5G NRF服务注册发现与状态通知拆解

graph TB
    subgraph "NRF服务架构"
        NRF["NRF<br/>网络存储功能"]

        subgraph "Nnrf_NFManagement"
            REG["NF注册/注销<br/>PUT/DELETE"]
            HB["心跳更新<br/>PATCH"]
            SUB["状态订阅<br/>POST"]
            NTY["状态通知<br/>POST callback"]
        end

        subgraph "Nnrf_NFDiscovery"
            DISC["NF发现<br/>GET"]
        end
    end

    AMF -->|"注册/心跳"| REG
    SMF -->|"注册/心跳"| REG
    UDM -->|"注册/心跳"| REG
    PCF -->|"注册/心跳"| REG
    AUSF -->|"注册/心跳"| REG

    AMF -->|"发现SMF"| DISC
    SMF -->|"发现PCF"| DISC
    SMF -->|"发现UDM"| DISC

    AMF -->|"订阅SMF状态"| SUB
    NTY -->|"通知AMF"| AMF

    REG --> NRF
    HB --> NRF
    DISC --> NRF
    SUB --> NRF
    NTF --> NRF

sequenceDiagram
    participant NF as NF实例<br/>(如AMF/SMF/UDM)
    participant NRF as NRF

    Note over NF,NRF: Step 1: NF启动，向NRF发起注册
    NF->>NRF: PUT /nnrf-nfm/v1/nf-instances/{nfInstanceID}<br/>Content-Type: application/json<br/>Body: NFProfile (JSON)

    Note over NRF: 验证NFProfile完整性<br/>检查NF授权<br/>存储NFProfile

    NRF-->>NF: 201 Created<br/>Body: {nfInstanceId, nfStatus, heartBeatTimer}<br/>或 200 OK (更新已有注册)

    Note over NF,NRF: Step 2: 周期性心跳
    loop 每隔heartBeatTimer秒
        NF->>NRF: PATCH /nnrf-nfm/v1/nf-instances/{nfInstanceID}<br/>Body: {load: xx} 或空JSON
        NRF-->>NF: 200 OK

        Note over NRF: 重置心跳计时器
    end

    Note over NRF: 心跳超时处理
    Note over NRF: heartBeatTimer超时 × 2~3次<br/>→ 标记NF为SUSPENDED<br/>→ 通知所有订阅者

{
    "nfInstanceId": "0ab51768-ffcd-41ec-a11e-7954f71c156f",
    "nfType": "AMF",
    "nfStatus": "REGISTERED",
    "ipv4Addresses": ["127.0.0.5"],
    "allowedNfTypes": ["SMF"],
    "priority": 0,
    "capacity": 100,
    "load": 0,
    "nfServices": [{
        "serviceInstanceId": "0ab6167c-ffcd-41ec-a11e-7954f71c156f",
        "serviceName": "namf-comm",
        "versions": [{"apiVersionInUri": "v1", "apiFullVersion": "1.0.0"}],
        "scheme": "http",
        "nfServiceStatus": "REGISTERED",
        "ipEndPoints": [{"ipv4Address": "127.0.0.5", "port": 7777}],
        "allowedNfTypes": ["SMF"],
        "priority": 0,
        "capacity": 100,
        "load": 0
    }],
    "nfProfileChangesSupportInd": true
}

sequenceDiagram
    participant AMF as AMF<br/>(服务消费者)
    participant NRF as NRF
    participant SMF as SMF<br/>(被发现的NF)

    Note over AMF: UE发起PDU Session Establishment<br/>AMF需要选择SMF

    AMF->>NRF: GET /nnrf-disc/v1/nf-instances?<br/>target-nf-type=SMF&<br/>requester-nf-type=AMF&<br/>target-plmn-list=46000&<br/>snssais=SST:1,SD:010203&<br/>dnn=internet&<br/>tai=460-00-000001&<br/>service-names=nsmf-pdusession

    Note over NRF: 1. 验证请求者AMF是否被授权发现SMF<br/>2. 按target-nf-type过滤<br/>3. 按snssais匹配SMF支持的切片<br/>4. 按dnn匹配SMF支持的DNN<br/>5. 按tai匹配SMF服务区域<br/>6. 按priority/capacity/load排序

    NRF-->>AMF: 200 OK<br/>Body: SearchResult {<br/>  nfInstances: [{<br/>    nfInstanceId: "smf-uuid-001",<br/>    nfType: "SMF",<br/>    fqdn: "smf1.mnc070.mcc460.3gppnetwork.org",<br/>    ipv4Addresses: ["10.0.1.5"],<br/>    nfServices: [{<br/>      serviceName: "nsmf-pdusession",<br/>      scheme: "https",<br/>      apiPrefix: "smf1",<br/>      ipEndPoints: [{ipv4Address: "10.0.1.5", port: 8443}]<br/>    }]<br/>  }]<br/>}

    Note over AMF: 选择最优SMF实例
    AMF->>SMF: POST /nsmf-pdusession/v1/sm-contexts<br/>(PDU Session Establishment)

选择分数 = f(priority, capacity, load)

sequenceDiagram
    participant AMF as AMF<br/>(订阅者)
    participant NRF as NRF
    participant SMF as SMF<br/>(被监控的NF)
    participant PCF as PCF<br/>(另一订阅者)

