In the last few years, Telecom operators, Internet Service Providers and public organizations reported statistics of network energy requirements and the related carbon footprint, showing an alarming and growing trend. With this increasing demand for energy in these field related with the increase in carbon dioxide levels in the environment produced by wireless devices in the idle mode, it became necessary to develop to develop the technology that reduce energy consumption. In this context, Wireless Mesh Networks (WMNs) are commonly considered the most suitable architecture because of their versatility that allows flexible configurations. This paper focuses mainly on different studies that propose number of protocols in different types of wireless networks. Several approaches are presented and discussions on the details related to energy management WMN are also presented. The classification of different techniques of the largest existing approaches spent on energy conservation is treated.
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