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free5GC 5GCとUERANSIM UE/RANによるシミュレーション携帯網

Last updated at 2022-09-05Posted at 2022-03-12

UERANSIM(5G UEとRAN(gNodeB)シミュレータ)は、2020年11月17日版からPDUセッションタイプにIPv4をサポートし、Data Plane機能に対応しました。そこで、U-PlaneのDN(Data Network)を試すため、5GC携帯網のシミュレーション環境を構築しました。登場する携帯網の構成要素は全てOSS(オープンソース)であり、紹介するシミュレーションの構成例はシンプルです。ここでは、その全体像と設定ファイルについて簡単に説明します。
なお、5GCのコア網に登場する各NF(Network Function)の役割やインターフェースについて概ね知っていることを期待して書いており、これらの説明は省略します。

free5GC 5GCのシミュレーション携帯網の概要
free5GC 5GCとUERANSIM UE/RANの設定ファイルの変更点
free5GC 5GCとUERANSIM UE/RANのネットワーク設定
- free5GC 5GC U-Plane1のネットワーク設定
- free5GC 5GC U-Plane2のネットワーク設定
free5GCとUERANSIMのビルド
free5GC 5GCとUERANSIM UE/RANを実行
google.comにpingする
- DN=10.61.0.0/16を経由する場合
最後に
主な変更履歴

free5GC 5GCのシミュレーション携帯網の概要

今回、DNN毎に異なるDNの端点で任意のパケットを流すことを目的に、5GC携帯網をシミュレーション用に構築しました。DNを通してインターネットと通信可能です。
このシミュレーション環境は以下の条件を満たす最小構成になります。

C-Planeは複数のU-Planeと連携する。
U-Planeは複数のDNを管理する。
複数のUEは同じDNに接続する。

構築したシミュレーション環境は以下の通りです。

5GCとUE/RANに使用しているOSSは以下の通りです。

5GC - free5GC v3.2.1 - https://github.com/free5gc/free5gc
UE/RAN - UERANSIM v3.2.6 - https://github.com/aligungr/UERANSIM

各VMは以下の通りです。

VM#	SW & Role	IP address	OS	Memory (Min)	HDD (Min)
VM1	free5GC 5GC C-Plane	192.168.0.141/24	Ubuntu 20.04	2GB	20GB
VM2	free5GC 5GC U-Plane1	192.168.0.142/24	Ubuntu 20.04	1GB	20GB
VM3	free5GC 5GC U-Plane2	192.168.0.143/24	Ubuntu 20.04	1GB	20GB
VM4	UERANSIM RAN (gNodeB)	192.168.0.131/24	Ubuntu 20.04	1GB	10GB
VM5	UERANSIM UE	192.168.0.132/24	Ubuntu 20.04	1GB	10GB

加入者情報は以下の通りです。(その他の項目はデフォルト値)
注意。UERANSIMのUEの設定に合わせて、OPあるいはOPcを選択してください。

UE#	IMSI	DNN	OP/OPc
UE0	001010000000000	internet	OPc
UE1	001010000000001	internet2	OPc
UE2	001010000000002	internet2	OPc
UE3	001010000000003	ims	OPc
UE4	001010000000004	ims	OPc

これらの情報の登録には、free5GCが提供するWebUIを使用しました。なお、3GPP認証とキー生成機能(MILENAGE)の試験データとして、3GPP TS 35.208 "4.3 Test Sets"が公開されています。

各DNは以下の通りです。

DN	TUNnel interface of DN	DNN	TUNnel interface of UE	U-Plane#
10.60.0.0/16	upfgtp	internet	uesimtun0	U-Plane1
10.61.0.0/16	upfgtp	internet2	uesimtun1, uesimtun2	U-Plane1
10.62.0.0/16	upfgtp	ims	uesimtun3, uesimtun4	U-Plane2

追加情報。free5GC 5GC U-PlaneはRaspberry Pi 4 Model Bで動作しました。OSにはUbuntu 20.04 (64bit) for Raspberry Pi 4を使用しています。これにより、コンパクトなU-Planeをエッジに配置し、DNの端点として簡易に使用することができます。なお、この場合のDNの通信性能については確認していません。

free5GC 5GCとUERANSIM UE/RANの設定ファイルの変更点

free5GCとUERANSIMのビルド方法は以下を参照して下さい。

free5GC v3.2.1 - https://github.com/free5gc/free5gc/wiki/Installation
UERANSIM v3.2.6 - https://github.com/aligungr/UERANSIM/wiki/Installation

free5GC 5GC C-Planeの設定ファイルの変更点

free5GCでは、PFCPの接続先としてUPFを選択するロジックに使用可能なパラメータは以下の通りです。PFCP(Packet Forwarding Control Protocol)とは、5GCでCU分離のために導入されたプロトコルです。

DNN
S-NSSAI

話を簡単にするために、今回はDNNのみ使用しています。ここに登場する全てのUEのS-NSSAIは、SST=1とSD=010203に固定しています。

free5gc/config/amfcfg.yaml

--- amfcfg.yaml.orig    2022-04-01 20:25:53.176313323 +0900
+++ amfcfg.yaml 2022-04-01 20:40:46.893025409 +0900
@@ -5,7 +5,7 @@
 configuration:
   amfName: AMF # the name of this AMF
   ngapIpList:  # the IP list of N2 interfaces on this AMF
-    - 127.0.0.18
+    - 192.168.0.141
   sbi: # Service-based interface information
     scheme: http # the protocol for sbi (http or https)
     registerIPv4: 127.0.0.18 # IP used to register to NRF
@@ -23,18 +23,18 @@
   servedGuamiList: # Guami (Globally Unique AMF ID) list supported by this AMF
     # <GUAMI> = <MCC><MNC><AMF ID>
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       amfId: cafe00 # AMF identifier (3 bytes hex string, range: 000000~FFFFFF)
   supportTaiList:  # the TAI (Tracking Area Identifier) list supported by this AMF
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       tac: 1 # Tracking Area Code (uinteger, range: 0~16777215)
   plmnSupportList: # the PLMNs (Public land mobile network) list supported by this AMF
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       snssaiList: # the S-NSSAI (Single Network Slice Selection Assistance Information) list supported by this AMF
         - sst: 1 # Slice/Service Type (uinteger, range: 0~255)
           sd: 010203 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
@@ -42,6 +42,8 @@
           sd: 112233 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
   supportDnnList:  # the DNN (Data Network Name) list supported by this AMF
     - internet
+    - internet2
+    - ims
   nrfUri: http://127.0.0.10:8000 # a valid URI of NRF
   security:  # NAS security parameters
     integrityOrder: # the priority of integrity algorithms

