Every Guaranteed Time Slot (GTS) mechanism in IEEE 802. 15.4 standard can be allocated multiple slots to guarantee the real-time data transmission. For the lack of analyzing multi-slot GTS performances under contention free period, the network calculus, was used to analyze the service curves of delay bound and throughput, and the connection with energy consumption. The IEEE802. 15. 4 sensor node model which has proposed by Jurcik and Koubaa has been improved, and modeling and simulation were done to study how GTS parameters influenced the network performances (delay, throughput and energy consumption). The simulation results indicate that according to high or low burst data rate, there is an optimized allocation of GTS parameters to meet the real-time data transmission.%IEEE802.15.4标准的保障时隙(GTS)机制可分配多个时隙,用于保障实时性数据的传输.针对非竞争接入期多时隙下GTS性能分析的不足,利用网络微积分法分析时延和吞吐量服务曲线及其与能耗的关系,改进IEEE802.15.4传感器节点模型,建模仿真研究GTS参数对网络性能(时延、吞吐量及能耗)的影响.仿真结果表明:根据高低突发性数据率的情况,最优化配置下的GTS可以满足实时性数据的传输.
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