Specifically, different from the previous work, the proposed scheme does not need to estimate the number of active stations for each priority class but still achieves the channel utilization close to its optimal value by exploiting a new parameter, persistent factor, whose optimal value can dynamically follow the change of the load based on a simple estimation of the network status.

In this paper, the principle of optical pumping is analysed theoretically, the means to oftain and measure optical pumping signal are introduced, some of its applications suoh as the measurements of the Lande factor and the geomagnetic field are discussed.