Massive data traffic demand for satellite networks has been increased with the emergence of global broadband services. Due to limited onboard processing capacity and imbalanced distribution of global traffic, severe link congestion may occur in hot spots, deteriorating the performance of the whole network. A link cost modification applied in load balancing algorithm based on artificial bee colony is proposed for routing and wavelength assignment problem to distribute traffic in advance. Moreover, congestion avoidance based on wavelength utilization is designed for unexpected congestion to minimize the adverse impact of congestion on network performance. Experiment results show that the method we proposed realizes high performance in communication success rate and average transmission delay and also achieves the maximum utilization of wavelength utilization under the condition of low blocking rate and the equalization of traffic load.
In the satellite optical network based on wavelength routing, the uneven distribution of global traffic is easily lead to network congestion and unreasonable utilization of resources. Besides, security of communication has attracted tremendous attention due to the openness of satellite network. In this paper, mobile agents are used to implement routing and wavelength assignment (RWA) in satellite networks while considering global traffic distribution. The simulation results show that the proposed algorithm can effectively balance the traffic load, reduce blocking rate and improve the communication success rate of the network on the basis of security mechanism.
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