Multilayer Control for Packet-Optical Networks [Invited]

Abstract

This paper describes a novel multilayer (ML) path computation element (PCE) architecture based on a hybrid approach. Such a method operates in all network life cycles, optimizing both the design and the operative phases. The hybrid PCE is based on combined non-realtime and real-time operation and is able to integrate control and management functions. This architecture results in a reduction of overprovisioning during network design while guaranteeing availability of traffic by using controlplane-driven dynamic recovery schemes. It introduces advanced control functionality into the network, providing an easy-to-integrate solution. To fully exploit the control plane capabilities, a new architecture of colorless, directionless, and contentionless reconfigurable optical add/ drop multiplexers and its related cost model are also presented. The solution has been assessed by simulations on the Spanish backbone network of Telefonica. The simulation analysis demonstrates the good performance of the proposed ML solution. The reduction of overprovisioning allows a capital expenditure saving of up to 46% with respect to a single-layer approach without any effect on the level of survivability of the traffic, thanks to new ML recovery schemes.

Managing resilience in carrier grade networks: Survey, open issues and trends

“…[87], [91], [92], [93], [94] PCE [95], [96], [97], [85], [98], [99] ILSA and Service-Oriented schemes [100], [101], [42], [102], [103] is worth mentioning that recovery schemes for hybrid network must be able to solve complex failure scenarios.…”

Abstraction Models for Optical 5G Transport Networks

“…Specifically, we study the optimal level of abstraction for optical transport networks, which will play a major role in 5G networks, thanks to their capability of providing high capacity in a cost-and energy-efficient way. Several abstraction models for optical transport networks have been recently proposed [8], [9], [10], [11]. In [8], [9] an abstraction model for optical transport networks is presented which offers low blocking probability for connection requests, while guaranteeing high scalability for the control infrastructure.…”

“…Several abstraction models for optical transport networks have been recently proposed [8], [9], [10], [11]. In [8], [9] an abstraction model for optical transport networks is presented which offers low blocking probability for connection requests, while guaranteeing high scalability for the control infrastructure. The authors in [10] propose three abstraction models for optical transport networks and compare them in terms of potential for efficient management of network resources and implementation complexity.…”