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Sudhakar Pandey et al 2 Network
performances can be improved by using cross-layer approach. Application of
transmission power control technique to adjust transmission power results in
reduction of energy consumption. ED is considered to calculate the weight   associated with each node. D stands for degree
and E stands for energy. Energy consumption is reduced and network performance
is improved by Control overhead reduction during route discovery and dynamic
adjustment of transmission power. The energy model of wireless sensor network
can be defined as the total energy consumption of the network, including all
its units, be it sensor device components, energy consumed in routing or route
maintenance, topology maintenance or whosoever it may be. Generating an energy
model is an important part of any protocol development and its performance
evaluation. Here we considered a network with n mobile sensor nodes and one
sink node which is static.Energy consumed by sensor device:The
sensor device comprises of processing units, sensing unit, memory unit and
transceiver unit. So, energy consumption of each unit needs to be considered.

E Sensor
Device = E processor + E sensor +

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                              Ememory+Etransceiver            (1)                                                                                      

Where E Sensor Device is the total energy consumed by
a sensor device, E processor is the energy consumed by the processing units, E sensor
is the energy consumed by the sensing unit, E memory is the energy consumed by
the memory unit and E transceiver is the energy consumed by the transceiver
unit.Since network lifetime is an important performance criterion Sensor nodes
operate for years. Energy consumption plays an important role in network
lifetime. In working with network mobility is an important factor. About 70% of
network’s energy is consumed in data communication. By taking average of
Received Signal Strength (RSS) values, transmission power can be enhanced by
Cross-Layer design approach for Power Control.


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