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Open5GS 5GCとUERANSIM UE/RANでS-NSSAIに基づいてUPFを選択する設定

Last updated at 2023-03-28Posted at 2022-09-13

本記事は、Open5GSとUERANSIMを使用して、UEに設定したスライス識別子のS-NSSAIに基づいて、UPFを選択する場合の簡単な設定について説明します。これにより、ネットワークスライシングを実現する際の設定のヒントになることを期待しています。
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。

Open5GS 5GCのシミュレーション携帯網の概要

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。

UEに設定したスライス識別子S-NSSAIに基づいて、SMFとUPFのペアを選択します。

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 - Open5GS v2.4.9 - https://github.com/open5gs/open5gs
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	Open5GS 5GC C-Plane	192.168.0.111/24 192.168.0.112/24 192.168.0.113/24	Ubuntu 20.04	1GB	20GB
VM2	Open5GS 5GC U-Plane1	192.168.0.114/24	Ubuntu 20.04	1GB	20GB
VM3	Open5GS 5GC U-Plane2	192.168.0.115/24	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

AMFとSMFのIPアドレスは以下の通りです。

NF	IP address	IP address on SBI	Supported S-NSSAI
AMF	192.168.0.111	127.0.0.5	SST:1, SD:0x000001 SST:1, SD:0x000002
SMF1	192.168.0.112	127.0.0.4	SST:1, SD:0x000001
SMF2	192.168.0.113	127.0.0.24	SST:1, SD:0x000002

gNodeBの情報は以下の通りです。(その他の項目はデフォルト値)

IP address	Supported S-NSSAI
192.168.0.131	SST:1, SD:0x000001 SST:1, SD:0x000002

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	S-NSSAI
UE	001010000000000	internet	OPc	SST:1, SD:0x000001 SST:1, SD:0x000002

これらの情報の登録には、Open5GS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	S-NSSAI	TUNnel interface of DN	DNN	TUNnel interface of UE	U-Plane #
10.45.0.0/16	SST:1 SD:0x000001	ogstun	internet	uesimtun0	U-Plane1
10.46.0.0/16	SST:1 SD:0x000002	ogstun	internet	uesimtun0	U-Plane2

Open5GS 5GCとUERANSIM UE/RANの設定ファイルの変更点

Open5GSとUERANSIMのビルド方法は以下を参照して下さい。

Open5GS v2.4.9 - https://open5gs.org/open5gs/docs/guide/02-building-open5gs-from-sources/
UERANSIM v3.2.6 - https://github.com/aligungr/UERANSIM/wiki/Installation

Open5GS 5GC C-Planeの設定ファイルの変更点

open5gs/install/etc/open5gs/amf.yaml

--- amf.yaml.orig       2022-07-30 23:08:52.000000000 +0900
+++ amf.yaml    2022-07-30 23:12:28.000000000 +0900
@@ -229,25 +229,28 @@
       - addr: 127.0.0.5
         port: 7777
     ngap:
-      - addr: 127.0.0.5
+      - addr: 192.168.0.111
     guami:
       - plmn_id:
-          mcc: 999
-          mnc: 70
+          mcc: 001
+          mnc: 01
         amf_id:
           region: 2
           set: 1
     tai:
       - plmn_id:
-          mcc: 999
-          mnc: 70
+          mcc: 001
+          mnc: 01
         tac: 1
     plmn_support:
       - plmn_id:
-          mcc: 999
-          mnc: 70
+          mcc: 001
+          mnc: 01
         s_nssai:
           - sst: 1
+            sd: 000001
+          - sst: 1
+            sd: 000002
     security:
         integrity_order : [ NIA2, NIA1, NIA0 ]
         ciphering_order : [ NEA0, NEA1, NEA2 ]

open5gs/install/etc/open5gs/smf1.yaml

--- smf.yaml.orig       2022-07-30 23:08:52.000000000 +0900
+++ smf1.yaml   2022-07-30 23:14:08.000000000 +0900
@@ -381,17 +381,14 @@
       - addr: 127.0.0.4
         port: 7777
     pfcp:
-      - addr: 127.0.0.4
-      - addr: ::1
+      - addr: 192.168.0.112
     gtpc:
       - addr: 127.0.0.4
-      - addr: ::1
     gtpu:
-      - addr: 127.0.0.4
-      - addr: ::1
+      - addr: 192.168.0.112
     subnet:
       - addr: 10.45.0.1/16
-      - addr: 2001:db8:cafe::1/48
+        dnn: internet
     dns:
       - 8.8.8.8
       - 8.8.4.4
@@ -400,7 +397,18 @@
     mtu: 1400
     ctf:
       enabled: auto
-    freeDiameter: /root/open5gs/install/etc/freeDiameter/smf.conf
+    freeDiameter: /root/open5gs/install/etc/freeDiameter/smf1.conf
+    info:
+      - s_nssai:
+          - sst: 1
+            sd: 000001
+            dnn:
+              - internet
+        tai:
+          - plmn_id:
+              mcc: 001
+              mnc: 01
+            tac: 1
 
 #
 # nrf:
@@ -501,7 +509,8 @@
 #
 upf:
     pfcp:
-      - addr: 127.0.0.7
+      - addr: 192.168.0.114
+        dnn: internet
 
