Capacity performance of dynamic provisioning in optical networks

Abstract

This paper describes an architecture and analyzes the performance of dynamic provisioning of lightpaths in an optical network. In dynamic provisioning, a lightpath is set up in real-time without rearranging the working and protection routes of existing lightpaths, and without the knowledge of future lightpath provisioning events. This paper develops a general model of the physical topology of the optical network, and outlines routing approaches for dynamic provisioning of lightpaths. It analyzes via simulations the performance of dynamically provisioned unprotected, 1 + 1 protected and mesh-restored lightpaths. The analysis of the efficiency of network utilization of dynamic provisioning focuses on the spare capacity needed for protection, and in particular focuses on the impact of sharing of wavelength channels for mesh-restored lightpaths. The main conclusion from the performance studies is that significant capacity gains are achieved with sharing of wavelength-channels for mesh-restored lightpaths with dynamic provisioning even for sparse topologies, and even at moderate loads.

Access-Point Allocation Algorithms for Scalable Wireless Internet-Access Mesh Networks

“…To improve the dependability of WIMNET, the AP allocation algorithm should be extended to find an AP allocation such that the APs can be connected even for one link fault or one AP fault occurrence. This dependability can be achieved by allocating redundant APs to provide backup routes (Ramamurthy et al, 2001). At the same time, the number of such APs and the maximum hop count should be minimized for the cost reduction and the performance improvement.…”

Availability design of optical transport networks

“…By definition, a shared risk group (SRG) [24] is a set of network elements that are simultaneously struck by the same failure event. Since nodes have been assumed ideal, the approach presented in this paper could be extended to consider the presence of shared risk link group (SRLG) [25], [26] in the network.…”

Guaranteed Quality of Recovery in WDM Mesh Networks

“…The third virtual path could be unprotected, but in the event of failure, restoration could be performed dynamically. The recent studies [7][8] present different service levels of fault protection for WDM networks. The classification of QoP service of [7] is similar to that of [6]; moreover, the SRLG constraint is considered for fault protection design in the literature.…”

“…The recent studies [7][8] present different service levels of fault protection for WDM networks. The classification of QoP service of [7] is similar to that of [6]; moreover, the SRLG constraint is considered for fault protection design in the literature. In the research of [8], the service class is divided into four levels.…”

“…Some pioneers explore QoP mechanism and classify into either three [6][7] or four [8] service levels. The reliability of service [6] addresses three levels of fault protection for ATM networks.…”