Table 1 Nomenclature
Notation | Description |
|---|---|
Φ i | Cluster with the i th node as the cluster head. |
T | Total number of channels in the network. |
n | Number of SUs. |
C i | List of idle channels sensed by the i th SU. |
N i | List of neighbors of the i th SU. |
γ | Transmission range of SU or PU. |
G i (S1, S2, E) | Undirected bipartite graph at the i th SU. |
S 1 | Set of vertices including the i th SU and its neighborsN i . |
S 2 | Set of vertices including a list of channels C i available with the i th SU. |
X i | Nodes in the chosen maximum edge biclique graph of the i th SU. |
Y i | Channels in the chosen maximum edge biclique graph of the i th SU. |
Q(X i , Y i ) | Sub-graph of graph G, known as a multiple-edge biclique graph. |
Z m | Common control channels assigned to the m th cluster |
F | Number of elements in X i . |
K | Number of elements in Y i . |
w i | Weight assigned to the i th SU based on the product of X i andY i . |
d im | Degree of connectivity of an i th node to its neighbor node belonging to cluster m, i.e., the intersection of C i and a set of idle channels chosen for cluster m. |
σ | PU arrival rate; refers to how often a PU occupies a channel. |
α | Average number of intra-cluster control channels per cluster in the entire CRAHN. |
β | Average number of inter-cluster control channels per cluster in the entire CRAHN. |