Multimedia Wireless Sensor Networks - LCN

Quality vs. Cost Tradeoff
‣ Cost measure: the cost of using a sensor is a function of its
assigned tolerance range (q):
∑
COST ( θ , q ) = c i
( q )
‣ When the cost is communication overhead, it scales with hop
count, and we can use:
h
= ∗ ∑
i
COST ( θ , qθ
) κ
2
q
θ
∈θ s i
• where κ is a scaling constant and h i is the hop count
‣ Formulate the best sensor selection as an optimization problem:
(Θ Θ ˆ , q ˆq F
= arg min Θ
) Fmin
Θ ⊆ S,q Θ
,COST(Θ,q q Θ )
such that Quality C
( Θ ˆ , q ˆ Θ
) ≥ F min
i∈θ
i
i