    Note over AMF,NRF: Step 1: AMF订阅SMF状态变更
    AMF->>NRF: POST /nnrf-nfm/v1/subscriptions<br/>Body: {<br/>  "nfStatusNotificationUri": "https://amf1/callback",<br/>  "subscrCond": {<br/>    "nfType": "SMF"<br/>  },<br/>  "reqNotifEvents": ["NF_REGISTERED", "NF_DEREGISTERED"],<br/>  "plmnId": {"mcc": "460", "mnc": "00"}<br/>}

    NRF-->>AMF: 201 Created<br/>Body: {subscriptionId: "sub-001"}

    Note over PCF,NRF: Step 2: PCF也订阅SMF状态变更
    PCF->>NRF: POST /nnrf-nfm/v1/subscriptions<br/>(类似内容)
    NRF-->>PCF: 201 Created {subscriptionId: "sub-002"}

    Note over SMF,NRF: Step 3: 新SMF注册
    SMF->>NRF: PUT /nnrf-nfm/v1/nf-instances/{smf-new-uuid}<br/>Body: {nfType: SMF, ...}
    NRF-->>SMF: 201 Created

    Note over NRF: Step 4: NRF通知所有订阅者
    NRF->>AMF: POST https://amf1/callback<br/>Body: {<br/>  "event": "NF_REGISTERED",<br/>  "nfInstance": {完整SMF NFProfile}<br/>}
    AMF-->>NRF: 204 No Content

    NRF->>PCF: POST https://pcf1/callback<br/>(同样内容)
    PCF-->>NRF: 204 No Content

    Note over SMF,NRF: Step 5: SMF心跳超时，被隐式注销
    Note over NRF: 心跳超时 × N次<br/>→ 标记NF为SUSPENDED

    NRF->>AMF: POST https://amf1/callback<br/>Body: {<br/>  "event": "NF_DEREGISTERED",<br/>  "nfInstanceId": "smf-new-uuid"<br/>}
    AMF-->>NRF: 204 No Content

stateDiagram-v2
    [*] --> REGISTERED: PUT NFRegister<br/>(nfStatus=REGISTERED)

    REGISTERED --> REGISTERED: PATCH Heartbeat<br/>(心跳正常)

    REGISTERED --> SUSPENDED: 心跳超时<br/>(heartBeatTimer × N)

    REGISTERED --> UNDISCOVERABLE: PATCH<br/>(nfStatus=UNDISCOVERABLE)

    SUSPENDED --> REGISTERED: PATCH Heartbeat<br/>(恢复心跳)

    UNDISCOVERABLE --> REGISTERED: PATCH<br/>(nfStatus=REGISTERED)

    REGISTERED --> [*]: DELETE NFDeregister<br/>(显式注销)
    SUSPENDED --> [*]: NRF清理<br/>(超时清理)

# 过滤NRF相关HTTP/2流量（假设NRF端口为8443）
tcp port 8443

# Wireshark HTTP/2过滤器
http2.headers.path contains "nnrf-nfm" or http2.headers.path contains "nnrf-disc"

sequenceDiagram
    participant AMF as AMF
    participant NRF as NRF
    participant SMF as SMF

    rect rgb(230, 245, 255)
    Note over AMF,SMF: 阶段1: AMF启动注册
    AMF->>NRF: PUT /nnrf-nfm/v1/nf-instances/{amf-uuid}<br/>{nfType:AMF, nfServices:[namf-comm], ...}
    NRF-->>AMF: 201 Created {heartBeatTimer: 30}
    end

    rect rgb(230, 255, 230)
    Note over AMF,SMF: 阶段2: SMF启动注册
    SMF->>NRF: PUT /nnrf-nfm/v1/nf-instances/{smf-uuid}<br/>{nfType:SMF, sNssais:[SST:1], dnnList:[internet], ...}
    NRF-->>SMF: 201 Created {heartBeatTimer: 30}
    end

    rect rgb(255, 245, 230)
    Note over AMF,SMF: 阶段3: AMF订阅SMF状态
    AMF->>NRF: POST /nnrf-nfm/v1/subscriptions<br/>{subscrCond:{nfType:SMF}, ...}
    NRF-->>AMF: 201 Created {subscriptionId: sub-001}
    end

    rect rgb(255, 230, 230)
    Note over AMF,SMF: 阶段4: UE触发PDU Session，AMF发现SMF
    AMF->>NRF: GET /nnrf-disc/v1/nf-instances?<br/>target-nf-type=SMF&snssais=SST:1&dnn=internet
    NRF-->>AMF: 200 OK {[smf-uuid, fqdn:smf1, ip:10.0.1.5]}
    AMF->>SMF: POST /nsmf-pdusession/v1/sm-contexts
    SMF-->>AMF: 201 Created {smContextRef}
    end

    rect rgb(240, 230, 255)
    Note over AMF,SMF: 阶段5: 周期性心跳维持
    loop 每30秒
        AMF->>NRF: PATCH /nnrf-nfm/v1/nf-instances/{amf-uuid}<br/>{load: 25}
        NRF-->>AMF: 200 OK
        SMF->>NRF: PATCH /nnrf-nfm/v1/nf-instances/{smf-uuid}<br/>{load: 40}
        NRF-->>SMF: 200 OK
    end
    end