KR20210039922A - Apparatus and method for network management message transfer in wireless communication system - Google Patents

Abstract

The present disclosure relates to a 5^th generation (5G) or pre-5G communication system for supporting higher data transmission rates than a 4^th generation (4G) communication system such as long-term evolution (LTE). According to various embodiments of the present disclosure, a method for operating a first access and mobility management function (AMF) network node in a wireless communication system is provided. The method comprises the steps of: receiving an uplink remote interference management information transfer message including information about a second base station not connected to first AMF from a first base station connected to the first AMF; selecting a second AMF connected to the second base station based on the information about the second base station; transferring a message transfer request message to the second AMF; receiving a message transfer response message from the second AMF; and transferring an uplink remote interference management information transfer response message to the first base station.

Description

Device and method for transmitting network management message in wireless communication system {APPARATUS AND METHOD FOR NETWORK MANAGEMENT MESSAGE TRANSFER IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure generally relates to a wireless communication system, and more particularly, to an apparatus and method for transmitting a network management message in a wireless communication system.

4G (4 ^th generation) to meet the traffic demand in the radio data communication system increases since the commercialization trend, efforts to develop improved 5G (5 ^th generation) communication system, or pre-5G communication system have been made. For this reason, the 5G communication system or the pre-5G communication system is called a Beyond 4G Network communication system or a Long Term Evolution (LTE) system (Post LTE) system.

In order to achieve a high data rate, 5G communication systems are being considered for implementation in an ultra-high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the propagation distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of the system, in 5G communication system, advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed.

In addition, in the 5G communication system, the advanced coding modulation (Advanced Coding Modulation, ACM) method of FQAM (Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technology, FBMC (Filter Bank Multi). Carrier), NOMA (Non Orthogonal Multiple Access), and SCMA (Sparse Code Multiple Access) are being developed.

Based on the above discussion, the present disclosure provides an apparatus and method for transmitting a network management message in a wireless communication system.

According to various embodiments of the present disclosure, a method of operating a first access and mobility management function (AMF) network node in a wireless communication system is provided. The method includes a process of receiving an uplink remote interference management information transfer message including information on a second base station not connected to the first AMF from a first base station connected to the first AMF, and A process of selecting a second AMF connected to the second base station based on information about the second base station, a process of transmitting a message transmission request message to the second AMF, a process of receiving a message transmission response message from the second AMF, and And transmitting an uplink remote interference management information transfer response message to the first base station.

According to various embodiments of the present disclosure, a first access and mobility management function (AMF) network node in a wireless communication system is provided. The apparatus includes at least one transceiver, and at least one processor, wherein the at least one processor includes information on a second base station not connected to the first AMF from a first base station connected to the first AMF. Receiving an uplink remote interference management information transfer message, selecting a second AMF connected to the second base station based on information on the second base station, and transmitting a message transmission request message to the second AMF, , Receiving a message transmission response message from the second AMF, and transmitting an uplink remote interference management information transfer response message to the first base station.

An apparatus and method according to various embodiments of the present disclosure may provide an apparatus and method for transmitting a network management message in a wireless communication system.

The effects obtainable in the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may be clearly understood by those of ordinary skill in the technical field to which the present disclosure belongs from the following description. will be.

1 shows an example of a 5G system architecture using a reference point representation in a wireless communication system.
2 is a diagram illustrating a configuration of a network entity in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a wireless communication system according to various embodiments of the present disclosure.
4 illustrates a procedure for transmitting a remote interference management message in a wireless communication system according to various embodiments of the present disclosure.
5 illustrates a procedure for transmitting a remote interference management message in a wireless communication system according to various embodiments of the present disclosure.
6 illustrates an AMF registration procedure in a wireless communication system according to various embodiments of the present disclosure.
7 illustrates an AMF discovery and selection procedure in a wireless communication system according to various embodiments of the present disclosure.
8 illustrates an AMF discovery and selection procedure in a wireless communication system according to various embodiments of the present disclosure.
9 illustrates an example of a 5G System (5GS) network structure according to various embodiments of the present disclosure.
10 illustrates a terminal registration procedure in a wireless communication system according to various embodiments of the present disclosure.
11 illustrates a re-authentication procedure in a wireless communication system according to various embodiments of the present disclosure.

Terms used in the present disclosure are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in the present disclosure. Among the terms used in the present disclosure, terms defined in a general dictionary may be interpreted as having the same or similar meanings as those in the context of the related technology, and unless explicitly defined in the present disclosure, an ideal or excessively formal meaning Is not interpreted as. In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware approach is described as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, various embodiments of the present disclosure do not exclude a software-based approach.

Hereinafter, the present disclosure relates to an apparatus and method for providing subscription data to a non-subscriber registered terminal in a wireless communication system.

In the following description, a term referring to a signal, a term referring to a channel, a term referring to control information, a term referring to network entities, a term referring to a component of a device, etc. are for convenience of description. It is illustrated. Accordingly, the present disclosure is not limited to terms to be described later, and other terms having an equivalent technical meaning may be used.

In addition, although the present disclosure describes various embodiments using terms used in some communication standards (eg, 3rd Generation Partnership Project (3GPP)), this is only an example for description. Various embodiments of the present disclosure may be easily modified and applied to other communication systems.

1 shows an example of a 5G system architecture using a reference point representation in a wireless communication system.

Referring to FIG. 1, the 5G system architecture may include various components (ie, network functions (NF)), and FIG. 1 shows an authentication server function corresponding to some of them. AUSF), access and mobility management function ((core) access and mobility management function (AMF)), session management function (SMF), policy control function (PCF), application function (AF) ), unified data management (UDM), data network (DN), user plane function (UPF), (radio) access network, (R)AN ), a terminal, that is, a user equipment (UE).

Each NF supports the following functions.

-AUSF stores data for authentication of the UE.

-AMF provides a function for UE-level access and mobility management, and can be connected to one AMF by default per UE.

Specifically, AMF is signaling between CN nodes for mobility between 3GPP access networks, termination of a radio access network (RAN) CP interface (ie, NG2 interface), termination of NAS signaling (NG1), NAS signaling security (NAS ciphering and integrity protection), AS security control, registration management (registration area management), connection management, idle mode UE reachability (control of paging retransmission, and Implementation), mobility management control (subscription and policy), intra-system mobility and inter-system mobility support, support for network slicing, SMF selection, lawful intercept (AMF events and LI systems) Interface), providing session management (SM) message delivery between UE and SMF, transparent proxy for SM message routing, access authentication, access authorization including roaming authorization check It supports functions such as (access authorization), delivery of SMS messages between the UE and the SMSF, security anchor function (SAF) and/or security context management (SCM).

Some or all functions of AMF may be supported within a single instance of one AMF.

-DN means, for example, operator service, internet access, or 3rd party service. The DN transmits a downlink protocol data unit (PDU) to the UPF or receives a PDU transmitted from the UE from the UPF.

-PCF receives packet flow information from an application server and provides a function to determine policies such as mobility management and session management. Specifically, PCF supports a unified policy framework to control network operation, provides policy rules so that CP function(s) (eg, AMF, SMF, etc.) can enforce policy rules, and user data storage (user It supports functions such as implementing a front end to access related subscription information for policy decisions within a data repository (UDR).

-The SMF provides a session management function, and when the UE has multiple sessions, it can be managed by a different SMF for each session.

Specifically, SMF manages sessions (for example, session establishment, modification, and termination including tunnel maintenance between UPF and AN nodes), UE IP address allocation and management (optionally including authentication), and selection of UP functions. And control, setting traffic steering to route traffic from the UPF to an appropriate destination, termination of interfaces to policy control functions, enforcement of the control part of policy and quality of service (QoS), and legitimate interception (lawful intercept) (for the SM event and the interface to the LI system), termination of the SM part of the NAS message, downlink data notification, initiator of AN specific SM information (via N2 via AMF) Transfer to AN), SSC mode determination of the session, and roaming functions.

Some or all functions of the SMF may be supported within a single instance of one SMF.

-UDM stores user subscription data and policy data. UDM includes two parts: an application front end (FE) and a user data repository (UDR).

The FE includes the UDM FE in charge of location management, subscription management, and credential processing, and the PCF in charge of policy control. The UDR stores the data required for the functions provided by the UDM-FE and the policy profile required by the PCF. Data stored in the UDR includes user subscription data and policy data including subscription identifiers, security credentials, access and mobility-related subscription data, and session-related subscription data. UDM-FE accesses subscription information stored in UDR and supports functions such as authentication credential processing, user identification handling, access authentication, registration/mobility management, subscription management, and SMS management. do.

