KR102296080B1 - Method of Service Recovery Upon Occurrence of a Failure on a 5G SA Core Network - Google Patents

Abstract

Provided is a service recovery method on the occurrence of a failure on a fifth generation (5G) standalone access (SA) core network. The service recovery method of the present invention comprises the following steps of: allowing a user data management device to sense the presence of a failure in the 5G SA core network device; allowing the user data management device to send a first network re-registration guide message to a core access and mobility management device, wherein the first network re-registration guide message guides re-registration to the 5G non-standalone access (NSA) network; and allows the core access and mobility management device to send a second re-registration guide message through a 5G base station to at least one 5G terminal linked to the 5G SA core network device having the failure, wherein the second network re-registration guide message is a message which guides re-registration to the 5G NSA network. In accordance with the present invention, when a failure occurs in the 5G SA core network, the 5G NSA core network is used to stably provide 5G service.

Description

Method of Service Recovery Upon Occurrence of a Failure on a 5G SA Core Network

The present invention relates to mobile communication technology.

Recently, 5G (5th Generation) communication technology, which is a 5th generation technology standard for a cellular communication network, has become a hot topic in the communication industry. With 2019 as the first year, many telecommunication companies in many countries are deploying and commercializing 5G communication systems. The 5G communication system provides communication services by dividing the service area into small geographic areas called 'cells', like its predecessor, the 4G communication system. to the Internet and telephone networks. The advantage of the 5G network is that it provides a high download speed of up to 10 gigabits per second (gigabits) because the bandwidth is wider than that of the 4G network. Based on this increased download speed, 5G networks are designed to connect anyone and anything together, regardless of people, machines, things and devices. 5G communication networks are also expected to create many applications in the Internet of Things (IoT) and Machine to Machine (M2M) areas.

The 5G communication network is classified into a 5G NSA (Non-standalone) network and a 5G SA (Standalone) network. The 5G NSA network utilizes the 4G core network, not the self-established core network. The 4G base station is responsible for functions belonging to the control plane such as signaling, and functions belonging to the user plane such as data traffic transmission are It is structured to be processed by the 5G base station. The 5G SA network has a structure in which functions belonging to the control plane, such as signaling, and functions belonging to the user plane, such as data traffic transmission, are handled by its own equipment. Among the 5G SA standard and the 5G NSA standard, the 5G NSA standard was distributed first, and for this reason, the 5G communication system was commercialized as the first NSA standard in Korea. In the case of the 5G communication network according to the NSA standard, equipment investment has already been completed to provide services, and since the existing 4G core network that has been providing commercial services for a long time is upgraded and used as the NSA core network, stable operation is expected in the future. On the other hand, in the case of 5G SA network, it is very important to secure stability in initial service provision because a new core network must be built and new standard-based equipment must be introduced.

An object of the present invention is to provide a technology for stably providing a 5G service using a 5G NSA core network when a 5G SA core network failure occurs.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In one aspect, there is provided a method of performing service recovery in case of a 5th generation (5G) standalone (SA) core network failure. The method includes the steps of detecting, in a user data management device, that there is a failure in a 5G SA core network device, and transmitting a first network re-registration induction message from the user data management device to a core access and mobility management device - The first network reconnection inducing message is a message inducing reconnection to the 5G NSA network - and at least one linked to the 5G SA core network device with the failure through the 5G base station in the core access and mobility management device The step of transmitting a second network reconnection inducing message to the 5G terminal, wherein the second network reconnection inducing message is a message inducing reconnection to the 5G NSA network, may include.

In an embodiment, the user data management apparatus is User Data Management (UDM) defined in 3rd Generation Partnership Project (3GPP).

In an embodiment, the core access and mobility management device is an AMF (Core Access and Mobility Management Function) defined in 3GPP.

In one embodiment, the 5G SA core network device includes a session management device.

In an embodiment, the session management device is a Session Management Function (SMF) defined in 3GPP.

In one embodiment, the step of detecting that there is a failure in the 5G SA core network device in the user data management device includes receiving a message informing that the session management device has a failure from the session management device in the user data management device. and detecting that there is a failure in the session management device.

