Abstract: QoS routing for LEO(Low Earth Orbit) satellite network faces great challenges due to several issues, such as, ingress satellite handover, unbalanced distribution of traffic and the limited on-board processing ability. A light-weight on-demand QoS source routing algorithm using mobile agent was proposed. Firstly,ISL(inter-satellite link) availability index was designed considering ISL utility. Secondly, satellite availability index was put forward based on traffic distribution undertaken by satellite network. hhirdly, the migration strategy of mobile agent was given taking both indexes into account. Consequcntly,ISI. routing and rerouting were presented in detail. Simulation results demonstrate that the proposed approach has lower signaling overhead, better delay fitter, new call blocking probability and handover blocking probability than the traditional methods.

Key words: LEO satellite network, Mobile agent , QoS, Routing algorithm