-The UPF delivers the downlink PDU received from the DN to the UE via the (R)AN, and delivers the uplink PDU received from the UE via the (R)AN to the DN.

Specifically, UPF is an anchor point for intra/inter RAT mobility, an external PDU session point of an interconnect to a data network, packet routing and forwarding, packet inspection, and User plane part of policy rule enforcement, lawful intercept, traffic usage report, uplink classifier to support routing of traffic flow to data network, multi-homed PDU session Branch point to support, QoS handling for user plane (e.g. packet filtering, gating, uplink/downlink rate enforcement), uplink traffic verification (service data flow (service Data flow (SDF) and SDF mapping between QoS flows), transport level packet marking in uplink and downlink, downlink packet buffering, and downlink data notification triggering functions are supported. Some or all functions of the UPF may be supported within a single instance of one UPF.

-AF interoperates with the 3GPP core network for service provision (e.g., supports functions such as application impact on traffic routing, access to network capability exposure, and interaction with the policy framework for policy control). It works.

-(R)AN is a new radio that supports both evolved E-UTRA (evolved E-UTRA), an evolved version of 4G radio access technology, and new radio (NR) (e.g., gNB). Collectively refers to the access network.

gNB provides functions for radio resource management (i.e., radio bearer control, radio admission control, connection mobility control), and dynamics of resources to the UE in uplink/downlink. Allocation (dynamic allocation of resources) (i.e., scheduling)), IP (internet protocol) header compression, encryption and integrity protection of user data streams, routing to AMF is not determined from information provided to the UE In this case, selection of AMF at the time of UE attachment, user plane data routing to UPF(s), control plane information routing to AMF, connection setup and termination, scheduling and transmission of paging messages (generated from AMF), system Scheduling and transmission of broadcast information (generated from AMF or operating and maintenance (O&M)), measurement and measurement report settings for mobility and scheduling, transport level packet marking in uplink, Session management, support for network slicing, QoS flow management and mapping to data radio bearers, support for UE in inactive mode, NAS message distribution function, NAS node selection function, radio access network sharing , Dual connectivity, and tight interworking between NR and E-UTRA.

-UE means user equipment. User equipment may be referred to in terms of terminal, mobile equipment (ME), mobile station (MS), and the like. In addition, the user device may be a portable device such as a notebook computer, a mobile phone, a personal digital assistant (PDA), a smartphone, or a multimedia device, or may be a non-portable device such as a personal computer (PC) or a vehicle-mounted device.

1 illustrates an unstructured data storage network function (UDSF), a structured data storage network function (SDSF), and a network exposure function (NEF) for clarity. ) And an NF repository function (NRF) are not shown, but all NFs shown in FIG. 5 may interoperate with UDSF, NEF, and NRF as needed.

-NEF is provided by 3GPP network functions, for example, for 3rd party, internal exposure/re-exposure, application functions, edge computing. It provides a means to securely expose services and capabilities. NEF receives information (based on the exposed capability(s) of other network function(s)) from other network function(s). NEF can store received information as structured data using a standardized interface to the data storage network function. The stored information is re-exposed to other network function(s) and application function(s) by NEF, and may be used for other purposes such as analysis and the like.

-NRF supports service discovery function. It receives an NF discovery request from the NF instance and provides information on the found NF instance to the NF instance. It also maintains the available NF instances and the services they support.

-SDSF is an optional function to support the function of storing and retrieving information as structured data by any NEF.

-UDSF is an optional function to support the function of storing and retrieving information as unstructured data by any NF.

Meanwhile, in FIG. 1, for convenience of description, a reference model for a case in which the UE accesses one DN using one PDU session is illustrated, but the present disclosure is not limited thereto.

The UE can access two (ie, local and central) data networks simultaneously using multiple PDU sessions. In this case, two SMFs may be selected for different PDU sessions. However, each SMF may have the ability to control both the local UPF and the central UPF within the PDU session.

In addition, the UE may simultaneously access two (ie, regional and central) data networks provided within a single PDU session.

In the 3GPP system, a conceptual link connecting NFs in the 5G system is defined as a reference point. The following exemplifies reference points included in the 5G system architecture represented in FIG. 1.

-NG1: Reference point between UE and AMF

-NG2: Reference point between (R)AN and AMF

-NG3: Reference point between (R)AN and UPF

-NG4: Reference point between SMF and UPF

-NG5: Reference point between PCF and AF

-NG6: Reference point between UPF and data network

-NG7: Reference point between SMF and PCF

-NG8: Reference point between UDM and AMF

-NG9: reference point between two core UPFs

-NG10: Reference point between UDM and SMF

-NG11: Reference point between AMF and SMF

-NG12: Reference point between AMF and AUSF

-NG13: Reference point between UDM and authentication server function (AUSF)

-NG14: reference point between two AMFs

-NG15: a reference point between the PCF and AMF in the case of a non-roaming scenario, and a reference point between the PCF and the AMF in a visited network in the case of a roaming scenario

2 is a diagram illustrating a configuration of a network entity in a wireless communication system according to various embodiments of the present disclosure.

The network entity of the present disclosure is a concept including a network function according to the system implementation. Terms such as'~ unit' and'~ group' used hereinafter refer to units that process at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

The network entity 20 according to various embodiments of the present disclosure may include a communication unit 21, a storage unit 22, and a control unit 23 that controls overall operations of the network entity 20.

The communication unit 21 transmits and receives signals with other network entities. Accordingly, all or part of the communication unit 21 may be referred to as a'transmitter 24', a'receiver 25', or a'transceiver/transceiver 21'.

The storage unit 22 stores data such as a basic program, an application program, and setting information for the operation of the network entity 20. The storage unit 22 may be formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 22 provides stored data according to the request of the control unit 23.

The control unit 23 controls overall operations of the network entity 20. For example, the control unit 23 transmits and receives signals through the communication unit 21. In addition, the control unit 23 writes and reads data in the storage unit 22. In addition, the control unit 23 may perform functions of a protocol stack required by a communication standard. To this end, the control unit 23 may include a circuit, an application-specific circuit, at least one processor or a micro processor, or may be a part of a processor. In addition, a part of the communication unit 21 and the control unit 23 may be referred to as a communication processor (CP). The controller 23 may control the network entity 20 to perform any one of the various embodiments of the present disclosure.

It goes without saying that the communication unit 21 and the control unit 23 are not necessarily implemented as separate modules, but may be implemented as a single component in the form of a single chip or a software block. The communication unit 21, the storage unit 22, and the control unit 23 may be electrically connected. Further, the operations of the network entity 20 can be realized by having a storage unit 22 storing a corresponding program code in the network entity 20.

The network entity 20 includes a network node, a base station (RAN), AMF, SMF, UPF, NF, NEF, NRF, CF, NSSF, UDM, AF, AUSF, SCP, UDSF, context storage, It may be any one of OAM, EMS, configuration server, and ID (identifier) management server.

The 5G system according to various embodiments of the present disclosure may be composed of a terminal, a base station, and a 5G core network. The 5G core network can be composed of network functions (network functions, hereinafter mixed with NF) such as AMF, SMF, PCF, UPF, UDM, UDR, NEF, NSSF, NRF, and SCP. According to various embodiments of the present disclosure, a network function (NF) may mean a network entity (hereinafter, used together with NE) and a network resource. NG-RAN (next generation-radio access network, hereinafter referred to as 5G-RAN, mixed with RAN) refers to a base station that provides a wireless communication function to a terminal. A terminal (user equipment, terminal, UE) can access the 5G core network through a base station.

In addition, various network functions described below may be composed of one specific physical device or two or more physical devices. In addition, each of the physical devices may include a program (software) for executing the methods described below under the control of a processor included therein. In the following description, only the names of each NF are presented for convenience of explanation, but as described above, it is implemented as a physical device including at least one processor, and a program (software) for the operation described in the present disclosure is mounted. It is obvious to those skilled in the art that it can be (mounted). Therefore, the expression "device" will be omitted below, and will be described only with the name of a specific NF.

According to various embodiments of the present disclosure, an access and mobility management function (AMF) is a network function for managing wireless network access and mobility for a terminal. A session management function (SMF) is a network function that manages connection to a packet data network (PDN) provided to a terminal. The PDN connection is referred to as a PDU (protocol data unit) session. The PDU session information may include quality of service (QoS) information, billing information, or packet processing information. The policy control function (PCF) is a network function that applies a service policy of a mobile communication service provider to a terminal, a billing policy, and a policy for a PDU session. The user plane function (UPF) serves as a gateway for transmitting packets transmitted and received by the terminal, and is a network function controlled by the SMF. The UPF is connected to a data network (DN) and serves to transmit an uplink data packet generated by a terminal to an external data network through a 5G system. In addition, the UPF serves to deliver a downlink data packet generated and received in an external data network to a terminal through a 5G system. For example, the UPF is connected to a data network connected to the Internet, and can route data packets sent by the terminal to the Internet, and can route data packets sent from the Internet to the terminal.