 #
 # parameter:

open5gs/install/etc/open5gs/smf2.yaml

--- smf.yaml.orig       2022-07-30 23:08:52.000000000 +0900
+++ smf2.yaml   2022-07-30 23:15:32.000000000 +0900
@@ -378,20 +378,17 @@
 
 smf:
     sbi:
-      - addr: 127.0.0.4
+      - addr: 127.0.0.24
         port: 7777
     pfcp:
-      - addr: 127.0.0.4
-      - addr: ::1
+      - addr: 192.168.0.113
     gtpc:
-      - addr: 127.0.0.4
-      - addr: ::1
+      - addr: 127.0.0.24
     gtpu:
-      - addr: 127.0.0.4
-      - addr: ::1
+      - addr: 192.168.0.113
     subnet:
-      - addr: 10.45.0.1/16
-      - addr: 2001:db8:cafe::1/48
+      - addr: 10.46.0.1/16
+        dnn: internet
     dns:
       - 8.8.8.8
       - 8.8.4.4
@@ -400,7 +397,18 @@
     mtu: 1400
     ctf:
       enabled: auto
-    freeDiameter: /root/open5gs/install/etc/freeDiameter/smf.conf
+    freeDiameter: /root/open5gs/install/etc/freeDiameter/smf2.conf
+    info:
+      - s_nssai:
+          - sst: 1
+            sd: 000002
+            dnn:
+              - internet
+        tai:
+          - plmn_id:
+              mcc: 001
+              mnc: 01
+            tac: 1
 
 #
 # nrf:
@@ -501,7 +509,8 @@
 #
 upf:
     pfcp:
-      - addr: 127.0.0.7
+      - addr: 192.168.0.115
+        dnn: internet
 
 #
 # parameter:

open5gs/install/etc/open5gs/nssf.yaml

--- nssf.yaml.orig      2022-07-30 23:08:52.000000000 +0900
+++ nssf.yaml   2022-07-31 14:58:14.000000000 +0900
@@ -139,10 +139,16 @@
       - addr: 127.0.0.14
         port: 7777
     nsi:
-      - addr: ::1
+      - addr: 127.0.0.10
         port: 7777
         s_nssai:
           sst: 1
+          sd: 000001
+      - addr: 127.0.0.10
+        port: 7777
+        s_nssai:
+          sst: 1
+          sd: 000002
 
 #
 # nrf:

open5gs/install/etc/freeDiameter/smf1.conf

smf1.confは元のsmf.confと同じです。

open5gs/install/etc/freeDiameter/smf2.conf

--- smf.conf.orig       2021-08-09 14:06:48.000000000 +0000
+++ smf2.conf   2021-08-09 16:01:40.000000000 +0000
@@ -79,7 +79,7 @@
 #ListenOn = "202.249.37.5";
 #ListenOn = "2001:200:903:2::202:1";
 #ListenOn = "fe80::21c:5ff:fe98:7d62%eth0";
-ListenOn = "127.0.0.4";
+ListenOn = "127.0.0.24";
 
 
 ##############################################################

Open5GS 5GC U-Plane1の設定ファイルの変更点

open5gs/install/etc/open5gs/upf.yaml

--- upf.yaml.orig       2022-07-30 23:10:12.000000000 +0900
+++ upf.yaml    2022-07-30 23:14:48.000000000 +0900
@@ -166,12 +166,13 @@
 #
 upf:
     pfcp:
-      - addr: 127.0.0.7
+      - addr: 192.168.0.114
     gtpu:
-      - addr: 127.0.0.7
+      - addr: 192.168.0.114
     subnet:
       - addr: 10.45.0.1/16
-      - addr: 2001:db8:cafe::1/48
+        dnn: internet
+        dev: ogstun
 
 #
 # smf:

Open5GS 5GC U-Plane2の設定ファイルの変更点

open5gs/install/etc/open5gs/upf.yaml

--- upf.yaml.orig       2022-07-30 23:10:36.000000000 +0900
+++ upf.yaml    2022-07-30 23:15:06.000000000 +0900
@@ -166,12 +166,13 @@
 #
 upf:
     pfcp:
-      - addr: 127.0.0.7
+      - addr: 192.168.0.115
     gtpu:
-      - addr: 127.0.0.7
+      - addr: 192.168.0.115
     subnet:
-      - addr: 10.45.0.1/16
-      - addr: 2001:db8:cafe::1/48
+      - addr: 10.46.0.1/16
+        dnn: internet
+        dev: ogstun
 
 #
 # smf:

UERANSIM UE/RANの設定ファイルの変更点

RAN(gNodeB)の設定ファイルの変更点

UERANSIM/config/open5gs-gnb.yaml

--- open5gs-gnb.yaml.orig       2022-07-03 13:06:44.000000000 +0900
+++ open5gs-gnb.yaml    2022-07-29 20:40:56.000000000 +0900
@@ -1,22 +1,25 @@
-mcc: '999'          # Mobile Country Code value
-mnc: '70'           # 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: 127.0.0.5
+  - address: 192.168.0.111
     port: 38412
 
 # List of supported S-NSSAIs by this gNB
 slices:
   - sst: 1
+    sd: 0x000001
+  - sst: 1
+    sd: 0x000002
 
 # Indicates whether or not SCTP stream number errors should be ignored.
 ignoreStreamIds: true

SST:1 & SD:0x000001のUE(IMSI-001010000000000)の設定ファイルの変更点

UERANSIM/config/open5gs-ue-sd1.yaml

--- open5gs-ue.yaml.orig        2022-07-03 13:06:44.000000000 +0900
+++ open5gs-ue-sd1.yaml 2022-07-29 20:42:40.000000000 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-999700000000001'
+supi: 'imsi-001010000000000'
 # Mobile Country Code value of HPLMN
-mcc: '999'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '70'
+mnc: '01'
 
