) (not shown), which is a NF designed to collect and analyze data. The NWDAF serves to analyze information collected from the network or the outside, and provides the analysis results to the NF. The NWDAF can collect information from NFs or AFs constituting the OAM or 5G network. The NWDAF can collect information in various ways. A representative analysis function of the NWDAF is to collect and analyze the load level of a network slice instance, and provide the results to another NF to be used to select a specific UE 110 so that the specific UE 110 can be used. The service-based interface defined by the 5G network is used to request analysis information or deliver analysis results between a specific NF and the NWDAF.

[0058] In a 5G network, NWDAF may provide the following services, which provide the functions of collecting and analyzing information. Of course, the present disclosure is not limited to the following examples.

[0059] Nnwdaf_EventsSubscription service: The event subscription service is used for subscription and unsubscription of events generated by NWDAF, and the event subscription service can be classified as a method for receiving events periodically or when specific conditions are met. The event subscription service is called Nnwdaf_EventsSubscription. The Nnwdaf_EventsSubscription service provides three operations: subscription, unsubscription, and notification.

[0060] When a specific NF wants to subscribe (Nnwdaf_EventsSubscription_Subscribe), the parameters delivered by the specific NF through NWDAF can be classified into required input parameters and optional input parameters. According to some embodiments, the required input may include: S-NSSAI (Single Network Slice Selection Assistance Information), event identifier, notification target address, and event report information. Of course, the present disclosure is not limited to the examples. According to some embodiments, the optional input may include information additionally used to analyze information processing, and may representatively include event filter information. Of course, the present disclosure is not limited to the examples.

[0061] As a necessary input to Nnwdaf_EventsSubscription_Unsubscribe, the NF delivers the subscription identifier information to the NWDAF, and the NWDAF delivers the full text to the NF that requested the operation, which as an output notification has identified the release of the subscription.

[0062] For a specific event, when NWDAF meets periodic or specific conditions, Nnwdaf_EventsSubscription_NotifY will notify the result to the NF that has successfully subscribed to the specific event. The necessary input information of the notification operation may include an event identifier, a notification target address, an identifier of a network slice instance, and load level information of the network slice instance, and there may be no necessary output information. Of course, the present disclosure is not limited to the above examples.

[0063] Nnwdaf_Analytics_Info service: Different from the above event subscription service, the analysis request service may mean a service in which, after the NF requests analysis of specific information, the result value is delivered immediately after the request is completed. The supported operations of the analysis information request service include request and response. The NF requesting analysis information may send an analysis information request to the NWDAF.

[0064] Typically, NF sends the load level information of the network slice instance, analysis ID and additional parameters for analysis as necessary inputs of the analysis information request to NWDAF. Upon receiving the request from NF, NWDAF sends the analysis result to NF. The load information of the requested slice is sent in the response.

[0065] Although the analysis information provided by the services provided by NWDAF only considers the load information of the network slice instance according to the current Rel-15 definition of 3GPP, the information provided by NWDAF is not limited to the load information in the present disclosure.

[0066] The present disclosure includes an extension / modification of the above-mentioned interface of NWDAF, and includes the following method: for analyzing the UE behavior pattern and externally supplied parameters provided by AF and the network slice information between NWDAF and AMF, and inferring the non-existent information or calculating the error rate of the existing information through the data collected by NWDAF to provide the inferred information or error rate to AMF or another NF. In addition, NWDAF may include a method for providing the setting parameters for MICO mode as recommended values.

[0067] In the present disclosure, AMF includes an embodiment for calculating the following: periodic registration as a parameter related to the MICO mode that can be used to reduce the electric power of the terminal, the minimum reachability maintenance time before the initiation of the MICO mode, and the size and time of the buffer for the MICO mode. The present disclosure aims to prevent service quality degradation and maintain the power consumption of the terminal to be low by minimizing the value of the parameter according to the user usage pattern and service form of the terminal by utilizing NWDAF.

