spatial correlation-based collaborative medium access control in wireless sensor networks authors :...
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Spatial Correlation-Based Collaborative Medium Access
Control in Wireless Sensor Networks
Authors : Mehmet C. Vuran, Ian F. Akyildiz Authors : Mehmet C. Vuran, Ian F. Akyildiz Georgia Institute of Technology Georgia Institute of Technology Published : IEEE/ACM TRANSACTIONS ON Published : IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 14, NO. 2, APRIL 2006 NETWORKING, VOL. 14, NO. 2, APRIL 2006
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OutlineOutline
IntroductionIntroduction
DefinitionDefinition
CC-MACCC-MAC– E-MACE-MAC– N-MACN-MAC
SimulationSimulation
ConclusionConclusion
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IntroductionIntroduction
MotivationMotivation– dense sensor deployment – several sensor nodes record information about a single
event in a sensor field– separated sensor nodes are more useful
GoalGoal– selecting the min nodes in the event region as
representative nodes , M. And the distortion DE(M) is minimized
– at the MAC layer, reduce the energy consumption filters out the correlation in source records
– prioritizes the transmission of route-thru packets over other packets
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DefinitionDefinition
Correlation region : In each this region select only one representative node. And the distortion DE(M) is less than Dmax.
Correlation Radius ,rcorr : The radius of the correlation region
Correlation Neighbor : distance between this node and representative node is less then correlation radius
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CC-MACCC-MAC
the sink, determines the correlation radius, rcorr , for a distortion constraint, Dmax,
rcorr is then broadcast to each sensor node during the network setup
use a CSMA/CA based medium access control
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CC-MACCC-MAC
contains two components– Event MAC (E-MAC), filters out the correlated rec
ords– Network MAC (N-MAC) ensures prioritization of r
oute-thru packets
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E-MACE-MAC
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C D
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E-MACE-MACC
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RTSBT
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BT RTS
CTS
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DATA
DATA
ACK
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IBT
RTS
CTS
DATA
ACK
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N-MACN-MAC
the route-thru packet must be given priority over the packets generated by another concurrent eventA node in a correlation region with a route-thru packet listens to the channel for PCF Inter Frame Space (PIFS) time units, which is smaller than the DCF Inter Frame Space (DIFS) used by the nodes performing E-MAC
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SimulationSimulation
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SimulationSimulation
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SimulationSimulation
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SimulationSimulation
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SimulationSimulation
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SimulationSimulation
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SimulationSimulation
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SimulationSimulation
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SimulationSimulation
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ConclusionConclusion
allowing only a subset of sensor nodes to transmit their data to the sink
the proposed MAC protocol not only conserves energy, but also minimizes unnecessary channel access contention