 # Permanent subscription key
 key: '465B5CE8B199B49FAA5F0A2EE238A6BC'
@@ -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:
@@ -42,15 +42,17 @@
     apn: 'internet'
     slice:
       sst: 1
+      sd: 0x000001
 
 # Configured NSSAI for this UE by HPLMN
 configured-nssai:
   - sst: 1
+    sd: 0x000001
 
 # Default Configured NSSAI for this UE
 default-nssai:
   - sst: 1
-    sd: 1
+    sd: 0x000001
 
 # Supported integrity algorithms by this UE
 integrity:

SST:1 & SD:0x000002のUE(IMSI-001010000000000)の設定ファイルの変更点

UERANSIM/config/open5gs-ue-sd2.yaml

--- open5gs-ue.yaml.orig        2022-07-03 13:06:44.000000000 +0900
+++ open5gs-ue-sd2.yaml 2022-07-29 20:42:50.000000000 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-999700000000001'
+supi: 'imsi-001010000000000'
 # Mobile Country Code value of HPLMN
-mcc: '999'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '70'
+mnc: '01'
 
 # Permanent subscription key
 key: '465B5CE8B199B49FAA5F0A2EE238A6BC'
@@ -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:
@@ -42,15 +42,17 @@
     apn: 'internet'
     slice:
       sst: 1
+      sd: 0x000002
 
 # Configured NSSAI for this UE by HPLMN
 configured-nssai:
   - sst: 1
+    sd: 0x000002
 
 # Default Configured NSSAI for this UE
 default-nssai:
   - sst: 1
-    sd: 1
+    sd: 0x000002
 
 # Supported integrity algorithms by this UE
 integrity:

Open5GS 5GCとUERANSIM UE/RANのネットワーク設定

Open5GS 5GC C-Planeのネットワーク設定

SMF1とSMF2に以下の通りIPアドレスを追加します。

ip addr add 192.168.0.112/24 dev enp0s8
ip addr add 192.168.0.113/24 dev enp0s8

注意。本記事のVirtualBoxの環境では、enp0s8は192.168.0.0/24のネットワークインターフェースです。環境に応じて変更して下さい。

Open5GS 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、TUNインターフェースとNAPTを設定します。

ip tuntap add name ogstun mode tun
ip addr add 10.45.0.1/16 dev ogstun
ip link set ogstun up

iptables -t nat -A POSTROUTING -s 10.45.0.0/16 ! -o ogstun -j MASQUERADE

Open5GS 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、TUNインターフェースとNAPTを設定します。

ip tuntap add name ogstun mode tun
ip addr add 10.46.0.1/16 dev ogstun
ip link set ogstun up

iptables -t nat -A POSTROUTING -s 10.46.0.0/16 ! -o ogstun -j MASQUERADE

Open5GSとUERANSIMのビルド

Open5GSとUERANSIMのビルド方法は以下を参照して下さい。

Open5GS v2.4.9 - https://open5gs.org/open5gs/docs/guide/02-building-open5gs-from-sources/
UERANSIM v3.2.6 - https://github.com/aligungr/UERANSIM/wiki/Installation

注意。Open5GS 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、Open5GS 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。

Open5GS 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。

Open5GS 5GC C-Planeを実行

Open5GS 5GC C-Plane

./install/bin/open5gs-nrfd &
sleep 2
./install/bin/open5gs-amfd &
sleep 2
./install/bin/open5gs-smfd -c install/etc/open5gs/smf1.yaml &
./install/bin/open5gs-smfd -c install/etc/open5gs/smf2.yaml &
./install/bin/open5gs-ausfd &
./install/bin/open5gs-udmd &
./install/bin/open5gs-udrd &
./install/bin/open5gs-pcfd &
./install/bin/open5gs-nssfd &
./install/bin/open5gs-bsfd &

Open5GS 5GC U-Plane1とU-Plane2を実行

次に、Open5GS 5GC U-Planeを起動します。

Open5GS 5GC U-Plane1

./install/bin/open5gs-upfd &

Open5GS 5GC U-Plane2

./install/bin/open5gs-upfd &

また、各U-PlaneのVMに追加で端末を開き、tcpdumpを実行します。

VM2 (U-Plane1)でtcpdumpを実行

# tcpdump -i ogstun -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ogstun, link-type RAW (Raw IP), capture size 262144 bytes

VM3 (U-Plane2)でtcpdumpを実行

# tcpdump -i ogstun -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ogstun, link-type RAW (Raw IP), capture size 262144 bytes

UERANSIM(gNodeB)を実行

UERANSIMの使い方は以下を参照して下さい。

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

次のようにgNBを起動します。

# ./nr-gnb -c ../config/open5gs-gnb.yaml
UERANSIM v3.2.6
[2022-08-01 20:15:30.134] [sctp] [info] Trying to establish SCTP connection... (192.168.0.111:38412)
[2022-08-01 20:15:30.137] [sctp] [info] SCTP connection established (192.168.0.111:38412)
[2022-08-01 20:15:30.137] [sctp] [debug] SCTP association setup ascId[7]
[2022-08-01 20:15:30.137] [ngap] [debug] Sending NG Setup Request
[2022-08-01 20:15:30.138] [ngap] [debug] NG Setup Response received
[2022-08-01 20:15:30.138] [ngap] [info] NG Setup procedure is successful

