Hop distance–based bandwidth allocation technique for elastic optical networks

Abstract

Summary Elastic optical networks (EON) have emerged as a solution to the growing needs of the future internet, by allowing for greater flexibility, spectrum efficiency, and scalability, when compared to WDM solutions. EONs achieve those improvements through finer spectrum allocation granularity. However, due to the continuity and contiguity constrains, distant connections that are routed through multiple hops suffer from increased bandwidth blocking probability (BBP), while more direct connections are easier to form. This paper proposes HopWindows, a novel method that strategically allocates bandwidth to connections based on their hop distance. This new algorithm applies masks that control the range of frequency slots (FSs) allocated to each n‐hop connection. Furthermore, a new network metric is introduced, the normalized bandwidth blocking probability (normalized BBP). Utilization of this metric ensures increased fairness to distant connections. Extended simulation results are presented which indicate that the proposed HopWindows method achieves a superior performance over the well‐known FirstFit algorithm. The proposed algorithm may achieve a decrease in bandwidth blocking probability of up to 50%.

Adaptive modulation allocation algorithm in elastic optical networks

“…In elastic optical networks, energy consumption may be significantly reduced through some new features such as optical traffic grooming and optical layer bypass. Compared to traditional optical networks, elastic optical networks offer the lowest blocking probability 24,25 and, thus, can accept higher volumes of traffic. This is a huge benefit in terms of energy efficiency, since the deployment of additional network elements would not raise the cost, but would increase energy consumption.…”

RDMSR: A reactive defragmentation with minimum spectrum route strategy for mixed grid optical network

“…At present generation, Internet of Things (IoT), wireless sensor network (WSN), mobile network, health care services, online streaming, and so on have increased the data consumption in many folds. [1][2][3][4][5][6][7][8] The immense growth of data demand drives the network service providers for gradually upgrading the network from traditional fixed grid wavelength division multiplexing (WDM) network to flexible elastic optical network. This co-existed fixed and flexible nodes network is known as mixed-grid optical network.…”

“…On contrary, in elastic node architecture, bandwidth variable transponder has flexibility to assign sub and super channel as per the bandwidth demand by user. [4][5][6][7][8][9] Due to spectrum continuity and contiguity constraints, bandwidth assignment on the links of the route is a major challenge, and it becomes more complicated if the route of connection request consists of fixed and flexible nodes. Fixed node allocates single or integer multiple of the wavelength of larger bandwidth slot which results spectrum redundancy.…”

Hybrid strategy for routing, modulation and spectrum assignment in elastic optical networks

“…Many papers in the literature have attempted to assess the significance of saving frequency spectrum in the prevention of network capacity crunch (Chralyvy, 2009;Waldman, 2018;Mavridopoulos et al, 2020). The granularity and correct elastic bandwidth assignment are challenges to be overcome when designing EON optimization algorithms.…”