loading page

Multi-objective Optimization of Asymmetric Bit Rate Partitioning for Multipath Protection in Elastic Optical Networks
  • +1
  • Henrique Dinarte ,
  • Raul Almeida Jr. ,
  • Karcius Assis ,
  • Daniel Chaves
Henrique Dinarte
University of Pernambuco / Federal University of Pernambuco

Corresponding Author:[email protected]

Author Profile
Raul Almeida Jr.
Author Profile
Karcius Assis
Author Profile
Daniel Chaves
Author Profile

Abstract

In survivable elastic optical networks, multi-path protection combined with traffic squeezing has recently gained attention. Link-disjoint multipath routing (LD-MPR) and bandwidth squeezing protection (BSP) when applied to the routing, modulation level and spectrum assignment problem are efficient strategies to address the excessive bandwidth demanded by protected services, spectral fragmentation and link-load balancing. LD-MPR enables the division of service transmission bit rate into independent flows whereas BSP tolerates traffic reduction under link failure. An open issue in the literature is how to efficiently divide demanded traffic among the link-disjoint routes under dynamic-traffic and BSP, while complying the SLA. We propose in this paper a multi-objective-  optimization genetic algorithm that defines how service transmission bit rate should be partitioned among the candidate link-disjoint routes. A customized partitioning definition is made for each source-destination node pair in the network, aiming the simultaneous minimization of network blocking probability and average squeezing transmission bit rate experienced by the services during single-link failure. We also propose, for the first time, a fixed-alternate routing using groups of disjoint paths (FARgdp). Complex dynamic-traffic network scenarios that simultaneously consider BSP, LD-MPR and FARgdp are addressed.