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Scientific Programming
Volume 2016 (2016), Article ID 5796907, 10 pages
Research Article

Infinite Queue Management via Cascade Control for Industrial Routers in Smart Grid IP Networks

1Department of Electrical and Computer Engineering, Pusan National University, Pusan 46241, Republic of Korea
2Department of Information and Communication System, Inje University, Gyeongnam 50834, Republic of Korea
3Department of Information and Communications Engineering, HSV-TRC, Inje University, Gyeongnam 50834, Republic of Korea

Received 28 April 2016; Accepted 17 August 2016

Academic Editor: Kun Hua

Copyright © 2016 Ku-Hwan Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Smart grid applications experience an extremely wide range of communication delay. Data flows of those applications are normally aggregated at industrial network routers in substations, form infinite (long) queues termed bufferbloat issue, and might damage the operation of transmission control protocol. The default queue management scheme, DropTail, in such routers just drops packets if queue is full while the others in literature are mostly based on one-loop feedback control where an optimal point of performance between queue length and drop rate is limited. In this paper, we study the problem of managing a long queue of industrial router at substation under heterogeneous smart grid networks. Specifically, we propose an enqueue-dequeue dropping cascade control using a two-loop design method to control both window size and queue length. Moreover, our proposal can be easily implemented into router firmware with provided discrete expressions. Finally, our simulation results are presented to validate the possible benefits that can be gained from cascade control and compare the existing queue management methods as well.