Satellite networks have traditionally been considered for specific purposes. Recently, new satellite technologies have been pushed to the market enabling highperformance satellite access networks. On the other hand, network architectures are taking advantages from emerging technologies such as Software-Defined Networking (SDN), network virtualization and Network Functions Virtualization (NFV). Therefore, benefiting communications services over satellite networks from these new technologies at first, and their seamless integration with terrestrial networks at second, are of great interest and importance. In this paper, and through comprehensive use cases, the advantages of introducing network programmability and virtualization using SDN and/or NFV in satellite networks are investigated. The requirements to be fulfilled in each use case are also discussed.
In moving toward an interoperability architecture, the concept of network centric is a step in the right direction-all modules connect to the network, not to each other. And a handful of good network citizenship rules provide a syntactical guide for attachment. From the point of view of the network designer this is sufficient-we have enough to build internetworks for the common good. The continued burgeoning of the Internet constitutes an existence proof. But a common networking base is insufficient to reach a goal of cross-system interoperability-the large information system. Many standardization efforts have attempted to solve this problem, but appear to have lacked the necessary scope. For instance, there have been many efforts aimed at standardizing data elements; these efforts, if followed through, yield some gains, but never seem to quite reach the interoperability goal. If we are to truly erect an interoperability architecture, we need to broaden the scope. This problem of cross-program, cross-service and cross-ally interoperability requires that we agree on the what of modularization, not just the how. This paper is aimed at framing the interoperability architecture problem. On modularization The core of architecture-the way things fit together-is a sense of modularization. This is the part of the problem that is perhaps the least mechanical and requires judgment. Experience, no doubt, helps. Architectural conformity must be traded off against other desired characteristics. The objective is that modules become inherently interoperable so we have components delivered by multiple programs that can be assembled for particular tasks. Prerequisite-network centric.
Abstract-This paper presents an Adaptive Greedy-Compass Energy-aware Multipath (AGEM), a novel routing protocol for wireless multimedia sensors networks (WMSNs). AGEM uses sensors nodes position to make packet forwarding decisions. These decisions are made online, at each forwarding node in such a way that there is no need for global network topology knowledge and maintenance. AGEM routing protocol performs load-balancing to minimize energy consumption among nodes using twofold policy: (1) smart greedy forwarding based on adaptive compass and (2) walking back forwarding to avoid holes. Performances evaluations of AGEM compared to GPSR (Greedy Perimeter Stateless Routing) show that it can maximize the network lifetime, guarantee quality of service for video stream transmission, and scale better on densely deployed wireless sensors network.
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