Dynamic adaptive spectrum allocation in flexible grid optical network with multi‐path routing

Abstract

Fragmentation is one of the major issues in elastic optical network (EON) due to its dynamic characteristics which may possibly degrade the spectrum efficiency. Several techniques have been presented in the literature to get the optimal solution of this problem while multi-path provisioning comes out to be very compelling among them. In multi-path provisioning enable networks, multi-path routing and spectrum assignment (MPRSA) creates further complications due to the hardware availability and more spectrum consumption. This paper presents a novel technique termed as adaptive service provisioning (ASP) to come up with a solution of the MPRSA problem and it minimizes the spectrum fragments in the network by precisely managing the scattered spectrum slots. This technique performs the adaptive traffic demand splitting on disjoint paths in case it is unable to be served by k-shortest routing paths based on the parameters such as hardware support, capacity available and demand. An integer linear programming (ILP) model as well as a heuristic algorithm for solving MPRSA problem in large optical networks where ILP is not compliant is developed. Numerical simulations are performed to investigate the performance of the algorithm in terms of blocking probability and spectrum utilization.

Impairment‐aware resource allocation scheme for elastic optical networks with different service priorities

“…IP-over-wavelength division multiplexing (WDM) networks) may soon exhaust the available spectrum resources in optical networks [7,[10][11][12]. Hence, elastic optical networks (EONs) are widely accepted to be the key enabling technology of future high-capacity and high-bandwidth internet [1,7,[13][14][15][16][17].…”

Dynamic multi-hop multipath RMSA and traffic grooming in OFDM-based sliceable elastic optical networks

“…Previous works on multipath RSA in EON that do not consider differential delay bound can be found in [5,[9][10][11]13,14,17,[23][24][25]29,30,33,34,[36][37][38][39]. Multipath RSA problems studied in these previous works can be classified into static multipath RSA problems [23,24,30,36] or dynamic multipath RSA problems [5,[9][10][11]13,14,17,25,29,33,34,[37][38][39] depending on whether connection requests are given in advance or arrival/terminating dynamically. Most of these previous works considered networks with multiple modulation formats [9,10,13,14,17,23,25,29,30,[36][37][38]…”

“…Multipath RSA problems studied in these previous works can be classified into static multipath RSA problems [23,24,30,36] or dynamic multipath RSA problems [5,[9][10][11]13,14,17,25,29,33,34,[37][38][39] depending on whether connection requests are given in advance or arrival/terminating dynamically. Most of these previous works considered networks with multiple modulation formats [9,10,13,14,17,23,25,29,30,[36][37][38][39], i.e., these authors studied multipath RMSA problems. The rest of these previous works considered networks with a single modulation format [5,11,24,33,34].…”

“…Among these previous works, traffic grooming mechanisms are employed in [11] and [13]. No traffic grooming mechanism was used in [5,10,14,17,[23][24][25]29,30,33,34,[36][37][38][39].…”

Hybrid Policy of Routing and Spectrum Assignment in Elastic Optical Networks

“…RSA (Routing and spectrum allocation) problem is solved whenever there is a connection request in elastic optical networks [1] [2] [3]. This problem is consists of two sub-problems which are routing (R) and spectrum allocation (SA).…”