Unified data management (UDM) is a network function that stores and manages information on subscribers. NEF (network exposure function) allows access to terminal management information in a 5G network, so subscription to terminal mobility management events, subscription to terminal session management events, and sessions It is connected to 5G core network NFs such as requesting related information, setting charging information of the terminal, requesting to change the PDU session policy for the terminal, etc., and transmitting information about the terminal to the NFs or information about the terminal. It is a network function that performs the role of reporting data to the outside. AF (application function) is a network function that can use the services and functions provided by the 5G network through NEF.

The unified data repository (UDR) is a network function that stores and manages data. For example, the UDR may store terminal subscription information and provide terminal subscription information to the UDM. The UDR can store the operator policy information and provide the operator policy information to the PCF. UDR may store network service exposure-related information and provide network service exposure-related information to NEF. The network slice selection function (NSSF) is a network function that determines a network slice available to the UE and determines a network slice instance constituting the network slice.

The network repository function (NRF) is an NF that stores and manages profile information (ie, functional information provided by NF) of NF constituting a 5G core network. A service communication proxy (SCP) is an NF that provides a function of receiving an NF request message as an agent and transmitting the request message to the corresponding NF.

Each NF defines the services they provide, and the services provided by NF can be referred to as Npcf, Nsmf, Namf, Nnef services, and the like. For example, when the AMF delivers a session-related message to the SMF, the AMF can use a service (or API) called Nsmf_PDUSession_CreateSMContext.

In the following description, one service, for example, the Npcf service may collectively refer to messages that can be exchanged with the PCF by using an interface for communicating with the PCF. In the above example, when the AMF delivers a session-related message to the SMF, the AMF is an interface for communicating with the SMF when using a service called Nsmf_PDUSession_CreateSMContext, and may mean a specific message configured according to the format required by the SMF.

The terminal accesses the AMF through the base station and can exchange control plane signaling messages with the 5G core network. In addition, the terminal may access the UPF through the base station and may exchange user plane data with the data network. The application server that provides the application layer service to the terminal may be referred to as AF when exchanging control plane signaling messages with the 5G core network, and may be referred to as DN when exchanging user plane data with the terminal. . Accordingly, AF and DN may be used interchangeably as a name indicating the application server.

Meanwhile, the mobile communication system may be configured as a network supporting network slicing. That is, it is possible to physically configure and manage one network as a logically separated network slice (hereinafter, used together with slices). A mobile communication service provider can provide a dedicated network slice specialized for the service for various services having different characteristics. Each network slice may have different types and amounts of resources required according to service characteristics, and the mobile communication system can guarantee the resources required by each network slice. For example, a network slice providing a voice telephony service may have a high frequency of control plane signaling, and a network slice may be configured with a specialized NF. A network slice providing an Internet data service may have a high frequency of generating large-capacity data traffic, and a network slice may be configured with a specialized NF. In the 5G system defined by 3GPP, one network slice may be referred to as “S-NSSAI”. The single network slice selection assistance information (S-NSSAI) may be composed of a slice/service type (SST) value and a slice differentiators (SD) value. SST represents the characteristics of services supported by the slice (e.g., enhanced mobile broadband (eMBB), internet of things (IoT), ultra-reliable low latency communication (URLLC)), vehicle-to-everything (V2X), etc.). I can. SD can be used as an additional identifier for a specific service referred to as SST.

3 illustrates a configuration of a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 3 shows an example of a 5G system configuration.

Referring to FIG. 3, a 5G system may be composed of a base station 110, 115, and 120 and a 5G core network 100. The base station can wirelessly connect to a terminal located in a specific range to transmit and receive messages. For example, the first base station 110 may be wirelessly connected to a terminal located in the base station coverage 111. In addition, the second base station 115 may be wirelessly connected to a terminal located in the base station coverage 116. In addition, the third base station 120 may be wirelessly connected to a terminal located in the base station coverage 121.

Referring to FIG. 3, the base stations 110, 115, and 120 are connected to the AMFs 101 and 102 to transmit and receive messages to and from the 5G core network 100. For example, the first base station 110 may be connected 112 to the first AMF 101 to transmit and receive messages. In addition, the second base station 115 may be connected 117 to the first AMF 101 to transmit and receive messages. In addition, the third base station 120 may be connected 122 to the second AMF 102 to transmit and receive messages.

Referring to FIG. 3, the first AMF 101 may be connected 112 and 117 to the first base station 110 and the second base station 115. In addition, the second AMF 102 may be connected 122 to the third base station 120.

Referring to FIG. 3, another base station located at a distance from the base station may cause interference with each other. For example, the second base station 115 may interfere with the first base station 110 and/or the third base station 120. A base station according to various embodiments of the present disclosure may transmit and receive a remote interference management (RIM) message between base stations using the process of FIGS. 4 to 5 in order to solve such an interference problem between base stations.

4 illustrates a procedure for transmitting a remote interference management message in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 4 shows an example of a process of transmitting a remote interference management (RIM) message between base stations connected to the same AMF.

Referring to FIG. 4, in step 200, the second base station 115 may detect that interference has occurred with the first base station 110 deployed in an adjacent location. For example, the second base station 115 may determine that interference with the first base station 110 has occurred based on a packet transmission success rate, a packet drop rate, and the like.

The second base station 115 may determine to transmit a remote interference management message in order to solve an interference problem with the first base station 110. For example, the second base station 115 may check whether or not a direct message can be transmitted to the first base station 110. If the second base station 115 cannot directly transmit a message to the first base station 110, that is, if there is no connection between the second base station 115 and the first base station 110, the second base station (115) may determine to transmit the message through the AMF and perform step 205.

In step 205, the second base station 115 may transmit an uplink RIM information transfer message to the AMF 101 connected to the second base station 115. In the uplink remote interference management information transmission message, the message type, transmission base station information (e.g., source RAN node ID indicating the second base station 115), global RAN node ID of the source RAN node ID ( global RAN node ID), selected TAI (tracking area identifier (TAI)) of the source RAN node ID, etc.), receiving base station information (e.g., target RAN node ID indicating the first base station 110) ), global RAN node ID of target RAN node ID, selected TAI of target RAN node ID, etc.), target gNB set ID (target gNB set ID), remote interference management reference signal (RIM-RS) detection, network slice Information (e.g., S-NSSAI (single network slice selection assistance information), SST (slice/service type), etc.), urgency indicator, timer, confirmation response required indicator (Ack needed indicator) At least one or more may be included.

The transmitting base station information may be an identifier indicating a base station transmitting the remote interference management information message.

The receiving base station information may be an identifier indicating a base station to which the remote interference management information message is to be received.

The RAN node ID may be an identifier indicating a base station.

The selected TAI (tracking area identifier) (TAI) may be an identifier indicating a base station coverage of a related base station or a location where interference occurs.

The target gNB set ID may be an identifier indicating a group of gNBs composed of one or more receiving base stations to receive a message.

The network slice information may be an identifier indicating network slice information in which interference has occurred.

The urgency indicator may be an indicator indicating the degree of interference that has occurred and/or should be dealt with quickly.

The timer may be time information indicating to what time the interference occurrence should be resolved.

The Ack needed indicator may be an indicator indicating that the receiving base station should transmit a response message for the processing result after processing the remote interference management information message.

Upon receiving the uplink remote interference management information transmission message, the AMF 101 may determine a base station to transmit the message in various ways, based on the reception base station information included in the message.

According to various embodiments of the present disclosure, the AMF 101 is based on the target RAN node ID, the global RAN node ID of the target RAN node ID, or the selected TAI of the target RAN node ID, the base station to which the message is to be received. 1 It can be determined that it is the base station 110. In addition, the AMF 101 may confirm that there is an NGAP (NG application protocol) connection 112 with the first base station 110 and perform step 210.

According to various embodiments of the present disclosure, the AMF 101 may determine a destination base station group to which the message is to be received, based on the target gNB set ID. The AMF 101 may transmit a message to one base station belonging to the receiving base station group. The AMF 101 may determine that the first base station 110 with the NGAP connection 112 belongs to the receiving base station group, and may perform step 210.

