+------------------------------------------+
| Customer higher-level operation system   |
|  (e.g., E2E network slice orchestrator,  |
|     customer network management system)  |
+------------------------------------------+
                     A
                     | IETF Network Slice Service Interface
                     V
+------------------------------------------+
|    IETF Network Slice Controller (NSC)   |
+------------------------------------------+
                     A
                     | Network Configuration Interface
                     V
+------------------------------------------+
|           Network Controllers            |
+------------------------------------------+