<!-- title: 5G鏍稿績缃慡MF閫夋嫨鏈哄埗鎷嗚В -->
<!-- domain: core-network -->

# 5G鏍稿績缃慡MF閫夋嫨鏈哄埗鍏ㄩ摼鎷嗚В

## 涓�銆佷负浠�涔�"SMF閫夋嫨"鏄�5G鏍稿績缃戞帶鍒堕潰鐨勭涓�閬撳垎姘村箔

鍦�4G EPC涓紝PDN杩炴帴鐢盡ME鏍规嵁APN鐩存帴鏌NS銆侀�夊畾涓�涓猄GW/PGW鍏冪粍锛岃矾寰勭浉瀵圭嚎鎬с�傝��5GC閲囩敤鏈嶅姟鍖栨灦鏋勶紙SBA锛変箣鍚庯紝**浼氳瘽绠＄悊鍔熻兘锛圫MF锛変粠閫昏緫涓婅鍓ョ鍑虹Щ鍔ㄦ�х鐞嗗疄浣擄紙AMF锛�**锛屽苟涓斿洜涓哄紩鍏ヤ簡缃戠粶鍒囩墖锛圢etwork Slicing锛夈�佹暟鎹綉缁滃悕锛圖NN锛夈�佸垏鐗囧疄渚嬫爣璇嗭紙NSI-ID锛夊拰杈圭紭璁＄畻锛圖NAI锛夌瓑澶氶噸姝ｄ氦缁村害锛�"涓轰竴鏉DU浼氳瘽閫夎皝褰揝MF"鍙樻垚浜嗕竴涓�**澶氱害鏉熸潯浠剁殑缁勫悎浼樺寲闂**銆�

3GPP TS 23.501 绗�6.3.2鏉★紙Selection of SMF锛夊拰 TS 29.510 绗�5.3鏉★紙Nnrf_NFDiscovery锛夊叡鍚屽畾涔変簡杩欏鏈哄埗銆傜悊瑙ｅ畠鐨勯噸瑕佹�у湪浜庯細

- **瀹冩槸PDU浼氳瘽寤虹珛锛圱S 23.502 搂4.3.2.2锛夌殑绗�3姝�**锛岄�夐敊SMF鎴栭�変笉鍒癝MF锛屾暣鏉＄敤鎴烽潰寤洪摼鐩存帴澶辫触锛�
- **瀹冩槸鍒囩墖闅旂鍦ㄦ帶鍒堕潰鐨勮惤鍦板姩浣�**鈥斺�斿悓涓�S-NSSAI涓嬩笉鍚孨SI-ID浼氳璺敱鍒板畬鍏ㄤ笉鍚岀殑SMF闆嗗悎锛�
- **瀹冩槸婕父銆佽竟缂樿绠椼�佸崼鏄熸帴鍏ワ紙Rel-17/18锛夌瓑楂樼骇鐗规�х殑鎵块噸鐐�**銆�

鏈枃鑱氱劍"UE鍙戣捣PDU浼氳瘽寤虹珛鏃禔MF濡備綍瀹屾垚SMF閫夋嫨"杩欎竴鍏蜂綋淇′护閾捐矾锛岄�愪竴鎷嗚В鍏抽敭IE銆佽璁℃剰鍥句笌鎺掗敊鏂规硶銆�

## 浜屻�佽璁℃剰鍥撅細涓轰粈涔堜笉璁〢MF闈欐�侀厤缃甋MF

5G鏍稿績缃戝湪SMF閫夋嫨涓婂埢鎰忔斁寮冧簡4G鏃朵唬"APN鈫掑浐瀹歅GW"鐨勭‖缁戝畾锛岃浆鑰岄噰鐢�**"璁㈤槄鏁版嵁/NSSF寮曞 + NRF鍔ㄦ�佸彂鐜�"**鐨勬贩鍚堟ā寮忋�傝繖鏍疯璁℃湁涓夊眰鎰忓浘锛�

1. **瑙ｈ�﹂儴缃蹭笌杩愯**锛歋MF鍙互闅忓閲忓脊鎬ф墿缂╋紝杩愮淮渚у彧瑕佸湪NRF娉ㄥ唽鏂板疄渚嬶紝AMF鏃犻渶鏀归厤缃嵆鍙劅鐭ャ��
2. **鍒囩墖绾ч殧绂�**锛氶�氳繃S-NSSAI + NSI-ID鎶婁笉鍚岀鎴�/涓嶅悓SLA鐨勪細璇濋拤姝诲湪鍚勮嚜鐨凷MF姹犻噷锛岀墿鐞嗕笂闅旂鏁呴殰鍩熴��
3. **灏辫繎/璐熻浇鍧囪　**锛氬埄鐢∟RF杩斿洖鐨凬FProfile涓殑璐熻浇銆佸閲忋�佹嫇鎵戜俊鎭紝AMF鍙湪澶氫釜鍊欓�塖MF闂村仛鍔犳潈閫夋嫨锛岃�岄潪闅忔満銆�

