Spatial Correlation-Based Collaborative Medium Access Control in Wireless Sensor Networks Authors : Mehmet C. Vuran, Ian F. Akyildiz Georgia Institute.

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Spatial Correlation-Based Collaborative Medium Access Control in Wireless Sensor Networks Authors : Mehmet C. Vuran, Ian F. Akyildiz Georgia Institute of Technology Published : IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 14, NO. 2, APRIL 2006

Outline IntroductionDefinitionCC-MAC –E-MAC –N-MAC SimulationConclusion

Introduction Motivation – –dense sensor deployment – –several sensor nodes record information about a single event in a sensor field – –separated sensor nodes are more usefulGoal – –selecting the min nodes in the event region as representative nodes, M. And the distortion D E (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

Definition Correlation region : In each this region select only one representative node. And the distortion D E (M) is less than D max. Correlation Radius,r corr : The radius of the correlation region Correlation Neighbor : distance between this node and representative node is less then correlation radius

CC-MAC the sink, determines the correlation radius, r corr, for a distortion constraint, D max, r corr is then broadcast to each sensor node during the network setup use a CSMA/CA based medium access control

CC-MAC contains two components – –Event MAC (E-MAC), filters out the correlated records – –Network MAC (N-MAC) ensures prioritization of route-thru packets

E-MAC C D F A G E H B I J K L M O N Q S R P T

C D F A G E H B I J K L M O N Q S R P T E-MAC C D O H M R T RTSBT RTS CTS DATA ACK I BT RTS CTS DATA ACK

N-MAC the route-thru packet must be given priority over the packets generated by another concurrent event A 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

Simulation

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Conclusion 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