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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.
CEP Rule Distribution Algorithm for In-network Processing in an IoT Network Environment
http://doi.org/10.5626/JOK.2018.45.7.722
As the number of IoT devices increases, data coming from devices are also increasing exponentially. The data generated from devices are stored and managed through a system structure using the database. However, to manage the surging data, the existing database is limited in terms of maintenance costs and in real time. Too overcome these limitations, Complex Event Processing (CEP), which processes data as much as possible within the network, has emerged, and data processing is being carried out using this strategy. In this paper, we propose a CEP Rule distribution algorithm which can reduce server burden and guarantee network performance through distribution of the CEP Rule in an IoT environment. To prove this, we perform a small experiment using open source, such as the OpenWSN and TelosB node, and verify the mitigation of server load and the performance of data processing according to the algorithm.
An SDN-based Bandwidth Control Scheme considering Traffic Variation in the Virtualized WLAN Environment
A virtual network technology can provide a network reflecting the requirements of various services. The virtual network can distribute resources of the physical network to each virtual slice. An efficient resource distribution technique is needed to reflect the requirements of various services. Existing bandwidth distribution techniques can only control downlink traffic without taking traffic conditions on the network into account. Downlink and uplink share the same resources in a wireless network. The existing bandwidth distribution techniques assumed that all stations generate saturated traffic. Therefore, the existing bandwidth distribution technique cannot make traffic isolation in a virtual wireless network. In this paper, we proposed a traffic-based bandwidth control techniques to solve these problems. We applied Software-Defined Networking(SDN) to the virtual wireless network, monitored the traffic at each station, and searched for stations that generated unsaturated traffic. We also controlled both uplink and downlink traffics dynamically based on monitoring information. Our system can be implemented with legasy 802.11 clients and SDN-enabled APs. After the actual test bed configuration, it was compared to existing techniques. As a result, the distribution performance of the proposed technique was improved by 14% in maximum.
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