## 涓夈�侀�夋嫨鐨勮緭鍏ュ弬鏁板叏鏅�

SMF閫夋嫨鏈川鏄嚱鏁� `SelectSMF(DNN, S-NSSAI, NSI-ID, PLMN, UE浣嶇疆, 璁㈤槄) 鈫� SMF瀹炰緥`銆備笅琛ㄦ槸TS 23.501 搂6.3.2涓嶵S 29.510 搂5.3.2.2涓畾涔夌殑鍏抽敭杈撳叆IE锛�

| 鍙傛暟 | 鏉ユ簮 | 浣滅敤 | 鏄惁蹇呴�� |
|------|------|------|----------|
| DNN锛圖ata Network Name锛� | UE鍦∟AS璇锋眰涓惡甯︼紝鎴栫敱AMF鎸夎闃呰ˉ鍏� | 鏍囪瘑鐩爣鏁版嵁缃戠粶锛岀浉褰撲簬4G APN | 閫変細璇濇椂閫氬父蹇呴�夛紱鐪佺暐鏃惰蛋榛樿DNN |
| S-NSSAI | UE NAS璇锋眰 / AMF鍏佽鍒囩墖 | 鍒囩墖绫诲瀷+鍒囩墖鍖哄垎绗︼紝绗竴閬撹繃婊� | 蹇呴�� |
| NSI-ID锛圢etwork Slice Instance ID锛� | NSSF杩斿洖锛圢nssai_Selection锛� | 鍦ㄥ悓涓�S-NSSAI鐨勫瀹炰緥闂翠簩閫変竴 | 鍙�夛紝閮ㄧ讲澶氬疄渚嬫椂浣跨敤 |
| SMF Set ID | NRF NFProfile.nfSetId | 鍦ㄤ竴涓�昏緫SMF闆嗗悎鍐呰礋杞藉潎琛�/鍐椾綑 | 鍙�� |
| PLMN ID | UE涓婁笅鏂� | 婕父鍦烘櫙涓嬪尯鍒咹PLMN/VPLMN鐨凷MF | 婕父蹇呴�� |
| SMF Service Area / TAI List | NRF NFProfile.smfInfo.taiList | 鎸塙E褰撳墠浣嶇疆鍋氭嫇鎵戝氨杩� | 鍙�夛紝杈圭紭/鏈湴鍒嗘祦鏃跺叧閿� |
| SM璁㈤槄鏁版嵁 | UDM锛圢udm_SDM_Get锛� | 鏍￠獙DNN/S-NSSAI鏄惁绛剧害銆丼SC妯″紡銆侀粯璁NN | 蹇呴�� |

## 鍥涖�佷袱绉嶉�夋嫨妯″紡锛氳嚜鎰块�夋嫨涓庨粯璁ら�夋嫨

TS 23.501 搂6.3.2鏄庣‘鍖哄垎涓ょ瑙﹀彂妯″紡锛岃繖鏄帓閿欐椂鏈�瀹规槗娣锋穯鐨勭偣锛�

- **鑷効SMF閫夋嫨锛圴oluntary SMF selection锛�**锛歎E鍦≒DU浼氳瘽寤虹珛璇锋眰涓�**鏄惧紡鎻愪緵浜咲NN锛堟垨S-NSSAI锛�**锛孉MF鎹璋冪敤NRF鍋氬姩鎬佸彂鐜般�傝繖鏄渶甯歌鐨処nternet/浼佷笟涓撶嚎鍦烘櫙銆�
- **榛樿SMF閫夋嫨锛圖efault SMF selection锛�**锛歎E**娌℃湁鎻愪緵DNN**锛孉MF浠嶶DM鍙栧洖鐨凷M璁㈤槄鏁版嵁閲屾壘鍒拌S-NSSAI瀵瑰簲鐨�"榛樿DNN"锛屽啀璧伴�夋嫨娴佺▼銆傚父鐢ㄤ簬UE棣栨闄勭潃涓�涓垏鐗囦絾灏氭湭鎸囧畾鏁版嵁缃戠粶鐨勬儏褰€��

```mermaid
flowchart TD
    A["UE: PDU Session Establishment Request<br/>(鍚獶NN?)"] --> B{NAS璇锋眰涓�<br/>鏄惁鍚獶NN?}
    B -- "鏄�" --> C["鑷効SMF閫夋嫨<br/>Voluntary"]
    B -- "鍚�" --> D["AMF鍚慤DM鍙朣M璁㈤槄<br/>Nudm_SDM_Get"]
    D --> E{"璁㈤槄涓槸鍚︽湁<br/>璇-NSSAI鐨勯粯璁NN?"}
    E -- "鏈�" --> F["榛樿SMF閫夋嫨<br/>Default"]
    E -- "鏃�" --> G["鎷掔粷寤虹珛<br/>鍘熷洜鍊�#27/28/29"]
    C --> H["AMF鈫扤RF<br/>Nnrf_NFDiscovery"]
    F --> H
    H --> I["NRF杩斿洖鍊欓�塖MF鍒楄〃<br/>鍚玁FProfile"]
    I --> J{"鍊欓�夋暟"}
    J -- "=1" --> K["鐩存帴閫夌敤"]
    J -- ">1" --> L["鎸夎礋杞�/瀹归噺/鎷撴墤鍔犳潈閫夋嫨"]
    J -- "=0" --> M["閫夋嫨澶辫触<br/>瑙﹀彂slice/DNN鏍￠獙"]
    K --> N["AMF鈫扴MF<br/>CreateSMContext"]
    L --> N
```

