Table 1 Notations

E

Composite event

δ

Confidence of the composite event

e _i

Atomic event i

δ _i

Confidence of atomic event i

n

Number of nodes

m

Maximum number of sensing components

T

Convergecast tree rooted at S

T _cluster

Cluster tree rooted at CH

N _j

Node j, 1 ≤ j ≤ n

N_j.{s_j1, s_j2, …, s_jk}

Sensing components of node N_j, 1 ≤ k ≤ m

N_j.E_residual

Residual energy of node N_j

N_j .tp

Parent of node N_j in T

N_j .cp

Parent of node N_j in Tcluster

R _c

Node communication range

A

Deployment area

A.L

Length of the side of the area

E _init

Initial energy of each node