LSP partial spatial-protection in MPLS over WDM optical networks
IEEE Transactions on Communications
Grooming and protection with availability guarantees in multilayer optical networks
ONDM'09 Proceedings of the 13th international conference on Optical Network Design and Modeling
Algorithms and models for backup reprovisioning in WDM networks
IEEE/ACM Transactions on Networking (TON)
Fast simulation of service availability in mesh networks with dynamic path restoration
IEEE/ACM Transactions on Networking (TON)
Multilayer Protection with Availability Guarantees in Optical WDM Networks
Journal of Network and Systems Management
Trading availability among shared-protected dynamic connections in WDM networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Survivability is a key concern in modern network design in order to achieve fast service restorability against network failures. This paper investigates the problem of survivable dynamic connection provisioning in general telecom backbone networks, which are mesh structured. These networks employ optical fibers, which may fail due to network outages such as fiber cuts, etc. Our study applies to survivability of optical wavelength-division multiplexing (WDM) as well as multi-protocol label switching (MPLS) networks. For survivability study, we assume differentiated services where connections may have different availability requirements, so they may be provisioned differently with protection (if needed) based on their availability requirements and current network state. Therefore, it may be possible that connections with the same source, destination, and availability requirement are provisioned differently (unprotected, shared-path protected, or dedicated-path protected) at different times based on current network state. Such differentiated provisioning can provide diverse levels of service performance and achieve network resource optimization flexibly. Our main contributions are as follows. First, we develop an analytical model to quantify the availabilities of connections with various protection modes, i.e., unprotected, dedicated-path protected, and shared-path protected. Particular emphasis is placed on computing a connection's availability with shared-path protection by employing the link-vector technique, because this technique can maximally explore the sharing potential among backup paths and achieve bandwidth-assignment flexibility. Based on the mathematical model, we then present a novel provisioning strategy for dynamic connection requests in which multiple levels of services are provided and different protection schemes may be applied to different connections. The strategy jointly considers both connection availability satisfaction and resource optimizatio- - n. Numerical results show very good accuracy of our model and high effectiveness of our provisioning strategy