In an embodiment, the step of detecting that there is a failure in the 5G SA core network device in the user data management device may include detecting that the interworking between the user data management device and the session management device is disconnected by the user data management device. and detecting that there is a failure in the management device.

In one embodiment, the step of detecting that there is a failure in the 5G SA core network device in the user data management device includes a message notifying that there is a failure in the session management device from the 5G core network monitor and companion device in the user data management device and detecting that there is a failure in the session management device by receiving.

In one embodiment, the 5G core network monitor and companion device is a Network Repository Function (NRF) defined in 3GPP.

In one embodiment, the step of detecting that there is a failure in the 5G SA core network device in the user data management device includes a flag indicating that the session management device has a failure in the user data management device by a network operator ( flag) is set, thereby detecting that there is a failure in the session management device.

In one embodiment, the method includes the steps of transmitting a second network reconnection induction message from the core access and mobility management device to at least one 5G terminal linked to the 5G SA core network device with the failure through a 5G base station - The second network reconnection inducing message is a message for inducing reconnection to the 5G NSA network - Previously, the 5G SA core network as a mobility management device in charge of a non-standalone (NSA) service in the core access and mobility management device The method further includes transmitting a message indicating that there is a failure in the device.

In an embodiment, the mobility management device in charge of the Non-standalone (NSA) service is a Mobility Management Entity (MME) defined in 3GPP.

In an embodiment, the method further includes receiving a first access request message from the at least one 5G terminal through a 4G base station in the mobility management device in charge of the NSA service. Here, the first access request message is a message requesting access to the 5G NSA network.

In an embodiment, the method further comprises transmitting a second access request message from the mobility management device in charge of the NSA service to the gateway device in charge of the NSA service. Here, the second access request message is a message requesting access to the 5G NSA network.

In one embodiment, the method transmits a second connection request message to the gateway device in charge of the NSA service in response to confirming that there is a failure in the 5G SA core network device in the mobility management device in charge of the NSA service further steps. Here, the second access request message is a message requesting access to the 5G NSA network.

In an embodiment, the gateway device in charge of the NSA service includes a Serving Gateway (SGW) and a Packet Data Network Gateway (PGW) defined in 3GPP.

In one embodiment, the method includes the steps of transmitting a second network reconnection induction message from the core access and mobility management device to at least one 5G terminal linked to the 5G SA core network device with the failure through a 5G base station - The second network reconnection inducing message is a message inducing reconnection to the 5G NSA network - Afterwards, the core access and mobility management device is a mobility management device in charge of NSA service, indicating that there is a failure in the 5G SA core network device It further includes the step of forwarding the informing message.

In an embodiment, the method further includes receiving a first access request message from the at least one 5G terminal through a 4G base station in the mobility management device in charge of the NSA service. Here, the first access request message is a message requesting access to the 5G NSA network.

In an embodiment, the method further comprises transmitting a second access request message from the mobility management device in charge of the NSA service to the gateway device in charge of the NSA service. Here, the second access request message is a message requesting access to the 5G NSA network.

In another aspect, there is provided a method for performing service recovery when a failure of the session management device in the user data management device occurs. The method includes the steps of detecting that there is a failure in the session management device, and controlling the transmission of a network reconnection inducement message to at least one 5G terminal connected to the 5G SA network through the core access and mobility management device and the 5G base station. - The network reconnection inducing message is a message inducing reconnection to the 5G NSA network - may include.

In one embodiment, the user data management device is a UDM defined in 3GPP.

In one embodiment, the session management device is an SMF defined in 3GPP.

In one embodiment, the core access and mobility management device is an AMF defined in 3GPP.

In one embodiment, the step of detecting that there is a failure in the session management apparatus includes detecting that there is a failure in the session management apparatus by receiving a message from the session management apparatus notifying that there is a failure in the session management apparatus. .

In an embodiment, detecting that there is a failure in the session management apparatus includes detecting that there is a failure in the session management apparatus by detecting that interworking between the user data management apparatus and the session management apparatus is disconnected.