free5gc/config/ausfcfg.yaml

--- ausfcfg.yaml.orig   2022-04-01 20:25:53.176313323 +0900
+++ ausfcfg.yaml        2022-04-03 20:14:00.534684505 +0900
@@ -15,8 +15,8 @@
     - nausf-auth # Nausf_UEAuthentication service
   nrfUri: http://127.0.0.10:8000 # a valid URI of NRF
   plmnSupportList: # the PLMNs (Public Land Mobile Network) list supported by this AUSF
-    - mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-      mnc: 93  # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    - mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+      mnc: 01  # Mobile Network Code (2 or 3 digits string, digit: 0~9)
     - mcc: 123 # Mobile Country Code (3 digits string, digit: 0~9)
       mnc: 45  # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   groupId: ausfGroup001 # ID for the group of the AUSF

free5gc/config/nrfcfg.yaml

--- nrfcfg.yaml.orig    2022-04-01 20:25:53.177313344 +0900
+++ nrfcfg.yaml 2022-04-01 20:42:46.692661495 +0900
@@ -14,8 +14,8 @@
       pem: config/TLS/nrf.pem # NRF TLS Certificate
       key: config/TLS/nrf.key # NRF TLS Private key
   DefaultPlmnId:
-    mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-    mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+    mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   serviceNameList: # the SBI services provided by this NRF, refer to TS 29.510
     - nnrf-nfm # Nnrf_NFManagement service
     - nnrf-disc # Nnrf_NFDiscovery service

free5gc/config/nssfcfg.yaml

--- nssfcfg.yaml.orig   2022-04-01 20:25:53.177313344 +0900
+++ nssfcfg.yaml        2022-04-01 20:44:09.603628178 +0900
@@ -17,12 +17,12 @@
     - nnssf-nssaiavailability # Nnssf_NSSAIAvailability service
   nrfUri: http://127.0.0.10:8000 # a valid URI of NRF
   supportedPlmnList: # the PLMNs (Public land mobile network) list supported by this NSSF
-    - mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-      mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    - mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+      mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   supportedNssaiInPlmnList: # Supported S-NSSAI List for each PLMN
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       supportedSnssaiList: # Supported S-NSSAIs of the PLMN
         - sst: 1 # Slice/Service Type (uinteger, range: 0~255)
           sd: 010203 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)

free5gc/config/smfcfg.yaml

--- smfcfg.yaml.orig    2022-04-01 20:25:53.177313344 +0900
+++ smfcfg.yaml 2022-04-01 20:54:07.296844993 +0900
@@ -24,26 +24,25 @@
         - dnn: internet # Data Network Name
           dns: # the IP address of DNS
             ipv4: 8.8.8.8
-    - sNssai: # S-NSSAI (Single Network Slice Selection Assistance Information)
-        sst: 1 # Slice/Service Type (uinteger, range: 0~255)
-        sd: 112233 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
-      dnnInfos: # DNN information list
-        - dnn: internet # Data Network Name
+        - dnn: internet2 # Data Network Name
           dns: # the IP address of DNS
             ipv4: 8.8.8.8
+        - dnn: ims
+          dns:
+            ipv4: 8.8.8.8
   plmnList: # the list of PLMN IDs that this SMF belongs to (optional, remove this key when unnecessary)
-    - mcc: "208" # Mobile Country Code (3 digits string, digit: 0~9)
-      mnc: "93" # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    - mcc: "001" # Mobile Country Code (3 digits string, digit: 0~9)
+      mnc: "01" # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   locality: area1 # Name of the location where a set of AMF, SMF and UPFs are located
   pfcp: # the IP address of N4 interface on this SMF (PFCP)
-    addr: 127.0.0.1
+    addr: 192.168.0.141
   userplaneInformation: # list of userplane information
     upNodes: # information of userplane node (AN or UPF)
       gNB1: # the name of the node
         type: AN # the type of the node (AN or UPF)
-      UPF:  # the name of the node
+      UPF1:  # the name of the node
         type: UPF # the type of the node (AN or UPF)
-        nodeID: 127.0.0.8 # the IP/FQDN of N4 interface on this UPF (PFCP)
+        nodeID: 192.168.0.142 # the IP/FQDN of N4 interface on this UPF (PFCP)
         sNssaiUpfInfos: # S-NSSAI information list for this UPF
           - sNssai: # S-NSSAI (Single Network Slice Selection Assistance Information)
               sst: 1 # Slice/Service Type (uinteger, range: 0~255)
@@ -52,22 +51,41 @@
               - dnn: internet
                 pools:
                   - cidr: 10.60.0.0/16
-          - sNssai: # S-NSSAI (Single Network Slice Selection Assistance Information)
-              sst: 1 # Slice/Service Type (uinteger, range: 0~255)
-              sd: 112233 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
-            dnnUpfInfoList: # DNN information list for this S-NSSAI
-              - dnn: internet
+              - dnn: internet2
                 pools:
                   - cidr: 10.61.0.0/16
         interfaces: # Interface list for this UPF
           - interfaceType: N3 # the type of the interface (N3 or N9)
             endpoints: # the IP address of this N3/N9 interface on this UPF
-              - 127.0.0.8
+              - 192.168.0.142
             networkInstance: internet # Data Network Name (DNN)
+          - interfaceType: N3
+            endpoints:
+              - 192.168.0.142
+            networkInstance: internet2
+      UPF2:
+        type: UPF
+        nodeID: 192.168.0.143
+        sNssaiUpfInfos:
+          - sNssai:
+              sst: 1
+              sd: 010203
+            dnnUpfInfoList:
+              - dnn: ims
+                pools:
+                  - cidr: 10.62.0.0/16
+        interfaces:
+          - interfaceType: N3
+            endpoints:
+              - 192.168.0.143
+            networkInstance: ims
     links: # the topology graph of userplane, A and B represent the two nodes of each link
       - A: gNB1
-        B: UPF
+        B: UPF1
+      - A: gNB1
+        B: UPF2
   nrfUri: http://127.0.0.10:8000 # a valid URI of NRF
+  ulcl: false
 
 # the kind of log output
 # debugLevel: how detailed to output, value: trace, debug, info, warn, error, fatal, panic

free5GC 5GC U-Plane1の設定ファイルの変更点

free5gc/config/upfcfg.yaml

--- upfcfg.yaml.orig    2022-08-11 14:42:32.545805826 +0900
+++ upfcfg.yaml 2022-08-11 14:53:00.703425741 +0900
@@ -3,8 +3,8 @@
 
