A Proposal of Preferred Parent Change Technique in RPL Network Based on Periodic Link Quality Measurement

Hyungtaek Shin, Yubin Ha, Sanghwa Chung

http://doi.org/10.5626/JOK.2023.50.7.621

IEEE 802.15.4e TSCH is a standard improvement of the MAC layer in IEEE 802.15.4 standard for industrial wireless sensor networks. It constitutes a network with high reliability required for industrial environments and Routing Protocol for Low Power and Lossy Networks (RPL). However, the current RPL evaluates the link quality only for neighbors in communication state, makes an exclusion in link quality evaluation for neighbor nodes whose route is not established, consequently, it causes a side effect of biasing the selection of an already established route. Therefore, in this paper, we introduce a technique that enables link quality evaluation for all neighbor nodes with low overhead using Neighbor Link Quality Estimation (NLQE) packets. The proposed method makes it possible to choose an efficient path selection, and simulation results show that the successful delivery rate of packets increased by more than 15% on average and the latency rate decreased by 20% on average compared to the previous one.