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http://dx.doi.org/10.9709/JKSS.2010.19.4.011

An Efficient Routing Scheme based on Link Quality and Load Balancing for Wireless Sensor Networks  

Kim, Sun-Myeng (금오공과대학교 컴퓨터공학부)
Yang, Yeon-Mo (금오공과대학교 전자공학부)
Abstract
ZigBee is a standard for wireless personal area networks(WPANs) based on the IEEE 802.15.4 standard. It has been developed for low cost and low power consumption. There are two alternative routing schemes that have been proposed for the ZigBee standard: Ad-hoc On-Demand Distance Vector(AODV) and tree routing. The tree routing forwards packets from sensors to a sink node based on the parent-child relationships established by the IEEE 802.15.4 MAC topology formation procedure. In order to join the network, a sensor node chooses an existing node with the strongest RSSI(Received signal strength indicator) signal as a parent node. Therefore, some nodes carry a large amount of traffic load and exhaust their energy rapidly. To overcome this problem, we introduce a new metric based on link quality and traffic load for load balancing. Instead of the strength of RSSI, the proposed scheme uses the new metric to choose a parent node during the topology formation procedure. Extensive simulation results using TOSSIM(TinyOS mote SIMulator) show that the CFR scheme outperforms well in comparison to the conventional tree routing scheme.
Keywords
Cost function; Routing protocol; Tree routing; Sensor network; WPAN; ZigBee;
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