Traffic dynamics in scale-free networks with limited packet-delivering capacity

We propose a limited packet-delivering capacity model for traffic dynamics in scale-free networks. In this model, the total node’s packet-delivering capacity is fixed, and the allocation of packet-delivering capacity on node ii is proportional to kiϕ, where kiki is the degree of node ii and ϕϕ is a adjustable parameter. We have applied this model on the shortest path routing strategy as well as the local routing strategy, and found that there exists an optimal value of parameter ϕϕ leading to the maximal network capacity under both routing strategies. We provide some explanations for the emergence of optimal ϕϕ.