  Utilizing Low Earth Orbit (LEO) satellite networks equipped with
Inter-Satellite Links (ISL) is envisioned to provide lower delay compared to
traditional optical networks. However, LEO satellites have constrained energy
resources as they rely on solar energy in their operations. Thus requiring
special consideration when designing network topologies that do not only have
low-delay link paths but also low-power consumption. In this paper, we study
different satellite constellation types and network typologies and propose a
novel power-efficient topology. As such, we compare three common satellite
architectures, namely; (i) the theoretical random constellation, the widely
deployed (ii) Walker-Delta, and (iii) Walker-Star constellations. The
comparison is performed based on both the power efficiency and end-to-end
delay. The results show that the proposed algorithm outperforms long-haul ISL
paths in terms of energy efficiency with only a slight hit to delay performance
relative to the conventional ISL topology.
