Joint Node Scheduling and Radio Switching for Energy Efficiency in Multi-radio WLAN Mesh Networks

Wenjia Wu, Junzhou Luo, Ming Yang, Xiaolin Fang
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Abstract

Multi-radio WLAN mesh networks (WMNs) are intended to provide a wireless access infrastructure with high throughput and reliable transmission. With the increasing demand for ubiquitous Internet access, access networks tend to be large-scale, complex and dense, and energy consumption has become a critical concern. Since the networks are designed to support peak traffic demand but does not serve peak traffic demand all the time, which leads to significant energy wastage in off-peak conditions. This means that energy consumption can be effectively reduced through scheduling nodes on/off according to the current traffic demand. In multi-radio WMNs, each node is equipped with multiple radios, and radios can also be switched on/off for further energy saving. Therefore, we investigate the problem of joint node scheduling and radio switching for energy efficiency in this paper, which is proven to be NP-hard. We first formulate the problem as an integer linear programming model, which aims to minimize the power consumption of the network while satisfying node-radio-link, traffic demand and routing constraints. Then, we propose an efficient heuristic algorithm, which iteratively finds routing paths for all mesh access points (MAPs) while satisfying their traffic demand. In each iteration, exact one MAP is selected, and the nodes on its routing path are scheduled on and the corresponding radios are switched on. Finally, extensive simulations are conducted to evaluate the performance of the proposed algorithm in terms of the number of active nodes and radios. The results not only show that the algorithm can achieve energy saving efficiently and effectively, but also demonstrate that the joint optimization of node scheduling and radio switching can obtain better performance on energy efficiency.
联合节点调度和无线交换对多无线WLAN网状网络能效的影响
多无线WLAN网状网络(WMNs)旨在提供高吞吐量和可靠传输的无线接入基础设施。随着互联网接入需求的不断增加,接入网络的规模、复杂性和密集性日益突出,能耗问题成为人们关注的焦点。由于网络的设计是为了支持高峰流量需求,但并不是一直满足高峰流量需求,这在非高峰条件下导致了严重的能源浪费。这意味着可以根据当前的交通需求,通过调度节点的开/关,有效地降低能耗。在多无线电无线网络中,每个节点都配备了多个无线电,无线电也可以打开/关闭,以进一步节省能源。因此,我们研究了联合节点调度和无线交换的能源效率问题,并证明了该问题具有NP-hard。我们首先将问题表述为一个整数线性规划模型,该模型的目标是在满足节点无线链路、流量需求和路由约束的同时最小化网络功耗。然后,我们提出了一种高效的启发式算法,迭代地找到所有网格接入点(map)的路由路径,同时满足它们的流量需求。在每次迭代中,精确地选择一个MAP,并且调度其路由路径上的节点并打开相应的无线电。最后,进行了大量的仿真,以评估所提出的算法在活动节点和无线电数量方面的性能。结果表明,该算法不仅能够高效节能,而且节点调度和无线交换联合优化可以获得更好的能效性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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