说明：  第一次上传，上传电子书“无线传感器网络协议和结构”，无线传感器网络国外经典教材之一。可以帮助该方面的研究人员分析研究WSN的架构和协议内容
(it is the first for me to upload. I upload digital book "protocol and architecture of wireless sensor network", which is a classical textbook in WSN field. Furthermore, it can help researcher to analysis and research on the architecture of WSN)