IEEE802.15.4标准的GTS时延分析

摘要

为准确评估IEEE802.15.4网络中GTS实时传输性能，保证实时传输，简单介绍了IEEE 802.15.4协议的GTS调度机制，建立了GTS调度机制的数学模型和仿真模型，分析了不同网络环境下超帧参数SO对GTS调度机制的时延的影响。结果表明，数据到达率、最大突发值较低时，其超帧指数越低，系统相应的时延界限就越小；最大突发值较大时，系统的时延界限在超帧参数SO=2时取得最小值，能更好地保证实时传输。%To accurately evaluate GTS real time transmission performance, guarantee real time transmission, the paper brielfy introduced the GTS mechanism in IEEE 802.15.4 protocol, built the mathematical model and the simulation model of GTS mechanism, and analyzed the impact of Superframe Order on the GTS delay bound under different network conditions. Results showed that with low arrival rates and low burst size, low superframe order was suitable for providing low delay bounds. However, if the burst size is relatively high, superframe order SO=2 is better for providing timeliness guarantees.