Survey on Routing Technology of Mega Constellation

With the continuous expansion of satellite constellation, this paper analyzed the characteristics of mega constellation, and summarized the capability requirements of routing algorithms for mega constellation from two aspects of networking transmission and service requirements, included reducing signaling overhead, load balancing, fault recovery, and guaranteeing QoS.In addition, it introduced the routing methods, algorithms, and their performances that were applicable to mega constellation.It looked forward to the future related technology directions for mega constellation, included software defined network, area division management, artificial intelligence, and computing power routing, with the aim of providing reference for the construction of 6G satellite Internet.