According to various embodiments of the present disclosure, the AMF 101 may determine a destination base station group to which the message is to be received, based on the target gNB set ID. The AMF 101 may transmit a message to all base stations belonging to the receiving base station group. For example, when the uplink remote interference management information transmission message includes an emergency indicator, the AMF 101 knows that it should be processed as an emergency, and can transmit the message to all base stations belonging to the receiving base station group. The AMF 101, among the base stations belonging to the receiving base station group, performs step 210 with all base stations having an NGAP connection with the AMF 101 (for example, the first base station 110 with the NGAP connection 112). I can.

In step 210, the AMF 101 may transmit a downlink RIM information transfer message to the first base station 100. The downlink remote interference management information transmission message may include information included in the uplink remote interference management information transmission message received by the AMF 101 from the second base station 115 in step 205.

Upon receiving the downlink remote interference management information transmission message, the first base station 110 may know that the message has been transmitted from the second base station 115 based on the transmission base station information included in the message. In addition, the first base station 110 knows that interference has occurred with the second base station 115 based on the message type, RIM-RS detection, and transmitting base station information included in the message, You can perform the operation.

According to various embodiments of the present disclosure, when a timer is included in a downlink remote interference management information transmission message, the first base station 110 may perform an operation to reduce interference until a time indicated by the timer.

According to various embodiments of the present disclosure, when an Ack needed indicator is included in a downlink remote interference management information transmission message, the first base station 110 may perform step 215.

In step 215, the first base station 110 may return a downlink remote interference management information transmission response message to the AMF 101.

In step 220, the AMF 101 may return an uplink remote interference management information transmission response message to the second base station 115.

5 illustrates a procedure for transmitting a remote interference management message in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 5 shows a procedure for transmitting a remote interference management message between base stations connected to different AMFs.

Referring to FIG. 5, in step 300, the second base station 115 may detect that interference has occurred with the third base station 120 deployed in an adjacent location. For example, the second base station 115 may determine that interference with the third base station 120 has occurred based on a packet transmission success rate, a packet drop rate, and the like.

The second base station 115 may determine to transmit a remote interference management message in order to solve an interference problem with the third base station 120. For example, the second base station 115 may check whether or not a direct message can be transmitted to the third base station 120. If the second base station 115 cannot directly transmit a message to the third base station 120, that is, if there is no connection between the second base station 115 and the third base station 120, the second base station (115) may determine to transmit the message through the AMF and perform step 305.

In step 305, the second base station 115 may transmit an uplink RIM information transfer message to the first AMF 101 connected to the second base station 115. In the uplink remote interference management information transmission message, the message type, transmission base station information (e.g., source RAN node ID indicating the second base station 115, global RAN node ID of source RAN node ID, and selection of source RAN node ID) TAI, etc.), receiving base station information (e.g., a target RAN node ID representing the third base station 120, a global RAN node ID of the target RAN node ID, a selected TAI of the target RAN node ID, etc.), a target gNB set ID, At least one or more of RIM-RS detection, network slice information (eg, S-NSSAI, SST, etc.), an emergency indicator, a timer, and an acknowledgment need indicator may be included.

The transmitting base station information may be an identifier indicating a base station transmitting the remote interference management information message.

The receiving base station information may be an identifier indicating a base station to which the remote interference management information message is to be received.

The RAN node ID may be an identifier indicating a base station.

The selected TAI may be an identifier indicating a base station coverage of a related base station or a location where interference occurs.

The target gNB set ID may be an identifier indicating a group of gNBs composed of one or more receiving base stations to receive the message.

The network slice information may be an identifier indicating network slice information in which interference has occurred.

The emergency indicator may be an indicator indicating the degree of interference that has occurred and/or should be dealt with quickly.

The timer may be time information indicating to what time the interference occurrence should be resolved.

The acknowledgment required indicator may be an indicator indicating that the receiving base station should transmit a response message for the processing result after processing the remote interference management information message.

Upon receiving the uplink remote interference management information transmission message, the AMF 101 may determine a node to transmit the message in various ways as follows, based on the reception base station information included in the message.

According to various embodiments of the present disclosure, the first AMF 101 is based on the target RAN node ID, the global RAN node ID of the target RAN node ID, or the selected TAI of the target RAN node ID, 3 It is confirmed that there is no NGAP connection between the base station 120 and the first AMF 101, and step 310 may be performed.

According to various embodiments of the present disclosure, the first AMF 101 may determine a destination base station group to which the message is to be received, based on the target gNB set ID. The first AMF 101 may transmit a message to one base station belonging to the receiving base station group. The first AMF 101 may determine that there is no base station belonging to the receiving base station group among base stations that have an NGAP connection with the first AMF 101, and perform step 310.

According to various embodiments of the present disclosure, the first AMF 101 may determine a destination base station group to which the message is to be received, based on the target gNB set ID. The first AMF 101 may transmit a message to all base stations belonging to the receiving base station group. For example, when the uplink remote interference management information transmission message contains an emergency indicator, the first AMF 101 knows that it should be processed as an emergency, and decides to transmit the message to all base stations belonging to the receiving base station group. I can. The first AMF 101 determines that there is a base station (eg, the third base station 120) that does not have an NGAP connection with the first AMF 101 among base stations belonging to the receiving base station group, and performs step 310. You can do it.

In step 310, the first AMF 101 may select an AMF that has an NGAP connection with the third base station 120 to receive the message. For example, the first AMF 101 is connected to the third base station 120 or the receiving base station group based on the configuration information stored in the first AMF 101 and supports the RIM function. You can choose AMF. When network slice information (eg, S-NSSAI, SST, etc.) is included in the uplink remote interference management information transmission message, the first AMF 101 provides an AMF supporting the corresponding network slice based on the configuration information. You can choose. When an emergency indicator is included in the uplink remote interference management information transmission message, the first AMF 101 may select one or more AMFs based on the configuration information. Alternatively, this AMF selection procedure may follow the procedure shown in FIG. 5.

In step 315, the first AMF 101 may transmit a message transfer request message to the second AMF 102 that has an NGAP connection with the third base station 120 to receive the message. The message transmission request message may include information included in the uplink remote interference management information transmission message received from the second base station 115 by the first AMF 101 in step 305.

According to various embodiments of the present disclosure, the first AMF 101 may select the second AMF 102 in step 310 and transmit a message transmission request message to the second AMF 102 in step 315.

According to various embodiments of the present disclosure, the first AMF 101 may transmit a message transmission request message to the second AMF 102 in step 315 using the procedure illustrated in FIG. 8.

Upon receiving the message transmission request message, the second AMF 102 may determine the base station to which the message is to be transmitted in various ways as follows, based on the receiving base station information included in the message.

According to various embodiments of the present disclosure, the second AMF 102 is a base station to receive a message based on a target RAN node ID, a global RAN node ID of the target RAN node ID, or a selected TAI of the target RAN node ID. It may be determined that this is the third base station 120. In addition, the second AMF 102 may confirm that there is an NGAP connection 122 with the third base station 120 and perform step 320.

According to various embodiments of the present disclosure, the second AMF 102 may determine a destination base station group to which the message is to be received, based on the target gNB set ID. The second AMF 102 may transmit a message to one base station belonging to the receiving base station group. The second AMF 102 may determine that the third base station 120 with the NGAP connection 122 belongs to the receiving base station group, and may perform step 320.

According to various embodiments of the present disclosure, the second AMF 102 may determine a destination base station group to which the message is to be received, based on the target gNB set ID. The second AMF 102 may transmit a message to all base stations belonging to the receiving base station group. For example, when an emergency indicator is included in the message, the second AMF 102 knows that it should be processed as an emergency, and can transmit the message to all base stations belonging to the receiving base station group. The second AMF 102 includes all base stations having an NGAP connection with the second AMF 102 among base stations belonging to the receiving base station group (for example, the third base station 120 having an NGAP connection 122, etc.) and 320 Steps can be performed.

In step 320, the second AMF 102 may transmit a downlink RIM information transfer message to the third base station 120. The downlink remote interference management information transmission message may include information included in the message transmission request message received by the second AMF 102 from the first AMF 101 in step 315.

Upon receiving the downlink remote interference management information transmission message, the third base station 120 may know that the message has been transmitted from the second base station 115 based on the transmission base station information included in the message. In addition, the third base station 120 knows that interference has occurred with the second base station 115 based on the message type, RIM-RS detection, and transmitting base station information included in the message, and reduces the interference. You can perform an operation for it.

According to various embodiments of the present disclosure, when a timer is included in a downlink remote interference management information transmission message, the third base station 120 may perform an operation to reduce interference until a time indicated by the timer.

