Kim Min-Jae, Chung Sang-Hwa
Department of Information Convergence Engineering, Pusan National University, Busan 46241, Korea.
Sensors (Basel). 2021 Apr 28;21(9):3074. doi: 10.3390/s21093074.
The combination of time slotted access and channel hopping technology in IEEE 802.15 TSCH networks enables high reliability and low power operation to meet the stability and real-time requirements of industrial applications. Basically, TSCH and RPL, a routing protocol for TSCH, are proposed for static nodes that generate fewer control messages, so they allow collisions in shared cells when they exchange control messages. In a topology containing mobile nodes, the collision of control messages in a shared cell makes the network difficult to recover quickly. The proposed scheme minimizes the collision of control messages by allocating dedicated control cells to form preferred parent nodes quickly for mobile nodes. We also proposed a method for establishing a fixed route from the root node to the mobile node in RPL to minimize the delay time. Through the simulation using the 6TiSCH simulator, it was confirmed that the performance of the proposed method was approximately 2.5 times better in terms of overhead and resource use, and 33% better in terms of network participation time of mobile nodes compared with existing solutions.
IEEE 802.15 TSCH网络中的时隙接入和信道跳变技术相结合，可实现高可靠性和低功耗运行，以满足工业应用的稳定性和实时性要求。基本上，TSCH和RPL（一种用于TSCH的路由协议）是针对生成较少控制消息的静态节点提出的，因此它们在交换控制消息时允许在共享单元中发生冲突。在包含移动节点的拓扑中，共享单元中控制消息的冲突使网络难以快速恢复。所提出的方案通过分配专用控制单元来快速为移动节点形成首选父节点，从而最大限度地减少控制消息的冲突。我们还提出了一种在RPL中从根节点到移动节点建立固定路由的方法，以最小化延迟时间。通过使用6TiSCH模拟器进行的仿真，证实了与现有解决方案相比，所提出方法在开销和资源使用方面的性能大约提高了2.5倍，在移动节点的网络参与时间方面提高了33%。
