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In Wavelength Switched Optical Networks (WSONs), sharing of protection wavelengths is an attractive strategy to increase survivability against failures. However, to guarantee an acceptable quality of transmission (QoT), both working and protection paths may need to undergo optical-electrical-optical (OEO) regeneration. With this aim, the placement of a limited number of regenerators is a cost-effective...
Sharing of protection resources is a cost-effective solution to guarantee survivability against failures. In wavelength-switched optical networks (WSON), in addition to sharing the wavelengths resources, wavelength converters (WCs) can also be shared by different optical connections, or lightpaths. This paper considers the problem of ensuring 100% survivability against single-link failures in a GMPLS-enabled...
In order to provide a reliable multicast service on the MPLS Transport Profile ring structure network, this paper proposes two innovative schemes. The proposed multicast service scheme is designed for the multi-ring structure, which enhances the ring structure's applicability and gives more support for the network resilience. The flow-based end-to-end OAM function is operated independently for each...
We propose and evaluate a PCE-based architecture for bidirectional lightpath set up in GMPLS-controlled optical networks. The proposed architecture strongly improves the performance of the distributed architecture with both standard and enhanced signaling schemes.
This tutorial addresses how Carrier Ethernet technologies can be used in the transport network to provide resilience to the packet layer. Carrier Ethernet networks based on PBB-TE and T-MPLS/MPLS-TP are strong candidates for reliable transport of triple-play services. These technologies offer Operation, Administration and Management (OAM) functionalities and support for Quality of Service (QoS), required...
This paper proposes three innovative point-to-multipoint protection schemes to provide efficient and reliable MPLS transport profile multicast services, which is particularly relevant for the fast growing IPTV broadcast service. The three proposed protection schemes are all based on the interconnected rings structure, which is a widely deployed topology of legacy networks and has the natural ability...
This paper exploits wavelength converters in GMPLS-based wavelength switched optical networks to reduce resource contentions during lightpath restoration. Reduction of the restoration blocking is achieved thanks to wavelength conversion and an intelligent wavelength selection strategy.
We prioritize bidirectional connection requests by combining dynamic connection provisioning with off-line optimization. Results show that the proposed approach decreases wavelength-converter usage, thereby allowing operators to reduce blocking-probably under bulk connection assignment or network reconfiguration.
In this paper we propose and evaluate the efficiency of a location-based restoration mechanism in a dynamic multi-domain GMPLS network. We focus on inter-domain link failures and utilize the correlation between the actual position of a failed link along the path with the applied restoration technique. Our results show, that without violating the strong privacy preservation requirements between domains,...
This paper evaluates the efficiency of set of modifications to the border gateway protocol (BGP) which aim at providing flexible traffic engineering (TE) across multiple GMPLS domains. A short overview and analysis of existing proposals for BGP-TE extensions is presented. Based on that, three modifications are proposed for support of multi-domain TE: an end-to-end path-specific TE attribute, a border...
We present a GMPLS-compliant path selection algorithm that supports QoS in multi-domain optical networks. Simulation results show that using TE metrics as the primary path selection criterion is beneficial for networks with long connection durations.
This paper compares two GMPLS schemes for bidirectional lightpath provisioning. The novel scheme based on the label set, where both directions are set up with a backward reservation, is assessed against the standard scheme based on the upstream label, where the reverse path is established with a forward reservation unaware of wavelength availability. Results show that the label set scheme significantly...
In GMPLS optical networks, the label (i.e., wavelength) selection process can be accomplished in a dynamic and distributed way by the RSVP-TE signalling protocol. In wavelength-continuous networks, the concurrent selection of the same label by distinct reservation attempts may lead to a connection blocking. In wavelength- convertible networks, the selection of a distinct label on each link may lead...
The GMPLS assumption that all available labels are equal is reasonable in electronic networks but not always true in WDM optical networks where labels correspond to physical wavelengths. In this paper we present two schemes for collecting the preference for specific labels during GMPLS signaling. For this purpose a new use of the Suggested Label object is proposed, and a novel object called Suggested...
GMPLS architecture specifies signaling protocol extensions, such as the label set, to support dynamic connection setup in the optical domain. However, current extensions do not carry information to minimize converter utilization in wavelength routed optical networks. Converter waste increases the network cost and negatively impacts the blocking probability if the available converters are limited....
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