[0068] Whether the terminal can use the MICO mode in the existing 3GPP is determined by the AMF according to the internal policy of the service provider managing the 5G network. In order to allow the terminal that can use the MICO mode to activate the MICO mode, the MICO mode preference is sent together in the registration process, and the AMF that receives the MICO mode preference sends a MICO indication in the registration acceptance message. The terminal that is notified that the MICO mode can be initiated can initiate the MICO mode in the CM_IDLE state. The terminal can deliver the MICO mode preference in the initial registration and registration update process, and can deliver the MICO mode to the terminal through the registration acceptance message sent by the AMF and the setting configuration update process. Thereafter, the terminal notified by the AMF whether the MICO mode is possible initiates the MICO mode, and then, may not monitor all signals generated from the network. The terminal should wake up at the next periodic registration time point, and notify the AMF that the terminal is registered in the network through the registration update process. That is, the MICO mode initiation time point and the wake-up time point of the terminal are determined according to the registration update period. The present disclosure includes finding the optimal value between service quality degradation and data transmission according to the battery consumption and data loss of the terminal by adjusting the registration period of the terminal.

[0069] In MICO mode, there is no method that can deliver data to the terminal until the terminal wakes up again, because due to its characteristics, the terminal does not listen to all signals generated in the 5G network after initiating MICO mode. Therefore, when scheduling data to be delivered to the terminal from the outside in the near future, the accessibility of the terminal must be maintained. Here, accessibility refers to a state in which network services can be provided to the terminal through a call of AMF, and both CM_IDLE and CM_CONNECTED can correspond to accessibility. Currently, 3GPP has two methods for applying a minimum time period before the terminal initiates MICO mode, for which accessibility must be maintained. The first is a method that utilizes a connection time value referring to a minimum time period only when AMF maintains RAM in the RRC_CONNECTED state. The second is a method that utilizes an active timer that means a standby time period from the initiation of CM_IDLE mode to the initiation of MICO mode when the UE (terminal) is registered in the network. Both methods are methods for ensuring the accessibility of the terminal within a specific time period before the terminal initiates MICO mode. Therefore, it is necessary to enable the terminal to initiate the MICO mode as quickly as possible so that there is no data loss or delay by optimizing the period of time that the terminal waits before the MICO mode is initiated.

[0070] After the terminal initiates the MICO mode, no data can be delivered, and then the basic operation is to discard the data packets. However, if the number and size of the data packets to be received until the next wake-up of the terminal are known, the data can be transmitted without data loss by buffering the downstream data by SMF or UPF. It is necessary to determine whether the downstream data packets are at a level that can be buffered, and analyze the buffering time period and the size and number of the data to be buffered.

[0071] The AMF may utilize externally supplied parameters received from the AF to derive MICO mode related setting parameters. As communication mode parameters, representative external parameters include network configuration parameters, expected UE trajectories, and expected UE behavior patterns. In the present disclosure, external parameters are not explicitly defined as a set of specific parameters, but refer to parameters received from an external AF.

[0072] In order to determine the MICO mode related parameters, the current AMF performs its own calculation algorithm to determine the value through the data collected by itself and the external parameters received from the AF. Although the method for determining the value can vary according to the implementation of the AMF, the analysis data that can be collected by the AMF is limited according to the definition of the 3GPP standard, and it is therefore difficult to derive the optimal value.

[0073] The present disclosure includes a method for optimizing MICO mode related setting values, collecting and analyzing various data, and providing the analyzed data to AMF through a network, a terminal, an AF, and a network management system. NWDAF collects data from the above entities for data collection. Table 1 lists the data collected from 5GC NF. Table 2 lists the data collected by the terminal, AF, and network management system as external objects. The processing of the collected data is Figure 2 Shown in. Figure 2 FIG. 2 shows the relationship with other objects used to collect data in NWDAF according to an embodiment. Figure 2 , NWDAF 209 may receive subscription data and / or external parameters from UDM / UDR 208 (operation 220). NWDAF 209 may receive service data from AF 206 (via NEF 207) (operation 230). NWDAF 209 may receive session data from SMF 204 (operation 240). NWDAF 209 may receive access / mobility data from AMF 203 (operation 250). NWDAF 209 may receive UE analysis from UE 201 (via base station (NG-RAN) 202) (operation 260). NWDAF 209 may receive policy data from PCF 210 (operation 270). Figure 2The operations do not indicate the order in which they are generated, and the operations shown are not generated in the order shown. The analysis of the collected data and the prediction or analysis of the parameters used in the embodiments may vary depending on the algorithm and purpose.

