As the continuous in-depth research of sixth generation (6G) technology, the satellite networks in the Space-Air-Ground Integrated Network (SAGIN) have received more and more attention. However, since satellite nodes have the characteristics of limited resources and dynamic link switching, it is important to effectively save energy in satellite networks. In this paper, we focus on how to make Software-Defined Satellite Networks (SDSN) more energy efficient. First, we propose an energy consumption model for satellite networks. Based on this model, we put forward an improved network topology generation algorithm, which can comprehensively consider the link switching energy consumption and the inter-satellite link energy consumption. Then, considering the huge energy consumption caused by abnormal traffic in the satellite network, we propose a DDoS mitigation mechanism in the satellite network, aiming to reduce the extra energy consumption generated by processing abnormal traffic in the satellite node. Finally, through performance evaluation, the proposed network topology generation algorithm and DDoS attack mitigation strategy can effectively reduce network energy consumption.

/pdf/an-energy-efficient-topology-design-and-ddos-attacks-214ca6gd9h.pdf

An Energy-Efficient Topology Design and DDoS Attacks Mitigation for Green Software-Defined Satellite Network

With the popularity of smart home services, smart home devices are also increasing significantly. At the same time, security problems of smart home services are becoming more and more important. With the characteristics of non-tampering and multi-party consensus mechanism, Blockchain technology provides powerful capabilities in security protection. In this paper, we introduce the widely used permission Blockchain Fabric for smart home services. As the high requirements of performance, we firstly study the methods of performance optimization for Fabric. Then, a Fabric-based smart home security control system is designed. Based on this system, the smart home system is able to provide access control and security control for smart home devices. The experimental results show that the system works best when the number of concurrent registrations of smart home device is under 6000.

/pdf/research-on-performance-optimization-and-application-in-1oa30i1g.pdf

Research on Performance Optimization and Application in Smart Home for Hyperledger Fabric

In order to address a problem in the research related to the low stability and communication efficiency issues in the generation of optical communication constellation network topology, there is a critical component for sensing the interaction among satellites. This paper makes a novel contribution by proposing a multi-constraint optimization algorithm for optical communication constellation network topology generation. The proposed method significantly improves the existing systems by considering multiple attributes that influence the establishment of inter-satellite links and reducing the impact of subjective factors. This unique approach involves calculating the entropy weight of each attribute using the information entropy method based on the degree of change in each indicator. Subsequently, the weights of the indicators are corrected to obtain the objective weight of each attribute. The comprehensive weight of the link, computed based on the initial link attribute values and weights, serves as the decision basis for link selection, thereby forming the satellite network topology. Upon evaluation, the proposed method has shown remarkable superiority over the compared schemes in terms of communication efficiency and stability. 

An Enhanced Multi-Constraint Optimization Algorithm for Efficient Network Topology Generation

The high-speed movement of satellites makes it not feasible to directly apply the mature routing scheme on the ground to the satellite network. DT-DVTR in the snapshot-based connection-oriented routing strategy is one of the representative solutions, but it still has room for improvement in terms of routing stability. In this paper, we propose an improved scheme for connection-oriented routing strategy named the Minimal Topology Change Routing based on Collaborative Rules (MTCR-CR). The MTCR-CR uses continuous time static topology snapshots based on satellite status to search for intersatellite link(ISL) construction solutions that meet the minimum number of topology changes to avoid route oscillations. The simulation results in Beidou-3 show that compared with DT-DVTR, MTCR-CR reduces the number of routing changes by about 92%, the number of path changes caused by routing changes is about 38%, and the rerouting time is reduced by approximately 47%. At the same time, in order to show our algorithm more comprehensively, the same experimental index test was also carried out on the Globalstar satellite constellation.

MTCR-CR routing strategy for connection-oriented routing over satellite networks

The suggested method in this study is Next Immediate Right Minimum Cost. Calculating the Minimum Designation and minimizing the toll in order to determine the most feasible solution that minimizes the deviation from the basic achievable solution for the Transportation Network Problem, minimum right-side designations are linked. The suggested computation could offer a unique method for reaching the optimal, practical, and vital layout to some extent without disturbing influence of decadence condition and inferred the direct fetched organize to get the linear path for the comparing organize, to infer the Reduced for Balanced and Unbalanced Problem.

Linear Graphical Optimized Cost Analysis for Balanced and Unbalanced Network Topology- Min- Min Right Algorithm and Min-Min Next Immediate Right Algorithm Approach

DCTG : Degree Constrained Topology Generation Algorithm for Software-defined Satellite Network.

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DCTG : Degree Constrained Topology Generation Algorithm for Software-defined Satellite Network.