Authors
1 College of Information Eng., Al-Nahrain University, Baghdad, Iraq.
2 College of Engineering., Al-Nahrain University, Baghdad, Iraq
Abstract
Internet of Things (IoT) enables things to have connectivity through
the internet. The number of things is growing fast and has to be uniquely
identified through the Internet to communicate with other things. In Wireless
Sensor Networks (WSNs) each node can be considered as a thing. WSN node
resources are very limited due to the need to communicate using low power and
usually through unreliable links. Such limitations need an energy efficient
routing protocol. WSN is considered as a type of Low power and Lossy
Network (LLN). The routing protocol for low power and lossy network (RPL)
is being adopted for LLN and has been standardized to enable connectivity of
WSN over IoT. RPL constricted a topology similar to tree topology. Nodes in
RPL optimized its path using an objective function (OF). OF depends on
different node/link metrics in the optimization process. In this paper, an Energy
Threshold RPL (ETRPL) protocol is proposed. ETRPL depends on a new
objective function to enhance energy consumption of RPL protocol by taking
into account the remaining energy of the preferred parent node. ETRPL is
implemented using Cooja simulator. The results show that ETRPL provides an
increase in the remaining energy of at least 87.4% for a small area with high
number of nodes. ETRPL also performed better with regards to Time Delay,
Packet Reception Ratio, and the number of dead nodes in a small area. For a
large area, the performance is not encouraging. Thus the proposed ETRPL
protocol is useful for IoT networks with relatively small areas.
Keywords
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