  We provide an overview of the key aspects of low Earth orbit (LEO) satellite
communication networks towards 6G. Offering space-based Internet services with
mega-constellations of LEO satellites is a promising solution to connecting the
unserved and underserved, thereby complementing the coverage of terrestrial
networks and contributing to bridging the digital divide. Integrating LEO
satellite access in cellular systems will be one of the connectivity's new
frontiers on the path to 6G. There are however challenges from operational and
technical obstacles to regulatory hurdles facing the development of LEO based
communication networks. In this article, we review the evolution of LEO
satellite constellations and capabilities, analyze the technical challenges and
solutions of LEO satellite access networks, discuss the standardization aspects
from 5G evolution to 6G, and investigate the use cases and business
considerations towards 6G.