[0074] [Table 1]

[0075]

[0076] Information collected by NWDAF from NF

[0077] [Table 2]

[0078]

[0079]

[0080] Information collected by NWDAF from external entities

[0081] [First embodiment]

[0082] In the present disclosure, when AMF receives a registration request including a MICO mode preference from a terminal, AMF calculates whether to accommodate the MICO mode of the terminal and the periodic registration timer value, and sends the result together with the registration update message. In addition, after CM_CONNECTED changes to CM_IDLE, the terminal does not immediately initiate the MICO mode, but AMF calculates the minimum time period required to maintain accessibility for a specific time period, and delivers the result to the UE or RAN. Then, the method for applying the communicative state to the maintenance time period follows the standards of 3GPP. Next, when SMF receives a signal indicating that downstream data arrives at the terminal in MICO mode, AMF notifies SMF that the terminal cannot be accessed at present, and notifies the buffering time and the size of the buffer. Then, the NF that performs buffering can be SMF or UPF, and operates according to the standards of 3GPP.

[0083] Figure 3 A process of supporting the MICO mode by requesting external parameters that have not been delivered by the AMF from the NWDAF according to an embodiment is shown.

[0084] Reference Figure 3 Let's discuss this embodiment.

[0085] In operation 320, NWDAF 309 collects the above data from NFs (303, 304, 308, 310, etc.), UE 301, AF 306, and OAM (not shown) and analyzes the data. The collection of data follows the procedure in the standard prescribed by 3GPP.

[0086] In operation 325, the terminal 301 performs a registration process, and when the terminal 301 can activate the MICO mode, writes the MICO mode preference in the registration message according to an internal decision.

[0087] In operation 330, the AMF 303 may collect subscription information, access information, mobility information management information, and information for registration of the terminal 301 from the PCF 310 and the UDM / UDR 308. The AMF 303 may bring external parameters stored in the UDM / UDR 308.

[0088] In operation 335, when requesting the MICO mode preference of the terminal 301 when performing the registration process, the AMF 303 detects the MICO mode indication, the parameters used to determine the relevant parameters, and the parameters not currently carried. Through the process specified by 3GPP, the AMF 303 can receive relevant external parameters and internal parameters from the AF 306 and the UDR / UDM 308 in advance.

[0089] In operation 340, the AMF 303 requests the inferred / predicted value of the external parameter not carried by the AMF 303 from the NWDAF 309. When requested, the AMF 303 sends an analysis request to the NWDAF 309, with the event ID and the target of the external parameter as parameters. The AMF 303 may additionally restrict the target to a specific terminal, a specific terminal group, a specific network slice, and a specific area, and send the restricted target.

[0090] In operation 345, the NWDAF 309 may calculate the analysis / prediction value of the parameter requested by the AMF 303 and return the calculated value to the AMF 303. The NWDAF 309 may send the accuracy or reliability of the result value together.

[0091] In operation 350 , the NWDAF 309 may (optionally) update the UDR / UDM 308 and, if the calculated result does not exist in the UDR / UDM 308 , allow the calculated result value to be used later.

[0092] In operation 355 , (optionally) if the calculated result is different from the value received from AF 306 , NWDAF 309 may send a notification through NEF 307 and deliver the information to AF 306 .

[0093] In operation 360, the AMF 303 determines a MICO mode indication, a periodic registration timer, a minimum reachable time, and a buffer size and time as MICO mode related parameters by using the received analyzed / predicted parameter values.

[0094] In operation 365, AMF 303 responds to terminal 301, including the MICO mode indication and the periodic registration timer in the registration accept message. When the minimum reachable time is managed by terminal 301 (for example, using an active timer), the minimum reachable time is delivered to terminal 301 together. When the minimum reachable time is managed by RAN 302 (for example, when a connected timer value is used), the minimum reachable time can be delivered to RAN 302 through the N2 interface.

