IEEE 802.11ah, marketed as Wi-Fi HaLow, is a new standard for sub-1Ghz communications, aiming to address the major challenges of Internet Things (IoT), namely connectivity among large number densely deployed power-constrained stations. The was only published in May 2017 and hardware supporting HaLow not available on market yet. As such, research 802.11ah has been mostly based mathematical simulation models. Mathematical models generally introduce several simplifications assumptions, which do...

The Restricted Access Window (RAW) mechanism proposed by IEEE 802.11ah promises to address one of the major problems Internet Things (IoT): high channel contention in large-scale densely deployed sensor networks. RAW feature allows Point (AP) divide stations into different groups, with only same group being allowed access simultaneously. Existing station grouping strategies support homogeneous scenarios, where all have fixed data transmission interval, modulation and coding scheme (MCS)...

Minimizing the energy consumption is one of main challenges in internet things (IoT) networks. Recently, IEEE 802.11ah standard has been released as a new low-power Wi-Fi solution. It several features, such restricted access window (RAW) and target wake time (TWT), that promise to improve consumption. Specifically, this article we study how reduce thanks RAW TWT. In order do this, first present an analytical model calculates average during slot. We compare these results simulator have...

IEEE 802.11ah is a new sub-GHz Wi-Fi technology that provides several advantages over traditional such as higher communication range, enhanced scalability, and lower energy consumption, however at the cost of substantially throughput. With aim simultaneously benefiting from multiple technologies, recent proposals suggest combining number these technologies into single device. This, however, compromises efficiency device, it implies concurrent utilization different radio access interfaces. To...

The restricted access window (RAW) feature of IEEE 802.11ah aims to significantly reduce channel contention in ultra-dense and large-scale sensor networks. It divides stations into groups slots, allowing only one RAW slot at a time. Several algorithms have been proposed optimize the parameters (e.g., number group duration, station assignment), as optimal parameter values affect performance depend on network traffic conditions. These often rely accurate estimation future traffic. In this...

IEEE 802.11ah is a new Wi-Fi standard operating on unlicensed sub-GHz frequencies. It aims to provide long-range connectivity Internet of Things (IoT) devices. The restricted access window (RAW) mechanism promises increase throughput and energy efficiency in dense deployments by dividing stations into different RAW groups allowing only one group the channel at time. In this demo, we demonstrate ability support large number densely deployed IoT with heterogeneous traffic requirements....

Minimizing the energy consumption is one of main challenges in Internet Things (IoT) networks. Recently, IEEE 802.11ah standard has been released as a new low-power Wi-Fi solution for IoT. It several features, such Restricted Access Window (RAW) and Target Wake Time (TWT), that promise to improve consumption. In this paper, we present an extension module ns-3 with support TWT feature. We study how affected by coexistence RAW stations (STAs). The results show presence STAs can have extreme...

IEEE 802.11ah is a novel sub-GHz license-free WiFi technology that of great interest for Smart Cities, primarily due to its long range, low energy consumption, reliability, and ubiquitousness. To guarantee lifetime battery-powered Mobile Terminals (MTs), network discovery based on beacon listening or active probing should ideally be avoided. Alternative approaches heavily rely crowd-sourcing, which in turn relies propagation modeling. Due the novelty 802.11ah, accuracy available models...

Multi-Radio Access Technology (RAT) IoT devices are able to combine the high coverage of Low-Power Wide-Area (LPWA) technologies with higher data-rates shorter range such as IEEE 802.11ah. In scenarios, a discovery procedure has be used for detecting availability 802.11ah network. Currently, these procedures consume substantial energy, periodically performed, even if technology is not available, which undesirable low-power Internet Things (IoT) devices. We propose using device's location...

Low-Power Wide-Area Network (LPWAN) multi-Radio Access Technology (RAT) devices combine features of different low-power network technologies to flexibly manage heterogeneous requirements stemming from various Internet Things (IoT) applications. IEEE 802.11ah is a novel technology that envisioned provide "bridge" between Wi-Fi and s, thus it has been often considered as one the supporting in multi-RAT devices. In such multi- RAT scenarios, discovery handover procedures need be utilized for...