Performance Evaluation of Integrated OTN/WDM Metropolitan Networks in Static and Dynamic Traffic Scenarios

Abstract

The introduction of optical transport network (OTN) switching technology in metropolitan networks enables efficient wavelength bandwidth utilization and reduces the number of wavelengths, leading to reduced network costs. It has been shown that the use of integrated OTN/WDM switch architecture is cost effective because it reduces the number of short-reach client interfaces and the rack space compared to an architecture that uses a re-configurable optical add-drop multiplexer and a separate standalone OTN switch or one that uses back-to-back muxponder connections to perform manual grooming. We have proposed an integrated OTN/WDM switch that allows for significantly lower complexity and cost at the price of relaxing the nonblocking ideal performance requirements normally applied to this kind of switch. In this paper we investigate the impact that the switch blocking has on the network performance in static and dynamic scenarios. We formulate the routing problem in the integrated OTN/WDM network as an integer linear problem and develop an efficient heuristic to evaluate the blocking performance in a static traffic scenario. We study the blocking degradation of the proposed switch in the case of some metropolitan networks, and we show how higher blocking occurs in networks having a larger average node degree. We also show that the degradation of two orders of magnitude in blocking probability occurring under a dynamic traffic scenario can be mitigated with the introduction of a spatial speedup equal to 1.5

Optical Communications and Networking Solutions for the Support of C-RAN in a 5G Environment

“…Ethernet-based technology [2] is probably the more promising and efficient option for the transport of CPRI traffic, but this technology is not yet mature and requires further investigation. For this reason, other solutions have been proposed such as the method based on Optical Transport Network (OTN) [3,4] and Dense Wavelength Division Multiplexing (DWDM) technologies, which are mature and allow for good performance in terms of the delay and jitter.…”

Impact of the Maximum Number of Switching Reconfigurations on the Cost Saving in Network Function Virtualization Environments with Elastic Optical Interconnection

“…In recent years, some researches have been done on network planning problems in NFV environment, which mainly focused on the SFC routing and Virtual Network Function (VNF) deployment problem (e.g., [3][4][5][6]). To minimize the cost of the VNF deployment in an NFV datacenter environment with Optical Network interconnection [7][8][9] , an integer linear programming model was first established, and then three heuristic algorithms were proposed to solve the integer linear programming model effectively [10]. To minimize the total cost of the energy consumption and the revenue loss due to QoS degradation, an efficient algorithm, which is based on the back-to-back strategy, was designed [11].…”

Dimensioning Models of Optical WDM Rings in Xhaul Access Architectures for the Transport of Ethernet/CPRI Traffic

“…The Common Public Rate Interface (CPRI) [2] has been defined to transport the radio samples between the BBUs and the RRUs through the fronthaul network. The main proposed solutions are: Dark fiber [1,5,6], Passive WDM [1,5], WDM/OTN [7,8], WDM/PON [9,10], and Ethernet [11,12].…”

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