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SEP:?A?Stable?Election?Protocol?for?clustered?heterogeneous?wireless?sensor?networks
Overview
We?study?the?impact?of?heterogeneity?of?nodes,?in?terms?of?their?energy,?in?wireless?sensor?networks?that?are?hierarchically?clustered.?We?assume?that?a?percentage?of?the?population?of?sensor?nodes?is?equipped?with?additional?energy?resources?-?this?is?a?source?of?heterogeneity?which?may?result?from?the?initial?setting?or?as?the?operation?of?the?network?evolves.?We?show?that?the?behavior?of?such?sensor?networks?becomes?very?unstable?once?the?first?node?dies,?especially?in?the?presence?of?node?heterogeneity.?Classical?clustering?protocols?assume?that?all?the?nodes?are?equipped?with?the?same?amount?of?energy?and?as?a?result,?they?can?not?take?full?advantage?of?the?presence?of?node?heterogeneity.
Main?Idea
We?propose?SEP,?a?heterogeneous-aware?protocol?to?prolong?the?time?interval?before?the?death?of?the?first?node?(we?refer?to?as?stability?period),?which?is?crucial?for?many?applications?where?the?feedback?from?the?sensor?network?must?be?reliable.?SEP?is?based?on?weighted?election?probabilities?of?each?node?to?become?cluster?head?according?to?the?remaining?energy?in?each?node.
Main?Results
We?show?by?simulation?that?SEP?always?prolongs?the?stability?period?compared?to?(and?that?the?average?throughput?is?greater?than)?the?one?obtained?using?current?clustering?protocols.?Our?main?contributions?are:
Our?SEP?protocol?successfully?extends?the?stable?region?by?being?aware?of?heterogeneity?through?assigning?probabilities?of?cluster-head?election?weighted?by?the?relative?initial?energy?of?nodes.
Due?to?extended?stability,?the?throughput?of?SEP?is?also?higher?than?that?of?current?(heterogeneous-oblivious)?clustering?protocols.
The?performance?of?SEP?is?observed?to?be?close?to?that?of?an?ideal?upper?bound?obtained?by?distributing?the?additional?energy?of?advanced?nodes?uniformly?over?all?nodes?in?the?sensor?field.
SEP?is?more?resilient?than?LEACH?in?judiciously?consuming?the?extra?energy?of?advanced?nodes?-?SEP?yields?longer?stability?region?for?higher?values?of?extra?energy.
Documentation:?
"SEP:?A?Stable?Election?Protocol?for?clustered?heterogeneous?wireless?sensor?networks"
Georgios?Smaragdakis,?Ibrahim?Matta?and?Azer?Bestavros.
Second?International?Workshop?on?Sensor?and?Actor?Network?Protocols?and?Applicatio
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