[0095] In operation 370, the terminal 301 uses the 5GC service. Thereafter, in operation 375, the terminal 301 initiates the MICO mode after waiting for the minimum reachable time before initiating the MICO mode.

[0096] In operation 380 , downstream data from the outside 311 to the terminal 301 may be generated.

[0097] In operation 385, SMF 304 sends a call request to AMF 303.

[0098] In operation 390, after identifying that the terminal 301 has initiated the MICO mode, the AMF 303 determines the buffer size by predicting the time when the terminal 301 wakes up next time.

[0099] In operation 393, the AMF 303 transmits the determined buffer size in response to the SMF 304. The location at which packets are buffered follows the standard of 3GPP.

[0100] In operation 395, downstream packets of the terminal 301 in the MICO mode are buffered at a location where packets according to the 3GPP standard are buffered.

[0101] [Second embodiment]

[0102] The present disclosure is a method for identifying the health of the parameters received in the first embodiment when external parameters are received in advance from the AF or UDM / UDR. Due to the lack of a clear understanding of the communication mode of the service, the AF may set an arbitrary value or a value that is too large or too small. This is to prevent the MICO mode related parameters from being unable to be optimized due to operation. This embodiment can be used together with the first embodiment.

[0103] Figure 4 A process of supporting MICO mode by requesting error analysis of external parameters, which have been delivered by AMF from NWDAF, according to an embodiment is shown.

[0104] Reference Figure 4 Discuss this embodiment.

[0105] In operation 420, NWDAF 409 collects the above data from NFs (403, 404, 408, 410, etc.), UE 401, AF 406, and OAM (not shown) and analyzes the data. The collection of data follows the procedure in the standard prescribed by 3GPP.

[0106] In operation 425, the terminal 401 performs a registration process, and when the terminal 401 can activate the MICO mode, writes the MICO mode preference in the registration message according to an internal decision.

[0107] In operation 430, the AMF 403 may collect subscription information, access information, mobility information management information, and information for registration of the terminal 401 from the PCF 410 and the UDM / UDR 408. The AMF 403 may bring external parameters stored in the UDM / UDR 408.

[0108] In operation 435, when requesting the MICO mode preference of the terminal 401 when performing the registration process, the AMF 403 detects the MICO mode indication, the parameters used to determine the relevant parameters, and the parameters not currently carried. Through the process specified by 3GPP, the AMF 403 can receive relevant external parameters and internal parameters from the AF 406 and the UDR / UDM 408 in advance.

[0109] In operation 440, AMF 403 requests analysis values ​​from NWDAF 409 to identify errors of external parameters currently carried by AMF 303. When requested, AMF 403 sends an analysis request while taking the event ID and the target of the external parameter as parameters. AMF 303 may additionally limit the target to a specific terminal, a specific terminal group, a specific network slice, and a specific area, and send the limited target.

[0110] In operation 445, the NWDAF 409 may calculate the analysis / prediction value of the parameter requested by the AMF 403 and return the calculated value to the AMF 403. The NWDAF 409 may send the accuracy or reliability of the result value together.

[0111] In operation 450, (optionally) NWDAF 409 may update UDR / UDM 408 and allow the calculated value to be used later if the calculated result does not exist in UDR / UDM 408. UDR / UDM 408 may store both the value received from AF 406 and the analyzed value, or may express an error value for the received value.

[0112] In operation 455 , (optionally) if the calculated result is not received from the AF 406 , the NWDAF 409 may send a notification through the NEF 407 and deliver the information to the AF 406 .

[0113] In operation 460, the AMF 403 determines the MICO mode indication, the periodic registration timer, the minimum reachable time, and the buffer size and time as MICO mode related parameters by correcting the received analyzed / predicted parameter values.

[0114] In operation 465, AMF 403 responds to terminal 401, including the MICO mode indication and the periodic registration timer in the registration accept message. When the minimum reachable time is managed by terminal 401 (for example, using an active timer), the minimum reachable time is delivered to terminal 401 together. When the minimum reachable time is managed by RAN 402 (for example, when a connected timer value is used), the minimum reachable time can be delivered to RAN 402 through the N2 interface.