 # The listen IP and nodeID of the N4 interface on this UPF (Can't set to 0.0.0.0)
 pfcp:
-  addr: 127.0.0.8   # IP addr for listening
-  nodeID: 127.0.0.8 # External IP or FQDN can be reached
+  addr: 192.168.0.142   # IP addr for listening
+  nodeID: 192.168.0.142 # External IP or FQDN can be reached
   retransTimeout: 1s # retransmission timeout
   maxRetrans: 3 # the max number of retransmission
 
@@ -13,7 +13,7 @@
   # The IP list of the N3/N9 interfaces on this UPF
   # If there are multiple connection, set addr to 0.0.0.0 or list all the addresses
   ifList:
-    - addr: 127.0.0.8
+    - addr: 192.168.0.142
       type: N3
       # name: upf.5gc.nctu.me
       # ifname: gtpif
@@ -21,8 +21,10 @@
 # The DNN list supported by UPF
 dnnList:
   - dnn: internet # Data Network Name
-    cidr: 10.60.0.0/24 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
+    cidr: 10.60.0.0/16 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
     # natifname: eth0
+  - dnn: internet2
+    cidr: 10.61.0.0/16
 
 logger: # log output setting
   enable: true # true or false

free5GC 5GC U-Plane2の設定ファイルの変更点

free5gc/config/upfcfg.yaml

--- upfcfg.yaml.orig    2022-08-11 14:44:10.418739050 +0900
+++ upfcfg.yaml 2022-08-11 14:57:26.340226675 +0900
@@ -3,8 +3,8 @@
 
 # The listen IP and nodeID of the N4 interface on this UPF (Can't set to 0.0.0.0)
 pfcp:
-  addr: 127.0.0.8   # IP addr for listening
-  nodeID: 127.0.0.8 # External IP or FQDN can be reached
+  addr: 192.168.0.143   # IP addr for listening
+  nodeID: 192.168.0.143 # External IP or FQDN can be reached
   retransTimeout: 1s # retransmission timeout
   maxRetrans: 3 # the max number of retransmission
 
@@ -13,15 +13,15 @@
   # The IP list of the N3/N9 interfaces on this UPF
   # If there are multiple connection, set addr to 0.0.0.0 or list all the addresses
   ifList:
-    - addr: 127.0.0.8
+    - addr: 192.168.0.143
       type: N3
       # name: upf.5gc.nctu.me
       # ifname: gtpif
 
 # The DNN list supported by UPF
 dnnList:
-  - dnn: internet # Data Network Name
-    cidr: 10.60.0.0/24 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
+  - dnn: ims # Data Network Name
+    cidr: 10.62.0.0/16 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
     # natifname: eth0
 
 logger: # log output setting

UERANSIM UE/RANの設定ファイルの変更点

RANの設定ファイルの変更点

UERANSIM/config/free5gc-gnb.yaml

--- free5gc-gnb.yaml.orig       2021-02-11 11:03:28.000000000 +0900
+++ free5gc-gnb.yaml    2022-04-01 21:43:08.519802520 +0900
@@ -1,17 +1,17 @@
-mcc: '208'          # Mobile Country Code value
-mnc: '93'           # Mobile Network Code value (2 or 3 digits)
+mcc: '001'          # Mobile Country Code value
+mnc: '01'           # Mobile Network Code value (2 or 3 digits)
 
 nci: '0x000000010'  # NR Cell Identity (36-bit)
 idLength: 32        # NR gNB ID length in bits [22...32]
 tac: 1              # Tracking Area Code
 
-linkIp: 127.0.0.1   # gNB's local IP address for Radio Link Simulation (Usually same with local IP)
-ngapIp: 127.0.0.1   # gNB's local IP address for N2 Interface (Usually same with local IP)
-gtpIp: 127.0.0.1    # gNB's local IP address for N3 Interface (Usually same with local IP)
+linkIp: 192.168.0.131   # gNB's local IP address for Radio Link Simulation (Usually same with local IP)
+ngapIp: 192.168.0.131   # gNB's local IP address for N2 Interface (Usually same with local IP)
+gtpIp: 192.168.0.131    # gNB's local IP address for N3 Interface (Usually same with local IP)
 
 # List of AMF address information
 amfConfigs:
-  - address: 127.0.0.1
+  - address: 192.168.0.141
     port: 38412
 
 # List of supported S-NSSAIs by this gNB

UE0(IMSI-001010000000000)の設定ファイルの変更点

最初に、free5gc-ue.yamlからfree5gc-ue0.yamlにコピーを作成します。

# cd UERANSIM/config
# cp free5gc-ue.yaml free5gc-ue0.yaml

次に、free5gc-ue0.yamlを編集します。

UERANSIM/config/free5gc-ue0.yaml

--- free5gc-ue.yaml.orig        2021-09-18 21:11:52.000000000 +0900
+++ free5gc-ue0.yaml    2022-04-01 22:10:37.686699257 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-208930000000003'
+supi: 'imsi-001010000000000'
 # Mobile Country Code value of HPLMN
-mcc: '208'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '93'
+mnc: '01'
 
 # Permanent subscription key
 key: '8baf473f2f8fd09487cccbd7097c6862'
@@ -20,7 +20,7 @@
 
 # List of gNB IP addresses for Radio Link Simulation
 gnbSearchList:
-  - 127.0.0.1
+  - 192.168.0.131
 
 # UAC Access Identities Configuration
 uacAic:

UE1(IMSI-001010000000001)の設定ファイルの変更点

最初に、free5gc-ue.yamlからfree5gc-ue1.yamlにコピーを作成します。

# cd UERANSIM/config
# cp free5gc-ue.yaml free5gc-ue1.yaml

次に、free5gc-ue1.yamlを編集します。

UERANSIM/config/free5gc-ue1.yaml

--- free5gc-ue.yaml.orig        2021-09-18 21:11:52.000000000 +0900
+++ free5gc-ue1.yaml    2022-04-01 21:47:05.064780302 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-208930000000003'
+supi: 'imsi-001010000000001'
 # Mobile Country Code value of HPLMN
-mcc: '208'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '93'
+mnc: '01'
 
 # Permanent subscription key
 key: '8baf473f2f8fd09487cccbd7097c6862'
@@ -20,7 +20,7 @@
 
 # List of gNB IP addresses for Radio Link Simulation
 gnbSearchList:
-  - 127.0.0.1
+  - 192.168.0.131
 
 # UAC Access Identities Configuration
 uacAic:
@@ -39,7 +39,7 @@
 # Initial PDU sessions to be established
 sessions:
   - type: 'IPv4'
-    apn: 'internet'
+    apn: 'internet2'
     slice:
       sst: 0x01
       sd: 0x010203

