I'm studying LEACH protocol (kind of routing protocol in WSN) and as in this paper is said, energy consumption for aggregation function is 5nJ/bit/message.
How did they compute this number?
They explain it in Section 2.1; basically they assume radio hardware that performs better than a Bluetooth transceiver, but the value of 50nJ/bit is chosen arbitrarily. They used transceiver datasheet values from the standard instead of measuring the energy, for Bluetooth they derive (2.7V * 30mA) / 700kbps = 115nJ/bit. For 'current' WSN hardware (CC2420 radio), you would get (1.8V * 17.4mA) / 250kbps = 125nJ (when using the maximum RX power), so 50nJ is still quite good.
Tnx dear Matthias
i knew it
my problem is about energy consumtion of AGGREGATION function.
50nJ is energy of TX and RX of radio
but is page 6,left column, line 9 : "computation
cost of 5 nJ/bit/message to fuse 2000-bit messages (fuse or aggregation)"
I don't know how did it compute!
I need it because I wanna to add another algorithm like MAC (message autentication code) so I can compute the energy consumtion of any algorithms
Am I wright?
Sorry, I thought you were talking about the radio ...
In a later paper [1] they describe an energy model for software in more detail, if they don't mention how they derive the computation power draw I guess they assumed something similar there; calculating the power draw of a microcontroller for a number of instructions needed for fusing the bits divided by the uC clock speed.
[1] Alice Wang, Wendi B. Heinzelman, Amit Sinha und Anantha P. Chandrakasan,
"Energy-Scalable Protocols for Battery-Operated MicroSensor Networks."
http://www.springerlink.com/content/r1v57568m8310331/
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