FRA: A new fuzzy-based routing approach for optical transport networks

Abstract

Providing networks with QoS guarantees is one of the key issues to support current and future expected clients' demands. In this scenario, QoS routing is definitely critical as being responsible for defining those optimal routes supporting traffic forwarding throughout the whole network. This paper proposes two new QoS-aware RWA algorithms dealing with the routing inaccuracy problem, aiming at reducing blocking probability while limiting signaling overhead and balancing network load. The proposed algorithms extend the work already published by the authors on prediction based routing by adding a novel fuzzy-based technique featuring a powerful tool for modeling uncertainty. The proposed algorithms are compared with a well-known RWA algorithm and results show the benefit of introducing the fuzzy techniques in the RWA selection.Peer ReviewedPostprint (published version

A novel predictive PCE-based protection strategy for resilient transport networks

“…However, unlike authors in [12], which use a coarsegranularity approach (predictive counters per lightpath), PNCP adopts a ne-granularity approach for predictive counters (predictive counters per link-wavelength).…”

“…The proposed strategy so-called PNCP uses predictive counters (P i,λ ) to predict the availability of a wavelength along a link instead of along a lightpath (as the study on [12]). However, similar to [12], PNCP uses two-bit predictive counters, where values from 0 up to 1 predict that a lightpath is available along link i using wavelength λ, whereas values from 2 up to 3 predict the contrary, see Fig.…”

“…However, similar to [12], PNCP uses two-bit predictive counters, where values from 0 up to 1 predict that a lightpath is available along link i using wavelength λ, whereas values from 2 up to 3 predict the contrary, see Fig. 5.…”

“…Moreover, PNCP adopts the concept of predictive counters for routing purposes. Predictive counters are a technique widely used to deal with the negative impact of inaccurate NSI and for avoiding its dissemination [12].…”

Handling outdated information in optical PCE environments

“…This study also showed that path computation algorithms that are considered optimal under accurate NSI, conduct suboptimal performance in comparison with other schemes. Recent contributions dealing with the RI problem in optical networks can be found in [6], [7] and [8]. However, none of these studies consider to position the RI problem in a DCN scenario, taking into consideration topologies and traffic models common of these type of scenarios.…”