Wireless Sensor Networks are gaining more and
more importance in present era. Recent Advances in WSN
have extended the applicability of these to wide range of real
time applications. One of these recent advances in WSN is
invention of Heterogeneous Wireless Sensor networks
(HWSN). Compared to Homogenous, Heterogeneous have
large curve of applicability. However, whether it is
Homogenous WSN or Heterogeneous WSN consumption of
energy is un-avoidable. In most of the sensor applications
energy is one of the scarce resource. Hence, the main goal of
any application using WSN is to spend less energy and extend
the lifetime of the WSN. Broadly, the energy conservation
techniques in Wireless Sensor Networks are classified as Data
driven based, Mobility based and Duty cycle based. In this
paper, we are presenting a survey on mobility based energy
conservation techniques for sensor networks (both
homogeneous and Heterogeneous WSNs). Mobility of nodes
could be in the form of sink mobility, relay node mobility or
sometimes sensor node mobility. We are discussing in more
details on sink mobility and relay node mobility based energy
conservation techniques. Present works concentrate only on
one aspect of energy conservation. We are also identifying
some research gaps in the field of energy conservation in
sensor networks considering mobility of nodes in the sensor
network.
Umesh M. Kulkarni : Asst. Prof., Dept. of CSE, KLS’s Gogte Institute of Technology, Belagavi, India.
Vishwshwaray Technological University, Belagavi
Harish H. Kenchannavar : Assoc. Prof., Dept. of CSE, KLS’s Gogte Institute of Technology, Belagavi, India
Vishwshwaray Technological University, Belagavi
Umakant P. Kulkarni : Prof., Dept. of CSE, SDM college of Engineering and Technology, Dharwad, India
Vishwshwaray Technological University, Belagavi
Wireless Sensor Networks(WSN)
Heterogeneous
Wireless Sensor networks (HWSN)
Mobile-sink based Energyefficient
Clustering Algorithm (MECA)
Residual energy
aware routing(REAR)
Load based sink movement(LBM)
Presently WSNs are constrained by many resources like
memory, computation and energy in the network. Out of
these, energy is very vital because without which any
other tasks cannot be accomplished. This makes
conservation of energy as critical for sensor networks. In
this paper, we have done a survey of some of the
mobility-based techniques for energy conservation in
wireless sensor network. Relay based mobility
techniques show better performance compared to sink
based mobility techniques as relay nodes go near the
nodes that have some sensed data. All these techniques
try to utilize the energy in sensors and other nodes in the
network to extend the lifetime of network. However,
these techniques fail to consider the energy spent in the
movement of either sink or relay nodes. From the study
of these techniques, we have also identified some of the
research issues like mobility of nodes, topology
consideration, range, waiting time and different ways of
energy consumption inside the nodes that may be
addressed in future by mobility based energy
conservation.
