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简单介绍了IEEE802.15.4标准中特有的GTS算法。基于OPNET仿真平台,设计了不同网络环境下的仿真实验。研究了超帧参数SO、数据到达率和IFS参数对GTS吞吐量、耗费带宽以及分组介质接入时延的影响。结果表明,对于高数据到达率时,低SO值和SIFS时,实现了GTS分配的最大化利用以及最小介质接入时延;高SO值和LIFS时,既没有保障GTS分配的最大化利用,反而还加大了分组介质接入时延,不适合时间敏感性强的无线传感器网络。
Briefly introduced the IEEE802.15.4 standard unique GTS algorithm. Based on OPNET simulation platform, the simulation experiments under different network environments are designed. The effects of super frame parameters SO, data arrival rate and IFS parameters on GTS throughput, bandwidth consumption and packet media access delay are studied. The results show that the maximized utilization of GTS allocation and minimum media access delay are achieved for high data arrival rate, low SO value and SIFS. In the case of high SO and LIFS, the maximum utilization of GTS allocation is not guaranteed, But also increased the packet media access delay, not suitable for time-sensitive wireless sensor networks.