Abstract: Energy efficiency is the critical factor in wireless sensor networks.In this paper,we analyze the energy consuming in the physical and MAC layers and present an energy efficiency cross-layer model of the wireless sensor networks.Firstly,the radio power consumption is discussed and an energy estimation model is proposed.Secondly,combined with the RTS-CTS-ACK mechanism of MAC,an energy efficiency analysis model for multi-packets one hop transmission is presented.One numerical example illustrates the validation of the model.

摘要： 在无线传感器网络中,节点的传输能效一直是国内外学者研究的首要问题。从物理层、MAC层协议角度分析了数据传输的能耗问题,给出了在单跳传输的过程中节点所消耗的能量,进而提出了数据传输能效跨层分析模型。分析了无线传感器网络中数据传输的电路机制及能耗,给出了CSMA传输机制的能耗概率模型,结合无线传感器网络中MAC层的RTS-CTS-ACK握手机制,提出了数据分包传输的能效分析模型。通过数值分析,说明提出的数据传输能效分析模型是可行并且有效的。