Links assignment scheme based on potential edges importance in dual-layer wavelength routing optical satellite networks

Abstract

With the development of the massive satellite constellation and the on-orbit laser-based communication equipment, wavelength routing optical satellite networks (WROSN) becomes a potential solution for on-orbit, high-capacity, and high-speed communication. Since the inter-satellite links (ISLs) are time-varying, one of the fundamental considerations in the construction of the WROSN is assigning limited laser communication terminals for each satellite to establish ISLs with the visible satellites. Therefore, we propose a links assignment scheme (LAS) based on the potential edges importance matrix (PEIM) algorithm to construct a temporarily stable topology for a dual-layer WROSN (DWROSN). The simulation results showed that the LAS based on the PEIM algorithm diminishes the long-hops route path, reduces the average node-to-node distance, and saves the wavelength demand of the DWROSN. The node pair connectivity and wavelength demand in the DWROSN is a trade-off problem. The research in this paper also brings a novel method for optimizing the route paths and reducing the wavelength demand of wavelength routing optical satellite networks, that is through designing the topology with a links assignment algorithm.