UE2(IMSI-001010000000002)の設定ファイルの変更点

最初に、free5gc-ue.yamlからfree5gc-ue2.yamlにコピーを作成します。

# cd UERANSIM/config
# cp free5gc-ue.yaml free5gc-ue2.yaml

次に、free5gc-ue2.yamlを編集します。

UERANSIM/config/free5gc-ue2.yaml

--- free5gc-ue.yaml.orig        2021-09-18 21:11:52.000000000 +0900
+++ free5gc-ue2.yaml    2022-04-01 21:47:46.128978779 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-208930000000003'
+supi: 'imsi-001010000000002'
 # Mobile Country Code value of HPLMN
-mcc: '208'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '93'
+mnc: '01'
 
 # Permanent subscription key
 key: '8baf473f2f8fd09487cccbd7097c6862'
@@ -20,7 +20,7 @@
 
 # List of gNB IP addresses for Radio Link Simulation
 gnbSearchList:
-  - 127.0.0.1
+  - 192.168.0.131
 
 # UAC Access Identities Configuration
 uacAic:
@@ -39,7 +39,7 @@
 # Initial PDU sessions to be established
 sessions:
   - type: 'IPv4'
-    apn: 'internet'
+    apn: 'internet2'
     slice:
       sst: 0x01
       sd: 0x010203

UE3(IMSI-001010000000003)の設定ファイルの変更点

最初に、free5gc-ue.yamlからfree5gc-ue3.yamlにコピーを作成します。

# cd UERANSIM/config
# cp free5gc-ue.yaml free5gc-ue3.yaml

次に、free5gc-ue3.yamlを編集します。

UERANSIM/config/free5gc-ue3.yaml

--- free5gc-ue.yaml.orig        2021-09-18 21:11:52.000000000 +0900
+++ free5gc-ue3.yaml    2022-04-01 21:48:36.274214416 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-208930000000003'
+supi: 'imsi-001010000000003'
 # Mobile Country Code value of HPLMN
-mcc: '208'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '93'
+mnc: '01'
 
 # Permanent subscription key
 key: '8baf473f2f8fd09487cccbd7097c6862'
@@ -20,7 +20,7 @@
 
 # List of gNB IP addresses for Radio Link Simulation
 gnbSearchList:
-  - 127.0.0.1
+  - 192.168.0.131
 
 # UAC Access Identities Configuration
 uacAic:
@@ -39,7 +39,7 @@
 # Initial PDU sessions to be established
 sessions:
   - type: 'IPv4'
-    apn: 'internet'
+    apn: 'ims'
     slice:
       sst: 0x01
       sd: 0x010203

UE4(IMSI-001010000000004)の設定ファイルの変更点

最初に、free5gc-ue.yamlからfree5gc-ue4.yamlにコピーを作成します。

# cd UERANSIM/config
# cp free5gc-ue.yaml free5gc-ue4.yaml

次に、free5gc-ue4.yamlを編集します。

UERANSIM/config/free5gc-ue4.yaml

--- free5gc-ue.yaml.orig        2021-09-18 21:11:52.000000000 +0900
+++ free5gc-ue4.yaml    2022-04-01 21:49:14.312388653 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-208930000000003'
+supi: 'imsi-001010000000004'
 # Mobile Country Code value of HPLMN
-mcc: '208'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '93'
+mnc: '01'
 
 # Permanent subscription key
 key: '8baf473f2f8fd09487cccbd7097c6862'
@@ -20,7 +20,7 @@
 
 # List of gNB IP addresses for Radio Link Simulation
 gnbSearchList:
-  - 127.0.0.1
+  - 192.168.0.131
 
 # UAC Access Identities Configuration
 uacAic:
@@ -39,7 +39,7 @@
 # Initial PDU sessions to be established
 sessions:
   - type: 'IPv4'
-    apn: 'internet'
+    apn: 'ims'
     slice:
       sst: 0x01
       sd: 0x010203

free5GC 5GCとUERANSIM UE/RANのネットワーク設定

free5GC 5GC U-Plane1のネットワーク設定

最初に、/etc/sysctl.confファイルの以下の行のコメントを外し、OSに反映します。

net.ipv4.ip_forward=1

# sysctl -p

次に、NAPTを設定します。

# iptables -t nat -A POSTROUTING -s 10.60.0.0/16 ! -o upfgtp -j MASQUERADE
# iptables -t nat -A POSTROUTING -s 10.61.0.0/16 ! -o upfgtp -j MASQUERADE

free5GC 5GC U-Plane2のネットワーク設定

最初に、/etc/sysctl.confファイルの以下の行のコメントを外し、OSに反映します。

net.ipv4.ip_forward=1

# sysctl -p

次に、NAPTを設定します。

# iptables -t nat -A POSTROUTING -s 10.62.0.0/16 ! -o upfgtp -j MASQUERADE

free5GCとUERANSIMのビルド

free5GCとUERANSIMのビルド方法は以下を参照して下さい。

free5GC v3.2.1 - https://github.com/free5gc/free5gc/wiki/Installation
UERANSIM v3.2.6 - https://github.com/aligungr/UERANSIM/wiki/Installation

注意。free5GC 5GC C-PlaneマシンにMongoDBをインストールして下さい。なお、MongoDBのデータベースを簡単に確認するには、MongoDB Compassが便利です。

# apt update
# apt install mongodb
# systemctl start mongodb
# systemctl enable mongodb

なお、free5GC 5GC U-PlaneマシンにはMongoDBをインストールする必要はありません。
注意。最新のコミットされたバージョンを使用する場合は、ビルドする前に以下のスクリプトを実行して、全てのNFとWebコンソールを最新のmainブランチにcheckoutして下さい。

#!/usr/bin/env bash

NF_LIST="nrf amf smf udr pcf udm nssf ausf upf n3iwf"

for NF in ${NF_LIST}; do
    cd NFs/${NF}
    git checkout main
    cd ../..
done

cd webconsole
git checkout main

cd ..
git checkout main

free5GC 5GCとUERANSIM UE/RANを実行

最初に5GCを起動し、次にUERANSIM(UEとRANのシミュレータ)を起動します。

free5GC 5GC U-Plane1とU-Plane2を実行

最初に、free5GC 5GC U-Planeを実行して下さい。理由はこちらです。

free5GC 5GC U-Plane1

# cd free5gc/NFs/upf/build
# bin/free5gc-upfd

free5GC 5GC U-Plane2

# cd free5gc/NFs/upf/build
# bin/free5gc-upfd

free5GC 5GC C-Planeを実行

次に、free5GC 5GC C-Planeを起動します。

free5GC 5GC C-Plane

次のスクリプトを作成して、実行します。

#!/usr/bin/env bash

PID_LIST=()