[0115] In operation 470, the terminal 401 uses the 5GC service. Thereafter, in operation 475, the terminal 401 initiates the MICO mode after waiting for the minimum reachable time before initiating the MICO mode.

[0116] In operation 480 , downstream data from the external 411 to the terminal 401 may be generated.

[0117] In operation 485, SMF 404 sends a call request to AMF 403.

[0118] In operation 490, after identifying that the terminal 401 has initiated the MICO mode, the AMF 403 determines the buffer size by predicting the time when the terminal 401 wakes up next time.

[0119] In operation 493, the AMF 403 transmits the determined buffer size in response to the SMF 404. The location at which the packets are buffered follows the standard of 3GPP.

[0120] In operation 495, downstream packets of the terminal 401 in the MICO mode are buffered at a location where packets according to the 3GPP standard are buffered.

[0121] [Third Embodiment]

[0122] The present disclosure is such a case where the AMF receives MICO mode indication, periodic registration timer, minimum reachable time, and buffer size and time as MICO mode related parameters from the NWDAF in the form of recommended values. The AMF serves to trust the determination of the MICO mode related parameters to the NWDAF or monitor the allowed range of the values.

[0123] Figure 5 A process of supporting the MICO mode by requesting recommended values ​​for MICO mode related parameters that have not yet been delivered by the AMF from the NWDAF according to an embodiment is shown.

[0124] Reference Figure 5 Discuss this embodiment.

[0125] In operation 520, the NWDAF 509 collects the above data from the NFs (503, 504, 508, 510, etc.), the UE 501, the AF 506, and the OAM (not shown) and analyzes the data. The collection of data follows the procedure in the standard prescribed by 3GPP.

[0126] In operation 525, the terminal 501 performs a registration process, and when the terminal 501 can activate the MICO mode, writes the MICO mode preference in a registration message.

[0127] In operation 530, the AMF 503 may collect subscription information, access information, mobility information management information, and information for registration of the terminal 501 from the PCF 510 and the UDM / UDR 508. The AMF 503 may bring external parameters stored in the UDM / UDR 508.

[0128] In operation 535, in case the MICO mode preference of the terminal 501 is requested when performing the registration procedure, the AMF 503 detects the need to determine the MICO mode indication and calculates related parameters.

[0129] In operation 540, the AMF 503 requests recommended values ​​of MICO mode related parameters from the NWDAF 509. When requested, the AMF 503 sends an analysis request while taking the event ID and the target of the external parameter as parameters. The AMF 503 may additionally limit the target to a specific terminal, a specific terminal group, a specific network slice, and a specific area, and send the restricted target. Then, the MICO mode related parameters are not limited to the MICO mode indication, the periodic registration timer, the minimum reachable time, and the buffer size and time.

[0130] In operation 545, the NWDAF 509 may calculate the analysis / prediction value of the parameter requested by the AMF 503 and return the calculated value to the AMF 503. The NWDAF 509 may send the accuracy or reliability of the result value together.

[0131] In operation 550, the AMF 503 reviews the received analyzed / predicted parameter values ​​and determines whether to apply the MICO mode indication, periodic registration timer, minimum reachable time, and buffer size and time, which are MICO mode related parameters, by using the received analyzed / predicted parameter values.

[0132] In operation 555, the AMF 503 responds to the terminal 501, including the MICO mode indication and the periodic registration timer in the registration accept message. When the minimum reachable time is managed by the terminal 501 (for example, using an active timer), the minimum reachable time is delivered to the terminal 501 together. When the minimum reachable time is managed by the RAN 502 (for example, when a connected timer value is used), the minimum reachable time can be delivered to the RAN 502 through the N2 interface.

[0133] In operation 560, the terminal 501 uses the 5GC service. Thereafter, in operation 565, the terminal 501 initiates the MICO mode after waiting for a minimum reachable time before initiating the MICO mode.

[0134] In operation 570 , downstream data from the external 511 to the terminal 501 may be generated.

[0135] In operation 575, SMF 504 sends a call request to AMF 503.

[0136] In operation 580 , after identifying that the terminal 501 has initiated the MICO mode, the AMF 503 determines the buffer size by predicting the time when the terminal 501 will wake up next time.

