说明：  概要地介绍了SMAC 协议和仿真平台OMNeT ++ , 并详细介绍了如何使用OMNeT ++ 工具 实现SMAC 协议。最后对SMAC 协议的性能进行了评估。
(Overview of the SMAC protocol and simulation platform OMNeT++, and gave details of how to use the OMNeT++ tool to achieve the SMAC protocol. Finally, the performance of SMAC protocol were evaluated.)