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Emad AISukhni

Bio: Emad AISukhni is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

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DissertationDOI
01 Jan 2011
TL;DR: A number of new distributed protocols and algorithms are presented to solve the challenges of survivable mesh networks and provide new distributed frameworks to support Quality of Service (QoS) differentiation.
Abstract: Motivated by the rapid growth of the internet, the increasing demand and the nature of traffic, wavelength division multiplexing (WDM) is now beginning to expand from a network core technology towards the metropolitan and access networks. However, huge amount of data can be lost and large numbers of users can be disrupted during the times of failure in WDM optical networks. Therefore, a reliable optical layer that can quickly and efficiently respond to failures, such as fiber cuts, is a critical issue to users and service providers. The major challenge in survivable mesh networks is the design of distributed management protocols and resource allocation algorithms that allocate network resources efficiently and are able to quickly recover from a failure. This issue is particularly more challenging in optical networks operating under distributed control, where there is no global information available; and under wavelength continuity constraint, where the same wavelength must be assigned on all links in the selected path. This thesis presents a number of new distributed protocols and algorithms to solve these challenges. The second part of this thesis provides new distributed frameworks to support Quality of Service (QoS) differentiation. These frameworks provide differentiated protection services to meet customers' availability requirements effectively. We describe the availability-analysis for connections with different protection schemes. Through this analysis, we show how connection availability is affected by resource sharing. Based on the availability analysis, the proposed framework provisions each connection in which an appropriate level of protection is provided according to its predefined availability requirement. We consider the networks without wavelength conversion capability as well as dynamic traffic environment. In these distributed frameworks we propose several distributed schemes to provision and manage connections cost-effectively while satisfying the existing and new connections availability requirements. To the memory of my father Mahmoud Alsukhni (Abu Ziad) and to my mother Maryam Nawasreh (Um Ziad)

3 citations


Cited by
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01 Dec 2001
TL;DR: The novel concept of Differentiated Reliability (DiR) is formally introduced in the paper and applied to provide multiple reliability degrees (classes) in the same network layer using a common protection mechanism, i.e., path switching.
Abstract: Current optical networks typically offer two degrees of service reliability: full protection in presence of a single fault in the network, and no protection at all. This situation reflects the historical duality that has its roots in the once divided telephone and data environment. The circuit oriented service required protection, i.e., provisioning of readily available spare resources to replace working resources in case of a fault. The datagram oriented service relied upon restoration, i.e., dynamic search for and reallocation of affected resources via such actions as routing table updates. The current development trend, however, is gradually driving the design of networks towards a unified solution that will jointly support traditional voice and data services as well as a variety of novel multimedia applications. The growing importance of concepts, such Quality of Service (QoS) and Differentiated Services that provide varying levels of service performance in the same network evidences this trend. Consistently with this pattern, the novel concept of Differentiated Reliability (DiR) is formally introduced in the paper and applied to provide multiple reliability degrees (classes) in the same network layer using a common protection mechanism, i.e., path switching. According to the DiR concept, each connection in the layer under consideration is guaranteed a minimum reliability degree, defined as the Maximum Failure Probability allowed for that connection. The reliability degree chosen for a given connection is thus determined by the application requirements, and not by the actual network topology, design constraints, robustness of the network components, and span of the connection. An efficient algorithm is proposed to design the Wavelength Division Multiplexing (WDM) layer of a DiR ring.

39 citations