  EEE 802.11ah is a novel WiFi-based protocol, aiming to provide an access
solution for the machine-to-machine (M2M) communications. In this paper, we
propose an adaptive access mechanism that can be seamlessly incorporated into
IEEE 802.11ah protocol operation and that supports all potential M2M reporting
regimes, which are periodic, on-demand We show that it is possible to both
efficiently and reliably resolve all reporting stations in the cell, within the
limits of the allowed deadlines. As a side result, we also provide a rationale
for modeling the inter-arrival time in alarm events by using the Beta
distribution, a model that is considered in the 3GPP standardization.
