Investigation of cost and spectrum utilization in internet protocol-over-elastic optical networks
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RESEARCH ARTICLE
Investigation of cost and spectrum utilization in internet protocolover-elastic optical networks Sridhar Iyer1
Received: 5 June 2018 / Accepted: 13 July 2020 The Optical Society of India 2020
Abstract In the current work, we investigate the cost and the spectrum utilization in an IP-over-elastic optical network (IP-o-EON) by formulating a multiple-layer survivability problem. We formulate novel ILPs to obtain the solutions by considering joint failures, wherein a single step dimensions the network under the consideration of its operation which is normal and also with all the single failures. The ILPs also aim at the following two levels of survivability: (i) single optical link failure and (ii) single optical link, and optical and IP node failure. The simulations are conducted considering realistic network topologies, traffic matrices, and models for cost. The obtained results demonstrate that the proposed combined multiplelayer methods (i) are highly efficient owing to the use of (a) IP grooming capability(s) and (b) primary and backup resource(s) sharing and (ii) result in significant savings of the CapEx. The results also make it evident that there occurs a definite trade-off between CapEx and spectrum utilization in an IP-o-EON since inclusion of failure analysis within the design process results in extra traffic load in various failure states which results in the proposed combined methods demonstrating higher (worst) spectrum utilization. Keywords EONs Multiple-layer network planning ILP Resilience Protection
& Sridhar Iyer [email protected] 1
Department of ECE, S.G. Balekundri Institute of Technology, Shivabasava Nagar, Belagavi, Karnataka 590010, India
Introduction The increase in volume and dynamicity of the Internet traffic has put an immense amount of pressure on the network infrastructures. In order to meet the demands of the current heterogeneous services such as cloud-based services, video on demand, and teleconferencing, the network operators have had to deal with the issue of network dimensioning in view of the anticipated large volumes of Internet Protocol (IP) traffic and, also, simultaneously have had to ensure the same or even minimized costs. Currently, the optical transport networks (OTNs), which are over dimensioned to deal with the IP traffic peaks, are based on the fixed-grid wavelength division multiplexed (WDM) technology which assumes the use of a particular transceiver type and in which only a single demand serving method exists that fixes the bit rate, the transmission reach (TR), and the spectrum utilization. However, such fixedgrid OTNs are required to admit all the channels within a fixed frequency grid which may not be adequate for highspeed channels and may also under-utilize the spectrum for the low bit rate requests [1]. Hence, a new paradigm of elastic optical network (EON) technology has emerged for the OTNs in which, (i) on the basis of requirement(s), wider channels are created by combining spectrum units (or frequency slots (FSs)) and
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