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As the survivable mapping is critical in IP-over-wavelength-division-multiplexing (WDM) network to guarantee the restorability of IP layer, provisioning survivability in network with dynamic traffic is essential. However, survivable mapping problem for dynamic traffic shows more complexity than that for static traffic: 1) How to guarantee a survivable mapping since the lightpath is established and...
Different routing schemes for multi-layer and multidomain optical networks are analyzed, and a novel routing architecture is described in the paper. Cooperation models between dual routing engine in large-scale multi-layer and multidomain optical networks are researched, and an optimal model is proposed and simulated. Then the scalability of dual routing engine architecture is validated on DRE testbed.
As a key problem in wavelength switched optical networks (WSON) in which wavelengths are the most important resources, routing and wavelength assignment (RWA) problem has been researched extensively. Due to the advantages of path computation in multi-layer and multi-domain networks, especially in multi-constraints scenarios, path computation element (PCE) has been introduced into WSON, which provides...
In this paper, a resource pre-configuration scheme has been introduced into GMPLS-based multi-granularity optical networks. By pre-configuring the resource of multilayer optical networks, the topology can be reconstructed with the number of direct routes increasing, and the performance of routing and forwarding can be optimized. Numerical results of the simulations show the connection establishing...
With the development of large-scale, multi-region and multi-layer networks, policy and constraint-based path computation is more and more complicated and dynamic routing becomes one of the key issues in GMPLS/ASON networks. Then a routing architecture named PCE is proposed to resolve the aforementioned complicated routing problem. However, as the huge bandwidth requirement emerges, capacity of Tbit/s...
The hierarchical routing and wavelength assignment problem in Automatic Switched Optical Network (ASON) is researched. Based on our analysis, three adaptive algorithms called MLLR (Multi-Layer Least Loaded Routing Algorithm), WMLCR (Wavelength-graph-based Multi-Layer Least Congestion Routing Algorithm) and BMR (Backtracking-based Multi-Layer Routing Algorithm) are proposed. A platform named AHORSP...
Transport MPLS (T-MPLS) is regarded as one of the most important transport technologies in the next generation network (NGN). It is a connection-oriented packet transport technology that developed from MPLS techniques and now defined by ITU-T SG13 & SG15. In this paper, we analyze the architecture of the T-MPLS networks. Also the most important building blocks for the modular design of the common...
As most of the carriers have extended their circuit transport networks with packet transport capabilities due to the inefficient transport network architecture, the controlling manner developed silently. Multiple service transport platform is the newly proposed packet based transport technology and the standardization process is very fast. GMPLS is considered to be the future controlling technologies...
This paper designs a PCE-based architecture of routing, and proposes two distributed signaling schemes in PCE-based wavelength switching optical network (WSON). Simulation results based on the topology of Chinese core network are given and analyzed.
The hierarchical routing infrastructure in automatic switched optical network (ASON) is researched. Three operational algorithms MLLR (multi-layer least loaded routing algorithm), MLCR (multi-layer least congestion routing algorithm) and MROB (multi-layer routing algorithm based on backtracking) are proposed. In these algorithms, the resource coordination and balancing of multi-domain and multilayer...
We experimentally investigate impairment aware routing and end-to-end compensation in a WSON testbed. The extended control plane modules for QoT optimization and two compensation control strategies are realized and verified in terms of optical power adaptive adjustment.
The current best-effort Internet is adverse to deliver real media information since it is provided with an uncertain delay property in the traditional routing, flow control and retransmission. The research on the access control mechanism is more significant along with the development of the media applications. In this paper, a multi-path access control scheme on cost in core packet network is proposed...
Wavelength-division multiplexed (WDM) networks using wavelength-routing are considered to be potential candidates for the next generation wide area backbone networks. A node in the network may have both wavelength conversion and splitting capabilities which is called as virtual source. It is assumed that virtual sources are limited in number and are distributed evenly in the network. One virtual source...
The existing metrics to evaluate the advertisement triggers could not judge the trigger's impact on the routing bandwidth requirement. To solve this problem we introduce two new metrics, i.e. average routing update overhead (ARUO) and maximum routing update overhead (MRUO). We re-evaluate the existing triggers using not only blocking probability but also ARUO and MRUO.
In this paper, we propose a novel absolute trigger for wavelength availability advertisement in the optical wavelength-routed networks, i.e. wavelength state difference based trigger (DT). The existing triggers do not consider whether the wavelength availability state is changing from free to busy or from busy to free. But these two kinds of changes do not affect the routing in the same way which...
A novel backward reservation protocol with intermediate retry is proposed for wavelength-continuous lightpaths establishment in wavelength-routed optical networks. The results reveal it improves the success rate in lightpaths setup considerably without much incrementing the setup delay.
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