preserving area coverage in wireless sensor networks by using surface coverage relay dominating sets...

Preserving Area Coverage in Wireless Sensor Networks by using

Surface Coverage Relay Dominating Sets

Jean Carle, Antoine Gallais and David Simplot-RylIRCICA/LIFL, Univ. Lille 1, INRIA Futurs, France

ISCC 2005ISCC 2005

SpeakerSpeaker：： Shih-Yun, HsuShih-Yun, Hsu

OutlineOutline Introduction Assumption Related works Surface Coverage Relays - Connected Area Dominating Set

(SCR-CADS) AlgorithmRelay Selection PhaseDecision Phase

Experimental Results Conclusions

IntroductionIntroductionSensor nodes are low-cost, low-power, and

multi-functional devicesSensor nodes are deployed over hostile or

remote environments to monitor a target areaSensor nodes could monitor the whole

environment The network lifetime is important

Connected Area Dominating Set (CADS)

IntroductionIntroductionDominating sets

Dominating Set (DS)Connected Dominating Set (CDS)Area Dominating Set (ADS)Connected Area Dominating Set (CADS)

IntroductionIntroduction

A

BC

D E F

G

H

Dominating Set (DS)Dominating Set (DS)

A

BC

D E F

G

H

Connected Dominating Set (CDS)Connected Dominating Set (CDS)

A

BC

D E F

G

H

Area Dominating Set (ADS)Area Dominating Set (ADS)

A

BC

D E F

G

H

Connected Area Dominating Set Connected Area Dominating Set (CADS)(CADS)

A

BC

D E F

G

H

AssumptionAssumptionSensing range is equal to communication

rangeEach node has a unique priority

Battery stateIdentifier

Sensor nodes know their respective positionPositioning issue has already been addressed in

other papers

Related worksRelated worksA Coverage-Preserving Node Scheduling

Scheme for Large Wireless Sensor NetworksWSNA workshop 2002

Propose a scheduling scheme which allows nodes to sleep or to remain active without compromising the network monitoring taskBlind point

Related worksRelated works

A

B

C

D

E

F

Blind Point

Related worksRelated works

DA

B

C

Surface Coverage Relays - Connected Area Dominating Set (SCR-CADS) Algorithm

Relay Selection PhaseDecision Phase

Relay Selection PhaseComputing connected dominated sets with mul

tipoint relaysINRIA, Tech. Rep. 4597, Oct. 2002.

MultiPoint Relay (MPR)Each two hop neighbor of the nodes has a neighbor in

MPR set

Relay Selection Phase

A

C

BF

DE

Sort(A)={NULL}Sort(A)={C}Sort(A)={C, E}Sort(A)={C, E, F}Sort(A)={C, E, F, D}

Relay Selection PhaseThe node collects information of its neighborsThe node computes its own SCR setThe node broadcasts it to its neighbors

Decision Phase

F

A

B

C

DE

A

B

C

E

Sort(A)={B, C, E, D}

F

Sort(C)={…., F}

Decision PhaseThe node collects relay sets and priorities of its

neighborsThe node decides to be active if it has the high

est priority or if its identifier is in the relay set of the neighbor with highest priority

Experimental ResultsExperimental field： 50 × 50Sensing range = communication range = 10Battery： 100 units

Experimental Results

Experimental Results

Experimental Results

ConclusionsConclusionsSurface Coverage Relays - Connected Area

Dominating Set (SCR-CADS) Without complex computationSensing range and communication are equalSaves energy and prolongs the network lifetimeThis provides energy savings and so prolongs thenetwork lifetime.

Thank You!!Thank You!!