An Efficient Message Queue Designation Scheme for Space-Ground Communication

Abstract

The complex cosmic environment imposes communication challenges on space-ground cooperation, including high message delay, unstable communication link, and high bit error rate of spacecraft. It is of great importance to improve the communication quality between the mission center and the spacecraft, in particular with the control of remote space manipulator. In this paper, we design a set of message queue communication modules based on a mixture framework of TCP protocol and UDP protocol to improve the safety and efficiency of space-ground communication. By categorizing and re-ordering the common message commands, and sorting out the order importance, the topological sorting algorithm is used to optimize the transmission order of messages. In addition, the command sending mode is determined by the degree of network congestion. The simulation experiment shows that the proposed message queue design improves the general transmission safety. In particular, the transmission efficiency of emergency commands increased by about 30% in the case of insufficient network resources. This message queue designation scheme has potentials to be used in assisting space-ground cooperation.