## 浜斻�佸畬鏁翠俊浠ゆ椂搴忓浘锛圱S 23.502 搂4.3.2.2 绗�3鈥�11姝ワ級

涓嬪浘涓ユ牸瀵归綈TS 23.502绗�4.3.2.2鏉′腑SMF閫夋嫨鐩稿叧鐨勬楠わ紙姝ラ1鈥�2鏄疷E鈫扐MF鐨凬AS閫忎紶涓嶢MF鏌DM锛岃繖閲岃仛鐒﹂�夋嫨鍔ㄤ綔鏈韩锛夛細

```mermaid
sequenceDiagram
    participant UE
    participant AMF
    participant UDM
    participant NRF
    participant NSSF
    participant SMF
    participant UPF

    UE->>AMF: NAS: PDU Session Establishment Request<br/>(DNN, S-NSSAI, SSC mode, PDU Session ID)
    Note over AMF: 姝ラ2: AMF妫�鏌E鏄惁琚巿鏉冧娇鐢ㄨS-NSSAI
    AMF->>UDM: Nudm_SDM_Get (SUPI, DNN, S-NSSAI)<br/>鍙朣M璁㈤槄鏁版嵁
    UDM-->>AMF: DNN绛剧害/榛樿DNN, SSC, 5QI, 浼氳瘽AMBR
    alt 闇�瑕佸垏鐗囧疄渚嬪喅绛�
        AMF->>NSSF: Nnssf_NSSelection_Get<br/>(Allowed S-NSSAI, TAI, 鍒囩墖鍙傛暟)
        NSSF-->>AMF: NSI-ID鍒楄〃, 鍊欓�堿MF Set,<br/>鐢ㄤ簬NF鍙戠幇鐨凬RF鍦板潃
    end
    AMF->>NRF: Nnrf_NFDiscovery<br/>target-nf-type=SMF<br/>snssais, dnn, nsi-id, smf-set-id
    NRF-->>AMF: 鍊欓�塖MF NFProfile鍒楄〃<br/>(nfInstanceId, sNssaiSmfInfoList, taiList, capacity)
    Note over AMF: 姝ラ3: AMF鎵цSMF閫夋嫨绠楁硶
    AMF->>SMF: POST /nsmf-pdusession/v1/sm-contexts<br/>CreateSMContext (N1 SM Container, DNN, S-NSSAI)
    SMF-->>AMF: 201 Created (SM Context, PDU Session ID, Cause)
    Note over SMF: 姝ラ4: SMF閫夋嫨UPF (TS 23.501 搂6.3.3)
    SMF->>NRF: Nnrf_NFDiscovery target-nf-type=UPF<br/>(snssais, dnn, smf serving area)
    NRF-->>SMF: 鍊欓�塙PF NFProfile (upfInfo.sNssaiUpfInfoList)
    SMF->>UPF: N4 Session Establishment
    UPF-->>SMF: N4浼氳瘽寤虹珛鎴愬姛
    SMF->>AMF: Namf_Communication_N1N2MessageTransfer<br/>(N2 SM Info, N1 SM Accept)
    AMF->>UE: N2 PDU Session Resource Setup + NAS Accept
```

閫愭秷鎭叧閿甀E瑙ｆ瀽锛�

- **NAS PDU Session Establishment Request**锛圱S 24.501 搂8.3.14锛夛細`DNN`銆乣S-NSSAI`銆乣PDU session ID`銆乣Requested SSC mode`銆乣PDU session type`锛圛Pv4/IPv6/Ethernet/Unstructured锛夈��
- **Nudm_SDM_Get**锛欰MF鐢� `dataSetId=SM` 鎷夊彇 `SmfSelectionSubscriptionData`锛岄噷闈㈠寘鍚瘡涓猄-NSSAI鏀寔鐨凞NN鍒楄〃銆乣defaultDnnIndicator`銆乣sscModes`銆乣sessionAmbr`銆�
- **Nnrf_NFDiscovery 鏌ヨ涓�**锛氳繖鏄姄鍖呰瘑鍒殑"鎸囩汗"锛岃涓嬩竴鑺傘��
- **CreateSMContext锛圥OST /nsmf-pdusession/v1/sm-contexts锛�**锛歍S 29.502 搂5.1.2.11瀹氫箟锛宐ody鍚� `pduSessionId`銆乣dnn`銆乣snssai`銆乣n1SmMsg`銆乣servingNfId`(AMF)銆乣anType`銆乣ueLocation`銆乣n2SmInfoType`銆�

## 鍏�丯RF鍙戠幇娣卞害瑙ｆ瀽锛氭煡璇覆涓庤繑鍥炵殑NFProfile IE

SMF鍔ㄦ�佸彂鐜版槸鏁翠釜鏈哄埗鐨�"鍐呮牳"銆侫MF鍚慛RF鍙戣捣鐨勬槸涓�娆TTP/2 GET璇锋眰锛孴S 29.510 搂5.3.2.2瀹氫箟浜嗘煡璇㈠弬鏁般�備竴涓湡瀹炵殑鍙戠幇璇锋眰URI褰㈠锛�

```
GET /nnrf-disc/v1/nf-instances?target-nf-type=SMF&requester-nf-type=AMF
    &snssais={"sst":1,"sd":0x010203}&dnn=internet
    &target-plmn-list=%5B%224600%22%5D&smf-set-id=set-1
```

NRF杩斿洖鐨勬槸涓�涓� `NFProfile` 鏁扮粍锛屽叾涓璖MF鐗规湁鐨勮兘鍔涘０鏄庡湪 `SmfInfo`锛圱S 29.510 搂6.1.6.2.85锛夈�傚叾IE缁撴瀯濡備笅锛�

```mermaid
classDiagram
    class NFProfile {
        +nfInstanceId : string
        +nfType : NFType=SMF
        +nfStatus : REGISTERED
        +fqdn : string
        +plmnList : PlmnId[]
        +nfSetId : string
        +capacity : integer
        +load : integer
    }
    class SmfInfo {
        +sNssaiSmfInfoList : SnssaiSmfInfo[]
        +taiList : TAI[]
        +pgwFqdn : string
        +accessType : AccessType[]
    }
    class SnssaiSmfInfo {
        +sNssai : SNssai
        +dnnList : string[]
    }
    NFProfile *-- SmfInfo : smfInfoList
    SmfInfo *-- SnssaiSmfInfo : sNssaiSmfInfoList
```

NRF鍖归厤閫昏緫锛圱S 29.510 搂5.3.3锛夛細鍏堢敤 `nfType=SMF` 涓� `plmnList` 杩囨护锛涘啀鐢ㄨ姹備腑鐨� `snssais` 鍘诲尮閰嶅悇 `SnssaiSmfInfo.sNssai`锛涜嫢璇锋眰甯� `dnn`锛岃繘涓�姝ヨ姹傝 `sNssai` 涓嬬殑 `dnnList` 鍖呭惈璇NN锛涜嫢甯� `nsi-id`锛屽垯鍖归厤瀹炰緥銆傛渶缁堣繑鍥炵殑鍒楄〃浜ょ敱AMF鍋氬姞鏉冨喅绛栥��**NRF鍙礋璐�"杩囨护"锛屼笉鍋�"閫夋嫨"**鈥斺�旈�夋嫨绠楁硶鍦ˋMF渚э紙杩欎竴鐐圭粡甯歌璇В锛夈��

## 涓冦�佹极娓稿満鏅細H-SMF涓嶸-SMF鐨勬媶鍒�

婕父鏃禨MF閫夋嫨瑕佸尯鍒�**鏈湴鍒嗘祦锛圠BO锛�**鍜�**褰掑睘鍦拌矾鐢憋紙Home-Routed, HR锛�**涓ょ鎷撴墤锛孴S 23.501 搂6.3.2.2瀵规鏈変笓闂ㄨ瀹氾細

| 缁村害 | 鏈湴鍒嗘祦 LBO | 褰掑睘鍦拌矾鐢� Home-Routed |
|------|--------------|------------------------|
| SMF浣嶇疆 | VPLMN锛堟嫓璁垮湴锛� | HPLMN锛堝綊灞炲湴锛� |
| 閫夋嫨鑰� | VPLMN-AMF缁廣-NRF鍙戠幇V-SMF | V-AMF缁廣-NRF鍙戠幇H-SMF锛堟垨缁廚SSF寮曞锛� |
| UPF | V-UPF | H-UPF锛堜腑闂碫-UPF鍋歂9闅ч亾锛� |
| 绛栫暐鎺у埗 | V-PCF锛堥儴鍒嗭級 | H-PCF涓绘帶 |
| 璁¤垂 | 鎷滆鍦颁负涓� | 褰掑睘鍦颁负涓伙紝鎷滆鍦扮敓鎴怌DT |
| 鍏稿瀷鍦烘櫙 | 婕父鏃跺氨杩戣闂湰鍦癐nternet | 杩愯惀鍟嗗唴閮ㄤ笓缃戙�佺粺涓�绠℃帶 |

鎶撳寘璇嗗埆瑕佺偣锛氭极娓告椂鐣欐剰NRF鍙戠幇璇锋眰閲� `target-plmn-list` 涓� `requester-plmn-list` 鐨勪笉鍚岋紱HR鍦烘櫙涓嬭兘鐪嬪埌 `Nsmf_PDUSession_Create` 鎸囧悜HPLMN FQDN鐨凷MF銆�

## 鍏�乁PF閫夋嫨鑱斿姩锛圱S 23.501 搂6.3.3锛�

SMF閫夊畾鍚庯紝绱ф帴鐫�SMF鑷繁浣滀负璇锋眰鑰咃紝瀵筓PF鍋氫竴娆＄粨鏋勭浉鍚岀殑NRF鍙戠幇銆俇PF鐨勮兘鍔涘０鏄庡湪 `UpfInfo.sNssaiUpfInfoList`锛堝惈 `sNssai`銆乣dnnList`銆乣pduSessionTypes`锛夈�俇PF閫夋嫨鐨勯澶栫害鏉熷寘鎷細

- **DNAI锛圖N Access Identifier锛�**锛氳竟缂樿绠楀満鏅紝PCF/AF閫氳繃绛栫暐涓嬪彂DNAI锛孲MF鎹閫夋嫨闈犺繎搴旂敤锛圠ocal DN锛夌殑UPF锛圱S 23.501 搂5.29锛夈��
- **SSC妯″紡**锛歋SC mode 1瑕佹眰浼氳瘽鐢熷懡鍛ㄦ湡鍐呴敋鐐筓PF涓嶅彉锛沵ode 3鍏佽閲嶉�夐敋鐐癸紙鍙傝宸叉媶瑙ｇ殑"SSC妯″紡3閿氱偣閲嶉��"锛夈��
- **鎷撴墤/瀹归噺**锛歂RF杩斿洖鐨刄PF璐熻浇鏉冮噸銆�

UPF閫夋嫨涓嶴MF閫夋嫨鏄袱涓嫭绔嬩絾鑰﹀悎鐨勫瓙闂锛�**SMF鍐冲畾"璋佺杩欐潯浼氳瘽"锛孶PF鍐冲畾"鏁版嵁浠庡摢涓敋鐐瑰嚭鍘�"**銆�

## 涔濄�丼MF Set涓庢帶鍒堕潰楂樺彲鐢�

Rel-16寮曞叆鐨� **SMF Set**锛圱S 23.501 搂5.25锛夊厑璁镐竴缁凷MF鍏变韩浼氳瘽涓婁笅鏂囷紙閫氳繃UDSF/鍏变韩瀛樺偍锛夈�傚湪SMF閫夋嫨鏃讹細

- AMF鍙湪NRF鏌ヨ涓甫 `smf-set-id`锛屾妸浼氳瘽瀹氬悜鍒版煇涓泦鍚堬紱
- 闆嗗悎鍐呬换涓�SMF鏁呴殰锛屽叾浣橲MF鑳戒粠鍏变韩瀛樺偍鎭㈠涓婁笅鏂囷紝瀹炵幇**鎺у埗闈㈡棤鐘舵�佸寲涓庢晠闅滆嚜鎰�**锛�
- 杩欎篃鏄疷RLLC绛夐珮鍙潬鍦烘櫙鐨勫叧閿敮鎾戙��

## 鍗併�丷el-17/18/19鐨勬紨杩涘寮�

- **鍗槦/NTN鎺ュ叆锛圧el-17+锛�**锛歋MF閫夋嫨闇�鑰冭檻鍗槦鍥炰紶鏃跺欢锛孉MF鍦ㄩ�夋嫨鏃朵紭鍏堜綆鏃跺欢鍦伴潰SMF锛汿S 23.501 搂5.4.10銆�
- **ATSSS锛圧el-16/17锛�**锛氬鎺ュ叆PDU浼氳瘽锛孲MF闇�鍚屾椂绠＄悊澶氫釜UPF閿氱偣锛岄�夋嫨鏃舵牎楠孶PF鐨勫鎺ュ叆鑳藉姏銆�
- **杈圭紭璁＄畻DNAI澧炲己锛圧el-18锛�**锛欰F閫氳繃NEF涓嬪彂DNAI+EAS閮ㄧ讲淇℃伅锛孲MF閫夋嫨UPF鏃惰繘琛岃竟缂橀噸瀹氫綅棰勫垽銆�
- **缃戠粶鍒囩墖宸紓鍖栵紙Rel-18/19锛�**锛歂SACF瀵规瘡涓猄-NSSAI鐨勬敞鍐屼細璇濇暟鍋氬噯鍏ユ帶鍒讹紝瓒呴檺鐨勪細璇濆湪SMF閫夋嫨鍓嶅嵆琚獳MF鎷掔粷鈥斺�旇繖涔熸槸涓轰粈涔�"閫夊緱鍒癝MF鍗村缓涓嶈捣浼氳瘽"鐨勫父瑙佸師鍥犮��

## 鍗佷竴銆佹姄鍖呰瘑鍒笌鎺掗敊

**濡備綍鐢╓ireshark/TShark璇嗗埆杩欐潯娴佺▼**锛圚TTP/2 over SBI锛夛細

```
# 鎵惧埌AMF鍙戣捣鐨凷MF鍙戠幇璇锋眰
http2.headers.method == "GET" && http2.headers.authority contains "nnrf-disc"
# 瀹氫綅CreateSMContext
http2.headers.method == "POST" && http.request.uri contains "sm-contexts"
# 鐢∟AS杩囨护鐪婾E璇锋眰鐨凞NN/S-NSSAI
nas_5gs.message_type == 0xc1   # PDU Session Establishment Request
```

**甯歌鏁呴殰涓庡畾浣嶆�濊矾**锛�

1. **NRF杩斿洖绌哄�欓�夊垪琛�**锛氭鏌RF鏄惁娉ㄥ唽浜嗘敮鎸佽 `S-NSSAI`+`DNN` 鐨凷MF锛坄SmfInfo.sNssaiSmfInfoList.dnnList` 鏄惁榻愬叏锛夛紱鍒囩墖鍦║DM璁㈤槄閲屾槸鍚� `defaultConfiguredSnssai`銆�
2. **AMF鏀跺埌 `Cause=DNN_NOT_SUPPORTED`锛�#27锛�**锛歎E璇锋眰鐨凞NN鏈湪璁㈤槄鐨凞NN鍒楄〃涓��
3. **NSI-ID涓嶅尮閰�**锛歂SSF寮曞鐨凬SI-ID涓嶯RF娉ㄥ唽鐨凷MF瀹炰緥NSI-ID涓嶄竴鑷达紝瀵艰嚧鍙戠幇澶辫触鈥斺�旀帓鏌SSF杩斿洖鍊间笌SMF娉ㄥ唽鍊笺��
4. **NSACF鍑嗗叆鎷掔粷**锛氬垏鐗囦細璇濇暟杈句笂闄愶紝AMF鍦–reateSMContext鍓嶅嵆鎷掔粷锛屽師鍥犲�间笌NSAC鏈夊叧锛岄渶鏌SACF璁℃暟銆�
5. **婕父LBO/HR娣锋穯**锛歎PF鍦ㄩ敊璇疨LMN锛屾鏌MF鏄惁璇皢V-SMF閫変负H-SMF锛岀湅 `target-plmn-list`銆�

## 鍗佷簩銆佸巶鍟嗗疄鐜板樊寮�

- **鍗庝负/涓叴/鐖辩珛淇�**锛歂RF杩囨护+AMF鍔犳潈閫夋嫨鏄爣鍑嗗疄鐜帮紝浣嗗姞鏉冨洜瀛愶紙瀹归噺鏉冮噸 vs 鎷撴墤鏉冮噸锛夌畻娉曠鏈夛紱
- **閮ㄥ垎鍘傚晢**锛氬湪AMF鏈湴缁存姢"鍒囩墖鈫扴MF姹�"缂撳瓨琛紝鍑忓皯NRF寰�杩旓紝浣嗙壓鐗蹭簡鍔ㄦ�佹�э紱
- **寮�婧恌ree5GC**锛欰MF鐩存帴閬嶅巻NRF鍏ㄩ噺NFProfile鍋氬唴瀛樺尮閰嶏紝閫傚悎鏁欏浣嗕笉閫傚悎澶ц妯″晢鐢紱
- **Cisco UCC AMF**锛氭彁渚涙樉寮忕殑"S-NSSAI based SMF Selection"閰嶇疆锛屾敮鎸佹寜S-NSSAI闈欐�佹寚瀹歋MF Set銆�

## 甯歌闂

**Q1: SMF閫夋嫨鍜孉MF閫夋嫨鏈変粈涔堟湰璐ㄥ尯鍒紵**
A: AMF閫夋嫨鍙戠敓鍦ㄦ敞鍐屾祦绋嬶紝鐢盪E鐨凬SSAI/5G-GUTI鍜孯AN寮曞锛屽喅瀹�"璋佺绉诲姩鎬�"锛汼MF閫夋嫨鍙戠敓鍦≒DU浼氳瘽寤虹珛锛岀敱DNN/S-NSSAI/NSI-ID鍐冲畾"璋佺杩欐潯浼氳瘽"銆傚墠鑰呭叧娉ㄥ垏鐗囨暣浣撳綊灞烇紝鍚庤�呭叧娉ㄦ暟鎹綉缁滀笌鍒囩墖瀹炰緥鐨勭粍鍚堛��

**Q2: 濡傛灉UE涓嶆彁渚汥NN锛屼細璇濊繕鑳藉缓绔嬪悧锛�**
A: 鍙互锛岃蛋榛樿SMF閫夋嫨鈥斺�擜MF浠嶶DM璁㈤槄涓彇璇-NSSAI瀵瑰簲鐨勯粯璁NN锛坄defaultDnnIndicator`锛夋浛浠ｃ�傝嫢璁㈤槄閲屾病鏈夐粯璁NN锛屽垯寤虹珛澶辫触銆�

**Q3: NRF杩斿洖澶氫釜SMF鏃讹紝鐢辫皝鍋氭渶缁堥�夋嫨锛�**
A: 鐢盇MF鍋氥�侼RF鍙礋璐ｆ寜IE杩囨护杩斿洖鍊欓�夊垪琛紝鍔犳潈閫夋嫨绠楁硶锛堝閲忋�佽礋杞姐�佹嫇鎵戙�佷細璇濅翰鍜岋級鍦ˋMF鏈湴瀹炵幇锛屾槸鍘傚晢绉佹湁閫昏緫銆�

**Q4: SMF Set涓�瀹氳兘淇濊瘉浼氳瘽涓嶄腑鏂悧锛�**
A: 闇�瑕佸墠鎻愶細闆嗗悎鍐匰MF鍏变韩浼氳瘽涓婁笅鏂囷紙閫氳繃UDSF锛夛紝涓擜MF鍦ㄩ噸閫夋椂浼樺厛閫夊悓闆嗗悎瀹炰緥銆傝嫢鍏变韩瀛樺偍鏈厤缃紝鍗昐MF鏁呴殰浠嶄細瀵艰嚧浼氳瘽涓㈠け銆�

**Q5: 鎶撳寘鏃禨MF鍙戠幇璇锋眰閲屾病鏈� `dnn` 鍙傛暟姝ｅ父鍚楋紵**
A: 姝ｅ父銆傚綋UE璧伴粯璁MF閫夋嫨銆佹垨AMF鍏堢敤S-NSSAI绮楃瓫鍐嶄簩娆＄‘璁NN鏃讹紝`dnn` 鍙兘涓虹┖锛汵RF姝ゆ椂杩斿洖璇ュ垏鐗囦笅鎵�鏈塖MF锛岀敱AMF渚у啀杩囨护銆�

## 鍙傝�冩潵婧�

1. [3GPP TS 23.501 鈥� System Architecture for the 5G System](https://www.3gpp.org/dynareport/23501.htm) 鈥� 搂6.3.2 Selection of SMF, 搂6.3.3 Selection of UPF, 搂5.15 Network slicing
2. [3GPP TS 29.510 鈥� Network function repository services; Stage 3](https://www.3gpp.org/dynareport/29510.htm) 鈥� 搂5.3 Nnrf_NFDiscovery, 搂6.1.6.2.85 SmfInfo
3. [3GPP TS 29.502 鈥� 5G System; Session Management Services; Stage 3](https://www.3gpp.org/dynareport/29502.htm) 鈥� 搂5.1 Nsmf_PDUSession, CreateSMContext
4. [3GPP TS 23.502 鈥� Procedures for the 5G System](https://www.3gpp.org/dynareport/23502.htm) 鈥� 搂4.3.2.2 UE-requested PDU Session Establishment
5. [Cisco 鈥� S-NSSAI based SMF Selection](https://www.cisco.com/c/en/us/td/docs/wireless/ucc/amf/2025-03/config-and-admin/ucc-5g-amf-configuration-and-administration-guide-release-2025-03/m_nsssai_smf_selection.pdf) 鈥� 鍘傚晢渚ф寜鍒囩墖闈欐�佹寚瀹歋MF Set鐨勫伐绋嬪疄鐜�
6. [free5GC 鈥� 5G Network Slicing](https://free5gc.org/blog/20241230/20241230/) 鈥� S-NSSAI/NSI-ID鍦ㄥ紑婧愭牳蹇冪綉涓殑浼犻�掍笌SMF鍖归厤
7. [3GPP TS 29.531 鈥� Network Slice Selection Services (Nssf)](https://www.etsi.org/deliver/etsi_ts/129500_129599/129531/) 鈥� Nnssf_NSSelection_Get杩斿洖NSI-ID涓庡�欓�塏RF

---
> 鏈枃鐢便��51瀛﹂�氫俊銆嶆妧鏈洟闃熷嚭鍝併��51瀛﹂�氫俊鐢遍�氫俊琛屼笟18骞磋�佸叺**鐖卞崼鐢�**锛堝井淇D: gprshome201101锛夌淮鎶わ紝鑱氱劍5G/6G鏍稿績缃戙��3GPP鏍囧噯瑙ｈ銆侀�氫俊鍓嶆部鎶�鏈繁搴﹀垎鏋愩��
> 鍑虹増浣滃搧鏈夈��5G鏍稿績缃戝師鐞嗕笌瀹炶返銆嬨�奍MS鍘熺悊涓庡疄璺点�嬬瓑4鏈�氫俊涓撲笟涔︾睄銆傜煡璇嗘槦鐞冦��51瀛﹂�氫俊銆嶆彁渚涙繁搴︽妧鏈瓟鐤戝拰琛屼笟娲炲療銆�
変簡鐙珛鐨勬秷鎭被鍨嬫爣璇嗭紙UE originating 涓� UE terminated鐨凞EREGISTRATION REQUEST锛夛紝鐩殑鏄UE/AMF閫氳繃娑堟伅绫诲瀷鐩存帴鍒ゅ埆鍛戒护鏉ユ簮锛岄伩鍏嶅湪鐘舵�佹満涓婁骇鐢熸涔夛紙渚嬪UE闇�瑕佺煡閬撹繖鏄綉缁滃懡浠よ�岄潪瀵硅嚜宸辫姹傜殑鍝嶅簲锛夛紝渚夸簬NAS灞傚仛涓ユ牸鐨勭姸鎬佸悎娉曟�ф牎楠岋紝涔熷埄浜庡畨鍏ㄤ笂涓嬫枃鍖哄垎銆�

