# Dynamic Routings in Satellite Networks: An Overview
## 2 Related Works
\begin{table}
\begin{tabular}{p{122.3 pt} p{122.3 pt} p{122.3 pt} p{122.3 pt}} \hline \hline
**Routing** & **Architecture** & **Description** & **Characteristics** \\ \hline LZDR & & Connection-oriented routing algorithm based on virtual nodes & Dividing routing based on neighboring virtual nodes. Reduce communication overhead by overlay routing. \\ \hline DRA & & Typical virtual node routing algorithm & Routing is performed by logical position. Source satellites have rerouting capabilities \\ \hline LCPR & Single-Layer & An advanced DRA routing algorithm & Optimal paths are obtained utilizing distributed computing methods \\ \hline FHRP & & Connection-oriented routing algorithm & Effectively simplifies routing and minimizes routing overhead \\ \hline LRES & & Load-balanced routing algorithm & Dynamically adjusts routes based on link status Effectively prevents network congestion \\ \hline SGGM & & Group-managed routing algorithm & Forwarding of packets and calculation of routing tables is independent of mutually. \\ \hline DDRA & & Data-driven routing algorithm & Provides optimal routing Better network adaptation. \\ \hline SGRP & Multi-layer & Satellite grouping and routing protocol & Provides a mechanism to resolve congestion and satellite failures. \\ \hline HSRP & & Hierarchical satellite routing protocol & Improves network resource utilization. \\ \hline ERRS & & Expanding Range Route Selection & Reduces end-to-end latency and increase network throughput. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Comparison of the partial algorithms. The space-air-ground-sea integrated network (SAGSIN) combines satellite, ground, air, and maritime networks for 6G communication. With its diverse network composition, open communication environment, and time-varying network topology, the SAGSIN encounters severe threats to its security. However, the safety issues of the SAGSIN are not thoroughly studied by domestic and foreign scholars. Therefore, the work in [14] presented a unified summary of the research work related to SAGSIN security. First, the article investigated the current status of SAGSIN and the network architecture system, as well as its characteristics and technical difficulties. Next, the security requirements of the SAGSIN system were discussed, focusing on various types of representative networks. Then, the authors provided a detailed description of the security threats, attack methods, and defense strategies of SAGSIN systems. Moreover, the security problems, attacks, and defense methods of SAGSINs were highlighted, including multi-layered and diverse network structures. This paper explores security precautions such as anti-interference techniques, secure routing algorithms, secure switching mechanisms, key management mechanisms, and IDSs to address interference, eavesdropping, denial of service, and fraud attacks in SAGSIN systems. Finally, the article outlined cross-level attacks and security precautions in the SAGSIN system, pointing out possible new challenges and future trends in research. As digital connectivity grows globally, major network components must be rebuilt and reassessed. Based on the giant LEO constellation, the work in [15] introduced the application of the ground network in the next-generation wireless communication network. While the strengths of the LEO satellite network can compensate for terrestrial network weaknesses, combining the two can significantly impact network design and deployment. Then, the paper presented a systematic study of the future development of large LEO satellites and summarized the constellation network's favorable conditions and major problems. Additionally, a comprehensive review of the large LEO satellite network was conducted to realize its performance simulation better. Simulation software can accurately characterize the satellite network's operation. Special network details require extensive iterative operations in the simulation algorithm. The simulation system is unique because its special structure cannot be extended to other networks.