Open5GS C-Planeのログは以下の通りです。

08/01 20:15:30.118: [amf] INFO: gNB-N2 accepted[192.168.0.131]:47393 in ng-path module (../src/amf/ngap-sctp.c:113)
08/01 20:15:30.118: [amf] INFO: gNB-N2 accepted[192.168.0.131] in master_sm module (../src/amf/amf-sm.c:660)
08/01 20:15:30.118: [amf] INFO: [Added] Number of gNBs is now 1 (../src/amf/context.c:877)
08/01 20:15:30.118: [amf] INFO: gNB-N2[192.168.0.131] max_num_of_ostreams : 10 (../src/amf/amf-sm.c:699)

UERANSIM(SST:1 & SD:0x000001のUE(IMSI-001010000000000))を実行

パケットが、SST:1 & SD:0x000001に基づいて接続したU-Plane1のDNを通過することを確認します。

SST:1 & SD:0x000001に基づいてU-Plane1に接続したUE(IMSI-001010000000000)を開始

# ./nr-ue -c ../config/open5gs-ue-sd1.yaml 
UERANSIM v3.2.6
[2022-08-01 20:16:02.217] [nas] [info] UE switches to state [MM-DEREGISTERED/PLMN-SEARCH]
[2022-08-01 20:16:02.218] [rrc] [debug] New signal detected for cell[1], total [1] cells in coverage
[2022-08-01 20:16:02.219] [nas] [info] Selected plmn[001/01]
[2022-08-01 20:16:02.219] [rrc] [info] Selected cell plmn[001/01] tac[1] category[SUITABLE]
[2022-08-01 20:16:02.220] [nas] [info] UE switches to state [MM-DEREGISTERED/PS]
[2022-08-01 20:16:02.220] [nas] [info] UE switches to state [MM-DEREGISTERED/NORMAL-SERVICE]
[2022-08-01 20:16:02.221] [nas] [debug] Initial registration required due to [MM-DEREG-NORMAL-SERVICE]
[2022-08-01 20:16:02.221] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-08-01 20:16:02.222] [nas] [debug] Sending Initial Registration
[2022-08-01 20:16:02.222] [rrc] [debug] Sending RRC Setup Request
[2022-08-01 20:16:02.222] [nas] [info] UE switches to state [MM-REGISTER-INITIATED]
[2022-08-01 20:16:02.223] [rrc] [info] RRC connection established
[2022-08-01 20:16:02.223] [rrc] [info] UE switches to state [RRC-CONNECTED]
[2022-08-01 20:16:02.223] [nas] [info] UE switches to state [CM-CONNECTED]
[2022-08-01 20:16:02.230] [nas] [debug] Authentication Request received
[2022-08-01 20:16:02.233] [nas] [debug] Security Mode Command received
[2022-08-01 20:16:02.234] [nas] [debug] Selected integrity[2] ciphering[0]
[2022-08-01 20:16:02.250] [nas] [debug] Registration accept received
[2022-08-01 20:16:02.250] [nas] [info] UE switches to state [MM-REGISTERED/NORMAL-SERVICE]
[2022-08-01 20:16:02.250] [nas] [debug] Sending Registration Complete
[2022-08-01 20:16:02.251] [nas] [info] Initial Registration is successful
[2022-08-01 20:16:02.251] [nas] [debug] Sending PDU Session Establishment Request
[2022-08-01 20:16:02.252] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-08-01 20:16:02.458] [nas] [debug] Configuration Update Command received
[2022-08-01 20:16:02.478] [nas] [debug] PDU Session Establishment Accept received
[2022-08-01 20:16:02.482] [nas] [info] PDU Session establishment is successful PSI[1]
[2022-08-01 20:16:02.505] [app] [info] Connection setup for PDU session[1] is successful, TUN interface[uesimtun0, 10.45.0.2] is up.