In one embodiment, the step of detecting that there is a failure in the session management device includes: detecting that there is a failure in the session management device by receiving a message indicating that there is a failure in the session management device from a 5G core network monitor and a companion device includes

In one embodiment, the 5G core network monitor and companion device is an NRF defined in 3GPP.

In an embodiment, the step of detecting that there is a failure in the session management device may include setting a flag indicating that the session management device has a failure in the user data management device by a network operator, thereby detecting that there is a failure in the session management device. including the steps of

According to the embodiments of the present invention, there is a technical effect of stably providing a 5G service using the 5G NSA core network when a failure of the 5G SA core network occurs.

1 is a diagram illustrating an embodiment of a network environment including a 5th generation (5G) non-standalone (NSA) network and a 5G standalone (SA) network in which a method according to the disclosed technology is performed.
2 is a diagram illustrating an embodiment of a flowchart for explaining a method of performing service recovery in the event of a 5G SA core network failure.

Advantages and features of the present invention and a method of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and these embodiments merely allow the disclosure of the present invention to be complete and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

The terms used herein are used only to describe specific embodiments and are not intended to limit the present invention. For example, a component expressed in a singular should be understood as a concept including a plurality of components unless the context clearly means only the singular. In addition, in the specification of the present invention, terms such as 'comprise' or 'have' are only intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and such The use of the term does not exclude the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof. Also, in the embodiments described in this specification, a 'module' or a 'unit' may mean a functional part that performs at least one function or operation.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the specification of the present invention, it should be interpreted in an ideal or excessively formal meaning. doesn't happen

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, in the following description, if there is a risk of unnecessarily obscuring the gist of the present invention, detailed descriptions of well-known functions or configurations will be omitted.

1 is a diagram illustrating an embodiment of a network environment including a 5th generation (5G) non-standalone (NSA) network and a 5G standalone (SA) network in which a method according to the disclosed technology is performed. It should be recognized that the 5G NSA network and the 5G SA network shown in FIG. 1 do not include all the components of the 5G NSA network and the 5G SA network currently in commercial use, and therefore may include more components than the illustrated components. .

As shown in FIG. 1 , the 5G SA network 152 may include a 5G SA base station 112 such as a gNB and a 5G SA core network. The 5G SA network 152 has a structure in which functions belonging to a control plane such as signaling and functions belonging to a user plane such as data traffic transmission are processed by its own equipment. 5G SA core network may include AMF (Core Access and Mobility Management Function, 114) and SMF (Session Management Function, 116). The AMF 114 and the SMF 116 perform functions belonging to the control plane in the 5G SA core network. The AMF 114 provides, for example, a function for access and mobility management in units of a terminal (UE, 107), which may be a 5G SA terminal, and one terminal 107 may be basically connected to one AMF 114. have. AMF 114 also provides signaling between core network devices for mobility between 3rd Generation Partnership Project (3GPP) access networks, and termination for a Radio Access Network (RAN) CP interface, terminal 107. and functions such as delivery and provision of session management messages between the SMF 116 and the SMF 116 . The SMF 116 provides a session management (SM) function and an IP address assignment and management function of the terminal 107 . When the terminal has a plurality of sessions, each session may be managed by a different SMF. The 5G SA core network may further include a User Data Management (UDM) 135 interworking with the AMF 114 and the SMF 116 . The UDM 135 may function to store subscriber profile information such as subscriber authentication information and additional service information, and policy data such as whether incoming and outgoing voice, text, and data are possible. According to the disclosed technology, the UDM 135 may be configured to detect that there is a failure in the 5G SA core network device, such as the AMF 114 , the SMF 116 . In an embodiment, the UDM 135 may be configured as one unit with a Home Subscriber Server (HSS), which is a 5G NSA core network device to be described later as shown. In one embodiment, the UDM 135 may be configured as an independent unit separate from the HSS. The 5G SA core network may further include a Network Repository Function (NRF) 118, which is a 5G SA core network information storage and 5G SA core network monitor and interworking device. The NRF 118 may be operated to interwork with 5G SA core network devices including the AMF 114 and the SMF 116 . The NRF 118 supports interworking between 5G core network devices by monitoring the service status of the dynamically changed 5G SA core network and performing message routing processing between 5G core network devices and interworking information management between them.

