GDL

Energy Efficient Global Clock Synchronization for Wireless Sensor Networks

2010
Undergraduate Theses from gdlhub / 2017-08-14 11:52:32
Oleh : Vinod Namboodiri , Suresh Ramamoorthy, International Journal of Wireless & Mobile Networks (IJWMN)
Dibuat : 2012-06-23, dengan 1 file

Keyword : Energy , Efficient , Global , Clock , Synchronization for Wireless , Sensor , Networks
Subjek : Energy Efficient Global Clock Synchronization for Wireless Sensor Networks
Url : http://airccse.org/journal/jwmn/0510ijwmn13.pdf
Sumber pengambilan dokumen : Internet

Clocksynchronizationiscriticaltomanysensornetworksforthesuccessoftheapplicationaswellasenergy


efficiency.Achievingaglobaltimeframethroughlocalized averagingofclockvaluesformultipleroundstillconver-


genceisapromisingapproachtoclocksynchronizationduetothedecentralizednatureofcomputationcoupledwith


scalability.However,itisnotclearwhatpowerlevelsforallnodeswouldmakethesynchronizationprocessenergy-


efficient.Largepowerlevelsleadtofasterconvergencebut consumealotofenergyperroundofsynchronization.


Ontheotherhand,smallerpowersconsumelittleenergyperround,butconvergenceisveryslowrequiringalot


ofroundstoachievesynchronization.Inthispaperwelookattheproblemoffindingapowerassignmentthat


achievesglobalclocksynchronizationinthemostenergy-efficientmannerpossible.Welookattheproblemthrough


twodimensions;rateofconvergenceandenergyconsumedper roundofsynchronization.Acentralizedalgorithmis


presentedthatusesthepathcongestionoftheinducedcommunicationgraphtoestimatewhichpowerassignments


havegoodconvergencepropertiesandfindonethatminimizes thetotalenergytoachieveclocksynchronization.


Ourevaluationdemonstratesthatthepowerassignmentderivedfromthisalgorithmisveryenergy-efficientandis


applicableforwirelesscommunicationenvironmentswithvariousdistance-powergradients.Further,wepresenta


simpledistributedalgorithmwhichnodescanexecutelocallytoderiveenergy-efficientpowerlevelsforglobalclock


synchronization,andisespeciallyusefulinlarge-scaledeployments.

Deskripsi Alternatif :

Clocksynchronizationiscriticaltomanysensornetworksforthesuccessoftheapplicationaswellasenergy


efficiency.Achievingaglobaltimeframethroughlocalized averagingofclockvaluesformultipleroundstillconver-


genceisapromisingapproachtoclocksynchronizationduetothedecentralizednatureofcomputationcoupledwith


scalability.However,itisnotclearwhatpowerlevelsforallnodeswouldmakethesynchronizationprocessenergy-


efficient.Largepowerlevelsleadtofasterconvergencebut consumealotofenergyperroundofsynchronization.


Ontheotherhand,smallerpowersconsumelittleenergyperround,butconvergenceisveryslowrequiringalot


ofroundstoachievesynchronization.Inthispaperwelookattheproblemoffindingapowerassignmentthat


achievesglobalclocksynchronizationinthemostenergy-efficientmannerpossible.Welookattheproblemthrough


twodimensions;rateofconvergenceandenergyconsumedper roundofsynchronization.Acentralizedalgorithmis


presentedthatusesthepathcongestionoftheinducedcommunicationgraphtoestimatewhichpowerassignments


havegoodconvergencepropertiesandfindonethatminimizes thetotalenergytoachieveclocksynchronization.


Ourevaluationdemonstratesthatthepowerassignmentderivedfromthisalgorithmisveryenergy-efficientandis


applicableforwirelesscommunicationenvironmentswithvariousdistance-powergradients.Further,wepresenta


simpledistributedalgorithmwhichnodescanexecutelocallytoderiveenergy-efficientpowerlevelsforglobalclock


synchronization,andisespeciallyusefulinlarge-scaledeployments.

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