Abstract
Software-Defined Satellite Networking (SDSN) has emerged as a new paradigm that offers the programmability required to dynamically manage a satellite network. However, the characteristics of SDSN bring several important issues to be solved in the routing scheme. First, interface protocols of the controller incur nonnegligible overhead, which affects the general traffic. Second, more than one controller is required to ensure the reliability of SDSN, which means that they should cooperate with each other to realize the routing function. Third, how to make full use of the advantage of SDSN's centralized management for routing algorithm is worth studying. In this paper, we first propose an SDSN architecture to realize flexible centralized management. Based on this architecture, Intelligent Quality of Service (QoS) Routing scheme is proposed and evaluated. Intelligent QoS Routing (IQR) scheme is composed of overhead balancing strategy, controller cooperation strategy, and IQR algorithm. Overhead balancing strategy effectively reduces the impact of overhead on general traffic, which improves the performance of IQR algorithm. Controller cooperation strategy adopts the ensemble Support Vector Regression (SVR) from artificial intelligence tools to enhance the consistency of different controllers' network views under low frequency situation, which will provide a more accurate reference for IQR algorithm and other management strategies. IQR algorithm takes full advantage of SDSN's centralized control and rich data to offer fine-grained QoS guarantee intelligently. Simulation results show that IQR scheme achieves better overhead balancing performance, more effective controller cooperation, and better QoS guarantee compared with the existing methods.
Highlights
Satellite networks can provide network services anywhere and anytime due to the advantage of global coverage, making it an ideal component for the next-generation Internet
In order to solve these problems in satellite networks, people turn their attention to Software-Defined Networking (SDN)
Overhead balancing strategy effectively reduces the impact of overhead on general traffic, which improves the performance of Intelligent QoS Routing (IQR) algorithm
Summary
Satellite networks can provide network services anywhere and anytime due to the advantage of global coverage, making it an ideal component for the next-generation Internet. We propose a new routing scheme for SDSN in this paper and takes full advantage of SDSN’s centralized control and rich data to offer fine-grained QoS guarantee intelligently. If the frequency is reduced or the controller cooperation information is simplified, the overheads will be reduced, but the global network views in different controllers may be inconsistent This case is called weak consistency, which affects some network applications such as the traffic load balancing [25]. It adopts the ensemble SVR from artificial intelligence tools to enhance the consistency of network views in different controllers while keeping the overheads stay at a relatively low level This means that controller cooperation strategy can provide a more accurate reference for IQR algorithm and other management strategies without affecting the general traffic. With the help of the network view in each controller, IQR algorithm can integrate various factors such as traffic prediction, traffic engineering, rerouting, etc. to provide more detailed services within each controller domain
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