中文摘要：

根据IEEE802．11标准中的媒体访问控制层协议，利用半马尔可夫过程（SMP），建立基于专用短程通信的车辆间短程无线通信网络（简称DSRC网络）性能可靠性评估模型，并采用不动点迭代算法对模型求解。由此推导出传输延迟和封包投递率这2个网络性能可靠性指标的计算公式。以1个数据包发送的全过程为例，采用推导的公式计算传输延迟和封包投递率，并通过仿真验证计算结果的合理性。结果表明：随着车辆密度的增加，传输延迟基本上没有增加，封包投递率有所减少；计算结果与仿真结果吻合良好。由此说明：DSRC网络性能可靠；采用给出的模型和方法可以更准确和方便地评估DSRC网络的性能可靠性。

英文摘要：

In this paper, we present an analytical method based on the SMP （Semi-Markov Process） model to evaluate the Performability （Performance Reliability） of the dedicated short range communication net- work （DSRC Network） between vehicles due to the MAC layer protocol based on the IEEES02.11 stand- ards, and then applied fixed-point iterative algorithm to calculate the Network Performability. We select the transmission delay, packet delivery ratio （PDR） as the network parameters. We also proposed a simu- lation procedure to verify the accuracy of the analytical model through a large number of simulation experi- ments. The results show that： with the increasing density of the vehicle, transmission delay substantially no increase, packet delivery ratio decrease a bit; the analytical results coincide with the simulation results. Thus： DSRC network performability is in a good shape; the given analytical model and method can be used for the evaluation of the DSRC network performability more accurately and easily.