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Signalling aspects                                             3



























                                                 Figure 6-2 – SBAN model


            SBAN  significantly  contributes  to  reducing  operating  expense  (OPEX)  by  1)  elimination  of  both  constant
            maintenance  and  upgrades  to  the  network  equipment;  2)  easy  deployment  of  new  services;  and
            3) improvement of the service provisioning.
            In SBAN, SBAN nodes perform the actions made by the SDN controller. The SDN controller provides SBAN
            capabilities to applications and controls SBAN nodes to meet SDN applications' requirements.
            The southbound interface is the interface between the SBAN nodes and the SDN controller, which carry
            messages from the SBAN nodes to the SDN controller (e.g., the link status message) and messages from the
            SDN controller to the SBAN nodes (e.g., the quality of service (QoS) policy).

            The northbound interface is the interface between the SDN controller and the SDN applications, which carries
            messages from the SDN controller to the SDN application (e.g., the network status message) and messages
            from the SDN application to the SDN controller (e.g., the network service query).


            7       Procedures

            7.1     SBAN node initialization

            First, the access nodes and the aggregate nodes are initialized without the SDN controller. The access nodes
            send  their  information  to  the  aggregate  nodes  through  the  internal  interface,  such  as:  manufacturer
            identification, equipment models, media access control (MAC) address, access ports, internal ports. The
            aggregate nodes collect the information from the access nodes or the other aggregate nodes in the same
            network.

            Then the aggregate nodes negotiate with each other to elect the master aggregate node and the slave
            aggregate  nodes.  The master  aggregate  node communicates on  behalf of  the SBAN  node  with  the  SDN
            controller, as depicted in Figure 7-1.


















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