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Focusing on the increasing market of the sensors and actuators networks, theIEEE 802.11ah Task Group is currently working on the standardization of a newamendment. This new amendment will operate at the sub-1GHz band, ensuretransmission ranges up to 1 Km, data rates above 100 kbps and very low poweroperation. With IEEE 802.11ah, the WLANs will offer a solution for applicationssuch as smart metering, plan automation, eHealth or surveillance. Moreover,thanks to a hierarchical signalling, the IEEE 802.11ah will be able to manage ahigher number of stations (STAs) and improve the 802.11 Power SavingMechanisms. In order to support a high number of STAs, two different signallingmodes are proposed, TIM and Non-TIM Offset. In this paper we present atheoretical model to predict the maximum number of STAs supported by both modesdepending on the traffic load and the data rate used. Moreover, the IEEE802.11ah performance and energy consumption for both signalling modes and fordifferent traffic patterns and data rates is evaluated. Results show that bothmodes achieve similar Packet Delivery Ratio values but the energy consumed withthe TIM Offset is, in average, a 11.7% lower.

Capacity Analysis of IEEE 802.11ah WLANs for M2M Communications