Open5GS C-Planeのログは以下の通りです。

08/01 20:16:02.218: [amf] INFO: InitialUEMessage (../src/amf/ngap-handler.c:361)
08/01 20:16:02.218: [amf] INFO: [Added] Number of gNB-UEs is now 1 (../src/amf/context.c:2087)
08/01 20:16:02.218: [amf] INFO:     RAN_UE_NGAP_ID[1] AMF_UE_NGAP_ID[1] TAC[1] CellID[0x10] (../src/amf/ngap-handler.c:497)
08/01 20:16:02.218: [amf] INFO: [suci-0-001-01-0000-0-0-0000000000] Unknown UE by SUCI (../src/amf/context.c:1409)
08/01 20:16:02.218: [amf] INFO: [Added] Number of AMF-UEs is now 1 (../src/amf/context.c:1203)
08/01 20:16:02.218: [gmm] INFO: Registration request (../src/amf/gmm-sm.c:135)
08/01 20:16:02.218: [gmm] INFO: [suci-0-001-01-0000-0-0-0000000000]    SUCI (../src/amf/gmm-handler.c:149)
08/01 20:16:02.218: [app] WARNING: Try to discover [AUSF] (../lib/sbi/path.c:114)
08/01 20:16:02.219: [amf] INFO: [3e685d3e-118b-41ed-91da-a58423211b8e] (NF-discover) NF registered (../src/amf/nnrf-handler.c:315)
08/01 20:16:02.219: [amf] INFO: [3e685d3e-118b-41ed-91da-a58423211b8e] (NF-discover) NF Profile updated (../src/amf/nnrf-handler.c:357)
08/01 20:16:02.220: [app] WARNING: Try to discover [UDM] (../lib/sbi/path.c:114)
08/01 20:16:02.221: [ausf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF registered (../src/ausf/nnrf-handler.c:293)
08/01 20:16:02.222: [ausf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF Profile updated (../src/ausf/nnrf-handler.c:335)
08/01 20:16:02.229: [app] WARNING: Try to discover [UDM] (../lib/sbi/path.c:114)
08/01 20:16:02.231: [amf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF registered (../src/amf/nnrf-handler.c:315)
08/01 20:16:02.231: [amf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF Profile updated (../src/amf/nnrf-handler.c:357)
08/01 20:16:02.236: [app] WARNING: Try to discover [PCF] (../lib/sbi/path.c:114)
08/01 20:16:02.237: [amf] INFO: [3e6e1594-118b-41ed-b12a-b7f7384a6776] (NF-discover) NF registered (../src/amf/nnrf-handler.c:315)
08/01 20:16:02.237: [amf] INFO: [3e6e1594-118b-41ed-b12a-b7f7384a6776] (NF-discover) NF Profile updated (../src/amf/nnrf-handler.c:357)
08/01 20:16:02.239: [app] WARNING: Try to discover [UDR] (../lib/sbi/path.c:114)
08/01 20:16:02.240: [pcf] INFO: [3e6e48c0-118b-41ed-bf3e-c34420bc5ec2] (NF-discover) NF registered (../src/pcf/nnrf-handler.c:295)
08/01 20:16:02.241: [pcf] INFO: [3e6e48c0-118b-41ed-bf3e-c34420bc5ec2] (NF-discover) NF Profile updated (../src/pcf/nnrf-handler.c:337)
08/01 20:16:02.448: [gmm] INFO: [imsi-001010000000000] Registration complete (../src/amf/gmm-sm.c:1116)
08/01 20:16:02.449: [amf] INFO: [imsi-001010000000000] Configuration update command (../src/amf/nas-path.c:430)
08/01 20:16:02.450: [gmm] INFO:     UTC [2022-08-01T11:16:02] Timezone[0]/DST[0] (../src/amf/gmm-build.c:531)
08/01 20:16:02.451: [gmm] INFO:     LOCAL [2022-08-01T20:16:02] Timezone[32400]/DST[0] (../src/amf/gmm-build.c:536)
08/01 20:16:02.452: [amf] INFO: [Added] Number of AMF-Sessions is now 1 (../src/amf/context.c:2101)
08/01 20:16:02.452: [gmm] INFO: UE SUPI[imsi-001010000000000] DNN[internet] S_NSSAI[SST:1 SD:0x1] (../src/amf/gmm-handler.c:1061)
08/01 20:16:02.454: [smf] INFO: [Added] Number of SMF-UEs is now 1 (../src/smf/context.c:892)
08/01 20:16:02.454: [smf] INFO: [Added] Number of SMF-Sessions is now 1 (../src/smf/context.c:2972)
08/01 20:16:02.455: [app] WARNING: Try to discover [UDM] (../lib/sbi/path.c:114)
08/01 20:16:02.457: [smf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF registered (../src/smf/nnrf-handler.c:294)
08/01 20:16:02.457: [smf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF Profile updated (../src/smf/nnrf-handler.c:336)
08/01 20:16:02.461: [app] WARNING: Try to discover [PCF] (../lib/sbi/path.c:114)
08/01 20:16:02.462: [smf] INFO: [3e6e1594-118b-41ed-b12a-b7f7384a6776] (NF-discover) NF registered (../src/smf/nnrf-handler.c:294)
08/01 20:16:02.463: [smf] INFO: [3e6e1594-118b-41ed-b12a-b7f7384a6776] (NF-discover) NF Profile updated (../src/smf/nnrf-handler.c:336)
08/01 20:16:02.464: [app] WARNING: Try to discover [BSF] (../lib/sbi/path.c:114)
08/01 20:16:02.465: [pcf] INFO: [3e67d5ee-118b-41ed-bdca-cbde4c328270] (NF-discover) NF registered (../src/pcf/nnrf-handler.c:295)
08/01 20:16:02.465: [pcf] INFO: [3e67d5ee-118b-41ed-bdca-cbde4c328270] (NF-discover) NF Profile updated (../src/pcf/nnrf-handler.c:337)
08/01 20:16:02.467: [smf] INFO: UE SUPI[imsi-001010000000000] DNN[internet] IPv4[10.45.0.2] IPv6[] (../src/smf/npcf-handler.c:497)
08/01 20:16:02.467: [gtp] INFO: gtp_connect() [192.168.0.114]:2152 (../lib/gtp/path.c:60)
08/01 20:16:02.468: [app] WARNING: Try to discover [AMF] (../lib/sbi/path.c:114)
08/01 20:16:02.469: [smf] INFO: [3e6c41ba-118b-41ed-8f0e-9910239c71cb] (NF-discover) NF registered (../src/smf/nnrf-handler.c:294)
08/01 20:16:02.469: [smf] INFO: [3e6c41ba-118b-41ed-8f0e-9910239c71cb] (NF-discover) NF Profile updated (../src/smf/nnrf-handler.c:336)

Open5GS U-Plane1のログは以下の通りです。

08/01 20:16:02.480: [upf] INFO: [Added] Number of UPF-Sessions is now 1 (../src/upf/context.c:178)
08/01 20:16:02.480: [gtp] INFO: gtp_connect() [192.168.0.112]:2152 (../lib/gtp/path.c:60)
08/01 20:16:02.480: [upf] INFO: UE F-SEID[CP:0x1 UP:0x1] APN[internet] PDN-Type[1] IPv4[10.45.0.2] IPv6[] (../src/upf/context.c:397)
08/01 20:16:02.480: [upf] INFO: UE F-SEID[CP:0x1 UP:0x1] APN[internet] PDN-Type[1] IPv4[10.45.0.2] IPv6[] (../src/upf/context.c:397)
08/01 20:16:02.486: [gtp] INFO: gtp_connect() [192.168.0.131]:2152 (../lib/gtp/path.c:60)