NF_LIST="nrf amf smf udr pcf udm nssf ausf"

export GIN_MODE=release

for NF in ${NF_LIST}; do
    ./bin/${NF} &
    PID_LIST+=($!)
    sleep 1
done

function terminate()
{
    sudo kill -SIGTERM ${PID_LIST[${#PID_LIST[@]}-2]} ${PID_LIST[${#PID_LIST[@]}-1]}
    sleep 2
}

trap terminate SIGINT
wait ${PID_LIST}

UERANSIMを実行

ここでは、UE1(DNN=internet2に設定したIMSI-001010000000001)とRANを実行する場合を説明します。まず、gNodeBと5GCの間でNG-Setupし、5GCにUEを登録し、PDUセッションを確立します。

UERANSIMの使い方は以下を参照して下さい。

https://github.com/aligungr/UERANSIM/wiki/Usage

gNBを起動

次のようにgNBを起動します。

# ./nr-gnb -c ../config/free5gc-gnb.yaml
UERANSIM v3.2.6
[2022-08-11 15:31:29.042] [sctp] [info] Trying to establish SCTP connection... (192.168.0.141:38412)
[2022-08-11 15:31:29.044] [sctp] [info] SCTP connection established (192.168.0.141:38412)
[2022-08-11 15:31:29.045] [sctp] [debug] SCTP association setup ascId[4]
[2022-08-11 15:31:29.045] [ngap] [debug] Sending NG Setup Request
[2022-08-11 15:31:29.047] [ngap] [debug] NG Setup Response received
[2022-08-11 15:31:29.047] [ngap] [info] NG Setup procedure is successful

free5GC C-Planeのログは以下の通りです。

2022-08-11T15:31:29+09:00 [INFO][AMF][NGAP] [AMF] SCTP Accept from: 192.168.0.131:58560
2022-08-11T15:31:29+09:00 [INFO][AMF][NGAP] Create a new NG connection for: 192.168.0.131:58560
2022-08-11T15:31:29+09:00 [INFO][AMF][NGAP][192.168.0.131:58560] Handle NG Setup request
2022-08-11T15:31:29+09:00 [INFO][AMF][NGAP][192.168.0.131:58560] Send NG-Setup response

UE(UE1)を起動

次のようにUE(UE1)を起動します。これにより、5GCにUE(UE1)が登録され、PDUセッションが確立します。

# ./nr-ue -c ../config/free5gc-ue1.yaml 
UERANSIM v3.2.6
[2022-08-11 15:32:13.852] [nas] [info] UE switches to state [MM-DEREGISTERED/PLMN-SEARCH]
[2022-08-11 15:32:13.853] [rrc] [debug] New signal detected for cell[1], total [1] cells in coverage
[2022-08-11 15:32:13.853] [nas] [info] Selected plmn[001/01]
[2022-08-11 15:32:13.854] [rrc] [info] Selected cell plmn[001/01] tac[1] category[SUITABLE]
[2022-08-11 15:32:13.854] [nas] [info] UE switches to state [MM-DEREGISTERED/PS]
[2022-08-11 15:32:13.855] [nas] [info] UE switches to state [MM-DEREGISTERED/NORMAL-SERVICE]
[2022-08-11 15:32:13.855] [nas] [debug] Initial registration required due to [MM-DEREG-NORMAL-SERVICE]
[2022-08-11 15:32:13.856] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-08-11 15:32:13.856] [nas] [debug] Sending Initial Registration
[2022-08-11 15:32:13.856] [rrc] [debug] Sending RRC Setup Request
[2022-08-11 15:32:13.857] [nas] [info] UE switches to state [MM-REGISTER-INITIATED]
[2022-08-11 15:32:13.858] [rrc] [info] RRC connection established
[2022-08-11 15:32:13.858] [rrc] [info] UE switches to state [RRC-CONNECTED]
[2022-08-11 15:32:13.858] [nas] [info] UE switches to state [CM-CONNECTED]
[2022-08-11 15:32:13.889] [nas] [debug] Authentication Request received
[2022-08-11 15:32:13.897] [nas] [debug] Security Mode Command received
[2022-08-11 15:32:13.897] [nas] [debug] Selected integrity[2] ciphering[0]
[2022-08-11 15:32:13.941] [nas] [debug] Registration accept received
[2022-08-11 15:32:13.941] [nas] [info] UE switches to state [MM-REGISTERED/NORMAL-SERVICE]
[2022-08-11 15:32:13.941] [nas] [debug] Sending Registration Complete
[2022-08-11 15:32:13.941] [nas] [info] Initial Registration is successful
[2022-08-11 15:32:13.942] [nas] [debug] Sending PDU Session Establishment Request
[2022-08-11 15:32:13.942] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-08-11 15:32:14.197] [nas] [debug] PDU Session Establishment Accept received
[2022-08-11 15:32:14.202] [nas] [info] PDU Session establishment is successful PSI[1]
[2022-08-11 15:32:14.224] [app] [info] Connection setup for PDU session[1] is successful, TUN interface[uesimtun0, 10.61.0.1] is up.