Continuing to refer to FIG. 1 , the 5G NSA network 154 may include a 4G (LTE) base station 122 such as an eNB, a 5G SA base station 112 and a 4G core network. The 5G NSA network 154 utilizes a 4G core network, not a self-established core network, and the 4G base station 122 is responsible for functions belonging to the control plane such as signaling, and functions belonging to the user plane such as data traffic transmission are performed by the 5G base station It has a structure processed by (112). In one embodiment, the 4G core network is a 4G core network upgraded to perform a 5G NSA network function. The 4G core network may include a Mobility Management Entity (MME) 124 that is a mobility management device in the 4G network and a Serving Gateway/Packet Data Network Gateway (SGW/PGW) 126 that is a gateway device in the 4G network. The MME 124 performs signaling and control functions to support access to the network connection of the terminal 107, allocation of network resources, tracking, paging, roaming, handover, etc. It is a network entity of the 4G network. MME 124 controls functions related to subscriber and session management. The MME 124 manages the 4G base stations 122 and performs signaling for selection of a conventional gateway for handover to another 2G/3G network. In addition, the MME 124 performs functions such as security procedures, terminal-to-network session handling, and idle terminal location management. The SGW/PGW 126 is responsible for call processing, signaling processing, and data packet processing functions in the 4G core network. The 4G core network may further include a Home Subscriber Server (HSS) 135 that performs a function similar to the UDM 135 in the 5G SA network for storing subscriber profile information and policy data. In an embodiment, the HSS 135 may be configured as one unit with the UDM 135 as shown. In one embodiment, the HSS 135 may be configured as an independent unit separate from the UDM.

The terminal 107 may receive a voice service and/or a data service by accessing the 5G SA network 152 through the 5G base station 112 . According to the disclosed technology, when a failure occurs in the 5G SA core network while the terminal 107 is receiving the 5G SA service, the UDM 135 detects that there is a failure in the 5G SA core network device such as the SMF 116 and responds accordingly. By controlling the AMF 114 and the 5G base station 112 to transmit a network re-registration induction message to the terminal 107 through the AMF 114 and the 5G base station 112, the terminal 107 can continue to receive the service based on the NSA. Upon receiving the network reconnection induction message, the terminal 107 determines that access to the 5G NSA network 154 is necessary for reasons such as a failure of the 5G SA network 152 and attempts to access the 5G NSA network 154 . .

2 is a diagram illustrating an embodiment of a flowchart for explaining a method of performing service recovery in case of a 5G SA core network failure.

In the method for performing service recovery according to the disclosed technology, as shown in FIG. 2 , the terminal 107 is connected to the 5G SA network 152 and one or more PDU sessions for a voice service and/or data service are generated, and the terminal 107 ) is being serviced through the session, and the 5G SA core network fails and is performed as a follow-up procedure in a state in which uplink/downlink traffic is disconnected. If a failure occurs in the 5G SA core network, service recovery cannot be performed automatically, making it impossible for customers to use voice or data services. In addition, even if a failure recovery is performed for a device having a failure, it is impossible for the terminal 107 to receive service again through the device from which the device has failed because information managed by the device is erased. In the following description, for convenience of description, a method according to the disclosed technology will be described by taking as an example a case in which a failure occurs in the session management device 116 among 5G SA core network devices.

