Energy-efficient Protocols for Wireless Communication in Biosensor Networks
Advances in semiconductor
technology have made it possible to build miniature but reliable
biosensors. A network of such biosensors can be implanted in
humans for health monitoring and prosthesis. However, such
networks are fundamentally different from other wireless networks. They
have a continuous but very small source of power. This energy
constraint necessiates the use of highly energy-efficient communication
protocols. We present two such protocols in the context of a
biomedical application we are working on, namely retinal
prosthesis. Our first approach is a cluster-based protocol in
which only a small fraction of the nodes make expensive long distance
transmits to the external base station. Our second approach is a
tree-based protocol. We also analyse the energy efficiency of these
protocols while varying parameters such as number of nodes in the
system and distance between nodes. Our analysis shows that the cluster
based protocol has better energy performance.
Keywords: network protocols,
energy efficiency, wireless LAN, embedded sensors, biomedical
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