Adaptive ATM Routing in Walker Delta Satellite Communication networks

Abstract

Polar and quasi-polar orbit constellations have "seams" between counter-rotated orbits, and ISLs need switch off above the polar regions. Satellite communication networks made up of Walker constellations have steady topology and good ISL performance. Adaptive routing strategy uses path-weight instead of delay or delay jitter as a criterion to select a path under three service models. Numerical results show the change of path weight and weight jitter under uniform model, and delay and delay jitter under discrepant model. Statistical model is a more exact model to describe the distribution of subscribers and the traffic flow from the source to the destination. The optimized path picked by adaptive routing may be longer than the shortest path picked by shortest path routing, but obviously adaptive routing stabilizes the network, and minimizes the network blocking probability and has smaller normalized occupied channels. The two non-GEO systems orbit on different altitude and have different QoS