The method for performing service recovery according to the disclosed technology starts from the step S205 of detecting that there is a failure in the session management device 116 in the user data management device 135 as shown in FIG. In this step, the user data management device 135 may detect that the session management device 116 has a failure by receiving a message notifying that the session management device 116 has a failure from the session management apparatus 116 . Alternatively, in this step, the user data management apparatus 135 may detect that there is a failure in the session management apparatus 116 by detecting that the interworking between the user data management apparatus 135 and the session management apparatus 116 is cut off. Alternatively, in this step, the user data management device 135 receives a message notifying that there is a failure in the session management device 116 from the 5G core network monitor and companion device 118, thereby indicating that there is a failure in the session management device 116. can detect Alternatively, in this step, a flag indicating that there is a failure in the session management apparatus 116 is set in the user data management apparatus 135 by a network operator, thereby indicating that the session management apparatus 116 has a failure. can detect The network operator checks that an alarm is raised in relation to the session management device 116 or that a Key Performance Indicator (KPI) indicating the quality of service goes down, and sets a flag indicating that there is a failure in the session management device 116 to the data management device 135 . can be set to In one embodiment, the user data management device 135 is a UDM 135 defined in 3GPP. In one embodiment, the session management device 116 is an SMF 116 defined in 3GPP. In one embodiment, the 5G core network monitor and companion device 118 is an NRF 118 defined in 3GPP. In step S210 , the user data management device 135 sends a first network re-registration induction message to the core access and mobility management device 114 in response to detecting that there is a failure in the session management device 116 . transmit Here, the first network reconnection inducing message may be a message inducing reconnection to the 5G NSA network 154 . In one embodiment, the core access and mobility management device 114 is an AMF 114 defined in 3GPP. In step S215 , a message notifying that there is a failure in the session management device 116 is transmitted from the core access and mobility management device 114 to the mobility management device 124 in charge of the NSA service. In one embodiment, the mobility management device 124 is an MME 124 defined in 3GPP. In step S220 , the second network reconnection induction message is transmitted from the core access and mobility management device 114 to the at least one 5G terminal 107 through the 5G base station 112 . Here, the second network reconnection inducing message is a message inducing reconnection to the 5G NSA network 154 like the first network reconnection inducing message. In one embodiment, the target 5G terminal to which the second network reconnection induction message is transmitted from the core access and mobility management device 114 may include at least one 5G terminal linked to the session management device 116 in which the failure occurred. have. In an embodiment, the 5G terminal to which the second network reconnection induction message is transmitted from the core access and mobility management apparatus 114 may include at least one terminal connected to the 5G SA network 152 . This is in consideration of the possibility that other session management devices and/or other 5G SA core network devices other than the corresponding session management device 116 may not operate normally as a failure occurs in the session management device 116 . In the above, after the step (S215) of delivering a message informing that there is a failure in the session management device 116 to the mobility management device 124 in charge of the NSA service from the core access and mobility management device 114, core access and mobility Although the management device 114 has been described as performing the step (S220) of transmitting the second network reconnection induction message to at least one 5G terminal through the 5G base station 112, the step (S215) is performed after the step (S220). It should be understood and construed as being included in the scope of the disclosed technology and the embodiments are also possible.

Upon receiving the second network reconnection induction message, the 5G terminal 107 determines that access to the 5G NSA network 154 is necessary for reasons such as a failure of the 5G SA network 152 and accesses the 5G NSA network 154 . try In step S225 , the mobility management device 124 in charge of the NSA service receives the first access request message from the 5G terminal 107 through the 4G base station 122 . Here, the first access request message may be a message requesting access to the 5G NSA network 154 . In step S230 , the mobility management device 124 checks whether a failure has occurred in the session management device 116 . If it is determined that a failure has not occurred in the session management device 116 as a result of the check in step S230 , the second access request message is transmitted from the mobility management device 124 to the session management device 116 in step S235 . Thus, the terminal 107 is reconnected to the 5G SA network 152 again. On the other hand, if it is determined that a failure has occurred in the session management device 116 as a result of the inspection in step S230 , the mobility management device 124 receives the session management device 116 from the core access and mobility management device 114 in step S215 . ), the first access request message is determined to be received according to the failure condition of the session management device 116 based on the receipt of a message indicating that there is a failure, and the gateway device 126 in charge of the NSA service in step S240 ) so that the terminal 107 is connected to the 5G NSA network 154 by transmitting the second access request message. In one embodiment, the gateway device 126 responsible for the NSA service is the SGW/PGW 126 in the 4G network. In the above description, the second access request message is transmitted to the gateway device 126 in charge of the NSA service only when it is confirmed that a failure has occurred in the session management device 116 in the mobility management device 124, but step S230 is An embodiment in which step S240 is performed immediately after omitting and performing step S225 is also possible, and this embodiment should be interpreted and understood as being included in the scope of the disclosed technology.

