呼叫阻塞仿真

1 该系统与外界完全独立，无外界基站干扰，假设基站可提供的信道数为10。

2 呼叫的到达时间间隔和每次呼叫的服务时间服从负指数分布，参数分别为1/lamda_arrival和lamda_serve

-Call blocking and outside of the system simulation a fully independent, without outside interference the base station, assuming the base station the number of channels available for the 10.2 calls per call arrival interval and service time is negative exponential distribution, parameter were 1/lamda_arrival and lamda_serve