Energy Efficiency in Large Scale Interference Limited wireless ad hoc networks

This paper presents an analytical approach to quantify energy efficiency (EE), i.e., the bits per Joule performance of a large scale interference limited random wireless ad hoc network. Energy consumption is investigated at physical, medium access control (MAC) and routing layers. Communication between a user and its destination is facilitated by multihop relaying and Slotted ALOHA based MAC protocol. Energy consumption of user´s communication hardware platform is analyzed considering the transceiver architecture. Geometry of the forwarding areas resulting from two different long hop routing protocols is explicitly considered in the analysis. The link model is formulated to cater for user´s desired QoS while considering the network interference and the spatial/channel uncertainties. EE performance of the network is quantified from single-hop forward progress, node isolation and hop statistics. Optimal MAP which maximizes the network EE is also investigated. Analytical results are supported by Monte Carlo simulations. It is shown that several hypothesis established in existing literature which ignores network interference and fading do not hold in large scale interference limited ad hoc network.