When the terminal 107 is connected to the 5G NSA network 154 through an access procedure including a network authentication procedure and a PDU (Protocol Data Unit) session creation procedure, the terminal 107 continues NSA-based voice, You will be able to receive text and/or data services. Once the terminal 107 is connected to the 5G NSA network 154 , it does not attempt to access the 5G SA network 152 , such as handover to the 5G SA network 152 , and continues to receive service from the 5G NSA network 154 . do.

In the above description, the meaning of the description that a component is connected to or coupled to another component means that the component is directly connected or coupled to the other component, as well as one or more other components interposed therebetween. It should be understood to include the meaning that may be connected or coupled through an element. In addition, terms for describing the relationship between elements (eg, 'between', 'between', etc.) should also be interpreted with similar meanings.

In the embodiments disclosed herein, the arrangement of the illustrated components may vary depending on the environment or requirements in which the invention is implemented. For example, some components may be omitted or some components may be integrated and implemented as one. Also, the arrangement order and connection of some components may be changed.

In the above, various embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and the above-described embodiments depart from the gist of the present invention as claimed in the appended claims. Without this, various modifications may be made by those of ordinary skill in the art to which the present invention pertains, and these modified embodiments should not be understood separately from the technical spirit or scope of the present invention. Accordingly, the technical scope of the present invention should be defined only by the appended claims.

107: terminal
112: 5G base station
114: AMF
116: SMF
118: NRF
122: 4G base station
124: MME
126: SGW/PGW
135: UDM (HSS)
152: 5G SA network
154: 5G NSA network

Claims (28)