According to various embodiments of the present disclosure, when an Ack needed indicator is included in the downlink remote interference management information transmission message, the third base station 120 may perform step 325.

In step 325, the third base station 120 may return a downlink RIM information transfer response message to the second AMF 102.

In step 330, the second AMF 102 may return a message transfer response message to the first AMF 101. The message transmission request response message may include information included in the downlink remote interference management information transmission response message received in step 325 by the second AMF 102.

In step 335, the first AMF 101 may return an uplink RIM information transfer response message to the second base station 115.

6 illustrates an AMF registration procedure in a wireless communication system according to various embodiments of the present disclosure.

According to various embodiments of the present disclosure, the NRF 103 is an NF that stores and manages profile information (ie, function information provided by NF) of an NF (eg, AMF, etc.) constituting a 5G core network. The second AMF 102 may register the NF profile information of the second AMF 102 to the NRF 103 according to the embodiment of FIG. 6. The first AMF 101 to SCP 104 may obtain the second AMF 102 information from the NRF 103 through the procedure shown in FIGS. 7 to 8.

Referring to FIG. 6, the process of steps 400 to 420 corresponds to a process in which the second AMF 102 initially registers profile information of the second AMF 102 to the NRF 103.

In step 400, the second AMF 102 is an NF register request for registering a network service function (hereinafter, referred to as AMF profile) provided by the second AMF 102 to the NRF 103. You can send a message. The NF registration request message may include AMF profile information supported by the second AMF 102. In the profile information supported by the second AMF 102, a list of TAIs served by the second AMF 102 (a list of TAIs), and a list of base stations that have an NGAP connection with the second AMF 102 (a list of RAN Node IDs), RIM support capability indicator (RIM support capability indicator), network slice information supported by the second AMF 102 (eg, S-NSSAI, SST, etc.) at least one or more may be included. .

The RIM support function indicator may mean that the second AMF 102 can support remote interference management of the base station. For example, it may indicate that the second AMF 102 may receive an uplink remote interference management transmission message from the base station and transmit a downlink remote interference management transmission message to the base station. In addition, it may indicate that the second AMF 102 may receive a remote interference management transmission message from another AMF and transmit a remote interference management transmission message to another AMF.

In step 415, the NRF 103 may store the received AMF profile information.

In step 420, the NRF 103 may return an NF register response message to the second AMF 102. The NF registration response message may include an AMF profile registration result (result indication) that may indicate success or failure. Of course, various embodiments of the present disclosure are not limited to the above example.

Referring to FIG. 6, the process of steps 425 to 435 corresponds to a process of updating profile information of the second AMF 102 previously registered by the second AMF 102 to the NRF 103.

When a change occurs in the profile information supported by the second AMF 102, in step 425, the second AMF 102 provides a network service function provided by the second AMF 102 to the NRF 103 (hereinafter, the AMF profile ( AMF profile)) may transmit an NF update request message. The NF update request message may include an NF instance ID of the second AMF 102 and profile information supported by the second AMF 102. Of course, it is not limited to the above example. The AMF profile information may include all profile information supported by the second AMF 102 or only information that needs to be changed among the AMF profile information.

In step 430, the NRF 103 receiving the NF update request message may find an AMF profile corresponding to the received NF instance ID and update the information (update AMF profile).

In step 435, the NRF 103 may return an NF update response message to the second AMF 102. The NF update response message may include an AMF profile update result (result indication) that may indicate success or failure. Of course, various embodiments of the present disclosure are not limited to the above example.

One or more AMFs may exist in the 5G core network, and each AMF may register and update a profile of each AMF to the NRF 103 through steps 400 to 420 and steps 425 to 435.

7 illustrates an AMF discovery and selection procedure in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 7, the first AMF 101 may discover and select the second AMF 102 through a process of steps 500 to 515.

According to various embodiments of the present disclosure, in step 305 of FIG. 5, the first AMF 101 receives the uplink remote interference management information transmission message, and in order to discover the second AMF 102 to transmit the message, 500 Steps can be performed. Step 310 of FIG. 5 for the first AMF 101 to select the second AMF 102 may correspond to the process of steps 500 to 515 of FIG. 7.

In step 500, the first AMF 101 may transmit an NF discovery request message to the NRF 103. The NF discovery request message may include target AMF (target AMF) information that the first AMF 101 wants to discover. For example, the first AMF 101 includes information included in the uplink remote interference management information transmission message received in step 305 (e.g., a target RAN node ID, a global RAN node ID of the target RAN node ID, a target Based on the selected TAI of the RAN node ID, target gNB set ID, network slice information, etc.), target AMF (target AMF) information may be variously configured as follows.

According to various embodiments of the present disclosure, the target AMF (target AMF) information may include a TAI served by the target AMF (target AMF). The TAI that the target AMF (target AMF) is responsible for may be the selected TAI of the target RAN node ID received in step 305.

According to various embodiments of the present disclosure, the target AMF (target AMF) information may include information about a base station that has a target AMF (target AMF) and an NGAP connection. The base station information that has an NGAP connection with the target AMF may be a target RAN node ID received in step 305, a global RAN node ID of the target RAN node ID, or a target gNB set ID.

According to various embodiments of the present disclosure, the target AMF (target AMF) information may include network slice information supported by the target AMF (target AMF). The network slice information supported by the target AMF (target AMF) may be network slice information received in step 305.

According to various embodiments of the present disclosure, the target AMF (target AMF) information may include a RIM support capability indicator.

In step 505, the NRF 103, which received the NF discovery request message, is included in the NF discovery request message received in step 505, based on the profile information of the NFs stored through the process of FIG. An AMF instance set (a set of AMF instance(s)) that can satisfy a condition of a target AMF (target AMF) can be determined. The AMF instance set may consist of one or more candidate AMF instances. According to various embodiments of the present invention, in step 505, the NRF 103 authorizes NF service discovery.

In step 510, the NRF 103 may return an NF discovery response message to the first AMF 101. The NF discovery response message may include profile information of a candidate AMF instance constituting an AMF instance set selected by the NRF 103 in step 505. The candidate AMF instance profile information includes a list of TAIs in charge of the candidate AMF (candidate AMF), and the base station information to which the candidate AMF (candidate AMF) is connected (for example, RAN node ID, a list of RAN Node IDs, gNB set IDs, etc.), network slice information supported by a candidate AMF (candidate AMF) (e.g., S-NSSAI, a list of S-NSSAIs (a list of S-NSSAIs), SST, etc.), RIM support function indicator indicating whether the candidate AMF (candidate AMF) supports RIM, load information of the candidate AMF (candidate AMF), candidate AMF (candidate AMF) address (e.g. For example, it may include at least one of fully qualified domain names (FQDN), IP address, etc.).

According to various embodiments of the present disclosure, the NRF 103 may select one candidate AMF (candidate AMF) that satisfies the target AMF condition in step 505 and include it in the NF discovery response message. For example, the NRF 103 confirms that the second AMF 102 registered through the process of FIG. 6 satisfies the condition of the target AAMF (target AMF) requested by the first AMF 101 in step 500, and , The second AMF 102 may be selected as a candidate AMF (candidate AMF). The NRF 103 may include profile information of the second AMF 102 in the NF discovery response message.

According to various embodiments of the present disclosure, the NRF 103 may select one or more candidate AMFs that satisfy a target AMF (target AMF) condition in step 505 and include it in the NF discovery response message. For example, the NRF 103 confirms that the second AMF 102 registered through the process of FIG. 6 satisfies the condition of the target AMF (target AMF) requested by the first AMF 101 in step 500, and , The second AMF 102 may be selected as a candidate AMF (candidate AMF). The NRF 103 may include a set of candidate AMF instances (eg, composed of one or more candidate AMF instances) in the NF discovery response message, and the profile information of the second AMF 102 is configured to configure the set of candidate AMF instances. It may be included as one candidate AMF (candidate AMF).

In step 515, the first AMF 101 may select an AMF in various ways as follows, based on the received candidate AMF instance profile information.

