Oh Sukho, Hwang DongYeop, Kim Ki-Hyung, Kim Kangseok
Department of Computer Engineering, Graduate School of Ajou University, Suwon 16499, Korea.
Department of Cyber Security, Ajou University, Suwon 16499, Korea.
Sensors (Basel). 2018 Apr 16;18(4):1209. doi: 10.3390/s18041209.
Time Slotted Channel Hopping (TSCH) is widely used in the industrial wireless sensor networks due to its high reliability and energy efficiency. Various timeslot and channel scheduling schemes have been proposed for achieving high reliability and energy efficiency for TSCH networks. Recently proposed autonomous scheduling schemes provide flexible timeslot scheduling based on the routing topology, but do not take into account the network traffic and packet forwarding delays. In this paper, we propose an autonomous scheduling scheme for convergecast in TSCH networks with RPL as a routing protocol, named Escalator. Escalator generates a consecutive timeslot schedule along the packet forwarding path to minimize the packet transmission delay. The schedule is generated autonomously by utilizing only the local routing topology information without any additional signaling with other nodes. The generated schedule is guaranteed to be conflict-free, in that all nodes in the network could transmit packets to the sink in every slotframe cycle. We implement Escalator and evaluate its performance with existing autonomous scheduling schemes through a testbed and simulation. Experimental results show that the proposed Escalator has lower end-to-end delay and higher packet delivery ratio compared to the existing schemes regardless of the network topology.
时隙信道跳频（TSCH）因其高可靠性和能源效率而在工业无线传感器网络中得到广泛应用。为实现TSCH网络的高可靠性和能源效率，人们提出了各种时隙和信道调度方案。最近提出的自主调度方案基于路由拓扑提供灵活的时隙调度，但未考虑网络流量和数据包转发延迟。在本文中，我们提出了一种以RPL作为路由协议的TSCH网络中用于汇聚广播的自主调度方案，名为Escalator。Escalator沿着数据包转发路径生成连续的时隙调度，以最小化数据包传输延迟。该调度仅利用本地路由拓扑信息自主生成，无需与其他节点进行任何额外信令。所生成的调度保证无冲突，即网络中的所有节点在每个时隙帧周期都能将数据包发送到汇聚节点。我们实现了Escalator，并通过试验台和仿真将其性能与现有的自主调度方案进行评估。实验结果表明，无论网络拓扑如何，与现有方案相比，所提出的Escalator具有更低的端到端延迟和更高的数据包交付率。