As a method of performing service recovery in case of 5G (5th Generation) SA (Standalone) core network failure,
Detecting in the user data management device that there is a failure in the 5G SA core network device;
transmitting a first network re-registration inducing message from the user data management device to the core access and mobility management device - The first network reconnection induction message is a message inducing reconnection to the 5G NSA network -, and
transmitting a second network reconnection inducing message from the core access and mobility management device to at least one 5G terminal linked to the 5G SA core network device with the failure through a 5G base station - The second network reconnection inducing message is 5G A method of performing service recovery, including - a message inducing reconnection to the NSA network.
According to claim 1,
The user data management apparatus is a User Data Management (UDM) defined in a 3rd Generation Partnership Project (3GPP).
According to claim 1,
The method for performing service recovery, wherein the core access and mobility management device is an AMF (Core Access and Mobility Management Function) defined in 3GPP.
According to claim 1,
Wherein the 5G SA core network device includes a session management device.
5. The method of claim 4,
The session management device is a Session Management Function (SMF) defined in 3GPP, a service recovery performing method.
5. The method of claim 4,
The step of detecting, in the user data management device, that there is a failure in the 5G SA core network device, the user data management device receives a message notifying that there is a failure in the session management device from the session management device, thereby causing the failure in the session management device. A method of performing service recovery, comprising the step of detecting that there is.
5. The method of claim 4,
The step of detecting that there is a failure in the 5G SA core network device in the user data management device may include detecting that the interworking between the user data management device and the session management device is disconnected in the user data management device, whereby the session management device has a failure A method of performing service recovery, comprising the step of detecting
5. The method of claim 4,
The step of detecting that there is a failure in the 5G SA core network device in the user data management device may include: In the user data management device, the session management by receiving a message notifying that there is a failure in the session management device from the 5G core network monitor and companion device A method of performing service recovery comprising the step of detecting a device failure.
9. The method of claim 8,
The 5G core network monitor and companion device is a Network Repository Function (NRF) defined in 3GPP, a service recovery method.
5. The method of claim 4,
The step of detecting that there is a failure in the 5G SA core network device in the user data management device may include setting a flag indicating that there is a failure in the session management device in the user data management device by a network operator. Containing the step of detecting that there is a failure in the session management device, the method of performing service recovery.
According to claim 1,
transmitting a second network reconnection inducing message from the core access and mobility management device to at least one 5G terminal linked to the 5G SA core network device with the failure through a 5G base station - The second network reconnection inducing message is 5G Message for inducing reconnection to NSA network - Previously, the core access and mobility management device transmits a message notifying that there is a failure in the 5G SA core network device to the mobility management device in charge of NSA (Non-standalone) service A method of performing service recovery, further comprising the step of:
12. The method of claim 11,
The method of performing service recovery, wherein the mobility management device in charge of the non-standalone (NSA) service is a mobility management entity (MME) defined in 3GPP.
12. The method of claim 11,
Receiving a first access request message through a 4G base station from the at least one 5G terminal in the mobility management device in charge of the NSA service - The first access request message requests access to the 5G NSA network message to -, how to perform service recovery.
14. The method of claim 13,
Further comprising the step of transmitting a second access request message from the mobility management device in charge of the NSA service to the gateway device in charge of the NSA service - The second access request message is a message requesting access to the 5G NSA network -, How to perform service recovery.
14. The method of claim 13,
In response to the mobility management device in charge of the NSA service confirming that there is a failure in the 5G SA core network device, further comprising the step of forwarding a second connection request message to the gateway device in charge of the NSA service - the second The access request message is a message requesting access to the 5G NSA network -, how to perform service recovery.
16. The method of claim 14 or 15,
The gateway device in charge of the NSA service includes a Serving Gateway (SGW) and a Packet Data Network Gateway (PGW) defined in 3GPP.
According to claim 1,
transmitting a second network reconnection inducing message from the core access and mobility management device to at least one 5G terminal linked to the 5G SA core network device with the failure through a 5G base station - The second network reconnection inducing message is 5G This is a message inducing reconnection to the NSA network - Afterwards, the step of transmitting a message informing that there is a failure in the 5G SA core network device from the core access and mobility management device to the mobility management device in charge of the NSA service How to perform service recovery.
18. The method of claim 17,
Receiving a first access request message through a 4G base station from the at least one 5G terminal in the mobility management device in charge of the NSA service - The first access request message requests access to the 5G NSA network message to -, how to perform service recovery.
19. The method of claim 18,
Further comprising the step of transmitting a second access request message from the mobility management device in charge of the NSA service to the gateway device in charge of the NSA service - The second access request message is a message requesting access to the 5G NSA network -, How to perform service recovery.
A method of performing service recovery in the event of a failure of a session management device in a user data management device, the method comprising:
detecting a failure in the session management device; and
Controlling a network reconnection induction message to be transmitted to at least one 5G terminal connected to the 5G SA network through the core access and mobility management device and the 5G base station - The network reconnection induction message induces reconnection to the 5G NSA network message - how to perform service recovery, including .
21. The method of claim 20,
The method for performing service recovery, wherein the user data management device is a UDM defined in 3GPP.
21. The method of claim 20,
The session management device is an SMF defined in 3GPP, a method for performing service recovery.
21. The method of claim 20,
The core access and mobility management device is an AMF defined in 3GPP, service recovery performing method.
21. The method of claim 20,
The step of detecting that there is a failure in the session management apparatus includes detecting that there is a failure in the session management apparatus by receiving a message from the session management apparatus notifying that there is a failure in the session management apparatus. .
21. The method of claim 20,
The step of detecting that there is a failure in the session management apparatus includes detecting that there is a failure in the session management apparatus by detecting that interworking between the user data management apparatus and the session management apparatus is cut off.
21. The method of claim 20,
The step of detecting that there is a failure in the session management device includes the step of detecting that there is a failure in the session management device by receiving a message notifying that there is a failure in the session management device from a 5G core network monitor and companion device. How to perform recovery.
27. The method of claim 26,
The 5G core network monitor and companion device is an NRF defined in 3GPP, a method of performing service recovery.
21. The method of claim 20,
The step of detecting that there is a failure in the session management apparatus includes detecting that there is a failure in the session management apparatus by setting a flag indicating that there is a failure in the session management apparatus in the user data management apparatus by a network operator , how to perform service recovery.

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