TUNnelインターフェースuesimtun0は次のように作成され、IPアドレス10.45.0.2がUEに割り当てられたことが分かります。

# ip addr show
...
7: uesimtun0: <POINTOPOINT,PROMISC,NOTRAILERS,UP,LOWER_UP> mtu 1400 qdisc fq_codel state UNKNOWN group default qlen 500
    link/none 
    inet 10.45.0.2/32 scope global uesimtun0
       valid_lft forever preferred_lft forever
    inet6 fe80::2bbb:2396:796e:28ac/64 scope link stable-privacy 
       valid_lft forever preferred_lft forever
...

U-Plane1のDN=10.45.0.0/16を経由してgoogle.comにpingする

tcpdumpを使用して、パケットがU-Plane1のif=ogstunを通過することを確認します。

# ping google.com -I uesimtun0 -n
PING google.com (142.251.42.174) from 10.45.0.2 uesimtun0: 56(84) bytes of data.
64 bytes from 142.251.42.174: icmp_seq=1 ttl=61 time=22.7 ms
64 bytes from 142.251.42.174: icmp_seq=2 ttl=61 time=18.2 ms
64 bytes from 142.251.42.174: icmp_seq=3 ttl=61 time=18.1 ms

U-Plane1のtcpdumpのログは以下の通りです。

20:17:43.059993 IP 10.45.0.2 > 142.251.42.174: ICMP echo request, id 2, seq 1, length 64
20:17:43.080002 IP 142.251.42.174 > 10.45.0.2: ICMP echo reply, id 2, seq 1, length 64
20:17:44.061849 IP 10.45.0.2 > 142.251.42.174: ICMP echo request, id 2, seq 2, length 64
20:17:44.077792 IP 142.251.42.174 > 10.45.0.2: ICMP echo reply, id 2, seq 2, length 64
20:17:45.063884 IP 10.45.0.2 > 142.251.42.174: ICMP echo request, id 2, seq 3, length 64
20:17:45.079653 IP 142.251.42.174 > 10.45.0.2: ICMP echo reply, id 2, seq 3, length 64

注意。パケットがU-Plane2を通過しないことを確認して下さい。UEは、SST:1 & SD:0x000001に基づいて選択したU-Plane1のDNに接続します。

UERANSIM(SST:1 & SD:0x000002のUE(IMSI-001010000000000))を実行

パケットが、SST:1 & SD:0x000002に基づいて接続したU-Plane2のDNを通過することを確認します。

SST:1 & SD:0x000002に基づいてU-Plane2に接続したUE(IMSI-001010000000000)を開始

# ./nr-ue -c ../config/open5gs-ue-sd2.yaml 
UERANSIM v3.2.6
[2022-08-01 20:19:07.085] [nas] [info] UE switches to state [MM-DEREGISTERED/PLMN-SEARCH]
[2022-08-01 20:19:07.085] [rrc] [debug] New signal detected for cell[1], total [1] cells in coverage
[2022-08-01 20:19:07.086] [nas] [info] Selected plmn[001/01]
[2022-08-01 20:19:07.086] [rrc] [info] Selected cell plmn[001/01] tac[1] category[SUITABLE]
[2022-08-01 20:19:07.086] [nas] [info] UE switches to state [MM-DEREGISTERED/PS]
[2022-08-01 20:19:07.086] [nas] [info] UE switches to state [MM-DEREGISTERED/NORMAL-SERVICE]
[2022-08-01 20:19:07.087] [nas] [debug] Initial registration required due to [MM-DEREG-NORMAL-SERVICE]
[2022-08-01 20:19:07.087] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-08-01 20:19:07.087] [nas] [debug] Sending Initial Registration
[2022-08-01 20:19:07.088] [nas] [info] UE switches to state [MM-REGISTER-INITIATED]
[2022-08-01 20:19:07.088] [rrc] [debug] Sending RRC Setup Request
[2022-08-01 20:19:07.089] [rrc] [info] RRC connection established
[2022-08-01 20:19:07.089] [rrc] [info] UE switches to state [RRC-CONNECTED]
[2022-08-01 20:19:07.090] [nas] [info] UE switches to state [CM-CONNECTED]
[2022-08-01 20:19:07.099] [nas] [debug] Authentication Request received
[2022-08-01 20:19:07.103] [nas] [debug] Security Mode Command received
[2022-08-01 20:19:07.103] [nas] [debug] Selected integrity[2] ciphering[0]
[2022-08-01 20:19:07.113] [nas] [debug] Registration accept received
[2022-08-01 20:19:07.113] [nas] [info] UE switches to state [MM-REGISTERED/NORMAL-SERVICE]
[2022-08-01 20:19:07.114] [nas] [debug] Sending Registration Complete
[2022-08-01 20:19:07.114] [nas] [info] Initial Registration is successful
[2022-08-01 20:19:07.114] [nas] [debug] Sending PDU Session Establishment Request
[2022-08-01 20:19:07.114] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-08-01 20:19:07.318] [nas] [debug] Configuration Update Command received
[2022-08-01 20:19:07.338] [nas] [debug] PDU Session Establishment Accept received
[2022-08-01 20:19:07.343] [nas] [info] PDU Session establishment is successful PSI[1]
[2022-08-01 20:19:07.366] [app] [info] Connection setup for PDU session[1] is successful, TUN interface[uesimtun0, 10.46.0.2] is up.

