In several use-cases of Internet of Things (IoT), IEEE 802.11 based WLANs are more favorable due to superior data rate support even though their energy efficiency is not up to the mark. Particularly, wireless multimedia sensors based WLANs demand higher energy resources. In this regard, various IEEE 802.11 based power saving mechanisms are developed. IEEE 802.11n standard specifies Power Save Multiple Poll (PSMP) protocol. However, PSMP is infeasible for many IoT based systems specifically in use-cases where multi-hop communication is required. Moreover, PSMP scheduling mechanism lacks the capability to adapt to the dynamic Quality of Service (QoS) requirements in Internet of Multimedia Things (IoMT). In this paper, a QoS aware Multi-Hop PSMP (mPSMP) protocol is proposed to enable energy efficient multimedia communication over IoT. The mPSMP incorporate a traffic scheduling model to allocate channel resources in a time division multiple access manner. Therein, adaptive duty cycling is employed to minimize energy utilization, while assuring the required multimedia QoS for each node. The proposed protocol is implemented in Network Simulator-2 (NS-2). Analytical analysis and simulation study suggests reduction in end-to-end delay and duty cycling along with significant improvement in energy efficiency of IoMT devices.
['Bilal Afzal', 'Sheeraz A. Alvi', 'Ghalib A. Shah']
Adaptive duty cycling based multi-hop PSMP for internet of multimedia things