Abstract:

Space flight systems use the IP protocol to carry information, which has  a higher data rate and application flexibility in comparison with traditional wireless communication. In order to solve the problems of lowbandwidth and high error rate, we need an efficient and reliable header compression algorithm to improve payload efficiency. However, due to the complex wireless environment, as well as highspeed maneuverability of space flight systems, the transmission quality of the radio channel changes dynamically, and the protocol cannot be better suited for such a timevarying characteristic. We propose a robust header compression algorithm based on dynamic Bayesian network named DBROHC. According to discrete historical loss packet observation sequence of the decompressor, the algorithm can dynamically adjust key parameters to achieve better balanced compression ratio and robustness. Simulation results show that, compared with the conventional robust compression algorithm, the proposed algorithm is more suitable for complex wireless links.

Key words: header compression, robust, dynamic Bayesian network