According to various embodiments of the present disclosure, when two or more candidate AMF instance profile information is received, the first AMF 101 may select one AMF instance among them. In order for the first AMF 101 to select one of two or more candidate AMFs (candidate AMF), the first AMF 101 receives information received from the second base station 115 in step 305 and/or step 510 The information received from the NRF 103 may be considered. For example, the first AMF 101 refers to the load information of the candidate AMF (candidate AMF) and whether the candidate AMF (candidate AMF) supports the RIM function, and the candidate AMF (candidate AMF) supporting the RIM function Among them, the AMF with the lowest load can be selected. In addition, the first AMF 101 refers to the network slice information supported by the candidate AMF (candidate AMF), and supports the network slice received from the second base station 115 in step 305 of the candidate AMF. You can choose. In addition, the first AMF 101 considers the load information of the candidate AMF (candidate AMF), and is remote from the second base station 115 to a time received from the second base station 115 in step 305 of the candidate AMF (candidate AMF). An AMF determined to be capable of processing an interference management request message may be selected. In addition, when the first AMF 101 receives the urgency indicator from the second base station 115 in step 305, it may select one or more AMFs.

According to various embodiments of the present disclosure, when receiving profile information of one candidate AMF instance, the first AMF 101 may select a corresponding AMF.

The first AMF 101, which selects the second AMF 102 in step 515, uses the profile information of the second AMF 102 (for example, the FQDN to the IP address of the second AMF 102, etc.), In step 315, a message transfer request message may be transmitted to the second AMF 102. If more than one AMF is selected in step 510, the first AMF 101 may transmit a message transfer request message to each selected AMF. Thereafter, in step 330, the second AMF 102 may transmit a message transfer response message to the first AMF 101.

8 illustrates an AMF discovery and selection procedure in a wireless communication system according to various embodiments of the present disclosure.

According to various embodiments of the present disclosure, the SCP 104 is an NF that provides a function of receiving an NF request message by proxy and transmitting a request message to a corresponding NF.

Referring to FIG. 8, the first AMF 101 may transmit a message transmission request message to the second AMF 102 through the SCP 104 through steps 600 to 610.

According to various embodiments of the present disclosure, the first AMF 101 may receive an uplink remote interference management information transmission message in step 305 of FIG. 5 and perform step 600 to transmit the message. Step 315 of FIG. 5 in which the first AMF 101 transmits the message transmission request message to the second AMF 102 may correspond to the process of steps 600 to 610 of FIG. 8. In this case, the first AMF 101 may not perform step 310 of FIG. 5.

In step 600, the first AMF 101 may transmit a message transfer request message to the SCP 104. The message transfer request message is a message that must be sent to an AMF capable of processing the message, but the first AMF 101 in step 600 does not know the AMF information capable of processing the message, so SCP( 104) is sent a message transfer request message. In the message transfer request message, information for selecting an AMF capable of processing the message by the SCP 104 (e.g., NF discovery request described in step 500 of FIG. 7) Information included in the message) and information to be transmitted to the AMF selected by the SCP 104 (for example, information included in the message transfer request message described in step 315 of FIG. 5) may be included. . That is, the message transfer request message may include selection and discovery parameters.

In step 605, the SCP 104 may select the second AMF 102 based on the received target NF (target NF) information. The SCP 104 may select the second AMF 102 based on configuration information stored by the SCP 104. Alternatively, the SCP 104 transmits an NF discovery request message to the NRF 103, receives an NF discovery response message from the NRF 103, and obtains an NF discovery response message from the NRF 103. The second AMF 102 may be selected based on candidate AMF (candidate AMF) profile information. The method for selecting the AMF based on the information received from the first AMF 101 and/or the NRF 103 by the SCP 104 is described in the process from steps 505 to 515 in FIG. 7. Follow the method. Upon receiving the AMF profile information from the NRF 103, the SCP 104 stores the received AMF profile information, and then, when it is necessary to select an AMF that supports a similar function (eg, AMF supporting RIM function), Based on the stored information, that is, without additional communication with the NRF (103), it is possible to select the AMF.

In step 610, the SCP (104) may deliver a message transfer request (message transfer request) message to the selected second AMF (102). The message transmission request message may include information (eg, a message transmission request message) received by the SCP 104 from the first AMF 101 in step 600.

Upon receiving the message transfer request message, the second AMF 102 performs the process of FIG. 5 to process a message transfer request message, and responds to the first AMF 101 with a message transfer request ( message transfer response) message can be transmitted. Step 330 of FIG. 5 in which the second AMF 102 transmits the message transmission request response message to the first AMF 101 may correspond to the process of steps 615 to 620 of FIG. 8.

In step 615, the second AMF 102 may transmit a message transfer response message to the SCP 104.

In step 620, the SCP (104) may deliver a message transfer request response (message transfer response) message to the first AMF (101).

9 illustrates an example of a 5G System (5GS) network structure according to various embodiments of the present disclosure.

Referring to FIG. 9, a 5G Core Network (5GC) includes an Access and Mobility Management Function (AMF) 920, a Session Management Function (SMF) 935, a User Plane Function (UPF) 930, and PCF. (Policy Control Function)(940, 941), UDM(Unified Data Management)(945), NSSF(Network Slice Selection Function)(960), AUSF(Authentication Server Function)(965), UDR(Unified Data Repository)(950) ), AAA (Authentication, Authorization and Accounting) 980, and the like. The terminal 900 may access the 5G core network through the base station 910. Hereinafter, the UE 900 may be referred to as the terminal 900 and the (R)AN 910 may be referred to as the base station 910. In addition, the 5G core network may further include an application function (AF) 970 and a data network (DN) 975.

The AMF 920 is a network function (NF) that manages wireless network access and mobility for the terminal 900.

The SMF 935 is an NF that manages a session for the terminal 900, and the session information includes quality of service (QoS) information, charging information, and packet processing information.

The UPF 930 is an NF that processes user traffic (eg, User Plane traffic) and is controlled by the SMF 935.

The PCFs 940 and 941 are NFs that manage operator policies (PLMNs) for providing services in wireless communication systems. Additionally, the PCF may be divided into a PCF 940 in charge of an access and mobility (AM) policy and a UE policy and a PCF 941 in charge of a session management (SM) policy. The PCF 940 and the PCF 941 may be logically or physically separated NFs, or logically or physically one NF.

The UDM 945 is an NF that stores and manages subscriber information (UE subscription) of the terminal 900.

The UDR 950 is an NF or database (DB) that stores and manages data.

The UDR 950 may store subscription information of the terminal 900 and provide subscription information of the terminal 900 to the UDM 945. In addition, the UDR 950 may store operator policy information and provide operator policy information to the PCFs 940 and 941.

The NSSF 960 may be an NF that selects network slice instances serving the terminal 900 or determines network slice selection assistance information (NSSAI).

The AUSF 965 may be an NF that performs a function to support authentication for 3GPP access and non-3GPP access.

The AAA (authentication, authorization and accounting, 980) server may be a server in charge of network slice authentication. The AAA 980 server is connected to the AUSF 965 to perform network slice authentication.

The AF 970 may be an NF that provides a function for a service according to the present disclosure.

The DN 975 may refer to a data network capable of providing a service provider service, Internet access, or a third party service.

10 illustrates a terminal registration procedure in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 10, in step 1010, the terminal 900 may construct a registration request message and transmit it to the base station 910. According to an embodiment, the registration request message may include a requested NSSAI (NSSAI). The requested NSSAI (requested NSSAI) may include information on a network slice to which the terminal intends to access. The requested NSSAI (requested NSSAI) may be composed of one or more S-NSSAIs.

In step 1012, the base station 910 may select the AMF 920.

In step 1014, the base station 910 may transmit a registration request message to the selected AMF 920. The registration request message may include a requested NSSAI (NSSAI).

In step 1016, the AMF 920 may request terminal subscription data from the UDM 945.

In step 1018, the UDM 945 may transmit a response to the terminal subscription information request to the AMF 920. The terminal subscription information request response message may include subscription information. Subscription information, S-NSSAI (subscribed S-NSSAIs) to which the terminal 900 subscribes, an indicator indicating whether the S-NSSAI is the default S-NSSAI (default S-NSSAI), and the S-NSSAI is network slice specific It may include an indicator indicating whether it is a target for authentication and authorization (network slice-specific authentication and authorization, NSSAA). In addition, the subscription information is the authentication status information of the S-NSSAI targeting NSSAA (e.g., pending, authorized, unauthorized, authenticated, and unauthenticated ( unauthenticated), success, failure, etc.).

Based on the requested NSSAI (requested NSSAI) received from the terminal 900 and the subscription information received from the UDM 945, the AMF 920 may determine the allowed NSSAI (allowed NSSAI) available to the terminal 900. have. For example, if the S-NSSAI included in the requested NSSAI (requested NSSAI) is an NSSAA target and there is no authentication status information or is pending, the AMF 920 performs the NSSAA authentication procedure with the S-NSSAI. It can be added as a pending NSSAI (pending NSSAI). Or, for example, while the S-NSSAI included in the requested NSSAI (requested NSSAI) is the target of NSSAA, the authentication status is authentication success (e.g., authorized, authenticated, successful) Etc.), the AMF 920 may add the S-NSSAI as allowed NSSAI (NSSAI). Or, for example, while the S-NSSAI included in the requested NSSAI (requested NSSAI) is an NSSAA target, the authentication status is authentication failure (e.g., unauthorized, unauthenticated, failure ( failure), etc.), the AMF 920 may add the S-NSSAI as a rejected S-NSSAI (S-NSSAI).

