ISSN : 1796-2056
Volume : 2    Issue : 6    Date : December 2007

Congestion Avoidance and Energy Efficient Routing Protocol for Wireless Sensor Networks with
aMobile Sink
Majid I. Khan, Wilfried N. Gansterer, and Günter Haring
Page(s): 42-49
Full Text:
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Congestion severely affects the performance of a wireless sensor network in two aspects:
increased data loss and reduced lifetime. This paper addresses these problems by introducing a
mobile sink based routing scheme for congestion avoidance and energy efficient routing in wireless
sensor networks. The proposed scheme utilizes the sink mobility and an in-network storage model
that is used to set up mini-sinks along the mobility trajectory of the sink. Mini-sinks are responsible
for collecting data from the sensor nodes located in their vicinity, thus avoiding data flow to a single
data collection point, e.g., a static sink that is the major cause of congestion, data loss and reduced
lifetime of the sensor network. Also, in the proposed scheme data only has to travel a limited
number of hops to reach the nearest mini-sink which helps to improve the energy consumption of
the sensor nodes. Through simulation we show the effectiveness of the given routing scheme in
terms of congestion avoidance and increased lifetime of the wireless sensor network.

Index Terms
congestion avoidance, energy efficient routing, mobile sink, wireless sensor networks