[0137] In operation 585, the AMF 503 transmits the determined buffer size in response to the SMF 504. The location at which the packets are buffered follows the standard of 3GPP.

[0138] In operation 590, downstream packets of the terminal 401 in the MICO mode are buffered at a location where packets according to the 3GPP standard are buffered.

[0139] The method in the 5G mobile network system according to the above embodiment includes: * an operation of collecting network and service information from a network function (NF), an external server (AF and service server), a terminal, and a 5G network management system (operation, administration and management (OAM)) through NEDAF; an operation of determining whether to use the MICO mode through a request of the terminal through AMF; an operation of requesting network analysis information from NWDAF through AMF to calculate MICO mode-related parameters; an operation of calculating MICO mode-related parameters through AMF; an operation of activating the terminal MICO mode by applying MICO mode-related parameters through AMF; and an operation of supporting the terminal to enter MICO mode through the network. According to various embodiments, a device and method in a mobile communication system may be provided for optimizing MICO mode-related parameter values ​​to reduce the power consumption of a terminal. Various embodiments may provide a process and method for searching for optimal values ​​for MICO mode-related parameters based on data collected by various objects provided by NWDAF and by using techniques such as artificial intelligence or machine learning.

[0140] Figure 6 A diagram showing a configuration of a network entity according to an embodiment.

[0141] The network entity according to the embodiment may include a transceiver 620 and a controller controlling the overall operation of the network entity. The transceiver 620 may include a transmitter 625 and a receiver 623.

[0142] Transceiver 620 may send and receive signals to and from other network entities.

[0143] The controller 610 can control the network entity to perform any operation of the above-mentioned embodiments. The controller 610 and the transceiver 620 do not have to be implemented as separate modules, and it is obvious that they can be implemented in a form such as a single chip through a configuration. The controller 610 and the transceiver 620 can be electrically connected to each other. For example, the controller 610 can be a circuit, a dedicated circuit or at least one processor. The operation of the network entity can be implemented by providing a storage device in the network entity that stores the corresponding program code in any configuration.

[0144] The network entities can be terminals, AMF, NWDAF, RN-RAN, SMF, UPF, AF, NEF, UDM / UDR, PCF and DN.

[0145] Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method performed by an access and mobility management function (AMF), the method comprising: receiving, from a terminal, a first message for requesting registration of the terminal, the first message including information for indicating a preference for a mobile device initiated only communication MICO mode; Sending a second message to the network data analysis function NWDAF, where the second message is used to request analysis information about the terminal; receiving a third message from the NWDAF as a response to the second message, the third message including analysis information about the terminal, the analysis information about the terminal including a first analysis about a communication mode parameter of the terminal and a second analysis about an expected terminal behavior parameter; as well as In case it is determined based on the information that the terminal allows the MICO mode, determining an active time of the MICO mode based on analysis information about the terminal and at least one parameter obtained from the unified data management (UDM), wherein a timer set to the active time is started when the terminal transitions from a connected state to an idle state, wherein the terminal enters the MICO mode based on expiration of the timer, and The analysis information about the terminal also includes the reliability of the first analysis and the second analysis.

2. The method according to claim 1, in, The second message includes first information about the terminal or terminal group, second information about the area associated with the first information, and third information about the network slice.

3. The method according to claim 1, further comprising: A fourth message is sent to the terminal as a response to the first message, the fourth message including information indicating that the MICO mode is allowed for the terminal and information about the activity time.

4. The method according to claim 3, in, The fourth message further includes at least one of: information about an extended connection time for instructing the base station to keep the terminal in a radio resource control RRC connected state, or information about a periodic registration timer for the terminal to perform periodic registration.

5. The method according to claim 1, in, The second message also includes an analysis identification ID for identifying the analysis information about the terminal requested by the AMF, and The analysis information about the terminal is inferred based on the event identifier ID associated with the analysis ID.

