Figure 1.
Stages of proposed clustering scheme.
Table 1.
Clustering Estimation.
Table 2.
Cluster Formation.
Table 3.
Switch.
Figure 2.
A snapshot of clustering using the proposed scheme for a large scale deployment of cognitive sensor nodes, with different colored dots representing individual cognitive sensor nodes in different clusters, and the small black squares representing the logical centers of the clusters.
Figure 3.
Cluster head selection overhead vs. number of cognitive sensor nodes in comparison.
Figure 4.
Cluster head selection overhead vs. maximum number of clusters in comparison.
(a) 100 cognitive sensor nodes, (b) 500 cognitive sensor nodes, and (c) 1000 cognitive sensor nodes.
Figure 5.
Cluster joining estimation error with different number of channel and different number of cognitive sensor nodes.
Figure 6.
Interference probability of cluster heads with different number of cognitive sensor nodes in comparison.
Figure 7.
Probability of reclustering with different number of cognitive sensor nodes versus the primary arrival rate .