Signaling protocol extensions for converter-saving wavelength assignment in GMPLS optical networks

Wavelength converter placement in optical networks with dynamic traffic

“…Instead, we evaluate a case study where a network operator has deployed a given number of wavelength converters based on the well-known results that WCs can reduce the blocking probability [2][3]. The converters should be located in the network so that good blocking performance is achieved and that the placement is future-proof in terms of scalability and varying traffic demands.…”

“…It contains a Generalized Label Request object, which every node issues to the downstream neighbor to request a label binding. It may include optional objects, such as the Label Set [1], which has been standardized, and the Suggested Vector, which is a novel object presented in [2]. Intermediate nodes along the route process the Path message, creating a proper state for the session in a local database to store the received objects, and forward it to the next hop.…”

“…The Suggested Vector (SV) object has been proposed in [2][3] for this purpose: it includes complete information on the number of required WCs for a specific wavelength selection on all traversed links along the chosen path.…”

Increasing Restorability for Local-to-Egress Restoration in GMPLS Controlled Networks with Limited Wavelength Conversion

“…These contentions can be solved by wavelength conversion, but especially when WCs are limited it is necessary to minimize their use. The SV scheme has shown to minimize WC usage in the provisioning phase [5]. The SV scheme for local-to-egress restoration is shown in Fig.…”

“…When setting up In order to ensure that the use of WCs is minimized during LSP setup, we use a novel signaling extension to the RSVP-TE protocol called Suggested Vector (SV) first proposed in [5]. It is an optional object used together with the label set, which is a standard protocol extension [6].…”