Energy-efficient activation of nodes and radios in multi-radio WLAN mesh networks
Ming Yang, Junzhou Luo, Wenjia Wu, Xiaolin Fang · International Journal of Sensor Networks · 2016
In multi-radio WLAN mesh networks (WMNs), it is an effective way to achieve energy saving through on-demand activation of network nodes and radios, that is, scheduling nodes on/off and switching radios on/off according to the current traffic demand. In this paper, we study the problem of joint node scheduling and radio switching for energy efficiency, which aims to minimise the power consumption of the network. We first present a mathematical model based on integer linear programming (ILP). Then, we propose an efficient heuristic algorithm, which iteratively finds routing paths for all mesh access points (MAPs) and activates as few nodes and radios as possible, while satisfying their traffic demand. Moreover, we also consider the dynamics of the traffic demand, and propose a fast update algorithm to adjust the activation of partial nodes and radios. Finally, extensive simulations are conducted to assess the effectiveness and efficiency of our proposed algorithms.