基于IEEE802.15.4的GTS调度算法优化

摘要

针对实时无线传感器网络(WSNs)系统对时延敏感的特点,对目前典型的IEEE802.15.4标准中保障时隙(GTS)调度算法进行了改进,提出一种基于时延优先级的GTS分配算法.根据网络微积分原理评估时延约束条件及GTS分配数目,按照优先级顺序响应GTS请求,并动态调整GTS中的时隙数量,确保实时传输和带宽利用率.通过在OPNET平台上对该算法进行仿真实验,结果表明改进后的算法降低了时延,提高了传输效率.%For latency-sensitive characteristic of the real-time WSNs (wireless sensor networks) system, the typical GTS (guaranteed time slot) scheduling algorithm based on IEEE802.15.4 standard is improved and a new GTS allocation algorithm based on latency priority is proposed. In order to ensure real-time transaction and bandwidth utilization, the novel algorithm evaluates latency constraint condition and the number of allocated GTS which is based on network calculus theory, responds to GTS request orderly by priority and adjusts the number of time slots in the GTS dynamically. According to the simulation on OPNET platform, the results of experiments show the proposed mechanism could provide less delay and better transmission efficiency than the standard allocation method.