6. A method performed by a network data analysis function NWDAF, the method comprising: receiving a first message from an access and mobility management function AMF, the first message being used to request analysis information about a terminal; as well as sending a second message to the AMF as a response to the first message, wherein the second message includes analysis information about the terminal, The analysis information includes a first analysis on a terminal communication mode parameter, a second analysis on an expected terminal behavior parameter, and reliability of the first analysis and the second analysis, and wherein the activity time of the mobile device initiated communication MICO mode of the terminal is determined based on the analysis information about the terminal and at least one parameter obtained from the unified data management UDM, The active time is applied to a timer started when the terminal transitions from a connected state to an idle state, wherein the terminal enters the MICO mode based on expiration of the timer.

7. The method according to claim 6, in, The first message includes first information about a terminal or a terminal group, second information about an area associated with the first information, third information about a network slice, and an analysis identification ID for identifying analysis information about the terminal requested by the AMF, and The analysis information about the terminal is inferred based on the event identifier ID associated with the analysis ID.

8. The method according to claim 6, wherein: Sending the second message includes: Sending a third message to another network entity, where the third message is used to request to subscribe to an event for the terminal to notify the occurrence of the event; receiving a fourth message from the other network entity, the fourth message comprising information associated with the event; Based on the fourth message, determining analysis information about the terminal; and A second message including analysis information about the terminal is sent to the AMF.

9. An access and mobility management function AMF, the AMF comprising: Transceiver; and A controller; wherein the controller is configured to: receiving, from a terminal, a first message for requesting registration of the terminal, the first message including information for indicating a preference for a mobile device initiated only communication MICO mode; Sending a second message to the network data analysis function NWDAF, where the second message is used to request analysis information about the terminal; receiving a third message from the NWDAF as a response to the second message, the third message including analysis information about the terminal, the analysis information about the terminal including a first analysis about a communication mode parameter of the terminal and a second analysis about an expected terminal behavior parameter; as well as In case it is determined based on the information that the terminal allows the MICO mode, determining an active time of the MICO mode based on analysis information about the terminal and at least one parameter obtained from the unified data management (UDM), wherein a timer set to the active time is started when the terminal transitions from a connected state to an idle state, wherein the terminal enters the MICO mode based on expiration of the timer, and The analysis information about the terminal also includes the reliability of the first analysis and the second analysis.

10. The AMF according to claim 9, in, The second message includes first information about the terminal or terminal group, second information about the area associated with the first information, and third information about the network slice.

11. The AMF according to claim 9, wherein: The controller is also configured to: A fourth message is sent to the terminal as a response to the first message, the fourth message including information indicating that the MICO mode is allowed for the terminal and information about the activity time.

12. The AMF according to claim 11, in, The fourth message further includes at least one of: information about an extended connection time for instructing the base station to keep the terminal in a radio resource control RRC connected state, or information about a periodic registration timer for the terminal to perform periodic registration.

13. The AMF according to claim 9, in, The second message also includes an analysis identification ID for identifying the analysis information about the terminal requested by the AMF, and The analysis information about the terminal is inferred based on the event identifier ID associated with the analysis ID.

14. A network data analysis function NWDAF, the NWDAF comprising: Transceiver; and A controller, the controller being configured to: receiving a first message from an access and mobility management function AMF, the first message being used to request analysis information about a terminal; as well as sending a second message to the AMF as a response to the first message, wherein the second message includes analysis information about the terminal, The analysis information includes a first analysis on a terminal communication mode parameter, a second analysis on an expected terminal behavior parameter, and reliability of the first analysis and the second analysis, and wherein the activity time of the mobile device initiated communication MICO mode of the terminal is determined based on the analysis information about the terminal and at least one parameter obtained from the unified data management UDM, The active time is applied to a timer started when the terminal transitions from a connected state to an idle state, wherein the terminal enters the MICO mode based on expiration of the timer.

15. The NWDAF according to claim 14, in, The first message includes first information about a terminal or a terminal group, second information about an area associated with the first information, and third information about a network slice, and Wherein, the controller is further configured as: sending a third message to another network entity, wherein the third message is used to request to subscribe to an event for the terminal to notify the occurrence of the event, receiving a fourth message from the other network entity, the fourth message comprising information associated with the event, Based on the fourth message, determining analysis information about the terminal; and A second message including analysis information about the terminal is sent to the AMF.

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