Open5GS C-Planeのログは以下の通りです。

08/01 20:19:07.087: [amf] INFO: InitialUEMessage (../src/amf/ngap-handler.c:361)
08/01 20:19:07.088: [amf] INFO: [Added] Number of gNB-UEs is now 1 (../src/amf/context.c:2087)
08/01 20:19:07.088: [amf] INFO:     RAN_UE_NGAP_ID[1] AMF_UE_NGAP_ID[2] TAC[1] CellID[0x10] (../src/amf/ngap-handler.c:497)
08/01 20:19:07.089: [amf] INFO: [suci-0-001-01-0000-0-0-0000000000] known UE by SUCI (../src/amf/context.c:1407)
08/01 20:19:07.089: [gmm] INFO: Registration request (../src/amf/gmm-sm.c:135)
08/01 20:19:07.089: [gmm] INFO: [suci-0-001-01-0000-0-0-0000000000]    SUCI (../src/amf/gmm-handler.c:149)
08/01 20:19:07.092: [smf] INFO: Removed Session: UE IMSI:[imsi-001010000000000] DNN:[internet:1] IPv4:[10.45.0.2] IPv6:[] (../src/smf/context.c:1592)
08/01 20:19:07.092: [smf] INFO: [Removed] Number of SMF-Sessions is now 0 (../src/smf/context.c:2979)
08/01 20:19:07.093: [smf] INFO: [Removed] Number of SMF-UEs is now 0 (../src/smf/context.c:951)
08/01 20:19:07.093: [amf] INFO: [imsi-001010000000000:1] Release SM context [204] (../src/amf/amf-sm.c:466)
08/01 20:19:07.093: [amf] INFO: [Removed] Number of AMF-Sessions is now 0 (../src/amf/context.c:2108)
08/01 20:19:07.107: [pcf] WARNING: NF EndPoint updated [127.0.0.5:7777] (../src/pcf/npcf-handler.c:93)
08/01 20:19:07.312: [gmm] INFO: [imsi-001010000000000] Registration complete (../src/amf/gmm-sm.c:1116)
08/01 20:19:07.312: [amf] INFO: [imsi-001010000000000] Configuration update command (../src/amf/nas-path.c:430)
08/01 20:19:07.313: [gmm] INFO:     UTC [2022-08-01T11:19:07] Timezone[0]/DST[0] (../src/amf/gmm-build.c:531)
08/01 20:19:07.314: [gmm] INFO:     LOCAL [2022-08-01T20:19:07] Timezone[32400]/DST[0] (../src/amf/gmm-build.c:536)
08/01 20:19:07.315: [amf] INFO: [Added] Number of AMF-Sessions is now 1 (../src/amf/context.c:2101)
08/01 20:19:07.316: [gmm] INFO: UE SUPI[imsi-001010000000000] DNN[internet] S_NSSAI[SST:1 SD:0x2] (../src/amf/gmm-handler.c:1061)
08/01 20:19:07.318: [smf] INFO: [Added] Number of SMF-UEs is now 1 (../src/smf/context.c:892)
08/01 20:19:07.319: [smf] INFO: [Added] Number of SMF-Sessions is now 1 (../src/smf/context.c:2972)
08/01 20:19:07.320: [app] WARNING: Try to discover [UDM] (../lib/sbi/path.c:114)
08/01 20:19:07.321: [smf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF registered (../src/smf/nnrf-handler.c:294)
08/01 20:19:07.322: [smf] INFO: [3e6877b0-118b-41ed-ac84-61e8ae8d737a] (NF-discover) NF Profile updated (../src/smf/nnrf-handler.c:336)
08/01 20:19:07.325: [app] WARNING: Try to discover [PCF] (../lib/sbi/path.c:114)
08/01 20:19:07.326: [smf] INFO: [3e6e1594-118b-41ed-b12a-b7f7384a6776] (NF-discover) NF registered (../src/smf/nnrf-handler.c:294)
08/01 20:19:07.327: [smf] INFO: [3e6e1594-118b-41ed-b12a-b7f7384a6776] (NF-discover) NF Profile updated (../src/smf/nnrf-handler.c:336)
08/01 20:19:07.330: [smf] INFO: UE SUPI[imsi-001010000000000] DNN[internet] IPv4[10.46.0.2] IPv6[] (../src/smf/npcf-handler.c:497)
08/01 20:19:07.331: [gtp] INFO: gtp_connect() [192.168.0.115]:2152 (../lib/gtp/path.c:60)
08/01 20:19:07.331: [app] WARNING: Try to discover [AMF] (../lib/sbi/path.c:114)
08/01 20:19:07.332: [smf] INFO: [3e6c41ba-118b-41ed-8f0e-9910239c71cb] (NF-discover) NF registered (../src/smf/nnrf-handler.c:294)
08/01 20:19:07.332: [smf] INFO: [3e6c41ba-118b-41ed-8f0e-9910239c71cb] (NF-discover) NF Profile updated (../src/smf/nnrf-handler.c:336)

