详细阐述了设计通信网络仿真环境里的各个参数，如带宽，延迟，掉包率，等等因素，这里的网络包括了WLAN，3G以及各种业务所需的基本条件-Detail the design of communication network simulation environment, all parameters such as bandwidth, delay, substitution rate, among other factors, where the network includes a WLAN, 3G, and the basic conditions required for various services