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中文摘要：
针对基于IEEE802．15．4协议CSMA／CA机制的实时监测系统，为了分析CSMA／CA参数设置对网络性能的影响，建立了一个引入优先级信号处理的马尔可夫链数学模型．分析和比较了分别设置优先级信号和普通信号的协议参数，对优先级信号实时性和整体网络性能的影响。结果表明．综合考虑网络规模和网络中信号产生情况，合理地分别设置两种信号的CSMA／CA协议参数，可以提高优先级信号的实时性．而对普通信号的影响较小。
英文摘要：
The performance of the slotted CSMA/CA mechanism of IEEE 802.15.4 in WSNs was analyzed. In order to analyse the impact of the CSMA/CA parmeters on the network performance, an accurate Markov chain model was presented to analyse the protocol parameters of supersiority signal and common signal and to compare two signals with each other about their impacts on the time-reality of superiority signal and the performance of the whole network. The results show that considering the scale of network and the network signal, and setting a reasonable CSMA / CA parameters can be very good to improve network performance.
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