Open5GS U-Plane2のログは以下の通りです。

08/01 20:19:07.334: [upf] INFO: [Added] Number of UPF-Sessions is now 1 (../src/upf/context.c:178)
08/01 20:19:07.334: [gtp] INFO: gtp_connect() [192.168.0.113]:2152 (../lib/gtp/path.c:60)
08/01 20:19:07.335: [upf] INFO: UE F-SEID[CP:0x1 UP:0x1] APN[internet] PDN-Type[1] IPv4[10.46.0.2] IPv6[] (../src/upf/context.c:397)
08/01 20:19:07.335: [upf] INFO: UE F-SEID[CP:0x1 UP:0x1] APN[internet] PDN-Type[1] IPv4[10.46.0.2] IPv6[] (../src/upf/context.c:397)
08/01 20:19:07.340: [gtp] INFO: gtp_connect() [192.168.0.131]:2152 (../lib/gtp/path.c:60)

TUNnelインターフェースuesimtun0は次のように作成され、IPアドレス10.46.0.2がUEに割り当てられたことが分かります。

# ip addr show
...
8: uesimtun0: <POINTOPOINT,PROMISC,NOTRAILERS,UP,LOWER_UP> mtu 1400 qdisc fq_codel state UNKNOWN group default qlen 500
    link/none 
    inet 10.46.0.2/32 scope global uesimtun0
       valid_lft forever preferred_lft forever
    inet6 fe80::a89a:b57e:3f23:a2c6/64 scope link stable-privacy 
       valid_lft forever preferred_lft forever
...

U-Plane2のDN=10.46.0.0/16を経由してgoogle.comにpingする

tcpdumpを使用して、パケットがU-Plane2のif=ogstunを通過することを確認します。

# ping google.com -I uesimtun0 -n
PING google.com (142.251.42.174) from 10.46.0.2 uesimtun0: 56(84) bytes of data.
64 bytes from 142.251.42.174: icmp_seq=1 ttl=61 time=20.5 ms
64 bytes from 142.251.42.174: icmp_seq=2 ttl=61 time=18.5 ms
64 bytes from 142.251.42.174: icmp_seq=3 ttl=61 time=18.2 ms

U-Plane2のtcpdumpのログは以下の通りです。

20:20:57.409542 IP 10.46.0.2 > 142.251.42.174: ICMP echo request, id 3, seq 1, length 64
20:20:57.426864 IP 142.251.42.174 > 10.46.0.2: ICMP echo reply, id 3, seq 1, length 64
20:20:58.410076 IP 10.46.0.2 > 142.251.42.174: ICMP echo request, id 3, seq 2, length 64
20:20:58.425859 IP 142.251.42.174 > 10.46.0.2: ICMP echo reply, id 3, seq 2, length 64
20:20:59.411688 IP 10.46.0.2 > 142.251.42.174: ICMP echo request, id 3, seq 3, length 64
20:20:59.427283 IP 142.251.42.174 > 10.46.0.2: ICMP echo reply, id 3, seq 3, length 64

注意。パケットがU-Plane1を通過しないことを確認して下さい。UEは、SST:1 & SD:0x000002に基づいて選択したU-Plane2のDNに接続します。

これで、UEに設定したスライス識別子のS-NSSAIに基づいて、UPFを接続するという非常にシンプルな構成を確認できました。ネットワークスライシングを実現する際の設定のヒントになることを期待しています。

最後に

ネットワークスライシングでは、SST(Slice/Service Type)とSD(Slice Differentiator)で構成されるS-NSSAIという識別子を用いて、RANと5GCを跨って論理的なネットワークリソースを割り当てます。この上に、複数のDNを通すことができます。なお、ネットワークスライスを物理的なネットワークリソースに対応付けるところは3GPPでは規定されていません。

最後に、元記事はGithubに書いたものです。Open5GS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

[2022.09.13] 初版。

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Open5GS 5GCとUERANSIM UE/RANでS-NSSAIに基づいてUPFを選択する設定

目次

Open5GS 5GCのシミュレーション携帯網の概要

Open5GS 5GCとUERANSIM UE/RANの設定ファイルの変更点

Open5GS 5GC C-Planeの設定ファイルの変更点

Open5GS 5GC U-Plane1の設定ファイルの変更点

Open5GS 5GC U-Plane2の設定ファイルの変更点

UERANSIM UE/RANの設定ファイルの変更点

RAN(gNodeB)の設定ファイルの変更点

SST:1 & SD:0x000001のUE(IMSI-001010000000000)の設定ファイルの変更点

SST:1 & SD:0x000002のUE(IMSI-001010000000000)の設定ファイルの変更点

Open5GS 5GCとUERANSIM UE/RANのネットワーク設定

Open5GS 5GC C-Planeのネットワーク設定

Open5GS 5GC U-Plane1のネットワーク設定

Open5GS 5GC U-Plane2のネットワーク設定

Open5GSとUERANSIMのビルド

Open5GS 5GCとUERANSIM UE/RANを実行

Open5GS 5GC C-Planeを実行

Open5GS 5GC U-Plane1とU-Plane2を実行

UERANSIM(gNodeB)を実行

UERANSIM(SST:1 & SD:0x000001のUE(IMSI-001010000000000))を実行

SST:1 & SD:0x000001に基づいてU-Plane1に接続したUE(IMSI-001010000000000)を開始

U-Plane1のDN=10.45.0.0/16を経由してgoogle.comにpingする

UERANSIM(SST:1 & SD:0x000002のUE(IMSI-001010000000000))を実行

SST:1 & SD:0x000002に基づいてU-Plane2に接続したUE(IMSI-001010000000000)を開始

U-Plane2のDN=10.46.0.0/16を経由してgoogle.comにpingする

最後に

主な変更履歴