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Wireless Sensor Networks : Technology, Protocols, and Applications

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CASE STUDY: SIMPLE COMPUTATION OF THE SYSTEM LIFE SPAN 299<br />

Figure 11.7 Energy index versus packet length: ðaÞ packet overhead ðOÞ is 2 bytes;<br />

ðbÞ O is 10 bytes.<br />

aggregation efficiency. For example, if c is reduced through choosing more leader<br />

nodes, the spatial correlation will increase <strong>and</strong> the aggregation efficiency should<br />

improve; however, this will increase the forward hop count <strong>and</strong> end-to-end packet<br />

delay <strong>and</strong> therefore the energy consumed for each packet. Moreover, the smaller<br />

c can reduce the energy consumption ðe m Þ in the MAC layer by lowering the collision<br />

probability.

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