free5GC C-Planeのログは以下の通りです。

2022-08-11T15:32:13+09:00 [INFO][AMF][NGAP][192.168.0.131:58560] Handle Initial UE Message
2022-08-11T15:32:13+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [Deregistered] to [Deregistered]
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Handle Registration Request
2022-08-11T15:32:13+09:00 [INFO][LIB][FSM] Handle event[Start Authentication], transition from [Deregistered] to [Authentication]
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Authentication procedure
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&target-nf-type=AUSF |
2022-08-11T15:32:13+09:00 [INFO][AUSF][UeAuthPost] HandleUeAuthPostRequest
2022-08-11T15:32:13+09:00 [INFO][AUSF][UeAuthPost] Serving network authorized
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AUSF&service-names=nudm-ueau&target-nf-type=UDM |
2022-08-11T15:32:13+09:00 [INFO][UDM][UEAU] Handle GenerateAuthDataRequest
2022-08-11T15:32:13+09:00 [INFO][UDM][Suci] suciPart: [suci 0 001 01 0000 0 0 0000000001]
2022-08-11T15:32:13+09:00 [INFO][UDM][Suci] scheme 0
2022-08-11T15:32:13+09:00 [INFO][UDM][Suci] SUPI type is IMSI
http://127.0.0.10:8000
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=UDM&target-nf-type=UDR |
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle QueryAuthSubsData
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000001/authentication-data/authentication-subscription |
2022-08-11T15:32:13+09:00 [ERRO][UDM][UEAU] opStr length is  0
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle ModifyAuthentication
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 204 |       127.0.0.1 | PATCH   | /nudr-dr/v1/subscription-data/imsi-001010000000001/authentication-data/authentication-subscription |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | POST    | /nudm-ueau/v1/suci-0-001-01-0000-0-0-0000000001/security-information/generate-auth-data |
2022-08-11T15:32:13+09:00 [INFO][AUSF][UeAuthPost] Add SuciSupiPair (suci-0-001-01-0000-0-0-0000000001, imsi-001010000000001) to map.
2022-08-11T15:32:13+09:00 [INFO][AUSF][UeAuthPost] Use 5G AKA auth method
2022-08-11T15:32:13+09:00 [INFO][AUSF][5gAkaAuth] XresStar = 3530333665383435343538376134623066643438396366653232653238656637
2022-08-11T15:32:13+09:00 [INFO][AUSF][GIN] | 201 |       127.0.0.1 | POST    | /nausf-auth/v1/ue-authentications |
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Send Authentication Request
2022-08-11T15:32:13+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Send Downlink Nas Transport
2022-08-11T15:32:13+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-08-11T15:32:13+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [Authentication] to [Authentication]
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Handle Authentication Response
2022-08-11T15:32:13+09:00 [INFO][AUSF][5gAkaAuth] Auth5gAkaComfirmRequest
2022-08-11T15:32:13+09:00 [INFO][AUSF][5gAkaAuth] res*: 3530333665383435343538376134623066643438396366653232653238656637
Xres*: 3530333665383435343538376134623066643438396366653232653238656637
2022-08-11T15:32:13+09:00 [INFO][AUSF][5gAkaAuth] 5G AKA confirmation succeeded
2022-08-11T15:32:13+09:00 [INFO][UDM][UEAU] Handle ConfirmAuthDataRequest
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle CreateAuthenticationStatus
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 204 |       127.0.0.1 | PUT     | /nudr-dr/v1/subscription-data/imsi-001010000000001/authentication-data/authentication-status |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 201 |       127.0.0.1 | POST    | /nudm-ueau/v1/imsi-001010000000001/auth-events |
2022-08-11T15:32:13+09:00 [INFO][AUSF][GIN] | 200 |       127.0.0.1 | PUT     | /nausf-auth/v1/ue-authentications/suci-0-001-01-0000-0-0-0000000001/5g-aka-confirmation |
2022-08-11T15:32:13+09:00 [INFO][LIB][FSM] Handle event[Authentication Success], transition from [Authentication] to [SecurityMode]
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Send Security Mode Command
2022-08-11T15:32:13+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Send Downlink Nas Transport
2022-08-11T15:32:13+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-08-11T15:32:13+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [SecurityMode] to [SecurityMode]
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Handle Security Mode Complete
2022-08-11T15:32:13+09:00 [INFO][LIB][FSM] Handle event[SecurityMode Success], transition from [SecurityMode] to [ContextSetup]
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Handle InitialRegistration
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&supi=imsi-001010000000001&target-nf-type=UDM |
2022-08-11T15:32:13+09:00 [INFO][UDM][SDM] Handle GetNssai
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle QueryAmData
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000001/00101/provisioned-data/am-data?supported-features= |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000001/nssai?plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] RequestedNssai - ServingSnssai: &{Sst:1 Sd:010203}, HomeSnssai: <nil>
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&supi=imsi-001010000000001&target-nf-type=UDM |
2022-08-11T15:32:13+09:00 [INFO][UDM][UECM] Handle RegistrationAmf3gppAccess
2022-08-11T15:32:13+09:00 [INFO][UDM][UECM] UEID: imsi-001010000000001
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle CreateAmfContext3gpp
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 204 |       127.0.0.1 | PUT     | /nudr-dr/v1/subscription-data/imsi-001010000000001/context-data/amf-3gpp-access |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 201 |       127.0.0.1 | PUT     | /nudm-uecm/v1/imsi-001010000000001/registrations/amf-3gpp-access |
2022-08-11T15:32:13+09:00 [INFO][UDM][SDM] Handle GetAmData
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle QueryAmData
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000001/00101/provisioned-data/am-data?supported-features=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000001/am-data?plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-08-11T15:32:13+09:00 [INFO][UDM][SDM] Handle GetSmfSelectData
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle QuerySmfSelectData
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000001/00101/provisioned-data/smf-selection-subscription-data?supported-features= |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000001/smf-select-data?plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-08-11T15:32:13+09:00 [INFO][UDM][SDM] Handle GetUeContextInSmfData
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle QuerySmfRegList
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000001/context-data/smf-registrations?supported-features= |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000001/ue-context-in-smf-data |
2022-08-11T15:32:13+09:00 [INFO][UDM][SDM] Handle Subscribe
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle CreateSdmSubscriptions
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 201 |       127.0.0.1 | POST    | /nudr-dr/v1/subscription-data/imsi-001010000000001/context-data/sdm-subscriptions |
2022-08-11T15:32:13+09:00 [INFO][UDM][GIN] | 201 |       127.0.0.1 | POST    | /nudm-sdm/v1/imsi-001010000000001/sdm-subscriptions |
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?preferred-locality=area1&requester-nf-type=AMF&supi=imsi-001010000000001&target-nf-type=PCF |
2022-08-11T15:32:13+09:00 [INFO][PCF][Ampolicy] Handle AM Policy Create Request
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=PCF&target-nf-type=UDR |
