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Telecommunication services are pervasive in today's human activity and are required to offer reliable and quality-of-service(QoS)-aware guaranteed services. In global path protection, the working path between a source and a destination can be protected by a backup path, which ensures data transfer in the event of a failure that makes the working path to be unavailable. Multipath and disjoint routing...
This article proposes shifting the perspective for the design of resilient networks from cost-focused to one suited for business purposes. Risk engineering is used as a basis to enable us to monetarily express not only the cost of recovery, but also the impact of failures affecting connections (expressed with use of penalties imposed on an operator), and then to find the tradeoff between the cost...
This study is concerned with an original traffic restoration strategy for wide-area communication networks called Elastic Rerouting (ER). ER aims at alleviating the tradeoff between the network cost and traffic restoration complexity observed in existing solutions. We present the strategy, provide a mathematical formulation for the ER related optimization problem, and discuss an approach to its resolution...
Elastic Optical Network (EON) is a promising technology proposed recently to provide flexible and multi-bitrate data transmission in the optical layer. EONs utilize various modulation format conversion and smaller spectrum granularity, what provide more efficient use of spectrum resources comparing to currently used fix-grid WDM networks. Concurrently, growing popularity of network services provided...
In this paper, we focus on a survivable elastic optical network (EON) that supports both unicast and anycast traffic demands. The network implements a dedicated path protection scheme (DPP), in which backup lightpaths are assigned to traffic demands so that to protect against single link failures. In a normal network state, each anycast demand is served by a specific data center (DC). However, we...
Recently, the Content Oriented Networking (CON) has become a recognized approach that is gaining extensive acceptance and deployment. At the same time, Elastic Optical Networks (EONs) are considered as a very promising approach for effective bandwidth allocation in optical networks. In this paper, we consider various approaches to content distribution in EON protected by the Dedicated Path Protection...
The wireless access to any service in different contexts is nowadays taken for granted. However, the dependability requirements are different for various services and contexts. Critical services put high requirement on the service reliability, i.e., the probability of no service interruption should be close to one. Dual homing may be used to increase the service reliability in a multi technology,...
In this paper, we have extended the GeoDivRP geodiverse routing protocol to consider jitter requirements when using multiple geographic paths for telecommunication networks under regional challenges. We have formulated bounded-jitter multipath routing using a multi-commodity flow problem and proposed an integer linear programming formulation to solve it. We have implemented the routing protocol in...
Improving resilience against failures and targeted attacks is an important aspect of network design. The resilience and cost of networks are two opposing objectives in which a designer should consider when building networks. We develop a heuristic algorithm that balances the centrality of networks by adding a set of links that minimizes the variance of graph centrality measures in a least costly fashion...
Communication networks are prone to failures due to targeted attacks or large-scale disasters. Networks can be improved to withstand challenges using mechanisms such as diversity, which can simply be improved by adding links, however achieving maximum resilience is not feasible due to limited budget. Therefore, algorithms that improve the diversity of networks cost-efficiently are necessary. In this...
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