Shared path protection through reconstructing sharable bandwidth based on spectrum segmentation for elastic optical networks

2016 ◽  
Vol 32 ◽  
pp. 88-95 ◽  
Author(s):  
Huanlin Liu ◽  
Mingjia Zhang ◽  
Pengfei Yi ◽  
Yong Chen
Keyword(s):  
Optical Networks ◽  
Path Protection ◽  
Shared Path Protection

New Dimensions for Survivable Service Provisioning in Optical Backbone and Access Networks

2011 ◽  
pp. 227-252
Author(s):  
Paolo Monti ◽  
Lena Wosinska ◽  
Cicek Cavdar ◽  
Andrea Fumagalli ◽  
Jiajia Chen
Keyword(s):  
Optical Networks ◽  
Service Providers ◽  
Blocking Probability ◽  
Access Networks ◽  
Service Provisioning ◽  
Protection Scheme ◽  
Path Protection ◽  
Trade Offs ◽  
Set Up ◽  
Shared Path Protection

<div>Originally, networks were engineered to provide only one type of service, i.e. either voice or data, so only one level of resiliency was requested. This trend has changed, and today’s approach in service provisioning is quite different. A Service Level Agreement (SLA) stipulated between users and service providers (or network operators) regulates a series of specific requirements, e.g., connection set-up times and connection availability that has to be met in order to avoid monetary fines. In recent years this has caused a paradigm shift on how to provision these services. From a “one-solution-fits-all” scenario, we witness now a more diversified set of approaches where trade-offs among different network parameters (e.g., level of protection vs. cost and/or level of protection vs. blocking probability) play an important role.</div><div>This chapter aims at presenting a series of network resilient methods that are specifically tailored for a dynamic provisioning with such differentiated requirements. Both optical backbone and access networks are considered. In the chapter a number of provisioning scenarios - each one focusing on a specific Quality of Service (QoS) parameter - are considered. First the effect of delay tolerance, defined as the amount of time a connection request can wait before being set up, on blocking probability is investigated when Shared Path Protection is required. Then the problem of how to assign “just-enough” resources to meet each connection availability requirement is described, and a possible solution via a Shared Path Protection Scheme with Differentiated Reliability is presented. Finally a possible trade off between deployment cost and level of reliability performance in Passive Optical Networks (PONs) is investigated.&nbsp;The presented results highlight the importance of carefully considering each connection’s QoS parameters while devising a resilient provisioning strategy. By doing so the benefits in terms of cost saving and blocking probability improvement becomes relevant, allowing network operators and service providers to maintain satisfied customers at reasonable capital and operational expenditure levels</div>

A parallel cross-connection recovery scheme for dual link failure in elastic optical networks

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Dinesh Kumar ◽  
Rajiv Kumar ◽  
Neeru Sharma
Keyword(s):  
Optical Networks ◽  
High Speed ◽  
Blocking Probability ◽  
Link Failure ◽  
Recovery Strategy ◽  
Intermediate Node ◽  
Path Protection ◽  
Connection Recovery ◽  
Shared Path Protection ◽  
Cross Connection

Abstract In this paper, we proposed a fast recovery strategy for a dual link failure (DLF) in elastic optical network (EON). The EON is a promising solution to meet the next generation higher bandwidth demand. The survivability of high speed network is very crucial. As the network size increases the probability of the DLF and node failure also increases. Here, we proposed a parallel cross connection backup recovery strategy for DLF in the network. The average bandwidth blocking probability (BBP), bandwidth provisioning ratio (BPR), and recovery time (RT) for our proposed Intermediate node cross-connect backup for shared path protection (INCB-SPP) for ARPANET are 0.38, 2.71, 4.68 ms, and for DPP 0.70, 6.02, 8.71 ms and for SPP 0.40, 2.87, and 16.33 ms respectively. The average BBP, BPR, and RT of INCB-SPP for COST239 are 0.01, 1.71, 3.79 ms and for DPP are 0.39, 3.50, 8.20 ms and SPP are 0.04, 1.75, and 12.47 ms respectively. Hence, the proposed strategy shows lower BBP, fast connection recovery, and BPR when compared with the existing shared path protection (SPP) and dedicated path protection (DPP) approaches. Simulation is performed on ARPANET and COST239 topology networks.

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