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Mobile Information Systems
Volume 2017, Article ID 6979178, 12 pages
Research Article

Multitiered and Distributed WSAN for Cooperative Indoors Environment Management

1Electronics and Telecommunications Research Institute, Daejeon, Republic of Korea
2Ajou University, Suwon, Republic of Korea

Correspondence should be addressed to JeongGil Ko;

Received 8 December 2016; Accepted 22 March 2017; Published 4 May 2017

Academic Editor: Shuai Hao

Copyright © 2017 Taewook Heo 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.


For the past decade, wireless sensor networks have focused primarily on data collection. As a result the network topology for these systems was usually heavily centralized. However, for these networks to form a full system, the introduction of proper actuation units and decision-making intelligence is inevitable. Such a new wireless sensor and actuator network system enables new architectural research issues that have not been previously studied. In this work, we introduce the DWSAN system architecture, which effectively combines both sensor and actuation hardware devices to a single network and manages this network so that the actuation decisions are made in a distributed manner and the topology of the network maintains a multitier architecture. Our intensive set of evaluations reveal that, compared to the centralized approach that has been used in most wireless sensor network systems until now, when actuation units are introduced to the system, the DWSAN architecture reduces the transmission load of the network and the actuation decision-making latency by close to twofold and threefold, respectively. Furthermore, we show that this benefit naturally leads to better scalability of the system, making it suitable for various sensing applications in different environments.