Figure 6From: GSM: gateway selection mechanism for strengthening inter-cluster coordination in cognitive radio ad hoc networksImpact of number of PUs and arrival rate on average number of intra-cluster control channels ( α ). Arrival rate (varying from 0.1 to 0.5). (a) σ = 0.1, (b) σ = 0.3, (c) σ = 0.5.Back to article page