Future network applications, Network Model, and development strategy

This paper focuses on important issues pertinent to future networks, i.e. future network application trend, Network Model, and NGN development strategies. The authors challenge the orthodox OSI/RM and Internet architectural representation with a point of view that it does not explain modern network operation satisfactorily and is unable to cope with service oriented trend in network computing. By re-clarifying out-of-band signaling concept in the context of networking, this paper provides an architecture representation of Internet and introduces an ONAS/RM (Open Network Application Service/Reference Model) for future networks. With regard to NGN development strategy, this paper promotes a “BSF-OES” (Backbone Substrate First, Outwards Expansion Second) strategy, in contrast to “add-on” approaches widely adopted in standards organizations and to those termed by layer-less architecture. Finally, a framework of SUPANET (Single-layer User-data switching Platform Architecture Network), developed at SC-Netcom Lab, is used to demonstrate feasibility of such strategy and how to cope with technical challenges, to protect investments, and to make smooth migration to future networks.