In step 1020, the AMF 920 may transmit a registration accept message to the terminal 900. The registration accept message may include a pending NSSAI (NSSAI).

In step 1022, the AMF 920 may start the NSSAA procedure for the S-NSSAI included in the pending NSSAI (Pending NSSAI). For example, the S-NSSAI included in the pending NSSAI (Pending NSSAI) may be an S-NSSAI that is an NSSAA target among S-NSSAIs included in the requested NSSAI (requested NSSAI). The AMF 920 may trigger to perform NSSAA procedure.

In step 1024, the AMF 920 may complete a network slice-specific authentication and authorization (NSSAA) procedure for each S-NSSAI started in step 1022. The AMF 920 is the NSSAA result of each S-NSSAI (e.g., pending, authorized, unauthorized, authenticated, unauthenticated), success ( success), failure, etc.) may be stored as a UE context.

In step 1025a, the AMF 920 may perform subscription data update. The AMF 920 is the NSSAA result of each S-NSSAI performed in step 1024 (e.g., pending, authorized, unauthorized, authenticated, unauthenticated) (unauthenticated), success, failure, etc.) may be transmitted to the UDM 945. For example, the AMF 920, the NSSAA progress or results of each S-NSSAI (e.g., pending, authorized), not authorized (unauthorized) during the NSSAA procedure of step 1024 , Authenticated (authenticated), unauthenticated (unauthenticated), success (success), it may transmit a message of step 1025a including the failure (failure)). Alternatively, the AMF 920 is the NSSAA result of each S-NSSAI (e.g., authorized, unauthorized, authenticated, authenticated) after the NSSAA procedure of step 1024 is completed. A message of step 1025a including (unauthenticated), success, failure, etc.) may be transmitted.

Alternatively, in step 1025b, the AUSF 965 may perform subscription data update. The AUSF 965 is the NSSAA result of each S-NSSAI performed in step 1024 (e.g., pending, authorized, unauthorized, authenticated, unauthenticated) (unauthenticated), success, failure, etc.) may be transmitted to the UDM 945. For example, the AUSF 965 is the NSSAA progress or result of each S-NSSAI (e.g., pending, authorized, unauthorized) during the NSSAA procedure of step 1024. , Authenticated (authenticated), unauthenticated (unauthenticated), success (success), it may transmit a message of step 1025b including the failure (failure). Alternatively, the AUSF 965 is the NSSAA result of each S-NSSAI (e.g., authorized, unauthorized, authenticated, authenticated) after the NSSAA procedure of step 1024 is completed. A message of step 1025b including (unauthenticated), success, failure, etc.) may be transmitted.

UDM 945 is the NSSAA result of each S-NSSAI received from the AMF 920 or AUSF 965 in step 1025a or step 1025b (e.g., pending, authorized, not approved ( unauthorized), authenticated (authenticated), unauthenticated (unauthenticated), success (success), failure (failure)) can be stored as terminal subscription information.

In step 1026, the AMF 920 may determine an allowed NSSAI (NSSAI) based on the NSSAA result performed in step 1024. The AMF 920 may determine/update allowed NSSAI.

In one embodiment, if the result of the NSSAA procedure of S-NSSAI included in the pending NSSAI (pending NSSAI) performed in step 1024 is authentication success or there is an S-NSSAI that can be allowed to the terminal 900, AMF 920 ) May include the S-NSSAI for which NSSAA authentication has succeeded or the S-NSSAI allowed to the terminal 900 in the allowed NSSAI (NSSAI). When there is an S-NSSAI to be included in the allowed NSSAI (NSSAI) as described above, the AMF 920 may transmit a UE configuration update command message to the terminal 900 in step 1028a. The UE configuration update command message may include allowed NSSAI (NSSAI). The terminal 900 receiving the UE configuration update command message can use the S-NSSAI included in the allowed NSSAI (allowed NSSAI) included in the UE configuration update command message. have.

In one embodiment, if the result of the NSSAA procedure of the S-NSSAI included in the pending NSSAI (pending NSSAI) performed in step 1024 is authentication failure or there is no S-NSSAI that can be allowed to the terminal 900, AMF 920 ) May determine that there is no network slice that can be provided to the terminal 900. If there is no S-NSSAI to be provided as such allowed NSSAI (allowed NSSAI), the AMF 920 sends a network-initiated deregistration message or registration rejection to the terminal 900 in step 1028b. You can send a message. Upon receiving a network-initiated deregistration message or a registration reject message, the terminal 900 may determine that there is no currently available network slice.

The terminal 900 according to the embodiment of the present invention may register with the network through another access network. The first base station 910 and the second base station 1001 to which the terminal is connected are different access networks (e.g., 3GPP access network, non-3GPP access network, N3IWF Etc.).

In step 1030, the terminal 900 may construct a registration request message and transmit it to the second base station 1001. According to an embodiment, the registration request message may include a requested NSSAI (NSSAI). The requested NSSAI (requested NSSAI) may include information on a network slice to which the terminal intends to access. The requested NSSAI (requested NSSAI) may be composed of one or more S-NSSAIs.

In step 1032, the second base station 1001 may transmit a registration request message to the selected second AMF 1000. The registration request message may include a requested NSSAI (NSSAI).

In step 1034, the second AMF (1000) may request the terminal subscription information (subscription data) from the UDM (945).

In step 1036, the UDM 945 may transmit a response to the request for terminal subscription information to the second AMF 1000. The terminal subscription information request response message may include subscription information. Subscription information is S-NSSAI (subscribed S-NSSAIs) to which the terminal 900 subscribes, an indicator indicating whether the S-NSSAI is the default S-NSSAI (default S-NSSAI), and the S-NSSAI is the NSSAA (network It may include an indicator indicating whether the target is a slice-specific authentication and authorization). In addition, the subscription information is the authentication status information of the S-NSSAI targeting NSSAA (e.g., pending, authorized, unauthorized, authenticated, and unauthenticated ( unauthenticated), success, failure, etc.). The authentication status information of the S-NSSAI subject to the NSSAA may be information received and stored by the UDM 945 from the first AMF 920 or the AUSF 965 in step 1025a or 1025b. In addition, the subscription information may include information indicating that authentication of the S-NSSAI targeting NSSAA is currently in progress (eg, an indicator indicating that authentication of the S-NSSAI targeting NSSAA is currently in progress). The second AMF (1000) is the NSSAA result of each S-NSSAI received from the UDM (945) (e.g., pending (pending), authorized (authorized), unauthorized (unauthorized), authenticated (authenticated)), Unauthenticated (unauthenticated), success (success), failure (failure), etc.) can be stored in the UE context (UE context).

In step 1038, the second AMF 1000 based on the requested NSSAI (requested NSSAI) received from the terminal 900 and the subscription information received from the UDM 945, the allowed NSSAI ( allowed NSSAI) can be determined. For example, if the S-NSSAI included in the requested NSSAI (requested NSSAI) is an NSSAA target, and there is no authentication status information in the subscription information, or the authentication status included in the subscription information is pending, the second AMF ( 1000) may add the S-NSSAI as a pending NSSAI (pending NSSAI) to perform the NSSAA authentication procedure. In addition, based on the subscription information (for example, if the information indicating that the authentication of the S-NSSAI targeting NSSAA is currently in progress is included), the second AMF 1000 pending the corresponding S-NSSAI NSSAI (pending NSSAI), but authentication is in progress in another AMF (ie, the first AMF), and thus, the second AMF 1000 may not perform authentication of the corresponding S-NSSAI. Or, for example, while the S-NSSAI included in the requested NSSAI (requested NSSAI) is an NSSAA target, the authentication status included in the subscription information is authentication successful (eg, authorized, authenticated) , Success, etc.), the second AMF 1000 may add the S-NSSAI as allowed NSSAI (NSSAI). Or, for example, while the S-NSSAI included in the requested NSSAI (requested NSSAI) is an NSSAA target, the authentication status included in the subscription information is authentication failure (e.g., unauthorized, unauthenticated ( unauthenticated), failure, etc.), the AMF 920 may add the S-NSSAI as a rejected S-NSSAI (S-NSSAI). That is, because the NSSAA authentication of the S-NSSAI has already been performed in step 1024, or because the first AMF 920 is currently performing step 1024, the second AMF 1000 is again authenticated. May not need to be performed. The second AMF 1000 may use the NSSAA authentication result stored in the UDM 945 by the first AMF 920 or the AUSF 965.