2022-08-11T15:32:13+09:00 [INFO][UDR][DRepo] Handle PolicyDataUesUeIdAmDataGet
2022-08-11T15:32:13+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/policy-data/ues/imsi-001010000000001/am-data |
2022-08-11T15:32:13+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:13+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?guami=%7B%22plmnId%22%3A%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D%2C%22amfId%22%3A%22cafe00%22%7D&requester-nf-type=PCF&target-nf-type=AMF |
2022-08-11T15:32:13+09:00 [INFO][AMF][Comm] Handle AMF Status Change Subscribe Request
2022-08-11T15:32:13+09:00 [INFO][AMF][Comm] new AMF Status Subscription[1]
2022-08-11T15:32:13+09:00 [INFO][AMF][GIN] | 201 |       127.0.0.1 | POST    | /namf-comm/v1/subscriptions |
2022-08-11T15:32:13+09:00 [INFO][PCF][GIN] | 201 |       127.0.0.1 | POST    | /npcf-am-policy-control/v1/policies |
2022-08-11T15:32:13+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Send Registration Accept
2022-08-11T15:32:13+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Send Initial Context Setup Request
2022-08-11T15:32:13+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Handle Initial Context Setup Response
2022-08-11T15:32:14+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-08-11T15:32:14+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [ContextSetup] to [ContextSetup]
2022-08-11T15:32:14+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Handle Registration Complete
2022-08-11T15:32:14+09:00 [INFO][LIB][FSM] Handle event[ContextSetup Success], transition from [ContextSetup] to [Registered]
2022-08-11T15:32:14+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-08-11T15:32:14+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [Registered] to [Registered]
2022-08-11T15:32:14+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Handle UL NAS Transport
2022-08-11T15:32:14+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Transport 5GSM Message to SMF
2022-08-11T15:32:14+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] Select SMF [snssai: {Sst:1 Sd:010203}, dnn: internet2]
2022-08-11T15:32:14+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:14+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&target-nf-type=NSSF |
2022-08-11T15:32:14+09:00 [INFO][NSSF][NsSelect] Handle NSSelectionGet
2022-08-11T15:32:14+09:00 [INFO][NSSF][GIN] | 200 |       127.0.0.1 | GET     | /nnssf-nsselection/v1/network-slice-information?nf-id=a345b53b-4402-4c45-b480-dc9b30eba7d1&nf-type=AMF&slice-info-request-for-pdu-session=%7B%22sNssai%22%3A%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D%2C%22roamingIndication%22%3A%22NON_ROAMING%22%7D |
2022-08-11T15:32:14+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:14+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?dnn=internet2&preferred-locality=area1&requester-nf-type=AMF&service-names=nsmf-pdusession&snssais=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D&target-nf-type=SMF&target-plmn-list=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] Receive Create SM Context Request
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] In HandlePDUSessionSMContextCreate
2022-08-11T15:32:14+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:14+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=SMF&target-nf-type=UDM |
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] Send NF Discovery Serving UDM Successfully
2022-08-11T15:32:14+09:00 [INFO][SMF][CTX] Allocated UE IP address: 10.61.0.1
2022-08-11T15:32:14+09:00 [INFO][SMF][CTX] Selected UPF: UPF1
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] UE[imsi-001010000000001] PDUSessionID[1] IP[10.61.0.1]
2022-08-11T15:32:14+09:00 [INFO][UDM][SDM] Handle GetSmData
2022-08-11T15:32:14+09:00 [INFO][UDM][SDM] getSmDataProcedure: SUPI[imsi-001010000000001] PLMNID[00101] DNN[internet2] SNssai[{"sst":1,"sd":"010203"}]
2022-08-11T15:32:14+09:00 [INFO][UDR][DRepo] Handle QuerySmData
2022-08-11T15:32:14+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000001/00101/provisioned-data/sm-data?single-nssai=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D |
2022-08-11T15:32:14+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000001/sm-data?dnn=internet2&plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D&single-nssai=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D |
2022-08-11T15:32:14+09:00 [INFO][SMF][GSM] In HandlePDUSessionEstablishmentRequest
2022-08-11T15:32:14+09:00 [INFO][NAS][Convert] ProtocolOrContainerList:  [0xc0001c2440 0xc0001c2480]
2022-08-11T15:32:14+09:00 [INFO][SMF][GSM] Protocol Configuration Options
2022-08-11T15:32:14+09:00 [INFO][SMF][GSM] &{[0xc0001c2440 0xc0001c2480]}
2022-08-11T15:32:14+09:00 [INFO][SMF][GSM] Didn't Implement container type IPAddressAllocationViaNASSignallingUL
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] PCF Selection for SMContext SUPI[imsi-001010000000001] PDUSessionID[1]
2022-08-11T15:32:14+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:14+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?preferred-locality=area1&requester-nf-type=SMF&target-nf-type=PCF |
2022-08-11T15:32:14+09:00 [INFO][PCF][SMpolicy] Handle CreateSmPolicy
2022-08-11T15:32:14+09:00 [INFO][UDR][DRepo] Handle PolicyDataUesUeIdSmDataGet
2022-08-11T15:32:14+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/policy-data/ues/imsi-001010000000001/sm-data?dnn=internet2&snssai=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D |
2022-08-11T15:32:14+09:00 [INFO][PCF][GIN] | 201 |       127.0.0.1 | POST    | /npcf-smpolicycontrol/v1/sm-policies |
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] SUPI[imsi-001010000000001] has no pre-config route
2022-08-11T15:32:14+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-08-11T15:32:14+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=SMF&target-nf-instance-id=a345b53b-4402-4c45-b480-dc9b30eba7d1&target-nf-type=AMF |
2022-08-11T15:32:14+09:00 [INFO][SMF][Consumer] SendNFDiscoveryServingAMF ok
2022-08-11T15:32:14+09:00 [INFO][SMF][GIN] | 201 |       127.0.0.1 | POST    | /nsmf-pdusession/v1/sm-contexts |
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] Sending PFCP Session Establishment Request
2022-08-11T15:32:14+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000001] create smContext[pduSessionID: 1] Success
2022-08-11T15:32:14+09:00 [INFO][LIB][PFCP] Remove Request Transaction [3]
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] Received PFCP Session Establishment Accepted Response
2022-08-11T15:32:14+09:00 [INFO][AMF][Producer] Handle N1N2 Message Transfer Request
2022-08-11T15:32:14+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Send PDU Session Resource Setup Request
2022-08-11T15:32:14+09:00 [INFO][AMF][GIN] | 200 |       127.0.0.1 | POST    | /namf-comm/v1/ue-contexts/imsi-001010000000001/n1-n2-messages |
2022-08-11T15:32:14+09:00 [INFO][AMF][NGAP][192.168.0.131:58560][AMF_UE_NGAP_ID:1] Handle PDU Session Resource Setup Response
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] Receive Update SM Context Request
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] In HandlePDUSessionSMContextUpdate
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] Sending PFCP Session Modification Request to AN UPF
2022-08-11T15:32:14+09:00 [INFO][LIB][PFCP] Remove Request Transaction [4]
2022-08-11T15:32:14+09:00 [INFO][SMF][PduSess] Received PFCP Session Modification Accepted Response from AN UPF
2022-08-11T15:32:14+09:00 [INFO][SMF][GIN] | 200 |       127.0.0.1 | POST    | /nsmf-pdusession/v1/sm-contexts/urn:uuid:6dac634f-855e-4c2d-ac03-7f1f5f6a7e8b/modify |

