Power-saving mode parameter optimization

We have studied the impact of the length of the BP on the energy and delay performance of PSM stations for our generic wireless system. We have shown that there exists an optimal length of the BP that achieves minimum total energy consumption, and that it depends on the number of STAs and the offered load through a very simple relationship. We have also derived the relationship between the length of the BP and the average packet delay and have validated it by simulation. We have proposed an adaptive scheme based on the formulae we have derived from the analysis, and our results confirm that an adaptive PSM can further improve the performance of the system.