Request differentiation in dynamic light-path establishment for WDM routed all optical networks of data centers

• Solving dynamic RWA by request buffering to increase total throughput and channel utilization.
• Improving throughput and channel utilization at the expense of a slight increase in blocking rate.
• Performance of data center networks is enhanced in terms of different metrics.
• Providing performance and complexity analyses for comparison purposes.

Existing routing and wavelength assignment (RWA) solutions try to minimize the blocking rate as the main quality of service (QoS) metric. However, in ultra high-speed all optical interconnection networks of data centers, more important metrics such as network throughput and channel utilization are of interest for network designers. This paper proposes dynamic request buffering routing and wavelength assignment (DRB-RWA) that aims at maximizing the network throughput and total amount of transmitted data in addition to minimizing the blocking rate by proposing a dynamic RWA scheme based on request differentiation. The proposed scheme tries to exploit buffering approach in order to be able to achieve a pseudo static traffic out of a dynamic traffic; and hence, it would be able to differentiate requests in terms of desired metrics. However, conventional dynamic RWA solutions solely aim at minimizing the blocking rate. We evaluate the performance of the proposed algorithm via analytical approach as well as comprehensive simulations to confirm the fact that the network throughput, and therefore, total amount of transmitted data are maximized when the proposed scheme is applied.