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Signalling aspects                                             3


                                                      Appendix I


                                                 An example of SBAN
                            (This appendix does not form an integral part of this Recommendation.)


            IP  RAN  is  based  on  IP/multi-protocol  label  switching  (MPLS)  technology  framework,  through  enhanced
            operation,  administration  and  maintenance  (OAM),  protection,  clock,  network  management  and  other
            capabilities, to meet the needs of wireless, access and other integrated services.
            Compared with other IP network, IP RAN has the following characteristics:
            1)      IP RAN has only two kinds of topology: ring or chain structure. In most cases, it will be ring structure
                    due to network robustness;
            2)      An access node only belongs to a ring or a chain;
            3)      One endpoint of the flow in the IP RAN is an access port, the other side is an aggregate port or an
                    access port in the same ring or the same chain;
            4)      Based on the ring structure, the work and backup path of each flow have only two options: clockwise
                    or counter clockwise.
            Each  ring  or  chain  can  be  abstracted  into  a  simple  virtual  switch  which  composed  of  access  ports  and
            aggregate ports, without considering the specific path.
            In software-defined IP RAN, each ring or chain can be abstracted into a virtual SDN switch composed of access
            ports and aggregate ports, which is called SBAN node and depicted in Figure I.1.




















































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