In the present work, we have proposed an analytical Markov-chain model of the modified slotted Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) IEEE 802.15.4 Medium Access Control (MAC) protocol, which efficiently utilizes the Guaranteed Time Slots (GTSs) under saturated traffic conditions. The five dimensional Markov chain model based analysis is performed for variable Contention Access Period (CAP). Two constraints are introduced i.e. Global Utilization Factor (GUF) and Local Utilization Factor (LUF), to adjust the duration of CAP in each cycle. The work mainly focuses on utilization of GTS under saturated traffic condition for high traffic load applications. To evaluate the performance of our proposed model, we have compared the performance with Misic’s model of standard IEEE 802.15.4 MAC protocol. In addition, the analysis is carried out for practical networks where the data traffic is bursty in nature. The results reflect that our proposed algorithm improves the throughput of the IEEE 802.15.4 MAC protocol in energy-efficient manner at high traffic load applications.

在目前的工作中，我们提出了一种改进的带槽载波侦听多路访问/冲突避免（CSMA / CA）IEEE 802.15.4媒体访问控制（MAC）协议的解析马尔可夫链模型，该协议有效地利用了保证的时隙（ GTS）。针对可变竞争访问周期（CAP）进行了基于五维马尔可夫链模型的分析。引入了两个约束，即全局利用率（GUF）和局部利用率（LUF），用于调整每个周期中CAP的持续时间。这项工作主要集中在高流量负载应用程序在饱和流量条件下利用GTS。为了评估我们提出的模型的性能，我们将性能与Misic的标准IEEE 802.15.4 MAC协议模型进行了比较。此外，分析是针对实际网络中数据流量本质上是突发性的。结果表明，我们提出的算法在高流量负载应用中以节能的方式提高了IEEE 802.15.4 MAC协议的吞吐量。