free5GC U-Plane1のログは以下の通りです。

2022-08-11T15:32:14+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805] handleSessionEstablishmentRequest
2022-08-11T15:32:14+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805][rNodeID:192.168.0.141][SEID:L(0x1),R(0x1)] New session
2022-08-11T15:32:14+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805] handleSessionModificationRequest

nr-ueコマンドのコンソールログから、free5GC 5GCからIPアドレス10.61.0.1がUE1に割り当てられたことが分かります。

[2022-08-11 15:32:14.224] [app] [info] Connection setup for PDU session[1] is successful, TUN interface[uesimtun0, 10.61.0.1] is up.

念のため、UE1のTUNインターフェースに割り当てられたIPアドレスと一致していることを確認して下さい。
この場合、UE1が最初に接続されたため、uesimtun1ではなくUE1のTUNnelインターフェイスとしてuesimtun0が作成されています。

# ip addr show
...
5: uesimtun0: <POINTOPOINT,PROMISC,NOTRAILERS,UP,LOWER_UP> mtu 1400 qdisc fq_codel state UNKNOWN group default qlen 500
    link/none 
    inet 10.61.0.1/32 scope global uesimtun0
       valid_lft forever preferred_lft forever
    inet6 fe80::f272:74a3:d7a9:67ef/64 scope link stable-privacy 
       valid_lft forever preferred_lft forever
...

google.comにpingする

UE1のTUNインターフェースを指定して、pingしてみます。

TUNインターフェースの使い方は以下を参照して下さい。

https://github.com/aligungr/UERANSIM/wiki/Usage

DN=10.61.0.0/16を経由する場合

VM2(U-Plane1)でtcpdumpを実行し、if=upfgtpを通過するパケットを確認します。

VM5(UE1)でping google.com

# ping google.com -I uesimtun0 -n
PING google.com (172.217.31.142) from 10.61.0.1 uesimtun0: 56(84) bytes of data.
64 bytes from 172.217.31.142: icmp_seq=1 ttl=61 time=20.6 ms
64 bytes from 172.217.31.142: icmp_seq=2 ttl=61 time=19.2 ms
64 bytes from 172.217.31.142: icmp_seq=3 ttl=61 time=19.0 ms

VM2(U-Plane1)でtcpdumpを実行

# tcpdump -i upfgtp -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on upfgtp, link-type RAW (Raw IP), capture size 262144 bytes
15:36:03.089697 IP 10.61.0.1 > 172.217.31.142: ICMP echo request, id 2, seq 1, length 64
15:36:03.107817 IP 172.217.31.142 > 10.61.0.1: ICMP echo reply, id 2, seq 1, length 64
15:36:04.091273 IP 10.61.0.1 > 172.217.31.142: ICMP echo request, id 2, seq 2, length 64
15:36:04.108420 IP 172.217.31.142 > 10.61.0.1: ICMP echo reply, id 2, seq 2, length 64
15:36:05.092968 IP 10.61.0.1 > 172.217.31.142: ICMP echo request, id 2, seq 3, length 64
15:36:05.110258 IP 172.217.31.142 > 10.61.0.1: ICMP echo reply, id 2, seq 3, length 64

また、以下のようにnr-binderツールにおいて、TUNインターフェースに割り当てられたIPアドレスを指定して、大半のアプリケーションを使用することができます。

VM5(UE1)でcurl google.comを実行

# sh nr-binder 10.61.0.1 curl google.com
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML>

VM2(U-Plane1)でtcpdumpを実行

15:36:56.056456 IP 10.61.0.1.47427 > 172.217.31.142.80: Flags [S], seq 3415222222, win 65280, options [mss 1360,sackOK,TS val 3115568996 ecr 0,nop,wscale 7], length 0
15:36:56.074653 IP 172.217.31.142.80 > 10.61.0.1.47427: Flags [S.], seq 11904001, ack 3415222223, win 65535, options [mss 1460], length 0
15:36:56.076945 IP 10.61.0.1.47427 > 172.217.31.142.80: Flags [.], ack 1, win 65280, length 0
15:36:56.077372 IP 10.61.0.1.47427 > 172.217.31.142.80: Flags [P.], seq 1:75, ack 1, win 65280, length 74: HTTP: GET / HTTP/1.1
15:36:56.077567 IP 172.217.31.142.80 > 10.61.0.1.47427: Flags [.], ack 75, win 65535, length 0
15:36:56.139017 IP 172.217.31.142.80 > 10.61.0.1.47427: Flags [P.], seq 1:529, ack 75, win 65535, length 528: HTTP: HTTP/1.1 301 Moved Permanently
15:36:56.142108 IP 10.61.0.1.47427 > 172.217.31.142.80: Flags [.], ack 529, win 64752, length 0
15:36:56.144943 IP 10.61.0.1.47427 > 172.217.31.142.80: Flags [F.], seq 75, ack 529, win 64752, length 0
15:36:56.145142 IP 172.217.31.142.80 > 10.61.0.1.47427: Flags [.], ack 76, win 65535, length 0
15:36:56.163936 IP 172.217.31.142.80 > 10.61.0.1.47427: Flags [F.], seq 529, ack 76, win 65535, length 0
15:36:56.165784 IP 10.61.0.1.47427 > 172.217.31.142.80: Flags [.], ack 530, win 64752, length 0

なお、nr-binderはpingでは機能しません。理由はこちらを参照して下さい。

UE0, UE2-UE4についても同様に、各U-Planeでtcpdumpを実行し、upfgtpを通過するパケットを確認して下さい。

以上で、DNの端点にTUNインターフェースを作成し、DNに任意のパケットを流せるようになり、SA構成のローカル5Gを想定した5GCのシミュレーション携帯網として、MECを試す環境を構築できました。

最後に

free5GCは台湾の国立交通大学(NCTU)主導で開発され、2020年4月にリリースされたv3.0.0からSA構成が試せるようになりました。当時は、UERANSIMのような使い勝手の良い基地局と端末のシミュレータが無く、試しづらい状況が続きましたが、今では手軽に試せるようになりました。
なお、国内では、5GCとしてfree5GCの人気が高いように思いますが、Open5GSというオープンソースもあります。こちらは、5GCの機能の他に、4GのCU分離対応EPCの機能も有しています。このEPCのHSSは基本的なCxインターフェースに対応していて、例えば、プライベートLTEでVoLTEを試すことができます。また、CSFBとSMSoS(SMS over SGs)にも対応していますので、ちょっとした自営のVoLTE/SMS携帯電話網を構築出来て、面白いかもしれません。

5GCで導入されたCU分離は携帯網のサービス化とMECを実現する上で、有用なアーキテクチャと思います。

最後に、元記事はGithubに書いたものです。UERANSIMのチュートリアルからもリンクして頂きました。

主な変更履歴

[2022.08.29] free5GC v3.2.1に対応。
[2022.07.13] free5GC v3.1.0に対応し、UERANSIM v3.2.6に対応。
[2022.03.12] 初版。

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