An improved cost function-based class of service provisioning scheme for elastic optical networks

Elastic optical network (EON) is a trusted communication network which supports the advance services like 5G/6G, IoT, cloud computing, store-and-forward big-data, high definition video-on-demand, artificial intelligence, and machine learning. Due to the enormous use of these emerging services, the Internet traffic increases manifold time. These services require high and flexible bandwidth with heterogeneous data rate where each service has different characteristics such as prime or fixed, deadline-driven, or delay-tolerant. Based on these characteristics, the static traffic can be categorized as three class of services (CoSs) such as CoS1 (prime and fixed or hard time bound traffic), CoS2 (deadline-driven traffic), and CoS3 (delay-tolerant traffic). In this paper, the improved cost function-based CoS provisioning (ICFCoSP) schemes using two spectrum allocation (SA) methods (i.e., Method-1(M1) and Method-2 (M2)) are proposed called as ICFCoSP-M1 and ICFCoSP-M2, respectively. The proposed ICFCoSP-M1 and ICFCoSP-M2 schemes prioritize the connection requests first according to the cost function value then select an appropriate SA method in which first fit (FF) and last fit (LF) technique are used as per (i) the requested even or odd number of frequency slots (FSs) in M1, and (ii) the value of the cost function in M2, respectively. The cost function includes CoS, requested FS, and pathlength of the selected route. The performance of the proposed schemes is tested on the standard INDIAN and ARPANET network topologies using MATLAB. The rigorous simulation experiments have been performed, and the average results are evaluated on the metric of connection established, bandwidth blocking probability, network spectrum fragmentation, spectrum utilization ratio, network capacity utilization, revenue index, and fairness index. The proposed schemes show significantly improved performances on each evaluating metric as compared to the existing CoS provisioning (CoSP), and cost function-based CoS provisioning (CFCoSP) scheme.