突发流量自适应的6TiSCH网络分布式PID调度

Distributed PID scheduling in 6TiSCH network with burst traffic adaptation

工业物联网络6TiSCH通过对时隙跳频模式和IPv6协议的引入,在支持海量节点接入、确定性可靠传输以及低功耗运行方面优势明显。虽然6TiSCH操作子层的定义为用户自定义调度策略提供了规范化的调度执行过程,但在实际应用中仍面临不同应用场景的上层调度函数(即决策实体)个性化设计的问题。本文将控制理论引入确定性工业无线网络的资源调度应用中,将分布式节点间通信资源调控抽象为闭环控制问题,结合经典比例积分微分(proportional-integral-derivative,PID)控制算法,阐述基于PID控制理念的6TiSCH网络资源调度原理,设计面向突发流量场景的6TiSCH网络分布式PID调度算法,构建突发流量友好的上层调度函数。基于OpenMote-B的6TiSCH网络平台实验表明,所提方法支持流量需求动态变化的节点间通信资源的自适应调度,尤其对多种类型突发流量可以快速响应。

By introducing the time slotted channel hopping mode and IPv6 protocol,the industrial Internet of Things 6TiSCH exhibits significant advantages in supporting massive node connectivity,deterministic and reliable transmission,and low-power operation.While the defined 6TiSCH operation sublayer provides a standardized scheduling execution process for user-defined scheduling strategies,it still faces the challenge of personalized design for upper-layer scheduling functions(i.e.,decision entities)in different application scenarios.In this paper,the control theory is introduced into the scheduling application of the deterministic industrial wireless network,the communication resource control between distributed nodes is generalized as a closed-loop control problem,the principles of resource scheduling in 6TiSCH network are elucidated by combing the classic PID control concept.A distributed PID scheduling algorithm for 6TiSCH network,which is specifically tailored for burst traffic scenarios,is designed,and an upper-layer scheduling function that is friendly to burst traffic is constructed.The experiments conducted on an OpenMote-B based 6TiSCH network platform demonstrate that the proposed method enables adaptive scheduling of communication resources between nodes with dynamically changing traffic demands,and presents rapid responses especially for various types of burst traffic.