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Finally, the importance of using parallel transmissions is addressed, and a brief argument for TDMA's superiority over CSMA/CD for continuous data gathering is made.
3.5 Analysis of TDMA versus CSMA/CD
The primary reason for setting up this schedule, rather than simply using CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is that CSMA/CD wastes energy in an energy-constrained sen- sor network.
Nodes are able to communicate by CSMA/CD us- ing a known power-level that is agreed upon a- priori.
Nodes are able to estimate distances (in the com- munication sense, not the spatial sense) to the origi- nators of a particular CSMA/CD signal by compar- ing their observed signal strength with the known power of transmission.1
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