**Q4: 闅愬紡鍘绘敞鍐屽拰鏄惧紡鍘绘敞鍐屾祦绋嬫湁浠�涔堟湰璐ㄥ尯鍒紵**
A: 鏄惧紡鍘绘敞鍐岋紙鏈枃鎷嗚В鐨勪袱鏉￠摼璺級閫氳繃N1 NAS淇′护鏄庣‘浜や簰锛孶E涓庣綉缁滃悓姝ョ姸鎬併�傞殣寮忓幓娉ㄥ唽鍒�**瀹屽叏涓嶆秹鍙奛1淇′护**锛屽彂鐢熷湪UE闀挎椂闂翠笉鍙揪锛圡obile Reachable Timer+Implicit Deregistration Timer瓒呮椂锛夋椂锛岀敱AMF鍗曟柟闈㈡墽琛屼笂涓嬫枃娓呯悊涓嶶DM鍘绘敞鍐岄�氱煡銆傚墠鑰呮槸"鍗忚鎻℃墜"锛屽悗鑰呮槸"瓒呮椂鍏滃簳"锛屼袱鑰呯殑UDM渚ф渶缁堢姸鎬佷竴鑷翠絾瑙﹀彂涓庤矾寰勮骏寮傘��

**Q5: 鍘绘敞鍐屾祦绋嬩腑AMF鏄苟琛岃繕鏄覆琛岄噴鏀惧涓狿DU浼氳瘽锛�**
A: TS 23.502鍏佽AMF瀵瑰涓狿DU浼氳瘽鐨凬smf_PDUSession_ReleaseSMContext**骞惰鍙戣捣**锛堝鏃跺簭鍥句腑鐨刾ar鍧楋級锛屼笉鍚孲MF闂存棤渚濊禆鍏崇郴銆備絾鍗曟潯浼氳瘽鍐呴儴锛圫MF鈫扷PF鈫扨CF锛変粛闇�鎸夊簭瀹屾垚銆傚疄闄呮槸鍚﹀苟琛屽彇鍐充簬AMF瀹炵幇锛屽苟琛屽彲鏄捐憲缂╃煭澶氫細璇漊E锛堝鍚屾椂鎵胯浇eMBB+IMS锛夌殑鍘绘敞鍐屾�绘椂寤躲��

## 鍙傝�冩潵婧�

1. [3GPP TS 23.502 鈥� Procedures for the 5G System (5GS), Section 4.2.2 Deregistration](https://www.3gpp.org/dynareport/23502.htm) 鈥� 鍘绘敞鍐屾祦绋婼tage 2鏉冨▉瀹氫箟锛圲E鍙戣捣4.2.2.2銆佺綉缁滃彂璧�4.2.2.3锛�
2. [3GPP TS 24.501 鈥� Non-Access-Stratum (NAS) protocol for 5GS](https://www.3gpp.org/dynareport/24501.htm) 鈥� DEREGISTRATION REQUEST/ACCEPT娑堟伅涓嶥eregistration type IE鐨凷tage 3缂栬В鐮�
3. [3GPP TS 23.501 鈥� System architecture for the 5G System](https://www.3gpp.org/dynareport/23501.htm) 鈥� 5GMM娉ㄥ唽绠＄悊鐘舵�佹満涓庢帴鍏�/绉诲姩鎬х鐞嗘灦鏋勫師鍒�
4. [3glteinfo 鈥� 5G Deregistration Procedure Call Flow](https://www.3glteinfo.com/call-flows/5g-deregistration-procedure/) 鈥� UE鍙戣捣鍘绘敞鍐屽懠鍙祦绋嬪浘涓嶪E娉ㄩ噴
5. [3glteinfo 鈥� 5G Network-Initiated Deregistration Procedure Call Flow](https://www.3glteinfo.com/call-flows/5g-network-initiated-deregistration/) 鈥� 缃戠粶鍙戣捣鍘绘敞鍐屾祦绋嬩笌瀵诲懠澶勭悊缁嗚妭
6. [TelecomTrainer 鈥� 5G Core Deregistration and SM Context Release Explained](https://www.telecomtrainer.com/5g-core-deregistration-and-sm-context-release-explained-udm-and-smf-interactions/) 鈥� UDM/SMF浜や簰涓嶴M涓婁笅鏂囬噴鏀剧殑瀹炴垬瑙ｈ

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