In step 1040, the AMF 920 may transmit a registration accept message to the terminal 900. The registration accept message may include an allowed NSSAI (allowed NSSAI) and/or a rejected S-NSSAI (rejected S-NSSAI) determined in step 1038 by the second AMF 1000.

11 illustrates a re-authentication procedure in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 11, in step 1110, the AAA 980 server or the AMF 920 according to various embodiments of the present disclosure performs network slice-specific re-authentication and re-authorization. You can do it. The AAA 980 server or the AMF 920 according to various embodiments of the present disclosure may re-authenticate the S-NSSAI performed in step 1024 of FIG. 10. For example, the AAA 980 server or the AMF 920 may revoke the success of NSSAA authentication performed in step 1024 by performing re-authentication in step 1110 for the S-NSSAI that succeeded in NSSAA in step 1024. . The AMF 920 may update the NSSAA result stored in the UE context. For example, for S-NSSAI in which authentication succeeds in step 1024 and the NSSAA result is saved as success, if authentication is revoked in step 1110, the NSSAA result of S-NSSAI saved as success is updated to failure. I can.

In step 1112a, the AMF 920 may perform a terminal subscription information update. The AMF 920 is the NSSAA result of each S-NSSAI performed in step 1110 (e.g., pending, authorized, unauthorized, authenticated, unauthenticated) (unauthenticated), success, failure, etc.) may be transmitted to the UDM 945. For example, the AMF 920, during the NSSAA procedure of step 1110, the NSSAA progress or results of each S-NSSAI (e.g., pending, authorized, unauthorized) , Authenticated, unauthenticated, success, failure, etc.). Alternatively, the AMF 920 is the NSSAA result of each S-NSSAI (e.g., authorized, unauthorized, authenticated, authenticated) after the NSSAA procedure of step 1110 is completed. A message of step 1112a including (unauthenticated), success, failure, etc.) may be transmitted.

As another method, in step 1112b, the AUSF 965 may perform a terminal subscription information update. The AUSF 965 is the NSSAA result of each S-NSSAI performed in step 1110 (e.g., pending, authorized, unauthorized, authenticated, unauthenticated) (unauthenticated), success, failure, etc.) may be transmitted to the UDM 945. For example, the AUSF 965, during the NSSAA procedure of step 1110, the NSSAA progress or results of each S-NSSAI (e.g., pending, authorized, unauthorized) , Authenticated (authenticated), unauthenticated (unauthenticated), success (success), it may transmit a message of step 1112b including the failure (failure). Alternatively, the AUSF 965 is the NSSAA result of each S-NSSAI (e.g., authorized, unauthorized, authenticated, authenticated) after the NSSAA procedure of step 1110 is completed. A message of step 1112b including (unauthenticated), success, failure, etc.) may be transmitted.

UDM 945 is the NSSAA result of each S-NSSAI received from the AMF 920 or AUSF 965 in step 1110a or 1110b (e.g., pending, authorized, not approved ( Unauthorized), authenticated (authenticated), unauthenticated (unauthenticated), success (success), failure (failure) according to the terminal subscription information can be updated.

In step 1114, the AMF 920 may determine/update the allowed NSSAI (NSSAI) based on the result of the NSSAA whose authentication is revoked in step 1110.

In one embodiment, when there is an S-NSSAI to be provided to the terminal as allowed NSSAI (allowed NSSAI), the AMF 920 transmits a UE configuration update command message to the terminal 900 in step 1116a. I can. The UE configuration update command message may include allowed NSSAI (NSSAI). The terminal 900 receiving the UE configuration update command message can use the S-NSSAI included in the allowed NSSAI (allowed NSSAI) included in the UE configuration update command message. have.

In one embodiment, if there is no S-NSSAI to be provided as allowed NSSAI (allowed NSSAI), the AMF 920 may transmit a network-initiated deregistration message to the terminal 900 in step 1116b. . Upon receiving the network-initiated deregistration message, the terminal 900 may determine that there is no currently available network slice.

NSSAA results of each S-NSSAI received from the first AMF 920 or AUSF 965 in step 1110a or 1110b (e.g., pending, authorized, unauthorized, UDM 945, which updated the terminal subscription information according to authenticated, unauthenticated, success, failure, etc.), when the NSSAA result of S-NSSAI is changed (e.g. For example, change from authentication to non-authentication, change from non-authentication to authentication, from authentication to pending, etc.), in step 1118, a change in NSSAA result information of S-NSSAI may be notified to the second AMF (1000). . In step 1118, the UDM 945 may transmit a subscription notification message to the second AMF 1000. The message of step 1118 is the NSSAA result of S-NSSAI (e.g., pending, authorized, unauthorized, authenticated, unauthenticated), success ( success), failure, etc.). In addition, the subscription information may include information indicating that authentication of the S-NSSAI targeting NSSAA is currently in progress (eg, an indicator indicating that authentication of the S-NSSAI targeting NSSAA is currently in progress). The second AMF 1000 is the NSSAA result of each S-NSSAI received from the UDM 945 (e.g., pending, authorized, unauthorized, authenticated, The UE context stored by the second AMF 1000 may be updated according to unauthenticated (unauthenticated), success, failure, etc.).

Before step 1118 (eg, during the registration procedure shown in FIG. 10 ), the second AMF 1000 may transmit an event subscription request message to the UDM 945 for a change in the NSSAA result of the S-NSSAI. The UDM 945 may transmit a notification message about a change in the NSSAA result of the S-NSSAI in step 1118 to the second AMF 1000 based on the event subscription requested from the second AMF 1000.

In step 1120, the second AMF 1000 may determine/update an allowed NSSAI (NSSAI) available to the terminal 900 based on the information received from the UDM 945 in step 1118. That is, since the NSSAA authentication of the S-NSSAI has already been performed by the first AMF 920 in step 1110, it may not be necessary for the second AMF 1000 to perform authentication again. The second AMF 1000 may use the NSSAA authentication result stored in the UDM 945 by the first AMF 920 or the AUSF 965.

In one embodiment, when there is an S-NSSAI to be provided as an allowed NSSAI (NSSAI) allowed to the terminal, the second AMF 1000 sends a UE configuration update command message to the terminal 900 in step 1122a. Can be transmitted. The UE configuration update command message may include allowed NSSAI (NSSAI). The terminal 900 receiving the UE configuration update command message can use the S-NSSAI included in the allowed NSSAI (allowed NSSAI) included in the UE configuration update command message. have.

In one embodiment, when there is no S-NSSAI to be provided as an allowed NSSAI (allowed NSSAI), the second AMF 1000 transmits a network-initiated deregistration message to the terminal 900 in step 1122b. I can. Upon receiving the network-initiated deregistration message, the terminal 900 may determine that there is no currently available network slice.

The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions for causing the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (electrically erasable programmable read only memory, EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs) or other forms of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is a communication network such as the Internet (Internet), Intranet (Intranet), LAN (local area network), WAN (wide area network), or SAN (storage area network), or a communication network composed of a combination thereof. It may be stored in an accessible storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

In the above-described specific embodiments of the present disclosure, components included in the disclosure are expressed in the singular or plural according to the presented specific embodiments. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications may be made without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure is limited to the described embodiments and should not be defined, and should be determined by the scope of the claims and equivalents as well as the scope of the claims to be described later.

Claims (2)

In a method of operating a first access and mobility management function (AMF) network node in a wireless communication system,
Receiving an uplink remote interference management information transfer message including information on a second base station not connected to the first AMF from a first base station connected to the first AMF, and
A process of selecting a second AMF connected to the second base station based on the information on the second base station, and
Transmitting a message transmission request message to the second AMF,
Receiving a message transmission response message from the second AMF,
And transmitting an uplink remote interference management information transfer response message to the first base station.
In a first AMF (access and mobility management function) network node in a wireless communication system,
At least one transceiver; And
It includes at least one processor,
The at least one processor,
Receiving an uplink remote interference management information transfer message including information on a second base station not connected to the first AMF from a first base station connected to the first AMF,
Selecting a second AMF connected to the second base station based on the information on the second base station,
Transmitting a message transmission request message to the second AMF,
Receiving a message transmission response message from the second AMF,
An apparatus configured to transmit an uplink remote interference management information transfer response message to the first base station.

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