Addressing Subnet Division Based on Geographical Information for Satellite-Ground Integrated Network

To tackle the address aggregation problem for the low earth orbit (LEO) satellite communication system, a global geographical Internet Protocol subnet division model for space–ground integrated network addressing scheme is proposed in this paper. A 2-D spherical coordinate system based on spherical distance is applied to describe the LEO satellite track and the location information of geographical subnet zone. A mathematical framework for abnormal addressing users is constructed under the system. The size and division of geographical zone influence the expectation of abnormal user number through the ratio of logically covered and fully covered time. When the terrestrial regions are divided into small cells, the number of abnormal users reduces, as well as the partial routing cost. The simulation results confirm that the ratio of logically covered and fully covered time increase and the number of abnormal users decreases when the size of ground cells declines. The origin regions could be divided into smaller ground cells in order to reduce abnormal addressing users, balancing the cost on partial routing mechanism, mobility management, and satellite routing table items. This paper presented a solution and direction of addressing scheme and mobility management design for the space-terrestrial hybrid network.